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Bian Y, Chen Y, Zhan L, Guo H, Ke H, Wang Y, Wang Q, Gao Y, Gao Y. Effects of enzyme-induced carbonate precipitation technique on multiple heavy metals immobilization and unconfined compressive strength improvement of contaminated sand. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 947:174409. [PMID: 38960158 DOI: 10.1016/j.scitotenv.2024.174409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2024] [Revised: 06/18/2024] [Accepted: 06/29/2024] [Indexed: 07/05/2024]
Abstract
Enzyme-induced carbonate precipitation (EICP) has been studied in remediation of heavy metal contaminated water or soil in recent years. This paper aims to investigate the immobilization mechanism of Zn2+, Ni2+, and Cr(VI) in contaminated sand, as well as strength enhancement of sand specimens by using EICP method with crude sword bean urease extracts. A series of liquid batch tests and artificially contaminated sand remediation experiments were conducted to explore the heavy metal immobilization efficacy and mechanisms. Results showed that the urea hydrolysis completion efficiency decreased as the Ca2+ concentration increased and the heavy metal immobilization percentage increased with the concentration of Ca2+ and treatment cycles in contaminated sand. After four treatment cycles with 0.5 mol/L Ca2+ added, the immobilization percentage of Zn2+, Ni2+, and Cr(VI) were 99.99 %, 86.38 %, and 75.18 %, respectively. The microscale analysis results presented that carbonate precipitates and metallic oxide such as CaCO3, ZnCO3, NiCO3, Zn(OH)2, and CrO(OH) were generated in liquid batch tests and sand remediation experiments. The SEM-EDS and FTIR results also showed that organic molecules and CaCO3 may adsorb or complex heavy metal ions. Thus, the immobilization mechanism of EICP method with crude sword bean urease can be considered as biomineralization, as well as adsorption and complexation by organic matter and calcium carbonate. The unconfined compressive strength of EICP-treated contaminated sand specimens demonstrated a positive correlation with the increased generation of carbonate precipitates, being up to 306 kPa after four treatment cycles with shear failure mode. Crude sword bean urease with 0.5 mol/L Ca2+ added is recommended to immobilize multiple heavy metal ions and enhance soil strength.
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Affiliation(s)
- Yi Bian
- MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, China
| | - Yanbo Chen
- MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, China; Center for Hypergravity Experiment and Interdisciplinary Research, Zhejiang University, Hangzhou, China.
| | - Liangtong Zhan
- MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, China
| | - Haowen Guo
- Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences (CAS), Guangzhou 510640, PR China
| | - Han Ke
- MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, China
| | - Yuze Wang
- Department of Ocean Science and Engineering, Southern University of Science and Technology, Shenzhen 518055, China
| | - Qingyang Wang
- MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou, China
| | - Yufeng Gao
- Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University, Nanjing, China
| | - Yunqi Gao
- Hebei University, No. 180 Wusi Dong Road, Lian Chi District, Baoding City, Hebei Province, China
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Sun L, Sheng Q, Ge Y, He L, Sheng X. The quorum sensing SinI/R system contributes to cadmium immobilization in Ensifer adhaerens NER9 in the cadmium-contaminated solution. JOURNAL OF HAZARDOUS MATERIALS 2024; 470:134300. [PMID: 38631248 DOI: 10.1016/j.jhazmat.2024.134300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2024] [Revised: 03/19/2024] [Accepted: 04/11/2024] [Indexed: 04/19/2024]
Abstract
In this study, the cadmium (Cd)-tolerant Ensifer adhaerens strain NER9 with quorum sensing (QS) systems (responsible for N-acyl homoserine lactone (AHL) production) was characterized for QS system-mediated Cd immobilization and the underlying mechanisms involved. Whole-genome sequence analysis revealed that strain NER9 contains the QS SinI/R and TraI/R systems. Strains NER9 and the NER9∆sinI/R, NER9∆traI/R, and NER9∆sinI/R-traI/R mutants were constructed and compared for QS SinI/R and TraI/R system-mediated Cd immobilization in the solution and the mechanisms involved. After 24 h of incubation, strain NER9 significantly decreased the Cd concentration in the Cd-contaminated solution compared with the NER9∆sinI/R, NER9∆traI/R, and NER9∆sinI/R-traI/R mutants. The NER9∆sinI/R mutant had a greater impact on Cd immobilization and a lower impact on the activities of AHLs than did the NER9∆traI/R mutant. The NER9∆sinI/R mutant had significantly greater Cd concentrations and lower cell wall- and exopolysaccharide (EPS)-adsorbed Cd contents than did strain NER9. Furthermore, the NER9∆sinI/R mutant presented a decrease in the number of functional groups interacting with Cd, compared with strain NER9. These results suggested that the SinI/R system in strain NER9 contributed to Cd immobilization by mediating cell wall- and EPS-adsorption in Cd-containing solution.
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Affiliation(s)
- Lijing Sun
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Qi Sheng
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Yanyan Ge
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Linyan He
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Xiafang Sheng
- College of Life Sciences, Nanjing Agricultural University, Nanjing 210095, China.
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Elleuch J, Drira M, Ghribi I, Hadjkacem F, Pierre G, Khemakhem H, Michaud P, Fendri I, Abdelkafi S. Lead removal from the aqueous solution by extracellular polymeric substances produced by the marine diatom Navicula salinicola. ENVIRONMENTAL TECHNOLOGY 2024:1-13. [PMID: 38619982 DOI: 10.1080/09593330.2024.2338456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2023] [Accepted: 03/27/2024] [Indexed: 04/17/2024]
Abstract
Microbial extracellular polymeric substances (EPS) have recently emerged as significant contributors in diverse biotechnological applications. Extracellular polymeric substances (EPS), produced by a Navicula salinicola strain, have been studied for potential applications in a specific heavy metal (lead (Pb II)) removal from wastewater. The optimisation of operational parameters, mainly pH, Pb and EPS concentrations, using the Box-Behnken design (BBD) was undertaken to enhance lead uptake. The higher Pb adsorption capacity reached 2211.029 mg/g. Hydroxyl, carbonyl, carboxyl, phosphoric, and sulfhydryl groups were identified quantitatively as potential sites for Pb adsorption. EPS exhibited a notable flocculation rate of 70.20% in kaolin clay at a concentration of 15 mg/L. They demonstrated an emulsifying activity greater than 88%, showcasing their versatile potential for both sedimentation processes and stabilising liquid-liquid systems. EPS could be excellent nonconventional renewable biopolymers for treating water and wastewater.
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Affiliation(s)
- Jihen Elleuch
- Laboratoire de Génie Enzymatique et Microbiologie, Equipe de Biotechnologie des Algues, Ecole Nationale d'Ingénieurs de Sfax, University of Sfax, Sfax, Tunisia
| | - Marwa Drira
- Laboratory of Biotechnology and Plant Improvement, Center of Biotechnology of Sfax, Sfax, Tunisia
| | - Imtinen Ghribi
- Laboratory of Plant Biotechnologies Applied to the Improvement of Plants, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Farah Hadjkacem
- Laboratoire de Génie Enzymatique et Microbiologie, Equipe de Biotechnologie des Algues, Ecole Nationale d'Ingénieurs de Sfax, University of Sfax, Sfax, Tunisia
- CNRS, Clermont Auvergne INP, Institute Pascal, Université Clermont Auvergne, Clermont-Ferrand, France
| | - Guillaume Pierre
- CNRS, Clermont Auvergne INP, Institute Pascal, Université Clermont Auvergne, Clermont-Ferrand, France
- Laboratory of Multifunctional Materials and Applications (LaMMA), (LR16ES18), Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | | | - Philippe Michaud
- CNRS, Clermont Auvergne INP, Institute Pascal, Université Clermont Auvergne, Clermont-Ferrand, France
| | - Imen Fendri
- Laboratory of Plant Biotechnologies Applied to the Improvement of Plants, Faculty of Sciences of Sfax, University of Sfax, Sfax, Tunisia
| | - Slim Abdelkafi
- Laboratoire de Génie Enzymatique et Microbiologie, Equipe de Biotechnologie des Algues, Ecole Nationale d'Ingénieurs de Sfax, University of Sfax, Sfax, Tunisia
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Tang L, Yang J, Liu X, Kang L, Li W, Wang T, Qian T, Li B. Biodegradation of phenanthrene-Cr (VI) co-contamination by Pseudomonas aeruginosa AO-4 and characterization of enhanced degradation of phenanthrene. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 918:170744. [PMID: 38325483 DOI: 10.1016/j.scitotenv.2024.170744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2023] [Revised: 01/09/2024] [Accepted: 02/04/2024] [Indexed: 02/09/2024]
Abstract
Microorganisms capable of simultaneously remediating heavy metals (HMs) and polycyclic aromatic hydrocarbons (PAHs) pollution hold significant importance in bioremediation efforts. In this study, we investigated the ability of Pseudomonas aeruginosa AO-4 to simultaneously degrade phenanthrene (PHE) and reduce Cr (VI). Specifically, it has the ability to reduce 100 % of Cr (VI) (30 mg/L) while degrading 43.8 % of PHE (50 mg/L). In batch experiments, it was observed that the presence of Cr (VI) can enhance the degradation of PHE by strain AO-4. The solubility of PHE in soluble extracellular polymeric substances (S-EPS) was found to be related to the initial concentration of Cr (VI), which could explain why Cr (VI) promotes the degradation of PHE. Additionally, XPS analysis confirmed that Cr (VI) was reduced to Cr (III) with S-EPS produced by Pseudomonas aeruginosa AO-4. GC-MS analysis was conducted to analyze the degradation metabolites of phenanthrene, di(2-ethylhexyl) phthalate and 2TMS derivatives of salicylic acid were detected, indicating that Pseudomonas aeruginosa AO-4 is capable of degrading phenanthrene through two distinct pathways. These findings demonstrate the potential of Pseudomonas aeruginosa AO-4 in the treatment of co-contamination scenarios involving PAHs and HMs.
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Affiliation(s)
- Liuyuan Tang
- College of Environmental Science and Engineering, Taiyuan University of Technology, Shanxi Key Laboratory of Earth Surface Processes and Resource Ecological Security in Fenhe River Basin, Shanxi Engineering Research Center of Low Carbon Remediation for Water and Soil Pollution in Yellow River Basin, Jinzhong 030600, China
| | - Jing Yang
- Shanxi Transportation Holding Ecological Environment Co., Ltd, Shanxi 030000, China
| | - Xiaona Liu
- College of Environmental Science and Engineering, Taiyuan University of Technology, Shanxi Key Laboratory of Earth Surface Processes and Resource Ecological Security in Fenhe River Basin, Shanxi Engineering Research Center of Low Carbon Remediation for Water and Soil Pollution in Yellow River Basin, Jinzhong 030600, China
| | - Lingke Kang
- College of Environmental Science and Engineering, Taiyuan University of Technology, Shanxi Key Laboratory of Earth Surface Processes and Resource Ecological Security in Fenhe River Basin, Shanxi Engineering Research Center of Low Carbon Remediation for Water and Soil Pollution in Yellow River Basin, Jinzhong 030600, China
| | - Wenjun Li
- Shanxi Transportation Holding Ecological Environment Co., Ltd, Shanxi 030000, China
| | - Ting Wang
- School of Environment and Resources, Taiyuan University of Science and Technology, Taiyuan, Shanxi 030024, China
| | - Tianwei Qian
- College of Environmental Science and Engineering, Taiyuan University of Technology, Shanxi Key Laboratory of Earth Surface Processes and Resource Ecological Security in Fenhe River Basin, Shanxi Engineering Research Center of Low Carbon Remediation for Water and Soil Pollution in Yellow River Basin, Jinzhong 030600, China.
| | - Bo Li
- College of Environmental Science and Engineering, Taiyuan University of Technology, Shanxi Key Laboratory of Earth Surface Processes and Resource Ecological Security in Fenhe River Basin, Shanxi Engineering Research Center of Low Carbon Remediation for Water and Soil Pollution in Yellow River Basin, Jinzhong 030600, China.
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Priyadarshanee M, Das S. Spectra metrology for interaction of heavy metals with extracellular polymeric substances (EPS) of Pseudomonas aeruginosa OMCS-1 reveals static quenching and complexation dynamics of EPS with heavy metals. JOURNAL OF HAZARDOUS MATERIALS 2024; 466:133617. [PMID: 38306836 DOI: 10.1016/j.jhazmat.2024.133617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 01/08/2024] [Accepted: 01/23/2024] [Indexed: 02/04/2024]
Abstract
The adsorption behavior and interaction mechanisms of extracellular polymeric substances (EPS) of Pseudomonas aeruginosa OMCS-1 towards chromium (Cr), lead (Pb), and cadmium (Cd) were investigated. EPS-covered (EPS-C) cells exhibited significantly higher (p < 0.0001; two-way ANOVA) removal of Cr (85.58 ± 0.39%), Pb (81.98 ± 1.02%), and Cd (73.88 ± 1%) than EPS-removed (EPS-R) cells. Interactions between EPS-heavy metals were spontaneous (ΔG<0). EPS-Cr(VI) and EPS-Pb(II) binding were exothermic (ΔH<0), while EPS-Cd(II) binding was endothermic (ΔH>0) process. EPS bonded to Pb(II) via inner-sphere complexation by displacement of surrounding water molecules, while EPS-Cr(VI) and EPS-Cd(II) binding occurred through outer-sphere complexation via electrostatic interactions. Increased zeta potential of Cr (29.75%), Pb (41.46%), and Cd (46.83%) treated EPS and unchanged crystallinity (CIXRD=0.13), inferred EPS-metal binding via both electrostatic interactions and complexation mechanism. EPS-metal interaction was predominantly promoted through hydroxyl, amide, carboxyl, and phosphate groups. Metal adsorption deviated EPS protein secondary structures. Strong static quenching mechanism between tryptophan protein-like substances in EPS and heavy metals was evidenced. EPS sequestered heavy metals via complexation with C-O, C-OH, CO/O-C-O, and NH/NH2 groups and ion exchange with -COOH group. This study unveils the fate of Cr, Pb, and Cd on EPS surface and provides insight into the interactions among EPS and metal ions for metal sequestration.
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Affiliation(s)
- Monika Priyadarshanee
- Laboratory of Environmental Microbiology and Ecology (LEnME), Department of Life Science, National Institute of Technology, Rourkela 769 008, Odisha, India
| | - Surajit Das
- Laboratory of Environmental Microbiology and Ecology (LEnME), Department of Life Science, National Institute of Technology, Rourkela 769 008, Odisha, India.
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Chauhan PK, Upadhyay SK. Mixed Consortium of Salt-Tolerant Phosphate Solubilizing Bacteria Improves Maize (Zea mays) Plant Growth and Soil Health Under Saline Conditions. Mol Biotechnol 2024; 66:489-499. [PMID: 37243838 DOI: 10.1007/s12033-023-00771-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2023] [Accepted: 05/10/2023] [Indexed: 05/29/2023]
Abstract
The rhizobacterial isolate SP-167 exhibited considerable phosphate solubilization, IAA production, exo-polysaccharides, proline, APX, and CAT at a concentration of 6% NaCl (w/v). 16S rDNA sequencing and BLAST analysis showed that isolate SP-167 was Klebsiella sp. In this study, T2 and T8 consortium was developed on the basis of the compatibility of isolate SP-167 with Kluyvera sp. and Enterobacter sp. At 6% NaCl (w/v) concentration, T2 and T8 showed increased PGP properties such as phosphate solubilization, IAA, Proline activity, CAT, POD, and EPS than isolate SP-167. The maximum increase in shoot length was recorded in T2-treated maize plants as compared to the control after 60 days in 1% NaCl stress. The N, P, and K content of leaves were significantly increased in maize plants with the inoculation of both the T2 and T8 consortium. The electrical conductivity of soil was decreased significantly in the T2 inoculated 1% NaCl (w/v) treated pot after 30, 60, and 90 days. In this study, soil enzymes DHA and PPO were significantly increased in both T2 and T8 treated combinations. The Na concentration in root and shoot were significantly decreased in T8 inoculated plant than in T2, as confirmed by the translocation factor study.
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Affiliation(s)
- Prabhat K Chauhan
- Department of Environmental Science, V.B.S. Purvanchal University, Jaunpur, 222003, India
| | - Sudhir K Upadhyay
- Department of Environmental Science, V.B.S. Purvanchal University, Jaunpur, 222003, India.
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Munir Ahamed J, Dahms HU, Huang YL. Heavy metal tolerance, and metal biosorption by exopolysaccharides produced by bacterial strains isolated from marine hydrothermal vents. CHEMOSPHERE 2024; 351:141170. [PMID: 38219989 DOI: 10.1016/j.chemosphere.2024.141170] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/09/2023] [Revised: 12/14/2023] [Accepted: 01/08/2024] [Indexed: 01/16/2024]
Abstract
The present study highlights heavy metal tolerance, EPS production, and biosorption capacity of four hydrothermal vent bacterial strains, namely Exiguobacterium aquaticum, Mammaliicoccus sciuri, Micrococcus luteus, and Jeotgalicoccus huakuii against As, Cd, Cr, Cu, Co, Pb and Ni. The biosorption assay showed high removal efficiency of As (83%) by E. aquaticum, Cd (95%) by M. sciuri, Cu (94%) by M. luteus, and Ni (89%) by J. huakuii and their produced EPS with these metals in aqueous solution were 84%, 85%, 98%, and 91%, respectively. The maximum EPS yield was attained by optimized medium composition consisting of 1% Xylose, and 1% NaCl at pH 7. In metal-amended conditions, the four bacterial strains showed induced EPS production in the initial concentrations. SEM with EDX and CLSM images showed that the growth and EPS production of bacterial strains were affected by metal ion concentrations. A phenol sulphuric acid method and BCA assay were used to identify both the carbohydrate and total protein content of four extracted EPS. A DPPH assay revealed that EPS influences free radical scavenging and has a highly enhanced synergistic effect with its antioxidant activity. FT-IR analysis of four extracted EPS showed the shifting of peaks in the functional groups of EPS before and after adsorption of metal ions. At pH 5 and after 60 min contact time metal removal efficiency and adsorption capacity increased as calculated for As, Cd, Cu, and Ni by four extracted EPS: (86%, 20 mg/g), (74%, 19 mg/g), (94%, 60 mg/g) and (89%, 32 mg/g) and (89%, 16 mg/g), (85%, 16 mg/g), (96%, 22 mg/g) and (91%, 16 mg/g), respectively. The Langmuir compared to the Freundlich model was found to better represent the adsorption by EPS providing maximum adsorption capacities for As (34.65 mg/g), Cd (52.88 mg/g), Cu (24.91 mg/g), and Ni (58.38 mg/g).
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Affiliation(s)
- Johnthini Munir Ahamed
- Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan
| | - Hans-Uwe Dahms
- Department of Biomedical Science and Environmental Biology, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Marine Biotechnology and Resources, National Sun Yat-Sen University, Kaohsiung, Taiwan; Research Center for Precision Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Environmental Science and Engineering, National Pingtung University of Science and Technology, Pingtung, Taiwan.
| | - Yeou Lih Huang
- Department of Medical Laboratory Science and Biotechnology, Kaohsiung Medical University, Kaohsiung, Taiwan; Research Center for Precision Environmental Medicine, Kaohsiung Medical University, Kaohsiung, Taiwan; Department of Laboratory Medicine, Kaohsiung Medical University Hospital, Kaohsiung Medical University, Kaohsiung, Taiwan; College of Professional Studies, National Pingtung University of Science and Technology, Pingtung, Taiwan; Department of Chemistry, National Sun Yat-Sen University, Kaohsiung, Taiwan.
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Momin SC, Pradhan RB, Nath J, Lalmuanzeli R, Kar A, Mehta SK. Metal sequestration by Microcystis extracellular polymers: a promising path to greener water treatment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:11192-11213. [PMID: 38217816 DOI: 10.1007/s11356-023-31755-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Accepted: 12/23/2023] [Indexed: 01/15/2024]
Abstract
The problem of heavy metal pollution in water bodies poses a significant threat to both the environment and human health, as these toxic substances can persist in aquatic ecosystems and accumulate in the food chain. This study investigates the promising potential of using Microcystis aeruginosa extracellular polymeric substances (EPS) as an environmentally friendly, highly efficient solution for capturing copper (Cu2+) and nickel (Ni2+) ions in water treatment, emphasizing their exceptional ability to promote green technology in heavy metal sequestration. We quantified saccharides, proteins, and amino acids in M. aeruginosa biomass and isolated EPS, highlighting their metal-chelating capabilities. Saccharide content was 36.5 mg g-1 in biomass and 21.4 mg g-1 in EPS, emphasizing their metal-binding ability. Proteins and amino acids were also prevalent, particularly in EPS. Scanning electron microscopy (SEM) revealed intricate 3D EPS structures, with pronounced porosity and branching configurations enhancing metal sorption. Elemental composition via energy dispersive X-ray analysis (EDAX) identified essential elements in both biomass and EPS. Fourier transform infrared (FTIR) spectroscopy unveiled molecular changes after metal treatment, indicating various binding mechanisms, including oxygen atom coordination, π-electron interactions, and electrostatic forces. Kinetic studies showed EPS expedited and enhanced Cu2+ and Ni2+ sorption compared to biomass. Thermodynamic analysis confirmed exothermic, spontaneous sorption. Equilibrium biosorption studies displayed strong binding and competitive interactions in binary metal systems. Importantly, EPS exhibited impressive maximum sorption capacities of 44.81 mg g-1 for Ni2+ and 37.06 mg g-1 for Cu2+. These findings underscore the potential of Microcystis EPS as a highly efficient sorbent for heavy metal removal in water treatment, with significant implications for environmental remediation and sustainable water purification.
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Affiliation(s)
- Sengjrang Ch Momin
- Laboratory of Algal Physiology and Biochemistry, Department of Botany, Mizoram University, Aizawl, 796004, India
| | - Ran Bahadur Pradhan
- Laboratory of Algal Physiology and Biochemistry, Department of Botany, Mizoram University, Aizawl, 796004, India
| | - Jyotishma Nath
- Laboratory of Algal Physiology and Biochemistry, Department of Botany, Mizoram University, Aizawl, 796004, India
| | - Ruthi Lalmuanzeli
- Laboratory of Algal Physiology and Biochemistry, Department of Botany, Mizoram University, Aizawl, 796004, India
| | - Agniv Kar
- Laboratory of Algal Physiology and Biochemistry, Department of Botany, Mizoram University, Aizawl, 796004, India
| | - Surya Kant Mehta
- Laboratory of Algal Physiology and Biochemistry, Department of Botany, Mizoram University, Aizawl, 796004, India.
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Li T, Du D, Li C, Zhao J, Guo L, Wang X, Zhao J, Xiang W. Investigation on Cr(VI)-bioreduction mechanism and reduction products by a novel Microbacterium sp. strain NEAU-W11. CHEMOSPHERE 2023; 343:140232. [PMID: 37734508 DOI: 10.1016/j.chemosphere.2023.140232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2023] [Revised: 08/12/2023] [Accepted: 09/18/2023] [Indexed: 09/23/2023]
Abstract
Cr(VI) widely exists in the environment and has highly toxic, carcinogenic and mutagenic effects on all organisms. Physical/chemical methods to remove chromium pollution are economically expensive and have disadvantages like high reagent consumption, energy requirements and so on, while bioremediation is an eco-friendly, simple and cost-effective way. In this study, a novel Cr(VI)-reducing strain, Microbacterium sp. NEAU-W11, was reported, and its reduction mechanism was investigated. Microbacterium sp. NEAU-W11 could effectively degrade Cr(VI) under the conditions of pH 7-10, 15-35 °C, and the coexistence of metal pollutants such as Pb and Ni, etc. In addition, both Fe3+ and Cu2+ could improve the reducing ability of strain NEAU-W11, and glucose and lactose as electron donors also had promoting effect. Heat treatment of resting cells confirmed that chromium removal was not biological sorption but biological reduction. The active reductase of strain NEAU-W11 to chromium(VI) mainly existed in the cell cytoplasm, which is the first report in the genus Microbacterium. Micro-characterization of strain NEAU-W11 and the reduction products identified the reduction products as Cr(III)-ligand complexes bound to extracellular polymeric substances (EPS). Collectively, this study systematically investigated the degradation mechanism of Microbacterium sp. NEAU-W11 and the distribution of degradation product Cr(III), providing a new reduction mechanism for the genus Microbacterium, providing a new perspective for a comprehensive understanding of the degradation and transport of chromium by bacteria, and providing theoretical reference for the migration of metal ions in environmental governance.
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Affiliation(s)
- Tingting Li
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China
| | - Dandan Du
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China
| | - Chenxu Li
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China
| | - Junlei Zhao
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China
| | - Lifeng Guo
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China
| | - Xiangjing Wang
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China
| | - Junwei Zhao
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China.
| | - Wensheng Xiang
- Key Laboratory of Agricultural Microbiology of Heilongjiang Province, Northeast Agricultural University, No. 59 Mucai Street, Xiangfang District, Harbin, 150030, People's Republic of China; State Key Laboratory for Biology of Plant Diseases and Insect Pests, Institute of Plant Protection, Chinese Academy of Agricultural Sciences, Beijing, People's Republic of China.
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Varshney S, Bhattacharya A, Gupta A. Halo-alkaliphilic microbes as an effective tool for heavy metal pollution abatement and resource recovery: challenges and future prospects. 3 Biotech 2023; 13:400. [PMID: 37982082 PMCID: PMC10651602 DOI: 10.1007/s13205-023-03807-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2023] [Accepted: 10/10/2023] [Indexed: 11/21/2023] Open
Abstract
The current study presents an overview of heavy metals bioremediation from halo-alkaline conditions by using extremophilic microorganisms. Heavy metal remediation from the extreme environment with high pH and elevated salt concentration is a challenge as mesophilic microorganisms are unable to thrive under these polyextremophilic conditions. Thus, for effective bioremediation of extreme systems, specialized microbes (extremophiles) are projected as potential bioremediating agents, that not only thrive under such extreme conditions but are also capable of remediating heavy metals from these environments. The physiological versatility of extremophiles especially halophiles and alkaliphiles and their enzymes (extremozymes) could conveniently be harnessed to remediate and detoxify heavy metals from the high alkaline saline environment. Bibliometric analysis has shown that research in this direction has found pace in recent years and thus this review is a timely attempt to highlight the importance of halo-alkaliphiles for effective contaminant removal in extreme conditions. Also, this review systematically presents insights on adaptive measures utilized by extremophiles to cope with harsh environments and outlines the role of extremophilic microbes in industrial wastewater treatment and recovery of metals from waste with relevant examples. Further, the major challenges and way forward for the effective applicability of halo-alkaliphilic microbes in heavy metals bioremediation from extremophilic conditions are also highlighted.
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Affiliation(s)
- Shipra Varshney
- University School of Environment Management, Guru Gobind Singh Indraprastha University, Sector-16C, Dwarka, New Delhi, 110078 India
| | - Amrik Bhattacharya
- Enzyme and Microbial Biochemistry Lab, Department of Chemistry, Indian Institute of Technology Delhi, Hauz-Khas, New Delhi, 110016 India
- Amity Institute of Environmental Sciences, Amity University, Noida, Uttar Pradesh 201313 India
| | - Anshu Gupta
- University School of Environment Management, Guru Gobind Singh Indraprastha University, Sector-16C, Dwarka, New Delhi, 110078 India
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11
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Al-Qahtani KM, Abd Elkarim MS, Al-Fawzan FF, Al-Afify ADG, Ali MHH. Biosorption of hexavalent chromium and molybdenum ions using extremophilic cyanobacterial mats: efficiency, isothermal, and kinetic studies. INTERNATIONAL JOURNAL OF PHYTOREMEDIATION 2023; 26:228-240. [PMID: 37431240 DOI: 10.1080/15226514.2023.2232878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/12/2023]
Abstract
Two extremophilic cyanobacterial-bacterial consortiums naturally grow in extreme habitats of high temperature and hypersaline were used to remediate hexavalent chromium and molybdenum ions. Extremophilic cyanobacterial-bacterial biomasses were collected from Zeiton and Aghormi Lakes in the Western Desert, Egypt, and were applied as novel and promising natural adsorbents for hexavalent chromium and molybdenum. Some physical characterizations of biosorbent surfaces were described using scanning electron microscope, energy-dispersive X-ray spectroscopy, Fourier transformation infrared spectroscopy, and surface area measure. The maximum removal efficiencies of both biosorbents were 15.62-22.72 mg/g for Cr(VI) and 42.15-46.29 mg/g for Mo(VI) at optimum conditions of pH 5, adsorbent biomass of 2.5-3.0 g/L, and 150 min contact time. Langmuir and Freundlich adsorption models were better fit for Cr(VI), whereas Langmuir model was better fit than the Freundlich model for Mo(VI) biosorption. The kinetic results revealed that the adsorption reaction obeyed the pseudo-second-order model confirming a chemisorption interaction between microbial films and the adsorbed metals. Zeiton biomass exhibited a relatively higher affinity for removing Cr(VI) than Aghormi biomass but a lower affinity for Mo(VI) removal. The results showed that these extremophiles are novel and promising candidates for toxic metal remediation.
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Affiliation(s)
- Khairia M Al-Qahtani
- Chemistry Department, Faculty of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Mohamad S Abd Elkarim
- Hydrobiology Department, National Institute of Oceanography & Fisheries, Cairo, Egypt
| | - Foziah F Al-Fawzan
- Chemistry Department, Faculty of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Afify D G Al-Afify
- Chemistry Department, National Institute of Oceanography & Fisheries, Cairo, Egypt
| | - Mohamed H H Ali
- Chemistry Department, National Institute of Oceanography & Fisheries, Cairo, Egypt
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12
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Zhou K, Zhou Y, Zhou H, Cheng H, Xu G. Kinetic process of the biosorption of Cu(II), Ni(II) and Cr(VI) by waste Pichia pastoris cells. ENVIRONMENTAL TECHNOLOGY 2023; 44:1730-1750. [PMID: 34842065 DOI: 10.1080/09593330.2021.2012266] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Accepted: 11/19/2021] [Indexed: 06/13/2023]
Abstract
Waste biomass of Pichia pastoris (P.pastoris) cells from the fermentation industry is an environmentally friendly biosorption material. The present study aimed to explore the biosorption behaviour of waste P.pastoris cells for Cu(II), Ni(II) and Cr(VI) in aqueous solution conditions. The results showed that the adsorption kinetics of three kinds of metals were well-fitted with lineared Elovich, pseudo-second-order kinetics models, non-linear kinetics and adsorption isotherms. The effective biosorption rates for Cu(II), Ni(II) and Cr(VI) removal were 71.3%, 59.7% and 16.25% respectively. The maximum Cu(II) adsorption capacity of waste P.pastoris was 40 mg/g at pH = 4 and 225 mg/L of solute concentration for 0.4 g biomass, better than that of the living yeasts. The pattern of Fourier transform infrared (FTIR) indicated that functional groups such as -NH, -OH, Si-O, P-O-C were involved in Cu(II) adsorption process. The analysis of SEM-EDS, XRD and TEM-EDS can be concluded that Cu(II) occupied Ca(II) binding sites by ion exchange mechanism to remove flocculation, and Cu(II) adsorbed onto the diatomite containing in the industrial waste P.pastoris. Thus the adsorption mechanism of the industrial waste P.pastoris was proposed taking Cu(II) as the example. And consecutive biosorption/desorption cycles were used for the evaluation of the regeneration efficiency, suggesting the good regeneration and reusability of waste P.pastoris.
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Affiliation(s)
- Kaiyan Zhou
- School of Minerals Processing and Bioengineering, Central South University, Changsha, People's Republic of China
| | - Yulu Zhou
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, People's Republic of China
| | - Hongbo Zhou
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, People's Republic of China
| | - Haina Cheng
- Key Laboratory of Biometallurgy of Ministry of Education, Central South University, Changsha, People's Republic of China
| | - Gang Xu
- Hunan Flag Bio-Tech Co., Ltd., Changsha, People's Republic of China
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13
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Sun Y, Jin J, Li W, Zhang S, Wang F. Hexavalent chromium removal by a resistant strain Bacillus cereus ZY-2009. ENVIRONMENTAL TECHNOLOGY 2023; 44:1926-1935. [PMID: 34882507 DOI: 10.1080/09593330.2021.2016994] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Accepted: 12/03/2021] [Indexed: 05/25/2023]
Abstract
Bioreduction of Cr(VI) to Cr(III) by reducing microbes has attracted increasing concern. Here, Cr(VI) removal capacity of a Cr(VI)-resistant bacterium isolated from activated sludge was investigated. Based on its physio-biochemical attributes and 16S rDNA sequence analysis, the strain was identified as Bacillus cereus ZY-2009. It grew normally in the media containing 10-100 mg/L Cr(VI), indicating its high resistance to Cr(VI). Under the optimal conditions of pH 7.0, inoculation amount 10%, and temperature 30°C, Cr(VI) was effectively removed, with a removal rate of ∼80%. Co-existing Fe3+ and Cu2+ greatly increased Cr(VI) removal, but Cd2+ showed significant inhibition. Cr(VI) was removed mainly via enzyme-mediated bioreduction but not biosorption. Cr(VI) was reduced by different cell fractions (i.e. extracellular secretions, cytoplasm, and cell envelope), implying that Cr(VI) can be reduced both extracellularly and intracellularly. This strain can be used in the bioremediation of Cr(VI)-containing wastewater, with Fe3+ and Cu2+ as stimulators.
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Affiliation(s)
- Yuhuan Sun
- College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, People's Republic of China
| | - Jianyong Jin
- College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, People's Republic of China
| | - Wenguang Li
- College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, People's Republic of China
| | - Shuwu Zhang
- College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, People's Republic of China
| | - Fayuan Wang
- College of Environment and Safety Engineering, Qingdao University of Science and Technology, Qingdao, People's Republic of China
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Aththanayake AMKCB, Rathnayake IVN, Deeyamulla MP, Megharaj M. Staphylococcus edaphicus KCB02A11 incorporated with natural adsorbents: first report on its tolerance and removal of hexavalent chromium [Cr(VI)]. World J Microbiol Biotechnol 2023; 39:173. [PMID: 37115249 DOI: 10.1007/s11274-023-03614-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Accepted: 04/10/2023] [Indexed: 04/29/2023]
Abstract
Deteriorating the quality of different parts of the ecosystem due to toxic metals is a serious global issue. Hexavalent chromium is a metal that can cause adverse effects on all living beings, including plants, animals, and microorganisms, on exposure to high concentrations for prolonged periods. Removing hexavalent chromium from various types of wastes is challenging; hence the present study investigated the use of bacteria incorporated with selected natural substrates in removing hexavalent chromium from water. Isolated Staphylococcus edaphicus KCB02A11 has shown higher removal efficiency with a wide hexavalent chromium range (0.025-8.5 mg/L) within 96 h. Incorporating the isolated strain with natural substrates commonly found in the environment (hay and wood husk) showed high removal potential [100% removal with 8.5 mg/L of Cr(VI)], even within less than 72 h, with the formation of biofilms on the used substrates applied for metal removal on a large scale for prolonged periods. This study is the first report investigating hexavalent chromium tolerance and removal by Staphylococcus edaphicus KCB02A11.
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Affiliation(s)
- A M K C B Aththanayake
- Department of Microbiology, Faculty of Science, University of Kelaniya, Kelaniya, 11600, Sri Lanka
| | - I V N Rathnayake
- Department of Microbiology, Faculty of Science, University of Kelaniya, Kelaniya, 11600, Sri Lanka.
| | - M P Deeyamulla
- Department of Chemistry, Faculty of Science, University of Kelaniya, Kelaniya, 11600, Sri Lanka
| | - Mallavarapu Megharaj
- Global Centre for Environmental Remediation (GCER), College of Engineering, Science and Environment, The University of Newcastle, University Drive, ATC Building, Callaghan, NSW, 2308, Australia
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15
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Sun X, Feng H, Luo J, Lin L, Zhang H, Duan Y, Liu F, Zhang K, Wang B, Li D, Hu Y, Zhu Z. A novel N-arachidonoyl-l-alanine-catabolizing strain of Serratia marcescens for the bioremediation of Cd and Cr co-contamination. ENVIRONMENTAL RESEARCH 2023; 222:115376. [PMID: 36736755 DOI: 10.1016/j.envres.2023.115376] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 01/03/2023] [Accepted: 01/25/2023] [Indexed: 06/18/2023]
Abstract
Cadmium (Cd) and chromium (Cr) are widespread contaminants with a high risk to the environment and humans. Herein we isolated a novel strain of Serratia marcescens, namely strain S27, from soil co-contaminated with Cd and Cr. This strain showed strong resistance to Cd as well as Cr. S27 cells demonstrated Cd adsorption rate of 45.8% and Cr reduction capacity of 84.4% under optimal growth conditions (i.e., 30 °C, 200 rpm, and pH 7.5). Microscopic characterization of S27 cells revealed the importance of the functional groups C-O-C, C-H-O, C-C, C-H, and -OH, and also indicated that Cr reduction occurred on bacterial cell membrane. Cd(II) and Cr(VI) bioaccumulation on S27 cell surface was mainly in the form of Cd(OH)2 and Cr2O3, respectively. Further, metabolomic analyses revealed that N-arachidonoyl-l-alanine was the key metabolite that promoted Cd and Cr complexation by S27; it primarily promotes γ-linolenic acid (GLA) metabolism, producing siderophores and coordinating with organic acids to enhance metal bioavailability. To summarize, our results suggest that S27 is promising for the bioremediation of environments contaminated with Cd and Cr in tropical regions.
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Affiliation(s)
- Xiaoyan Sun
- College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Huiping Feng
- College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Jialiang Luo
- College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Li Lin
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences, Nanning, 53007, China
| | - Haixiang Zhang
- College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Yali Duan
- College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Fan Liu
- College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Kailu Zhang
- College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Baijie Wang
- College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Dong Li
- Key Laboratory of Agro-Forestry Environmental Processes and Ecological, Regulation of Hainan Province/Center for Eco-Environmental Restoration, Engineering of Hainan Province/School of Ecology & Environment/State Key, Laboratory of Marine Resource Utilization in South China Sea/Key Laboratory for Environmental Toxicology of Haikou, Hainan University, Haikou, Hainan, 570228, China.
| | - Yueming Hu
- College of Tropical Crops, Hainan University, Haikou, 570228, China
| | - Zhiqiang Zhu
- College of Tropical Crops, Hainan University, Haikou, 570228, China.
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Devale A, Sawant R, Pardesi K, Perveen K, Khanam MNI, Shouche Y, Mujumdar S. Production and characterization of bioemulsifier by Parapedobacter indicus. Front Microbiol 2023; 14:1111135. [PMID: 36876100 PMCID: PMC9978354 DOI: 10.3389/fmicb.2023.1111135] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Accepted: 01/09/2023] [Indexed: 02/18/2023] Open
Abstract
The current study evaluated Parapedobacter indicus MCC 2546 for its potential to produce a bioemulsifier (BE). Screening methods performed for BE production by P. indicus MCC 2546 showed good lipase activity, positive drop collapse test, and oil-spreading activity. Furthermore, it showed maximum emulsification activity (225 EU/ml) and emulsification index (E24 50%) at 37°C in Luria Bertani broth at 72 h with olive oil as a substrate. The optimal pH and NaCl concentration for maximum emulsification activity were 7 and 1%, respectively. P. indicus MCC 2546 lowered the surface tension of the culture medium from 59.65 to 50.42 ± 0.78 mN/m. BE produced was composed of 70% protein and 30% carbohydrate, which showed the protein-polysaccharide nature of the BE. Furthermore, Fourier transform infrared spectroscopy analysis confirmed the same. P. indicus MCC 2546 showed a catecholate type of siderophore production. This is the first report on BE and siderophore production by the genus Parapedobacter.
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Affiliation(s)
- Anushka Devale
- Department of Microbiology, P.E.S. Modern College of Arts, Science and Commerce (Autonomous), Pune, India
| | - Rupali Sawant
- Department of Microbiology, P.E.S. Modern College of Arts, Science and Commerce (Autonomous), Pune, India
| | - Karishma Pardesi
- Department of Microbiology, Savitribai Phule Pune University, Pune, India
| | - Kahkashan Perveen
- Department of Botany and Microbiology, College of Science, King Saud University, Riyadh, Saudi Arabia
| | - Mehrun NIsha Khanam
- School of Biological Sciences, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea
| | - Yogesh Shouche
- School of Arts and Sciences, Azim Premji University, Bengaluru, India
| | - Shilpa Mujumdar
- Department of Microbiology, P.E.S. Modern College of Arts, Science and Commerce (Autonomous), Pune, India
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Kalsoom A, Jamil N, Hassan SMU, Khan JA, Batool R. Chromate Removal by Enterobacter cloacae Strain UT25 from Tannery Effluent and Its Potential Role in Cr (VI) Remediation. Curr Microbiol 2023; 80:99. [PMID: 36745203 DOI: 10.1007/s00284-023-03194-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Accepted: 01/13/2023] [Indexed: 02/07/2023]
Abstract
An indigenous chromate-resistant bacterial strain isolated from tannery effluent was identified based on morphological, biochemical, and 16S rRNA gene sequencing, as Enterobacter cloacae UT25. It was found to resist heavy metal ions such as Cr (VI), Pb (II), Cu (II), Co (II), Ni (II), Hg (II), and Zn (II) and antibiotics. The strain was able to remove 89 and 86% chromate, after 24 h of incubation in a Luria-Bertani (LB) medium at an initial Cr (VI) concentration of 1000 and 1500 µg/ml, respectively. Minimum inhibitory concentration (MIC) was observed for chromate to be 80,000 and 1850 µg/ml, after 48 h of incubation in LB and acetate minimal media (AMM), respectively. Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) analysis showed discrete cells with intact and smooth cell walls and homogenous cytoplasm in the absence of metal stress, whereas chromate stress caused cell lysis and reduction in size, which was a characteristic response to Cr (VI) toxicity. Energy Dispersive X-Ray Spectroscopy (EDX) confirmed the adsorption of oxyanions to the cell wall which was one of the Cr (VI) removal mechanisms by the bacterium. Atomic Force Microscopy (AFM) micrographs of chromate-untreated and treated cells revealed Root Mean Square roughness (Rq) values of 16.25 and 11.26 nm, respectively, indicating less roughness in the presence of stress. The partial gene sequence of class 1 integrons (intI1) of strain UT25 showed 94% homology with intI1 gene of strain Enterobacter hormaechei strain ECC59 plasmid pECC59-1. The present analysis highlighted the potential of E. cloacae UT25 as a promissory bacterium that could be applied in removing chromate from polluted environments.
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Affiliation(s)
- Asma Kalsoom
- Institute of Microbiology and Molecular Genetics, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan
| | - Nazia Jamil
- Institute of Microbiology and Molecular Genetics, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan
| | | | - Junaid Ahmed Khan
- Pakistan Institute of Engineering and Applied Sciences (PIEAS), Islamabad, Pakistan
| | - Rida Batool
- Institute of Microbiology and Molecular Genetics, University of the Punjab, Quaid-e-Azam Campus, Lahore, 54590, Pakistan.
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18
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Chauhan PK, Upadhyay SK. Exo-polysaccharide producing bacteria can induce maize plant growth and soil health under saline conditions. Biotechnol Genet Eng Rev 2023:1-20. [PMID: 36597411 DOI: 10.1080/02648725.2022.2163812] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Accepted: 12/25/2022] [Indexed: 01/05/2023]
Abstract
Salt tolerant plant growth boosting rhizobacteria can play an important function in plant salinity stress mitigation. In the current investigation, only two rhizobacterial isolates out of 68 produced exo-polysaccharide at the fastest rate and exhibited plant growth promoting properties such as IAA, CAT, APX production, and phosphate solubilization at 6% NaCl (w/v) concentration. Both isolates had synergistic PGP features and were compatible with one another. Isolate SP-20 was identified as Kluyvera sp. and SP-203 was identified as Enterobacter sp. -by 16SrDNA sequencing. After 30, 60, and 90 days, the combination of SP-20 and SP-203 enhanced the physicochemical parameters in the maize plant in comparison to the control. By increasing soil enzymes like DHA and PPO, both isolates significantly improved the soil health matrix. When a group of these isolates were inoculated into 1% and 2% NaCl (w/v) supplemented soil, the absorption of Na in the shoot and root of maize plants was inhibited by around 50%. The BCF values for all treatments were less than TF, and the values of BCF and TF were less than one. Therefore, the present study illustrated that the novel native isolates play a remarkable role to mitigate salinity stress in maize plant.
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Affiliation(s)
- Prabhat K Chauhan
- Department of Environmental Science, V.B.S. Purvanchal University, Jaunpur, India
| | - Sudhir K Upadhyay
- Department of Environmental Science, V.B.S. Purvanchal University, Jaunpur, India
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Lian Z, Yang Z, Song W, Sun M, Gan Y, Bai X. Characteristics of EPS from Pseudomonas aeruginosa and Alcaligenes faecalis under Cd(II) stress: changes in chemical components and adsorption performance. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:75883-75895. [PMID: 35665452 DOI: 10.1007/s11356-022-21114-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 05/23/2022] [Indexed: 06/15/2023]
Abstract
EPS (extracellular polymeric substance) production is a self-protection mechanism by which microorganisms slow or eliminate adverse effects in unfavorable environments. In this study, Pseudomonas aeruginosa and Alcaligenes faecalis were selected to explore changes in EPS components, especially protein components, under stress caused by different concentrations of Cd(II). The results showed that the protein content in EPS was the highest. The two strains achieved maximum EPS production levels of 109.17 and 214.96 mg/g VSS at Cd(II) stress concentrations of 20 and 50 mg/L, which were increased by 52.07% and 409.69% compared with the levels exhibited before stress, respectively. The protein content correlated very well with data from adsorption experiments. Furthermore, FTIR, 3D-EEM, and XPS results illustrated that after Cd(II) stress, C-N, C=O/-COOH, and R-NO2- moieties were formed in substantial quantities, and the stress effects of Pseudomonas aeruginosa were significantly higher than those of Alcaligenes faecalis. The results of this study showed that addition of Cd(NO3)2 effectively regulated the components of EPS, especially the protein content, and improved the adsorption capacity, which has application prospects for prevention and control of heavy metals.
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Affiliation(s)
- Zeyang Lian
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, Guangdong, China
| | - Zuoyi Yang
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, Guangdong, China
| | - Weifeng Song
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, Guangdong, China.
| | - Mengge Sun
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, Guangdong, China
| | - Yu Gan
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, Guangdong, China
| | - Xiaoyan Bai
- School of Environmental Science and Engineering, Guangdong University of Technology, Guangzhou, 510006, Guangdong, China
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Huang L, Jin Y, Zhou D, Liu L, Huang S, Zhao Y, Chen Y. A Review of the Role of Extracellular Polymeric Substances (EPS) in Wastewater Treatment Systems. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:12191. [PMID: 36231490 PMCID: PMC9566195 DOI: 10.3390/ijerph191912191] [Citation(s) in RCA: 24] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 09/18/2022] [Accepted: 09/21/2022] [Indexed: 06/16/2023]
Abstract
A review of the characterization and functions of extracellular polymeric substances (EPS) of microbial aggregates in biological wastewater treatment systems is presented in this paper. EPS represent the complex high-molecular-weight mixture of polymers excreted by microorganisms generated from cell lysis as well as adsorbed inorganic and organic matter from wastewater. EPS exhibit a three-dimensional, gel-like, highly hydrated matrix that facilitates microbial attachment, embedding, and immobilization. EPS play multiple roles in containments removal, and the main components of EPS crucially influence the properties of microbial aggregates, such as adsorption ability, stability, and formation capacity. Moreover, EPS are important to sludge bioflocculation, settleability, and dewatering properties and could be used as carbon and energy sources in wastewater treatment. However, due to the complex structure of EPS, related knowledge is incomplete, and further research is necessary to understand fully the precise roles in biological treatment processes.
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Affiliation(s)
- Lei Huang
- Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing 400715, China
- Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China
| | - Yinie Jin
- Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Danheng Zhou
- Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Linxin Liu
- Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Shikun Huang
- Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Yaqi Zhao
- Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing 400715, China
| | - Yucheng Chen
- Key Laboratory of the Three Gorges Reservoir Region’s Eco-Environment (Ministry of Education), College of Resources and Environment, Southwest University, Chongqing 400715, China
- Chongqing Key Laboratory of Agricultural Resources and Environment, Chongqing 400716, China
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21
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Luo X, Zhou X, Peng C, Shao P, Wei F, Li S, Liu T, Yang L, Ding L, Luo X. Bioreduction performance of Cr(VI) by microbial extracellular polymeric substances (EPS) and the overlooked role of tryptophan. JOURNAL OF HAZARDOUS MATERIALS 2022; 433:128822. [PMID: 35390619 DOI: 10.1016/j.jhazmat.2022.128822] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 03/28/2022] [Accepted: 03/29/2022] [Indexed: 06/14/2023]
Abstract
Extracellular polymeric substances (EPS) have exhibited promising advantages in mitigating heavy metal contamination, e.g., single-valent silver (Ag(I)), trivalent gold (Au(III)), and hexavalent chromium (Cr(VI)). However, knowledge of the specific substrate in EPSs that supports Cr(VI) reduction has remained elusive. Here, we isolated a novel Cr(VI)-reducing strain with self-mediating properties in an aquatic environment with various pH values to investigate the mechanisms. After analysis by a batch assay coupled with X-ray photoelectron spectroscopy (XPS), electron paramagnetic resonance (EPR), and scanning electron microscopy-energy dispersive spectrometry (SEM-EDS) spectroscopic techniques, it was found that Cr(VI) was reduced by the strain and soluble-EPS (S-EPS), and then, organo-trivalent chromium (organo-Cr(III)) was successfully formed. In addition, compared with other components of the strain, the strain and S-EPS completely removed Cr(VI), and the S-EPS exhibited a positive effect on Cr(VI) reduction with a strong monotonic correlation (R2 = 0.999, p = 9.03 × 10-5), indicating that the reduction is an EPS-dependent process. Specifically, the Cr(VI) reduction efficiency was enhanced to 48.85% and 99.4% after EPS and EPS plus tryptophan were added; their respective efficiencies were 3.94 and 8.02 times higher than that of the control assay in which the reductant was depleted. High-performance liquid chromatography-tandem mass spectrometry (HPLC-MS/MS) analysis showed that the tryptophan concentration concomitantly decreased by 61.54%. These findings highlighted the importance of S-EPS and tryptophan and improved our understanding of EPS for Cr(VI) reduction, which might provide a novel strategy for decontaminating targeted heavy metals in future applications.
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Affiliation(s)
- Xianxin Luo
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Xiaoyu Zhou
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Chengyi Peng
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Penghui Shao
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China.
| | - Feng Wei
- Jiangxi Hongcheng Environment Co., Ltd, Nanchang 330038, PR China
| | - Shujing Li
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Ting Liu
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Liming Yang
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Lin Ding
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China
| | - Xubiao Luo
- Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University, Nanchang 330063, PR China.
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22
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Moretto C, Castellane TCL, Leonel TF, Campanharo JC, de Macedo Lemos EG. Bioremediation of heavy metal-polluted environments by non-living cells from rhizobial isolates. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:46953-46967. [PMID: 35178627 DOI: 10.1007/s11356-022-18844-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Accepted: 01/20/2022] [Indexed: 06/14/2023]
Abstract
Rhizosphere bacteria, for example, rhizobia, can play several roles, and one of the most important, the protection of plant roots against toxic conditions and other environmental stresses. In this work, the action of Cu2+ and Cr6+ on cell growth and EPS production of four strains of rhizobia, Rhizobium tropici (LBMP-C01), Ensifer sp. (LBMP-C02 and LBMP-C03), and Rhizobium sp. LBMP-C04, were tested. The results confirmed the strong effect of Cu2+ and Cr6+ on bacterial exopolysaccharides (EPS) synthesis, and how cells can adsorb these metals, which may be a key factor in the interactions between rhizosphere bacteria and host plants in heavy metal-contaminated soils. Here, we emphasize the importance of proving the potential of treating bacterial cells and their extracellular EPS to promote the bio-detoxification of terrestrial and aquatic systems contaminated by heavy metals in a highly sustainable, economic, and ecological way.
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Affiliation(s)
- Cristiane Moretto
- Departamento de Biotecnologia Agropecuária e Ambiental, Faculdade de Ciências Agrárias E Veterinárias, UNESP - Univ Estadual Paulista, Rodovia Prof. Paulo Donato Castellane km 135, CEP, Jaboticabal, SP, 14884-900, Brazil
| | - Tereza Cristina Luque Castellane
- Departamento de Biotecnologia Agropecuária e Ambiental, Faculdade de Ciências Agrárias E Veterinárias, UNESP - Univ Estadual Paulista, Rodovia Prof. Paulo Donato Castellane km 135, CEP, Jaboticabal, SP, 14884-900, Brazil.
| | - Tatiane Fernanda Leonel
- Departamento de Biotecnologia Agropecuária e Ambiental, Faculdade de Ciências Agrárias E Veterinárias, UNESP - Univ Estadual Paulista, Rodovia Prof. Paulo Donato Castellane km 135, CEP, Jaboticabal, SP, 14884-900, Brazil
| | - Joao Carlos Campanharo
- Departamento de Biotecnologia Agropecuária e Ambiental, Faculdade de Ciências Agrárias E Veterinárias, UNESP - Univ Estadual Paulista, Rodovia Prof. Paulo Donato Castellane km 135, CEP, Jaboticabal, SP, 14884-900, Brazil
| | - Eliana Gertrudes de Macedo Lemos
- Departamento de Biotecnologia Agropecuária e Ambiental, Faculdade de Ciências Agrárias E Veterinárias, UNESP - Univ Estadual Paulista, Rodovia Prof. Paulo Donato Castellane km 135, CEP, Jaboticabal, SP, 14884-900, Brazil
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23
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Tyagi B, Gupta B, Khatak D, Meena R, Shekhar Thakur I. Genomic analysis, simultaneous production, and process optimization of extracellular polymeric substances and polyhydroxyalkanoates by Methylobacterium sp. ISTM1 by utilizing molasses. BIORESOURCE TECHNOLOGY 2022; 354:127204. [PMID: 35460844 DOI: 10.1016/j.biortech.2022.127204] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2022] [Revised: 04/13/2022] [Accepted: 04/18/2022] [Indexed: 06/14/2023]
Abstract
In the current study, the isolated Methylobacterium sp. ISTM1 simultaneously produced both extracellular polymeric substances (EPS) and polyhydroxyalkanoates (PHA) in a single-step process. The yield of biopolymers (EPS and PHA) was enhanced by optimizing the process parameters of EPS and PHA production. Methylobacterium sp. ISTM1 was able to produce 7.18 ± 0.04 g L-1 EPS and 1.41 ± 0.04 g L-1 PHA simultaneously at optimized culture conditions i.e., 9% molasses and pH 7. The genomic analysis of the strain has identified the involved genes and pathways in the production of EPS and PHA. Both the biopolymers were found non-toxic according to the cytotoxicity analysis. The results of the current study present the potential of the bacterium Methylobacterium sp. ISTM1 produces non-toxic biopolymers by utilizing agro-industrial waste (molasses) that can be harnessed sustainably for various applications.
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Affiliation(s)
- Bhawna Tyagi
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Bulbul Gupta
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India; Centre of Innovative and Applied Bioprocessing, Mohali, Punjab
| | - Deepak Khatak
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Ramovatar Meena
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India
| | - Indu Shekhar Thakur
- School of Environmental Sciences, Jawaharlal Nehru University, New Delhi 110067, India; Amity School of Earth and Environmental Sciences, Amity University, Gurugram, Haryana, India.
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24
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Adsorption of chromium by exopolysaccharides extracted from lignolytic phosphate solubilizing bacteria. Int J Biol Macromol 2022; 206:788-798. [DOI: 10.1016/j.ijbiomac.2022.03.047] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 02/25/2022] [Accepted: 03/09/2022] [Indexed: 12/24/2022]
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25
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Abidli A, Huang Y, Ben Rejeb Z, Zaoui A, Park CB. Sustainable and efficient technologies for removal and recovery of toxic and valuable metals from wastewater: Recent progress, challenges, and future perspectives. CHEMOSPHERE 2022; 292:133102. [PMID: 34914948 DOI: 10.1016/j.chemosphere.2021.133102] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Revised: 11/08/2021] [Accepted: 11/25/2021] [Indexed: 06/14/2023]
Abstract
Due to their numerous effects on human health and the natural environment, water contamination with heavy metals and metalloids, caused by their extensive use in various technologies and industrial applications, continues to be a huge ecological issue that needs to be urgently tackled. Additionally, within the circular economy management framework, the recovery and recycling of metals-based waste as high value-added products (VAPs) is of great interest, owing to their high cost and the continuous depletion of their reserves and natural sources. This paper reviews the state-of-the-art technologies developed for the removal and recovery of metal pollutants from wastewater by providing an in-depth understanding of their remediation mechanisms, while analyzing and critically discussing the recent key advances regarding these treatment methods, their practical implementation and integration, as well as evaluating their advantages and remaining limitations. Herein, various treatment techniques are covered, including adsorption, reduction/oxidation, ion exchange, membrane separation technologies, solvents extraction, chemical precipitation/co-precipitation, coagulation-flocculation, flotation, and bioremediation. A particular emphasis is placed on full recovery of the captured metal pollutants in various reusable forms as metal-based VAPs, mainly as solid precipitates, which is a powerful tool that offers substantial enhancement of the remediation processes' sustainability and cost-effectiveness. At the end, we have identified some prospective research directions for future work on this topic, while presenting some recommendations that can promote sustainability and economic feasibility of the existing treatment technologies.
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Affiliation(s)
- Abdelnasser Abidli
- Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, Faculty of Applied Science and Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, M5S 3G8, Canada; Institute for Water Innovation (IWI), Faculty of Applied Science and Engineering, University of Toronto, 55 St. George Street, Toronto, Ontario, M5S 1A4, Canada.
| | - Yifeng Huang
- Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, Faculty of Applied Science and Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, M5S 3G8, Canada; Institute for Water Innovation (IWI), Faculty of Applied Science and Engineering, University of Toronto, 55 St. George Street, Toronto, Ontario, M5S 1A4, Canada; State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, Heilongjiang, China
| | - Zeineb Ben Rejeb
- Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, Faculty of Applied Science and Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, M5S 3G8, Canada
| | - Aniss Zaoui
- Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, Faculty of Applied Science and Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, M5S 3G8, Canada
| | - Chul B Park
- Microcellular Plastics Manufacturing Laboratory (MPML), Department of Mechanical and Industrial Engineering, Faculty of Applied Science and Engineering, University of Toronto, 5 King's College Road, Toronto, Ontario, M5S 3G8, Canada; Institute for Water Innovation (IWI), Faculty of Applied Science and Engineering, University of Toronto, 55 St. George Street, Toronto, Ontario, M5S 1A4, Canada.
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26
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Yu H, Yan X, Weng W, Xu S, Xu G, Gu T, Guan X, Liu S, Chen P, Wu Y, Xiao F, Wang C, Shu L, Wu B, Qiu D, He Z, Yan Q. Extracellular proteins of Desulfovibrio vulgaris as adsorbents and redox shuttles promote biomineralization of antimony. JOURNAL OF HAZARDOUS MATERIALS 2022; 426:127795. [PMID: 34801311 DOI: 10.1016/j.jhazmat.2021.127795] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 11/05/2021] [Accepted: 11/11/2021] [Indexed: 06/13/2023]
Abstract
Biomineralization is the key process governing the biogeochemical cycling of multivalent metals in the environment. Although some sulfate-reducing bacteria (SRB) are recently recognized to respire metal ions, the role of their extracellular proteins in the immobilization and redox transformation of antimony (Sb) remains elusive. Here, a model strain Desulfovibrio vulgaris Hildenborough (DvH) was used to study microbial extracellular proteins of functions and possible mechanisms in Sb(V) biomineralization. We found that the functional groups (N-H, CO, O-CO, NH2-R and RCOH/RCNH2) of extracellular proteins could adsorb and fix Sb(V) through electrostatic attraction and chelation. DvH could rapidly reduce Sb(V) adsorbed on the cell surface and form amorphous nanometer-sized stibnite and/or antimony trioxide, respectively with sulfur and oxygen. Proteomic analysis indicated that some extracellular proteins involved in electron transfer increased significantly (p < 0.05) at 1.8 mM Sb(V). The upregulated flavoproteins could serve as a redox shuttle to transfer electrons from c-type cytochrome networks to reduce Sb(V). Also, the upregulated extracellular proteins involved in sulfur reduction, amino acid transport and protein synthesis processes, and the downregulated flagellar proteins would contribute to a better adaption under 1.8 mM Sb(V). This study advances our understanding of how microbial extracellular proteins promote Sb biomineralization in DvH.
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Affiliation(s)
- Huang Yu
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Xizhe Yan
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Wanlin Weng
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Sihan Xu
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Guizhi Xu
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Tianyuan Gu
- State Key Laboratory of Water Resources and Hydropower Engineering Science, Wuhan University, Wuhan, Hubei 430072, China
| | - Xiaotong Guan
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Shengwei Liu
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Pubo Chen
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Yongjie Wu
- State Environmental Protection Key Laboratory of Water Environmental Simulation and Pollution Control, South China Institute of Environmental Sciences, Ministry of Ecology and Environment of the People's Republic of China, Guangzhou 510530, PR China
| | - Fanshu Xiao
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Cheng Wang
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Longfei Shu
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Bo Wu
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China
| | - Dongru Qiu
- Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Zhili He
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China; College of Agronomy, Hunan Agricultural University, Changsha 410128, China
| | - Qingyun Yan
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), Sun Yat-sen University, Guangzhou 510006, China.
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27
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Xi Y, Xie T, Liu Y, Wu Y, Liu H, Su Z, Huang Y, Yuan X, Zhang C, Li X. Carboxymethyl cellulose stabilized ferrous sulfide@extracellular polymeric substance for Cr(VI) removal: Characterization, performance, and mechanism. JOURNAL OF HAZARDOUS MATERIALS 2022; 425:127837. [PMID: 34883376 DOI: 10.1016/j.jhazmat.2021.127837] [Citation(s) in RCA: 20] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2021] [Revised: 11/15/2021] [Accepted: 11/15/2021] [Indexed: 06/13/2023]
Abstract
Iron-based materials, especially ferrous sulfide (FeS), effectively remediate chromium pollution. However, the agglomeration of FeS reduces its reactivity to chromium. Herein, carboxymethyl cellulose stabilized ferrous sulfide@extracellular polymeric substance (CMC-FeS@EPS) was developed to remove hexavalent chromium (Cr(VI)) from water. CMC-FeS@EPS (98.00%) exhibited excellent removal efficiency of 40 mg/L Cr(VI) than those of FeS (57.35%) and CMC-FeS (68.60%). CMC-FeS@EPS showed good removal efficiency of Cr(VI) in wide pH range (from 4 to 9) and the co-existence of ions. FTIR and XPS results demonstrated that EPS functional group accelerated the process of adsorption and precipitation. Electrochemical results showed that CMC-FeS@EPS transferred electrons to Cr(VI) faster than CMC-FeS. In total, this study started from a new idea of using EPS to improve the performance of CMC-FeS, and provided a simple and effective way to remediate chromium pollution without secondary pollution.
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Affiliation(s)
- Yanni Xi
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Tanghuan Xie
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Yanfen Liu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Yangtao Wu
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha, Hunan 410082, PR China
| | - Huinian Liu
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Zhu Su
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Yicai Huang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Xingzhong Yuan
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Chang Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China
| | - Xin Li
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China; Key Laboratory of Environmental Biology and Pollution Control (Hunan University), Ministry of Education, Changsha 410082, PR China.
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28
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Gavrilescu M. Microbial recovery of critical metals from secondary sources. BIORESOURCE TECHNOLOGY 2022; 344:126208. [PMID: 34715340 DOI: 10.1016/j.biortech.2021.126208] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 10/17/2021] [Accepted: 10/20/2021] [Indexed: 06/13/2023]
Abstract
The continuous development of technologies involving critical metals, both in Europe and over the world, and geopolitical challenges in areas rich in critical metal sources, imposed increased research efforts to recover them from secondary sources, by eco-efficient processes. Yet, microbes-metal interactions are not sufficiently exploited to recover metals from secondary sources, although they are already used in ore extraction. This review examines and compare strategies and processes involving microorganisms for critical metals recovery, since conventional physico-chemical methods are energy-intensive and often polluting. Two groups of microbial assisted recovery processes are discussed: metal mobilization from metal bearing waste, and selective metal separation from leaching solutions by immobilization on microbial biomass. Because most of the identified microbial technologies are developed on laboratory scale, the increase of biorecovery efficiency is compulsory for enhancing scaling-up potential. Future developments focused on novel microorganisms and high-performance strategies for critical metal recovery by microbial processes are considered.
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Affiliation(s)
- Maria Gavrilescu
- "Gheorghe Asachi" Technical University of Iasi, "Cristofor Simionescu" Faculty of Chemical Engineering and Environmental Protection, Department of Environmental Engineering and Management, 73 Prof. Mangeron Blvd., 700050 Iasi, Romania.
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29
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Mahto KU, Kumari S, Das S. Unraveling the complex regulatory networks in biofilm formation in bacteria and relevance of biofilms in environmental remediation. Crit Rev Biochem Mol Biol 2021; 57:305-332. [PMID: 34937434 DOI: 10.1080/10409238.2021.2015747] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Biofilms are assemblages of bacteria embedded within a matrix of extracellular polymeric substances (EPS) attached to a substratum. The process of biofilm formation is a complex phenomenon regulated by the intracellular and intercellular signaling systems. Various secondary messenger molecules such as cyclic dimeric guanosine 3',5'-monophosphate (c-di-GMP), cyclic adenosine 3',5'-monophosphate (cAMP), and cyclic dimeric adenosine 3',5'-monophosphate (c-di-AMP) are involved in complex signaling networks to regulate biofilm development in several bacteria. Moreover, the cell to cell communication system known as Quorum Sensing (QS) also regulates biofilm formation via diverse mechanisms in various bacterial species. Bacteria often switch to the biofilm lifestyle in the presence of toxic pollutants to improve their survivability. Bacteria within a biofilm possess several advantages with regard to the degradation of harmful pollutants, such as increased protection within the biofilm to resist the toxic pollutants, synthesis of extracellular polymeric substances (EPS) that helps in the sequestration of pollutants, elevated catabolic gene expression within the biofilm microenvironment, higher cell density possessing a large pool of genetic resources, adhesion ability to a wide range of substrata, and metabolic heterogeneity. Therefore, a comprehensive account of the various factors regulating biofilm development would provide valuable insights to modulate biofilm formation for improved bioremediation practices. This review summarizes the complex regulatory networks that influence biofilm development in bacteria, with a major focus on the applications of bacterial biofilms for environmental restoration.
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Affiliation(s)
- Kumari Uma Mahto
- Department of Life Science, Laboratory of Environmental Microbiology and Ecology (LEnME), National Institute of Technology, Odisha, India
| | - Swetambari Kumari
- Department of Life Science, Laboratory of Environmental Microbiology and Ecology (LEnME), National Institute of Technology, Odisha, India
| | - Surajit Das
- Department of Life Science, Laboratory of Environmental Microbiology and Ecology (LEnME), National Institute of Technology, Odisha, India
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30
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Biosorption of Pb 2+ and Zn 2+ by Ca-alginate immobilized and free extracellular polysaccharides produced by Leuconostoc citreum B-2. Int J Biol Macromol 2021; 193:2365-2373. [PMID: 34798193 DOI: 10.1016/j.ijbiomac.2021.11.070] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2021] [Revised: 11/10/2021] [Accepted: 11/10/2021] [Indexed: 01/17/2023]
Abstract
AIMS Heavy metal pollution seriously threatens human health and ecological environment. Due to high efficiency and excellent development prospect, adsorption technology has attracted worldwide attention. It is significant to develop renewable adsorbents with excellent adsorption performance. SCOPE In this study, the Pb2+ and Zn2+ adsorption capacity of Ca-alginate immobilized and free (without immobilization) Leu. citreum B-2 extracellular polysaccharides (EPS) was investigated. Isotherm and kinetic models were used to evaluate the adsorption performance. The adsorbents were characterized by SEM, FT-IR and XPS spectroscopy. CONCLUSIONS The maximum biosorption of Pb2+ 269.54 and Zn2+ 49.88 mg/g was achieved with immobilized EPS. Thermodynamic studies showed that the adsorption of Pb2+ and Zn2+ on EPS was a spontaneous and feasible process, and the adsorption properties of EPS were exothermic for lead and endothermic for zinc. All the adsorption processes conformed to the pseudo-second-order model and Langmuir adsorption isotherm model, indicating that the adsorption was mainly chemisorption taken placed on single adsorption surface. SEM results showed that the surface of EPS become denser after adsorption. FTIR and XPS analysis indicated that the adsorption mechanism mainly involved the complexation reaction and ion exchange of functional groups such as CO, O-C-O, -COOH and C-OH.
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31
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Rana A, Sindhu M, Kumar A, Dhaka RK, Chahar M, Singh S, Nain L. Restoration of heavy metal-contaminated soil and water through biosorbents: A review of current understanding and future challenges. PHYSIOLOGIA PLANTARUM 2021; 173:394-417. [PMID: 33724481 DOI: 10.1111/ppl.13397] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 02/13/2021] [Accepted: 03/07/2021] [Indexed: 06/12/2023]
Abstract
Heavy metal pollution in soil and water is a potential threat to human health as it renders food quality substandard. Different biosorbents such as microbial and agricultural biomass have been exploited for heavy metal immobilization in soil and sorptive removal in waters. Biosorption is an effective and sustainable method for heavy metal removal in soil and water, but the inherent challenges are to find cheap, selective, robust, and cost-effective bioadsorbents. Microbial and agricultural biomass and their modified forms such as nanocomposites and carbonaceous materials (viz., biochar, nanobiochar, biocarbon), might be useful for sequestration of heavy metals in soil via adsorption, ion exchange, complexation, precipitation, and enzymatic transformation mechanisms. In this review, potential biosorbents and their metal removal capacity in soil and water are discussed. The microbial adsorbents and modified composites of agricultural biomasses show improved performance, stability, reusability, and effectively immobilize heavy metals from soil and water. In the future, researchers may consider the modified composites, encapsulated biosorbents for soil and water remediation.
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Affiliation(s)
- Anuj Rana
- Department of Microbiology (COBS & H), CCS Haryana Agricultural University, Hisar, India
| | - Meena Sindhu
- Department of Microbiology (COBS & H), CCS Haryana Agricultural University, Hisar, India
| | - Ajay Kumar
- Department of Microbiology (COBS & H), CCS Haryana Agricultural University, Hisar, India
| | - Rahul Kumar Dhaka
- Department of Chemistry, Environmental Sciences, and Centre for Bio-Nanotechnology, CCS Haryana Agricultural University, Hisar, India
| | - Madhvi Chahar
- Department of food quality and safety, Institute of Post Harvest, Agricultural Research Organization, The Volcani Research Center, Bet-Dagan, Israel
| | - Surender Singh
- Department of Microbiology, Central University of Haryana, Mahendragarh, India
| | - Lata Nain
- Division of Microbiology, ICAR-Indian Agricultural Research Institute, New Delhi, India
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Banerjee A, Sarkar S, Govil T, González-Faune P, Cabrera-Barjas G, Bandopadhyay R, Salem DR, Sani RK. Extremophilic Exopolysaccharides: Biotechnologies and Wastewater Remediation. Front Microbiol 2021; 12:721365. [PMID: 34489911 PMCID: PMC8417407 DOI: 10.3389/fmicb.2021.721365] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2021] [Accepted: 07/26/2021] [Indexed: 01/18/2023] Open
Abstract
Various microorganisms thrive under extreme environments, like hot springs, hydrothermal vents, deep marine ecosystems, hyperacid lakes, acid mine drainage, high UV exposure, and more. To survive against the deleterious effect of these extreme circumstances, they form a network of biofilm where exopolysaccharides (EPSs) comprise a substantial part. The EPSs are often polyanionic due to different functional groups in their structural backbone, including uronic acids, sulfated units, and phosphate groups. Altogether, these chemical groups provide EPSs with a negative charge allowing them to (a) act as ligands toward dissolved cations as well as trace, and toxic metals; (b) be tolerant to the presence of salts, surfactants, and alpha-hydroxyl acids; and (c) interface the solubilization of hydrocarbons. Owing to their unique structural and functional characteristics, EPSs are anticipated to be utilized industrially to remediation of metals, crude oil, and hydrocarbons from contaminated wastewaters, mines, and oil spills. The biotechnological advantages of extremophilic EPSs are more diverse than traditional biopolymers. The present review aims at discussing the mechanisms and strategies for using EPSs from extremophiles in industries and environment bioremediation. Additionally, the potential of EPSs as fascinating biomaterials to mediate biogenic nanoparticles synthesis and treat multicomponent water contaminants is discussed.
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Affiliation(s)
- Aparna Banerjee
- Centro de investigación en Estudios Avanzados del Maule (CIEAM), Vicerrectoría de Investigación Y Posgrado, Universidad Católica del Maule, Talca, Chile
- Centro de Biotecnología de los Recursos Naturales (CENBio), Facultad de Ciencias Agrarias Y Forestales, Universidad Católica del Maule, Talca, Chile
| | - Shrabana Sarkar
- Department of Botany, UGC-Center of Advanced Study, The University of Burdwan, Golapbag, Burdwan, India
| | - Tanvi Govil
- Department of Chemical and Biological Engineering, South Dakota Mines, Rapid City, SD, United States
- Composite and Nanocomposite Advanced Manufacturing – Biomaterials Center, Rapid City, SD, United States
| | - Patricio González-Faune
- Escuela Ingeniería en Biotecnología, Facultad de Ciencias Agrarias Y Forestales, Universidad Católica del Maule, Talca, Chile
| | | | - Rajib Bandopadhyay
- Department of Botany, UGC-Center of Advanced Study, The University of Burdwan, Golapbag, Burdwan, India
| | - David R. Salem
- Department of Botany, UGC-Center of Advanced Study, The University of Burdwan, Golapbag, Burdwan, India
- Department of Chemical and Biological Engineering, South Dakota Mines, Rapid City, SD, United States
- Department of Materials and Metallurgical Engineering, South Dakota Mines, Rapid City, SD, United States
| | - Rajesh K. Sani
- Department of Botany, UGC-Center of Advanced Study, The University of Burdwan, Golapbag, Burdwan, India
- Department of Chemical and Biological Engineering, South Dakota Mines, Rapid City, SD, United States
- BuGReMeDEE Consortium, South Dakota School of Mines and Technology, Rapid City, SD, United States
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Huang Y, Zeng Q, Hu L, Zhong H, He Z. Bioreduction performances and mechanisms of Cr(VI) by Sporosarcina saromensis W5, a novel Cr(VI)-reducing facultative anaerobic bacteria. JOURNAL OF HAZARDOUS MATERIALS 2021; 413:125411. [PMID: 33609863 DOI: 10.1016/j.jhazmat.2021.125411] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Revised: 02/02/2021] [Accepted: 02/10/2021] [Indexed: 06/12/2023]
Abstract
This study reported a novel facultative anaerobic Cr(VI)-reducing bacteria (Sporosarcina saromensis W5) and investigated its Cr(VI) removal performances and removal mechanisms. The strain W5 was able to grow and reduce Cr(VI) under aerobic and anaerobic environment, and exhibited considerable Cr(VI) reduction capabilities under a wide range of pH (8.0-13.0), temperature (20-40 °C) and initial Cr(VI) concentration (50-800 mg/L). The addition of Cd2+ severely inhibited its growth and Cr(VI) removal, while Cu2+ and Fe3+ significantly enhanced the removal efficiencies. The strain W5 could utilize various electron donors and mediators to accelerate Cr(VI) reduction. Aerobic Cr(VI) reduction mainly occurred in cytoplasm and the final products were soluble organo-Cr(III) complexes. Anaerobic Cr(VI) reduction was located in both cytoplasm and membrane, and the reduction products were soluble organo-Cr(III) complexes and Cr(III) precipitates. The functional groups of hydroxyl, carboxyl and phosphoryl on cell surface participated in the combination with Cr(III). Due to its facultative anaerobic property, S. saromensis W5 offers itself as a promising engineering strain for the bioremediation of Cr(VI)-contaminated areas, especially in hypoxia environments.
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Affiliation(s)
- Yongji Huang
- School of Minerals Processing and Bioengineering, Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Qiang Zeng
- School of Minerals Processing and Bioengineering, Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Liang Hu
- School of Minerals Processing and Bioengineering, Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University, Changsha 410083, China
| | - Hui Zhong
- School of Life Science, Central South University, Changsha 410012, China.
| | - Zhiguo He
- School of Minerals Processing and Bioengineering, Key Laboratory of Biohydrometallurgy of Ministry of Education, Central South University, Changsha 410083, China.
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Sengupta D, Datta S, Biswas D, Banerjee S, Das S. Prospective bioremediation of toxic heavy metals in water by surfactant exopolysaccharide of Ochrobactrum pseudintermedium using cost-effective substrate. Int Microbiol 2021; 24:441-453. [PMID: 33987705 DOI: 10.1007/s10123-021-00182-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 04/17/2021] [Accepted: 04/30/2021] [Indexed: 11/26/2022]
Abstract
Globally, the underlying peril of cumulative toxicity of heavy metals in water bodies contaminated by industrial effluents is a matter of great concern to the environmentalists. Heavy metals like lead, cadmium, and nickel are particularly liable for this. Such toxic water is not only hazardous to human health but also harmful to aquatic animals. Remedial measures are being taken by physico-chemical techniques, but most of them are neither eco-friendly nor cost-effective. Biological means like bioaccumulation of heavy metals by viable bacteria are often tedious. In the present study, biosorption of heavy metals is successfully expedited by surfactant exopolysaccharide (SEPS) of Ochrobactrum pseudintermedium C1 as a simple, safe, and economically sustainable option utilizing an easily available and cost-effective substrate like molasses extract. Its efficacy in bioremediation of toxic heavy metals like cadmium, nickel, and lead have been studied by UV-Vis spectrophotometry and verified by inductively coupled plasma-atomic emission spectroscopy (ICP-AES). FTIR and zeta potential studies have also been carried out to explore this novel biosorption potential. Results are conclusive and promising. Moreover, this particular SEPS alone can remediate all these three toxic heavy metals in water. For futuristic applications, it might be a prospective and cost-effective resource for bioremediation of toxic heavy metals in aqueous environment.
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Affiliation(s)
- Dipanjan Sengupta
- Department of Chemical Technology, Rajabazar Science College, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata, 700009, India
| | - Sriparna Datta
- Department of Chemical Technology, Rajabazar Science College, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata, 700009, India.
| | - Dipa Biswas
- Department of Chemical Technology, Rajabazar Science College, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata, 700009, India
| | - Shrayasi Banerjee
- Department of Chemical Technology, Rajabazar Science College, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata, 700009, India
| | - Souvik Das
- Department of Chemical Technology, Rajabazar Science College, University of Calcutta, 92, Acharya Prafulla Chandra Road, Kolkata, 700009, India
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Abstract
Toxic metal contamination has serious effects on human health. Crude oil that may contain toxic metals and oil spills can further contaminate the environment and lead to increased exposure. This being the case, we chose to study the bio-production of inexpensive, environmentally safe materials for remediation. Streptomyces sp. MOE6 is a Gram-positive, filamentous bacterium from soil that produces an extracellular polysaccharide (MOE6-EPS). A one-factor-at-a-time experiments showed that the maximum production of MOE6-EPS was achieved at 35 °C, pH 6, after nine days of incubation with soluble starch and yeast extract as carbon sources and the latter as the nitrogen source. We demonstrated that MOE6-EPS has the capacity to remove toxic metals such as Co(II), Cr(VI), Cu(II) and U(VI) and from solution either by chelation and/or reduction. Additionally, the bacterium was found to produce siderophores, which contribute to the removal of metals, specifically Fe(III). Additionally, purified MOE6-EPS showed emulsifying activities against various hydrophobic substances, including olive oil, corn oil, benzene, toluene and engine oil. These results indicate that EPS from Streptomyces sp. MOE6 may be useful to sequester toxic metals and oil in contaminated environments.
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Abstract
Biosorption is a variant of sorption techniques in which the sorbent is a material of biological origin. This technique is considered to be low cost and environmentally friendly, and it can be used to remove pollutants from aqueous solutions. The objective of this review is to report on the most significant recent works and most recent advances that have occurred in the last couple of years (2019–2020) in the field of biosorption. Biosorption of metals and organic compounds (dyes, antibiotics and other emerging contaminants) is considered in this review. In addition, the use and possibilities of different forms of biomass (live or dead, modified or immobilized) are also considered.
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