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Fernandez M, Callegari EA, Paez MD, González PS, Agostini E. Proteomic analysis to unravel the biochemical mechanisms triggered by Bacillus toyonensis SFC 500-1E under chromium(VI) and phenol stress. Biometals 2023; 36:1081-1108. [PMID: 37209221 DOI: 10.1007/s10534-023-00506-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Accepted: 04/24/2023] [Indexed: 05/22/2023]
Abstract
Bacillus toyonensis SFC 500-1E is a member of the consortium SFC 500-1 able to remove Cr(VI) and simultaneously tolerate high phenol concentrations. In order to elucidate mechanisms utilized by this strain during the bioremediation process, the differential expression pattern of proteins was analyzed when it grew with or without Cr(VI) (10 mg/L) and Cr(VI) + phenol (10 and 300 mg/L), through two complementary proteomic approaches: gel-based (Gel-LC) and gel-free (shotgun) nanoUHPLC-ESI-MS/MS. A total of 400 differentially expressed proteins were identified, out of which 152 proteins were down-regulated under Cr(VI) and 205 up-regulated in the presence of Cr(VI) + phenol, suggesting the extra effort made by the strain to adapt itself and keep growing when phenol was also added. The major metabolic pathways affected include carbohydrate and energetic metabolism, followed by lipid and amino acid metabolism. Particularly interesting were also ABC transporters and the iron-siderophore transporter as well as transcriptional regulators that can bind metals. Stress-associated global response involving the expression of thioredoxins, SOS response, and chaperones appears to be crucial for the survival of this strain under treatment with both contaminants. This research not only provided a deeper understanding of B. toyonensis SFC 500-1E metabolic role in Cr(VI) and phenol bioremediation process but also allowed us to complete an overview of the consortium SFC 500-1 behavior. This may contribute to an improvement in its use as a bioremediation strategy and also provides a baseline for further research.
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Affiliation(s)
- Marilina Fernandez
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina.
- CONICET, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina.
| | - Eduardo A Callegari
- Division of Basic Biomedical Sciences Sanford School of Medicine, University of South Dakota, Vermillion, SD, USA
| | - María D Paez
- Division of Basic Biomedical Sciences Sanford School of Medicine, University of South Dakota, Vermillion, SD, USA
| | - Paola S González
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina
- CONICET, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina
| | - Elizabeth Agostini
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina
- CONICET, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina
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2
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Fernandez M, Callegari EA, Paez MD, González PS, Agostini E. Functional response of Acinetobacter guillouiae SFC 500-1A to tannery wastewater as revealed by a complementary proteomic approach. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 342:118333. [PMID: 37320920 DOI: 10.1016/j.jenvman.2023.118333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 04/22/2023] [Accepted: 06/04/2023] [Indexed: 06/17/2023]
Abstract
Acinetobacter guillouiae SFC 500-1 A is a promising candidate for the bioremediation of tannery wastewater. In this study, we applied shotgun proteomic technology in conjunction with a gel-based assay (Gel-LC) to explore the strain's intracellular protein profile when grown in tannery wastewater as opposed to normal culture conditions. A total of 1775 proteins were identified, 52 of which were unique to the tannery wastewater treatment. Many of them were connected to the degradation of aromatic compounds and siderophore biosynthesis. On the other hand, 1598 proteins overlapped both conditions but were differentially expressed in each. Those that were upregulated in wastewater (109) were involved in the processes mentioned above, as well as in oxidative stress mitigation and intracellular redox state regulation. Particularly interesting were the downregulated proteins under the same treatment (318), which were diverse but mainly linked to the regulation of basic cellular functions (replication, transcription, translation, cell cycle, and wall biogenesis); metabolism (amino acids, lipids, sulphate, energetic processes); and other more complex responses (cell motility, exopolysaccharide production, biofilm formation, and quorum sensing). The findings suggest that SFC 500-1 A engages in survival and stress management strategies to cope with the toxic effects of tannery wastewater, and that such strategies may be mostly oriented at keeping metabolic processes to a minimum. Altogether, the results might be useful in the near future to improve the strain's effectiveness if it will be applied for bioremediation.
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Affiliation(s)
- Marilina Fernandez
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), 5800, Río Cuarto, Córdoba, Argentina; Instituto de Biotecnología Ambiental y Salud (INBIAS-CONICET), Río Cuarto, Córdoba, Argentina.
| | - Eduardo A Callegari
- Division of Basic Biomedical Sciences, Sanford School of Medicine of the University of South Dakota, Vermillion, SD, USA.
| | - María D Paez
- Division of Basic Biomedical Sciences, Sanford School of Medicine of the University of South Dakota, Vermillion, SD, USA.
| | - Paola S González
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), 5800, Río Cuarto, Córdoba, Argentina; Instituto de Biotecnología Ambiental y Salud (INBIAS-CONICET), Río Cuarto, Córdoba, Argentina.
| | - Elizabeth Agostini
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), 5800, Río Cuarto, Córdoba, Argentina; Instituto de Biotecnología Ambiental y Salud (INBIAS-CONICET), Río Cuarto, Córdoba, Argentina.
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Zhao C, Xue L, Shi H, Chen W, Zhong Y, Zhang Y, Zhou Y, Huang K. Simultaneous degradation of p-nitrophenol and reduction of Cr(VI) in one step using microwave atmospheric pressure plasma. WATER RESEARCH 2022; 212:118124. [PMID: 35121417 DOI: 10.1016/j.watres.2022.118124] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Revised: 01/24/2022] [Accepted: 01/25/2022] [Indexed: 06/14/2023]
Abstract
Different physicochemical properties between Cr(VI) and phenolic compounds pose serious challenges for the effective treatment of co-contamination. This study developed an electrodeless high-flow microwave atmospheric plasma jet for the single-step simultaneous degradation of p-nitrophenol (PNP) and reduction of Cr(VI). Following a 15 min treatment with microwave atmospheric pressure plasma, the removal efficiency of Cr(VI) and PNP reached 97.5% and 93.6%, respectively, whereas that of total organic carbon reached 30.2%. Adding PNP to the solution significantly improved Cr(VI) reduction, whereas PNP degradation increased slightly with Cr(VI). The results indicate that the PNP intermediates significantly affected Cr(VI) reduction. Additionally, long-lived H2O2 and short-lived ·H aided the reduction of Cr(VI) during plasma treatment. The addition of hydroxyl scavengers during treatment implied that ·OH was largely responsible for PNP oxidation. High-performance liquid chromatography-mass spectroscopy (HPLC-MS) revealed that PNP intermediates, including p-nitrocatechol and 5-nitrobenzene-1,2,3-triol, function as Cr(VI) reductants. On the basis of the examined intermediate products, the potential PNP degradation pathway was investigated. The factors that could influence simultaneous dehgradation and reduction, including solution pH, gas velocity, and distance between the plasma outlet and the water surface were researched. Low pH supports Cr(VI) reduction, and the promotion of PNP for Cr(VI) reduction applies to all pH values. The degradation of PNP is insensitive to pH values with or without Cr(VI). The optimal gas velocity for PNP degradation and Cr(VI) reduction was revealed to be 6 L/min. The simultaneous removal of PNP and Cr(VI) benefits from a shorter distance between the plasma outlet and the water's surface.
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Affiliation(s)
- Chaoxia Zhao
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
| | - Li Xue
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
| | - Hongxiao Shi
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
| | - Wenqi Chen
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
| | - Yu Zhong
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
| | - Yi Zhang
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China.
| | - Yanping Zhou
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China
| | - Kama Huang
- College of Electronics and Information Engineering, Sichuan University, Chengdu 610064, China.
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Pereira PP, Fernandez M, Cimadoro J, González PS, Morales GM, Goyanes S, Agostini E. Biohybrid membranes for effective bacterial vehiculation and simultaneous removal of hexavalent chromium (CrVI) and phenol. Appl Microbiol Biotechnol 2021; 105:827-838. [PMID: 33394154 DOI: 10.1007/s00253-020-11031-x] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2020] [Revised: 11/14/2020] [Accepted: 11/22/2020] [Indexed: 10/22/2022]
Abstract
The aim of the present study was to obtain an effective vehiculation system in which bacterial agents could maintain viability improving their removal capacity. Herein, we present a novel biohybrid membrane of polymeric nanofibers and free-living bacteria for the simultaneous removal of pollutants. In this system, bacteria are free within the pores between the nanofibers and adsorbed to the surface of the membranes. Association between bacteria and the membranes was performed through a self-formulated medium, and the presence of the bacteria in the polymeric matrix was evidenced through atomic force microscopy (AFM). Biohybrid membranes associated with the remediation agents Bacillus toyonensis SFC 500-1E and Acinetobacter guillouiae SFC 500-1A promoted a reduction of up to 2.5 mg/L of hexavalent chromium and up to 200 mg/L of phenol after 24 h of treatment in synthetic medium containing the contaminants. Similarly, more than 46% of the hexavalent chromium and all of the phenol content were removed after treatment of a tannery effluent with initial concentrations of 7 mg/L of Cr(VI) and 305 mg/L of phenol. Counts of the remediation agents from the membranes were always above 1.107 CFU/g, also in the reutilization assays performed without reinoculation. Biohybrid membranes were hydrolysis-resistant, reusable, and effective in the simultaneous removal of contaminants for more than 5 cycles. Viability of the microorganisms was maintained after long-term storage of the membranes at 4 °C, without the use of microbiological media or the addition of cryoprotectants. Graphical abstract KEY POINTS: • Polymeric membranes were effectively associated with the SFC 500-1 remediation consortium • Biohybrid membranes removed hexavalent chromium and phenol from different matrices • Removal of contaminants was achieved in many successive cycles without reinoculation.
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Affiliation(s)
- Paola P Pereira
- Departamento de Biología Molecular, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 Km 601, 5800, Rio Cuarto, CP, Argentina.,Instituto de Biotecnología Ambiental y Salud, INBIAS-CONICET, Río Cuarto, Argentina
| | - Marilina Fernandez
- Departamento de Biología Molecular, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 Km 601, 5800, Rio Cuarto, CP, Argentina.,Instituto de Biotecnología Ambiental y Salud, INBIAS-CONICET, Río Cuarto, Argentina
| | - Jonathan Cimadoro
- Laboratorio de Polímeros y Materiales Compuestos, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.,Instituto de Física de Buenos Aires IFIBA, CONICET, Buenos Aires, Argentina
| | - Paola S González
- Departamento de Biología Molecular, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 Km 601, 5800, Rio Cuarto, CP, Argentina.,Instituto de Biotecnología Ambiental y Salud, INBIAS-CONICET, Río Cuarto, Argentina
| | - Gustavo M Morales
- Departamento de Química, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Rio Cuarto, Argentina.,Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados, IITEMA-CONICET, Río Cuarto, Argentina
| | - Silvia Goyanes
- Laboratorio de Polímeros y Materiales Compuestos, Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina.,Instituto de Física de Buenos Aires IFIBA, CONICET, Buenos Aires, Argentina
| | - Elizabeth Agostini
- Departamento de Biología Molecular, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto, Ruta 36 Km 601, 5800, Rio Cuarto, CP, Argentina. .,Instituto de Biotecnología Ambiental y Salud, INBIAS-CONICET, Río Cuarto, Argentina.
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Fernandez M, Pereira PP, Agostini E, González PS. Impact assessment of bioaugmented tannery effluent discharge on the microbiota of water bodies. ECOTOXICOLOGY (LONDON, ENGLAND) 2020; 29:973-986. [PMID: 32556791 DOI: 10.1007/s10646-020-02237-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 05/30/2020] [Indexed: 05/09/2023]
Abstract
Effluents are commonly discharged into water bodies, and in order for the process to be as environmentally sound as possible, the potential effects on native water communities must be assessed alongside the quality parameters of the effluents themselves. In the present work, changes in the bacterial diversity of streamwater receiving a tannery effluent were monitored by high-throughput MiSeq sequencing. Physico-chemical and microbiological parameters and acute toxicity were also evaluated through different bioassays. After the discharge of treated effluents that had been either naturally attenuated or bioaugmented, bacterial diversity decreased immediately in the streamwater samples, as evidenced by the over-representation of taxa such as Brachymonas, Arcobacter, Marinobacterium, Myroides, Paludibacter and Acinetobacter, typically found in tannery effluents. However, there were no remarkable changes in diversity over time (after 1 day). In terms of the physico-chemical and microbiological parameters analyzed, chemical oxygen demand and total bacterial count increased in response to discharge of the treated effluents. No lethal effects were observed in Lactuca sativa L. seeds or Rhinella arenarum embryos exposed to the streamwater that had received the treated effluents. All of these results contribute to the growing knowledge about the environmental safety of effluent discharge procedures.
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Affiliation(s)
- Marilina Fernandez
- Departamento de Biología Molecular, FCEFQyN, INBIAS-CONICET, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina
| | - Paola P Pereira
- Departamento de Biología Molecular, FCEFQyN, INBIAS-CONICET, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina
| | - Elizabeth Agostini
- Departamento de Biología Molecular, FCEFQyN, INBIAS-CONICET, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina.
| | - Paola S González
- Departamento de Biología Molecular, FCEFQyN, INBIAS-CONICET, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina
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6
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Pereira PP, Torres Tejerizo GA, Fernandez M, Blanch AR, Gonzalez PS, Agostini E. Polyphasic characterization and identification of the bioremediation agent Bacillus sp. SFC 500-1E. Genomics 2020; 112:4525-4535. [PMID: 32781202 DOI: 10.1016/j.ygeno.2020.08.008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2020] [Revised: 07/09/2020] [Accepted: 08/06/2020] [Indexed: 11/16/2022]
Abstract
Bacillus sp. SFC 500-1E is used for the effective treatment of tannery effluents since it consistently removes hexavalent chromium from diverse contaminated matrices. The aim of the present study was to complete identification of the strain through a polyphasic characterization, which included the pattern of carbohydrate utilization, fatty acids profile, multilocus sequence analysis, multiplex PCR profile and the analysis of the complete genome sequence. Morpho-physiological and biochemical characterization results and analysis of 16S rRNA sequences were not conclusive. The strain formed a monophyletic clade with B. toyonensis BCT-7112, B. thuringiensis MC28 and B. cereus Rock 1-3. However, genomic comparisons with type strains of B. cereus and B. thuringiensis showed that the isolated belonged to a different species. Results of this study highlight the relevance of the genome sequence of this strain, identified as Bacillus toyonensis SFC 500-1E, to expand knowledge of its bioremediation potential and to explore unknown decontamination activities.
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Affiliation(s)
- Paola P Pereira
- Departamento de Biología Molecular, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto. Instituto de Biotecnología Ambiental y Salud, INBIAS-CONICET. Ruta Nacional 36 Km 601 (CP 5800), Río Cuarto, Córdoba, Argentina
| | - Gonzalo A Torres Tejerizo
- Departamento de Ciencias Biológicas, Facultad de Ciencias Exactas, Universidad Nacional de La Plata. Instituto de Biotecnología y Biología Molecular (IBBM), CCT-La Plata, CONICET. Calles 49 y 115 (1900), La Plata, Buenos Aires, Argentina
| | - Marilina Fernandez
- Departamento de Biología Molecular, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto. Instituto de Biotecnología Ambiental y Salud, INBIAS-CONICET. Ruta Nacional 36 Km 601 (CP 5800), Río Cuarto, Córdoba, Argentina
| | - Anicet R Blanch
- Departament de Genètica, Microbiologia i Estadística. Facultat de Biologia. Universitat de Barcelona. Av. Diagonal, 643, edifici annex, planta 0 08028 Barcelona, Catalunya, Spain
| | - Paola S Gonzalez
- Departamento de Biología Molecular, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto. Instituto de Biotecnología Ambiental y Salud, INBIAS-CONICET. Ruta Nacional 36 Km 601 (CP 5800), Río Cuarto, Córdoba, Argentina
| | - Elizabeth Agostini
- Departamento de Biología Molecular, Facultad de Ciencias Exactas, Físico-Químicas y Naturales, Universidad Nacional de Río Cuarto. Instituto de Biotecnología Ambiental y Salud, INBIAS-CONICET. Ruta Nacional 36 Km 601 (CP 5800), Río Cuarto, Córdoba, Argentina.
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7
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Duraisamy P, Sekar J, Arunkumar AD, Ramalingam PV. Kinetics of Phenol Biodegradation by Heavy Metal Tolerant Rhizobacteria Glutamicibacter nicotianae MSSRFPD35 From Distillery Effluent Contaminated Soils. Front Microbiol 2020; 11:1573. [PMID: 32760369 PMCID: PMC7373764 DOI: 10.3389/fmicb.2020.01573] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 06/17/2020] [Indexed: 11/13/2022] Open
Abstract
Biodegradation of phenol using bacteria is recognized as an efficient, environmentally friendly and cost-effective approach for reducing phenol pollutants compared to the current conventional physicochemical processes adopted. A potential phenol degrading bacterial strain Glutamicibacter nicotianae MSSRFPD35 was isolated and identified from Canna indica rhizosphere grown in distillery effluent contaminated sites. It showed high phenol degrading efficiency up to 1117 mg L–1 within 60 h by the secretion of catechol 1,2-dioxygenase via ortho intradial pathway. The strain MSSRFPD35 possess both the catechol 1,2 dioxygenase and catechol 2,3 dioxygenase coding genes that drive the ortho and meta pathways, but the enzymatic assay revealed that the strain cleaves catechol via ortho pathway. Haldane’s kinetic method was well fit to exponential growth data and the following kinetic parameter was obtained: μ∗ = 0.574 h–1, Ki = 268.1, Ks = 20.29 mg L–1. The true μmax and Sm were calculated as 0.37 h–1 and 73.76 mg L–1, respectively. The Haldane’s constant values were similar to earlier studies and healthy fitness depicted in correlation coefficient value R2 of 0.98. Phenol degrading kinetic’s was predicted using Haldane’s model as qmax 0.983, Ki′ 517.5 and Ks′ 9.152. Further, MSSRFPD35 was capable of utilizing different monocyclic and polycyclic aromatic hydrocarbons and to degrade phenol in the presence of different heavy metals. This study for the first time reports high phenol degrading efficiency of G. nicotianae MSSRFPD35 in the presence of toxic heavy metals. Thus, the strain G. nicotianae MSSRFPD35 can be exploited for the bioremediation of phenol and its derivatives polluted environments, co-contaminated with heavy metals.
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Affiliation(s)
- Purushothaman Duraisamy
- Microbiology Lab, Biotechnology Programme, M. S. Swaminathan Research Foundation, Chennai, India
| | - Jegan Sekar
- Microbiology Lab, Biotechnology Programme, M. S. Swaminathan Research Foundation, Chennai, India
| | - Anu D Arunkumar
- Microbiology Lab, Biotechnology Programme, M. S. Swaminathan Research Foundation, Chennai, India
| | - Prabavathy V Ramalingam
- Microbiology Lab, Biotechnology Programme, M. S. Swaminathan Research Foundation, Chennai, India
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Feng K, Lin Y, Guo J, Ye Z, Zhang Y, Ma Q, Shao Y, Chen K, Zhuang J, Lin D, Lin T. Study on the enhanced electron-hole separation capability of Ir xZn 1-xO/Ti electrodes with high photoelectrocatalysis efficiency. JOURNAL OF HAZARDOUS MATERIALS 2020; 393:122488. [PMID: 32193133 DOI: 10.1016/j.jhazmat.2020.122488] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 03/03/2020] [Accepted: 03/05/2020] [Indexed: 06/10/2023]
Abstract
Making full use of low-energy photons and reducing photogenerated carriers' recombination rate have been considered important ways to raise photoelectrocatalysis (PEC) efficiency. In this study, Ir-doped ZnO PEC electrodes were prepared by thermal decomposition method, first principles calculations were used to study the effects of Ir content on the electronic structure and optical properties of IrxZn1-xO coatings, the PEC degradation mechanism of the IrxZn1-xO/Ti electrodes was also tentatively presented. The results indicated that with numbers of Zn atoms replaced by Ir atoms, impurity energy level appeared in ZnO band gap, which reduced the electron transition barriers and increased the number of photogenerated carriers. Besides, IrO2 nanoparticles covered on ZnO nanorods surface, acting as highly efficient electron transfer channels and electrocatalytic active sites, could separate photogenerated electron-hole pairs and enhance PEC performance effectively. PEC performance of IrxZn1-xO/Ti electrodes with different Ir contents under UV irradiation was evaluated by rhodamine B (RhB) removal rate. Compared with pure ZnO electrodes, IrxZn1-xO/Ti ones exhibited much stronger degradation capacity. Specifically, Ir0.09375Zn0.90625O/Ti electrodes showed the highest degradation rate of 99.4 %, and a relatively high rate of 95.2 % after working 100 h continuously, indicating its excellent long-term stability.
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Affiliation(s)
- Keke Feng
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Yuting Lin
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Jie Guo
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Zhanghao Ye
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Yanbin Zhang
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Qiongqiong Ma
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Yanqun Shao
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Kongfa Chen
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, Fujian 350108, China.
| | - Jianhuang Zhuang
- Putian Power Supply Company of State Grid Fujian Electric Power Co. Ltd., Putian, Fujian 351100, China.
| | - Deyuan Lin
- Electric Power Research Institute of State Grid Fujian Electric Power Co. Ltd., Fuzhou, Fujian 350007, China.
| | - Tianshun Lin
- Putian Power Supply Company of State Grid Fujian Electric Power Co. Ltd., Putian, Fujian 351100, China.
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9
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Fernandez M, Paulucci NS, Reynoso E, Morales GM, Agostini E, González PS. Morphological and structural response of Bacillus sp. SFC 500-1E after Cr(VI) and phenol treatment. J Basic Microbiol 2020; 60:679-690. [PMID: 32378234 DOI: 10.1002/jobm.202000076] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 04/04/2020] [Accepted: 04/22/2020] [Indexed: 11/10/2022]
Abstract
Bacillus sp. SFC 500-1E, a bacterial strain isolated from tannery sediments, is able to remove Cr(VI) and simultaneously tolerate high concentrations of phenol. In this study, we used high-resolution microscopies, fluorescence polarization techniques, and several biochemical approaches to improve our understanding about the adaptive mechanisms of this strain to survive in the presence of Cr(VI) and phenol, both individually and simultaneously. Among adaptive strategies developed by Bacillus sp. SFC 500-1E, an increase in bacterial size, such as length, width, and height, and ultrastructural alterations, such as electron-dense precipitates, the presence of exopolymers, and cell lysis, are noteworthy. The exopolymers observed were consistent with the extensive biofilm formation and exopolysaccharides and extracellular protein quantification. At the cell membrane level, a rapid rigidity was induced in Cr(VI) + phenol treatment. This effect was counteracted after 16 h by changes at the level of phospholipids, mainly in the composition of fatty acids (FAs); in particular, an increase in the unsaturated fatty acid/saturated fatty acid ratio was detected. This study shows evidence of some adaptive responses displayed by Bacillus sp. SFC 500-1E, which allows it to survive in stressful conditions.
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Affiliation(s)
- Marilina Fernandez
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.,CONICET-UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina
| | - Natalia S Paulucci
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.,CONICET-UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina
| | - Eugenia Reynoso
- Departamento de Química- FCEFQyN, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.,CONICET-UNRC, Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA), Río Cuarto, Córdoba, Argentina
| | - Gustavo M Morales
- Departamento de Química- FCEFQyN, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.,CONICET-UNRC, Instituto de Investigaciones en Tecnologías Energéticas y Materiales Avanzados (IITEMA), Río Cuarto, Córdoba, Argentina
| | - Elizabeth Agostini
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.,CONICET-UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina
| | - Paola S González
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, Río Cuarto, Córdoba, Argentina.,CONICET-UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina
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10
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Perotti R, Paisio CE, Agostini E, Fernandez MI, González PS. CR(VI) phytoremediation by hairy roots of Brassica napus: assessing efficiency, mechanisms involved, and post-removal toxicity. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:9465-9474. [PMID: 31919819 DOI: 10.1007/s11356-019-07258-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/14/2018] [Accepted: 12/02/2019] [Indexed: 06/10/2023]
Abstract
Industrial activities such as leather tanning involve the use of highly toxic inorganic pollutants, like Chromium (Cr). This work evaluated Cr(VI) remediation by hairy roots (HR) of Brassica napus, paying close attention to the mechanisms involved and the toxicity of post-removal solutions. Results showed that these roots were capable of tolerating concentrations of up to 10 mg L-1 Cr(VI), while higher concentrations were toxic for HR development. Removal efficiency was assessed through the use of synthetic solutions containing different initial Cr(VI) concentrations (2, 5, or 10 mg L-1). Regardless of these initial concentrations, the highest removal efficiency values were between 80 and 90% after 24 and 48 h of treatment, using a 2.0 g inoculum. The mechanisms involved were Cr accumulation (60%) and to a lesser extent, adsorption to the root biomass (30%). A fraction of Cr(VI) was intracellularly reduced to Cr(III), which suggests reductases may have played a role. Additionally, post-removal toxicity was evaluated through two bioassays (Lactuca sativa L. and AMPHITOX test) after the removal of 10 mg L-1 Cr(VI). The treated solutions showed moderate phytotoxicity for L. sativa L. and no toxicity for R arenarum. The ability of HR to remove 10 mg L-1 Cr(VI) from real tannery effluents collected from a regional industry (Córdoba province, Argentina) was also determined. The high removal efficiency observed (98%) demonstrates this system can be successful in treating complex wastewaters.
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Affiliation(s)
- Romina Perotti
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, Ruta 36 Km 601. CP 5800, Río Cuarto, Cba, Argentina
| | - Cintia Elizabeth Paisio
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, Ruta 36 Km 601. CP 5800, Río Cuarto, Cba, Argentina
| | - Elizabeth Agostini
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, Ruta 36 Km 601. CP 5800, Río Cuarto, Cba, Argentina
| | - María Inés Fernandez
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, Ruta 36 Km 601. CP 5800, Río Cuarto, Cba, Argentina
| | - Paola Solange González
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, Ruta 36 Km 601. CP 5800, Río Cuarto, Cba, Argentina.
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11
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Fernandez M, Pereira PP, Agostini E, González PS. How the bacterial community of a tannery effluent responds to bioaugmentation with the consortium SFC 500-1. Impact of environmental variables. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 247:46-56. [PMID: 31229785 DOI: 10.1016/j.jenvman.2019.06.055] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 05/17/2019] [Accepted: 06/11/2019] [Indexed: 06/09/2023]
Abstract
Bioaugmentation with the consortium SFC 500-1 is a promising alternative to remediate wastewaters, such as tannery effluents. With the aim of assessing the changes produced in response to bioaugmentation, bacterial 16S rDNA genes were sequenced with Illumina MiSeq Platform. Additionally, bacterial and fungal groups were analyzed through standard culture dependent methods. The impact of diverse physico-chemical and microbiological parameters on the prokaryotic diversity was also evaluated throughout. Bacteroidetes, Firmicutes and Proteobacteria, represented together up to 91% of the total number of sequences obtained from the tannery effluent. Diversity decreased immediately after inoculation, due to an increase in the representation of the taxa to which the added consortium belongs. However, bioaugmentation produced no greater variations since only a 10% of unique operational taxonomic units were found in the inoculated treatment. An increase in the abundance of Myroides and a reduction in the representation of Proteiniclasticum and Halomonas were major observed variations. On the other hand, pH and dissolved oxygen constituted main environmental factors affecting the structure of the prokaryotic communities. In all treatments yeasts increased over time, to the detriment of filamentous fungi. Together, data from this report may contribute to the development of improved bioremediation strategies of industrial wastewaters.
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Affiliation(s)
- Marilina Fernandez
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina; CONICET, UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina.
| | - Paola P Pereira
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina; CONICET, UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina.
| | - Elizabeth Agostini
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina; CONICET, UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina.
| | - Paola S González
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina; CONICET, UNRC, Instituto de Biotecnología Ambiental y Salud (INBIAS), Río Cuarto, Córdoba, Argentina.
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12
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Fernandez M, Paulucci NS, Peppino Margutti M, Biasutti AM, Racagni GE, Villasuso AL, Agostini E, González PS. Membrane Rigidity and Phosphatidic Acid (PtdOH) Signal: Two Important Events in Acinetobacter guillouiae SFC 500-1A Exposed to Chromium(VI) and Phenol. Lipids 2019; 54:557-570. [PMID: 31475368 DOI: 10.1002/lipd.12187] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 07/31/2019] [Accepted: 07/31/2019] [Indexed: 11/06/2022]
Abstract
The remodeling of membrane lipids is a mechanism that allows microorganisms to survive in unfavorable environments such as industrial effluents, which often contain inorganic and organic pollutants, like chromium and phenol. In the present work, we evaluated the effect of Cr(VI) and phenol on the membrane of Acinetobacter guillouiae SFC 500-1A, a bacterial strain isolated from tannery sediments where such pollutants can be found. The presence of lipid kinases and phospholipases and the changes in their activities under exposure to these pollutants were determined. Cr(VI) and Cr(VI) + phenol caused the membrane to become more rigid for up to 16 h after exposure. This could be due to an increase in cardiolipin (Ptd2 Gro) and a decrease in phosphatidylethanolamine (PtdEtn), which are indicative of more order and rigidity in the membrane. Increased phospholipase A activity (PLA, EC 3.1.1.4) could be responsible for the decrease in PtdEtn levels. Moreover, our results indicate that Cr(VI) and Cr(VI) + phenol trigger the phosphatidic acid (PtdOH) signal. The finding of significantly increased phosphatidylinositol-4-phosphate (PtdIns-4-P) levels means this is likely achieved via PtdIns-PLC/DGK. This report provides the first evidence that A. guillouiae SFC 500-1A is able to sense Cr(VI) and phenol, transduce this signal through changes in the physical state of the membrane, and trigger lipid-signaling events.
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Affiliation(s)
- Marilina Fernandez
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Natalia S Paulucci
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Micaela Peppino Margutti
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Alicia M Biasutti
- Departamento de Química-FCEFQyN, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Graciela E Racagni
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Ana L Villasuso
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Elizabeth Agostini
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
| | - Paola S González
- Departamento de Biología Molecular, Universidad Nacional de Río Cuarto, 5800, Río Cuarto, Córdoba, Argentina
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13
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Fernandez M, Paisio CE, Perotti R, Pereira PP, Agostini E, González PS. Laboratory and field microcosms as useful experimental systems to study the bioaugmentation treatment of tannery effluents. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 234:503-511. [PMID: 30648649 DOI: 10.1016/j.jenvman.2019.01.019] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 01/02/2019] [Accepted: 01/06/2019] [Indexed: 06/09/2023]
Abstract
Tannery effluents require effective treatment prior to their final disposal, and the use of native bacterial consortia could be an appropriate strategy for this purpose. In the present work, consortium SFC 500-1 was found to be highly tolerant to different metals, metalloids and aromatic compounds like phenols. It was also able to remove the black dye commonly used in tanneries. Moreover, it promoted a significant reduction in chemical oxygen demand and exhibited high capability for the simultaneous removal of Cr(VI) and phenol. However, the effectiveness of the remediation processes markedly varied from one experimental system (Erlenmeyer flasks) to another (field microcosm system), highlighting the importance of moving from a small-scale study system to one involving more realistic environmental scenarios. In addition, we found a decrease in the toxicity of the effluent treated with consortium SFC 500-1. Taken together, our results indicate that this consortium possesses great potential for the treatment of tannery effluents. We conclude that for the development of a bioremediation strategy, it is necessary to develop experiments at a larger scale under conditions similar to those of the original system, in order to complete the scenario first created by in vitro approaches.
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Affiliation(s)
- Marilina Fernandez
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina.
| | - Cintia E Paisio
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina.
| | - Romina Perotti
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina.
| | - Paola P Pereira
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina.
| | - Elizabeth Agostini
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina.
| | - Paola S González
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto, 5800 Río Cuarto, Córdoba, Argentina.
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14
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Sánchez-González M, Álvarez-Uribe H, Rivera-Solís R, González-Burgos A, Escalante-Réndiz D, Rojas-Herrera R. Analysis of a phenol-adapted microbial community: degradation capacity, taxonomy and metabolic description. J Appl Microbiol 2019; 126:771-779. [DOI: 10.1111/jam.14166] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Revised: 11/13/2018] [Accepted: 11/19/2018] [Indexed: 12/24/2022]
Affiliation(s)
- M. Sánchez-González
- Facultad de Ingeniería Química; Universidad Autónoma de Yucatán; Mérida, Yucatán México
| | - H. Álvarez-Uribe
- Facultad de Ingeniería Química; Universidad Autónoma de Yucatán; Mérida, Yucatán México
| | - R. Rivera-Solís
- Facultad de Ingeniería Química; Universidad Autónoma de Yucatán; Mérida, Yucatán México
| | - A. González-Burgos
- Facultad de Ingeniería Química; Universidad Autónoma de Yucatán; Mérida, Yucatán México
| | - D. Escalante-Réndiz
- Facultad de Ingeniería Química; Universidad Autónoma de Yucatán; Mérida, Yucatán México
| | - R. Rojas-Herrera
- Facultad de Ingeniería Química; Universidad Autónoma de Yucatán; Mérida, Yucatán México
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15
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Ontañon OM, Landi C, Carleo A, Gagliardi A, Bianchi L, González PS, Agostini E, Bini L. What makes A. guillouiae SFC 500-1A able to co-metabolize phenol and Cr(VI)? A proteomic approach. JOURNAL OF HAZARDOUS MATERIALS 2018; 354:215-224. [PMID: 29753190 DOI: 10.1016/j.jhazmat.2018.04.068] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2017] [Revised: 04/24/2018] [Accepted: 04/25/2018] [Indexed: 06/08/2023]
Abstract
Acinetobacter guillouiae SFC 500-1A is an environmental bacterium able to efficiently co-remediate phenol and Cr(VI). To further understand the molecular mechanisms triggered in this strain during the bioremediation process, variations in the proteomic profile after treatment with phenol and phenol plus Cr(VI) were evaluated. The proteomic analysis revealed the induction of the β-ketoadipate pathway for phenol oxidation and the assimilation of degradation products through TCA cycle and glyoxylate shunt. Phenol exposure increased the abundance of proteins associated to energetic processes and ATP synthesis, but it also triggered cellular stress. The lipid bilayer was suggested as a target of phenol toxicity, and changing fatty acids composition seemed to be the bacterial response to protect the membrane integrity. The involvement of two flavoproteins in Cr(VI) reduction to Cr(III) was also proposed. The results suggested the important role of chaperones, antioxidant response and SOS-induced proteins in the ability of the strain to mitigate the damage generated by phenol and Cr(VI). This research contributes to elucidate the mechanisms involved in A. guillouiae SFC 500-1A tolerance and co-remediation of phenol and Cr(VI). Such information may result useful not only to improve its bioremediation efficiency but also to identify putative markers of resistance in environmental bacteria.
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Affiliation(s)
- Ornella Mailén Ontañon
- Department of Molecular Biology, National University of Rio Cuarto, Córdoba, Argentina; National Council for Scientific and Technological Research (CONICET), Argentina.
| | - Claudia Landi
- Laboratory of Functional Proteomics, Department of Life Sciences, University of Siena, Siena, Italy
| | - Alfonso Carleo
- Laboratory of Functional Proteomics, Department of Life Sciences, University of Siena, Siena, Italy; Current address: Department of Pulmonology, Hannover Medical School, Hannover, Germany
| | - Assunta Gagliardi
- Laboratory of Functional Proteomics, Department of Life Sciences, University of Siena, Siena, Italy; Current address: Centre for Integrative Biology (CIBIO), University of Trento, Trento, Italy
| | - Laura Bianchi
- Laboratory of Functional Proteomics, Department of Life Sciences, University of Siena, Siena, Italy
| | - Paola Solange González
- Department of Molecular Biology, National University of Rio Cuarto, Córdoba, Argentina; National Council for Scientific and Technological Research (CONICET), Argentina
| | - Elizabeth Agostini
- Department of Molecular Biology, National University of Rio Cuarto, Córdoba, Argentina; National Council for Scientific and Technological Research (CONICET), Argentina
| | - Luca Bini
- Laboratory of Functional Proteomics, Department of Life Sciences, University of Siena, Siena, Italy
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16
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Ontañon OM, Fernandez M, Agostini E, González PS. Identification of the main mechanisms involved in the tolerance and bioremediation of Cr(VI) by Bacillus sp. SFC 500-1E. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:16111-16120. [PMID: 29594905 DOI: 10.1007/s11356-018-1764-1] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/21/2017] [Accepted: 03/13/2018] [Indexed: 06/08/2023]
Abstract
Chromium pollution is a problem that affects different areas worldwide and, therefore, must be solved. Bioremediation is a promising alternative to treat environmental contamination, but finding bacterial strains able to tolerate and remove different contaminants is a major challenge, since most co-polluted sites contain mixtures of organic and inorganic substances. In the present work, Bacillus sp. SFC 500-1E, isolated from the bacterial consortium SFC 500-1 native to tannery sediments, showed tolerance to various concentrations of different phenolic compounds and heavy metals, such as Cr(VI). This strain was able to efficiently remove Cr(VI), even in the presence of phenol. The detection of the chrA gene suggested that Cr(VI) extrusion could be a mechanism that allowed this strain to tolerate the heavy metal. However, reduction through cytosolic NADH-dependent chromate reductases may be the main mechanism involved in the remediation. The information provided in this study about the mechanisms through which Bacillus sp. SFC 500-1E removes Cr(VI) should be taken into account for the future application of this strain as a possible candidate to remediate contaminated environments.
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Affiliation(s)
- Ornella M Ontañon
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina
| | - Marilina Fernandez
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina
| | - Elizabeth Agostini
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina
| | - Paola S González
- Departamento de Biología Molecular, FCEFQyN, Universidad Nacional de Río Cuarto (UNRC), Ruta 36 Km 601, CP 5800, Río Cuarto, Córdoba, Argentina.
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17
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Silva JRO, Santos DS, Santos UR, Eguiluz KIB, Salazar-Banda GR, Schneider JK, Krause LC, López JA, Hernández-Macedo ML. Electrochemical and/or microbiological treatment of pyrolysis wastewater. CHEMOSPHERE 2017; 185:145-151. [PMID: 28688848 DOI: 10.1016/j.chemosphere.2017.06.133] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2017] [Revised: 06/05/2017] [Accepted: 06/29/2017] [Indexed: 05/23/2023]
Abstract
Electrochemical oxidation may be used as treatment to decompose partially or completely organic pollutants (wastewater) from industrial processes such as pyrolysis. Pyrolysis is a thermochemical process used to obtain bio-oil from biomasses, generating a liquid waste rich in organic compounds including aldehydes and phenols, which can be submitted to biological and electrochemical treatments in order to minimize its environmental impact. Thus, electrochemical systems employing dimensionally stable anodes (DSAs) have been proposed to enable biodegradation processes in subsurface environments. In order to investigate the organic compound degradation from residual coconut pyrolysis wastewater, ternary DSAs containing ruthenium, iridium and cerium synthetized by the 'ionic liquid method' at different calcination temperatures (500, 550, 600 and 700 °C) for the pretreatment of these compounds, were developed in order to allow posterior degradation by Pseudomonas sp., Bacillus sp. or Acinetobacter sp. bacteria. The electrode synthesized applying 500 °C displayed the highest voltammetric charge and was used in the pretreatment of pyrolysis effluent prior to microbial treatment. Regarding biological treatment, the Pseudomonas sp. exhibited high furfural degradation in wastewater samples electrochemically pretreated at 2.0 V. On the other hand, the use of Acinetobacter efficiently degraded phenolic compounds such as phenol, 4-methylphenol, 2,5-methylphenol, 4-ethylphenol and 3,5-methylphenol in both wastewater samples, with and without electrochemical pretreatment. Overall, the results indicate that the combination of both processes used in this study is relevant for the treatment of pyrolysis wastewater.
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Affiliation(s)
- José R O Silva
- Laboratório de Biologia Molecular, Instituto de Tecnologia e Pesquisa, Universidade Tiradentes, Aracaju, SE, Brazil
| | - Dara S Santos
- Laboratório de Eletroquímica e Nanotecnologia, Instituto de Tecnologia e Pesquisa, Universidade Tiradentes, Aracaju, SE, Brazil
| | - Ubiratan R Santos
- Laboratório de Biologia Molecular, Instituto de Tecnologia e Pesquisa, Universidade Tiradentes, Aracaju, SE, Brazil
| | - Katlin I B Eguiluz
- Laboratório de Eletroquímica e Nanotecnologia, Instituto de Tecnologia e Pesquisa, Universidade Tiradentes, Aracaju, SE, Brazil
| | - Giancarlo R Salazar-Banda
- Laboratório de Eletroquímica e Nanotecnologia, Instituto de Tecnologia e Pesquisa, Universidade Tiradentes, Aracaju, SE, Brazil
| | - Jaderson K Schneider
- Laboratório de Química Analítica, Ambiental e Oleoquímica, Instituto de Química, Universidade Federal do Rio Grande do Sul, Porto Alegre, RS, Brazil
| | - Laiza C Krause
- Laboratório de Síntese de Materiais e Cromatografia, Instituto de Tecnologia e Pesquisa, Universidade Tiradentes, Aracaju, SE, Brazil
| | - Jorge A López
- Laboratório de Biologia Molecular, Instituto de Tecnologia e Pesquisa, Universidade Tiradentes, Aracaju, SE, Brazil
| | - Maria L Hernández-Macedo
- Laboratório de Biologia Molecular, Instituto de Tecnologia e Pesquisa, Universidade Tiradentes, Aracaju, SE, Brazil.
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18
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Ontañon OM, González PS, Barros GG, Agostini E. Improvement of simultaneous Cr(VI) and phenol removal by an immobilised bacterial consortium and characterisation of biodegradation products. N Biotechnol 2017; 37:172-179. [DOI: 10.1016/j.nbt.2017.02.003] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 07/26/2016] [Accepted: 02/12/2017] [Indexed: 10/20/2022]
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