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Xue ZF, Cheng WC, Wang L, Xie YX, Qin P, Shi C. Immobilizing lead in aqueous solution and loess soil using microbially induced carbonate/phosphate precipitation (MICP/MIPP) under harsh pH environments. JOURNAL OF HAZARDOUS MATERIALS 2024; 480:135884. [PMID: 39298970 DOI: 10.1016/j.jhazmat.2024.135884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Revised: 08/23/2024] [Accepted: 09/16/2024] [Indexed: 09/22/2024]
Abstract
The bioaccumulation of heavy metals due to metallurgical and smelting activities threatens human health. Although microbial-induced carbonate/phosphate precipitation (MICP/MIPP) technology has been applied to heavy metal remediation, the relative merits of MICP and MIPP, especially under extreme pH environments, have not yet been documented. In this study, Sporosarcina pasteurii (SP)-based MICP and Bacillus megaterium (BM)-based MIPP were applied to immobilize lead (Pb) in aqueous solution and loess soil. The results showed that the BM retained a strong phosphorolysis ability when under strongly acidic conditions, while the ureolysis ability of SP approached zero. Furthermore, the bioprecipitates obtained under BM-based MIPP had a denser appearance, presumably due to the enrichment of calcite and apatite crystals. The results also showed that Pb immobilization was achieved through bacterial adsorption, the chelate function of sodium glycerophosphate (SGP), large organic matter complexation, and biomineralization through the MICP/MIPP mechanism. Under SP-based MICP, SP and large organic matter immobilized Pb2+ at rates of 17.6 % and 31.7 %, respectively, while under BM-based MIPP, BM, organic matter, and SGP immobilized Pb2+ at rates of 21.5 %, 23.4 %, and 48.5 % respectively. The MICP and MIPP mechanisms dominated Pb immobilization at rates of 78.6 % and 99.6 %, respectively.
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Affiliation(s)
- Zhong-Fei Xue
- School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering (XAUAT), Xi'an 710055, China.
| | - Wen-Chieh Cheng
- School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering (XAUAT), Xi'an 710055, China.
| | - Lin Wang
- School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering (XAUAT), Xi'an 710055, China.
| | - Yi-Xin Xie
- School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering (XAUAT), Xi'an 710055, China.
| | - Peng Qin
- School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering (XAUAT), Xi'an 710055, China.
| | - Cong Shi
- School of Civil Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, China; Shaanxi Key Laboratory of Geotechnical and Underground Space Engineering (XAUAT), Xi'an 710055, China.
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Sharma M, Sharma S, Paavan, Gupta M, Goyal S, Talukder D, Akhtar MS, Kumar R, Umar A, Alkhanjaf AAM, Baskoutas S. Mechanisms of microbial resistance against cadmium - a review. JOURNAL OF ENVIRONMENTAL HEALTH SCIENCE & ENGINEERING 2024; 22:13-30. [PMID: 38887775 PMCID: PMC11180082 DOI: 10.1007/s40201-023-00887-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/18/2023] [Accepted: 11/15/2023] [Indexed: 06/20/2024]
Abstract
The escalating cadmium influx from industrial activities and anthropogenic sources has raised serious environmental concerns due to its toxic effects on ecosystems and human health. This review delves into the intricate mechanisms underlying microbial resistance to cadmium, shedding light on the multifaceted interplay between microorganisms and this hazardous heavy metal. Cadmium overexposure elicits severe health repercussions, including renal carcinoma, mucous membrane degradation, bone density loss, and kidney stone formation in humans. Moreover, its deleterious impact extends to animal and plant metabolism. While physico-chemical methods like reverse osmosis and ion exchange are employed to mitigate cadmium contamination, their costliness and incomplete efficacy necessitate alternative strategies. Microbes, particularly bacteria and fungi, exhibit remarkable resilience to elevated cadmium concentrations through intricate resistance mechanisms. This paper elucidates the ingenious strategies employed by these microorganisms to combat cadmium stress, encompassing metal ion sequestration, efflux pumps, and enzymatic detoxification pathways. Bioremediation emerges as a promising avenue for tackling cadmium pollution, leveraging microorganisms' ability to transform toxic cadmium forms into less hazardous derivatives. Unlike conventional methods, bioremediation offers a cost-effective, environmentally benign, and efficient approach. This review amalgamates the current understanding of microbial cadmium resistance mechanisms, highlighting their potential for sustainable remediation strategies. By unraveling the intricate interactions between microorganisms and cadmium, this study contributes to advancing our knowledge of bioremediation approaches, thereby paving the way for safer and more effective cadmium mitigation practices.
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Affiliation(s)
- Monu Sharma
- Department of Biosciences and Technology, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, 133207 Haryana India
| | - Sonu Sharma
- Department of Biosciences and Technology, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, 133207 Haryana India
| | - Paavan
- Department of Biotechnology, Ambala College of Engineering and Applied Research, Devsthali, Ambala, 133101 Haryana India
| | - Mahiti Gupta
- Department of Biosciences and Technology, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, 133207 Haryana India
| | - Soniya Goyal
- Department of Biosciences and Technology, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, 133207 Haryana India
| | - Daizee Talukder
- Department of Biosciences and Technology, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, 133207 Haryana India
| | - Mohd. Sayeed Akhtar
- Department of Botany, Gandhi Faiz-E-Aam College, Shahjahanpur, 242001 Uttar Pradesh India
| | - Raman Kumar
- Department of Biosciences and Technology, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, 133207 Haryana India
| | - Ahmad Umar
- Department of Chemistry, Faculty of Science and ArtsPromising Centre for Sensors and Electronic Devices (PCSED), Najran University, Najran, 11001 Kingdom of Saudi Arabia
- Department of Materials Science and Engineering, The Ohio State University, Columbus, OH 43210 USA
| | - Abdulrab Ahmed M. Alkhanjaf
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences, Najran University, 11001 Najran, Saudi Arabia
| | - Sotirios Baskoutas
- Department of Materials Science, University of Patras, 26500 Patras, Greece
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Zhang Y, Yin Q, Guo L, Guo J, Chen Y, Li M. Chicken manure-derived biochar enhanced the potential of Comamonas testosteroni ZG2 to remediate Cd contaminated soil. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2024; 46:198. [PMID: 38695979 DOI: 10.1007/s10653-024-01956-x] [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: 10/30/2023] [Accepted: 03/13/2024] [Indexed: 06/17/2024]
Abstract
The combined remediation of Cd-contaminated soil using biochar and microorganisms has a good application value. In this study, the effect of chicken manure-derived biochar on CdCO3 precipitation induced by Comamonas testosteroni ZG2 was investigated. The results showed that biochar could be used as the carrier of strain ZG2, enhance the resistance of strain ZG2 to Cd, and reduce the toxicity of Cd to bacterial cells. Cd adsorbed by biochar could be induced by strain ZG2 to form CdCO3 precipitation. Strain ZG2 could also induce CdCO3 precipitation when biochar was added during precipitation formation and fermentation broth formation. The CdCO3 precipitation could enter the pores of the biochar and attach to the surface of the biochar. The single and combined effects of strain ZG2 and biochar could realize the remediation of Cd-contaminated soil to a certain extent. The overall effect was in the order of strain ZG2 with biochar > biochar > strain ZG2. The combination of strain ZG2 and biochar reduced soil available Cd by 48.2%, the aboveground biomass of pakchoi increased by 72.1%, and the aboveground Cd content decreased by 73.3%. At the same time, it promoted the growth and development of the root system and improved the microbial community structure of the rhizosphere soil. The results indicated that chicken manure-derived biochar could enhance the stability of CdCO3 precipitation induced by strain ZG2, and strain ZG2 combined with biochar could achieve a more stable remediation effect on Cd-contaminated soil.
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Affiliation(s)
- Yu Zhang
- College of Resources and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Qiuxia Yin
- College of Resources and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Lingling Guo
- Microbial Research Institute of Liaoning Province, Chaoyang, 122000, China
| | - Jiayi Guo
- College of Resources and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Yuanhui Chen
- College of Resources and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Mingtang Li
- College of Resources and Environment, Jilin Agricultural University, Changchun, 130118, China.
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Diez-Marulanda JC, Brandão PFB. Potential use of two Serratia strains for cadmium remediation based on microbiologically induced carbonate precipitation and their cadmium resistance. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024; 31:5319-5330. [PMID: 38114705 DOI: 10.1007/s11356-023-31062-x] [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: 05/16/2023] [Accepted: 11/11/2023] [Indexed: 12/21/2023]
Abstract
Cadmium (Cd) presence and bioavailability in soils is a serious concern for cocoa producers. Cocoa plants can bioaccumulate Cd that can reach humans through the food chain, thus posing a threat to human health, as Cd is a highly toxic metal. Currently, microbiologically induced carbonate precipitation (MICP) by the ureolytic path has been proposed as an effective technique for Cd remediation. In this work, the Cd remediation potential and Cd resistance of two ureolytic bacteria, Serratia sp. strains 4.1a and 5b, were evaluated. The growth of both Serratia strains was inhibited at 4 mM Cd(II) in the culture medium, which is far higher than the Cd content that can be found in the soils targeted for remediation. Regarding removal efficiency, for an initial concentration of 0.15 mM Cd(II) in liquid medium, the maximum removal percentages for Serratia sp. 4.1.a and 5b were 99.3% and 99.57%, respectively. Their precipitates produced during Cd removal were identified as calcite by X-ray diffraction. Energy dispersive X-ray spectroscopy analysis showed that a portion of Cd was immobilized in this matrix. Finally, the presence of a partial gene from the czc operon, involved in Cd resistance, was observed in Serratia sp. 5b. The expression of this gene was found to be unaffected by the presence of Cd(II), and upregulated in the presence of urea. This work is one of the few to report the use of bacterial strains of the Serratia genus for Cd remediation by MICP, and apparently the first one to report differential expression of a Cd resistance gene due to the presence of urea.
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Affiliation(s)
- Juan C Diez-Marulanda
- Universidad Nacional de Colombia - Sede Bogotá, Facultad de Ciencias, Departamento de Química, Grupo de Estudios para la Remediación y Mitigación de Impactos Negativos al Ambiente (GERMINA), Av. Carrera 30 # 45-03, 111321, Bogotá, Colombia.
| | - Pedro F B Brandão
- Universidad Nacional de Colombia - Sede Bogotá, Facultad de Ciencias, Departamento de Química, Grupo de Estudios para la Remediación y Mitigación de Impactos Negativos al Ambiente (GERMINA), Av. Carrera 30 # 45-03, 111321, Bogotá, Colombia
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Han LJ, Li JS, Chen Z, Xue Q. Stabilization of Pb(II) in wastewater and tailings by commercial bacteria through microbially induced phosphate precipitation (MIPP). THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 868:161628. [PMID: 36657686 DOI: 10.1016/j.scitotenv.2023.161628] [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: 11/01/2022] [Revised: 12/20/2022] [Accepted: 01/11/2023] [Indexed: 06/17/2023]
Abstract
Microbially induced phosphate precipitation (MIPP) is an effective and eco-friendly method for Pb(II) stabilization. The phosphate-solubilizing microorganisms (PSM) for MIPP are commonly isolated from Pb(II)-contaminated sites through a series of intricate and time-consuming enrichment and purification processes. This research used ready-made commercial bacteria to develop a simple MIPP process. Bacillus subtilis (BS, CCTCC AB 98002) was selected from two commercial PSM strains owing to more effective Pb(II) removal. Compared to the most isolated microorganisms, BS released more than twice as much inorganic phosphorus (Pi) as well as had a high-level Pb(II) tolerance. BS could remove >99% of Pb(II) from 500 mg/L Pb(II)-containing water at the optimal 0.05 M sodium glycerophosphate (SGP), pH 7-9, and ≤0.03 M MgCl2, outperforming most isolated microorganisms. In addition, BS could mitigate the contamination risk of the lead‑zinc tailings, by reducing the readily leachable Pb(II) concentration from 0.81 mg/L (over the regulatory limit of 0.1 mg/L) to 0.00042 mg/L. The unstable Pb(II) in the solution and tailings was ultimately stabilized to Pb5(PO4)3Cl after the SGP phosphorlysis and phosphate precipitation processes. In conclusion, commercial BS is a superior alternative to isolated microorganisms for MIPP on Pb(II) stabilization. The simple-processed and high-effective BS-based MIPP provides the MIPP method a new insight for widespread implementation in the remediation of heavy metals-containing wastewater, soil, and waste.
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Affiliation(s)
- Li-Jun Han
- State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; University of Chinese Academy of Science, Beijing 100049, China
| | - Jiang-Shan Li
- State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China; IRSM-CAS/HK PolyU Joint Laboratory on Solid Waste Science, Wuhan 430071, China.
| | - Zhen Chen
- State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China
| | - Qiang Xue
- State Key Laboratory of Geomechanics and Geotechnical Engineering, Institute of Rock and Soil Mechanics, Chinese Academy of Sciences, Wuhan 430071, China.
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Diez-Marulanda JC, Brandão PFB. Isolation of urease-producing bacteria from cocoa farms soils in Santander, Colombia, for cadmium remediation. 3 Biotech 2023; 13:98. [PMID: 36860360 PMCID: PMC9968674 DOI: 10.1007/s13205-023-03495-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Accepted: 01/25/2023] [Indexed: 03/01/2023] Open
Abstract
Cadmium (Cd) is a toxic heavy metal that causes serious health problems and is present in agriculturally important soils in Colombia, such as the ones used for cocoa farming. Recently, the use of ureolytic bacteria by the Microbiologically Induced Carbonate Precipitation (MICP) activity has been proposed as an alternative to mitigate the availability of Cd in contaminated soils. In this study, 12 urease-positive bacteria able to grow in the presence of Cd(II) were isolated and identified. Three were selected based on urease activity, precipitates formation and growth, with two belonging to the genus Serratia (codes 4.1a and 5b) and one to Acinetobacter (code 6a). These isolates exhibited low urease activity levels (3.09, 1.34 and 0.31 μmol mL-1 h-1, respectively), but could raise the pH to values close to 9.0 and to produce carbonate precipitates. It was shown that the presence of Cd affects the growth of the selected isolates. However, urease activity was not negatively influenced. In addition, the three isolates were observed to efficiently remove Cd from solution. The two Serratia isolates presented maximum removals of 99.70% and 99.62%, with initial 0.05 mM Cd(II) in the culture medium (supplemented with urea and Ca(II)) at 30 °C and 144 h of incubation. For the Acinetobacter isolate, the maximum removal was 91.23% at the same conditions. Thus, this study evidences the potential use of these bacteria for bioremediation treatments in samples contaminated with Cd, and it is one of the few reports that shows the high cadmium removal capacity of bacteria from the genus Serratia. Supplementary Information The online version contains supplementary material available at 10.1007/s13205-023-03495-1.
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Affiliation(s)
- Juan C. Diez-Marulanda
- Universidad Nacional de Colombia, Sede Bogotá, Facultad de Ciencias, Departamento de Química, Grupo de Estudios para la Remediación y Mitigación de Impactos Negativos al Ambiente (GERMINA), Av. Carrera 30 # 45-03, 111321 Bogotá, Colombia
| | - Pedro F. B. Brandão
- Universidad Nacional de Colombia, Sede Bogotá, Facultad de Ciencias, Departamento de Química, Grupo de Estudios para la Remediación y Mitigación de Impactos Negativos al Ambiente (GERMINA), Av. Carrera 30 # 45-03, 111321 Bogotá, Colombia
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Calcareous deposit formation under cathodic polarization and marine biocalcifying bacterial activity. Bioelectrochemistry 2022; 148:108271. [DOI: 10.1016/j.bioelechem.2022.108271] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 09/13/2022] [Accepted: 09/14/2022] [Indexed: 11/22/2022]
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Tao Y, Zhang Q, Long S, Li X, Chen J, Li X. Shifts of lipid metabolites help decode immobilization of soil cadmium under reductive soil disinfestation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 829:154592. [PMID: 35314227 DOI: 10.1016/j.scitotenv.2022.154592] [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: 12/06/2021] [Revised: 02/27/2022] [Accepted: 03/11/2022] [Indexed: 06/14/2023]
Abstract
Cadmium (Cd) contamination in soil can cause serious environmental problems and threaten human health. Previous studies have shown that the reductive soil disinfestation (RSD) is regarded as an effective soil disinfection technology, which will affect the bioavailability of Cd. However, the influence of soil microorganisms and their metabolites on the morphologies of Cd during RSD treatment are still poorly understood. Here, a laboratory incubation experiment that composed of untreated soil (CK), two RSD treatments with flooded soil (FL) and added 2% bean dregs soil (BD) was conducted. After the treatment, the content of different morphologies of Cd in the soil and the molecular characteristics (the composition of the microbial community, functional enzymes and metabolites) of the soil were measured. The study found that, compared to CK treatment, the dominant phyla, such as Acidobacteria, Bacteroidetes, Firmicutes, etc., were significantly increased in BD treatment, and enzymes related to metabolism also showed noticeable enhancement. The differential accumulated metabolite (DAM) analysis revealed that the abound of lipids and lipid-like molecules involved with fatty acyls, steroids and steroid derivatives, glycerophospholipids, fatty acids and conjugates, glycerolipids, and sphingolipids were significant different among treatments. The correlation analysis showed the exchangeable fraction cadmium contents (EX-Cd) were negatively correlated with the content of glycerophospholipids and sphingolipids, and positively correlated with glycerolipids content. However, the relationship between the residual cadmium (RS-Cd) and these three metabolites was just the opposite. Compared with another two treatments, the BD treatment significantly reduced EX-Cd contents. Biological interaction network analysis indicated that the phyla Gemmatimonadetes and Proteobacteria assumed the primary responsibility for the morphological transformation of Cd through their corresponding functional enzymes. Overall, this study provided a new perspective on RSD-mediated soil Cd immobilization, and the findings should be beneficial to further applications of RSD technology on the remediation of Cd-polluted soils.
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Affiliation(s)
- Yu Tao
- Hunan Academy of Agricultural Science, Changsha 410125, China; Hunan Institute of Vegetable Research, Changsha 410125, China
| | | | - Shiping Long
- Hunan Institute of Agricultural Environment and Ecology, Changsha 410125, Hunan, China
| | - Xuefeng Li
- Hunan Institute of Vegetable Research, Changsha 410125, China
| | - Jie Chen
- Hunan Institute of Agricultural Environment and Ecology, Changsha 410125, Hunan, China.
| | - Xin Li
- Hunan Academy of Agricultural Science, Changsha 410125, China; Hunan Institute of Vegetable Research, Changsha 410125, China.
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Adsorption Performance of Cd(II) by Chitosan-Fe3O4-Modified Fish Bone Char. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19031260. [PMID: 35162286 PMCID: PMC8834754 DOI: 10.3390/ijerph19031260] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 01/19/2022] [Accepted: 01/20/2022] [Indexed: 12/04/2022]
Abstract
In order to develop a low-cost, fast, and efficient adsorbent, the fish bone charcoal B600 prepared at 600 °C was modified by chitosan (Cs) and Fe3O4 to produce the material Cs-Fe3O4-B600. Results showed that Cs-Fe3O4-B600 had magnetic responsiveness and can achieve solid–liquid separation, macropores disappeared, pore volume and specific surface area are increased, and amino functional groups appear on the surface. The adsorption process of Cd(II) by Cs-Fe3O4-B600 conformed best to the pseudo-second order kinetics model and the Langmuir model, respectively. The behavior over a whole range of adsorption was consistent with chemical adsorption being the rate-controlling step, which is a very fast adsorption process, and the isothermal adsorption is mainly monolayer adsorption, which belongs to favorable adsorption. In addition, the saturated adsorption capacity obtained for the Cs-Fe3O4-B600 to Cd(II) was 64.31 mg·g−1, which was 1.7 times than B600. The structure and morphology of Cs-Fe3O4-B600 were characterized through SEM-EDS, TEM, FTIR, and XRD, indicating that the main mechanism of Cs-Fe3O4-B600 and Cd(II) is mainly the complexation of amino groups, and it also includes part of the ion exchange between Cd(II) and Fe3O4. Therefore, Cs-Fe3O4-B600 can be employed as an effective agent for remediation of Cd contaminated water.
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Wei T, Yashir N, An F, Imtiaz SA, Li X, Li H. Study on the performance of carbonate-mineralized bacteria combined with eggshell for immobilizing Pb and Cd in water and soil. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:2924-2935. [PMID: 34382171 DOI: 10.1007/s11356-021-15138-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2021] [Accepted: 06/22/2021] [Indexed: 06/13/2023]
Abstract
Microbially induced carbonate precipitation (MICP) is an advanced bioremediation approach to remediate heavy metal (HM)-contaminated water and soil. In this study, metal-tolerant urease-producing bacterial isolates, namely, UR1, UR16, UR20, and UR21, were selected based on their urease activity. The efficiency of these isolates in water for Pb and Cd immobilizations was explored. Our results revealed that UR21 had the highest removal rates of Pb (81.9%) and Cd (65.0%) in solution within 72 h through MICP. The scanning electron microscopy-energy-dispersive x-ray and x-ray diffraction analysis confirmed the structure and the existence of PbCO3 and CdCO3 crystals in the precipitates. In addition, the strain UR21, in combination with urea/eggshell waste (EGS) or both, was further employed to investigate the effect of MICP on soil enzymatic activity, chemical fractions, and bioavailability of Pb and Cd. The outcomes indicated that the applied treatments reduced the proportion of soluble-exchangeable-Pb and -Cd, which resulted in an increment in carbonate-bound Pb and Cd in the soil. The DTPA-extractable Pb and Cd were reduced by 29.2% and 25.2% with the treatment of UR21+urea+EGS as compared to the control. Besides, the application of UR21 and EGS significantly increased the soil pH, cation exchange capacity, and enzyme activities. Our findings may provide a novel perceptive for an eco-friendly and sustainable approach to remediate heavy metal-contaminated environment through a combination of metal-resistant ureolytic bacterial strain and EGS.
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Affiliation(s)
- Ting Wei
- School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, People's Republic of China.
| | - Noman Yashir
- School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, People's Republic of China
| | - Fengqiu An
- College of Environmental and Chemical Engineering, Polytechnic University, Xi'an, 710048, China
| | - Syed Asad Imtiaz
- School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, People's Republic of China
| | - Xian Li
- School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, People's Republic of China
| | - Hong Li
- School of Environmental Science and Engineering, Shaanxi University of Science & Technology, Xi'an, 710021, People's Republic of China
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11
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Vincent J, Colin B, Lanneluc I, Sabot R, Sopéna V, Turcry P, Mahieux PY, Refait P, Jeannin M, Sablé S. New Biocalcifying Marine Bacterial Strains Isolated from Calcareous Deposits and Immediate Surroundings. Microorganisms 2021; 10:76. [PMID: 35056526 PMCID: PMC8778039 DOI: 10.3390/microorganisms10010076] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2021] [Revised: 12/24/2021] [Accepted: 12/28/2021] [Indexed: 12/04/2022] Open
Abstract
Marine bacterial biomineralisation by CaCO3 precipitation provides natural limestone structures, like beachrocks and stromatolites. Calcareous deposits can also be abiotically formed in seawater at the surface of steel grids under cathodic polarisation. In this work, we showed that this mineral-rich alkaline environment harbours bacteria belonging to different genera able to induce CaCO3 precipitation. We previously isolated 14 biocalcifying marine bacteria from electrochemically formed calcareous deposits and their immediate environment. By microscopy and µ-Raman spectroscopy, these bacterial strains were shown to produce calcite-type CaCO3. Identification by 16S rDNA sequencing provided between 98.5 and 100% identity with genera Pseudoalteromonas, Pseudidiomarina, Epibacterium, Virgibacillus, Planococcus, and Bhargavaea. All 14 strains produced carbonic anhydrase, and six were urease positive. Both proteins are major enzymes involved in the biocalcification process. However, this does not preclude that one or more other metabolisms could also be involved in the process. In the presence of urea, Virgibacillus halodenitrificans CD6 exhibited the most efficient precipitation of CaCO3. However, the urease pathway has the disadvantage of producing ammonia, a toxic molecule. We showed herein that different marine bacteria could induce CaCO3 precipitation without urea. These bacteria could then be used for eco-friendly applications, e.g., the formation of bio-cements to strengthen dikes and delay coastal erosion.
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Affiliation(s)
- Julia Vincent
- Laboratoire Littoral Environnement et Sociétés, La Rochelle Université, UMR 7266 CNRS, 17000 La Rochelle, France; (J.V.); (B.C.); (I.L.); (V.S.)
- Laboratoire des Sciences de l’Ingénieur pour l’Environnement, La Rochelle Université, UMR 7356 CNRS, 17000 La Rochelle, France; (R.S.); (P.T.); (P.-Y.M.); (P.R.)
| | - Béatrice Colin
- Laboratoire Littoral Environnement et Sociétés, La Rochelle Université, UMR 7266 CNRS, 17000 La Rochelle, France; (J.V.); (B.C.); (I.L.); (V.S.)
| | - Isabelle Lanneluc
- Laboratoire Littoral Environnement et Sociétés, La Rochelle Université, UMR 7266 CNRS, 17000 La Rochelle, France; (J.V.); (B.C.); (I.L.); (V.S.)
| | - René Sabot
- Laboratoire des Sciences de l’Ingénieur pour l’Environnement, La Rochelle Université, UMR 7356 CNRS, 17000 La Rochelle, France; (R.S.); (P.T.); (P.-Y.M.); (P.R.)
| | - Valérie Sopéna
- Laboratoire Littoral Environnement et Sociétés, La Rochelle Université, UMR 7266 CNRS, 17000 La Rochelle, France; (J.V.); (B.C.); (I.L.); (V.S.)
| | - Philippe Turcry
- Laboratoire des Sciences de l’Ingénieur pour l’Environnement, La Rochelle Université, UMR 7356 CNRS, 17000 La Rochelle, France; (R.S.); (P.T.); (P.-Y.M.); (P.R.)
| | - Pierre-Yves Mahieux
- Laboratoire des Sciences de l’Ingénieur pour l’Environnement, La Rochelle Université, UMR 7356 CNRS, 17000 La Rochelle, France; (R.S.); (P.T.); (P.-Y.M.); (P.R.)
| | - Philippe Refait
- Laboratoire des Sciences de l’Ingénieur pour l’Environnement, La Rochelle Université, UMR 7356 CNRS, 17000 La Rochelle, France; (R.S.); (P.T.); (P.-Y.M.); (P.R.)
| | - Marc Jeannin
- Laboratoire des Sciences de l’Ingénieur pour l’Environnement, La Rochelle Université, UMR 7356 CNRS, 17000 La Rochelle, France; (R.S.); (P.T.); (P.-Y.M.); (P.R.)
| | - Sophie Sablé
- Laboratoire Littoral Environnement et Sociétés, La Rochelle Université, UMR 7266 CNRS, 17000 La Rochelle, France; (J.V.); (B.C.); (I.L.); (V.S.)
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12
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Gaur VK, Sharma P, Gaur P, Varjani S, Ngo HH, Guo W, Chaturvedi P, Singhania RR. Sustainable mitigation of heavy metals from effluents: Toxicity and fate with recent technological advancements. Bioengineered 2021; 12:7297-7313. [PMID: 34569893 PMCID: PMC8806687 DOI: 10.1080/21655979.2021.1978616] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2021] [Accepted: 09/04/2021] [Indexed: 12/23/2022] Open
Abstract
Increase in anthropogenic activities due to rapid industrialization had caused an elevation in heavy metal contamination of aquatic and terrestrial ecosystems. These pollutants have detrimental effects on human and environmental health. The majority of these pollutants are carcinogenic, neurotoxic, and are very poisonous even at very low concentrations. Contamination caused by heavy metals has become a global concern for which the traditional treatment approaches lack in providing a cost-effective and eco-friendly solution. Therefore, the use of microorganisms and plants to reduce the free available heavy metal present in the environment has become the most acceptable method by researchers. Also, in microbial- and phyto-remediation the redox reaction shifts the valence which makes these metals less toxic. In addition to this, the use of biochar as a remediation tool has provided a sustainable solution that needs further investigations toward its implementation on a larger scale. Enzymes secreted by microbes and whole microbial cell are considered an eco-efficient biocatalyst for mitigation of heavy metals from contaminated sites. To the best of our knowledge there is very less literature available covering remediation of heavy metals aspect along with the sensors used for detection of heavy metals. Systematic management should be implemented to overcome the technical and practical limitations in the use of these bioremediation techniques. The knowledge gaps have been identified in terms of its limitation and possible future directions have been discussed.
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Affiliation(s)
- Vivek Kumar Gaur
- Amity Institute of Biotechnology, Amity University Uttar Pradesh, Lucknow Campus, Lucknow, India
| | - Poonam Sharma
- Department of Bioengineering, Integral University, Lucknow, India
| | - Prachi Gaur
- Department of Microbiology, Indian Institute of Management and Technology, Aligarh, India
| | - Sunita Varjani
- Paryavaran Bhavan, Gujarat Pollution Control Board, Gandhinagar, GujaratIndia
| | - Huu Hao Ngo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental, Engineering, University of Technology Sydney, Sydney, NSW – Australia
| | - Wenshan Guo
- Centre for Technology in Water and Wastewater, School of Civil and Environmental, Engineering, University of Technology Sydney, Sydney, NSW – Australia
| | - Preeti Chaturvedi
- Aquatic Toxicology Laboratory, Environmental Toxicology Group, Council of Scientific and Industrial Research-Indian Institute of Toxicology Research (Csir-iitr), LucknowUttar Pradesh, India
| | - Reeta Rani Singhania
- Department of Marine Environmental Engineering, National Kaohsiung University of Science and Technology, Kaohsiung City, Taiwan
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13
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Remediation of soil cadmium pollution by biomineralization using microbial-induced precipitation: a review. World J Microbiol Biotechnol 2021; 37:208. [PMID: 34719751 DOI: 10.1007/s11274-021-03176-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2021] [Accepted: 10/24/2021] [Indexed: 10/20/2022]
Abstract
In recent years, with industrial pollution and the application of agricultural fertilizers with high cadmium (Cd) content, soil Cd pollution has become increasingly serious. A large amount of Cd is discharged into the environment, greatly endangering the stability of the ecological environment and human health. The use of microorganisms to induce Cd precipitation and mineralization is an important bioremediation method. Itis highly efficient, has a low cost, enables environmental protection, and convenient to operate. This article summarizes the pollution status, pollution source, biological toxicity and existing forms of Cd, as well as the biomineralization mechanism of microbial induced Cd(II) precipitation, mainly including microbial-induced carbonate precipitation, microbial-induced phosphate precipitation and microbial-induced sulfide precipitation. Factors affecting the bioremediation of Cd, such as pH, coexisting ions, and temperature, are introduced. Finally, the key points and difficulties of future microbe-induced Cd(II) biomineralization research are highlighted, providing a scientific basis and theoretical guidance for the application of microbe-induced Cd(II) immobilization in soil.
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14
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Su YQ, Yuan S, Guo YC, Tan YY, Mao HT, Cao Y, Chen YE. Highly efficient and sustainable removal of Cr (VI) in aqueous solutions by photosynthetic bacteria supplemented with phosphor salts. CHEMOSPHERE 2021; 283:131031. [PMID: 34134043 DOI: 10.1016/j.chemosphere.2021.131031] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2020] [Revised: 04/06/2021] [Accepted: 05/22/2021] [Indexed: 06/12/2023]
Abstract
Photosynthetic bacteria have flexible metabolisms and strong environmental adaptability, and require cheap, but plentiful, energy supplements, which all enable their use in Cr(VI)-remediation. In this study, the effects of culture conditions on the total Cr removal rate were investigated for a newly identified strain of Rhodobacter sphaeroides SC01. The subcellular distribution and Cr(VI) reduction ability of four different cellular fractions were evaluated by scanning electron microscopy and transmission electron microscopy. Experiments indicated that the optimal culture conditions for total Cr removal included a culture temperature of 35 °C, pH of 7.20, an NaCl concentration of 5 g L-1, a light intensity of 4000 lx, and an initial cell concentration (OD680) of 0.15. In addition, most Cr was found in the cell membrane in the form of Cr (III) after reduction, while cell membranes had the highest Cr(VI) reduction rate (99%) compared to other cellular components. In addition, the physical and chemical properties of SC01 cells were characterized by FTIR, XPS, and XRD analyses, confirming that Cr was successfully absorbed on bacterial cell surfaces. CrPO4‧6H2O and Cr5(P3O10)3 precipitates were particularly identified by XRD analysis. After screening supplementation with five phosphor salts, Cr(VI) reduction due to bioprecipitation was improved by the addition of Na4P2O7 and (NaPO3)6 salts, with the Cr(VI)-reduction rate combined with Na4P2O7 addition being 15% higher than that of the control. Thus, this study proposes a new Cr(VI)-removal strategy based on the combined use of photosynthetic bacteria and phosphor salts, which importantly increases its potential application in treating wastewater.
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Affiliation(s)
- Yan-Qiu Su
- College of Life Science, Sichuan Normal University, Chengdu, China.
| | - Shu Yuan
- College of Life Sciences, Sichuan Agricultural University, Ya'an, China
| | - Yuan-Cheng Guo
- College of Life Science, Sichuan Normal University, Chengdu, China
| | - Yong-Yao Tan
- College of Life Science, Sichuan Normal University, Chengdu, China
| | - Hao-Tian Mao
- College of Life Sciences, Sichuan Agricultural University, Ya'an, China
| | - Yi Cao
- Microbiology and Metabolic Engineering of Key Laboratory of Sichuan Province, College of Life Sciences, Sichuan University, Chengdu, China
| | - Yang-Er Chen
- College of Life Sciences, Sichuan Agricultural University, Ya'an, China.
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15
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An M, Chang D, Hong D, Fan H, Wang K. Metabolic regulation in soil microbial succession and niche differentiation by the polymer amendment under cadmium stress. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:126094. [PMID: 34492903 DOI: 10.1016/j.jhazmat.2021.126094] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2021] [Revised: 04/26/2021] [Accepted: 05/10/2021] [Indexed: 06/13/2023]
Abstract
Cadmium (Cd) contamination seriously threatens the agricultural production, so exploring the response of soil microenvironment to amendments in Cd-contaminated soils is of importance. In this study, the mechanism of remediation of Cd-contaminated soil using the polymer amendment was studied in cotton flowering stage. The results showed that the concentration of Cd in cotton root and various Cd forms in Cd-contaminated soils were obviously high. High concentration of Cd, especially exchangeable Cd, could seriously affect the soil microenvironment. The root growth of cotton could be promoted, the carbon and nitrogen concentration and storage in soil were increased by 21.72-50.00%, while the exchangeable Cd concentration in soil were decreased by 41.43%, after applying the polymer amendment. In addition, the polymer amendment affected the soil microbial niche, increased the relative abundance of soil bacteria (Flaviaesturariibacter, Rubellimicrobium, and Cnuella), fungi (Verticillium and Tricharina), actinomycetes (Blastococcus and Nocardioides), and fungivores nematodes (Aphelenchus), and improved soil microbial metabolic functions (metabolism of nucleotides and carbohydrates). Therefore, this polymer amendment could be used to remediate severe Cd-contaminated soils, and the changes in the microbial and nematode communities help us understand the detoxification mechanism of the polymer amendment in Cd-contaminated soils.
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Affiliation(s)
- Mengjie An
- Agricultural College, Shihezi University, Shihezi, Xinjiang 832000, PR China
| | - Doudou Chang
- Agricultural College, Shihezi University, Shihezi, Xinjiang 832000, PR China
| | - Dashuang Hong
- Agricultural College, Shihezi University, Shihezi, Xinjiang 832000, PR China
| | - Hua Fan
- Agricultural College, Shihezi University, Shihezi, Xinjiang 832000, PR China
| | - Kaiyong Wang
- Agricultural College, Shihezi University, Shihezi, Xinjiang 832000, PR China.
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16
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Zamulina IV, Gorovtsov AV, Minkina TM, Mandzhieva SS, Bauer TV, Burachevskaya MV. The influence of long-term Zn and Cu contamination in Spolic Technosols on water-soluble organic matter and soil biological activity. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 208:111471. [PMID: 33068982 DOI: 10.1016/j.ecoenv.2020.111471] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/28/2020] [Revised: 09/26/2020] [Accepted: 10/06/2020] [Indexed: 06/11/2023]
Abstract
Potentially toxic elements (PTE) pollution has a pronounced negative effect on the soil and its components. The characteristics of soil organic matter and the activity of soil enzymes can serve as sensitive indicators of the degree of changes occurring in the soil. This study aims to assess the effect of long-term severe soil contamination with Zn and Cu on water-soluble organic matter (WSOM) and the associated changes in the biochemical activity of microorganisms. The total content of Zn and Cu in the studied soils varies greatly: Zn from 118 to 65,311 mg/kg, Cu from 52 to 437 mg/kg. The content of WSOM was determined using cold and hot extraction. It was revealed that the WSOM, extracted with cold water is a sensitive indicator reflecting the nature of the interaction of Zn and Cu with it. With an increase in the Cu and Zn content, the amount of WSOM extracted with cold water increases due to rise in the complex-bound metal compounds associated with it. The content of complex-bound compounds Zn in Spolic Technosols reaches 50% of the total metal content. It is shown that one of the biogeochemical mechanisms of microorganisms' adaptation to metal contamination is clearly manifested by the increase in the content of WSOM. The precipitation of metal carbonates develops in the soil which reduces the mobility and toxicity of PTE. Due to this mechanism, a decrease in the activity of dehydrogenases and urease was not prominent in all studied soils, despite the very high level of pollution and the transformation of organic matter. The study of the relationship of PTE with the most easily transformed part of WSOM and the activity of soil enzymes is of great importance for an objective assessment of possible environmental risks.
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Affiliation(s)
- Inna V Zamulina
- Southern Federal University, Rostov-on-Don 344090, Russian Federation
| | | | - Tatiana M Minkina
- Southern Federal University, Rostov-on-Don 344090, Russian Federation
| | | | - Tatiana V Bauer
- Southern Federal University, Rostov-on-Don 344090, Russian Federation; Federal Research Centre the Southern Scientific Centre of the Russian Academy of Sciences, Rostov-on-Don 344006, Russian Federation
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17
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Wu G, Cheng J, Wei J, Huang J, Sun Y, Zhang L, Huang Y, Yang Z. Growth and photosynthetic responses of Ochromonas gloeopara to cadmium stress and its capacity to remove cadmium. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 273:116496. [PMID: 33484999 DOI: 10.1016/j.envpol.2021.116496] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 12/29/2020] [Accepted: 01/09/2021] [Indexed: 06/12/2023]
Abstract
Cadmium (Cd) is one of the predominant anthropogenic pollutants in aquatic systems. As Cd has negative effects on species at all trophic levels, the community composition in aquatic habitats can be changed as a result of Cd stress. The response of mixotrophic protists to environmental stressors is particularly important as they act as both producers and consumers in complex planktonic communities. In this study, we used mixotrophic Ochromonas gloeopara to study its growth and photosynthetic responses to Cd, and specially focused on the effects of initial Cd concentrations and nutrient levels on its capacity to remove Cd. Results showed that when Cd concentration reached 0.5 mg L-1, the growth rate and carrying capacity were significantly inhibited, whereas the photosynthesis was markedly decreased when Cd concentration reached 0.15 mg L-1. Moreover, under Cd concentration 0.15, 0.5, 0.9, 1.6, and 2.0 mg L-1, the removal efficiencies of Cd by O. gloeopara were 83.2%, 77.7%, 74.6%, 70.1%, and 68.8%, respectively. The increase of nitrogen did not cause significant effect on the removal capacity of Cd by O. gloeopara, but increased concentration of phosphorus significantly enhanced the removal capacity of Cd. Our findings indicated that the mixotrophic O. gloeopara has strong tolerance and capacity to remove Cd, and increasing concentration of phosphorus can increase its removal capacity, suggesting that O. gloeopara has great potential application value in mitigating Cd pollution in waters.
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Affiliation(s)
- Guangjin Wu
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Jiahui Cheng
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Junjun Wei
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Jing Huang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Yunfei Sun
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Lu Zhang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Yuan Huang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China
| | - Zhou Yang
- Jiangsu Key Laboratory for Biodiversity and Biotechnology, School of Biological Sciences, Nanjing Normal University, 1 Wenyuan Road, Nanjing, 210023, China.
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Cheng C, Luo W, Wang Q, He L, Sheng X. Combined biochar and metal-immobilizing bacteria reduces edible tissue metal uptake in vegetables by increasing amorphous Fe oxides and abundance of Fe- and Mn-oxidising Leptothrix species. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 206:111189. [PMID: 32858328 DOI: 10.1016/j.ecoenv.2020.111189] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/25/2020] [Revised: 07/16/2020] [Accepted: 08/14/2020] [Indexed: 06/11/2023]
Abstract
In this study, a highly effective combined biochar and metal-immobilizing bacteria (Bacillus megaterium H3 and Serratia liquefaciens CL-1) (BHC) was characterized for its effects on solution Pb and Cd immobilization and edible tissue biomass and Pb and Cd accumulation in Chinese cabbages and radishes and the mechanisms involved in metal-polluted soils. In the metal-containing solution treated with BHC, the Pb and Cd concentrations decreased, while the pH and cell numbers of strains H3 and CL-1 increased over time. BHC significantly increased the edible tissue dry weight by 17-34% and reduced the edible tissue Pb (0.32-0.46 mg kg-1) and Cd (0.16 mg kg-1) contents of the vegetables by 24-45%. In the vegetable rhizosphere soils, BHC significantly decreased the acid-soluble Pb (1.81-2.21 mg kg-1) and Cd (0.40-0.48 mg kg-1) contents by 26-47% and increased the reducible Pb (18.2-18.8 mg kg-1) and Cd (0.38-0.39 mg kg-1) contents by 10-111%; while BHC also significantly increased the pH, urease activity by 115-169%, amorphous Fe oxides content by 12-19%, and relative abundance of gene copy numbers of Fe- and Mn-oxidising Leptothrix species by 28-73% compared with the controls. These results suggested that BHC decreased edible tissue metal uptake of the vegetables by increasing pH, urease activity, amorphous Fe oxides, and Leptothrix species abundance in polluted soil. These results may provide an effective and eco-friendly way for metal remediation and reducing metal uptake in vegetables by using combined biochar and metal-immobilizing bacteria in polluted soils.
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Affiliation(s)
- Cheng Cheng
- Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, PR China
| | - Weiwei Luo
- Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, PR China
| | - Qingxiang Wang
- Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, PR China
| | - Linyan He
- Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, PR China
| | - Xiafang Sheng
- Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, College of Life Sciences, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, PR China.
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19
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Cheng C, Han H, Wang Y, He L, Sheng X. Metal-immobilizing and urease-producing bacteria increase the biomass and reduce metal accumulation in potato tubers under field conditions. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 203:111017. [PMID: 32678748 DOI: 10.1016/j.ecoenv.2020.111017] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 07/01/2020] [Accepted: 07/06/2020] [Indexed: 06/11/2023]
Abstract
In this study, the effect of two metal-immobilizing bacterial strains, Serratia liquefaciens CL-1 and Bacillus thuringiensis X30, on the availability of Cd and Pb and the metal accumulation in potato tubers, as well as the underlying mechanisms in metal-contaminated soils were characterized. Moreover, the impacts of the strains on metal immobilization, pH, and NH4+ concentration in metal-contaminated soil solutions were evaluated. Strains CL-1 and X30 increased tuber dry weight by 46% and 40%, reduced tuber Cd and Pb contents by 68-83% and 42-47%, and decreased the Cd and Pb translocation factors by 61-70% and 30-34%, respectively, compared to the controls. Strains CL-1 and X30 decreased the available Cd and Pb contents by 52-67% and 30-44% and increased the NH4+ content by 55% and 31%, pH, urease activity by 70% and 41%, and relative abundance of ureC gene copies by 37% and 20% in the rhizosphere soils, respectively, compared with the controls. Reduced Cd and Pb concentrations and increased pH and NH4+ concentration were found in the bacteria-inoculated soil solution compared to the controls. These results suggested that the strains reduced tuber metal uptake through decreasing the metal availability and increasing the pH, ureC gene relative abundance and urease activity as well as decreasing the metal translocation from the leaves to tubers. These results may provide an effective metal-immobilizing bacteria (especially strain CL-1)-enhanced approach to reduce metal uptake of potato tubers in metal-polluted soils.
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Affiliation(s)
- Cheng Cheng
- College of Life Sciences, Nanjing Agricultural University, Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, Nanjing, 210095, PR China
| | - Hui Han
- College of Life Sciences, Nanjing Agricultural University, Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, Nanjing, 210095, PR China; College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, PR China
| | - Yaping Wang
- College of Life Sciences, Nanjing Agricultural University, Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, Nanjing, 210095, PR China
| | - Linyan He
- College of Life Sciences, Nanjing Agricultural University, Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, Nanjing, 210095, PR China.
| | - Xiafang Sheng
- College of Life Sciences, Nanjing Agricultural University, Key Laboratory of Agricultural and Environmental Microbiology, Ministry of Agriculture, Nanjing, 210095, PR China.
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20
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Babakhani S, Fahmi A, Katebi H, Ouria A, Majnouni-Toutakhane A, Ganbarov K, Kafil HS. Non-sterile corn steep liquor a novel, cost effective and powerful culture media for Sporosarcina pasteurii cultivation for sand improvement. J Appl Microbiol 2020; 130:1232-1244. [PMID: 33025710 DOI: 10.1111/jam.14866] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2020] [Revised: 09/07/2020] [Accepted: 09/17/2020] [Indexed: 11/30/2022]
Abstract
AIMS Microbial induced calcium carbonate precipitation (MICP) is one of the bio-cementation methods for improving granular soils. This study evaluate the feasibility of obtaining a bacterial solution with high optical density and urease activity by an inexpensive corn steep liquor (CSL) medium in non-sterile conditions in order to achieve sand improvement. METHODS AND RESULTS Corn steep liquor media with different concentrations (different dilution rates) were prepared and, without any autoclaving (non-sterile conditions), different percentage of the inoculum solutions were added to them and incubated. Effect of inoculum solution percentage and CSL dilution rates on specifications of bacterial solution was evaluated. Urease activity and scanning electron microscope (SEM) and X-Ray Diffraction (XRD) were used to efficiency of CLS media in sand improvement. The considerable urease activity was measured as 5·7 mS cm-1 min-1 using nonsterile CLS. By using CYNU (CSL-Yeast extract-NH4Cl-Urea) bacterial solution, the urease activity of 5·5 mS cm-1 min-1 for the OD600 (optical density at 600 nm) of 1·88 and, consequently, specific urease activity of 2·93 mS cm-1 min-1 OD600 -1 was obtained. The highest unconfined compressive strength (811 kPa) was obtained for the CYNU. XRD revealed new calcite peaks next to the quartz peaks. CONCLUSIONS Production of inexpensive bacterial solution using diluted CSL as the inexpensive, effective and powerful culture media for Sporosarcina pasteurii cultivation in nonsterile conditions, allows geotechnical and biotechnological engineers to use MICP technology more widely in land improvement and field-scale bio-cementation and bioremediation projects. SIGNIFICANCE AND IMPACT OF THE STUDY Obtaining high urease activity of inexpensive microbial solution using diluted CSL as the culture medium in nonsterile conditions, as the unique results of this study, can be significant in the field of bioremediation studies using MICP.
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Affiliation(s)
| | - A Fahmi
- Department of Civil Engineering, Faculty of Engineering, University of Bonab, Bonab, Iran
| | - H Katebi
- Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran
| | - A Ouria
- Department of Civil Engineering, University of Mohaghegh Ardabili, Ardabil, Iran
| | | | - K Ganbarov
- Department of Microbiology, Baku State University, Baku, Azerbaijan
| | - H S Kafil
- Drug Applied Research Center, Faculty of Medicine, Tabriz University of Medical Science, Tabriz, Iran
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21
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Sun L, Zheng Y, Yu X. Flocculation-bio-treatment of heavy metals-vacuum preloading of the river sediments. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 201:110810. [PMID: 32521369 DOI: 10.1016/j.ecoenv.2020.110810] [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: 03/06/2020] [Revised: 05/24/2020] [Accepted: 05/25/2020] [Indexed: 06/11/2023]
Abstract
Heavy metals pollution in river sediments is irreversible, and it is not easy to be found to be concealed. The pollution of heavy metals for river sediments is currently a serious environmental problem. In the paper, the Bacillus subtilis was selected to remove heavy metals by bio-mineralization method in river sediments. Optimal content of Bacillus subtilis powder and organophosphate monoester was 20 g and 0.2 mol in 1 L of bacterial solution, respectively. The optimum reaction time and temperature were 36 h and 30 °C, respectively. The optimal reaction conditions were applied to zinc ions in river sediments. After heavy metals treatment, there was little effect on the water content before and after flocculation and vacuum preloading. Treatment of heavy metals had no effect on the cross-plate shear strength of river sediments after vacuum preloading. After treatment of heavy metals, the effect of purifying water quality was the group B(Polyacrylamide + Polysilicate aluminium ferric) bigger than the group A (Polyacrylamide). The removal efficiency of zinc ions (Zn2+) in the group B was 89.59% and 74.99% before and after the vacuum preloading, respectively, which was better than that in the group A.
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Affiliation(s)
- Linzhu Sun
- College of Civil Engineering and Architecture, Wenzhou University, Wenzhou, 325035, China
| | - Yunyun Zheng
- College of Civil Engineering and Architecture, Wenzhou University, Wenzhou, 325035, China
| | - Xiaoniu Yu
- College of Civil Engineering and Architecture, Wenzhou University, Wenzhou, 325035, China; School of Environment, Tsinghua University, Beijing, 100084, China.
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Do H, Wang Y, Long Z, Ketehouli T, Li X, Zhao Z, Li M. A psychrotolerant Ni-resistant Bacillus cereus D2 induces carbonate precipitation of nickel at low temperature. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 198:110672. [PMID: 32361494 DOI: 10.1016/j.ecoenv.2020.110672] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Revised: 02/26/2020] [Accepted: 04/20/2020] [Indexed: 06/11/2023]
Abstract
Psychrotolerant bacteria play a particularly important role in the remediation of heavy metal in contamination sites at low temperatures. In the current study, a psychrotolerant Ni-resistant bacterial strain, identified as Bacillus cereus D2, was isolated from a nickel mining area in China. The isolated strain could produce a large amount of urease enzyme (194.6 U/mL), grow well in harsh environmental conditions at a temperature of 10 °C, and at a Ni (II) concentration up to 400 mg/L. Also, under the low temperature (10 °C), this strain has been revealed to induce carbonate precipitation (Ni2CO3(OH)2·H2O) through biomineralization for removing the high efficiency of Ni ions (73.47%) from the culture solution. Furthermore, strain D2 could immobilize the DTPA-Ni in contaminated soil under the case of the laboratory condition at 10 °C. These data support that the psychrotolerant bacterial strain D2 may play an important role in remediation technology by eliminating Ni ions from the contaminated soil at low temperatures.
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Affiliation(s)
- Hoaithuong Do
- College of Resource and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Yuqi Wang
- College of Resource and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Zhenhua Long
- College of Resource and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Toi Ketehouli
- College of Life Sciences, Engineering Research Center of the Chinese Ministry of Education for Bioreactor and Pharmaceutical Development, Jilin Agricultural University, Changchun, 130118, China
| | - Xiang Li
- College of Resource and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Zijun Zhao
- College of Resource and Environment, Jilin Agricultural University, Changchun, 130118, China
| | - Mingtang Li
- College of Resource and Environment, Jilin Agricultural University, Changchun, 130118, China.
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Functional Analysis of Organic Acids on Different Oilseed Rape Species in Phytoremediation of Cadmium Pollution. PLANTS 2020; 9:plants9070884. [PMID: 32668773 PMCID: PMC7412029 DOI: 10.3390/plants9070884] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Revised: 07/04/2020] [Accepted: 07/09/2020] [Indexed: 11/17/2022]
Abstract
Cadmium (Cd) pollution in soil is becoming increasingly serious due to anthropogenic activities, which not only poses a threat to the ecological environment, but also causes serious damage to human health via the biological chain. Consequently, special concerns should be paid to develop and combine multiple remediation strategies. In this study, different subspecies of oilseed rape, Brassica campestris, Brassica napus and Brassica juncea were applied, combined with three organic acids, acetic acid, oxalic acid and citric acid, in a simulated Cd-contaminated soil. Various physiological and biochemical indexes were monitored in both plant seedling, growth period and mature stage. The results showed that organic acids significantly promoted the growth of Brassica campestris and Brassica juncea under Cd stress. The photosynthesis and antioxidant enzyme activities in Brassica campestris and Brassica juncea were induced at seedling stage, while that in Brassica napus were suppressed and disturbed. The enrichment of Cd in oilseed rape was also obviously increased. Brassica juncea contained relatively high resistance and Cd content in plant but little Cd in seed. Among the three acids, oxalic acids exhibited the most efficient promoting effect on the accumulation of Cd by oilseed rape. Here, a comprehensive study on the combined effects of oilseed rape and organic acids on Cd contaminated soil showed that Brassica juncea and oxalic acid possessed the best effect on phytoremediation of Cd contaminated soil. Our study provides an optimal way of co-utilizing oilseed rape and organic acid in phytoremediation of Cd contaminated soil.
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Han H, Cai H, Wang X, Hu X, Chen Z, Yao L. Heavy metal-immobilizing bacteria increase the biomass and reduce the Cd and Pb uptake by pakchoi (Brassica chinensis L.) in heavy metal-contaminated soil. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 195:110375. [PMID: 32200142 DOI: 10.1016/j.ecoenv.2020.110375] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 02/23/2020] [Accepted: 02/24/2020] [Indexed: 06/10/2023]
Abstract
Microbial immobilization is a novel and environmentally friendly technology that uses microbes to reduce metal availability in soil and accumulation of heavy metals in plants. We used urea agar plates to isolate urease-producing bacteria from the rhizosphere soil of pakchoi in Cd- and Pb-contaminated farmland and investigated their effects on Cd and Pb accumulation in pakchoi and the underlying mechanisms. The results showed that two urease-producing bacteria, Bacillus megaterium N3 and Serratia liquefaciens H12, were identified by screening. They had higher ability to produce urease (57.5 ms cm-1 min-1 OD600-1 and 76.4 ms cm-1 min-1 OD600-1, respectively). The two strains allowed for the immobilization of Cd and Pb by extracellular adsorption, bioprecipitation, and increasing the pH (from 6.94 to 7.05-7.09), NH4+ content (69.1%-127%), and NH4+/NO3- ratio (from 1.37 to 1.67-2.11), thereby reducing the DTPA-extractable Cd (35.3%-58.8%) and Pb (37.8%-62.2%) contents in the pakchoi rhizosphere soils and the Cd (76.5%-79.7%) and Pb (76.3%-83.5%) contents in the leaves (edible tissue) of pakchoi. The strains were highly resistant to heavy metal toxicity; produced IAA, siderophores and abscisic acid; and increased the NH4+/NO3- ratio, which might be related to the two strains protectiing pakchoi against the toxic effect of Cd and Pb and increasing pakchoi biomass. Thus, the results were supposed to strain resources and a theoretical basis for the remediation of Cd- and Pb-contaminated farmlands for the safe production of vegetables.
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Affiliation(s)
- Hui Han
- Collaborative Innovation Center of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, China; Henan Provincial Academician Workstation of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project, Nanyang Normal University, Nanyang, 473061, China
| | - Hong Cai
- Collaborative Innovation Center of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, China
| | - Xiaoyu Wang
- Collaborative Innovation Center of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, China
| | - Xiaomin Hu
- Collaborative Innovation Center of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, China
| | - Zhaojin Chen
- Collaborative Innovation Center of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, China; Henan Provincial Academician Workstation of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project, Nanyang Normal University, Nanyang, 473061, China.
| | - Lunguang Yao
- Collaborative Innovation Center of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, China; Henan Provincial Academician Workstation of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project, Nanyang Normal University, Nanyang, 473061, China.
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Wang T, Wang X, Tian W, Yao L, Li Y, Chen Z, Han H. Screening of Heavy Metal-Immobilizing Bacteria and Its Effect on Reducing Cd 2+ and Pb 2+ Concentrations in Water Spinach ( Ipomoea aquatic Forsk.). INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2020; 17:ijerph17093122. [PMID: 32365834 PMCID: PMC7246948 DOI: 10.3390/ijerph17093122] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/13/2020] [Revised: 04/27/2020] [Accepted: 04/28/2020] [Indexed: 01/09/2023]
Abstract
Microbial immobilization is considered as a novel and environmentally friendly technology that uses microbes to reduce heavy metals accumulation in plants. To explore microbial resources which are useful in these applications, three water spinach rhizosphere soils polluted by different levels of heavy metals (heavy pollution (CQ), medium pollution (JZ), and relative clean (NF)) were collected. The community composition of heavy metal-immobilizing bacteria in rhizosphere soils and its effects on reducing the Cd2+ and Pb2+ concentrations in water spinach were evaluated. Four hundred strains were isolated from the CQ (belonging to 3 phyla and 14 genera), JZ (belonging to 4 phyla and 25 genera) and NF (belonged to 6 phyla and 34 genera) samples, respectively. In the CQ sample, 137 strains showed a strong ability to immobilize Cd2+ and Pb2+, giving Cd2+ and Pb2+ removal rates of greater than 80% in solution; Brevundimonas, Serratia, and Pseudoarthrobacter were the main genera. In total, 62 strains showed a strong ability to immobilize Cd2+ and Pb2+ in the JZ sample and Bacillus and Serratia were the main genera. A total of 22 strains showed a strong ability to immobilize Cd2+ and Pb2+ in the NF sample, and Bacillus was the main genus. Compared to the control, Enterobacter bugandensis CQ-7, Bacillus thuringensis CQ-33, and Klebsiella michiganensis CQ-169 significantly increased the dry weight (17.16-148%) of water spinach and reduced the contents of Cd2+ (59.78-72.41%) and Pb2+ (43.36-74.21%) in water spinach. Moreover, the soluble protein and Vc contents in the shoots of water spinach were also significantly increased (72.1-193%) in the presence of strains CQ-7, CQ-33 and CQ-169 compared to the control. In addition, the contents of Cd and Pb in the shoots of water spinach meet the standard for limit of Cd2+ and Pb2+ in vegetables in the presence of strains CQ-7, CQ-33 and CQ-169. Thus, the results provide strains as resources and a theoretical basis for the remediation of Cd- and Pb-contaminated farmlands for the safe production of vegetables.
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Affiliation(s)
- Tiejun Wang
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang 473061, China; (T.W.); (X.W.); (L.Y.)
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China;
| | - Xiaoyu Wang
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang 473061, China; (T.W.); (X.W.); (L.Y.)
| | - Wei Tian
- Nanjing Institute of Environmental Sciences, Ministry of Ecology and Environment, Nanjing 210042, China;
| | - Lunguang Yao
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang 473061, China; (T.W.); (X.W.); (L.Y.)
| | - Yadong Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan 430062, China;
| | - Zhaojin Chen
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang 473061, China; (T.W.); (X.W.); (L.Y.)
- Correspondence: (Z.C.); (H.H.); Tel.: +86-377-63525027 (Z.C. & H.H.)
| | - Hui Han
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang 473061, China; (T.W.); (X.W.); (L.Y.)
- Correspondence: (Z.C.); (H.H.); Tel.: +86-377-63525027 (Z.C. & H.H.)
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Wang T, Wang S, Tang X, Fan X, Yang S, Yao L, Li Y, Han H. Isolation of urease-producing bacteria and their effects on reducing Cd and Pb accumulation in lettuce (Lactuca sativa L.). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:8707-8718. [PMID: 31912394 DOI: 10.1007/s11356-019-06957-3] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/21/2019] [Accepted: 11/04/2019] [Indexed: 06/10/2023]
Abstract
Excess Cd and Pb in agricultural soils enter the food chain and adversely affect all organisms. Therefore, it is important to find an eco-friendly way to reduce heavy metal accumulation in vegetables. We used urea agar plates to isolate urease-producing bacteria from the rhizosphere soil of lettuce in Cd- and Pb-contaminated farmland and investigated their ability to produce urease and immobilize heavy metals. The effects of these strains on the biomass, quality, and Cd and Pb accumulation of lettuce were also studied. The results showed that two urease-producing bacteria, Enterobacter bugandensis TJ6 and Bacillus megaterium HD8, were screened from the rhizosphere soil of lettuce. They had a high ability to produce urease (44.5 mS cm-1 min-1 OD600-1 and 54.2 mS cm-1 min-1 OD600-1, respectively) and IAA (303 mg L-1 and 387 mg L-1, respectively). Compared with the control, inoculation with strains TJ6 and HD8 reduced the Cd (75.3-85.8%) and Pb (74.8-87.2%) concentrations and increased the pH (from 6.92 to 8.13-8.53) in solution. A hydroponic experiment showed that the two strains increased the biomass (31.3-55.2%), improved the quality (28.6-52.6% for the soluble protein content and 34.8-88.4% for the vitamin C (Vc) content), and reduced the Cd (25.6-68.9%) and Pb (48.7-78.8%) contents of lettuce shoots (edible tissue). In addition, strain HD8 had a greater ability than strain TJ6 to reduce lettuce Cd and Pb uptake and water-soluble Cd and Pb levels in solution. These data show that the urease-producing bacteria protect lettuce against Cd and Pb toxicity by extracellular adsorption, Cd and Pb immobilization, and increased pH. The effects of heavy metal immobilization by the two strains can guarantee vegetable safety in situ for the bioremediation of heavy metal-polluted farmland.
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Affiliation(s)
- Tiejun Wang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Shilin Wang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Xingchun Tang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Xianpeng Fan
- Institute of Plant Protection and Soil Fertilizer, Hubei Academy of Agricultural Sciences, Wuhan, 430062, People's Republic of China
| | - Sheng Yang
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China
| | - Lunguang Yao
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, People's Republic of China
| | - Yadong Li
- State Key Laboratory of Biocatalysis and Enzyme Engineering, School of Life Sciences, Hubei University, Wuhan, 430062, People's Republic of China.
| | - Hui Han
- Collaborative Innovation of Water Security for the Water Source Region of Mid-line of the South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, People's Republic of China.
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Rodríguez-Andrade O, Corral-Lugo A, Morales-García YE, Quintero-Hernández V, Rivera-Urbalejo AP, Molina-Romero D, Martínez-Contreras RD, Bernal P, Muñoz-Rojas J. Identification of Klebsiella Variicola T29A Genes Involved In Tolerance To Desiccation. Open Microbiol J 2019. [DOI: 10.2174/1874285801913010256] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
Introduction:Several plant-beneficial bacteria have the capability to promote the growth of plants through different mechanisms. The survival of such bacteria could be affected by environmental abiotic factors compromising their capabilities of phytostimulation. One of the limiting abiotic factors is low water availability.Materials and Methods:In extreme cases, bacterial cells can suffer desiccation, which triggers harmful effects on cells. Bacteria tolerant to desiccation have developed different strategies to cope with these conditions; however, the genes involved in these processes have not been sufficiently explored.Klebsiella variicolaT29A is a beneficial bacterial strain that promotes the growth of corn plants and is highly tolerant to desiccation. In the present work, we investigated genes involved in desiccation tolerance.Results & Discussion:As a result, a library of 8974 mutants of this bacterial strain was generated by random mutagenesis with mini-Tn5 transposon, and mutants that lost the capability to tolerate desiccation were selected. We found 14 sensitive mutants; those with the lowest bacterial survival rate contained mini-Tn5 transposon inserted into genes encoding a protein domain related to BetR, putative secretion ATPase and dihydroorotase. The mutant in the betR gene had the lowest survival; therefore, the mutagenized gene was validated using specific amplification and sequencing.Conclusion:Trans complementation with the wild-type gene improved the survival of the mutant under desiccation conditions, showing that this gene is a determinant for the survival ofK. variicolaT29A under desiccation conditions.
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Li Z, Wang P, Yue X, Wang J, Ren B, Qu L, Han H. Effects of Bacillus thuringiensis HC-2 Combined with Biochar on the Growth and Cd and Pb Accumulation of Radish in a Heavy Metal-Contaminated Farmland under Field Conditions. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2019; 16:E3676. [PMID: 31574932 PMCID: PMC6801573 DOI: 10.3390/ijerph16193676] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/23/2019] [Accepted: 09/27/2019] [Indexed: 12/17/2022]
Abstract
The objective of this study was to explore the effect of heavy metal-resistant bacteria and biochar (BC) on reducing heavy metal accumulation in vegetables and the underlying mechanism. We tested Bacillus thuringiensis HC-2, BC, and BC+HC-2 for their ability to immobilize Cd and Pb in culture solution. We also studied the effects of these treatments on the dry weight and Cd and Pb uptake of radish in metal-contaminated soils under field conditions and the underlying mechanism. Treatment with HC-2, BC, and BC+HC-2 significantly reduced the water-soluble Cd (34-56%) and Pb (31-54%) concentrations and increased the pH and NH4+ concentration in solution compared with their vales in a control. These treatments significantly increased the dry weight of radish roots (18.4-22.8%) and leaves (37.8-39.9%) and decreased Cd (28-94%) and Pb (22-63%) content in the radish roots compared with the control. Treatment with HC-2, BC, and BC+HC-2 also significantly increased the pH, organic matter content, NH4+ content, and NH4+/NO3- ratio of rhizosphere soils, and decreased the DTPA-extractable Cd (37-58%) and Pb (26-42%) contents in rhizosphere soils of radish. Furthermore, BC+HC-2 had higher ability than the other two treatments to protect radish against Cd and Pb toxicity and increased radish biomass. Therefore, Bacillus thuringiensis HC-2 combined with biochar can ensure vegetable safety in situ for the bioremediation of heavy metal-polluted farmland.
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Affiliation(s)
- Zigang Li
- School of Food and Bioengineering, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China.
- State Key Laboratory of Motor Vehicle Biofuel Technology, Nanyang 473000, China.
| | - Peng Wang
- School of Food and Bioengineering, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China.
| | - Xiaoyu Yue
- School of Food and Bioengineering, Henan University of Animal Husbandry and Economy, Zhengzhou 450046, China.
| | - Jingtao Wang
- State Key Laboratory of Motor Vehicle Biofuel Technology, Nanyang 473000, China.
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China.
| | - Baozeng Ren
- State Key Laboratory of Motor Vehicle Biofuel Technology, Nanyang 473000, China.
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China.
| | - Lingbo Qu
- State Key Laboratory of Motor Vehicle Biofuel Technology, Nanyang 473000, China.
- School of Chemical Engineering, Zhengzhou University, Zhengzhou 450001, China.
| | - Hui Han
- Collaborative Innovation Center of Water Security for Water Source Region of Mid-route Project of South-North Water Diversion of Henan Province, School of Agricultural Engineering, Nanyang Normal University, Nanyang 473061, China.
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