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Elizabeth George S, Wan Y. Microbial functionalities and immobilization of environmental lead: Biogeochemical and molecular mechanisms and implications for bioremediation. JOURNAL OF HAZARDOUS MATERIALS 2023; 457:131738. [PMID: 37285788 PMCID: PMC11249206 DOI: 10.1016/j.jhazmat.2023.131738] [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: 02/11/2023] [Revised: 05/26/2023] [Accepted: 05/28/2023] [Indexed: 06/09/2023]
Abstract
The increasing environmental and human health concerns about lead in the environment have stimulated scientists to search for microbial processes as innovative bioremediation strategies for a suite of different contaminated media. In this paper, we provide a compressive synthesis of existing research on microbial mediated biogeochemical processes that transform lead into recalcitrant precipitates of phosphate, sulfide, and carbonate, in a genetic, metabolic, and systematics context as they relate to application in both laboratory and field immobilization of environmental lead. Specifically, we focus on microbial functionalities of phosphate solubilization, sulfate reduction, and carbonate synthesis related to their respective mechanisms that immobilize lead through biomineralization and biosorption. The contributions of specific microbes, both single isolates or consortia, to actual or potential applications in environmental remediation are discussed. While many of the approaches are successful under carefully controlled laboratory conditions, field application requires optimization for a host of variables, including microbial competitiveness, soil physical and chemical parameters, metal concentrations, and co-contaminants. This review challenges the reader to consider bioremediation approaches that maximize microbial competitiveness, metabolism, and the associated molecular mechanisms for future engineering applications. Ultimately, we outline important research directions to bridge future scientific research activities with practical applications for bioremediation of lead and other toxic metals in environmental systems.
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Affiliation(s)
- S Elizabeth George
- US EPA Office of Research and Development, Center for Environmental Measurement and Modeling, Gulf Ecosystem Measurement and Modeling Division, One Sabine Island Drive, Gulf Breeze, FL 32561, USA
| | - Yongshan Wan
- US EPA Office of Research and Development, Center for Environmental Measurement and Modeling, Gulf Ecosystem Measurement and Modeling Division, One Sabine Island Drive, Gulf Breeze, FL 32561, USA.
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Hydrogen Sulfide Production with a Microbial Consortium Isolated from Marine Sediments Offshore. JOURNAL OF MARINE SCIENCE AND ENGINEERING 2022. [DOI: 10.3390/jmse10030436] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
Hydrogen, electric energy production, and metal toxic bioremediation are some of the biotechnological applications of sulfate-reducing organisms, which potentially depend on the sulfide produced. In this study, offshore of Yucatan, the capacity to produce hydrogen sulfide using microbial consortia from marine sediment (SC469, PD102, SD636) in batch reactors was evaluated. Kinetic tests were characterized by lactate oxidation to acetate, propionate, CO2 and methane. The inoculum SC469, located in open-ocean, differed strongly in microbial diversity and showed better performance in substrate utilization with the highest hydrogen sulfide production (246 mmolg−1 VSS) at a specific hydrogen sulfide rate of 113 mmol g−1 VSS d−1 with a 0.79 molar ratio of sulfate/lactate. Sulfate-reducing microbial consortia enriched in the laboratory from marine sediments collected offshore in Yucatan and with a moderate eutrophication index, differed strongly in microbial diversity with loss of microorganisms with greater capacity for degradation of organic macromolecules. The sulfate-reducing microorganisms were characterized using Illumina MiSeq technology and were mainly Desulfomicrobium, Clostridium and Desulfobacter.
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Tao W, Lin J, Wang W, Huang H, Li S. Designer bioemulsifiers based on combinations of different polysaccharides with the novel emulsifying esterase AXE from Bacillus subtilis CICC 20034. Microb Cell Fact 2019; 18:173. [PMID: 31601224 PMCID: PMC6786282 DOI: 10.1186/s12934-019-1221-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Accepted: 09/27/2019] [Indexed: 12/19/2022] Open
Abstract
Background Bioemulsifiers are surface-active compounds, which exhibit advantages including low toxicity, higher biodegradability and biocompatibility over synthetic chemical surfactants. Despite their potential benefits, some obstacles impede the practical applications of bioemulsifiers, including low yields and high purification costs. Here, we aimed to exploit a novel protein bioemulsifier with efficient emulsifying activity and low-production cost, as well as proposed a design-bioemulsifier system that meets different requirements of industrial emulsification in the most economical way. Results The esterase AXE was first reported for its efficient emulsifying activity and had been studied for possible application as a protein bioemulsifier. AXE showed an excellent emulsification effect with different hydrophobic substrates, especially short-chain aliphatic and benzene derivatives, as well as excellent stability under extreme conditions such as high temperature (85 °C) and acidic conditions. AXE also exhibited good stability over a range of NaCl, MgSO4, and CaCl2 concentrations from 0 to 1000 mM, and the emulsifying activity even showed a slight increase at salt concentrations over 500 mM. A design-bioemulsifier system was proposed that uses AXE in combination with a variety of polysaccharides to form efficient bioemulsifier, which enhanced the emulsifying activity and further lowered the concentration of AXE needed in the complex. Conclusions AXE showed a great application potential as a novel bioemulsifier with excellent emulsifying ability. The AXE-based-designer bioemulsifier could be obtained in the most economical way and open broad new fields for low-cost, environmentally friendly bioemulsifiers.![]()
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Affiliation(s)
- Weiyi Tao
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, People's Republic of China
| | - Junzhang Lin
- Oil Production Research Institute, Shengli Oil Field Ltd. Co. SinoPEC, Dongying, China
| | - Weidong Wang
- Oil Production Research Institute, Shengli Oil Field Ltd. Co. SinoPEC, Dongying, China
| | - He Huang
- School of Pharmaceutical Sciences, Nanjing Tech University, Nanjing, 211816, People's Republic of China
| | - Shuang Li
- College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, 211816, People's Republic of China.
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Associations of prenatal exposure to polybrominated diphenyl ethers and polychlorinated biphenyls with long-term gut microbiome structure: a pilot study. Environ Epidemiol 2019; 3. [PMID: 30778401 PMCID: PMC6376400 DOI: 10.1097/ee9.0000000000000039] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
Supplemental Digital Content is available in the text. The gut microbiome is influenced by early-life exposures, but—despite potentially enormous implications for child health—is understudied in environmental epidemiology. This pilot study is one of the first to explore in utero exposures and long-term gut microbiome profiles. We examined the association between exposure to polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) during pregnancy and the mid-childhood gut microbiome.
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Xu W, Zhang Y, Cao H, Sheng Y, Li H, Li Y, Zhao H, Gui X. Metagenomic insights into the microbiota profiles and bioaugmentation mechanism of organics removal in coal gasification wastewater in an anaerobic/anoxic/oxic system by methanol. BIORESOURCE TECHNOLOGY 2018; 264:106-115. [PMID: 29793117 DOI: 10.1016/j.biortech.2018.05.064] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Revised: 05/15/2018] [Accepted: 05/17/2018] [Indexed: 06/08/2023]
Abstract
Coal gasification wastewater is a typical high phenol-containing, toxic and refractory industrial wastewater. Here, lab-scale anaerobic-anoxic-oxic system was employed to treat real coal gasification wastewater, and methanol was added to oxic tank as the co-substrate to enhance the removal of refractory organic pollutants. The results showed that the average COD removal in oxic effluent increased from 24.9% to 36.0% by adding methanol, the total phenols concentration decreased from 54.4 to 44.9 mg/L. GC-MS analysis revealed that contents of phenolic components and polycyclic aromatic hydrocarbons (PAHs) were decreased compared to the control and their degradation intermediates were observed. Microbial community revealed that methanol increased the abundance of phenolics and PAHs degraders such as Comamonas, Burkholderia and Sphingopyxis. Moreover, functional analysis revealed the relative abundance of functional genes associated with toluene, benzoate and PAHs degradation pathways was higher than that of control based on KEGG database.
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Affiliation(s)
- Weichao Xu
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China; Beijing Engineering Research Centre of Process Pollution Control, Division of Environmental Engineering and Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Yuxiu Zhang
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China.
| | - Hongbin Cao
- Beijing Engineering Research Centre of Process Pollution Control, Division of Environmental Engineering and Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China; National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Yuxing Sheng
- Beijing Engineering Research Centre of Process Pollution Control, Division of Environmental Engineering and Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China; National Key Laboratory of Biochemical Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Haibo Li
- Beijing Engineering Research Centre of Process Pollution Control, Division of Environmental Engineering and Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Yuping Li
- Beijing Engineering Research Centre of Process Pollution Control, Division of Environmental Engineering and Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - He Zhao
- Beijing Engineering Research Centre of Process Pollution Control, Division of Environmental Engineering and Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
| | - Xuefei Gui
- School of Chemical and Environmental Engineering, China University of Mining and Technology (Beijing), Beijing 100083, PR China; Beijing Engineering Research Centre of Process Pollution Control, Division of Environmental Engineering and Technology, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China
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