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Hu C, Yang Z, Chen Y, Tang J, Zeng L, Peng C, Chen L, Wang J. Unlocking soil revival: the role of sulfate-reducing bacteria in mitigating heavy metal contamination. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2024; 46:417. [PMID: 39240407 DOI: 10.1007/s10653-024-02190-1] [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: 04/25/2024] [Accepted: 08/23/2024] [Indexed: 09/07/2024]
Abstract
Soil contamination with heavy metals from industrial and mining activities poses significant environmental and public health risks, necessitating effective remediation strategies. This review examines the utilization of sulfate-reducing bacteria (SRB) for bioremediation of heavy metal-contaminated soils. Specifically, it focuses on SRB metabolic pathways for heavy metal immobilization, interactions with other microorganisms, and integration with complementary remediation techniques such as soil amendments and phytoremediation. We explore the mechanisms of SRB action, their synergistic relationships within soil ecosystems, and the effectiveness of combined remediation approaches. Our findings indicate that SRB can effectively immobilize heavy metals by converting sulfate to sulfide, forming stable metal sulfides, thereby reducing the bioavailability and toxicity of heavy metals. Nevertheless, challenges persist, including the need to optimize environmental conditions for SRB activity, address their sensitivity to acidic conditions and high heavy metal concentrations, and mitigate the risk of secondary pollution from excessive carbon sources. This study underscores the necessity for innovative and sustainable SRB-based bioremediation strategies that integrate multiple techniques to address the complex issue of heavy metal soil contamination. Such advancements are crucial for promoting green mining practices and environmental restoration.
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Affiliation(s)
- Cheng Hu
- School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, Sichuan, China
| | - Zhendong Yang
- School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, Sichuan, China.
- Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Building Materials Conversion and Utilization Technology, Chengdu, 610106, Sichuan, China.
| | - Yijing Chen
- School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, Sichuan, China
| | - Jiayi Tang
- School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, Sichuan, China
| | - Li Zeng
- School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, Sichuan, China
- Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Building Materials Conversion and Utilization Technology, Chengdu, 610106, Sichuan, China
| | - Cong Peng
- School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, Sichuan, China
| | - Liudong Chen
- School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, Sichuan, China
| | - Jing Wang
- School of Architecture and Civil Engineering, Chengdu University, Chengdu, 610106, Sichuan, China
- Sichuan Provincial Engineering Research Center of City Solid Waste Energy and Building Materials Conversion and Utilization Technology, Chengdu, 610106, Sichuan, China
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Chen Z, Gao S, Zhu S, Yu J, Wen X. Continuous chain elongation process for carbon resource recovery from excess sludge: Enhanced n-caprylate production and specific microbial functionalities. BIORESOURCE TECHNOLOGY 2024; 406:130937. [PMID: 38852892 DOI: 10.1016/j.biortech.2024.130937] [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: 02/03/2024] [Revised: 05/29/2024] [Accepted: 06/06/2024] [Indexed: 06/11/2024]
Abstract
Thermal hydrolyzed sludge (THS) exhibits considerable promise in generating medium-chain fatty acids (MCFAs) through chain elongation (CE) technology. This study developed a novel continuous CE process using THS as the substrate, achieving an optimal ethanol loading rate (5.8 g COD/L/d) and stable MCFA production at 10.9 g COD/L, with a rate of 3.6 g COD/L/d. The MCFAs primarily comprised n-caproate and n-caprylate, representing 41.5 % and 54.3 % of the total MCFAs, respectively. Utilization efficiencies for ethanol and acetate were nearly complete at 100 % and 92.8 %, respectively. Key microbial taxa identified under these optimal conditions included Alcaligenes, SRB2, Sporanaerobacter, and Kurthia, which were instrumental in critical pathways such as the generation of acetyl-CoA, the initial carboxylation of acetyl-CoA, the fatty acid biosynthesis cycle, and energy metabolism. This research provides a theoretical and technical blueprint for converting waste sludge into valuable MCFAs, promoting sustainable waste-to-resource strategies.
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Affiliation(s)
- Zhan Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Shan Gao
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Shihui Zhu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Jinlan Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Xianghua Wen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.
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3
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Gao S, Chen Z, Zhu S, Yu J, Wen X. Enhancement of medium-chain fatty acids production from sludge anaerobic fermentation liquid under moderate sulfate reduction. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 354:120459. [PMID: 38402788 DOI: 10.1016/j.jenvman.2024.120459] [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: 09/21/2023] [Revised: 01/10/2024] [Accepted: 02/20/2024] [Indexed: 02/27/2024]
Abstract
In recent years, there has been a marked increase in the production of excess sludge. Chain-elongation (CE) fermentation presents a promising approach for carbon resource recovery from sludge, enabling the transformation of carbon into medium-chain fatty acids (MCFAs). However, the impact of sulfate, commonly presents in sludge, on the CE process remains largely unexplored. In this study, batch tests for CE process of sludge anaerobic fermentation liquid (SAFL) under different SCOD/SO42- ratios were performed. The moderate sulfate reduction under the optimum SCOD/SO42- of 20:1 enhanced the n-caproate production, giving the maximum n-caproate concentration, selectivity and production rate of 5.49 g COD/L, 21.4% and 4.87 g COD/L/d, respectively. The excessive sulfate reduction under SCOD/SO42- ≤ 5 completely inhibited the CE process, resulting in almost no n-caproate generation. The variations in n-caproate production under different conditions of SCOD/SO42- were all well fitted with the modified Gompertz kinetic model. Alcaligenes and Ruminococcaceae_UCG-014 were the dominant genus-level biomarkers under moderate sulfate reduction (SCOD/SO42- = 20), which enhanced the n-caproate production by increasing the generation of acetyl-CoA and the hydrolysis of difficult biodegradable substances in SAFL. The findings presented in this work elucidate a strategy and provide a theoretical framework for the further enhancement of MCFAs production from excess sludge.
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Affiliation(s)
- Shan Gao
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Zhan Chen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
| | - Shihui Zhu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Jinlan Yu
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China
| | - Xianghua Wen
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing, 100084, China.
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Logan M, Zhu F, Lens PNL, Cetecioglu Z. Influence of pH, Heat Treatment of Inoculum, and Selenium Oxyanions on Concomitant Selenium Bioremediation and Volatile Fatty Acid Production from Food Waste. ACS OMEGA 2023; 8:34397-34409. [PMID: 37779932 PMCID: PMC10535259 DOI: 10.1021/acsomega.2c06459] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 08/24/2023] [Indexed: 10/03/2023]
Abstract
Developing novel strategies to enhance volatile fatty acid (VFA) yield from abundant waste resources is imperative to improve the competitiveness of biobased VFAs over petrochemical-based VFAs. This study hypothesized to improve the VFA yield from food waste via three strategies, viz., pH adjustment (5 and 10), supplementation of selenium (Se) oxyanions, and heat treatment of the inoculum (at 85 °C for 1 h). The highest VFA yield of 0.516 g COD/g VS was achieved at alkaline pH, which was 45% higher than the maximum VFA production at acidic pH. Heat treatment resulted in VFA accumulation after day 10 upon alkaline pretreatment. Se oxyanions acted as chemical inhibitors to improve the VFA yield at pH 10 with non-heat-treated inoculum (NHT). Acetic and propionic acid production was dominant at alkaline pH (NHT); however, the VFA composition diversified under the other tested conditions. More than 95% Se removal was achieved on day 1 under all the conditions tested. However, the heat treatment was detrimental for selenate reduction, with less than 15% Se removal after 20 days. Biosynthesized Se nanoparticles were confirmed by transmission and scanning electron microscopy and and energy dispersive X-ray analyses. The heat treatment inhibited the presence of nonsporulating bacteria and methanogenic archaea (Methanobacteriaceae). High-throughput sequencing also revealed higher relative abundances of the bacterial families (such as Clostridiaceae, Bacteroidaceae, and Prevotellaceae) that are capable of VFA production and/or selenium reduction.
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Affiliation(s)
- Mohanakrishnan Logan
- Department
of Chemical Engineering, School of Engineering Sciences in Chemistry,
Biotechnology and Health, KTH Royal Institute
of Technology, Stockholm SE 100 44, Sweden
- Department
of Microbiology, School of Natural Sciences and Ryan Institute, National University of Ireland, University Road, Galway H91 TK33, Ireland
| | - Fengyi Zhu
- Department
of Industrial Biotechnology, School of Engineering Sciences in Chemistry,
Biotechnology and Health, KTH Royal Institute
of Technology, Stockholm SE 106 91, Sweden
| | - Piet N. L. Lens
- Department
of Microbiology, School of Natural Sciences and Ryan Institute, National University of Ireland, University Road, Galway H91 TK33, Ireland
| | - Zeynep Cetecioglu
- Department
of Chemical Engineering, School of Engineering Sciences in Chemistry,
Biotechnology and Health, KTH Royal Institute
of Technology, Stockholm SE 100 44, Sweden
- Department
of Industrial Biotechnology, School of Engineering Sciences in Chemistry,
Biotechnology and Health, KTH Royal Institute
of Technology, Stockholm SE 106 91, Sweden
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Li H, Liu Z, Tan C, Zhang X, Zhang Z, Bai X, Wu L, Yang H. Efficient nitrogen removal from stormwater runoff by bioretention system: The construction of plant carbon source-based heterotrophic and sulfur autotrophic denitrification process. BIORESOURCE TECHNOLOGY 2022; 349:126803. [PMID: 35124218 DOI: 10.1016/j.biortech.2022.126803] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 01/25/2022] [Accepted: 01/28/2022] [Indexed: 06/14/2023]
Abstract
The plant carbon source and sulfur were selected as the denitrification electron donors and filled in the internal water storage zone (IWSZ) of bioretention system to establish excellent mixotrophic denitrification system, which was beneficial to waste recycling and showed very high nitrate nitrogen removal efficiency (approximately 94%). The ammonia nitrogen, total nitrogen, and chemical oxygen demand removal efficiencies could reach 79.41%, 85.89%, and 74.07%, respectively. Mechanism study revealed the synergistic degradation effect was existed between acetic acid released from plant carbon source and the generated sulfate, which improved the S/CH3COOH mediated nitrate nitrogen removal reactions. Autotrophic denitrification occurred mainly in the upper layer of IWSZ, and the dominant bacteria were Thiobacillus. While in the lower layer, the dominant bacteria were mainly related to organic matter utilization and heterotrophic denitrification. The abundance of narG, nirK, nirS, and nosZ functional genes in the upper layer was significantly higher than the lower layers.
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Affiliation(s)
- Haiyan Li
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
| | - Zhaoying Liu
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
| | - Chaohong Tan
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
| | - Xiaoran Zhang
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
| | - Ziyang Zhang
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
| | - Xiaojuan Bai
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
| | - Liyuan Wu
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China.
| | - Hua Yang
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture, Beijing 100044, China; Beijing Advanced Innovation Center for Future Urban Design, Beijing 100044, China
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Stuivenberg GA, Burton JP, Bron PA, Reid G. Why Are Bifidobacteria Important for Infants? Microorganisms 2022; 10:278. [PMID: 35208736 PMCID: PMC8880231 DOI: 10.3390/microorganisms10020278] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 01/14/2022] [Accepted: 01/20/2022] [Indexed: 02/04/2023] Open
Abstract
The presence of Bifidobacterium species in the maternal vaginal and fecal microbiota is arguably an evolutionary trait that allows these organisms to be primary colonizers of the newborn intestinal tract. Their ability to utilize human milk oligosaccharides fosters their establishment as core health-promoting organisms throughout life. A reduction in their abundance in infants has been shown to increase the prevalence of obesity, diabetes, metabolic disorder, and all-cause mortality later in life. Probiotic strains have been developed as supplements for premature babies and to counter some of these ailments as well as to confer a range of health benefits. The ability to modulate the immune response and produce short-chain fatty acids, particularly acetate and butyrate, that strengthen the gut barrier and regulate the gut microbiome, makes Bifidobacterium a core component of a healthy infant through adulthood.
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Affiliation(s)
- Gerrit A. Stuivenberg
- Centre for Human Microbiome and Probiotic Research, Lawson Health Research Institute, London, ON N6A4V2, Canada; (G.A.S.); (J.P.B.)
- Departments of Microbiology and Immunology and Surgery, Western University, London, ON N6A 3K7, Canada
| | - Jeremy P. Burton
- Centre for Human Microbiome and Probiotic Research, Lawson Health Research Institute, London, ON N6A4V2, Canada; (G.A.S.); (J.P.B.)
- Departments of Microbiology and Immunology and Surgery, Western University, London, ON N6A 3K7, Canada
| | | | - Gregor Reid
- Centre for Human Microbiome and Probiotic Research, Lawson Health Research Institute, London, ON N6A4V2, Canada; (G.A.S.); (J.P.B.)
- Departments of Microbiology and Immunology and Surgery, Western University, London, ON N6A 3K7, Canada
- Seed Health Inc., Venice, CA 90291, USA;
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7
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Daisley BA, Koenig D, Engelbrecht K, Doney L, Hards K, Al KF, Reid G, Burton JP. Emerging connections between gut microbiome bioenergetics and chronic metabolic diseases. Cell Rep 2021; 37:110087. [PMID: 34879270 DOI: 10.1016/j.celrep.2021.110087] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Revised: 11/03/2021] [Accepted: 11/10/2021] [Indexed: 12/25/2022] Open
Abstract
The conventional viewpoint of single-celled microbial metabolism fails to adequately depict energy flow at the systems level in host-adapted microbial communities. Emerging paradigms instead support that distinct microbiomes develop interconnected and interdependent electron transport chains that rely on cooperative production and sharing of bioenergetic machinery (i.e., directly involved in generating ATP) in the extracellular space. These communal resources represent an important subset of the microbial metabolome, designated here as the "pantryome" (i.e., pantry or external storage compartment), that critically supports microbiome function and can exert multifunctional effects on host physiology. We review these interactions as they relate to human health by detailing the genomic-based sharing potential of gut-derived bacterial and archaeal reference strains. Aromatic amino acids, metabolic cofactors (B vitamins), menaquinones (vitamin K2), hemes, and short-chain fatty acids (with specific emphasis on acetate as a central regulator of symbiosis) are discussed in depth regarding their role in microbiome-related metabolic diseases.
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Affiliation(s)
- Brendan A Daisley
- Department of Microbiology & Immunology, The University of Western Ontario, London, ON N6A 5C1, Canada; Canadian Centre for Human Microbiome and Probiotics Research, London, ON N6A 4V2, Canada
| | - David Koenig
- Kimberly Clark Corporation, Global Research and Engineering-Life Science, Neenah, WI, USA
| | - Kathleen Engelbrecht
- Kimberly Clark Corporation, Global Research and Engineering-Life Science, Neenah, WI, USA
| | - Liz Doney
- Kimberly Clark Corporation, Global Research and Engineering-Life Science, Neenah, WI, USA
| | - Kiel Hards
- Department of Microbiology and Immunology, University of Otago, Dunedin, Otago, New Zealand
| | - Kait F Al
- Department of Microbiology & Immunology, The University of Western Ontario, London, ON N6A 5C1, Canada; Canadian Centre for Human Microbiome and Probiotics Research, London, ON N6A 4V2, Canada
| | - Gregor Reid
- Department of Microbiology & Immunology, The University of Western Ontario, London, ON N6A 5C1, Canada; Canadian Centre for Human Microbiome and Probiotics Research, London, ON N6A 4V2, Canada; Department of Surgery, Division of Urology, Schulich School of Medicine, London, ON N6A 5C1, Canada
| | - Jeremy P Burton
- Department of Microbiology & Immunology, The University of Western Ontario, London, ON N6A 5C1, Canada; Canadian Centre for Human Microbiome and Probiotics Research, London, ON N6A 4V2, Canada; Department of Surgery, Division of Urology, Schulich School of Medicine, London, ON N6A 5C1, Canada.
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