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Xu B, Su Q, Yang Y, Huang S, Yang Y, Shi X, Choo KH, Ng HY, Lee CH. Quorum Quenching in Membrane Bioreactors for Fouling Retardation: Complexity Provides Opportunities. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024. [PMID: 39012227 DOI: 10.1021/acs.est.4c04535] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/17/2024]
Abstract
The occurrence of biofouling restricts the widespread application of membrane bioreactors (MBRs) in wastewater treatment. Regulation of quorum sensing (QS) is a promising approach to control biofouling in MBRs, yet the underlying mechanisms are complex and remain to be illustrated. A fundamental understanding of the relationship between QS and membrane biofouling in MBRs is lacking, which hampers the development and application of quorum quenching (QQ) techniques in MBRs (QQMBRs). While many QQ microorganisms have been isolated thus far, critical criteria for selecting desirable QQ microorganisms are still missing. Furthermore, there are inconsistent results regarding the QQ lifecycle and the effects of QQ on the physicochemical characteristics and microbial communities of the mixed liquor and biofouling assemblages in QQMBRs, which might result in unreliable and inefficient QQ applications. This review aims to comprehensively summarize timely QQ research and highlight the important yet often ignored perspectives of QQ for biofouling control in MBRs. We consider what this "information" can and cannot tell us and explore its values in addressing specific and important questions in QQMBRs. Herein, we first examine current analytical methods of QS signals and discuss the critical roles of QS in fouling-forming microorganisms in MBRs, which are the cornerstones for the development of QQ technologies. To achieve targeting QQ strategies in MBRs, we propose the substrate specificity and degradation capability of isolated QQ microorganisms and the surface area and pore structures of QQ media as the critical criteria to select desirable functional microbes and media, respectively. To validate the biofouling retardation efficiency, we further specify the QQ effects on the physicochemical properties, microbial community composition, and succession of mixed liquor and biofouling assemblages in MBRs. Finally, we provide scale-up considerations of QQMBRs in terms of the debated QQ lifecycle, practical synergistic strategies, and the potential cost savings of MBRs. This review presents the limitations of classic QS/QQ hypotheses in MBRs, advances the understanding of the role of QS/QQ in biofouling development/retardation in MBRs, and builds a bridge between the fundamental understandings and practical applications of QQ technology.
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Affiliation(s)
- Boyan Xu
- Center for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China
- Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore
| | - Qingxian Su
- Center for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China
- Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore
- Department of Environmental Engineering, Technical University of Denmark, Lyngby 2800, Denmark
| | - Yuxin Yang
- Center for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China
| | - Shujuan Huang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, 11 Fushun Road, Qingdao, 266033, PR China
| | - Yue Yang
- Corporate Sustainability Office, TÜV SÜD, Westendstr. 199, 80686 München, Germany
| | - Xueqing Shi
- School of Environmental and Municipal Engineering, Qingdao University of Technology, 11 Fushun Road, Qingdao, 266033, PR China
| | - Kwang-Ho Choo
- Department of Environmental Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu 702-701, Republic of Korea
| | - How Yong Ng
- Center for Water Research, Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China
- Department of Civil and Environmental Engineering, National University of Singapore, 117576, Singapore
| | - Chung-Hak Lee
- School of Chemical and Biological Engineering, Seoul National University, Seoul, 08826, Republic of Korea
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Cao CY, Hou ZJ, Ding MZ, Gao GR, Qiao B, Wei SY, Cheng JS. Integrated Biofilm Modification and Transcriptional Analysis for Improving Fengycin Production in Bacillus amyloliquefaciens. Probiotics Antimicrob Proteins 2024:10.1007/s12602-024-10266-8. [PMID: 38652228 DOI: 10.1007/s12602-024-10266-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/17/2024] [Indexed: 04/25/2024]
Abstract
Although fengycin exhibits broad-spectrum antifungal properties, its application is hindered due to its low biosynthesis level and the co-existence of iturin A and surfactin in Bacillus amyloliquefaciens HM618, a probiotic strain. In this study, transcriptome analysis and gene editing were used to explore the potential mechanisms regulating fengycin production in B. amyloliquefaciens. The fengycin level of B. amyloliquefacien HM-3 (∆itu-ΔsrfAA) was 88.41 mg/L after simultaneously inhibiting the biosyntheses of iturin A and surfactin. The knockout of gene eps associated with biofilm formation significantly increased the fengycin level of the strain HM618, whereas the fengycin level decreased 32.05% after knocking out sinI, a regulator of biofilm formation. Transcriptome analysis revealed that the differentially expressed genes, involved in pathways of amino acid and fatty acid syntheses, were significantly down-regulated in the recombinant strains, which is likely associated with a decrease of fengycin production. The knockout of gene comQXPA and subsequent transcriptome analysis revealed that the ComQXPA quorum sensing system played a positive regulatory role in fengycin production. Through targeted genetic modifications and fermentation optimization, the fengycin production of the engineered strain HM-12 (∆itu-ΔsrfAA-ΔyvbJ) in a 5-L fermenter reached 1.172 g/L, a 12.26-fold increase compared to the fengycin level in the strain HM-3 (∆itu-ΔsrfAA) in the Erlenmeyer flask. Taken together, these results reveal the underlying metabolic mechanisms associated with fengycin synthesis and provide a potential strategy for improving fengycin production in B. amyloliquefaciens.
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Affiliation(s)
- Chun-Yang Cao
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
- Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
| | - Zheng-Jie Hou
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
- Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
| | - Ming-Zhu Ding
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
- Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
| | - Geng-Rong Gao
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
- Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
| | - Bin Qiao
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
| | - Si-Yu Wei
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
- Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China
| | - Jing-Sheng Cheng
- Frontiers Science Center for Synthetic Biology and Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China.
- Department of Pharmaceutical Engineering, School of Chemical Engineering and Technology, Tianjin University, Yaguan Road 135, Tianjin, 300350, People's Republic of China.
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Wu Y, Liu X, Liang D, Li D, Li J, Guo W, Wang X. Carbon metabolism characteristics of quorum quenching bacteria Rhodococcus sp. BH4 determine the bioaugmentation efficiency under different carbon source conditions. WATER RESEARCH 2024; 251:121168. [PMID: 38266439 DOI: 10.1016/j.watres.2024.121168] [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: 09/26/2023] [Revised: 01/16/2024] [Accepted: 01/17/2024] [Indexed: 01/26/2024]
Abstract
Carbon sources are critical factors influencing bacterial bioaugmentation, however, the underlying mechanisms, particularly the metabolic characteristics of bioaugmented bacteria remain poorly understood. The bioaugmented bacterium Rhodococcus sp. BH4 secretes the quorum quenching (QQ) enzyme QsdA to disrupt the quorum sensing (QS) in the activated sludge (AS) process, reducing AS yield in-situ. This study investigated the carbon metabolic characteristics of BH4 and explored the effects on bioaugmentation with different influent carbon sources. Because of the absence of glucose-specific phosphoenol phosphotransferase system (PTS), BH4 prefers sodium acetate to glucose. However, the lactones produced during extracellular glucose metabolism enhance BH4 qsdA expression. Moreover, BH4 possess carbon catabolite repression (CCR), acetate inhibits glucose utilization. BH4 microbeads were added to reactors with different carbon sources (R1: sodium acetate; R2: glucose; R3: a mixture of sodium acetate and glucose) for in-situ AS yield reduction. During operation, AS reduction efficiency decreased in the following order: R1 > R3 > R2. R2 and R3 microbeads exhibited similar QQ activity to R1, with less BH4 biomass at 5 d. 13C labeling and Michaelis-Menten equation showed that, due to differences in the competitiveness of carbon sources, R1 BH4 obtained the most carbon, whereas R2 BH4 obtained the least carbon. Moreover, acetate inhibited glucose utilization of R3 BH4. Transcriptome analysis showed that R1 BH4 qsdA expression was the lowest, R2 BH4 was the most serious form of programmed cell death, and the R3 BH4 PTS pathway was inhibited. At 10 d, R1 BH4 biomass and microbead QQ activity were higher than that in R3, and the R2 BH4 lost viability and QQ activity. This study provides new insights into bioaugmentation from the perspectives of carbon source competitiveness, carbon metabolism pathways, and CCR.
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Affiliation(s)
- Yaodong Wu
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Pingleyuan 100, Chaoyang, Beijing 100124, China
| | - Xiaohui Liu
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Pingleyuan 100, Chaoyang, Beijing 100124, China
| | - Dongbo Liang
- China Urban Construction Design & Research Institute CO., LTD. Beijing 100120, China
| | - Dongyue Li
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Pingleyuan 100, Chaoyang, Beijing 100124, China
| | - Jun Li
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Pingleyuan 100, Chaoyang, Beijing 100124, China.
| | - Wei Guo
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Pingleyuan 100, Chaoyang, Beijing 100124, China.
| | - Xiujie Wang
- The College of environmental and chemical engineering, Jiangsu University of Science and Technology, Zhenjiang, 212100, China
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Liu Z, Pang H, Yi K, Wang X, Zhang W, Zhang C, Liu S, Gu Y, Huang J, Shi L. Isolation and application of Bacillus thuringiensis LZX01: Efficient membrane biofouling mitigation function and anti-toxicity potential. BIORESOURCE TECHNOLOGY 2024; 394:130272. [PMID: 38185444 DOI: 10.1016/j.biortech.2023.130272] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 12/27/2023] [Accepted: 12/27/2023] [Indexed: 01/09/2024]
Abstract
Significant progress has been made in mitigating membrane biofouling by microbial quorum quenching (QQ). More efficient and survivable QQ strains need to be discovered. A new strain named Bacillus thuringiensis LZX01 was isolated in this study using a low carbon source concentration "starving" method from a membrane bioreactor (MBR). LZX01 secreted intracellular lactonase to enable QQ behavior and was capable of degrading 90 % of C8-HSL (200 ng/mL) within 30 min, which effectively delayed biofouling by inhibiting the growth of bacteria associated with biofouling and improving the hydrophilicity of bound extracellular polymeric substances. As a result, the membrane biofouling rate of MBR adding LZX01 was four times slower than that of the control MBR. Importantly, LZX01 maintains its QQ activity even in environments contaminated with typical toxic pollutants. Therefore, with high efficiency, toxicity resistance, and easy culture, LZX01 holds great potential and significant promise for biofouling control applications.
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Affiliation(s)
- Zhexi Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Haoliang Pang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Kaixin Yi
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Xia Wang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Wei Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Chenyu Zhang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Si Liu
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China
| | - Yanling Gu
- College of Materials Science and Engineering, Changsha University of Science and Technology, Changsha 410114, China
| | - Jinhui Huang
- College of Environmental Science and Engineering, Hunan University, Changsha, Hunan 410082, China; Key Laboratory of Environmental Biology and Pollution Control, Hunan University, Ministry of Education, Changsha, Hunan 410082, China.
| | - Lixiu Shi
- School of Hydraulic and Environmental Engineering, Changsha University of Science & Technology, Changsha 410114,China; Key Laboratory of Dongting Lake Aquatic Eco-Environmental Control and Restoration of Hunan Province, Changsha 410114, China.
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Kim Y, Anburajan P, Kim H, Oh HS. Inhibiting Biofilm Formation via Simultaneous Application of Nitric Oxide and Quorum Quenching Bacteria. MEMBRANES 2023; 13:836. [PMID: 37888008 PMCID: PMC10608578 DOI: 10.3390/membranes13100836] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Revised: 10/17/2023] [Accepted: 10/19/2023] [Indexed: 10/28/2023]
Abstract
Membrane biofouling is an inevitable challenge in membrane-based water treatment systems such as membrane bioreactors. Recent studies have shown that biological approaches based on bacterial signaling can effectively control biofilm formation. Quorum quenching (QQ) is known to inhibit biofilm growth by disrupting quorum sensing (QS) signaling, while nitric oxide (NO) signaling helps to disperse biofilms. In this study, batch biofilm experiments were conducted to investigate the impact of simultaneously applying NO signaling and QQ for biofilm control using Pseudomonas aeruginosa PAO1 as a model microorganism. The NO treatment involved the injection of NONOates (NO donor compounds) into mature biofilms, while QQ was implemented by immobilizing QQ bacteria (Escherichia coli TOP10-AiiO or Rhodococcus sp. BH4) in alginate or polyvinyl alcohol/alginate beads to preserve the QQ activity. When QQ beads were applied together with (Z)-1-[N-(3-aminopropyl)-N-(n-propyl) amino]diazen-1-ium-1,2-diolate (PAPA NONOate), they achieved a 39.0% to 71.3% reduction in biofilm formation, which was substantially higher compared to their individual applications (16.0% to 54.4%). These findings highlight the significant potential of combining QQ and NO technologies for effective biofilm control across a variety of processes that require enhanced biofilm inhibition.
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Affiliation(s)
- Youkyoung Kim
- Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea; (Y.K.); (P.A.); (H.K.)
| | - Parthiban Anburajan
- Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea; (Y.K.); (P.A.); (H.K.)
- Institute of Environmental Technology, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
| | - Hyeok Kim
- Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea; (Y.K.); (P.A.); (H.K.)
| | - Hyun-Suk Oh
- Department of Environmental Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea; (Y.K.); (P.A.); (H.K.)
- Institute of Environmental Technology, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea
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Wang Q, Bai X, Miao Q, Wang T, Wang X, Xu Q. Isolation and characterization of quorum quenching bacteria from municipal solid waste and bottom ash co-disposal landfills. WASTE MANAGEMENT & RESEARCH : THE JOURNAL OF THE INTERNATIONAL SOLID WASTES AND PUBLIC CLEANSING ASSOCIATION, ISWA 2023; 41:1480-1485. [PMID: 36912483 DOI: 10.1177/0734242x231155807] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Co-landfilling of bottom ash (BA) accelerates the clogging of leachate collection systems (LCSs) and increases the risk of landfill failure. The clogging was mainly associated with bio-clogging, which may be reduced by quorum quenching (QQ) strategies. This communication reports on a study of how isolated facultative QQ bacterial strains from municipal solid waste (MSW) landfills and BA co-disposal landfills. In MSW landfills, two novel QQ strains (Brevibacillus agri and Lysinibacillus sp. YS11) can degrade the signal molecule hexanoyl-l-homoserine lactone (C6-HSL) and octanoyl-l-homoserine lactone (C8-HSL), respectively. Pseudomonas aeruginosa could degrade C6-HSL and C8-HSL in BA co-disposal landfills. Moreover, P. aeruginosa (0.98) was observed with a higher growth rate (OD600) compared to that of B. agri (0.27) and Lysinibacillus sp. YS11 (0.53). These results indicated that the QQ bacterial strains were associated with leachate characteristics and signal molecules and could be used for controlling bio-clogging in landfills.
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Affiliation(s)
- Qian Wang
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, PR China
| | - Xinyue Bai
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, PR China
| | - Qianming Miao
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, PR China
| | - Tong Wang
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, PR China
| | - Xue Wang
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, PR China
| | - Qiyong Xu
- School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen, PR China
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Maddela NR, Abiodun AS, Zhang S, Prasad R. Biofouling in Membrane Bioreactors-Mitigation and Current Status: a Review. Appl Biochem Biotechnol 2023; 195:5643-5668. [PMID: 36418712 DOI: 10.1007/s12010-022-04262-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/08/2022] [Indexed: 11/27/2022]
Abstract
Biological fouling as termed biofouling is caused by varied living organisms and is difficult to eliminate from the environment thus becoming a major issue during membrane bioreactors. Biofouling in membrane bioreactors (MBRs) is a crucial problem in increasing liquid pressure due to reduced pore diameter, clogging of the membrane pores, and alteration of the chemical composition of the water which greatly limits the growth of MBRs. Thus, membrane biofouling and/or microbial biofilms is a hot research topic to improve the market competitiveness of the MBR technology. Though several antibiofouling strategies (addition of bioflocculant or sponge into MBRs) came to light, biological approaches are sustainable and more practicable. Among the biological approaches, quorum sensing-based biofouling control (so-called quorum quenching) is an interesting and promising tool in combating biofouling issues in the MBRs. Several review articles have been published in the area of membrane biofouling and mitigation approaches. However, there is no single source of information about biofouling and/or biofilm formation in different environmental settings and respective problems, antibiofilm strategies and current status, quorum quenching, and its futurity. Thus, the objectives of the present review were to provide latest insights on mechanism of membrane biofouling, quorum sensing molecules, biofilm-associated problems in different environmental setting and antibiofilm strategies, special emphasis on quorum quenching, and its futurity in the biofilm/biofouling control. We believe that these insights greatly help in the better understanding of biofouling and aid in the development of sustainable antibiofouling strategies.
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Affiliation(s)
- Naga Raju Maddela
- Departmento de Ciencias Biológicas, Facultad de Ciencias de la Salud, Universidad Técnica de Manabí, Portoviejo, Ecuador
- Instituto de Investigación, Universidad Técnica de Manabí, Portoviejo, Ecuador
| | - Aransiola Sesan Abiodun
- Bioresources Development Centre, National Biotechnology Development Agency (NABDA), Ogbomoso, Nigeria
| | - Shaoqing Zhang
- School of Civil Engineering, Guangzhou University, Guangzhou, 510006, People's Republic of China
| | - Ram Prasad
- Department of Botany, Mahatma Gandhi Central University, Motihari, Bihar, India.
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Biofilm-based technology for industrial wastewater treatment: current technology, applications and future perspectives. World J Microbiol Biotechnol 2023; 39:112. [PMID: 36907929 DOI: 10.1007/s11274-023-03567-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2023] [Accepted: 03/03/2023] [Indexed: 03/14/2023]
Abstract
The microbial community in biofilm is safeguarded from the action of toxic chemicals, antimicrobial compounds, and harsh/stressful environmental circumstances. Therefore, biofilm-based technology has nowadays become a successful alternative for treating industrial wastewater as compared to suspended growth-based technologies. In biofilm reactors, microbial cells are attached to static or free-moving materials to form a biofilm which facilitates the process of liquid and solid separation in biofilm-mediated operations. This paper aims to review the state-of-the-art of recent research on bacterial biofilm in industrial wastewater treatment including biofilm fundamentals, possible applications and problems, and factors to regulate biofilm formation. We discussed in detail the treatment efficiencies of fluidized bed biofilm reactor (FBBR), trickling filter reactor (TFR), rotating biological contactor (RBC), membrane biofilm reactor (MBfR), and moving bed biofilm reactor (MBBR) for different types of industrial wastewater treatment. Besides, biofilms have many applications in food and agriculture, biofuel and bioenergy production, power generation, and plastic degradation. Furthermore, key factors for regulating biofilm formation were also emphasized. In conclusion, industrial applications make evident that biofilm-based treatment technology is impactful for pollutant removal. Future research to address and improve the limitations of biofilm-based technology in wastewater treatment is also discussed.
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Huang D, Wang Y, Xiao J, Wang Y, Zhu X, Xu B, Wang M. Scavenging of reactive oxygen species effectively reduces Pseudomonas aeruginosa biofilms through disrupting policing. ENVIRONMENTAL RESEARCH 2023; 220:115182. [PMID: 36586713 DOI: 10.1016/j.envres.2022.115182] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 12/22/2022] [Accepted: 12/27/2022] [Indexed: 06/17/2023]
Abstract
Biofilm formation is likely to contribute greatly to antibiotic resistance in bacteria and therefore the efficient removal of bacterial biofilms needs addressing urgently. Here, we reported that the supplement of non-inhibitory concentration of N-acetyl-L-cysteine (NAC), a common reactive oxygen species (ROS) scavenger, can significantly reduce the biomass of mature Pseudomonas aeruginosa biofilms (corroborated by crystal violet assay and laser scanning confocal microscopy). 1 mM NAC increased the cheater (ΔlasR mutant) frequency to 89.4 ± 1.5% in the evolved PAO1 after the 15-day treatment. Scavenging of ROS by NAC induced the collapse of P. aeruginosa biofilms, but it did not alter quorum sensing-regulated genes expression (e.g., hcnC and cioAB) and hydrogen cyanide production. The replenishment of public good protease contributed to the recovery of biofilm biomass, indicating the role of disrupting policing in biofilm inhibition. Furthermore, 7 typical ROS scavengers (e.g., superoxide dismutase, catalase and peroxidase, etc.) also effectively inhibited mature P. aeruginosa biofilms. This study demonstrates that scavenging of ROS can promote the selective control of P. aeruginosa biofilms through policing disruption as a targeted biofilm control strategy in complex water environments.
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Affiliation(s)
- Dan Huang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou, 310012, China
| | - Yujie Wang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, China
| | - Junwei Xiao
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, China
| | - Yufan Wang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, China
| | - Xinyu Zhu
- Eco-Environmental Science Research and Design Institute of Zhejiang Province, Hangzhou, 310007, China
| | - Baile Xu
- Institute of Soil and Water Resources and Environmental Science, College of Environment and Resource Sciences, Zhejiang University, Hangzhou, 310058, China
| | - Meizhen Wang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou, 310012, China.
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Li J, Li Z, Xie J, Xia Y, Gong W, Tian J, Zhang K, Yu E, Wang G. Quorum-quenching potential of recombinant PvdQ-engineered bacteria for biofilm formation. INTERNATIONAL MICROBIOLOGY : THE OFFICIAL JOURNAL OF THE SPANISH SOCIETY FOR MICROBIOLOGY 2023:10.1007/s10123-023-00329-1. [PMID: 36773196 DOI: 10.1007/s10123-023-00329-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2022] [Revised: 01/14/2023] [Accepted: 01/17/2023] [Indexed: 02/12/2023]
Abstract
Quorum sensing (QS) is a core mechanism for bacteria to regulate biofilm formation, and therefore, QS inhibition or quorum quenching (QQ) is used as an effective and economically feasible strategy against biofilms. In this study, the PvdQ gene encoding AHL acylase was introduced into Escherichia coli (DE3), and a PvdQ-engineered bacterium with highly efficient QQ activity was obtained and used to inhibit biofilm formation. Gene sequencing and western blot analysis showed that the recombinant pET-PvdQ strain was successfully constructed. The color reaction of Agrobacterium tumefaciens A136 indicated that PvdQ engineering bacteria had shown strong AHL signal molecule quenching activity and significantly inhibited the adhesion (motility) of Pseudomonas aeruginosa and biofilm formation of activated sludge bacteria in Membrane Bio-Reactor (MBR; inhibition rate 51-85%, p < 0.05). In addition, qRT-PCR testing revealed that recombinant PvdQ acylase significantly reduced the transcription level of QS biofilm formation-related genes (cdrA, pqsA, and lasR; p < 0.05). In this study, QQ genetically engineered bacteria enhanced by genetic engineering could effectively inhibit the QS signal transduction mechanism and have the potential to control biofilm formation of pathogenic bacteria in the aquaculture environment, providing an environmentally friendly and alternative antibiotic strategy to suppress biofilm contamination.
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Affiliation(s)
- Junlin Li
- College of Fisheries and Life Science, Shanghai Ocean University, Nanhui New City, No.999, Huchenghuan Rd, Shanghai, People's Republic of China
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), No.1 Xingyu Road, Xilang, Guangzhou, Liwan District, 510380, People's Republic of China
- Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou, 510380, China
| | - Zhifei Li
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), No.1 Xingyu Road, Xilang, Guangzhou, Liwan District, 510380, People's Republic of China
- Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou, 510380, China
| | - Jun Xie
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), No.1 Xingyu Road, Xilang, Guangzhou, Liwan District, 510380, People's Republic of China.
- Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou, 510380, China.
| | - Yun Xia
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), No.1 Xingyu Road, Xilang, Guangzhou, Liwan District, 510380, People's Republic of China
- Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou, 510380, China
| | - Wangbao Gong
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), No.1 Xingyu Road, Xilang, Guangzhou, Liwan District, 510380, People's Republic of China
- Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou, 510380, China
| | - Jingjing Tian
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), No.1 Xingyu Road, Xilang, Guangzhou, Liwan District, 510380, People's Republic of China
- Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou, 510380, China
| | - Kai Zhang
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), No.1 Xingyu Road, Xilang, Guangzhou, Liwan District, 510380, People's Republic of China
- Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou, 510380, China
| | - Ermeng Yu
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), No.1 Xingyu Road, Xilang, Guangzhou, Liwan District, 510380, People's Republic of China
- Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou, 510380, China
| | - Guangjun Wang
- Key Laboratory of Tropical and Subtropical Fishery Resource Application and Cultivation, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences (CAFS), No.1 Xingyu Road, Xilang, Guangzhou, Liwan District, 510380, People's Republic of China
- Guangdong Ecological Remediation of Aquaculture Pollution Research Center, Guangzhou, 510380, China
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Zhu X, Chen WJ, Bhatt K, Zhou Z, Huang Y, Zhang LH, Chen S, Wang J. Innovative microbial disease biocontrol strategies mediated by quorum quenching and their multifaceted applications: A review. FRONTIERS IN PLANT SCIENCE 2023; 13:1063393. [PMID: 36714722 PMCID: PMC9878147 DOI: 10.3389/fpls.2022.1063393] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/17/2022] [Accepted: 12/15/2022] [Indexed: 06/12/2023]
Abstract
With the increasing resistance exhibited by undesirable bacteria to traditional antibiotics, the need to discover alternative (or, at least, supplementary) treatments to combat chemically resistant bacteria is becoming urgent. Quorum sensing (QS) refers to a novel bacterial communication system for monitoring cell density and regulation of a network of gene expression that is mediated by a group of signaling molecules called autoinducers (AIs). QS-regulated multicellular behaviors include biofilm formation, horizontal gene transfer, and antibiotic synthesis, which are demonstrating increasing pathogenicity to plants and aquacultural animals as well as contamination of wastewater treatment devices. To inhibit QS-regulated microbial behaviors, the strategy of quorum quenching (QQ) has been developed. Different quorum quenchers interfere with QS through different mechanisms, such as competitively inhibiting AI perception (e.g., by QS inhibitors) and AI degradation (e.g., by QQ enzymes). In this review, we first introduce different signaling molecules, including diffusible signal factor (DSF) and acyl homoserine lactones (AHLs) for Gram-negative bacteria, AIPs for Gram-positive bacteria, and AI-2 for interspecies communication, thus demonstrating the mode of action of the QS system. We next exemplify the QQ mechanisms of various quorum quenchers, such as chemical QS inhibitors, and the physical/enzymatic degradation of QS signals. We devote special attention to AHL-degrading enzymes, which are categorized in detail according to their diverse catalytic mechanisms and enzymatic properties. In the final part, the applications and advantages of quorum quenchers (especially QQ enzymes and bacteria) are summarized in the context of agricultural/aquacultural pathogen biocontrol, membrane bioreactors for wastewater treatment, and the attenuation of human pathogenic bacteria. Taken together, we present the state-of-the-art in research considering QS and QQ, providing theoretical evidence and support for wider application of this promising environmentally friendly biocontrol strategy.
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Affiliation(s)
- Xixian Zhu
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Wen-Juan Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Kalpana Bhatt
- Department of Food Science, Purdue University, West Lafayette, IN, United States
| | - Zhe Zhou
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Yaohua Huang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Lian-Hui Zhang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Shaohua Chen
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou, China
| | - Junxia Wang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, Guangdong Province Key Laboratory of Microbial Signals and Disease Control, Integrative Microbiology Research Centre, South China Agricultural University, Guangzhou, China
- Guangdong Laboratory for Lingnan Modern Agriculture, College of Plant Protection, South China Agricultural University, Guangzhou, China
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Brienza M, Sauvêtre A, Ait-Mouheb N, Bru-Adan V, Coviello D, Lequette K, Patureau D, Chiron S, Wéry N. Reclaimed wastewater reuse in irrigation: Role of biofilms in the fate of antibiotics and spread of antimicrobial resistance. WATER RESEARCH 2022; 221:118830. [PMID: 35841791 DOI: 10.1016/j.watres.2022.118830] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2022] [Revised: 07/01/2022] [Accepted: 07/04/2022] [Indexed: 06/15/2023]
Abstract
Reclaimed wastewater associated biofilms are made up from diverse class of microbial communities that are continuously exposed to antibiotic residues. The presence of antibiotic resistance bacteria (ARB) and their associated antibiotic resistance genes (ARGs) ensures also a continuous selection pressure on biofilms that could be seen as hotspots for antibiotic resistance dissemination but can also play a role in antibiotic degradation. In this study, the antibiotic degradation and the abundance of four ARGs (qnrS, sul1, blaTEM, ermB), and two mobile genetic elements (MGEs) including IS613 and intl1, were followed in reclaimed wastewater and biofilm samples collected at the beginning and after 2 weeks of six antibiotics exposure (10 µg L-1). Antibiotics were partially degraded and remained above lowest minimum inhibitory concentration (MIC) for environmental samples described in the literature. The most abundant genes detected both in biofilms and reclaimed wastewater were sul1, ermB, and intl1. The relative abundance of these genes in biofilms increased during the 2 weeks of exposure but the highest values were found in control samples (without antibiotics pressure), suggesting that bacterial community composition and diversity are the driven forces for resistance selection and propagation in biofilms, rather than exposure to antibiotics. Planktonic and biofilm bacterial communities were characterized. Planktonic cells are classically defined "as free flowing bacteria in suspension" as opposed to the sessile state (the so-called biofilm): "a structured community of bacterial cells enclosed in a self-produced polymeric matrix and adherent to an inert or living. surface" as stated by Costerton et al. (1999). The abundance of some genera known to harbor ARG such as Streptococcus, Exiguobacterium, Acholeplasma, Methylophylaceae and Porphyromonadaceae increased in reclaimed wastewater containing antibiotics. The presence of biofilm lowered the level of these genera in wastewater but, at the opposite, could also serve as a reservoir of these bacteria to re-colonize low-diversity wastewater. It seems that maintaining a high diversity is important to limit the dissemination of antimicrobial resistance among planktonic bacteria. Antibiotics had no influence on the biofilm development monitored with optical coherence tomography (OCT). Further research is needed in order to clarify the role of inter-species communication in biofilm on antibiotic degradation and resistance development and spreading.
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Affiliation(s)
- M Brienza
- Department of Science, University of Basilicata, Via dell'Ateneo Lucano 10, Potenza 85100, Italy; UMR HydroSciences Montpellier, Montpellier University - CNRS - IRD - IMT Mines Alès, 15 Ave Charles Flahault, Montpellier Cedex 5, 34093, France; INRAE, UMR G-EAU, Université Montpellier, Avenue Jean-François Breton, Montpellier 34000, France.
| | - A Sauvêtre
- UMR HydroSciences Montpellier, Montpellier University - CNRS - IRD - IMT Mines Alès, 15 Ave Charles Flahault, Montpellier Cedex 5, 34093, France; IMT Mines Ales, IRD, CNRS, HydroSciences Montpellier, Université Montpellier, Ales 30100, France; INRAE, UMR G-EAU, Université Montpellier, Avenue Jean-François Breton, Montpellier 34000, France
| | - N Ait-Mouheb
- INRAE, UMR G-EAU, Université Montpellier, Avenue Jean-François Breton, Montpellier 34000, France
| | - V Bru-Adan
- INRAE, LBE, Université Montpellier, 102, Avenue des Etangs, Narbonne 11100, France
| | - D Coviello
- Department of Science, University of Basilicata, Via dell'Ateneo Lucano 10, Potenza 85100, Italy; Department of Engineering, University of Naples Parthenope, Centro Direzionale Isola C/4 80 143, Naples, Italy
| | - K Lequette
- INRAE, UMR G-EAU, Université Montpellier, Avenue Jean-François Breton, Montpellier 34000, France; INRAE, LBE, Université Montpellier, 102, Avenue des Etangs, Narbonne 11100, France
| | - D Patureau
- INRAE, LBE, Université Montpellier, 102, Avenue des Etangs, Narbonne 11100, France.
| | - S Chiron
- UMR HydroSciences Montpellier, Montpellier University - CNRS - IRD - IMT Mines Alès, 15 Ave Charles Flahault, Montpellier Cedex 5, 34093, France
| | - N Wéry
- INRAE, LBE, Université Montpellier, 102, Avenue des Etangs, Narbonne 11100, France
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