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Tang Y, Chen J, Xiao Z, Liu Z, Xu L, Qin Q, Wang Y, Xu Y. Humin and biochar accelerated microbial reductive dechlorination of 2,4,6-trichlorophenol under weak electrical stimulation. JOURNAL OF HAZARDOUS MATERIALS 2022; 439:129671. [PMID: 36104900 DOI: 10.1016/j.jhazmat.2022.129671] [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: 04/13/2022] [Revised: 07/15/2022] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
The extracellular electron transfer (EET) is regarded as one of the crucial factors that limit the application of the bioelectrochemical system (BES). In this study, two different solid-phase redox mediators (RMs), biochar (1.2 g/L, T-B) and humin (1.2 g/L, T-H) were used for boosting the microorganisms accessing the electrons required for 2,4,6-TCP dechlorination under weak electrical stimulation (-0.278 V vs. Standard hydrogen electrode). BES with dissolved RM anthraquinone-2,6-disulfonate (AQDS 0.5 mmol/L, T-A) was used as a comparison. The results showed that dechlorination of 2,4,6-TCP could be greatly accelerated by biochar (1.78 d-1) and humin (1.50 d-1) than AQDS (0.24 d-1) and no RM control (T-M, 0.27 d-1). Moreover, phenol became the predominant dechlorination product in T-H (78.5 %) and T-B (63.0 %) instead of 4-CP in T-M (67.1 %) and T-A (89.8 %). Pseudomonas, Sulfurospirillum, Desulfuromonas, Dehalobacter, Anaeromyxobacter, and Dechloromonas belonging to Proteobacteria or Firmicutes rather than Chloroflexi might be responsible for the dechlorination activity. Notably, different RMs tended to stimulate distinct electroactive bacteria. Pseudomonas was the most abundant microorganism in T-M (41.92 %) and T-A (17.24 %), while Rhodobacter was most prevalent in T-H (20.04 %) and Azonexus was predominant in T-B (48.48 %). This study is essential in advancing the understanding of EET in BES for microbial degradation of organohalide contaminants under weak electrical stimulation.
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Affiliation(s)
- Yanqiang Tang
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China
| | - Jiafeng Chen
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China; Yancheng City Planning and Research Information Center, Yancheng, Jiangsu 224000, China
| | - Zhixing Xiao
- College of Urban Construction, Nanjing Tech University, Nanjing, Jiangsu 211816, China
| | - Zheming Liu
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China
| | - Lei Xu
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China
| | - Qingdong Qin
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China
| | - Yuqiao Wang
- Ctr Photoelectrochem & Devices, School of Chemistry and Chemistry Engineering, Southeast University, Nanjing, Jiangsu 211189, China
| | - Yan Xu
- Department of Municipal Engineering, School of Civil Engineering, Southeast University, Nanjing, Jiangsu 210096, China.
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Wen HQ, Ren HY, Xie GJ, Xing DF, Ren NQ, Liu BF. Accelerated start-up for photo-fermentative hydrogen production in biofilm reactor by adding waste effluent. ENVIRONMENTAL RESEARCH 2021; 198:111221. [PMID: 33971131 DOI: 10.1016/j.envres.2021.111221] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2020] [Revised: 02/28/2021] [Accepted: 04/22/2021] [Indexed: 06/12/2023]
Abstract
The difficulty and long duration of start-up wastes numerous costs, labors and time and a little fluctuate during the process might fail it. However, studies dealing with the problem hindering accelerated start-up are still insufficient. Current research focused to develop a method for accelerated start-up in an efficient way. This work outlined a novel alternative for accelerated start-up. This joint method, adding waste effluent with applying biofilm reactor, could successfully start up hydrogen production in the first 24 h via increasing ability of hydrogen producers while the control group produced little hydrogen. The two factors, biofilm formation and addition of waste effluent, expressed the combined effects on accelerated start-up. This study suggested that little molecules like quorum sensing system factors and indoles might be the crucial regulating and stimulating factors and express the accelerated start-up ability only in biofilm reactors.
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Affiliation(s)
- Han-Quan Wen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, P.O. Box 2614, 73 Huanghe Road, Harbin, 150090, China
| | - Hong-Yu Ren
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, P.O. Box 2614, 73 Huanghe Road, Harbin, 150090, China.
| | - Guo-Jun Xie
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, P.O. Box 2614, 73 Huanghe Road, Harbin, 150090, China
| | - De-Feng Xing
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, P.O. Box 2614, 73 Huanghe Road, Harbin, 150090, China
| | - Nan-Qi Ren
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, P.O. Box 2614, 73 Huanghe Road, Harbin, 150090, China
| | - Bing-Feng Liu
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, P.O. Box 2614, 73 Huanghe Road, Harbin, 150090, China.
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Li Y, Zhao J, Li Y, Jin B, Zhang K, Zhang H. Long-term alkaline conditions inhibit the relative abundances of tetracycline resistance genes in saline 4-chlorophenol wastewater treatment. BIORESOURCE TECHNOLOGY 2020; 301:122792. [PMID: 31978699 DOI: 10.1016/j.biortech.2020.122792] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Revised: 01/08/2020] [Accepted: 01/10/2020] [Indexed: 06/10/2023]
Abstract
Considering the occurrence and spread of antibiotic resistance genes (ARGs) pose significant risks to public health, the effects of long-term exposure to alkaline conditions on the relative abundances of tetracycline resistance genes (TRGs) were studied in saline 4-chlorophenol (4-CP) wastewater treatment. Alkaline conditions were maintained by supplying the co-metabolic carbon source of sodium acetate. Results showed that except for the 4-CP, the removal of pollutants was significantly inhibited, and the relative abundances of the most TRGs were repressed. In addition, the removal of pollutants and the relative abundances of TRGs were moderately affected by the NaCl addition. The proteins in the extracellular polymeric substances (EPS) played key roles in reducing the relative abundances of TRGs, which were altered by the microbial diversity. In conclusion, for the pollutants removal and ARGs reduction in refractory industrial wastewater treatment, alkaline conditions should be maintained by selecting suitable co-metabolic carbon sources.
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Affiliation(s)
- Yahe Li
- Key Laboratory of Applied Marine Biotechnology of Ministry of Education, Key Laboratory of Marine Biotechnology of Zhejiang, Ningbo University, Ningbo 315211, China
| | - Jianguo Zhao
- Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China.
| | - Yu Li
- Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Baodan Jin
- Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Ke Zhang
- Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
| | - Hongzhong Zhang
- Henan Collaborative Innovation Center of Environmental Pollution Control and Ecological Restoration, School of Material and Chemical Engineering, Zhengzhou University of Light Industry, Zhengzhou 450001, China
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Enhancement of tribromophenol removal in a sequencing batch reactor via submicron magnetite. Bioprocess Biosyst Eng 2020; 43:851-861. [DOI: 10.1007/s00449-020-02281-0] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Accepted: 01/01/2020] [Indexed: 10/25/2022]
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Song J, Zhao Q, Guo J, Yan N, Chen H, Sheng F, Lin Y, An D. The microbial community responsible for dechlorination and benzene ring opening during anaerobic degradation of 2,4,6‑trichlorophenol. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 651:1368-1376. [PMID: 30360268 DOI: 10.1016/j.scitotenv.2018.09.300] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/08/2018] [Revised: 09/22/2018] [Accepted: 09/22/2018] [Indexed: 06/08/2023]
Abstract
This study describes the dechlorination ability of acclimated biomass, the high-throughput sequencing of the 16S ribosomal RNA (rRNA) gene of such microorganisms, and the analysis of their community structure in relation to special functions. Two types of acclimated biomass (AB-1 and AB-2) were obtained via different acclimated treatment processes and were used to degrade 2,4,6‑trichlorophenol. The degradation pathway and characteristics of trichlorophenol degradation were different between the two groups. AB-1 degraded trichlorophenol only to 4-chlorophenol. AB-2 completely dechlorinated trichlorophenol and opened the benzene ring. The 16S rRNA high-throughput sequencing method was employed to examine the microbial diversity. It was found that the microbial richness and diversity of AB-1 were higher than those of AB-2. Firmicutes and Bacteroidetes were 2.7-fold and 4.3-fold more abundant, respectively, in AB-1 than in AB-2. Dechlorination bacteria in AB-1 mainly included Desulfobulbus, Desulfovibrio, Dechloromonas, and Geobacter. The above-mentioned bacteria were less abundant in AB-2, but the abundance of Desulfomicrobium was twofold higher in AB-2 than in AB-1. The two types of acclimated biomass contained different hydrogen (H2)-producing bacteria. AB-2 showed higher abundance and diversity of hydrogen-producing bacteria. There was no Ignavibacteriae in AB-1, whereas its abundance in AB-2 was 8.4%. In this biomass, Ignavibacteriae was responsible for opening of the benzene ring. This study indicates that the abundance and diversity of microorganisms are not necessarily beneficial to the formation of a functional dechlorinating community. The H2-producing bacteria (which showed greater abundance and diversity) and Ignavibacterium were assumed to be core functional populations that gave AB-2 stronger dechlorination and phenol-degradation abilities. Control of lower oxidation reduction potential (Eh) and higher temperatures by means of fresh aerobic activated sludge as the starting microbial group, caused rapid complete dechlorination of 2,4,6‑trichlorophenol and benzene ring opening.
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Affiliation(s)
- Jiaxiu Song
- College of Life and Environmental Science, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, PR China
| | - Qi Zhao
- College of Life and Environmental Science, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, PR China
| | - Jun Guo
- College of Life and Environmental Science, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, PR China
| | - Ning Yan
- College of Life and Environmental Science, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, PR China
| | - Huidong Chen
- College of Life and Environmental Science, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, PR China
| | - Fanfan Sheng
- School of Marxism, Tongji University, 1239 Siping road, Shanghai 200092, PR China
| | - Yujin Lin
- Department of Environmental Science & Engineering, Fudan University, 2205 Songhu Road, Shanghai 200438, PR China
| | - Dong An
- Department of Environmental Science & Engineering, Fudan University, 2205 Songhu Road, Shanghai 200438, PR China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, PR China.
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Dolfing J, Novak I. The Gibbs free energy of formation of halogenated benzenes, benzoates and phenols and their potential role as electron acceptors in anaerobic environments. Biodegradation 2014; 26:15-27. [PMID: 25231938 PMCID: PMC4305373 DOI: 10.1007/s10532-014-9710-5] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 08/25/2014] [Indexed: 12/04/2022]
Abstract
The sequence of redox reactions in the natural environment generally follows the electron affinity of the electron acceptors present and can be rationalized by the redox potentials of the appropriate half-reactions. Answering the question how halogenated aromatics fit into this sequence requires information on their Gibbs free energy of formation values. In 1992 Gibbs free energy data for various classes of halogenated aromatic compounds were systematically explored for the first time based on Benson’s group contribution method. Since then more accurate quantum chemical calculation methods have become available. Here we use these methods to estimate enthalpy and Gibbs free energy of formation values of all chlorinated and brominated phenols. These data and similar state-of-the-art datasets for halogenated benzenes and benzoates were then used to calculate two-electron redox potentials of halogenated aromatics for standard conditions and for pH 7. The results underline the need to take speciation into consideration when evaluating redox potentials at pH 7 and highlight the fact that halogenated aromatics are excellent electron acceptors in aqueous environments.
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Affiliation(s)
- Jan Dolfing
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle, NE1 7RU, England, UK,
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Anaerobic/aerobic conditions and biostimulation for enhanced chlorophenols degradation in biocathode microbial fuel cells. Biodegradation 2014; 25:615-32. [DOI: 10.1007/s10532-014-9686-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2013] [Accepted: 02/10/2014] [Indexed: 10/25/2022]
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Effect of 2,4,6-trichlorophenol on the microbial activity of adapted anaerobic granular sludge bioaugmented with Desulfitobacterium strains. N Biotechnol 2011; 29:79-89. [DOI: 10.1016/j.nbt.2011.06.011] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2011] [Revised: 06/10/2011] [Accepted: 06/13/2011] [Indexed: 11/17/2022]
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Zhao BH, Mu Y, Dong F, Ni BJ, Zhao JB, Sheng GP, Yu HQ, Li YY, Harada H. Dynamic Modeling the Anaerobic Reactor Startup Process. Ind Eng Chem Res 2010. [DOI: 10.1021/ie1001857] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bai-Hang Zhao
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China, University of Queensland, Advanced Water Management Centre, QLD 4072, Australia, Department of Civil Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Yang Mu
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China, University of Queensland, Advanced Water Management Centre, QLD 4072, Australia, Department of Civil Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Fang Dong
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China, University of Queensland, Advanced Water Management Centre, QLD 4072, Australia, Department of Civil Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Bing-Jie Ni
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China, University of Queensland, Advanced Water Management Centre, QLD 4072, Australia, Department of Civil Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Jin-Bao Zhao
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China, University of Queensland, Advanced Water Management Centre, QLD 4072, Australia, Department of Civil Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Guo-Ping Sheng
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China, University of Queensland, Advanced Water Management Centre, QLD 4072, Australia, Department of Civil Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Han-Qing Yu
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China, University of Queensland, Advanced Water Management Centre, QLD 4072, Australia, Department of Civil Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Yu-You Li
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China, University of Queensland, Advanced Water Management Centre, QLD 4072, Australia, Department of Civil Engineering, Tohoku University, Sendai 980-8579, Japan
| | - Hideki Harada
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China, University of Queensland, Advanced Water Management Centre, QLD 4072, Australia, Department of Civil Engineering, Tohoku University, Sendai 980-8579, Japan
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Dolfing J, Xu A, Head IM. Anomalous energy yields in thermodynamic calculations: importance of accounting for pH-dependent organic acid speciation. ISME JOURNAL 2010; 4:463-4. [PMID: 20164860 DOI: 10.1038/ismej.2010.14] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jan Dolfing
- School of Civil Engineering and Geosciences, Newcastle University, Newcastle upon Tyne, England, UK
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Mun CH, He J, Ng WJ. Pentachlorophenol dechlorination by an acidogenic sludge. WATER RESEARCH 2008; 42:3789-3798. [PMID: 18691730 DOI: 10.1016/j.watres.2008.07.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/16/2008] [Revised: 06/30/2008] [Accepted: 07/08/2008] [Indexed: 05/26/2023]
Abstract
This study reports the feasibility of removing pentachlorophenol (PCP) by an acidogenic process in batch reactors. When the acidogenic sludge was first acclimated with 2,4,6-trichlorophenol (2,4,6-TCP) and developed 2,4,6-TCP dechlorinating activity, PCP could be ortho-dechlorinated to 3,4,5,-trichlorophenol (3,4,5-TCP) via 2,3,4,5-tetrachlorophenol as the intermediary. However, due to PCP's higher hydrophobicity and its higher expected Gibbs free energy yield, it was adsorbed to the sludge and dechlorinated preferentially to 2,4,6-TCP. This resulted in the inhibition of 2,4,6-TCP dechlorination. PCP removal under acidogenic condition was attributed to both reductive dechlorination and adsorption. At low PCP loads of 0.48micromoles/gMLVSS.d, dechlorination was the dominant removal mechanism (69% of total removal), while at the higher PCP load of 9.3micromoles/gMLVSS.d, adsorption was the main mechanism (82% of total removal). Attempts to induce meta or para position dechlorination of PCP failed when using meta position chlorophenols such as 2,3,6-TCP, 3,4,5-TCP and 3,5-DCP as the initial substrates. Overall, acidogenic biotreatment was an effective process in reducing PCP loads prior to downstream biological treatment.
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Affiliation(s)
- Cheok Hong Mun
- Division of Environmental Science & Engineering, National University of Singapore, Singapore 117576.
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