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Luo J, Wu Y, Fu H, Fu M, Liu M, Guo H, Jin L, Wang S. Shift in microorganism and functional gene abundance during completely autotrophic nitrogen removal over nitrite (CANON) process. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 359:121009. [PMID: 38718600 DOI: 10.1016/j.jenvman.2024.121009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/01/2024] [Revised: 04/20/2024] [Accepted: 04/22/2024] [Indexed: 05/22/2024]
Abstract
Nitrification-denitrification process has failed to meet wastewater treatment standards. The completely autotrophic nitrite removal (CANON) process has a huge advantage in the field of low carbon/nitrogen wastewater nitrogen removal. However, slow start-up and system instability limit its applications. In this study, the time of the start-up CANON process was reduced by using bio-rope as loading materials. The establishing of graded dissolved oxygen improved the stability of the CANON process and enhanced the stratification effect between functional microorganisms. Microbial community structure and the abundance of nitrogen removal functional genes are also analyzed. The results showed that the CANON process was initiated within 75 days in the complete absence of anaerobic ammonium oxidizing bacteria (AnAOB) inoculation. The ammonium and nitrogen removal efficiencies of CANON process reached to 94.45% and 80.76% respectively. The results also showed that the relative abundance of nitrogen removal bacterial in the biofilm gradually increases with the dissolved oxygen content in the solution decreases. In contrast, the relative abundance of ammonia oxidizing bacteria was positively correlated with the dissolved oxygen content in the solution. The relative abundance of g__Candidatus_Brocadia in biofilm was 15.56%, and while g__Nitrosomonas was just 0.6613%. Metagenomic analysis showed that g__Candidatus_Brocadia also contributes 66.37% to the partial-nitrification functional gene Hao (K10535). This study presented a new idea for the cooperation between partial-nitrification and anammox, which improved the nitrogen removal system stability.
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Affiliation(s)
- Jiajun Luo
- Fujian Engineering and Research Center of Rural Sewage Treatment and Water Safety, Xiamen University of Technology, Xiamen, 361024, China
| | - Yicheng Wu
- Fujian Engineering and Research Center of Rural Sewage Treatment and Water Safety, Xiamen University of Technology, Xiamen, 361024, China
| | - Haiyan Fu
- Fujian Engineering and Research Center of Rural Sewage Treatment and Water Safety, Xiamen University of Technology, Xiamen, 361024, China.
| | - Muxing Fu
- Xiamen Zhongrenhemei Biotechnology Co., Xiamen, 361024, China
| | - Mian Liu
- Fujian Engineering and Research Center of Rural Sewage Treatment and Water Safety, Xiamen University of Technology, Xiamen, 361024, China
| | - Huibin Guo
- Fujian Engineering and Research Center of Rural Sewage Treatment and Water Safety, Xiamen University of Technology, Xiamen, 361024, China
| | - Lei Jin
- Fujian Engineering and Research Center of Rural Sewage Treatment and Water Safety, Xiamen University of Technology, Xiamen, 361024, China
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2
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Zeng L, Gao J, Cui Y, Wang Z, Zhao Y, Yuan Y, Xu H, Fu X. Insight into the evolution of microbial communities and resistance genes induced by sucralose in partial nitrification system with triclosan pre-exposure. JOURNAL OF HAZARDOUS MATERIALS 2024; 461:132581. [PMID: 37741209 DOI: 10.1016/j.jhazmat.2023.132581] [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: 07/10/2023] [Revised: 09/01/2023] [Accepted: 09/17/2023] [Indexed: 09/25/2023]
Abstract
Sucralose (SUC), an artificial sweetener widely used in food, beverages and pharmaceuticals, is frequently detected in various environmental matrices. Triclosan (TCS) is commonly used as a disinfectant and often co-exists with SUC in sewage environments. This study investigated the effects of SUC (0.1-10 mg/L) on the transmission of intracellular and extracellular antibiotic resistance genes (ARGs) in the partial nitrification systems with and without TCS pre-exposure. The reactors operated for 150 days, and SUC did not affect ammonia oxidation performance, while TCS led to the maintenance of partial nitrification. The types and abundances of extracellular ARGs in sludge and free ARGs in water increased significantly after TCS pre-exposure when faced SUC stress, which might be caused by a decrease in α-Helix/(β-Sheet + Random coil). SUC was more easily to enrich ARGs in partial nitrification systems with TCS pre-exposure, exacerbating the risk of ARGs transmission. The microbial community showed stronger relationships to cope with the direct stress of SUC, and the functional bacteria (Thauera and Nitrosomonas) in TCS pre-exposure system might be potential hosts of ARGs. This study might provide insights for better understanding the fates of SUC in partial nitrification systems and the ecological risks in wastewater containing TCS and SUC. ENVIRONMENTAL IMPLICATION: Sucralose (SUC) is often detected in the environment and considered as an emerging contaminant due to its soaring consumption and environmental persistence. Triclosan (TCS) is an antibacterial agent that often co-exists with SUC in personal care products and sewage environments. During 150 d, two partial nitrification reactors with and without TCS pre-exposure were established to study the effects of SUC on nitrification performance, antibiotic resistance genes (ARGs) and microbial communities. This study showed the refractory nature of SUC, and SUC led to the transmission of extracellular ARGs in partial nitrification system with TCS pre-exposure, exacerbating the risk of ARGs dissemination.
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Affiliation(s)
- Liqin Zeng
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Jingfeng Gao
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China.
| | - Yingchao Cui
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Zhiqi Wang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Yifan Zhao
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Yukun Yuan
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Hongxin Xu
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
| | - Xiaoyu Fu
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Faculty of Environment and Life, Beijing University of Technology, Beijing 100124, China
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3
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Lin B, Tan B, Zhang Q, Li M, Peng H, Su J, He J, Zhang Y, Liu X, Wu N. Unraveling the nexus of Cr (Ⅵ), Aniline, and Microbial Ecology on aniline-degrading biosystem: Removal efficiency, sludge type, microbial ecology. BIORESOURCE TECHNOLOGY 2023; 382:129185. [PMID: 37196741 DOI: 10.1016/j.biortech.2023.129185] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2023] [Revised: 05/10/2023] [Accepted: 05/14/2023] [Indexed: 05/19/2023]
Abstract
In order to explore the stress principle of Cr (Ⅵ) on aniline biodegradation system, a control group and experimental groups with the concentration of Cr (Ⅵ) at 2, 5, 8 mg/L were set up. The results demonstrated that Cr (Ⅵ) had minimal effects on the degradation efficiency of aniline but significantly inhibited nitrogen removal function. When Cr (Ⅵ) concentration was below 5 mg/L, the nitrification performance recovered spontaneously, while denitrification performance was severely impaired. Furthermore, the secretion of extracellular polymeric substances (EPS) and its fluorescence substance concentration were strongly inhibited with increasing Cr (Ⅵ) concentration. High-throughput sequencing revealed that the experimental groups were enriched with Leucobacter and Cr (Ⅵ)-reducing bacteria, but the abundance of nitrifiers and denitrifiers was significantly decreased compared to the control group. Overall, the effects of Cr (Ⅵ) stress at different concentrations on nitrogen removal performance were more significant than those on aniline degradation.
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Affiliation(s)
- Bing Lin
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, P.R. China
| | - Bin Tan
- CCCC Second Highway Consultants Co., Ltd, Wuhan, 430056, P.R. China
| | - Qian Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, P.R. China; Sanya Science and Education Innovation Park, Wuhan University of Technology, Hainan 572024, P.R. China.
| | - Meng Li
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, P.R. China; Sanya Science and Education Innovation Park, Wuhan University of Technology, Hainan 572024, P.R. China
| | - Haojin Peng
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai, 200092, China
| | - Junhao Su
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, P.R. China
| | - Jing He
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, P.R. China
| | - Yunjie Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, P.R. China
| | - Xiangyu Liu
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, P.R. China
| | - Nanping Wu
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, P.R. China
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4
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Yin Y, Zhang Q, Peng H. Retrospect and prospect of aerobic biodegradation of aniline: Overcome existing bottlenecks and follow future trends. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 330:117133. [PMID: 36584469 DOI: 10.1016/j.jenvman.2022.117133] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2022] [Revised: 12/17/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
Aniline is a highly bio-toxic industrial product, even at low concentrations, whose related wastewater has been flowing out worldwide on a large scale along with human production. As a green technology, aerobic biological treatment has been widely applied in industrial wastewater and exhibited various characteristics in the field of aniline wastewater. Meanwhile, this technology has shown its potential of synchronous nitrogen removal, but it still consumes energy badly. In the face of resource scarcity, this review comprehensively discusses the existing research in aerobic biodegradation of aniline wastewater to find out the developmental dawn of aerobic biological treatment. Primarily, it put forward the evolution history details of aniline biodegradation from pure culture to mixed culture and then to simultaneous nitrogen removal. On this basis, it presented the existing challenges to further expand the application of aerobic biotechnology, including the confusions of aniline metabolic mechanism, the development of co-degradation of multiple pollutants and the lack of practical experience of bioreactor operation for aniline and nitrogen removal. Additionally, the prospects of the technological shift to meet the needs of an energy-conserving society was described according to existing experiences and feasibility. Including but not limiting to the development of multifunctional bacteria, the reduction of greenhouse gases and the combination of green technologies.
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Affiliation(s)
- Yixin Yin
- School of Resources & Environmental Engineering, Wuhan University of Technology, Wuhan, Hubei, 430070, China
| | - Qian Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan, 430070, China.
| | - Haojin Peng
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
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5
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Intermolecular degradation of aromatic compound and its derivatives via combined sequential and hybridized process. Bioprocess Biosyst Eng 2023; 46:359-371. [PMID: 35796867 DOI: 10.1007/s00449-022-02743-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2022] [Accepted: 06/06/2022] [Indexed: 11/02/2022]
Abstract
The under-treated wastewater, especially remaining carcinogenic aromatic compounds in wastewater discharge has been expansively reported, wherein the efficiency of conventional wastewater treatment is identified as the primary contributor source. Herein, the advancement of wastewater treatments has drawn much attention in recent years. In the current study, combined sequential and hybridized treatment of thermolysis and coagulation-flocculation provides a novel advancement for environmental emerging pollutant (EP) prescription. This research is mainly demonstrating the mitigation efficiency and degradation pathway of pararosaniline (PRA) hybridized and combined sequential wastewater treatment. Notably, PRA degradation dominantly via a linkage of reaction: thermal cleavage, deamination, silication and diazene reduction. Thermolysis acts as an initiator for the PRA decomposition through thermally induced bond dissociation energy (BDE) for molecular fragmentation whilst coagulation-flocculation facilitates the formation of organo-bridged silsesquioxane as the final degradation product. Different from conventional treatment, the hybridized treatment showed excellent synergistic degradability by removing 99% PRA and its EPs, followed by combined sequential treatment method with 86% reduction. Comprehensive degradation pathway breakdown of carcinogenic and hardly degradable aromatic compounds provides a new insight for wastewater treatment whereby aniline and benzene are entirely undetectable in effluent. The degradation intermediates, reaction derivatives and end products were affirmed by gas chromatography-mass spectrometry, Fourier transform infrared spectroscopy and ultraviolet-visible spectrophotometry (GC-MS, FTIR and UV-Vis). This finding provides valuable guidance in establishing efficient integrated multiple-step wastewater treatments.
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6
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Zhang Y, Zhang Q, Peng H, Zhang W, Li M, Feng J, He J, Su J. The changing C/N of aggressive aniline: Metagenomic analysis of pollutant removal, metabolic pathways and functional genes. CHEMOSPHERE 2022; 309:136598. [PMID: 36174730 DOI: 10.1016/j.chemosphere.2022.136598] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Revised: 08/06/2022] [Accepted: 09/21/2022] [Indexed: 06/16/2023]
Abstract
In order to optimize the degradation of high-concentration aniline wastewater, the operation of sequencing batch bioaugmentation reactors with different aniline concentrations (200 mg/L, 600 mg/L, 1000 mg/L) was studied. The results showed that the removal rates of aniline and COD in the three reactors could reach 100%. When the aniline increased to 600 mg/L, the nitrogen removal efficiency reached the peak (51.85%). The increase of aniline inhibited the nitrification, while denitrification was enhanced due to the increase of C/N ratio. But this change was reversed by the toxicity of high concentrations of aniline. The metagenomic analysis showed that when the aniline concentration was 600 mg/L, the abundance distribution of microbial samples was more uniform. The improved of aniline concentration had led to the increase of aromatic compounds degradation metabolic pathways. In addition, the abundance of aniline degradation and nitrogen metabolism genes (dmpB, xylE, norB) was also promoted.
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Affiliation(s)
- Yunjie Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Qian Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China.
| | - Haojin Peng
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Wenli Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Meng Li
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Jiapeng Feng
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Jing He
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Junhao Su
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
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7
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He J, Zhang Q, Tan B, Guo N, Peng H, Feng J, Su J, Zhang Y. Understanding the effect of residual aluminum salt coagulant on activated sludge in sequencing batch reactor: Performance response, activity restoration and microbial community evolution. ENVIRONMENTAL RESEARCH 2022; 212:113449. [PMID: 35561832 DOI: 10.1016/j.envres.2022.113449] [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: 02/02/2022] [Revised: 04/07/2022] [Accepted: 05/05/2022] [Indexed: 06/15/2023]
Abstract
To investigate the effect of residual coagulant after coagulation pretreatment on activated sludge system of wastewater treatment plants (WWTPs), comparative evaluation of lab-scale sequencing batch reactors under different poly-aluminum chloride (PAC) concentrations (20 and 55 mg/L), presenting the performance differences of reactors. Results showed that the PAC concentration of 20 mg/L slightly enhanced the average removal efficiencies of chemical oxygen demand (COD) and total nitrogen (TN), up to 93.43% and 72.52%. Whereas, an inhibition effect was exerted at the PAC concentration of 55 mg/L, the average removal efficiencies decreased to 88.56% and 57.80% respectively. Similarly, the residual aluminum salts showed a concentration effect of low promotion and high inhibition on sludge activity index. The content of specific oxygen utilization rate (SOUR) and dehydrogenase (DHA) sharply decreased by 30.17% and 53.56% under the high PAC concentration of 55 mg/L. Activity recovery phase showed that the suppression of aluminum salt coagulant on biological system was reversible. High-throughput sequencing presented that the relative abundance of microbes showed obvious variations at different PAC concentrations, and certain bacteria in Chloroflexi and Bacteroidota exhibited better adaptability to the high PAC concentration environment. Nevertheless, the antagonism action between denitrifying genera and other genera as well as the downregulation of functional enzymes regarding nitrogen metabolism gave rise to the deterioration of denitrification under the high PAC concentration of 55 mg/L. This study revealed the influence mechanism of residual aluminum salt coagulant on activated sludge system, providing strategies for efficient decontamination and long-term stable operation of biological system in wastewater treatment plant under the condition of adding PAC.
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Affiliation(s)
- Jing He
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Qian Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan, 430070, PR China.
| | - Bin Tan
- Wuhan Branch, Chengdu JiZhun FangZhong Architectural Design, Wuhan, 40061, PR China
| | - Nuowei Guo
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Haojin Peng
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Jiapeng Feng
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Junhao Su
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
| | - Yunjie Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan, 430070, PR China
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8
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Chen X, Yuan C, Zhu Y, Liu H, Chen W, Zhang Q. Bioaugmentation with Acinetobacter sp. TAC-1 to enhance nitrogen removal in swine wastewater by moving bed biofilm reactor inoculated with bacteria. BIORESOURCE TECHNOLOGY 2022; 359:127506. [PMID: 35750120 DOI: 10.1016/j.biortech.2022.127506] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2022] [Revised: 06/15/2022] [Accepted: 06/20/2022] [Indexed: 06/15/2023]
Abstract
To enhance the performance of moving bed biofilm reactor (MBBR) inoculated with heterotrophic nitrification-aerobic denitrification (HN-AD) bacteria, bioaugmentation with Acinetobacter sp. TAC-1 was firstly employed and then the treatment performance for real swine wastewater was presented in this study. Results indicated that NH4+-N and TN removal rates of bioaugmented reactor were significantly improved from 16.53 mg/L/h and 16.15 mg/L/h to 24.58 mg/L/h and 24.45 mg/L/h, respectively. The efficient removal performance (NH4+-N 95.01%, TN 86.40%) for real swine wastewater was achieved within 24 h. Microbial analysis indicated that the composition of functional bacteria varied with the introduction of Acinetobacter sp. TAC-1, especially the abundance of Acinetobacter, Paracoccus and Rhodococcus related to the nitrogen removal. Furthermore, bioaugmentation with Acinetobacter sp. TAC-1 increased abundance of enzymes and functional genes (nirS, nirK and norZ) corresponding to denitrification that may be responsible for the enhanced nitrogen removal performance.
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Affiliation(s)
- Xue Chen
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 40054, China
| | - Chunbo Yuan
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 40054, China
| | - Yunan Zhu
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 40054, China
| | - Huan Liu
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 40054, China
| | - Wang Chen
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 40054, China
| | - Qian Zhang
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 40054, China.
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9
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Ren LF, Chen K, Zhang X, Xu Y, Chen L, Shao J, He Y. Effect of aniline and antimony on anaerobic-anoxic-oxic system with novel amidoxime-modified polyacrylonitrile adsorbent for wastewater treatment. BIORESOURCE TECHNOLOGY 2022; 351:127082. [PMID: 35358677 DOI: 10.1016/j.biortech.2022.127082] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 03/24/2022] [Accepted: 03/25/2022] [Indexed: 06/14/2023]
Abstract
There has been increasing concern over the mixed discharge of municipal-textile composite wastewater, which remains challenging for typical wastewater treatment plant (WWTP) using anaerobic-anoxic-oxic process (AAO). Highly-toxic aniline and antimony, typical co-contaminants in textile wastewater, usually lead to increased chemical oxygen demand (COD) in influent and deteriorated effluent quality. Amidoxime-modified polyacrylonitrile (amPAN) adsorbent was prepared and added to adsorb antimony and facilitate substrate removal. With amPAN dosage at 6.0 g L-1 in oxic bioreactor, 64.2 ± 5.6% of antimony was removed from influent. Extracellular polymeric substance release was simultaneously changed with residual antimony concentration. Meanwhile, amPAN promoted the proliferation of Proteobacteria, Bacteroidetes and Epsilonbacteraeota serving as microorganism carrier. As a result, removal efficiencies of COD (94.4 ± 0.6%), ammonium (NH4+-N, 92.6 ± 3.3%), total nitrogen (TN, 76.4 ± 6.3%) and total phosphorus (TP, 93.4 ± 2.1%) were enhanced to meet Class 1A discharge standard in China. These results indicate that AAO with amPAN is promising for municipal-textile composite wastewater treatment.
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Affiliation(s)
- Long-Fei Ren
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, PR China; Chongqing Research Institute, Shanghai Jiao Tong University, No. 598 Liangjiang Road, Chongqing 401135, PR China
| | - Kai Chen
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, PR China
| | - Xiaofan Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, PR China
| | - Yubo Xu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, PR China
| | - Lei Chen
- National Engineering Research Center of Urban Water Resources, No. 230 Xuchang Road, Shanghai 200082, PR China
| | - Jiahui Shao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, PR China.
| | - Yiliang He
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, No. 800 Dongchuan Road, Shanghai 200240, PR China
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10
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Li L, Guo R, Zhang S, Yuan Y. Sustainable and effective degradation of aniline by sodium percarbonate activated with UV in aqueous solution: Kinetics, mechanism and identification of reactive species. ENVIRONMENTAL RESEARCH 2022; 207:112176. [PMID: 34637757 DOI: 10.1016/j.envres.2021.112176] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/24/2021] [Revised: 09/26/2021] [Accepted: 10/02/2021] [Indexed: 06/13/2023]
Abstract
In recent decades, sodium percarbonate (SPC) has been widely applied as a solid replacement for H2O2 in advanced oxidation process (AOPs). In this study, ultraviolet (UV) light was utilized for SPC activation to investigate the aniline degradation performance. The effects of SPC dosages and UV irradiation on aniline degradation were elaborated. The removal efficiency was significantly improved by increasing either the SPC dosage or UV irradiation intensity. Moreover, scavenging experiments showed that •OH, CO3•-, and O2•- were the predominant reactive species for aniline degradation. Meanwhile, the variation in the amount of •OH in the UV/SPC system was monitored, which revealed the dominant role of •OH. As a result, the mechanism of aniline degradation by the UV/SPC system was demonstrated based on confirmed free radicals. Furthermore, aniline degradation by the UV/H2O2 and UV/H2O2/Na2CO3 system were compared with the UV/SPC system, and an enhancement by the addition of Fe(II) in the UV/SPC system was verified. Aniline degradation was not significantly affected by the initial pH or the presence of Cl-, SO42- while NO3-, HCO3- and humid acid (HA) suppressed the reaction. In general, the UV/SPC system is a novel, green, and promising technology for aniline removal from aqueous solutions.
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Affiliation(s)
- Li Li
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China
| | - Ruoning Guo
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China
| | - Sai Zhang
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, PR China.
| | - Yiming Yuan
- School of Water Conservancy Engineering, Zhengzhou University, Zhengzhou, 450001, PR China
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11
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Changes in Wastewater Treatment Performance and the Microbial Community during the Bioaugmentation of a Denitrifying Pseudomonas Strain in the Low Carbon–Nitrogen Ratio Sequencing Batch Reactor. WATER 2022. [DOI: 10.3390/w14040540] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The low carbon–nitrogen ratio (C/N) of influent wastewater results in the insufficient carbon source for the process of denitrification in urban wastewater treatment plants (WWTPs). A denitrifying bacterial strain, Pseudomonas sp. JMSTP, was isolated and demonstrated effective denitrification ability under a low C/N ratio of 1.5–4 (w/w) in anoxic conditions. Sequencing batch reactor (SBR) studies were conducted to test the bioaugmentation of JMSTP on total nitrogen (TN) removal under the influent COD/N ratio of 3/1. After the second bioaugmentation, the TN of effluent in the bioaugmented SBR was significantly lower than that in the control SBR. Redundancy analysis results showed that there was a positive correlation between Pseudomonas sp. abundance and TN removal in the bioaugmented SBR. Microbial community analysis showed that, especially after the second bioaugmentation, the abundance of Pseudomonas sp. decreased rapidly, but it was still much higher than that in the control SBR. Correlation network analysis showed that after the addition, Pseudomonas sp. had no significant co-occurrence relationship with other native bacteria, owing to the quick increase and decrease. Our results suggest that JMSTP shows the potential to enhance TN removal through bioaugmentation. Since the effect of bioaugmentation gradually diminishes, further research is still needed to investigate its long-lasting applications.
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12
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Application of a Partial Nitrogen Lab-Scale Sequencing Batch Reactor for the Treatment of Organic Wastewater and Its N2O Production Pathways, and the Microbial Mechanism. SUSTAINABILITY 2022. [DOI: 10.3390/su14031457] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Partial nitrification (PN) is a widely used wastewater treatment process. Here a lab-scale sequencing batch reactor for PN (PN-SBR) was constructed and run with artificial organic wastewater for 225 days. Results showed that the SBR reached a stable PN state after 174 days of operation and >98% of NH4+-N was removed and >60% was converted to NO2−-N with low effluent NO3−-N content. In a PN-SBR cycle at stage IV, the release of N2O was accompanied by the production of hydroxylamine, occurring mainly in the conversion from anaerobic to aerobic phases, and the amount of N2O produced was about 6.3% of the total nitrogen. The N2O isotopic signature results suggested that hydroxylamine oxidation was the main pathway for N2O production. Illumina MiSeq sequencing results showed that Proteobacteria and Bacteroidetes were the dominant phyla throughout the operation period. Many heterotrophic nitrifiers were significantly enriched, leading to ammonia removal and nitrite accumulation, including Acidovorax, Paracoccus, Propionibacteriaceae_unclassified, Shinella, Comamonas and Brevundimonas. Representative strains were isolated from the reactor and they were capable of efficiently producing nitrite from ammonia. These results provide a guide for the direct running of PN reactors for treating organic wastewater and help to understand the microbial processes and N2O release pathways and the microbial mechanism of partial nitrification.
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Peng H, Zhang Y, Zhang Q, Zhang W, Li M, Feng J, Su J, He J, Zhong M. Control of aeration time in the aniline degrading-bioreactor with the analysis of metagenomic: Aniline degradation and nitrogen metabolism. BIORESOURCE TECHNOLOGY 2022; 344:126281. [PMID: 34752880 DOI: 10.1016/j.biortech.2021.126281] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Revised: 10/29/2021] [Accepted: 10/30/2021] [Indexed: 06/13/2023]
Abstract
The strategy of adjusting aeration time (5 h/6 h/7 h) was applied to the sequential batch reactors to optimize the treatment of aniline wastewater (600 mg/L) conveniently and economically. Three reactors degraded aniline effectively. The nitrogen removal ability of system with 6 h aeration time was better, performing the similar denitrification property as 5 h and nitrification performance as 7 h. Meanwhile, longer aeration time potentially damaged the sludge structure. The metagenomic analysis explained the micro-mechanism for the better performance of the system with 6 h aeration time. Appropriate aeration time was conducive to the enrichment of synergistic microflora, including aniline degrading-bacteria, heterotrophic nitrifiers and denitrifiers. Then, the tilt of environmental resources to these floras in the system was beneficial to the maximum value utilization of living substrates. Accordingly, these bacteria were more closely related to genes, resulting in higher expression of functional genes in the system.
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Affiliation(s)
- Haojin Peng
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Yunjie Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Qian Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China.
| | - Wenli Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Meng Li
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Jiapeng Feng
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Junhao Su
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Jing He
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Min Zhong
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
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Peng H, Zhang Q, Tan B, Li M, Feng J, Zhang Y, He J, Su J, Zhong M. Understanding the impacts of operation mode sequences on the biological aniline degradation system: Startup phase, pollutants removal rules and microbial response. BIORESOURCE TECHNOLOGY 2021; 340:125758. [PMID: 34426246 DOI: 10.1016/j.biortech.2021.125758] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2021] [Revised: 08/07/2021] [Accepted: 08/09/2021] [Indexed: 06/13/2023]
Abstract
Comparative evaluation of SBRs under different modes (AX/O, AN/AX/O, AN/O/AX, O/AX) with same aniline wastewater arrangements, presenting the startup and performance differences of reactors. The results revealed that the four systems realized the efficient aniline and NH4+-N removal on the basis of sufficient aerobic time. Anaerobic aniline degradation was also achieved in the first three reactors after acclimation. The denitrification efficiency was the highest in O/AX reactor and the lowest in AN/O/AX due to mode sequence setup. Pollutants variations in the typical cycles experimental data combined with microbial diversity analysis were highlighted that aerobic denitrification contributed the most under O/AX mode, while the other three modes relied on anoxic denitrification. Meanwhile, low nitrifiers and aerobic denitrifiers abundance might be another reason for the poor denitrification of AN/O/AX mode. It was inferred that denitrification was most susceptible to operation mode sequences.
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Affiliation(s)
- Haojin Peng
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Qian Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China.
| | - Bin Tan
- Wuhan Branch, Chengdu JiZhun FangZhong Architectural Design, Wuhan 40061, PR China
| | - Meng Li
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Jiapeng Feng
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Yunjie Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Jing He
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Junhao Su
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Min Zhong
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, PR China
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15
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Li J, Wang Y, Xie H, Zhao W, Zhang L, Li J. Enhanced refractory organics removal by sponge iron-coupled microbe technology: performance and underlying mechanism analysis. Bioprocess Biosyst Eng 2021; 45:117-130. [PMID: 34617132 DOI: 10.1007/s00449-021-02645-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Accepted: 09/23/2021] [Indexed: 10/20/2022]
Abstract
Sponge iron (SFe) is a zero-valent iron (Fe0) composite with a high-purity and porous structure. In this study, SFe was coupled with microorganisms that were gradually domesticated to form a Fe0/iron-oxidizing bacteria system (Fe0-FeOB system). The enhancement effect of the Fe0-FeOB system on refractory organics was verified, the mechanism of its strengthening action was investigated, and the relationship and influencing factors between the Fe0 and microorganisms were revealed. The average removal rates of the Fe0-FeOB system were 8.98%, 5.69%, and 40.67% higher than those of the SBR system for AF, AN, and NB wastewater treatment, respectively. With the addition of SFe, the microbial community structure was gradually enhanced with a large number of FeOB were detected. Moreover, the bacteria with strong iron corrosion and Fe(II) oxidation abilities plays a critical role in improving the Fenton-like effect. Interestingly, the variation trend of ⋅OH was fairly consistent with that of Fe(II). Thus, the main drivers of the Fenton-like effect are biological corrosion and metabolism. Consequently, microbial degradation and Fenton-like effect contributed to the degradation performance of the Fe0-FeOB system. Among them, the microbial degradation accounted for 96.09%, of which the biogenic Fenton effect accounted for 8.9%, and the microbial metabolic activity accounted for 87.19%. However, the augmentation of the Fe0-FeOB system was strongly dependent on SFe for the strengthening effect of microorganisms disappeared after leaving the SFe 35 days.
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Affiliation(s)
- Jie Li
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Anning District, Lanzhou, 730070, Gansu, People's Republic of China.
| | - Yae Wang
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Anning District, Lanzhou, 730070, Gansu, People's Republic of China
| | - Huina Xie
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Anning District, Lanzhou, 730070, Gansu, People's Republic of China
| | - Wei Zhao
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Anning District, Lanzhou, 730070, Gansu, People's Republic of China
| | - Lihong Zhang
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Anning District, Lanzhou, 730070, Gansu, People's Republic of China.,Gansu Membrane Science and Technology Research Institute Co., Ltd., Lanzhou, 730020, People's Republic of China
| | - Jing Li
- School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, 88 Anning West Road, Anning District, Lanzhou, 730070, Gansu, People's Republic of China
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16
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Atasoy M, Cetecioglu Z. Bioaugmented Mixed Culture by Clostridium aceticum to Manipulate Volatile Fatty Acids Composition From the Fermentation of Cheese Production Wastewater. Front Microbiol 2021; 12:658494. [PMID: 34539589 PMCID: PMC8446653 DOI: 10.3389/fmicb.2021.658494] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2021] [Accepted: 06/30/2021] [Indexed: 11/13/2022] Open
Abstract
Production of targeted volatile fatty acid (VFA) composition by fermentation is a promising approach for upstream and post-stream VFA applications. In the current study, the bioaugmented mixed microbial culture by Clostridium aceticum was used to produce an acetic acid dominant VFA mixture. For this purpose, anaerobic sequencing batch reactors (bioaugmented and control) were operated under pH 10 and fed by cheese processing wastewater. The efficiency and stability of the bioaugmentation strategy were monitored using the production and composition of VFA, the quantity of C. aceticum (by qPCR), and bacterial community profile (16S rRNA Illumina Sequencing). The bioaugmented mixed culture significantly increased acetic acid concentration in the VFA mixture (from 1170 ± 18 to 122 ± 9 mgCOD/L) compared to the control reactor. Furthermore, the total VFA production (from 1254 ± 11 to 5493 ± 36 mgCOD/L) was also enhanced. Nevertheless, the bioaugmentation could not shift the propionic acid dominancy in the VFA mixture. The most significant effect of bioaugmentation on the bacterial community profile was seen in the relative abundance of the Thermoanaerobacterales Family III. Incertae sedis, its relative abundance increased simultaneously with the gene copy number of C. aceticum during bioaugmentation. These results suggest that there might be a syntropy between species of Thermoanaerobacterales Family III. Incertae sedis and C. aceticum. The cycle analysis showed that 6 h (instead of 24 h) was adequate retention time to achieve the same acetic acid and total VFA production efficiency. Biobased acetic acid production is widely applicable and economically competitive with petroleum-based production, and this study has the potential to enable a new approach as produced acetic acid dominant VFA can replace external carbon sources for different processes (such as denitrification) in WWTPs. In this way, the higher treatment efficiency for WWTPs can be obtained by recovered substrate from the waste streams that promote a circular economy approach.
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Affiliation(s)
- Merve Atasoy
- Department of Chemical Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
| | - Zeynep Cetecioglu
- Department of Chemical Engineering, KTH Royal Institute of Technology, Stockholm, Sweden
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Chen X, Zhang Q, Zhu Y, Zhao T. Response of wastewater treatment performance, microbial composition and functional genes to different C/N ratios and carrier types in MBBR inoculated with heterotrophic nitrification-aerobic denitrification bacteria. BIORESOURCE TECHNOLOGY 2021; 336:125339. [PMID: 34082332 DOI: 10.1016/j.biortech.2021.125339] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/23/2021] [Accepted: 05/25/2021] [Indexed: 06/12/2023]
Abstract
To operate the moving bed biofilm reactor inoculated with HN-AD bacteria (B-MBBR) instead of activated sludge for livestock and poultry breeding wastewater (LPBW) disposal in most efficient manner, nitrogen removal (NR) efficiency and microbial composition of two MBBRs with different carrier types under various C/N ratios were explored. Results indicated that the performance on NR greatly various in different carrier types under various C/N ratios. Attributing to the bacterial protection provided by the porous structure of polyvinyl alcohol (PVA) gel, MBBR using PVA gel as the carrier exhibited a more stable NR performance (range from 78.05% to 83.76%) versus that using Kaldnes (K1) as the carrier (range from 78.05% to 83.76%). Besides, microbial analysis indicated that MBBR with PVA gel as the carrier is conducive to the growth of oligotrophic and HN-AD bacteria (Paracoccus and Acinetobacter), and the highest relative abundance was 16.37% at C/N ratio of 6.
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Affiliation(s)
- Xue Chen
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 40054, China
| | - Qian Zhang
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 40054, China.
| | - Yunan Zhu
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 40054, China
| | - Tiantao Zhao
- School of Chemistry and Chemical Engineering, Chongqing University of Technology, Chongqing 40054, China
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18
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Fan Y, Chen X, Yao Z, Li H, Wang D, Tian M, Xu Z, Wan J. A novel inhibition mechanism of aniline on nitrification: Aniline degradation competes dissolved oxygen with nitrification. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 770:145205. [PMID: 33515876 DOI: 10.1016/j.scitotenv.2021.145205] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2020] [Revised: 01/12/2021] [Accepted: 01/12/2021] [Indexed: 06/12/2023]
Abstract
Aniline is a toxic aromatic amine and an inhibitor of nitrification. This study explored the inhibition effect and underlying mechanism. After sludge acclimation, 540 mg/L aniline was removed in 24 h and almost all ammonia released from aniline was oxidized to nitrate. However, nitrification never started until no aniline left. The cellular adenosine triphosphate (cATP) concentration of acclimated sludge reduced only by 2% after aniline exposure. Neither transmembrane transport of ammonia nor ammonia monooxygenase (AMO) activity was affected by aniline. Growing initial aniline concentration did not deteriorate the specific nitrification rate (NR). These all revealed that the toxicity of aniline only play a minor role in inhibition. Competition for dissolved oxygen (DO) was proposed to be another possible inhibition mechanism. The oxygen affinity constant (Ks) of aniline degraders and ammonia-oxidizing bacteria (AOB) was calculated to be 0.894 mg/L and 1.274 mg/L respectively, suggesting the former possessed much stronger oxygen affinity (P < 0.01). With aniline and ammonium as initial substrates, increasing aeration intensity advanced nitrification and increased the NR. Max NR of 0.63 mgN/(gMLSS·h) was achieved at the highest aeration intensity of 1000 mL/min. This study brings one step closer to better removal of aniline and derived nitrogen pollutants.
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Affiliation(s)
- Yanyan Fan
- College of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China; ZhiHe Environmental Science and Technology Co., Ltd., Zhengzhou 450001, China
| | - Xiaolei Chen
- ZhiHe Environmental Science and Technology Co., Ltd., Zhengzhou 450001, China
| | - Zhangyi Yao
- ZhiHe Environmental Science and Technology Co., Ltd., Zhengzhou 450001, China
| | - Haisong Li
- College of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China.
| | - Dandan Wang
- College of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China; ZhiHe Environmental Science and Technology Co., Ltd., Zhengzhou 450001, China
| | - Minhui Tian
- College of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China; ZhiHe Environmental Science and Technology Co., Ltd., Zhengzhou 450001, China
| | - Zicong Xu
- College of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China; ZhiHe Environmental Science and Technology Co., Ltd., Zhengzhou 450001, China
| | - Junfeng Wan
- College of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
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19
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Xie HN, Li J, Wang YE, Zhao W, Zhang LH, Li J. Influencing factors for the Fenton-like of biological sponge iron system and its degradation mechanism of aniline. Process Biochem 2021. [DOI: 10.1016/j.procbio.2020.11.012] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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20
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Zhao ZQ, Wei XM, Shen XL, Abbas G, Fan R, Jin Y. Aerobic degradation of 4-fluoroaniline and 2,4-difluoroaniline: performance and microbial community in response to the inocula. Biodegradation 2021; 32:53-71. [PMID: 33428058 DOI: 10.1007/s10532-021-09925-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2020] [Accepted: 01/02/2021] [Indexed: 11/27/2022]
Abstract
In this study, a distinct inoculum was investigated as an isolated variable within sequencing batch reactors via a comparison of the 4-fluoroaniline (4-FA) or 2,4-difluoroaniline (2,4-DFA) removal amounts. The inocula were derived from a treatment plant for treating pharmaceutical wastewater plus a small amount of municipal sewage (PMS), a treatment plant for treating fluoridated hydrocarbon wastewater (FHS), and a treatment plant for treating the comprehensive wastewater in an industrial park (CIS). There were slight differences among the degradation patterns of the 4-FA for the three inocula, whether during the enrichment period or the high concentration shock period. In contrast, it was observed that the degradation efficiency of 2,4-DFA initially varied with the inocula. The FHS-derived inoculum was determined to be optimal, exhibiting the earliest degradation reaction only after an acclimation of 7 days had the highest degradation rate constant of 0.519 h-1, and had the fastest recovery time of three weeks after high concentration shock. Additionally, compared with the PMS-derived inoculum, the CIS-derived inoculum exhibited an earlier degradation reaction within three weeks, and a higher microbial diversity, but a lower shock resistance and degradation rate constant of 0.257 h-1. High-throughput sequencing demonstrated that each final consortium was different in composition, and the microbial consortia developed well on the inoculum and substrate. In comparison of the similarity among the three 2,4-DFA enrichment cultures, the higher similarity (63.9-70.0%) among three final consortia enriching with 4-FA was observed. The results indicated that the inoculum played an important role in the degradation of FAs and the microbial bacterial communities of final consortia, and the effect extent might well depend on the fluorinated level of FAs.
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Affiliation(s)
- Zhi-Qing Zhao
- College of Chemical & Material Engineering, Quzhou University, Quzhou, 324000, People's Republic of China. .,College of Environment & Resource Sciences, Zhejiang University, Hangzhou, People's Republic of China.
| | - Xiao-Meng Wei
- Key Laboratory of Agro-Ecological Processes in Subtropical Region & Changsha Research Station for Agricultural and Environmental Monitoring, Institute of Subtropical Agriculture, Chinese Academy of Sciences, Hunan, 410125, China
| | - Xiao-Li Shen
- College of Chemical & Material Engineering, Quzhou University, Quzhou, 324000, People's Republic of China
| | - Ghulam Abbas
- Department of Chemical Engineering, University of Gujrat, Gujrat, 50700, Pakistan
| | - Rui Fan
- College of Chemical & Material Engineering, Quzhou University, Quzhou, 324000, People's Republic of China
| | - Yi Jin
- College of Chemical & Material Engineering, Quzhou University, Quzhou, 324000, People's Republic of China
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21
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Zhang W, Zhang Q, Li M, Wang H, Li Y, Peng H, Feng J. Microbial community and function evaluation in the start-up period of bioaugmented SBR fed with aniline wastewater. BIORESOURCE TECHNOLOGY 2021; 319:124148. [PMID: 32987279 DOI: 10.1016/j.biortech.2020.124148] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 09/13/2020] [Accepted: 09/16/2020] [Indexed: 06/11/2023]
Abstract
An enhanced sequencing batch reactor (SBR) system was developed to treat synthetic wastewater rich in 600 mg/L aniline. The aniline degradation efficiency was almost 100%, and the total nitrogen (TN) removal rate was more than 50%. Metagenomics technology revealed the community structure, functional genes and metabolic mechanism during the start-up of the enhanced reactor. Sequencing results showed that Proteobacteria, Bacteroidetes, Chloroflexi and Actinobacteria were dominant phylum. The proportion of degradation of aromatic compounds function increased gradually, but the proportion of nitrogen metabolism function changed little. Functional genes involved in aniline degradation including benA-xylX and dmpB/xylE were detected. The functional genes of nitrogen metabolism were involved in complete nitrification, traditional denitrification, assimilation nitrate reduction and dissimilation nitrate reduction. The functional contribution analysis and network analysis showed that the cooperation and competition of Thauera, Delftia, Diaphorobacter, Micavibrio and Azoarcus ensured the effective removal of aniline and nitrogen.
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Affiliation(s)
- Wenli Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Qian Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China.
| | - Meng Li
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Hongyu Wang
- School of Civil Engineering, Wuhan University, Wuhan 430072, PR China
| | - Yao Li
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Haojin Peng
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China
| | - Jiapeng Feng
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, PR China
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Zhang Q, Zhang W, He Q, Li M, Li Y, Huang W. Effects of dissolved oxygen concentrations on a bioaugmented sequencing batch rector treating aniline-laden wastewater: Reactor performance, microbial dynamics and functional genes. BIORESOURCE TECHNOLOGY 2020; 313:123598. [PMID: 32512429 DOI: 10.1016/j.biortech.2020.123598] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Revised: 05/25/2020] [Accepted: 05/26/2020] [Indexed: 06/11/2023]
Abstract
This work compared the efficiencies and internal reasons for aniline removal in a bioaugmented sequencing batch reactor at elevated dissolved oxygen (DO) concentrations. Nearly complete aniline removal was achieved while medium DO of 2.65 mg/L was optimal for subsequent nitrogen removal via heterotrophic nitrification-aerobic denitrification. Apart from the highest bacterial diversity richness, favorable DO condition largely enriched putatively aniline degrader, nitrifiers and denitrifiers. Further evidence from qPCR confirmed that moderate DO significantly stimulated the functional genes including aniline degrading gene tad, nitrifying genes amoA, hao, and denitrifying genes nirS and napA, respectively. This study indicates that the significant enrichment of key microorganisms and effective functional genes under optimal DO is the inner mechanism for reliable aniline degradation and subsequent nitrogen removal in the activated sludge reactor.
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Affiliation(s)
- Qian Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Wenli Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Qiulai He
- Key Laboratory of Building Safety and Energy Efficiency, Ministry of Education, Department of Water Engineering and Science, College of Civil Engineering, Hunan University, Changsha 410082, China.
| | - Meng Li
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Yao Li
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China
| | - Wansong Huang
- Hubei Jianke International Construction Co., Ltd., Wuhan 430070, China
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Abstract
Halophytes have been studied as a model for morphological traits of adaptation to saline environments. However, little information has been given on plant growth, chlorophyll fluorescence responses, and change of ion content in halophytes grown in an aniline–salinity coexistent environment. This study hypothesized that aniline could induce alterations in plant growth, chlorophyll fluorescence, and ion content in Suaeda salsa, but salinity could promote the tolerance of halophytes to aniline. A 6 (aniline) × 3 (NaCl) factorial experiment (for a total of 18 treatments) was conducted to test the above hypothesis. After 30 d of cultivation, roots and shoots were harvested separately to analyze the effects of salinity on the seedling growth under aniline stress. Biomass accumulation was inhibited by aniline treatment, and the inhibition was significantly alleviated by 200 mM NaCl. The change in chlorophyll fluorescence in leaves with aniline stress was moderated by the addition of NaCl. The removal efficiency of aniline was significantly enhanced by moderate salinity. Aniline stress decreased the accumulation of Mg2+, but various concentrations of NaCl increased the accumulation of Mg2+, especially with 200 mM NaCl in both roots and shoots. Both aniline and salinity decreased the content of Ca2+. There was a negative correlation between the K+ and NaCl concentrations and between the Cl− and aniline concentrations. Our results indicated that Suaeda salsa may be suitable for the remediation of salinity and aniline-enriched wastewater.
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Li L, Liang M, Huang J, Zhang S, Liu Y, Li F. Fe and Cu co-doped graphitic carbon nitride as an eco-friendly photo-assisted catalyst for aniline degradation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:29391-29407. [PMID: 32440869 DOI: 10.1007/s11356-020-08148-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 02/19/2020] [Indexed: 05/25/2023]
Abstract
A novel bimetallic coordinated g-C3N4 with Fe2O3 composite catalyst (FeCu-g-C3N4) was synthesized by simple calcination of Fe3+/Cu2+/melamine precursor. Its catalytic performance was analyzed via photodegrading aniline. The X-ray diffraction (XRD), field emission scanning electronic microscopy (FESEM), Fourier transform infrared (FT-IR), and X-ray photoelectron spectroscopy (XPS) were employed to characterize the composition and structure of the catalysts. Results indicated that Fe mainly distributed in the Fe(III)-N coordination form and partly in Fe2O3 lattice, and Cu inserted at the interstitial positions of g-C3N4 in the Cu(I)-N form. The great optical property was also proved by ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), photoluminescence (PL) spectroscopy, and photocurrent responses. The heterogeneous photo-assisted catalyst exhibited excellent performance in activation of H2O2, resulting in 80% decomposition of aniline with low metal leaching in 6 h. The incorporation of Cu elevated the performance of degradation compared to that only iron doped. A synergistic catalytic effect between solid Cu(I) and Fe(III) accelerated the reduction of Fe(III). The ·OH and 1O2 were confirmed as major reactive oxygen species (ROS) identified by scavenging experiments and ESR, and e- was the most essential since it not only led to the generation of ROS but also participated in the circulation of Fe3+/Fe2+, Cu2+/Cu+, and Fe3+/Cu+. Furthermore, the possible catalytic mechanism was proposed based on the analysis.
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Affiliation(s)
- Li Li
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, China.
| | - Ming Liang
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, China
| | - Jun Huang
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, China
| | - Sai Zhang
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, China
| | - Yuan Liu
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, China
| | - Fangyun Li
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region, Ministry of Education, College of Environment and Ecology, Chongqing University, Chongqing, 400045, China
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