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Cheng Q, Tian H, Zuo Y, Nengzi L, Du E, Peng M, Cheng X. Influence of temperature on performance and mechanism of advanced synergistic nitrogen removal in lab-scale denitrifying filter with biogenic manganese oxides. CHEMOSPHERE 2024; 359:142269. [PMID: 38719129 DOI: 10.1016/j.chemosphere.2024.142269] [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: 01/18/2024] [Revised: 04/06/2024] [Accepted: 05/05/2024] [Indexed: 06/05/2024]
Abstract
Temperature is a significant operational parameter of denitrifying filter (DF), which affects the microbial activity and the pollutants removal efficiency. This study investigated the influence of temperature on performance of advanced synergistic nitrogen removal (ASNR) of partial-denitrification anammox (PDA) and denitrification, consuming the hydrolytic and oxidation products of refractory organics in the actual secondary effluent (SE) as carbon source. When the test water temperature (TWT) was around 25, 20, 15 and 10 °C, the filtered effluent total nitrogen (TN) was 1.47, 1.70, 2.79 and 5.52 mg/L with the removal rate of 93.38%, 92.25%, 87.33% and 74.87%, and the effluent CODcr was 8.12, 8.45, 10.86 and 12.29 mg/L with the removal rate of 72.41%, 66.17%, 57.35% and 51.87%, respectively. The contribution rate of PDA to TN removal was 60.44%∼66.48%, and 0.77-0.96 mg chemical oxygen demand (CODcr) was actually consumed to remove 1 mg TN. The identified functional bacteria, such as anammox bacteria, manganese oxidizing bacteria (MnOB), hydrolytic bacteria and denitrifying bacteria, demonstrated that TN was removed by the ASNR, and the variation of the functional bacteria along the DF layer revealed the mechanism of the TWT affecting the efficiency of the ASNR. This technique presented a strong adaptability to the variation of the TWT, therefore, it has broad application prospect and superlative application value in advanced nitrogen removal of municipal wastewater.
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Affiliation(s)
- Qingfeng Cheng
- School of Urban Construction, Changzhou University, Changzhou, 213164, China
| | - Hui Tian
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu, 610225, China
| | - Yanting Zuo
- School of Urban Construction, Changzhou University, Changzhou, 213164, China
| | - Lichao Nengzi
- Academy of Environmental and Economics Sciences, Xichang University, Xichang, 615000, China
| | - Erdeng Du
- School of Urban Construction, Changzhou University, Changzhou, 213164, China
| | - Mingguo Peng
- School of Urban Construction, Changzhou University, Changzhou, 213164, China
| | - Xiuwen Cheng
- College of Earth and Environmental Sciences, Lanzhou University, Lanzhou, 730000, China.
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2
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Song J, Ma S, Huang Y, Lu K, Zhang J, Li Q. Mechanism of additional carrier with seasonal temperature changes enhanced ecological floating beds for non-point source pollution water treatment. ENVIRONMENTAL RESEARCH 2024; 242:117778. [PMID: 38036207 DOI: 10.1016/j.envres.2023.117778] [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: 08/02/2023] [Revised: 11/01/2023] [Accepted: 11/13/2023] [Indexed: 12/02/2023]
Abstract
The continuous performance and denitrification characteristics of carriers were investigated in two modified enhanced ecological floating beds (EFBs), one with only ceramsite and the other with ceramsite and extra additional stereo-elastic packing. Over a period of more than 414 days, the extra carrier was found to improve nitrogen removal while enhancing the system's resistance to seasonal temperature variations. The denitrification of all carriers in EFBs was inhibited in practice by seasonal temperature change, especially temperature rose from below 20 °C to above 20 °C and the inhibition rate of nitrous nitrogen (NO2--N) reduction was consistently above 91%, which was higher than that of nitrate nitrogen (NO3--N). However, the denitrification process including the rate and the resistance to temperature changes of ceramsite in the same EFBs with stereo-elastic packing at different temperatures, was consistently improved. The removal rate of NO3--N and NO2--N increased by up to 23.5% and 19.5%, respectively. The potential denitrification rates of all carriers increased with time which was also evidenced by in PICRUSt results, which showed that the abundances of predicted functional genes encoding NO3--N and NO2--N reductase increased over time. The dominant denitrifier also differed over time due to seasonal temperature changes.
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Affiliation(s)
- Jia Song
- College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou, 450002, China; School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an, 710055, China
| | - Shuanglong Ma
- College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou, 450002, China
| | - Yan Huang
- College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou, 450002, China
| | - Kaige Lu
- College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou, 450002, China
| | - Jingjing Zhang
- College of Resources and Environmental Sciences, Henan Agricultural University, Zhengzhou, 450002, China.
| | - Qian Li
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, No. 13 Yanta Road, Xi'an, 710055, China.
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3
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Zhang Y, Bao J, Du J, Mao Q, Cheng B. Comprehensive metagenomic and enzyme activity analysis reveals the inhibitory effects and potential toxic mechanism of tetracycline on denitrification in groundwater. WATER RESEARCH 2023; 247:120803. [PMID: 37922638 DOI: 10.1016/j.watres.2023.120803] [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: 07/22/2023] [Revised: 09/28/2023] [Accepted: 10/27/2023] [Indexed: 11/07/2023]
Abstract
The widespread use of tetracycline (TC) inevitably leads to its increasing emission into groundwater. However, the potential risks of TC to denitrification in groundwater remain unclear. In this study, the effects of TC on denitrification in groundwater were systematically investigated at both the protein and gene levels from the electron behavior aspect for the first time. The results showed that increasing TC from 0 to 10 µg·L-1 decreased the nitrate removal rate from 0.41 to 0.26 mg·L-1·h-1 while enhancing the residual nitrite concentration from 0.52 mg·L-1 to 50.60 mg·L-1 at the end of the experiment. From a macroscopic view, 10 µg·L-1 TC significantly inhibited microbial growth and altered microbial community structure and function in groundwater, which induced the degeneration of denitrification. From the electron behavior aspect (the electron production, electron transport and electron consumption processes), 10 µg·L-1 TC decreased the concentration of electron donors (nicotinamide adenine dinucleotide, NADH), electron transport system activity, and denitrifying enzyme activities at the protein level. At the gene level, 10 µg·L-1 TC restricted the replication of genes related to carbon metabolism, the electron transport system and denitrification. Moreover, discrepant inhibitory effects of TC on individual denitrification steps, which led to the accumulation of nitrite, were observed in this study. These results provide the information that is necessary for evaluating the potential environmental risk of antibiotics on groundwater denitrification and bring more attention to their effects on geochemical nitrogen cycles.
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Affiliation(s)
- Yi Zhang
- School of Environment Studies, China University of Geosciences, Wuhan 430074, PR China
| | - Jianguo Bao
- School of Environment Studies, China University of Geosciences, Wuhan 430074, PR China.
| | - Jiangkun Du
- School of Environment Studies, China University of Geosciences, Wuhan 430074, PR China
| | - Qidi Mao
- School of Environment Studies, China University of Geosciences, Wuhan 430074, PR China
| | - Benai Cheng
- School of Environment Studies, China University of Geosciences, Wuhan 430074, PR China
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4
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Wu G, Yang G, Sun X, Li B, Tian Z, Niu X, Cheng J, Feng L. Simultaneous denitrification and organics removal by denitrifying bacteria inoculum in a multistage biofilm process for treating desulfuration and denitration wastewater. BIORESOURCE TECHNOLOGY 2023; 388:129757. [PMID: 37714492 DOI: 10.1016/j.biortech.2023.129757] [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: 07/22/2023] [Revised: 09/04/2023] [Accepted: 09/07/2023] [Indexed: 09/17/2023]
Abstract
This study aimed to treat real wastewater from the desulfuration and denitration process in a petrochemical plant with high-strength nitrogen (TN≈200 mg/L, > 90% nitrate), sulfate (2.7%) and extremely low-strength organics (CODCr < 30 mg/L). Heterotrophic denitrification of multistage anoxic and oxic biofilm (MAOB) process in three tanks using facultative denitrifying bacteria inoculum was developed to simultaneously achieve desirable effluent nitrogen and organics at different hydraulic retention time (HRT) and carbon to nitrogen (C/N) mass ratios. The optimum condition was recommended as a C/N ratio of 1.5 and a HRT of A (24 h)/O (12-24 h) to achieve > 90% of nitrogen and organics removal as well as no significant variation of sulfate. The denitrifying biofilm in various tanks was dominant by Hyphomicrobium (8.9%-25.7%), Methylophaga (18.6%-25.8%) and Azoarcus (3.3%-19.6%), etc., containing > 20% aerobic denitrifiers. This explained that oxic zone in MAOB process also exhibited simultaneous nitrogen and organics removal.
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Affiliation(s)
- Guiyang Wu
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China
| | - Guangfeng Yang
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China; National-Local Joint Engineering Laboratory of Harbor Oil & Gas Storage and Transportation Technology, Zhoushan 316022, China
| | - Xiaoran Sun
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China
| | - Bu Li
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Zhijuan Tian
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Xinzheng Niu
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Junmei Cheng
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Lijuan Feng
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China; National-Local Joint Engineering Laboratory of Harbor Oil & Gas Storage and Transportation Technology, Zhoushan 316022, China.
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Wang Y, Sun Z, Qiang Z. Start-up of solid-phase denitrification process for treatment of nitrate-rich water in recirculating mariculture system: Carbon source selection and nitrate removal mechanism. CHEMOSPHERE 2023; 338:139568. [PMID: 37479001 DOI: 10.1016/j.chemosphere.2023.139568] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2023] [Revised: 06/24/2023] [Accepted: 07/17/2023] [Indexed: 07/23/2023]
Abstract
Efficient nitrate removal from recirculating mariculture system (RMS) water is of significance since high concentration of nitrate would cause chronic health effects on aquatic organisms and eutrophication. Solid-phase denitrification (SPD) is a safer and more sustainable approach than conventional heterotrophic denitrification by dosing liquid carbon sources. Thus, its application for treating nitrate-rich RMS water was investigated in this study. Poly 3-hydroxybutyrate-co-3-hydroxyvalerate (PHBV) was identified with the best nitrate removal among four kinds of carbon sources. PHBV-filled reactors started with mariculture, municipal and mixing sludges (at the ratio of 1:1) and fed with 200 mg L-1 nitrate-rich RMS water all achieved over 81% nitrate removals with a HRT of 4 days. The dissolved organic carbon concentrations of the reactors were in the range of 3-9 mg L-1. Arcobacter, Halomonas, and Psedomonas were dominant genera responsible for nitrate removal in different reactors. Metagenomic analyses indicate that both denitrification and assimilatory nitrate reduction (ANR) are the main contributors to nitrate removals. Metagenomic results illustrated nirB/D cooperated with nasA may perform ANR pathway, which transformed nitrate to ammonia for biosynthesis. These results indicate that SPD could be a safer alternative for treating nitrate-rich RMS water, and provide new insights into nitrogen metabolism pathways in SPD process.
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Affiliation(s)
- Yinghan Wang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhe Sun
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
| | - Zhimin Qiang
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China; University of Chinese Academy of Sciences, Beijing, 100049, China
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Cheng Q, Tian H, Guo X, Feng S, Du E, Peng M, Zhang J. Advanced synergetic nitrogen removal of municipal wastewater using oxidation products of refractory organic matters in secondary effluent by biogenic manganese oxides as carbon source. WATER RESEARCH 2023; 241:120163. [PMID: 37276654 DOI: 10.1016/j.watres.2023.120163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 04/17/2023] [Accepted: 05/31/2023] [Indexed: 06/07/2023]
Abstract
Due to the high operational cost and secondary pollution of the conventional advanced nitrogen removal of municipal wastewater, a novel concept and technique of advanced synergetic nitrogen removal of partial-denitrification anammox and denitrification was proposed, which used the oxidation products of refractory organic matters in the secondary effluent of municipal wastewater treatment plant (MWWTP) by biogenic manganese oxides (BMOs) as carbon source. When the influent NH4+-N in the denitrifying filter was about 1.0, 2.0, 3.0, 4.0, 5.0 and 7.0 mg/L, total nitrogen (TN) in the effluent decreased from about 22 mg/L to 11.00, 7.85, 6.85, 5.20, 4.15 and 2.09 mg/L, and the corresponding removal rate was 49.15, 64.82, 69.40, 76.70, 81.36 and 90.58%, respectively. The proportional contribution of the partial-denitrification anammox pathway to the TN removal was 12.00, 26.45, 39.70, 46.04, 54.97 and 64.01%, and the actual CODcr consumption of removing 1 mg TN was 0.75, 1.43, 1.26, 1.17, 1.08 and 0.99 mg, respectively, which was much lower than the theoretical CODcr consumption of denitrification. Furthermore, CODcr in the effluent decreased to 8.12 mg/L with a removal rate of 72.40%, and the removed organic matters were mainly non-fluorescent organic matters. Kinds of denitrifying bacteria, anammox bacteria, hydrolytic bacteria and manganese oxidizing bacteria (MnOB) were identified in the denitrifying filter, which demonstrated that the advanced synergetic nitrogen removal was achieved. This novel technology presented the advantages of high efficiency of TN and CODcr removal, low operational cost and no secondary pollution.
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Affiliation(s)
- Qingfeng Cheng
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China.
| | - Hui Tian
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China
| | - Xujing Guo
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China.
| | - Shanshan Feng
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China
| | - Erdeng Du
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China
| | - Mingguo Peng
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China
| | - Jie Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China
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7
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Cheng Q, Liu Z, Huang Y, Feng S, Du E, Peng M, Zhang J. Advanced nitrogen removal performance and microbial community structure of a lab-scale denitrifying filter with in-situ formation of biogenic manganese oxides. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 331:117299. [PMID: 36642053 DOI: 10.1016/j.jenvman.2023.117299] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 01/08/2023] [Accepted: 01/11/2023] [Indexed: 06/17/2023]
Abstract
Advanced nitrogen removal faces the challenges of high operational cost resulted from the additional carbon source and secondary pollution caused by inaccurate carbon source dosage in municipal wastewater. To address these problems, a novel carbon source was developed, which was the oxidation products of refractory organic matters in the secondary effluent of municipal wastewater treatment plant (MWWTP) by in-situ generated biogenic manganese oxides (BMOs) in the denitrifying filter. In the steady phase, the effluent chemical oxygen demand (CODcr), NO3--N and total nitrogen (TN) in the denitrifying filter 2# with BMOs was 11.27, 9.03 and 10.36 mg/L, and the corresponding removal efficiency was 54.79%, 51.85% and 48.03%, respectively, which was significantly higher than those in the control denitrifying filter 1# that the removal efficiency of CODcr, NO3--N and TN was only 32.30%, 28.58% and 29.36%, respectively. Kinds of denitrifying bacteria (Candidatus Competibacter, Defluviicoccus, Dechloromonas, Candidatus Competibacter, Dechloromonas, Pseudomonas, Thauera, Acinetobacter, Denitratisoma, Anaerolineae and Denitratisoma) and anammox bacteria (Pirellula, Gemmata, Anammoximicrobium and Brocadia) were identified in the denitrifying filters 1# and 2#, which explained why the actual CODcr consumption (1.55 and 1.44 mg) of reducing 1 mg NO3--N was much lower than the theoretical CODcr consumption. While manganese oxidizing bacteria (MnOB, Bacillus, Crenothrix and Pedomicrobium) was only identified in the denitrifying filter 2#. This novel technology presented the advantages of no additional carbon source, low operational cost and no secondary pollution. Therefore, the novel technology has superlative application value and broad application prospect.
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Affiliation(s)
- Qingfeng Cheng
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China; College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China.
| | - Zongyang Liu
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China
| | - Yang Huang
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China
| | - Shanshan Feng
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China
| | - Erdeng Du
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China
| | - Mingguo Peng
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China
| | - Jie Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China
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Wang F, Liu W, Liu W, Xiao L, Ai S, Sun X, Bian D. Simultaneous removal of organic matter and nitrogen by heterotrophic nitrification-aerobic denitrification bacteria in an air-lift multi-stage circulating integrated bioreactor. BIORESOURCE TECHNOLOGY 2022; 363:127888. [PMID: 36070812 DOI: 10.1016/j.biortech.2022.127888] [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: 07/24/2022] [Revised: 08/27/2022] [Accepted: 08/29/2022] [Indexed: 06/15/2023]
Abstract
This study aimed to propose a novel air-lift multi-stage circulating integrated bioreactor (AMCIB) to treat urban sewage. The AMCIB combined the reaction zone and sedimentation zone, the alternating circulation of activated sludge in separate aerobic and anaerobic environments facilitates the enrichment of HN-AD bacteria. The preliminary study showed that AMCIB had high removal efficiencies for COD, NH4+-N, TN and TP under high dissolved oxygen (DO) concentration conditions, with average removal rates of 93.21 %, 96.04 %, 75.06 % and 94.30 %, respectively. IlluminaMiSeq sequencing results showed that the system successfully cultured heterotrophic nitrification-aerobic denitrification (HN-AD) functional bacteria (Pseudomonas, Acinetobacter, Aeromonas) that played a crucial role in sewage treatment, and Tetrasphaera was the central phosphorus removing bacteria in the system. Functional gene predictions showed that the HN-AD played a dominant role in the system.
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Affiliation(s)
- Fan Wang
- Key Laboratory of Urban Sewage Treatment of Jilin Province, Changchun Institute of Technology, Changchun 130012, China
| | - Wanqi Liu
- Key Laboratory of Urban Sewage Treatment of Jilin Province, Changchun Institute of Technology, Changchun 130012, China
| | - Wenai Liu
- Key Laboratory of Urban Sewage Treatment of Jilin Province, Changchun Institute of Technology, Changchun 130012, China
| | - Letian Xiao
- Key Laboratory of Urban Sewage Treatment of Jilin Province, Changchun Institute of Technology, Changchun 130012, China
| | - Shengshu Ai
- Key Laboratory of Urban Sewage Treatment of Jilin Province, Changchun Institute of Technology, Changchun 130012, China
| | - Xuejian Sun
- Science and Technology Innovation Center for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun 130117, China
| | - Dejun Bian
- Key Laboratory of Urban Sewage Treatment of Jilin Province, Changchun Institute of Technology, Changchun 130012, China; Science and Technology Innovation Center for Municipal Wastewater Treatment and Water Quality Protection, Northeast Normal University, Changchun 130117, China.
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Gu M, Wang Y, Wan D, Shi Y, He Q. Electrodialysis ion-exchange membrane bioreactor (EDIMB) to remove nitrate from water: Optimization of operating conditions and kinetics analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 839:156046. [PMID: 35597341 DOI: 10.1016/j.scitotenv.2022.156046] [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: 03/17/2022] [Revised: 05/13/2022] [Accepted: 05/14/2022] [Indexed: 06/15/2023]
Abstract
Nitrate pollution has become a worldwide problem. In this study, we remove nitrate from water by electrodialysis ion-exchange membrane bioreactor (EDIMB) and enabling simultaneous nitrate enrichment and denitrification. In this reactor, nitrate migrated from the water chamber to the biological chamber via electrodialysis and was degraded by microorganisms. The effects of voltage and biomass concentration on the reactor performance were examined, and the kinetics data of the water chamber and biological chamber were fitted. The experimental results showed that the migration of nitrate in the water chamber conformed to the first-order model, and the constructed zero-Michaelis-Menten model described changes in nitrate concentration in the biological chamber. Furthermore, when the inflow nitrate concentration was 40 mg N/L, 5 V was the best voltage, and 3.00 g VSS/L was the best biomass concentration. The nitrate removal rate in the water chamber was 98.94%, and there was no accumulation of nitrate or nitrite in the biological chamber. Compared with traditional ED processes, the nitrate removal efficiency was 8.86% higher, and the current efficiency was 22.14% higher. The total organic carbon (TOC) of the water chamber was only 1.43 mg C/L, which proves that the structure of the EDIMB confined the denitrifying bacteria and organic carbon donors in the biological chamber and avoided secondary pollution in the water chamber. Microbial community analysis showed that Thauera (66.06%) was the dominant bacterium in the EDIMB system, and Azoarcus (9.81%) was a minor denitrifying genus.
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Affiliation(s)
- Mengqi Gu
- College of Environmental Engineering, Henan University of Technology, Zhengzhou, Henan 450001, China
| | - Yanan Wang
- College of Environmental Engineering, Henan University of Technology, Zhengzhou, Henan 450001, China
| | - Dongjin Wan
- College of Environmental Engineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Henan International Joint Laboratory of Environmental Pollution, Remediation and Grain Quality Security, Zhengzhou, Henan 450001, China; Institute for Carbon Neutrality, Henan University of Technology, Zhengzhou, Henan 450001, China.
| | - Yahui Shi
- College of Environmental Engineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Henan International Joint Laboratory of Environmental Pollution, Remediation and Grain Quality Security, Zhengzhou, Henan 450001, China
| | - Qiaochong He
- College of Environmental Engineering, Henan University of Technology, Zhengzhou, Henan 450001, China; Henan International Joint Laboratory of Environmental Pollution, Remediation and Grain Quality Security, Zhengzhou, Henan 450001, China
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Zhang R, Xu X, Lyu Y, Zhou Y, Chen Q, Sun W. Impacts of engineered nanoparticles and antibiotics on denitrification: Element cycling functional genes and antibiotic resistance genes. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 241:113787. [PMID: 35738104 DOI: 10.1016/j.ecoenv.2022.113787] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/26/2022] [Revised: 06/14/2022] [Accepted: 06/16/2022] [Indexed: 06/15/2023]
Abstract
The wide presence of antibiotics and minerals warrants their combined effects on the denitrification in natural aquatic environment. Herein, we investigated the effects of two antibiotics, sulfamethazine (SMZ) and chlortetracycline (CTC), on the reduction of NO3--N and accumulation of NO2--N in the absence and presence of engineered nanoparticles (NPs) (Al2O3, SiO2, and geothite) using 16 S rRNA sequencing and high-throughput quantitative PCR. The results showed that the addition of antibiotics inhibited the reduction of NO3--N by changing the bacterial community structure and reducing the abundance of denitrification genes, while engineered NPs promoted the denitrification by increasing the abundance of denitrification genes. In the binary systems, engineered NPs alleviated the inhibitory effect of antibiotics through enriching the denitrification genes and adsorbing antibiotics. Antibiotics and its combination with engineered NPs changed the composition of functional genes related to C, N, P, S metabolisms (p < 0.01). The addition of antibiotics and/or engineered NPs altered the bacterial community structure, which is dominated by the genera of Enterobacter (40.7-90.5%), Bacillus (4.9-58.5%), and Pseudomonas (0.21-12.7%). The significant relationship between denitrification, carbon metabolism genes, and antibiotic resistance genes revealed that the heterotrophic denitrifying bacteria may host the antibiotic resistance genes and denitrification genes simultaneously. The findings underscore the significance of engineered NPs in the toxicity assessment of pollutants, and provide a more realistic insight into the toxicity of antibiotics in the natural aquatic environment.
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Affiliation(s)
- Ruijie Zhang
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Beijing 100871, China
| | - Xuming Xu
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Beijing 100871, China
| | - Yitao Lyu
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Beijing 100871, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Ying Zhou
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Beijing 100871, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Qian Chen
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Beijing 100871, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China
| | - Weiling Sun
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, Beijing 100871, China; The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
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11
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Zhang M, Han F, Chen H, Yao J, Li Q, Li Z, Zhou W. The effect of salinity on ammonium-assimilating biosystems in hypersaline wastewater treatment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 829:154622. [PMID: 35306073 DOI: 10.1016/j.scitotenv.2022.154622] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2022] [Revised: 03/12/2022] [Accepted: 03/12/2022] [Indexed: 06/14/2023]
Abstract
The ammonium-assimilating biosystem is a promising solution to improve the susceptible biological nitrogen removal (BNR) and to achieve nitrogen recovery in saline wastewater treatment. However, the treatment performance and functional stability of ammonium-assimilating biosystems have not been fully illuminated in hypersaline wastewater. In this study, although the dramatic decrease of removal efficiency of NH4+-N and PO43--P was observed in ammonium-assimilating biosystems under the salinity from 3% to 7%, the direction of nitrogen conversions through assimilation was insusceptible to high salinity. The extremely low concentrations of nitrite and nitrate accumulation and abundances of nitrification functional genes confirmed that the process of nitrification was negligible in all biosystems. Ammonium-assimilating biosystems maintained robustness and functional stability in hypersaline wastewater. The increase of salinity stimulated the production of EPS and changed the microbial community by enriching Proteobacteria and halophilic genera. We anticipate that the ammonium-assimilating biosystem could be a promising strategy for hypersaline wastewater treatment and future practical applications.
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Affiliation(s)
- Mengru Zhang
- School of Environmental Science and Engineering, Shandong University, 250100 Jinan, China
| | - Fei Han
- School of Environmental Science and Engineering, Shandong University, 250100 Jinan, China
| | - Hao Chen
- School of Environmental Science and Engineering, Shandong University, 250100 Jinan, China
| | - Jingye Yao
- School of Environmental Science and Engineering, Shandong University, 250100 Jinan, China
| | - Qinyang Li
- School of Environmental Science and Engineering, Shandong University, 250100 Jinan, China
| | - Zhe Li
- School of Civil Engineering, Shandong University, 250061 Jinan, China
| | - Weizhi Zhou
- School of Civil Engineering, Shandong University, 250061 Jinan, China.
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12
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Chen Y, Wang H, Gao X, Li X, Dong S, Zhou H, Tan Z. COD/TN ratios shift the microbial community assembly of a pilot-scale shortcut nitrification-denitrification process for biogas slurry treatment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:49335-49345. [PMID: 35220533 DOI: 10.1007/s11356-022-19285-w] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2021] [Accepted: 02/14/2022] [Indexed: 06/14/2023]
Abstract
In this study, effects of carbon to nitrogen (COD/TN) ratios of biogas slurry on shortcut nitrification-denitrification in a pilot-scale integrated fixed film activated sludge (IFAS) system were investigated. Lowering the COD/TN ratio from 11.7 to 6.2 exerted a negative impact on shortcut nitrification-denitrification performance. Accordingly, the NH3-N and TN removal rates decreased from 94.4 to 91.2% and 92.3 to 85.9%, respectively. The dynamics of microbial assembly was analyzed by MiSeq sequencing, and the denitrifying functional genes were quantified by qPCR. The results showed that ammonia oxidizing bacteria and amoA gene were more abundant on the biofilm of oxic tank, indicating they play a key role in NH3-N removal. Autotrophic, endogenous, and fast heterotrophic kinetics denitrifiers were coexisted and enriched in the IFAS system with a decreasing of COD/TN ratio. TN removal was mainly affected by denitrifiers (including Arenimonas, Acidovorax, and Thaurea) harboring narG and nirS genes. Canonical correspondence analysis proved that COD/TN ratio was the most critical factor driving the succession of microbial community. Dissolved oxygen (DO) and pH were found positively correlated with denitrifiers at low COD/TN ratio conditions. As a result, NH3-N and TN removal were effectively enhanced when the DO level in the oxic tank of IFAS system was increased to 1.0-3.0 mg/L.
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Affiliation(s)
- Yangwu Chen
- CAS Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Huan Wang
- School of Food and Biological Engineering, Chengdu University, Chengdu, 610106, China
| | - Xingdong Gao
- CAS Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Xin Li
- CAS Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Shiyang Dong
- CAS Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Houzhen Zhou
- CAS Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
- Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Zhouliang Tan
- CAS Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China.
- Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China.
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13
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Luo J, Miao S, Koju R, Joshi TP, Liu R, Liu H, Qu J. Simultaneous removal of aromatic pollutants and nitrate at high concentrations by hypersaline denitrification:Long-term continuous experiments investigation. WATER RESEARCH 2022; 216:118292. [PMID: 35421667 DOI: 10.1016/j.watres.2022.118292] [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: 12/28/2021] [Revised: 02/22/2022] [Accepted: 03/12/2022] [Indexed: 06/14/2023]
Abstract
If we can use toxic aromatic compounds as supplementary carbon source, the simultaneous removal of nitrate (NO3-) and aromatic compounds may be achieved at much lower chemical costs. This study uses the expanded granular sludge bed (EGSB) reactors to investigate the hypersaline (> 3%) denitrification performance, the removal of aromatic compounds, i.e., aniline, phenol, and their mixture, and the mechanisms involved in. The four reactors exhibit high removal efficiency of NO3- (> 92.8%) and aromatic compounds (> 73.9%) at 0-1200 mg/L of aromatic compounds. The formation of toxic intermediates such as catechol and azo dyes is revealed by gas chromatography mass spectrometry (GC-MS) with and without N,O-Bis(trimethylsilyl) trifluoroacetamide (BSTFA) derivation, and their toxic effects lead to the lower cell survival ratios after exposing to phenol (64.2% ∼ 68.9%) than to aniline and mixture (72.7% ∼ 78.0%). The stable performance is associated with the more secretion of extracellular polymeric substances (EPS) and the adsorption of pollutants on EPS, and this was indicated from the higher fluorescence intensity in three-dimensional excitation-emission matrix (3D-EEM). Moreover, the Halomonas and Azoarcus show high abundance and play important roles in the removal of both NO3- and aromatic compounds. Besides, quantitative real time PCR (RT-qPCR) results demonstrate the key role of highly abundant nosZ and nirS genes in denitrification. The toxic organics in industrial wastewaters are potentially feasible carbon sources for denitrification even under high-salinity stress.
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Affiliation(s)
- Jing Luo
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; College of Civil Engineering, Fuzhou University, Fuzhou, 350116, China
| | - Shiyu Miao
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Rashmi Koju
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Tista Prasai Joshi
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Environment and Climate Study Laboratory, Faculty of Science, Nepal Academy of Science and Technology, Khumaltar, Lalitpur, Nepal
| | - Ruiping Liu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China.
| | - Huijuan Liu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Jiuhui Qu
- Center for Water and Ecology, State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
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14
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Qu M, Liu Y, Hao M, Wang M, Chen R, Wang XC, Zheng Y, Dzakpasu M. Microbial community and carbon-nitrogen metabolism pathways in integrated vertical flow constructed wetlands treating wastewater containing antibiotics. BIORESOURCE TECHNOLOGY 2022; 354:127217. [PMID: 35470002 DOI: 10.1016/j.biortech.2022.127217] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 04/18/2022] [Accepted: 04/19/2022] [Indexed: 06/14/2023]
Abstract
This study demonstrates effects of sulfamethoxazole (SMX) on carbon-nitrogen transformation pathways and microbial community and metabolic function response mechanisms in constructed wetlands. Findings showed co-metabolism of SMX with organic pollutants resulted in high removal of 98.92 ± 0.25% at influent concentrations of 103.08 ± 13.70 μg/L (SMX) and 601.92 ± 22.69 mg/L (COD), and 2 d hydraulic retention. Microbial community, co-occurrence networks, and metabolic pathways analyses showed SMX promoted enrichment of COD and SMX co-metabolizing bacteria like Mycobacterium, Chryseobacterium and Comamonas. Relative abundances of co-metabolic pathways like Amino acid, carbohydrate, and Xenobiotics biodegradation and metabolism were elevated. SMX also increased relative abundances of the resistant heterotrophic nitrification-aerobic denitrification bacteria Paracoccus and Comamonas and functional genes nxrA, narI, norC and nosZ involved in simultaneous heterotrophic nitrification-aerobic denitrification. Consequently, denitrification rate increased by 1.30 mg/(L∙d). However, insufficient reaction substrate and accumulation of 15.29 ± 2.30 mg/L NO3--N exacerbate inhibitory effects of SMX on expression of some denitrification genes.
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Affiliation(s)
- Miaowen Qu
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Ying Liu
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Mengqing Hao
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Mengting Wang
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Rong Chen
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Xiaochang C Wang
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
| | - Yucong Zheng
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China.
| | - Mawuli Dzakpasu
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an 710055, PR China; International Science & Technology Cooperation Center for Urban Alternative Water Resources Development, Xi'an University of Architecture and Technology, Xi'an 710055, PR China
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15
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Yajun W, Chongchong G, Tianjing C, Jinshou L, Yan X, Dafang F. Adaptability of enhanced bioretention cell for nitrogen and phosphorus removal under two antibiotics stress. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 230:113114. [PMID: 35026675 DOI: 10.1016/j.ecoenv.2021.113114] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/07/2021] [Revised: 12/08/2021] [Accepted: 12/21/2021] [Indexed: 06/14/2023]
Abstract
The overuse of antibiotics in the medical and aquaculture industries has led to the frequent detection of antibiotics in wastewater. Considering antibiotics would have an unknown impact on wastewater treatment in the future, the long-term effects of sulfamethoxazole (SMX) and tetracycline (TC) stress on the performance, functional genes and microbial community in three bioretention cells were investigated. The results showed that during the experiment, 0.8-1.2 mg/L of SMX would not destroy the water treatment capacity of the bioretention cells, and had a promoting effect on total nitrogen and ammonia nitrogen. 1.6 mg/L of SMX would cause the reduction of nitrogen removal efficiency and the phenomenon of phosphorus release, but it could be restored after a period of operation. TC of 0.8-1.2 mg/L did not have a significant impact on the removal of nutrients in AC-BRC (activated carbon-bioretention cell) and ACI-BRC (activated carbon and iron-bioretention cell), but TC of 1.2 mg/L caused the phenomenon of phosphorus release in BRC and the decrease of total nitrogen removal rate, 1.6 mg/L TC could make the bioretention cell lose its water treatment capacity. qPCR analysis of denitrification genes showed that the abundance of nirS, nirK, nosZ, and hzo had varying degrees of decrease before and after antibiotic stress, which meant the two antibiotics significantly inhibited the reduction of nitrite and nitrous oxide. But for the total number of bacteria, the relative abundance of the four genes has increased. The results of microbial community analysis also found that Proteobacteria, Bacteroidetes, Chloroflexi, and BIrii41, Denitratisoma, Ferritrophicum, Thiobacillus occupied the dominant species at the phylum level and the genus level respectively, which included most of the denitrifying bacteria. During the experiment, the nitrogen and phosphorus removal efficiency of AC-BRC and ACI-BRC were enhanced obviously, but ammonia nitrogen accumulated in ACI-BRC in the early stage of the reaction.
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Affiliation(s)
- Wang Yajun
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China.
| | - Geng Chongchong
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China; Jiangsu Jurong Investment Group, Jurong 212400, China
| | - Chen Tianjing
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Li Jinshou
- School of Civil Engineering, Lanzhou University of Technology, Lanzhou 730050, China
| | - Xu Yan
- School of Civil Engineering, Southeast University, Nanjing 211189, China
| | - Fu Dafang
- School of Civil Engineering, Southeast University, Nanjing 211189, China
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16
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Zhang R, Xu X, Jia D, Lyu Y, Hu J, Chen Q, Sun W. Sediments alleviate the inhibition effects of antibiotics on denitrification: Functional gene, microbial community, and antibiotic resistance gene analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 804:150092. [PMID: 34520908 DOI: 10.1016/j.scitotenv.2021.150092] [Citation(s) in RCA: 25] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Revised: 08/28/2021] [Accepted: 08/29/2021] [Indexed: 06/13/2023]
Abstract
Both antibiotics and sediments can affect the denitrification in aquatic systems. However, little is known how antibiotics influence the denitrification in the presence of sediments. Here, the effects of antibiotics (sulfamethoxazole, tetracycline and ofloxacin) on denitrification in the absence and presence of sediments were investigated. The influencing mechanisms were revealed by quantifying the denitrification functional genes (DNGs), 16S-seq of bacteria, and antibiotic resistance genes (ARGs). The results showed that the presence of antibiotics inhibited NO3-N reduction by decreasing the abundances of narG, nirK, nosZ, total DNGs, and denitrifying bacteria. However, the inhibition effect was alleviated by sediments, which promoted the growth of bacteria and decreased the selective pressure of antibiotics as the vector of bacteria and antibiotics, thus increasing the abundances of denitrifying bacteria and all the DNGs. Partial least-squares path model disclosed that antibiotics had negative effects on bacteria, ARGs and DNGs, while sediments had negative effects on ARGs but positive effects on bacteria and DNGs. The network analysis further revealed the close relation of the genera Bacillus, Acinetobacter, and Enterobacter with the ARGs and DNGs. The findings are helpful to understand the denitrification in antibiotic-polluted natural waters.
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Affiliation(s)
- Ruijie Zhang
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China
| | - Xuming Xu
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China
| | - Dantong Jia
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China
| | - Yitao Lyu
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China
| | - Jingrun Hu
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China
| | - Qian Chen
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China
| | - Weiling Sun
- College of Environmental Sciences and Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China; State Environmental Protection Key Laboratory of All Material Fluxes in River Ecosystems, International Joint Laboratory for Regional Pollution Control, Ministry of Education, Beijing 100871, China.
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17
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OUP accepted manuscript. FEMS Microbiol Ecol 2022; 98:6521440. [DOI: 10.1093/femsec/fiac007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 01/30/2022] [Accepted: 02/01/2022] [Indexed: 11/13/2022] Open
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18
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Hu J, Yan J, Wu L, Bao Y, Yu D, Li J. Simultaneous nitrification and denitrification of hypersaline wastewater by a robust bacterium Halomonas salifodinae from a repeated-batch acclimation. BIORESOURCE TECHNOLOGY 2021; 341:125818. [PMID: 34455251 DOI: 10.1016/j.biortech.2021.125818] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 08/17/2021] [Accepted: 08/17/2021] [Indexed: 06/13/2023]
Abstract
Biotreatment of hypersaline wastewater requires robust strains with high resistance to activity inhibition and even bacterium death, which remains a worldwide challenge. Here Halomonas salifodinae, a simultaneous nitrification and denitrification (SND) bacterium, was isolated by performing repeated-batch acclimation, showing efficient nitrogen removal at 0-15% salinity and low activity inhibition prominently superior to that of other strains such as Pseudomonas sp. and Acinetobacter sp. Community analysis as well as comparison of microbial activity at different salinities revealed an increased relative abundance of halotolerant populations by stimulating their salt tolerance during the repeated-batch process. For single or mixed nitrogen sources at 15% salinity, the SND efficiencies of the isolated strain reached above 95%. The high activities were attributed to the key enzymes AMO and HAO for nitrification as well as NAP and NIR for denitrification. The findings provide a promising acclimation pathway to obtain robust bacteria for biotreatment of hypersaline wastewater.
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Affiliation(s)
- Jie Hu
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China
| | - Jiabao Yan
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China
| | - Ling Wu
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China
| | - Yanzhou Bao
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China
| | - Danqing Yu
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China
| | - Jing Li
- School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China; Hubei Province Key Laboratory of Coal Conversion and New Carbon Materials, Wuhan University of Science and Technology, Wuhan 430081, China.
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19
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Liu X, Hu S, Sun R, Wu Y, Qiao Z, Wang S, Zhang Z, Cui C. Dissolved oxygen disturbs nitrate transformation by modifying microbial community, co-occurrence networks, and functional genes during aerobic-anoxic transition. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 790:148245. [PMID: 34380284 DOI: 10.1016/j.scitotenv.2021.148245] [Citation(s) in RCA: 31] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2021] [Revised: 05/28/2021] [Accepted: 05/31/2021] [Indexed: 05/23/2023]
Abstract
No consensus has been achieved among researchers on the effect of dissolved oxygen (DO) on nitrate (NO3--N) transformation and the microbial community, especially during aerobic-anoxic transition. To supplement this knowledge, NO3--N transformation, microbial communities, co-occurrence networks, and functional genes were investigated during aerobic-anoxic transition via microcosm simulation. NO3--N transformation rate in the early stage (DO ≥2 mg/L) was always significantly higher than that in the later stage (DO <2 mg/L) during aerobic-anoxic transition, and NO2--N accumulation was more significant during the anoxic stage, consistent with the result obtained under constant DO conditions. These NO3--N transformation characteristics were not affected by other environmental factors, indicating the important role of DO in NO3--N transformation during aerobic-anoxic transition. Changes in DO provoked significant alterations in microbial diversity and abundance of functional bacteria dominated by Massilia, Bacillus, and Pseudomonas, leading to the variation in NO3--N transformation. Co-occurrence network analysis revealed that NO3--N transformation was performed by the interactions between functional bacteria including symbiotic and competitive relationship. In the presence of oxygen, these interactions accelerated the NO3--N transformation rate, and bacterial metabolization proceeded via increasingly varied pathways including aerobic and anoxic respiration, which was demonstrated through predicted genes. The higher relative abundance of genes narG, narH, and napA suggested the occurrence of coupled aerobic-anoxic denitrification in the early stage. NO3--N transformation rate decreased accompanied by a significant NO2--N accumulation with the weakening of coupled aerobic-anoxic denitrification during aerobic-anoxic transition. Structural equation modeling further demonstrated the relationship between DO and NO3--N transformation. DO affects NO3--N transformation by modifying microbial community, bacterial co-occurrence, and functional genes during aerobic-anoxic transition.
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Affiliation(s)
- Xiaoyan Liu
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China
| | - Sihai Hu
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China
| | - Ran Sun
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China
| | - Yaoguo Wu
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China.
| | - Zixia Qiao
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China
| | - Sichang Wang
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China
| | - Zehong Zhang
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China
| | - Chuwen Cui
- School of Chemistry and Chemical Engineering, Northwestern Polytechnical University, Xi'an 710129, China
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20
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Response of the reactor performances and bacterial communities to the evolution of sulfide-based mixotrophic denitrification processes from nitrate-type to nitrite-type. Biochem Eng J 2021. [DOI: 10.1016/j.bej.2021.108069] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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21
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Zerva I, Remmas N, Melidis P, Ntougias S. Biotreatment efficiency, hydrolytic potential and bacterial community dynamics in an immobilized cell bioreactor treating caper processing wastewater under highly saline conditions. BIORESOURCE TECHNOLOGY 2021; 325:124694. [PMID: 33454565 DOI: 10.1016/j.biortech.2021.124694] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2020] [Revised: 01/02/2021] [Accepted: 01/06/2021] [Indexed: 06/12/2023]
Abstract
Although caper processing wastewaters (CPW) are characterized by high organic content and salt concentration, no attempt has been made to treat these effluents. In this study, an immobilized cell bioreactor efficiently treated CPW even at hypersaline conditions (100 g/L salinity). Nitrogen was mainly assimilated during biotreatment, as nitrification was inhibited at elevated salinities. The hydrolytic potential was assessed by determining glucanase, xylanase, glucosidase, lipase and protease activities, which were negatively affected above 20 g/L salinity as the consequence of the inhibition of non-halotolerant microbiota. Succession of non-halotolerant taxa by the slightly halotolerant bacteria Defluviimonas, Amaricoccus, Arenibacter, Formosa and Muricauda, and then by the moderately/extremely halotolerant genera Halomonas, Roseovarius and Idiomarina occurred over salinity increase. Diversity indices were reduced during transition from moderately saline to hypersaline conditions. A distinct network was formed at hypersaline conditions, consisting of the halotolerant genera Halomonas, Idiomarina, Saliterribacillus and Gracilibacillus.
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Affiliation(s)
- Ioanna Zerva
- Laboratory of Wastewater Management and Treatment Technologies, Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67132 Xanthi, Greece
| | - Nikolaos Remmas
- Laboratory of Wastewater Management and Treatment Technologies, Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67132 Xanthi, Greece
| | - Paraschos Melidis
- Laboratory of Wastewater Management and Treatment Technologies, Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67132 Xanthi, Greece
| | - Spyridon Ntougias
- Laboratory of Wastewater Management and Treatment Technologies, Department of Environmental Engineering, Democritus University of Thrace, Vas. Sofias 12, 67132 Xanthi, Greece.
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