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Chang RR, Yao W, Pang JL, Dong KY, Lu YY, Huang BC, Jin RC. External redox couple enhanced anammox sludge activity at low temperature: Insight into intracellular resource synthesis. WATER RESEARCH 2024; 260:121904. [PMID: 38878317 DOI: 10.1016/j.watres.2024.121904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2024] [Revised: 05/28/2024] [Accepted: 06/06/2024] [Indexed: 07/27/2024]
Abstract
Anaerobic ammonium oxidation (anammox), an energy-efficient deamination biotechnology, faces operational challenges in low-temperature environments. Enhancing the metabolic activity of anammox bacteria (AnAOB) is pivotal for advancing its application in mainstream municipal wastewater treatment. Inspired by the metabolic adaptability of AnAOB and based on our previous findings, this work investigated the enhancement of intracellular ATP and NADH synthesis through the exogenous supply of reduced humic acid (HAred) and H2O2 redox couple, aiming to augment AnAOB activity under low-temperature conditions. Our experimental setup involved continuous dosing of 0.0067 μmol g-1 volatile suspended solid of H2O2 and 10 mg g-1 volatile suspended solid of HAred into a mainstream anammox reactor operated at 15 °C with an influent TN content of 60 mg/L. The results showed that HAred / H2O2 couple succeeded in maintaining the effluent TN at 10.72 ± 0.91 mg l-1. The specific anammox activity, ATP and NADH synthesis levels of sludge increased by 1.34, 2.33 and 6.50 folds, respectively, over the control setup devoid of the redox couple. High-throughput sequencing analysis revealed that the relative abundance of Candidatus Kuenenia after adding HAred / H2O2 couple reached 3.65 % at the end of operation, which was 5.14 folds higher than that of the control group. Further metabolomics analysis underscored an activation in the metabolism of amino acids, nucleotides, and phospholipids, which collectively enhanced the availability of ATP and NADH for the respiratory processes. These findings may provide guidance on strategy development for improving the electron transfer efficiency of AnAOB and underscore the potential of using redox couples to promote the mainstream application of anammox technology.
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Affiliation(s)
- Rong-Rong Chang
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Wei Yao
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Jin-Luo Pang
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Kai-Yue Dong
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Yao-Yao Lu
- School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Bao-Cheng Huang
- School of Engineering, Hangzhou Normal University, Hangzhou 311121, China.
| | - Ren-Cun Jin
- School of Engineering, Hangzhou Normal University, Hangzhou 311121, China
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Liu H, Dong W, Zhao Z, Wang H, Hou Z, Li Y, Zeng Z, Xie J, Wang F, Liu X, Yan Y, Qu Y. Advanced nitrogen removal from low carbon nitrogen ratio domestic sewage via continuous plug-flow anaerobic/oxic/anoxic system: Enhanced by endogenous denitrification. BIORESOURCE TECHNOLOGY 2023; 378:128987. [PMID: 37001701 DOI: 10.1016/j.biortech.2023.128987] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2023] [Revised: 03/25/2023] [Accepted: 03/28/2023] [Indexed: 06/19/2023]
Abstract
An anaerobic/oxic/anoxic continuous plug-flow biorereactor was established to derive stable advanced nitrogen removal of oligotrophic domestic wastewater by setting a sludge dual-reflux system and a mixed liquid cross-flow system, while extending the hydraulic retention time in anoxic section. The effluent total inorganic nitrogen was 7.9 ± 2.2 mg N/L, with removal efficiency of 84 ± 3.9%. Results of nitrogen balance calculations indicated that the contribution of simultaneous nitrification and denitrification to total inorganic nitrogen loss in oxic region was 15% during stable stage, and the total inorganic nitrogen removal by endogenous-denitrification and enhanced exogenous-denitrification in the anoxic region was 39.9%. Prolongation of hydraulic retention time in anoxic segment is the critical reason for enhancing endogenous-denitrification, and cross-flow system is an important measure to improve exogenous-denitrification. This study provides new insights into bridging the gap between energy-saving and high-level nitrogen removal from municipal wastewater with low carbon to nitrogen ratios.
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Affiliation(s)
- Huaguang Liu
- School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Wenyi Dong
- School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Zilong Zhao
- School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, China
| | - Hongjie Wang
- School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen, 518055, China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin, 150090, China.
| | - Zilong Hou
- School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Yanchen Li
- School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Zhiwei Zeng
- School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Jin Xie
- School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Fupeng Wang
- School of Civil and Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen 518055, China
| | - Xueyon Liu
- China Northeast Municipal Engineering Design & Research Institute Co. Ltd., Changchun 130021, China
| | - Yu Yan
- China Northeast Municipal Engineering Design & Research Institute Co. Ltd., Changchun 130021, China
| | - Yanhui Qu
- China Northeast Municipal Engineering Design & Research Institute Co. Ltd., Changchun 130021, China
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Xu L, Zhao J, Wang J, Gu R, Qu Y, Yin J, Yu D, Yu Z, Feng J, Wang X. Elucidating performance failure in the use of an Anaerobic-Oxic-Anoxic (AOA) plug-flow system for biological nutrient removal. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 880:163320. [PMID: 37028655 DOI: 10.1016/j.scitotenv.2023.163320] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/14/2023] [Revised: 03/30/2023] [Accepted: 04/02/2023] [Indexed: 04/14/2023]
Abstract
The Anaerobic-oxic-anoxic (AOA) process is a carbon-saving and high-efficiency way to treat municipal wastewater and gets more attention. Recent reports suggest that in the AOA process, well-performed endogenous denitrification (ED), conducted by glycogen accumulating organisms (GAOs), is crucial to advanced nutrient removal. However, the consensuses about starting up and optimizing AOA, and in-situ enriching GAOs, are still lacking. Hence, this study tried to verify whether AOA could be established in an ongoing anaerobic-oxic (AO) system. For this aim, a lab-scale plug-flow reactor (working volume of 40 L) previously operated under AO mode for 150 days, during that 97.87 % of ammonium was oxidized to nitrate and 44.4 % of orthophosphate was absorbed. Contrary to expectations, under AOA mode, little nitrate reduction (only 6.3 mg/L within 5.33 h) indicated the failure of ED. According to high-throughput sequencing analysis, GAOs (Candidatus_Competibacter and Defluviicoccus) were enriched within the AO period (14.27 % and 3 %) and then still dominated during the AOA period (13.9 % and 10.07 %) but contributed little to ED. Although apparent alternate orthophosphate variations existed in this reactor, no typical phosphorus accumulating organisms were abundant (< 2 %). More than that, within the long-term AOA operation (109 days), the nitrification weakened (merely 40.11 % of ammonium been oxidized) since the dual effects of low dissolved oxygen and long unaerated duration. This work reveals the necessity of developing practical strategies for starting and optimizing AOA, and then three aspects in future studying are pointed out.
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Affiliation(s)
- Lingna Xu
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Ji Zhao
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Jimiao Wang
- Qingdao Water Group Co. Ltd., Qingdao 266100, China
| | - Ruihuan Gu
- Qingdao Water Group Co. Ltd., Qingdao 266100, China
| | - Yong Qu
- Qingdao Shuangyuan Water Co. Ltd., Qingdao 266109, China
| | - Jianhui Yin
- Qingdao Shuangyuan Water Co. Ltd., Qingdao 266109, China
| | - Deshuang Yu
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Zhengda Yu
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Juan Feng
- Science and Technology Department, Qingdao University, Qingdao 266071, China.
| | - Xiaoxia Wang
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China.
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4
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Zhu W, Chen J, Zhang H, Yuan S, Guo W, Zhang Q, Zhang S. Start-up phase optimization of pyrite-intensified hybrid sequencing batch biofilm reactor (PIHSBBR): Mixotrophic denitrification performance and mechanism. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 330:117232. [PMID: 36610197 DOI: 10.1016/j.jenvman.2023.117232] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/06/2022] [Revised: 12/31/2022] [Accepted: 01/03/2023] [Indexed: 06/17/2023]
Abstract
Pyrite-based autotrophic denitrification (PAD) is an emerging biological process to diminish nitrate pollution, but the relatively low NO3--N removal rate limits its practical application. In this research, a pyrite-intensified hybrid sequencing batch biofilm reactor (PIHSBBR) was designed to treat low C/N ratio domestic wastewater. The results showed that PIHSBBR could achieve optimal removal of COD, NH4+-N, and TN under the aeration rate of 1.0 L/L∙min and the hydraulic retention time (HRT) of 8 h, with removal rates of 69.67 ± 4.37%, 77.04 ± 4.84%, and 63.92 ± 6.66%, respectively. The PAD efficiency in PIHSBBR during the stable operation was not high (13.05-31.01%), and the main nitrogen removal pathway in PIHSBBR, especially in the aerobic zone, was simultaneous nitrification and denitrification (SND). High-throughput sequencing analysis unraveled that Planctomycetota (3.65%) had a high abundance in the anoxic zone of PIHSBBR, implying that anaerobic ammonium oxidation (anammox) might have occurred in the anoxic zone. In addition, the nitrogen cycle function gene with the highest abundance was nirBD, indicating the possible presence of dissimilatory nitrate reduction to ammonium (DNRA) within the system (aerobic and anoxic zones). Our research can provide useful information for the improvement and future application of PIHSBBR.
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Affiliation(s)
- Wentao Zhu
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Jing Chen
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Hongjun Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Sicheng Yuan
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Weijie Guo
- Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Changjiang River Scientific Research Institute, Wuhan, 430010, China
| | - Qian Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China
| | - Shiyang Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan, 430070, China.
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Tang M, Guo Z, Xu X, Sun L, Wang X, Yang Y, Chen J. Performance and microbial mechanism of eletrotrophic bio-cathode denitrification under low temperature. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 328:116960. [PMID: 36493545 DOI: 10.1016/j.jenvman.2022.116960] [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: 10/05/2022] [Revised: 11/26/2022] [Accepted: 11/30/2022] [Indexed: 06/17/2023]
Abstract
Insufficient amount of carbon in wastewater and low temperatures hinder the use of biological nitrogen removal for purification of wastewaters. Nitrogen removal using cold-tolerant electrotrophic cathodic microbes is a novel and unique autotrophic denitrification technique in which electrical current, not chemicals, is used as a source of electrons. In this study, integrated MFC (RW) and open-circuit MFC (RO) were cultured and acclimatized in stages at a low temperature (10 °C) to impart cold tolerance to electrotrophic cathodic microbes, investigate the effectiveness of simultaneous nitrification and denitrification (SND) process, and address the possible mechanism of microbial action. The results showed that (i) microbial communities in the RW system were successfully enriched with the cold-tolerant electrotrophic cathodic microbes after five stages, and (ii) the degree of NH4+-N removal and SND were 75.50% and 81.91%, respectively, but the respective values in the RO system were only 40.47% and 54.01%. The desirable SND efficiency was obtained in RW at a DO of ∼0.6 mg/L, a current of ∼20 mA, and pH ∼7.0. In RW, Thauera, Pesudomonas, and Hydrogenophaga were the main electrotrophic cathodic denitrifying bacteria with cold tolerance capable of degrading ammonia, nitrate, and nitrite through autotrophic denitrification and cathodic-driven bio-electrochemical denitrification. Besides, for RW, results from high throughput sequencing analysis revealed that the abundance of genes related to energy production and conversion, amino acid transport, and metabolism, signal transduction, environmental adaptation, and enzymatic activity (AMO, HAO, NAR, NIR, NOR, and NOS) were significantly higher than the corresponding parameters of the RO system. This may explain the reason behind RW having excellent ammonia and TN removal performance at low temperatures.
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Affiliation(s)
- Meizhen Tang
- School of Life Sciences, Qufu Normal University, No.57 Jingxuan West Road, Qufu, 273165, PR China.
| | - Zhina Guo
- School of Life Sciences, Qufu Normal University, No.57 Jingxuan West Road, Qufu, 273165, PR China
| | - Xiaoyan Xu
- School of Life Sciences, Qufu Normal University, No.57 Jingxuan West Road, Qufu, 273165, PR China
| | - Lianglun Sun
- School of Life Sciences, Qufu Normal University, No.57 Jingxuan West Road, Qufu, 273165, PR China
| | - Xiaoning Wang
- Shandong Deli Environmental Protection Engineering Co. Ltd, PR China
| | - Yuewei Yang
- School of Life Sciences, Qufu Normal University, No.57 Jingxuan West Road, Qufu, 273165, PR China
| | - Junfeng Chen
- School of Life Sciences, Qufu Normal University, No.57 Jingxuan West Road, Qufu, 273165, PR China
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6
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Jia T, Zhang L, Li X, Zhao Q, Peng Y, Sui J, Wang C. Characteristics of biotrickling filter system for hydrogen sulfide removal with seasonal temperature variations: A strategy for low temperature conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 857:159617. [PMID: 36273568 DOI: 10.1016/j.scitotenv.2022.159617] [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: 08/21/2022] [Revised: 10/17/2022] [Accepted: 10/17/2022] [Indexed: 06/16/2023]
Abstract
The impact of temperature on the biological removal of hydrogen sulfide (H2S) from air is critical to its effective application in cold regions or seasons. This study investigated the effect of seasonal temperature variations (7-30 °C) on the H2S removal performance of a biotrickling filter system, with an effective H2S elimination capacity of 98.1 g/m3/h (removal efficiency = 83.1 %) achieved at temperatures of 10-12 °C. Biofilm growth was found to be accelerated by increased secretion of extracellular polymeric substances, enhanced biofilm adhesion capacity and relatively high levels of elemental sulfur accumulation, which help to retain heat within the filter bed under cold conditions. High-throughput sequencing showed that the psychrotolerant sulfur-oxidizing bacterium (SOB) Metallibacterium was gradually enriched (54.8 %) at temperatures below 15 °C. The major pathways of sulfur metabolism under low temperature conditions were determined based on the detection of enzymes related to sulfur metabolism. Finally, a strategy to enrich Metallibacterium was proposed to promote the application of biodesulfurization under low temperature conditions.
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Affiliation(s)
- Tipei Jia
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Liang Zhang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Xiyao Li
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Qi Zhao
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Yongzhen Peng
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
| | - Jun Sui
- Guangdong Shouhui Lantian Engineering and Technology Co. Ltd., Guangzhou 510075, PR China
| | - Chuanxin Wang
- Guangdong Shouhui Lantian Engineering and Technology Co. Ltd., Guangzhou 510075, PR China
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Yang S, Chang H, Peng Y, Zhang S, Han X, Sun S, Liu J, Zhang L. Advanced nutrient removal and external sludge reduction: Demonstration in a pilot-scale sequencing batch reactor. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2023; 95:e10837. [PMID: 36683357 DOI: 10.1002/wer.10837] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Revised: 12/29/2022] [Accepted: 01/07/2023] [Indexed: 06/17/2023]
Abstract
Although the addition of excess sludge fermentation products to improve nutrient removal from sewage is cost-effective, its application has rarely been demonstrated. In this study, the external sludge was first collected and fermented under a sludge retention time of 10 days, then introduced into SBR with a 1:15 sewage ratio. The results revealed a gradual increase in the nitrite accumulation ratio to 34.7% in the SBR at the end of the oxic stage after 64 days of adding fermented sludge products. In addition, the average effluent total nitrogen and phosphorous decreased to 7.3 and 0.5 mg/L, corresponding to removal efficiencies of 86.7% and 95.5%, respectively. On the other hand, the use of the fermented sludge products as external organic carbon sources in the SBR increased the external sludge reduction ratio to 42.5%. High-throughput sequencing demonstrated that the increase in the endogenous denitrifier community, polyphosphate-accumulating organisms, and fermentation bacteria were the main factors contributing to the increase in nutrient removal and excess sludge reduction. The economic evaluation indicated that the operational cost of the pilot-scale system saves 0.011$/m3 of sewage treated. PRACTITIONER POINTS: Fermented sludge addition effectively enhanced nutrient removal in pilot-scale SBR. Average effluent TN and PO4 3- -P decreased to 7.3 and 0.5 mg/L, respectively. Highest external sludge reduction rate was 42.5% in pilot-scale reactor. Sewage treatment cost can save 0.011$/m3 under advanced nutrient removal.
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Affiliation(s)
- Shenhua Yang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, China
- SDIC XinKai Water Environment Investment Co., Ltd, Beijing, China
| | - Haibin Chang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, China
| | - Yongzhen Peng
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, China
| | - Shujun Zhang
- Beijing Drainage Group Co., Ltd (BDG), Beijing, China
| | - Xiaoyu Han
- Beijing Drainage Group Co., Ltd (BDG), Beijing, China
| | - Shihao Sun
- SDIC XinKai Water Environment Investment Co., Ltd, Beijing, China
| | - Jinjin Liu
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, China
| | - Liang Zhang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, China
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Gao X, Xue X, Li L, Peng Y, Yao X, Zhang J, Liu W. Balance nitrogen and phosphorus efficient removal under carbon limitation in pilot-scale demonstration of a novel anaerobic/aerobic/anoxic process. WATER RESEARCH 2022; 223:118991. [PMID: 36001904 DOI: 10.1016/j.watres.2022.118991] [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: 06/13/2022] [Revised: 08/13/2022] [Accepted: 08/16/2022] [Indexed: 06/15/2023]
Abstract
Nutrient removal in carbon limited wastewater with high efficiency and energy saving remains a bottleneck for wastewater treatment plants (WWTPs). This study established a pilot-scale anaerobic/aerobic/anoxic (AOA) system with processing capacity of 100 m3/d for the first time. During almost 300 days of stable operation, enhanced nitrogen and phosphorus removal at a C/N of 5 was achieved, and the concentrations of total nitrogen (TN) and total phosphorus (TP) in effluent were 3.60 ± 1.55 and 0.24 ± 0.13 mg/L. Tetrasphaera and Candidatus Competibacter were the dominant phosphorus accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs) in the AOA system. Moreover, the low phosphorus release ensured sufficient intracellular carbon storage by endogenous denitrification, which was the critical factor for nitrogen and phosphorus removal in carbon limited wastewater. The denitrification phosphorus removal (DPR) ability further removed phosphorus and prevented secondary phosphorus release to maintain a low phosphorus concentration in effluent. Finally, rapid start-up, high nutrient removal efficiency and low energy consumption make the proposed AOA process suitable for application in newly constructed and renovated WWTPs.
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Affiliation(s)
- Xinjie Gao
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, PR China
| | - Xiaofei Xue
- Beijing Enterprises Water Group Limited (BEWG), Poly Int Plaza T3, Zone7, Beijing 100102, PR China.
| | - Lingyun Li
- Beijing Enterprises Water Group Limited (BEWG), Poly Int Plaza T3, Zone7, Beijing 100102, PR China
| | - Yongzhen Peng
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Key Laboratory of Beijing for Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100124, PR China.
| | - Xiaoyan Yao
- Beijing Enterprises Water Group Limited (BEWG), Poly Int Plaza T3, Zone7, Beijing 100102, PR China
| | - Jianxing Zhang
- Beijing Enterprises Water Group Limited (BEWG), Poly Int Plaza T3, Zone7, Beijing 100102, PR China
| | - Weihang Liu
- Beijing Enterprises Water Group Limited (BEWG), Poly Int Plaza T3, Zone7, Beijing 100102, PR China
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9
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Wang Y, Liang B, Kang F, Wang Y, Zhao C, Lyu Z, Zhu T, Zhang Z. An efficient anoxic/aerobic/aerobic/anoxic process for domestic sewage treatment: From feasibility to application. Front Microbiol 2022; 13:970548. [PMID: 35983333 PMCID: PMC9378819 DOI: 10.3389/fmicb.2022.970548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2022] [Accepted: 07/14/2022] [Indexed: 11/25/2022] Open
Abstract
In this paper, the anoxic/aerobic/aerobic/anoxic (AOOA) process was proposed using fixed biofilms in a continuous plug-flow multi-chamber reactor, and no sludge reflux operation was performed during the 190 days of operation. The reactor volume ratio of 1.5:2:1.5:1 (A/O/O/A) with the dissolved oxygen (DO) concentration of 2 mg L−1 in the aerobic zone was the optimal condition for reactor operation. According to the results obtained from the treatment of real domestic sewage, when the hydraulic retention time (HRT) was 6 h, the effluent of the reactor could meet the discharge standard even in cold conditions (13°C). Specifically, the elemental-sulfur-based autotrophic denitrification (ESAD) process contributed the most to the removal of total inorganic nitrogen (TIN) in the reactor. In addition, the use of vibration method was helpful in removing excess sludge from the biofilms of the reactor. Overall, the AOOA process is an efficient and convenient method for treating domestic sewage.
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