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Srivastava P, Abbassi R, Yadav A, Garaniya V, Asadnia M, Lewis T, Khan SJ. Influence of applied potential on treatment performance and clogging behaviour of hybrid constructed wetland-microbial electrochemical technologies. CHEMOSPHERE 2021; 284:131296. [PMID: 34182282 DOI: 10.1016/j.chemosphere.2021.131296] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/11/2021] [Revised: 05/04/2021] [Accepted: 06/17/2021] [Indexed: 06/13/2023]
Abstract
A two-stage hybrid Constructed Wetland (CW) integrated with a microbial fuel cell (MFC), and microbial electrolysis cell (MEC) has been assessed for treatment performance and clogging assessment and further compared with CW. The CW-MEC was operated with applied potential to the working electrode and compared with the performance of naturally adapted redox potential of the CW-MFC system. A complex synthetic municipal wastewater was used during the study, which was composed of trace metals, organics, inorganics, and dye. The study demonstrated that providing a constant potential to the working electrode in CW-MEC has resulted in high treatment performance and reduced sludge generation. The maximum chemical oxygen demand (COD), ammonium (NH4+), and phosphate (PO43-) removal achieved during treatment by CW-MEC at 24 h hydraulic retention time was 89 ± 6%, 72 ± 6% and 93 ± 2%, respectively. ICP-MS results indicated that trace metal removals were also higher in CW-MEC than in CW alone (p < 0.05). At the end of the experiment, significant volumetric change (total volume of the microcosm) occurred in CW (1.3 L), which indicates high sludge generation, whereas it was lesser in CW-MEC (0.3 L) and in CW-MFC (0.5 L). Further, Energy Dispersive X-ray (EDX) spectroscopy results indicated low levels of metal precipitation in the CW-MEC system. Based on the Shannon diversity index, the CW-MEC was assessed to be characterised by high species richness and diversity. The observations from this study indicate that the applied potential at the working electrode has a significant impact on treatment performance and clogging behaviour of the system.
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Affiliation(s)
- Pratiksha Srivastava
- Australian Maritime College, College of Sciences and Engineering, University of Tasmania, Launceston, 7248, Australia
| | - Rouzbeh Abbassi
- School of Engineering, Faculty of Science and Engineering, Macquarie University, Sydney, NSW, 2109, Australia.
| | - Asheesh Yadav
- Environment and Sustainability Department, CSIR-Institute of Minerals and Materials Technology, Bhubaneswar, 751013, India
| | - Vikram Garaniya
- Australian Maritime College, College of Sciences and Engineering, University of Tasmania, Launceston, 7248, Australia
| | - Mohsen Asadnia
- School of Engineering, Faculty of Science and Engineering, Macquarie University, Sydney, NSW, 2109, Australia
| | - Trevor Lewis
- School of Natural Sciences, College of Sciences and Engineering, University of Tasmania, Launceston, Tasmania, 7250, Australia
| | - Stuart J Khan
- School of Civil and Environmental Engineering, University of New South Wales, Sydney, NSW, Australia
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Optimization, Kinetics, Thermodynamic and Arrhenius Model of the Removal of Ciprofloxacin by Internal Electrolysis with Fe-Cu and Fe-C Materials. Processes (Basel) 2021. [DOI: 10.3390/pr9122110] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The ciprofloxacin (CIP) removal ability of a Fe-Cu electrolytic material was examined with respect to pH (2–9), time (15–150 min), shaking speed (100–250 rpm), material mass (0.2–3 g/L), temperature (298, 308, 323) and initial CIP concentration (30–200 mg/L). The Fe-Cu electrolytic materials were fabricated by the chemical plating method, and Fe-C materials were mechanically mixed from iron powder and graphite. The results show that at a pH value of 3, shaking time 120 min, shaking speed 250 rpm, a mass of Fe-Cu, Fe-C material of 2 g/L and initial CIP concentration of 203.79 mg/L, the CIP removal efficiency of Fe-Cu material reached 90.25% and that of Fe-C material was 85.12%. The removal of CIP on Fe-Cu and Fe-C materials follows pseudo-first-order kinetics. The activation energy of CIP removal of Fe-Cu material is 14.93 KJ/mol and of Fe-C material is 16.87 KJ/mol. The positive ΔH proves that CIP removal is endothermic. A negative entropy of 0.239 kJ/mol and 0.235 kJ/mol (which is near zero and is also relatively positive) indicated the rapid removal of the CIP molecules into the removed products.
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Peng L, Wang F, Zhang D, Fang C, van der Hoek JP, Chu W. Effect of oxidation ditch and anaerobic-anoxic-oxic processes on CX 3R-type disinfection by-product formation during wastewater treatment. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 770:145344. [PMID: 33515881 DOI: 10.1016/j.scitotenv.2021.145344] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/27/2020] [Accepted: 01/17/2021] [Indexed: 06/12/2023]
Abstract
The high chlorine dosages in wastewater treatment plants during the COVID-19 pandemic may result in increased formation of disinfection by-products (DBPs), posing great threat to the aquatic ecosystem of the receiving water body and the public health in the downstream area. However, limited information is available on the effect of biological wastewater treatment processes on the formation of CX3R-type DBPs. This study investigated the effect of oxidation ditch (OD) and anaerobic-anoxic-oxic (AAO), two widely used biological wastewater treatment processes, on the formation of five classes of CX3R-type DBPs, including trihalomethanes (THMs), haloacetic acids (HAAs), haloacetaldehydes (HALs), haloacetonitriles (HANs) and halonitromethanes (HNMs), during chlorination. Experimental results showed that biological treatment effectively reduced the dissolved organic carbon (DOC) and UV254, while it increased the dissolved organic nitrogen (DON), and therefore the ratio of DON/DOC. In addition, increases in the contents of soluble microbial product- and humic acid-like matters, and the transformation of high molecular weight (MW) fractions in the dissolved organic matter into low MW fractions were observed after OD and AAO processes. Although biological treatment effectively decreased the formation of Cl-THMs, Cl-HAAs, Cl-HANs and Cl-HNMs, the formation of DBCM, DBAA, BDCAA, DBCAA, DCAL, TCAL and DBAN (where C = chloro, B = bromo, D = di, T = tri) all increased significantly, due to the increased formation reactivity. Moreover, biological treatment increased the ratio of bromide/DOC and bromine incorporation into THMs, HAAs and DHANs except for HALs and THANs. Different from previous studies, this study revealed that biological treatment increased the formation of some DBPs, especially brominated DBPs, despite the efficient removal of organic matters. It provides insights into the DBP risk control in wastewater treatment, particularly during the COVID-19 pandemic.
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Affiliation(s)
- Liqi Peng
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Feifei Wang
- School of Environmental and Chemical Engineering, Shanghai University, Shanghai 200444, China
| | - Di Zhang
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Chao Fang
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China
| | - Jan Peter van der Hoek
- Department of Water Management, Delft University of Technology, P.O. Box 5048, 2600 GA Delft, the Netherlands; Research & Innovation, Waternet, Korte Ouderkerkerdijk 7, 1096 AC Amsterdam, the Netherlands
| | - Wenhai Chu
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai 200092, China.
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Dai H, Han T, Sun T, Zhu H, Wang X, Lu X. Nitrous oxide emission during denitrifying phosphorus removal process: A review on the mechanisms and influencing factors. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 278:111561. [PMID: 33126199 DOI: 10.1016/j.jenvman.2020.111561] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2020] [Revised: 08/17/2020] [Accepted: 10/21/2020] [Indexed: 06/11/2023]
Abstract
Excessive emissions of nitrogen (N) and phosphorus (P) pollutants are leading to increased eutrophication of water bodies. Biological N and P removal processes have become a research priority in the field of sewage treatment with the aim of improving sewage discharge standards in countries worldwide. Denitrifying P removal processes are more efficient for solving problems related to carbon source competition, sludge age conflict, and high aeration energy consumption compared to traditional biological N and P removal processes, but they are easy to produce nitrous oxide (N2O) in the process of sewage treatment. N2O is a greenhouse gas with a global warming potential approximately 190-270 times that of CO2 and 4-21 times that of CH4, which was produced and released into the environmental in denitrifying P removal systems under conditions of a low C/N ratio, high dissolved oxygen, and low activity of denitrifying phosphorus accumulating organisms (DPAOs). This paper reviews the emission characteristics and influencing factors of N2O during denitrifying P removal processes and proposes appropriate strategies for controlling the emission of N2O. This work serves as a basis for the development of new sewage treatment processes and the reduction of greenhouse gas emissions in future wastewater treatment plants.
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Affiliation(s)
- Hongliang Dai
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China; School of Environmental and Engineering, Huazhong University of Science and Technology, Wuhan, 430074, China; School of Energy and Environment, Southeast University, Nanjing, 210096, China.
| | - Ting Han
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China
| | - Tongshuai Sun
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China
| | - Hui Zhu
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China
| | - Xingang Wang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang, 212003, China.
| | - Xiwu Lu
- School of Energy and Environment, Southeast University, Nanjing, 210096, China
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Almomani F. Prediction the performance of multistage moving bed biological process using artificial neural network (ANN). THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 744:140854. [PMID: 32721673 DOI: 10.1016/j.scitotenv.2020.140854] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Revised: 06/13/2020] [Accepted: 07/08/2020] [Indexed: 06/11/2023]
Abstract
Complexity, uncertainty, and high dynamic nature of nutrient removal through biological processes (BPs) makes it difficult to model and control these processes, forcing designers to rely on approximations, probabilities, and assumptions. To cope with this difficult task and perform an effective and well-controlled BP operation, an artificial neural network (ANN) algorithm was developed to simulate, model, and control a three-stage (anaerobic/anoxic and MBBR) enhanced nutrient removal biological process (ENR-BP) challenging real wastewater. The effect of surface area loading rate (SALR), organic matters (OMs), nutrients (N & P), feed flow rate (Qfeed), hydraulic retention time (HRT), and internal recycle flow (IRF) on the performance of the ENR-BP to fulfil rigorous discharge limitations were evaluated. Experimental data was used to develop the appropriate architecture for the AAN using iterative steps of training and testing. Significant removals of chemical oxygen demand (COD) (89.2 to 98.3%), NH4+ (88.5 to 98.9%), and total phosphorus (TP) (77.9 to 99.9%) were achieved at a total HRT of 13.3 h (HRTZ-1 = 3 h, HRTZ-2 = 6 h and HRTZ-3 = 5.3 h) and an IRF value of 1.75. The ENR-BP treatment mechanism relies on the use of OMs as a source of energy for phosphorus bio-uptake and the simultaneous nitrification and denitrification (SND) of nitrogen compounds. The removal efficiencies in the proposed ENR-BP were four fold higher than the suspended growth process and in the same order of magnitude of 5-stage Bardenpho-MBBR. The developed ANN-based model provides an efficient and robust tool for predicting and forecasting the performance of the ENR-BP.
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Affiliation(s)
- Fares Almomani
- Department of Chemical Engineering, College of Engineering, Qatar University, P. O. Box 2713, Doha, Qatar.
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6
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Soliman M, Abdel-Halim H, Helmy E, El-Seddik M, Moharram M. A study of A 2/O process in El-Berka WWTP by replacing the anaerobic selector with UASB and adopting a hybrid system in the oxic zone. SEP SCI TECHNOL 2020. [DOI: 10.1080/01496395.2019.1641518] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Moataz Soliman
- Department of Civil Engineering, Environmental and Sanitary Engineering Division, Faculty of Engineering, Cairo University, Cairo, Egypt
| | - Hisham Abdel-Halim
- Department of Civil Engineering, Environmental and Sanitary Engineering Division, Faculty of Engineering, Cairo University, Cairo, Egypt
| | - Ehab Helmy
- Department of Civil Engineering, Environmental and Sanitary Engineering Division, Faculty of Engineering, Cairo University, Cairo, Egypt
| | - Mostafa El-Seddik
- Department of Civil Engineering, Environmental and Sanitary Engineering Division, Faculty of Engineering, Cairo University, Cairo, Egypt
- Department of Civil Engineering, Environmental and Sanitary Engineering Division, Institute of Aviation Engineering and Technology (IAET), Giza, Egypt
| | - Marwa Moharram
- Department of Civil Engineering, Environmental and Sanitary Engineering Division, Faculty of Engineering, Cairo University, Cairo, Egypt
- Construction Engineering Department, Faculty of Engineering, Egyptian Russian University
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7
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Sang W, Li D, Zhang Q, Mei L, Hao S, Feng Y, Jin X, Li C, Feng Y, Singh RP. Achieving enhanced biological nitrogen removal via 2450 MHz electromagnetic wave loading on returned sludge in anaerobic-anoxic-oxic process. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2020; 82:373-385. [PMID: 32941178 DOI: 10.2166/wst.2020.328] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
To evaluate the enhancing of the biological nitrogen removal effectiveness by electromagnetic wave loading on returned sludge in the A/A/O reactor, some experiments were completed with the returned sludge loaded by 2,450 MHz electromagnetic wave. The excess sludge yield and pollutant removal effect of the system were evaluated. Results showed that stronger denitrification effect and less sludge yield were achieved. When 30% of the returned sludge was loaded by electromagnetic wave, the actual denitrification efficiency increased by 7% without dosage. The dissolution of carbon, nitrogen and phosphorus from loaded returned sludge was detected, thus providing the system with a supplemental carbon source of 4.6 g/d SCOD. The specific oxygen uptake rate of the oxic activated sludge increased by 14%, and the denitrification rate of the anoxic activated sludge increased by 29%. Illumina MiSeq analysis showed that the microbial richness increased obviously, and denitrifying bacteria (i.e. Dechloromonas, Zoogloea and Azospira, etc.) were accumulated.
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Affiliation(s)
- Wenjiao Sang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China E-mail:
| | - Dong Li
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China E-mail:
| | - Qian Zhang
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China E-mail:
| | - Longjie Mei
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China E-mail:
| | - Shiwen Hao
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China E-mail:
| | - Yijie Feng
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China E-mail:
| | - Xi Jin
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China E-mail:
| | - Cuihua Li
- School of Civil Engineering and Architecture, Wuhan University of Technology, Wuhan 430070, China E-mail:
| | - Yangyang Feng
- Anhui Urban Construction Design Institute Co. Ltd, Hefei 230051, China
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Wang J, Chon K, Ren X, Kou Y, Chae KJ, Piao Y. Effects of beneficial microorganisms on nutrient removal and excess sludge production in an anaerobic-anoxic/oxic (A 2O) process for municipal wastewater treatment. BIORESOURCE TECHNOLOGY 2019; 281:90-98. [PMID: 30802820 DOI: 10.1016/j.biortech.2019.02.047] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2018] [Revised: 02/06/2019] [Accepted: 02/08/2019] [Indexed: 06/09/2023]
Abstract
The performances of anaerobic-anoxic-oxic processes with (A2O-B) and without (A2O-C) beneficial microorganisms were compared to provide valuable insights on how they are affected by changes in the microbial biomass and community composition. Although the A2O-B process showed lower concentrations of mixed liquor suspended solids and mixed liquor volatile suspended solids than the A2O-C process under identical operating conditions, the A2O-B process was more effective for the removal of organic materials and nutrients compared with the A2O-C process. Furthermore, the compressibility and settleability of the activated sludge were significantly better in the A2O-B process than in the A2O-C process due to the enhanced decomposition of extracellular polymeric substances. These results indicated that the inoculation of beneficial microorganisms may increase the proportions of microorganisms in relation to the removal of organic materials, nutrients (i.e., Zoogloea, Dechloromonas, Nitrospira, and Nitrosomonas) and the reduction of the excess sludge (i.e., Proteobacteria and Bacteroidetes).
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Affiliation(s)
- Jing Wang
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture (BUCEA), Beijing 100044, China
| | - Kangmin Chon
- Department of Environmental Engineering, College of Engineering, Kangwon National University, Kangwondaehak-gil, 1, Chuncheon-si, Gangwon-do 24341, Republic of Korea
| | - Xianghao Ren
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture (BUCEA), Beijing 100044, China.
| | - Yingying Kou
- Beijing Engineering Research Center of Sustainable Urban Sewage System Construction and Risk Control, Beijing University of Civil Engineering and Architecture (BUCEA), Beijing 100044, China
| | - Kyu-Jung Chae
- Department of Environmental Engineering, College of Engineering, Korea Maritime and Ocean University, 727 Taejong-ro, Yeongdo-gu, Busan 606-791, South Korea
| | - Yuanshan Piao
- Key Laboratory of Ground Water Resources and Environment of the Ministry of Education, College of Environment and Resources, Jilin University, 2519 Jiefang Road, Changchun 130021, China
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Su X, Chiang P, Pan S, Chen G, Tao Y, Wu G, Wang F, Cao W. Systematic approach to evaluating environmental and ecological technologies for wastewater treatment. CHEMOSPHERE 2019; 218:778-792. [PMID: 30508796 DOI: 10.1016/j.chemosphere.2018.11.108] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Revised: 11/09/2018] [Accepted: 11/15/2018] [Indexed: 06/09/2023]
Abstract
Evaluating the performance of wastewater treatment represents a challenging and complex task as it usually involves engineering, environmental and economic (3E) factors. In this study, we developed an 3E triangle model to evaluate the performance of environmental technologies (i.e., anaerobic-anoxic-oxic reactors, oxidation ditches, and membrane bioreactors) and ecological technologies (i.e., stabilization ponds, constructed wetlands, and slow-rate systems) for wastewater treatment. A total of 17 key performance indicators, such as energy consumption, pollutant removal, global warming potential and wastewater treatment fees, were considered in the 3E triangle model. The results indicated that, in terms of engineering performance, both the membrane bioreactors and constructed wetlands were stable, effective and reliable during their operating periods. When the environmental impacts of wastewater treatment technologies were compared via a life cycle assessment, the ecological technologies showed superior performance, in terms of environmental impacts, especially for the global warming potential and eutrophication potential. In general, environmental technologies exhibited higher treatment fees and unit construction costs because of their large power consumption and equipment costs. In contrast, ecological technologies had higher unit land use due to their large area requirements and low treatment capacity. In overall, both the membrane bioreactors and constructed wetlands showed excellent overall performance in the 3E triangle model. Wastewater treatment plant are typical case studies for addressing the interactions of water and energy elements. Reducing energy consumption is a hotspot for the research field of membrane bioreactors, while constructed wetlands are continually improved and optimized to have broad applications for rural wastewater treatment.
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Affiliation(s)
- Xiaoling Su
- College of the Environment and Ecology, Xiamen University, Xiang'an District, Xiamen City, Fujian, China.
| | - Penchi Chiang
- Graduate Institute of Environmental Engineering, Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan; Carbon Cycle Research Center, Taiwan University, No. 1, Sec. 4, Roosevelt Rd., Taipei 106, Taiwan.
| | - Shuyuan Pan
- Energy Technologies Area, Lawrence Berkeley National Laboratory, One Cyclotron Road, MS 90R-2121, Berkeley, United States.
| | - Guangjiao Chen
- College of the Environment and Ecology, Xiamen University, Xiang'an District, Xiamen City, Fujian, China.
| | - Yinren Tao
- College of the Environment and Ecology, Xiamen University, Xiang'an District, Xiamen City, Fujian, China.
| | - Gaojie Wu
- College of the Environment and Ecology, Xiamen University, Xiang'an District, Xiamen City, Fujian, China.
| | - Feifei Wang
- College of the Environment and Ecology, Xiamen University, Xiang'an District, Xiamen City, Fujian, China.
| | - Wenzhi Cao
- College of the Environment and Ecology, Xiamen University, Xiang'an District, Xiamen City, Fujian, China.
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10
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Ye C, Zhou Z, Li M, Liu Q, Xu T, Li J. Evaluation of simultaneous organic matters and nutrients removal from municipal wastewater using a novel bioreactor (D-A 2O) system. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2018; 218:509-515. [PMID: 29709819 DOI: 10.1016/j.jenvman.2018.04.075] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Revised: 03/26/2018] [Accepted: 04/16/2018] [Indexed: 06/08/2023]
Abstract
A novel bioreactor, the divisional influent dual-anaerobic-anoxic/oxic (D-A2O) system, was applied to treat municipal wastewater. This new system improved the removal efficiency of simultaneous organic matters and nutrients, and provided a reduction in the system's energy costs and sludge yield. Results from the reactor's 18 months of operation demonstrated the following optimal conditions for the 4 key parameters of the system: (1) a divisional ratio (DR) of 8:2 between the influent flow volumes fed into the anaerobic and anoxic tanks, (2) a hydraulic retention time (HRT) of 6 h, (3) a R:r ratio of 200%:100% between the mixed liquor return ratio (R) and the return activated sludge ratio (r), and (4) an alternative operating time (tA/B) of 1 h for the A/B anaerobic-anoxia series. Under optimal conditions, the system showed a high removal efficiency for the chemical oxygen demand (COD), total nitrogen (TN), ammonia nitrogen (NH3-N), and total phosphorus (TP) removals, with the average removal efficiencies (with a standard deviation of less than 3%) being 95.23%, 80.64%, 90.42%, and 90.03%, respectively. The final concentration ranges of COD, TN, NH3-N, and TP in the effluent were 26-48 mg L-1, 6.11-11.03 mg L-1, 2.93-4.04 mg L-1, and 0.21-0.45 mg L-1, respectively. The concentrations of the pollutants in the effluent from the D-A2O system were lower than those required for Level 1A (Chinese quality of wastewater discharge standard GB18918-2002). According to the results, we concluded that the divisional influent dual-anaerobic-anoxic system (which integrated the A2O and sequencing batch reactor (SBR) process) was successfully provided sufficient carbon sources for denitrification and phosphorus uptake without external carbon addition. Compared to the conventional anaerobic-anoxic/oxic (A2O) process, the D-A2O system offers a high removal efficiency, simple operation, and significant energy saving of about 0.276 kWh m-3 based on the volume of the treated water. Therefore, the new D-A2O system has a strong potential for use in treatment plants.
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Affiliation(s)
- Changbing Ye
- School of Chemical Biology and Environment, Yuxi Normal University, Yuxi 653100, Yunnan, China
| | - Zhiming Zhou
- Yunnan Dianqing Environmental Technology Co., Ltd., Yuxi 653100, Yunnan, China
| | - Ming Li
- School of Chemical Biology and Environment, Yuxi Normal University, Yuxi 653100, Yunnan, China
| | - Qin Liu
- School of Chemical Biology and Environment, Yuxi Normal University, Yuxi 653100, Yunnan, China
| | - Tiantian Xu
- School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
| | - Jia Li
- School of Chemical Biology and Environment, Yuxi Normal University, Yuxi 653100, Yunnan, China.
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11
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Zhang S, Huang Z, Lu S, Zheng J, Zhang X. Nutrients removal and bacterial community structure for low C/N municipal wastewater using a modified anaerobic/anoxic/oxic (mA2/O) process in North China. BIORESOURCE TECHNOLOGY 2017; 243:975-985. [PMID: 28738552 DOI: 10.1016/j.biortech.2017.07.048] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2017] [Revised: 07/07/2017] [Accepted: 07/09/2017] [Indexed: 06/07/2023]
Abstract
A modified anaerobic/anoxic/oxic (mA2/O) process based on utilizing the internal carbon source and adding polypropylene carriers was operated for 90d to investigate the nutrients removal performance and bacterial community. This system exhibited a stable and efficient performance, particularly, in removing the NH4+-N and total phosphorus. The results of high-throughput sequencing showed that the 13 dominant genera containing Pseudomonas, Comamonas, Arcobacter, Nitrobacteria, Nitrosospira, Nitrosomonas, Bacteroides, Flavobacterium, Rhizobium, Acinetobacter, Zoogloea, Rhodocyclus and Moraxella were shared by five zones, inferring that they were the essential players in treating low C/N (below 5.0) municipal wastewater around 10°C. The average abundance of Nitrosospira (4.21%) was higher than that of Nitrosomonas (2.93%), suggested that Nitrosospira performed well under low temperature for nitrification. Additionally, both known Rhodocyclus-related PAOs and GAOs Competibacter were not detected possibly due to low temperature. Redundancy analysis (RDA) indicated that DO played more important roles in regulating bacterial community composition than HRT.
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Affiliation(s)
- Shihua Zhang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan 243002, China
| | - Zhijia Huang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan 243002, China.
| | - Shujian Lu
- Faculty of Graduate Studies, Anhui University of Technology, Ma'anshan 243002, China
| | - Jun Zheng
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan 243002, China
| | - Xinxi Zhang
- School of Civil Engineering and Architecture, Anhui University of Technology, Ma'anshan 243002, China
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12
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Nitrogen and phosphorus removal using fluidized-carriers in a full-scale A 2 O biofilm system. Biochem Eng J 2016. [DOI: 10.1016/j.bej.2016.08.004] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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13
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Application of real-time feedback control strategies based on effluent NH4-N and NO X -N concentrations in an A2/O process. KOREAN J CHEM ENG 2013. [DOI: 10.1007/s11814-013-0084-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Lai TM, Dang HV, Nguyen DD, Yim S, Hur J. Wastewater treatment using a modified A2O process based on fiber polypropylene media. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2011; 46:1068-1074. [PMID: 21762009 DOI: 10.1080/10934529.2011.590382] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The removal rates of organics and nutrients in municipal wastewater were examined using a laboratory-scale Anaerobic/Anoxic/Oxic (A2O) process modified with fiber polypropylene media at different operational conditions. The system demonstrated excellent performance with the removal rates of chemical oxygen demand (COD), total nitrogen (TN) and total phosphorous (TP) ranging from 91% to 98%, from 48% to 63%, and from 56% to 71%, respectively. Our system was superior to those previously reported based on more complex biofilm reactors, particularly from an economic point of view. For our system, a considerable reduction of COD (55%-68%) occurred even in the anaerobic reactor. The removal rates of COD and nutrients exhibited a slight decreasing trend with a higher organic loading rate (OLR) (0.5 to 2.2 kg COD m(-3) day(-1)) or with a shorter hydraulic retention time (HRT). The results may be attributed to the competition between nitrifying and heterotrophic bacteria and/or the insufficient time for biological uptake. It is expected that applying fiber polypropylene media to a conventional A2O process may significantly enhance the treatment efficacy of organics and nutrients as a cost-effective strategy.
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Affiliation(s)
- Tien M Lai
- Department of Environment and Energy, Sejong University, Seoul, South Korea
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