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Li D, Yang C, Li Y, Chen Y, Huang D, Liu Y. Learning a neural network-based soft sensor with double-errors parallel optimization towards effluent variable prediction in wastewater treatment plants. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 366:121907. [PMID: 39047433 DOI: 10.1016/j.jenvman.2024.121907] [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: 01/12/2024] [Revised: 06/14/2024] [Accepted: 07/14/2024] [Indexed: 07/27/2024]
Abstract
With the development of machine learning and artificial intelligence (ML/AI) models, data-driven soft sensors, especially the neural network-based, have widespread utilization for the prediction of key water quality indicators in wastewater treatment plants (WWTPs). However, recent research indicates that the prediction performance and computational efficiency are greatly compromised due to the time-varying, nonlinear and high-dimensional nature of the wastewater treatment process. This paper proposes a neural network-based soft sensor with double-errors parallel optimization to achieve more accurate prediction for effluent variables timely. Firstly, relying on the Activity Based Classification (ABC) principle, an ensemble variable selection method that combines Pearson correlation coefficient (PCC) and mutual information (MI) is introduced to select the optimal process variables as auxiliary variables, thereby reducing the data dimensionality and simplifying the model complexity. Subsequently, a double-errors parallel optimization methodology with minimizing both point prediction error and distribution error simultaneously is proposed, aiming to enhancing the training efficiency and the fitting quality of neural networks. Finally, the effectiveness is quantitatively assessed in two datasets collected from the Benchmark Simulation Model no. 1 (BMS1) and an actual oxidation ditch WWTP. The experimental results illustrate that the proposed soft sensor achieves precise effluent variable prediction, with RMSE, MAE and R2 values being 0.0606, 0.0486, 0.99930, and 0.06939, 0.05381, 0.98040, respectively. Consequently, this soft sensor can expedite the convergence speed in the neural network training process and enhance the prediction performance, thereby contributing to the effective optimization management of WWTPs.
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Affiliation(s)
- Dong Li
- The School of Automation, Central South University, Changsha, 410083, China.
| | - Chunhua Yang
- The School of Automation, Central South University, Changsha, 410083, China
| | - Yonggang Li
- The School of Automation, Central South University, Changsha, 410083, China
| | - Yan Chen
- The Key Laboratory of Autonomous Systems and Networked Control, Ministry of Education, School of Automation Science & Engineering, South China University of Technology, Wushan Road, Guang Zhou, 510640, China; The School of Data Science and Information Engineering, Guizhou Minzu University, Guiyang, 550025, China
| | - Daoping Huang
- The Key Laboratory of Autonomous Systems and Networked Control, Ministry of Education, School of Automation Science & Engineering, South China University of Technology, Wushan Road, Guang Zhou, 510640, China
| | - Yiqi Liu
- The Key Laboratory of Autonomous Systems and Networked Control, Ministry of Education, School of Automation Science & Engineering, South China University of Technology, Wushan Road, Guang Zhou, 510640, China.
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2
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Ibrahim M, Haider A, Lim JW, Mainali B, Aslam M, Kumar M, Shahid MK. Artificial neural network modeling for the prediction, estimation, and treatment of diverse wastewaters: A comprehensive review and future perspective. CHEMOSPHERE 2024; 362:142860. [PMID: 39019174 DOI: 10.1016/j.chemosphere.2024.142860] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 07/03/2024] [Accepted: 07/14/2024] [Indexed: 07/19/2024]
Abstract
The application of artificial neural networks (ANNs) in the treatment of wastewater has achieved increasing attention, as it enhances the efficiency and sustainability of wastewater treatment plants (WWTPs). This paper explores the application of ANN-based models in WWTPs, focusing on the latest published research work, by presenting the effectiveness of ANNs in predicting, estimating, and treatment of diverse types of wastewater. Furthermore, this review comprehensively examines the applicability of the ANNs in various processes and methods used for wastewater treatment, including membrane and membrane bioreactors, coagulation/flocculation, UV-disinfection processes, and biological treatment systems. Additionally, it provides a detailed analysis of pollutants viz organic and inorganic substances, nutrients, pharmaceuticals, drugs, pesticides, dyes, etc., from wastewater, utilizing both ANN and ANN-based models. Moreover, it assesses the techno-economic value of ANNs, provides cost estimation and energy analysis, and outlines promising future research directions of ANNs in wastewater treatment. AI-based techniques are used to predict parameters such as chemical oxygen demand (COD) and biological oxygen demand (BOD) in WWTP influent. ANNs have been formed for the estimation of the removal efficiency of pollutants such as total nitrogen (TN), total phosphorus (TP), BOD, and total suspended solids (TSS) in the effluent of WWTPs. The literature also discloses the use of AI techniques in WWT is an economical and energy-effective method. AI enhances the efficiency of the pumping system, leading to energy conservation with an impressive average savings of approximately 10%. The system can achieve a maximum energy savings state of 25%, accompanied by a notable reduction in costs of up to 30%.
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Affiliation(s)
- Muhammad Ibrahim
- Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, PR China; University of Chinese Academy of Sciences, Beijing 100049, PR China
| | - Adnan Haider
- Department of Environmental and IT Convergence Engineering, Chungnam National University, Daejeon 34134, Republic of Korea
| | - Jun Wei Lim
- HICoE-Centre for Biofuel and Biochemical Research, Institute of Sustainable Energy and Resources, Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 32610, Seri Iskandar, Perak Darul Ridzuan, Malaysia; Department of Biotechnology, Saveetha School of Engineering, Saveetha Institute of Medical and Technical Sciences, Saveetha University, 602105, Chennai, India
| | - Bandita Mainali
- School of Engineering, Faculty of Science and Engineering, Macquarie University, Sydney 2109, Australia
| | - Muhammad Aslam
- Membrane Systems Research Group, Department of Chemical Engineering, COMSATS University Islamabad, Lahore Campus, Lahore, Pakistan; Faculty of Engineering & Quantity Surveying, INTI International University (INTI-IU), Persiaran Perdana BBN, Putra Nilai, Nilai, 71800, Negeri Sembilan, Malaysia
| | - Mathava Kumar
- Department of Civil Engineering, Indian Institute of Technology Madras, Chennai, Tamil Nadu, 600036, India
| | - Muhammad Kashif Shahid
- Department of Environmental and IT Convergence Engineering, Chungnam National University, Daejeon 34134, Republic of Korea; School of Engineering, Faculty of Science and Engineering, Macquarie University, Sydney 2109, Australia; Faculty of Civil Engineering and Architecture, National Polytechnic Institute of Cambodia (NPIC), Phnom Penh 12409, Cambodia.
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3
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Wang H, He W, Zhang Z, Liu X, Yang Y, Xue H, Xu T, Liu K, Xian Y, Liu S, Zhong Y, Gao X. Spatio-temporal evolution mechanism and dynamic simulation of nitrogen and phosphorus pollution of the Yangtze River economic Belt in China. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2024; 357:124402. [PMID: 38906405 DOI: 10.1016/j.envpol.2024.124402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 06/03/2024] [Accepted: 06/18/2024] [Indexed: 06/23/2024]
Abstract
Excess nitrogen and phosphorus inputs are the main causes of aquatic environmental deterioration. Accurately quantifying and dynamically assessing the regional nitrogen and phosphorus pollution emission (NPPE) loads and influencing factors is crucial for local authorities to implement and formulate refined pollution reduction management strategies. In this study, we constructed a methodological framework for evaluating the spatio-temporal evolution mechanism and dynamic simulation of NPPE. We investigated the spatio-temporal evolution mechanism and influencing factors of NPPE in the Yangtze River Economic Belt (YREB) of China through the pollution load accounting model, spatial correlation analysis model, geographical detector model, back propagation neural network model, and trend analysis model. The results show that the NPPE inputs in the YREB exhibit a general trend of first rising and then falling, with uneven development among various cities in each province. Nonpoint sources are the largest source of land-based NPPE. Overall, positive spatial clustering of NPPE is observed in the cities of the YREB, and there is a certain enhancement in clustering. The GDP of the primary industry and cultivated area are important human activity factors affecting the spatial distribution of NPPE, with economic factors exerting the greatest influence on the NPPE. In the future, the change in NPPE in the YREB at the provincial level is slight, while the nitrogen pollution emissions at the municipal level will develop towards a polarization trend. Most cities in the middle and lower reaches of the YREB in 2035 will exhibit medium to high emissions. This study provides a scientific basis for the control of regional NPPE, and it is necessary to strengthen cooperation and coordination among cities in the future, jointly improve the nitrogen and phosphorus pollution tracing and control management system, and achieve regional sustainable development.
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Affiliation(s)
- Huihui Wang
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; School of Environment, Beijing Normal University, Beijing, 100875, China; Key Laboratory of Coastal Water Environmental Management and Water Ecological Restoration of Guangdong Higher Education Institutes, Beijing Normal University, Zhuhai, 519087, China.
| | - Wanlin He
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; Zhixing College, Beijing Normal University, Zhuhai, 519087, China
| | - Zeyu Zhang
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; Zhixing College, Beijing Normal University, Zhuhai, 519087, China
| | - Xinhui Liu
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; School of Environment, Beijing Normal University, Beijing, 100875, China; Key Laboratory of Coastal Water Environmental Management and Water Ecological Restoration of Guangdong Higher Education Institutes, Beijing Normal University, Zhuhai, 519087, China
| | - Yunsong Yang
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; School of Environment, Beijing Normal University, Beijing, 100875, China; Key Laboratory of Coastal Water Environmental Management and Water Ecological Restoration of Guangdong Higher Education Institutes, Beijing Normal University, Zhuhai, 519087, China
| | - Hanyu Xue
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; Zhixing College, Beijing Normal University, Zhuhai, 519087, China; Research Institute of Urban Renewal, Zhuhai Institute of Urban Planning and Design, Zhuhai, 519100, China
| | - Tingting Xu
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; Huitong College, Beijing Normal University, Zhuhai, 519087, China
| | - Kunlin Liu
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; Huitong College, Beijing Normal University, Zhuhai, 519087, China
| | - Yujie Xian
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; International Business Faculty, Beijing Normal University, Zhuhai, 519087, China
| | - Suru Liu
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; Zhixing College, Beijing Normal University, Zhuhai, 519087, China
| | - Yuhao Zhong
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; Zhixing College, Beijing Normal University, Zhuhai, 519087, China
| | - Xiaoyong Gao
- Advanced Institute of Natural Sciences, Beijing Normal University, Zhuhai, 519087, China; Huitong College, Beijing Normal University, Zhuhai, 519087, China; Department of Geography, National University of Singapore, Singapore, 117570, Singapore
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Li D, Yang C, Li Y. A multi-subsystem collaborative Bi-LSTM-based adaptive soft sensor for global prediction of ammonia-nitrogen concentration in wastewater treatment processes. WATER RESEARCH 2024; 254:121347. [PMID: 38422697 DOI: 10.1016/j.watres.2024.121347] [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: 10/03/2023] [Revised: 01/03/2024] [Accepted: 02/19/2024] [Indexed: 03/02/2024]
Abstract
Ammonia-nitrogen concentration is a key water quality indicator, which reflects changes in pollutant components during wastewater treatment processes. The timely and accurate detection results contribute to optimizing control and operational management of wastewater treatment plants (WWTPs), but current detection methods only focus on the effluent location. This paper proposes a multi-subsystem collaborative Bi-LSTM-based adaptive soft sensor to achieve the global prediction of ammonia-nitrogen concentration. Firstly, the wastewater treatment process is divided into several independent subsystems depending on the reaction mechanism, and the variable selection is performed using mutual information. Subsequently, the bidirectional long short-term memory network (Bi-LSTM) is employed to construct a model for predicting ammonia-nitrogen concentration within each subsystem, and the outputs between neighboring subsystems are incorporated as a set of new variables added into the training dataset to strengthen their connection. Finally, to address performance degradation caused by environmental factors, a probability density function (PDF)-based dynamic moving window method is proposed to enhance the robustness. The effectiveness and superiority of the proposed soft sensor are validated in the Benchmark Simulation Model no. 1 (BSM1). The experimental results demonstrate that the proposed soft sensor can accurately predict the global ammonia-nitrogen concentration in the face of different weather conditions including sunny, rainy, and stormy days. This study contributes to the stable operation of WWTPs with higher treatment efficiency and lower economic costs.
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Affiliation(s)
- Dong Li
- The School of Automation, Central South University, Changsha 410 083, China
| | - Chunhua Yang
- The School of Automation, Central South University, Changsha 410 083, China.
| | - Yonggang Li
- The School of Automation, Central South University, Changsha 410 083, China
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5
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Shang Z, Cai C, Guo Y, Huang X, Peng K, Guo R, Wei Z, Wu C, Cheng S, Liao Y, Hung CY, Liu J. Direct and indirect monitoring methods for nitrous oxide emissions in full-scale wastewater treatment plants: A critical review. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 358:120842. [PMID: 38599092 DOI: 10.1016/j.jenvman.2024.120842] [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: 01/17/2024] [Revised: 03/17/2024] [Accepted: 04/02/2024] [Indexed: 04/12/2024]
Abstract
Mitigation of nitrous oxide (N2O) emissions in full-scale wastewater treatment plant (WWTP) has become an irreversible trend to adapt the climate change. Monitoring of N2O emissions plays a fundamental role in understanding and mitigating N2O emissions. This paper provides a comprehensive review of direct and indirect N2O monitoring methods. The techniques, strengths, limitations, and applicable scenarios of various methods are discussed. We conclude that the floating chamber technique is suitable for capturing and interpreting the spatiotemporal variability of real-time N2O emissions, due to its long-term in-situ monitoring capability and high data acquisition frequency. The monitoring duration, location, and frequency should be emphasized to guarantee the accuracy and comparability of acquired data. Calculation by default emission factors (EFs) is efficient when there is a need for ambiguous historical N2O emission accounts of national-scale or regional-scale WWTPs. Using process-specific EFs is beneficial in promoting mitigation pathways that are primarily focused on low-emission process upgrades. Machine learning models exhibit exemplary performance in the prediction of N2O emissions. Integrating mechanistic models with machine learning models can improve their explanatory power and sharpen their predictive precision. The implementation of the synergy of nutrient removal and N2O mitigation strategies necessitates the calibration and validation of multi-path mechanistic models, supported by long-term continuous direct monitoring campaigns.
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Affiliation(s)
- Zhenxin Shang
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China
| | - Chen Cai
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Institute of Carbon Neutrality, Tongji University, Shanghai, 200092, PR China.
| | - Yanli Guo
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China
| | - Xiangfeng Huang
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Institute of Carbon Neutrality, Tongji University, Shanghai, 200092, PR China
| | - Kaiming Peng
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Institute of Carbon Neutrality, Tongji University, Shanghai, 200092, PR China
| | - Ru Guo
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Institute of Carbon Neutrality, Tongji University, Shanghai, 200092, PR China
| | - Zhongqing Wei
- Fuzhou Water Group Co., Ltd, Fuzhou, 350000, PR China
| | - Chenyuan Wu
- Fuzhou Water Group Co., Ltd, Fuzhou, 350000, PR China
| | - Shunjian Cheng
- Fuzhou City Construction Design & Research Institute Co., Ltd, Fuzhou, 350000, PR China
| | - Youxiang Liao
- Fuzhou City Construction Design & Research Institute Co., Ltd, Fuzhou, 350000, PR China
| | - Chih-Yu Hung
- Environment and Climate Change, 351 Saint-Joseph Blvd., 9th Floor. Gatineau, Quebec, K1A 0H3, Canada
| | - Jia Liu
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, PR China; Institute of Carbon Neutrality, Tongji University, Shanghai, 200092, PR China
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6
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Li X, Ge J, Liu Z, Yang S, Wang L, Liu Y. Estimating the methane flux of the Dajiuhu subalpine peatland using machine learning algorithms and the maximal information coefficient technique. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 916:170241. [PMID: 38278264 DOI: 10.1016/j.scitotenv.2024.170241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2023] [Revised: 01/04/2024] [Accepted: 01/15/2024] [Indexed: 01/28/2024]
Abstract
The eddy covariance (EC) technique has emerged as the most widely used method for long-term continuous methane flux (FCH4) observations. However, the completeness of the FCH4 time series is limited by instrumental failures and data quality issues, resulting in missing data gaps ranging from 20 % to 90 %. In this situation, the excellent performance of machine learning (ML) algorithms in filling missing FCH4 data has provided a foundation for developing regional-scale FCH4 models. In this study, we established estimation models for FCH4 utilizing random forest (RF), support vector machine (SVM), back propagation (BP) and nonlinear multiple regression (MLR) algorithms. The maximal information coefficient (MIC) technique was employed to identify and rank the environmental factors that were correlated with FCH4. Our findings revealed that soil temperature (Ts), soil water content (SWC) and air temperature (Ta) were the primary environmental factors influencing FCH4. Among the four algorithms, from perspectives of model accuracy and relatively small number of driving factors, the RF models exhibited the best performance, followed by BP and SVM, whereas MLR demonstrated the lowest performance. Among the 144 RF models established using nine datasets, RF model with 8 driving factors in all-year (RFall-year8) could capture seasonal variations. Ultimately, we recommend (RFall-year8 as the optimal model for estimating FCH4 in the Dajiuhu subalpine peatland.
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Affiliation(s)
- Xue Li
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; Laboratory of Basin Hydrology and Wetland Eco-restoration, China University of Geosciences, Wuhan 430074, China; Hubei Key Laboratory of Wetland Evolution and Ecological Restoration, China University of Geosciences (Wuhan), Wuhan 430078, China; Institution of Ecology and Environmental Sciences, China University of Geosciences (Wuhan), Wuhan 430078, China
| | - Jiwen Ge
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; Laboratory of Basin Hydrology and Wetland Eco-restoration, China University of Geosciences, Wuhan 430074, China; Hubei Key Laboratory of Wetland Evolution and Ecological Restoration, China University of Geosciences (Wuhan), Wuhan 430078, China; Institution of Ecology and Environmental Sciences, China University of Geosciences (Wuhan), Wuhan 430078, China.
| | - Ziwei Liu
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; Laboratory of Basin Hydrology and Wetland Eco-restoration, China University of Geosciences, Wuhan 430074, China; Hubei Key Laboratory of Wetland Evolution and Ecological Restoration, China University of Geosciences (Wuhan), Wuhan 430078, China; Institution of Ecology and Environmental Sciences, China University of Geosciences (Wuhan), Wuhan 430078, China
| | - Shiyu Yang
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; Laboratory of Basin Hydrology and Wetland Eco-restoration, China University of Geosciences, Wuhan 430074, China; Hubei Key Laboratory of Wetland Evolution and Ecological Restoration, China University of Geosciences (Wuhan), Wuhan 430078, China; Institution of Ecology and Environmental Sciences, China University of Geosciences (Wuhan), Wuhan 430078, China
| | - Linlin Wang
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; Laboratory of Basin Hydrology and Wetland Eco-restoration, China University of Geosciences, Wuhan 430074, China; Hubei Key Laboratory of Wetland Evolution and Ecological Restoration, China University of Geosciences (Wuhan), Wuhan 430078, China; Institution of Ecology and Environmental Sciences, China University of Geosciences (Wuhan), Wuhan 430078, China
| | - Ye Liu
- School of Environmental Studies, China University of Geosciences, Wuhan 430074, China; Laboratory of Basin Hydrology and Wetland Eco-restoration, China University of Geosciences, Wuhan 430074, China; Hubei Key Laboratory of Wetland Evolution and Ecological Restoration, China University of Geosciences (Wuhan), Wuhan 430078, China; Institution of Ecology and Environmental Sciences, China University of Geosciences (Wuhan), Wuhan 430078, China
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7
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Yu Y, Zeng H, Wang L, Wang R, Zhou H, Zhong L, Zeng J, Chen Y, Tan Z. Modeling nitrogen removal performance based on novel microbial activity indicators in WWTP by machine learning and biological interpretation. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 354:120256. [PMID: 38341909 DOI: 10.1016/j.jenvman.2024.120256] [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: 12/13/2023] [Revised: 01/20/2024] [Accepted: 01/28/2024] [Indexed: 02/13/2024]
Abstract
Modeling the pollutant removal performance of wastewater treatment plants (WWTPs) plays a crucial role in regulating their operation, mitigating effluent anomalies and reducing operating costs. Pollutants removal in WWTPs is closely related to microbial activity. However, there is extremely limited knowledge on the models accurately characterizing pollutants removal performance by microbial activity indicators. This study proposed a novel specific oxygen uptake rate (SOURATP) with adenosine triphosphate (ATP) as biomass. Firstly, it was found that SOURATP and total nitrogen (TN) removal rate showed similar fluctuated trends, and their correlation was stronger than that of TN removal rate and common SOURMLSS with mixed liquor suspended solids (MLSS) as biomass. Then, support vector regressor (SVR), K-nearest neighbor regressor (KNR), linear regressor (LR), and random forest (RF) models were developed to predict TN removal rate only with microbial activity as features. Models utilizing the novel SOURATP resulted in better performance than those based on SOURMLSS. A model fusion (MF) algorithm based on the above four models was proposed to enhance the accuracy with lower root mean square error (RMSE) of 2.25 mg/L/h and explained 75% of the variation in the test data with SOURATP as features as opposed to other base learners. Furthermore, the interpretation of predictive results was explored through microbial community structure and metabolic pathway. Strong correlations were found between SOURATP and the proportion of nitrifiers in aerobic pool, as well as between heterotrophic bacteria respiratory activity (SOURATP_HB) and the proportion of denitrifies in anoxic pool. SOURATP also displayed consistent positive responses with most key enzymes in Embden-Meyerhof-Parnas pathway (EMP), tricarboxylic acid cycle (TCA) and oxidative phosphorylation cycle. In this study, SOURATP provides a reliable indication of the composition and metabolic activity of nitrogen removal bacteria, revealing the potential reasons underlying the accurate predictive result of nitrogen removal rates based on novel microbial activity indicators. This study offers new insights for the prediction and further optimization operation of WWTPs from the perspective of microbial activity regulation.
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Affiliation(s)
- Yadan Yu
- CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Hao Zeng
- CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Liyun Wang
- CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Rui Wang
- China MCC5 Group Corp.Ltd., Chengdu, China
| | - Houzhen Zhou
- CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China
| | - Liang Zhong
- Jintang Haitian Water Co., Chengdu, 610400, China
| | - Jun Zeng
- Jintang Haitian Water Co., Chengdu, 610400, China
| | - Yangwu Chen
- CAS Key Laboratory of Environmental and Applied Microbiology, 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, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu, 610041, China.
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8
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Ye G, Wan J, Deng Z, Wang Y, Chen J, Zhu B, Ji S. Prediction of effluent total nitrogen and energy consumption in wastewater treatment plants: Bayesian optimization machine learning methods. BIORESOURCE TECHNOLOGY 2024; 395:130361. [PMID: 38286171 DOI: 10.1016/j.biortech.2024.130361] [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: 12/02/2023] [Revised: 01/18/2024] [Accepted: 01/18/2024] [Indexed: 01/31/2024]
Abstract
The control of effluent total nitrogen (TN) and total energy consumption (TEC) is a key issue in managing wastewater treatment plants. In this study, effluent TN and TEC predictive models were established by selecting influent water quality and process control indicators as input features. The prediction performance of machine learning methods under different random seeds was explored, the moving average method was used for data amplification, and the Bayesian algorithm was used for hyperparameter optimization. The results showed that compared with the traditional hyperparameter optimization method for effluent TN prediction, the coefficient of determination (R2) increased by 0.092 and 0.067, reaching 0.725, and the root mean square error (RMSE) decreased by 0.262 and 0.215 mg/L, reaching 1.673 mg/L, respectively, after Bayesian optimization and data amplification. During TEC prediction, R2 increased by 0.068 and 0.042, reaching 0.884, and the RMSE decreased by 232.444 and 197.065 kWh, reaching 1305.829 kWh, respectively.
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Affiliation(s)
- Gang Ye
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Jinquan Wan
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China.
| | - Zhicheng Deng
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Yan Wang
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Jian Chen
- College of Environment and Energy, South China University of Technology, Guangzhou 510006, China
| | - Bin Zhu
- Guangdong Shunkong Zihua Technology Co, Ltd, Foshan 528300, China
| | - Shiming Ji
- Guangdong Shunkong Zihua Technology Co, Ltd, Foshan 528300, China
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9
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Lin J, Ding B, Song Z, Li Z, Li S. A Model of Multi-Finger Coordination in Keystroke Movement. SENSORS (BASEL, SWITZERLAND) 2024; 24:1221. [PMID: 38400379 PMCID: PMC10892657 DOI: 10.3390/s24041221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 02/04/2024] [Accepted: 02/13/2024] [Indexed: 02/25/2024]
Abstract
In multi-finger coordinated keystroke actions by professional pianists, movements are precisely regulated by multiple motor neural centers, exhibiting a certain degree of coordination in finger motions. This coordination enhances the flexibility and efficiency of professional pianists' keystrokes. Research on the coordination of keystrokes in professional pianists is of great significance for guiding the movements of piano beginners and the motion planning of exoskeleton robots, among other fields. Currently, research on the coordination of multi-finger piano keystroke actions is still in its infancy. Scholars primarily focus on phenomenological analysis and theoretical description, which lack accurate and practical modeling methods. Considering that the tendon of the ring finger is closely connected to adjacent fingers, resulting in limited flexibility in its movement, this study concentrates on coordinated keystrokes involving the middle and ring fingers. A motion measurement platform is constructed, and Leap Motion is used to collect data from 12 professional pianists. A universal model applicable to multiple individuals for multi-finger coordination in keystroke actions based on the backpropagation (BP) neural network is proposed, which is optimized using a genetic algorithm (GA) and a sparrow search algorithm (SSA). The angular rotation of the ring finger's MCP joint is selected as the model output, while the individual difference information and the angular data of the middle finger's MCP joint serve as inputs. The individual difference information used in this study includes ring finger length, middle finger length, and years of piano training. The results indicate that the proposed SSA-BP neural network-based model demonstrates superior predictive accuracy, with a root mean square error of 4.8328°. Based on this model, the keystroke motion of the ring finger's MCP joint can be accurately predicted from the middle finger's keystroke motion information, offering an evaluative method and scientific guidance for the training of multi-finger coordinated keystrokes in piano learners.
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Affiliation(s)
| | - Baihui Ding
- Key Laboratory of Mechanism Theory and Equipment Design, Ministry of Education, Tianjin University, Tianjin 300350, China; (J.L.); (Z.S.); (Z.L.); (S.L.)
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10
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Niu C, Song X, Hao J, Zhao M, Yuan Y, Liu J, Yue T. Identification of Burkholderia gladioli pv. cocovenenans in Black Fungus and Efficient Recognition of Bongkrekic Acid and Toxoflavin Producing Phenotype by Back Propagation Neural Network. Foods 2024; 13:351. [PMID: 38275718 PMCID: PMC10815087 DOI: 10.3390/foods13020351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 01/10/2024] [Accepted: 01/16/2024] [Indexed: 01/27/2024] Open
Abstract
Burkholderia gladioli pv. cocovenenans is a serious safety issue in black fungus due to the deadly toxin, bongkrekic acid. This has triggered the demand for an efficient toxigenic phenotype recognition method. The objective of this study is to develop an efficient method for the recognition of toxin-producing B. gladioli strains. The potential of multilocus sequence typing and a back propagation neural network for the recognition of toxigenic B. cocovenenans was explored for the first time. The virulent strains were isolated from a black fungus cultivation environment in Qinba Mountain area, Shaanxi, China. A comprehensive evaluation of toxigenic capability of 26 isolates were conducted using Ultra Performance Liquid Chromatography for determination of bongkrekic acid and toxoflavin production in different culturing conditions and foods. The isolates produced bongkrekic acid in the range of 0.05-6.24 mg/L in black fungus and a highly toxin-producing strain generated 201.86 mg/L bongkrekic acid and 45.26 mg/L toxoflavin in co-cultivation with Rhizopus oryzae on PDA medium. Multilocus sequence typing phylogeny (MLST) analysis showed that housekeeping gene sequences have a certain relationship with a strain toxigenic phenotype. We developed a well-trained, back-propagation neutral network for prediction of toxigenic phenotype in B. gladioli based on MLST sequences with an accuracy of 100% in the training set and an accuracy of 86.7% in external test set strains. The BP neutral network offers a highly efficient approach to predict toxigenic phenotype of strains and contributes to hazard detection and safety surveillance.
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Affiliation(s)
- Chen Niu
- College of Food Science and Technology, Northwest University, Xi’an 710069, China; (C.N.); (X.S.); (J.H.); (Y.Y.)
| | - Xiying Song
- College of Food Science and Technology, Northwest University, Xi’an 710069, China; (C.N.); (X.S.); (J.H.); (Y.Y.)
| | - Jin Hao
- College of Food Science and Technology, Northwest University, Xi’an 710069, China; (C.N.); (X.S.); (J.H.); (Y.Y.)
| | - Mincheng Zhao
- The 20th Research Institute of CETC, Xi’an 710068, China
| | - Yahong Yuan
- College of Food Science and Technology, Northwest University, Xi’an 710069, China; (C.N.); (X.S.); (J.H.); (Y.Y.)
| | - Jingyan Liu
- College of Food Science and Technology, Northwest University, Xi’an 710069, China; (C.N.); (X.S.); (J.H.); (Y.Y.)
| | - Tianli Yue
- College of Food Science and Technology, Northwest University, Xi’an 710069, China; (C.N.); (X.S.); (J.H.); (Y.Y.)
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11
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Luo J, Luo Y, Cheng X, Liu X, Wang F, Fang F, Cao J, Liu W, Xu R. Prediction of biological nutrients removal in full-scale wastewater treatment plants using H 2O automated machine learning and back propagation artificial neural network model: Optimization and comparison. BIORESOURCE TECHNOLOGY 2023; 390:129842. [PMID: 37820968 DOI: 10.1016/j.biortech.2023.129842] [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: 07/26/2023] [Revised: 10/02/2023] [Accepted: 10/05/2023] [Indexed: 10/13/2023]
Abstract
The effective control of total nitrogen (ETN) and total phosphorus (ETP) in effluent is challenging for wastewater treatment plants (WWTPs). In this work, automated machine learning (AutoML) (mean square error = 0.4200 ∼ 3.8245, R2 = 0.5699 ∼ 0.6219) and back propagation artificial neural network (BPANN) model (mean square error = 0.0012 ∼ 6.9067, R2 = 0.4326 ∼ 0.8908) were used to predict and analyze biological nutrients removal in full-scale WWTPs. Interestingly, BPANN model presented high prediction performance and general applicability for WWTPs with different biological treatment units. However, the AutoML candidate models were more interpretable, and the results showed that electricity carbon emission dominated the prediction. Meanwhile, increasing data volume and types of WWTP hardly affected the interpretable results, demonstrating its wide applicability. This study demonstrated the validity and the specific advantages of predicting ETN and ETP using H2O AutoML and BPANN model, which provided guidance on the prediction and improvement of biological nutrients removal in WWTPs.
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Affiliation(s)
- Jingyang Luo
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Yuting Luo
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Xiaoshi Cheng
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Xinyi Liu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Feng Wang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Fang Fang
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Jiashun Cao
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China
| | - Weijing Liu
- Jiangsu Provincial Key Laboratory of Environment Engineering, Jiangsu Provincial Academy of Environmental Science, Nanjing 210036, China
| | - Runze Xu
- Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Ministry of Education, Hohai University, 1 Xikang Road, Nanjing 210098, China; College of Environment, Hohai University, 1 Xikang Road, Nanjing 210098, China.
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12
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Gao H, Chen B, Qaisar M, Lou J, Sun Y, Cai J. Machine learning-based model construction and identification of dominant factor for simultaneous sulfide and nitrate removal process. BIORESOURCE TECHNOLOGY 2023; 390:129848. [PMID: 37832854 DOI: 10.1016/j.biortech.2023.129848] [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: 07/14/2023] [Revised: 09/23/2023] [Accepted: 10/05/2023] [Indexed: 10/15/2023]
Abstract
Accurate water quality prediction models are essential for the successful implementation of the simultaneous sulfide and nitrate removal process (SSNR). Traditional models, such as regression and analysis of variance, do not provide accurate predictions due to the complexity of microbial metabolic pathways. In contrast, Back Propagation Neural Networks (BPNN) has emerged as superior tool for simulating wastewater treatment processes. In this study, a generalized BPNN model was developed to simulate and predict sulfide removal, nitrate removal, element sulfur production, and nitrogen gas production in SSNR. Remarkable results were obtained, indicating the strong predictive performance of the model and its superiority over traditional mathematical models for accurately predicting the effluent quality. Furthermore, this study also identified the crucial influencing factors for the process optimization and control. By incorporating artificial intelligence into wastewater treatment modeling, the study highlights the potential to significantly enhance the efficiency and effectiveness of meeting water quality standards.
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Affiliation(s)
- Hong Gao
- College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China
| | - Bilong Chen
- College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China
| | - Mahmood Qaisar
- Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, Pakistan; Department of Biology, College of Science, University of Bahrain, Sakhir 32038, Bahrain
| | - Juqing Lou
- College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China
| | - Yue Sun
- College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China
| | - Jing Cai
- College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China; International Science and Technology Cooperation Platform for Low-Carbon Recycling of Waste and Green Development, Zhejiang Gongshang University, Hangzhou, China.
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13
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Yang B, Li J, Wang J. Optimization of catalytic wet air oxidation process in microchannel reactor for TBBS wastewater treatment. ENVIRONMENTAL TECHNOLOGY 2023:1-9. [PMID: 37955604 DOI: 10.1080/09593330.2023.2283802] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2023] [Accepted: 10/14/2023] [Indexed: 11/14/2023]
Abstract
Catalytic wet air oxidation (CWAO) process is employed for the treatment of N-tert-butyl-2-benzothiazolesulfenamide (TBBS) wastewater in a microchannel reactor that enables continuous operation of the reaction and allows for thorough mixing of oxygen and pollutants. To achieve the optimal process performance, four key parameters of pressure, temperature, time, and the mass ratio of input oxygen to wastewater COD are optimized using both response surface methodology (RSM) and backpropagation artificial neural network (BP-ANN). According to the correlation coefficients of model results and experimental data, BP-ANN performs better than RSM in simulation and prediction. The analysis of variance in RSM shows that all parameters are significant for the obtained quadratic model, but their interactions with each other are not significant. Connection weights algorithm is used to determine the relative importance of these parameters for the process efficiency, and it is demonstrated that temperature is the most influential parameter with a relative importance of 35.61%, followed by pressure (29.74%), time (19.53%) and ROC (15.12%).
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Affiliation(s)
- Bo Yang
- Capital Construction Office, Changzhou University, Changzhou, People's Republic of China
| | - Jiankang Li
- School of Environmental Science and Engineering, Changzhou University, Changzhou, People's Republic of China
| | - Jipeng Wang
- School of Environmental Science and Engineering, Changzhou University, Changzhou, People's Republic of China
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14
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Ma X, Yu T, Guan DX, Li C, Li B, Liu X, Lin K, Li X, Wang L, Yang Z. Prediction of cadmium contents in rice grains from Quaternary sediment-distributed farmland using field investigations and machine learning. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 898:165482. [PMID: 37467982 DOI: 10.1016/j.scitotenv.2023.165482] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 06/21/2023] [Accepted: 07/10/2023] [Indexed: 07/21/2023]
Abstract
The Quaternary sediment-distributed regions of South China are suitable for rice cultivation, which is crucial for ensuring food security. Spatial correlations between soil cadmium (Cd) and rice Cd contents are generally poor, making the evaluation of rice quality and associated health risks challenging. In this study, we developed machine learning algorithms for predicting rice Cd contents using 654 data pairs of soil-rice samples collected in Guangxi province, China. After a comprehensive comparison, our results showed that the random forest (RF) had the better performance than artificial neural network (ANN) based on all the data (RMSEtesting 0.066 vs. 0.099 and R2testing 0.860 vs. 0.688). The feature importance analysis showed that soil CaO, Cd, elevation, and rainfall were the four most important features affecting the rice Cd contents in the study area. Using the established RF-predicated model, the rice Cd contents were predicted at the provincial level with an additional dataset of 1176 paddy soil samples. The prediction result revealed about 23 % of farmland cultivated rice with Cd content over 0.2 mg kg-1 in the study area. Therefore, it is recommended to implement strict measures by local agricultural departments to reduce rice Cd contents and ensure food safety in these areas. Our study provides valuable insights into the prediction of rice Cd contents, thus contributing to ensuring food safety and preventing Cd exposure-associated health risks.
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Affiliation(s)
- Xudong Ma
- School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
| | - Tao Yu
- School of Science, China University of Geosciences, Beijing 100083, PR China; Key Laboratory of Ecological Geochemistry, Ministry of Natural Resources, Beijing 100037, PR China
| | - Dong-Xing Guan
- College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, PR China
| | - Cheng Li
- School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
| | - Bo Li
- School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
| | - Xu Liu
- School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
| | - Kun Lin
- School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
| | - Xuezhen Li
- School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
| | - Lei Wang
- Guangxi Bureau of Geology & Mineral Prospecting & Exploitation, Nanning 530023, PR China
| | - Zhongfang Yang
- School of Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China; Key Laboratory of Ecological Geochemistry, Ministry of Natural Resources, Beijing 100037, PR China.
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15
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Jang D, Won J, Jo Y, Kim Y, Jang A. The effect of biocarriers on the nitrification and microbial community in moving bed biofilm reactor for anaerobic digestion effluent treatment. ENVIRONMENTAL RESEARCH 2023:116350. [PMID: 37290619 DOI: 10.1016/j.envres.2023.116350] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 06/02/2023] [Accepted: 06/06/2023] [Indexed: 06/10/2023]
Abstract
The performance of a moving bed biofilm reactor (MBBR) depends largely on the type of biofilm carrier used. However, how different carriers affect the nitrification process, particularly when treating anaerobic digestion effluents, is not completely understood. This study aimed to evaluate the nitrification performance of two distinct biocarriers in MBBRs over a 140-d operation period, with a gradually decreasing hydraulic retention time (HRT) from 20 to 10 d. Reactor 1 (R1) was filled with fiber balls, whereas a Mutag Biochip was used for reactor 2 (R2). At an HRT of 20 d, the ammonia removal efficiency of both reactors was >95%. However, as the HRT was reduced, the ammonia removal efficiency of R1 gradually declined, ultimately dropping to 65% at a 10-d HRT. In contrast, the ammonia removal efficiency of R2 consistently exceeding 99% throughout the long-term operation. R1 exhibited partial nitrification, whereas R2 exhibited complete nitrification. Analysis of microbial communities showed that the abundance and diversity of bacterial communities, particularly nitrifying bacteria such as Hyphomicrobium sp. And Nitrosomonas sp., in R2 was higher than that in R1. In conclusion, the choice of biocarrier significantly impact the abundance and diversity of microbial communities in MBBR systems. Therefore, these factors should be closely monitored to ensure the efficient treatment of high-strength ammonia wastewater.
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Affiliation(s)
- Duksoo Jang
- Department of Global Smart City, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Jongyeob Won
- Department of Global Smart City, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419, Republic of Korea
| | - Yeadam Jo
- R&D Division, Hyundai Engineering & Construction Co., Yongin, Gyeonggi-do, South Korea
| | - Youngoh Kim
- R&D Division, Hyundai Engineering & Construction Co., Yongin, Gyeonggi-do, South Korea
| | - Am Jang
- Department of Global Smart City, Sungkyunkwan University (SKKU), 2066 Seobu-ro, Jangan-gu, Suwon, Gyeonggi-do, 16419, Republic of Korea.
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16
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Li B, Lu C, Zhao J, Tian J, Sun J, Hu C. Operational parameter prediction of electrocoagulation system in a rural decentralized water treatment plant by interpretable machine learning model. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 333:117416. [PMID: 36758403 DOI: 10.1016/j.jenvman.2023.117416] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2022] [Revised: 01/21/2023] [Accepted: 01/28/2023] [Indexed: 06/18/2023]
Abstract
Electrocoagulation (EC) is a promising alternative for decentralized drinking water treatment in rural areas as a chemical-free technology. However, seasonal fluctuations of water quality in influent remain a significant challenge for rural decentralized water supply, which was a potential threat to water safety. The frequent operation was required to ensure the effluent water quality by the experienced technicians, who were in shortage in rural areas. If the operational parameters prediction model based on water quality could be established, it might reduce the dependence on technicians. Therefore, an artificial neural network (ANN) model combined with genetic algorithm (GA) was used to establish a prediction model for unattended intelligent operation. Data on water quality and operational parameters were collected from a practical EC system in a decentralized water treatment plant. Seven water quality parameters (e.g., turbidity, temperature, pH and conductivity) were selected as input variables and the operational current was employed as the output. A non-linear relationship between water quality parameters and the operational current was verified by correlation analysis and principal component analysis (PCA). The mean squared error (MSE) and coefficient of determination (R2) were used as evaluation indexes to optimize the structure of the GA-ANN model. Influent turbidity was identified to be crucial in the GA-ANN model by model interpretation using sensitivity analysis and scenario analysis. The Garson weight of turbidity in the seven input variables achieved 45.4%. The predictive accuracy of the GA-ANN model sharply declined from 90% to 67.1% when influent turbidity data were absent. In addition, it was estimated that energy consumption savings of the GA-ANN method declined by 14.2% in comparison with the gradient control method. This study verifies the feasibility and stability of machine learning strategy for unattended operation in the rural decentralized water treatment plant.
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Affiliation(s)
- Bowen Li
- Hebei University of Technology, Tianjin 300131, China; State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Chaojie Lu
- 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
| | - Jin Zhao
- School of Mathematics & Statistics and National Engineering Laboratory for Big Data Analysis, Xi'an Jiaotong University, Xi'an 710049, China
| | - Jiayu Tian
- Hebei University of Technology, Tianjin 300131, China.
| | - Jingqiu Sun
- 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.
| | - Chengzhi Hu
- 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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17
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Liu K, Lin T, Zhong T, Ge X, Jiang F, Zhang X. New methods based on a genetic algorithm back propagation (GABP) neural network and general regression neural network (GRNN) for predicting the occurrence of trihalomethanes in tap water. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 870:161976. [PMID: 36740065 DOI: 10.1016/j.scitotenv.2023.161976] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Revised: 01/25/2023] [Accepted: 01/29/2023] [Indexed: 06/18/2023]
Abstract
Monitoring trihalomethanes (THMs) levels in water supply systems is of great significance in ensuring drinking water safety. However, THMs detection is a time-consuming task. Developing predictive THMs models using parameters that are easier to obtain is an alternative. To date, there is still no application of optimization algorithms and general regression neural networks in predicting disinfection by-products levels. This study was to explore the feasibility of back propagation neural network (BPNN), genetic algorithm back propagation (GABP) neural network and general regression neural network (GRNN) for predicting THMs occurrence in real water supply systems. The results showed that the BPNN models' prediction ability was limited (test rp = 0.571-0.857, N25 = 61.5 %-91.5 %). Optimized by the genetic algorithm (GA), GABP models were generated and exhibited better prediction performance (test rp = 0.573 and 0.696-0.863, N25 = 68.2 %-93.6 %). However, GABP models took a lot of time and their prediction performance was unstable. A GRNN was then used to generate simpler neural network models, and the resulting prediction performance was excellent (total trihalomethanes and bromodichloromethane: test rp = 0.657-0.824, N25 = 81.8 %-100 %). In general, GRNN was the best at predicting THMs concentrations among the three models. However, it is worth noting that the prediction accuracy of bromodichloromethane (BDCM) was not high, which may be due to the absence of key parameters affecting BDCM formation. Accurate predictions of THMs by GRNN with these nine water parameters made THMs monitoring in real water supply systems possible and practical.
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Affiliation(s)
- Kangle Liu
- Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, PR China; College of Environment, Hohai University, Nanjing 210098, PR China
| | - Tao Lin
- Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, PR China; College of Environment, Hohai University, Nanjing 210098, PR China.
| | - Tingting Zhong
- Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, PR China; College of Environment, Hohai University, Nanjing 210098, PR China
| | - Xinran Ge
- Ministry of Education Key Laboratory of Integrated Regulation and Resource Development on Shallow Lakes, Hohai University, Nanjing 210098, PR China; College of Environment, Hohai University, Nanjing 210098, PR China
| | - Fuchun Jiang
- Suzhou Water Supply Company, Suzhou 215002, PR China
| | - Xue Zhang
- Suzhou Water Supply Company, Suzhou 215002, PR China
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18
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Saidulu D, Srivastava A, Gupta AK. Elucidating the performance of integrated anoxic/oxic moving bed biofilm reactor: Assessment of organics and nutrients removal and optimization using feed forward back propagation neural network. BIORESOURCE TECHNOLOGY 2023; 371:128641. [PMID: 36681347 DOI: 10.1016/j.biortech.2023.128641] [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: 12/04/2022] [Revised: 01/12/2023] [Accepted: 01/15/2023] [Indexed: 06/17/2023]
Abstract
A lab-scale integrated anoxic and oxic (A/O) moving bed biofilm reactor (MBBR) was investigated for the removal of organics and nutrients by varying chemical oxygen demand (COD) to NH4-N ratio (C/N ratio: 3.5, 6.75, and 10), hydraulic retention time (HRT: 6 h, 15 h, and 24 h), and recirculation ratio (R: 1, 2, and 3). The use of activated carbon coated carriers prepared from waste polyethylene material and polyurethane sponges attached to a cylindrical frame in the integrated A/O MBBR increased the attached growth biomass significantly. >95 % of COD removal was observed under the C/N ratio of 10 at an HRT of 24 h. While the low C/N ratio favored the removal of NH4-N (∼98 %) and PO43--P (∼90 %) with an optimal R of 1.75. Using the experimental dataset, to predict and forecast the performance of integrated A/O MBBR, a feed-forward-backpropagation-neural-network model was developed.
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Affiliation(s)
- Duduku Saidulu
- Environmental Engineering Division, Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Ashish Srivastava
- School of Environmental Science and Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India
| | - Ashok Kumar Gupta
- Environmental Engineering Division, Department of Civil Engineering, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
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19
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Li B, Shen L, Zhao Y, Yu W, Lin H, Chen C, Li Y, Zeng Q. Quantification of interfacial interaction related with adhesive membrane fouling by genetic algorithm back propagation (GABP) neural network. J Colloid Interface Sci 2023; 640:110-120. [PMID: 36842417 DOI: 10.1016/j.jcis.2023.02.030] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2023] [Revised: 01/28/2023] [Accepted: 02/07/2023] [Indexed: 02/11/2023]
Abstract
Since adhesive membrane fouling is critically determined by the interfacial interaction between a foulant and a rough membrane surface, efficient quantification of the interfacial interaction is critically important for adhesive membrane fouling mitigation. As a current available method, the advanced extended Derjaguin-Landau-Verwey-Overbeek (XDLVO) theory involves complicated rigorous thermodynamic equations and massive amounts of computation, restricting its application. To solve this problem, artificial intelligence (AI) visualization technology was used to analyze the existing literature, and the genetic algorithm back propagation (GABP) artificial neural network (ANN) was employed to simplify thermodynamic calculation. The results showed that GABP ANN with 5 neurons could obtain reliable prediction performance in seconds, versus several hours or even days time-consuming by the advanced XDLVO theory. Moreover, the regression coefficient (R) of GABP reached 0.9999, and the error between the prediction results and the simulation results was less than 0.01%, indicating feasibility of the GABP ANN technique for quantification of interfacial interaction related with adhesive membrane fouling. This work provided a novel strategy to efficiently optimize the thermodynamic prediction of adhesive membrane fouling, beneficial for better understanding and control of adhesive membrane fouling.
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Affiliation(s)
- Bowen Li
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Liguo Shen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Ying Zhao
- Teachers' Colleges, Beijing Union University, 5 Waiguanxiejie Street, Chaoyang District, Beijing 100011, China.
| | - Wei Yu
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Hongjun Lin
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Cheng Chen
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Yingbo Li
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
| | - Qianqian Zeng
- College of Geography and Environmental Sciences, Zhejiang Normal University, Jinhua 321004, China.
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