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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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Wu J, Bian J, Sun X. Comparative assessment on ammonia nitrogen adsorption onto a saline soil-groundwater environment: distribution, multi-factor interaction, and optimization using response surface methodology and artificial neural network. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2023; 45:3743-3758. [PMID: 36508045 DOI: 10.1007/s10653-022-01446-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2022] [Accepted: 11/29/2022] [Indexed: 06/01/2023]
Abstract
The adsorption of soil can reduce the leaching of NH4+-N from the external environment into groundwater. The adsorption of NH4+-N is affected by many factors. It is critical to use statistical model to quantitatively describe the effects of interaction between two or more factors on the system response. In this study, HJ-Biplot was used to analyze the correlation characteristics of soil water, salt, and nitrogen, and the response surface methodology and artificial neural network were used to statistically visualize the interaction between factors, including concentration, total dissolved solids (TDS), temperature, and pH. The results showed that the study soil was a typical saline soil, with maximum soil NH4+-N content of 85.45 mg/kg. For the adsorption experiments of NH4+-N on saline soils, the effects of factors on the adsorption capacity were assessed using the RSM model. The RSM model was coupled with an ANN to predict the adsorption of NH4+-N by saline soils. The NH4+-N concentration and water pH were both significant at a linear level (p < 0.0001). The interaction between NH4+-N concentration and pH was also more significant (p < 0.01). Under optimal conditions (concentration: 800 mg/L; temperature: 24 °C; TDS: 637 mg/L; pH: 7.83), the NH4+-N adsorption capacity was 1650.2 ug/g, which was in general agreement with the calculated values from the Box-Behnken and RSM model. In addition, a statistical error criterion for the model showed that the RSM-ANN model had greater predictive ability than RSM model.
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Affiliation(s)
- Juanjuan Wu
- Key Laboratory of Groundwater Resources and Environment (Jilin University), Ministry of Education, Jilin University, Changchun, 130021, People's Republic of China
- Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130021, People's Republic of China
| | - Jianmin Bian
- Key Laboratory of Groundwater Resources and Environment (Jilin University), Ministry of Education, Jilin University, Changchun, 130021, People's Republic of China.
- Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130021, People's Republic of China.
| | - Xiaoqing Sun
- Key Laboratory of Groundwater Resources and Environment (Jilin University), Ministry of Education, Jilin University, Changchun, 130021, People's Republic of China
- Jilin Provincial Key Laboratory of Water Resources and Environment, College of New Energy and Environment, Jilin University, Changchun, 130021, People's Republic of China
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Degradation of benzene in anaerobic groundwater in the typical cold industrial region: Identification, interactions, and optimization of nitrate-/sulfate-reducing assemblages. Biochem Eng J 2023. [DOI: 10.1016/j.bej.2023.108833] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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Enhancing Real-Time Prediction of Effluent Water Quality of Wastewater Treatment Plant Based on Improved Feedforward Neural Network Coupled with Optimization Algorithm. WATER 2022. [DOI: 10.3390/w14071053] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
To provide real-time prediction of wastewater treatment plant (WWTP) effluent water quality, a machine learning (ML) model was developed by combining an improved feedforward neural network (IFFNN) with an optimization algorithm. Data used as input variables of the IFFNN included hourly influent water quality parameters, influent flow rate and WWTP process monitoring and operational parameters. Additionally, input variables included historical effluent water quality parameters for future prediction. The model was demonstrated in a WWTP in Jiangsu Province, China, where prediction of effluent chemical oxygen demand (COD) and total nitrogen (TN) with large variations were tested. Relative to the traditional feedforward neural network (FFNN) model without considering historical effluent water quality parameter input, the IFFNN enhanced prediction performance by 52.3% (COD) and 72.6% (TN) based on the mean absolute percentage errors of test datasets, after its model structure was optimized with a genetic algorithm (GA). The problem of over-fitting could also be overcome through the use of the IFFNN, with the determination of coefficient increased from 0.20 to 0.76 for test datasets of effluent COD. The GA-IFFNN model, which was efficient in capturing complex non-linear relationships and extrapolation, could be a useful tool for real-time direction of regulatory changes in WWTP operations.
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Zhu T, Chen W, Jafvert CT, Fu D, Cheng H, Chen M, Wang Y. Development of novel experimental and modelled low density polyethylene (LDPE)-water partition coefficients for a range of hydrophobic organic compounds. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 291:118223. [PMID: 34583266 DOI: 10.1016/j.envpol.2021.118223] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 09/17/2021] [Accepted: 09/21/2021] [Indexed: 06/13/2023]
Abstract
Knowledge about partitioning constants of hydrophobic organic compounds (HOCs) between the polymer and aqueous phases is critical for assessing chemical environmental fate and transport. The conventional experimental method is characterized by large discrepancies in the measured values due to the limited water solubility of HOCs and other associated issues. In the current work, a novel three-phase partitioning system was evaluated to determine accurate low-density polyethylene (LDPE)-water partition coefficients (KPE-w). By adding sufficient surfactant (Brij 30) to form the micellar pseudo-phase within the polymer/water system, the KPE-w values were obtained from a combination of two experimentally measured values, that is, the micelle-water partition coefficient (Kmic-w) and the LDPE-micelle partition coefficient (KPE-mic). The method presented here is capable of shortening the equilibration time to half a month, and avoiding defects of the traditional method with respect to directly measured aqueous phase concentrations. Herein, the KPE-w values were determined for HOCs with little errors. Meanwhile, based on the 120 experimental KPE-w data, several in silico models were also developed as valid extrapolation tools to estimate missing or uncertain values. Analysis of the underlying solubility interactions in the nonionic surfactant micelles were investigated, providing additional support for the reliability of the proposed method.
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Affiliation(s)
- Tengyi Zhu
- School of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, Jiangsu, China.
| | - Wenxuan Chen
- School of Civil Engineering, Southeast University, Nanjing, 210096, China
| | - Chad T Jafvert
- Lyles School of Civil Engineering, and Environmental & Ecological Engineering, Purdue University, West Lafayette, IN, 47907, USA
| | - Dafang Fu
- School of Civil Engineering, Southeast University, Nanjing, 210096, China
| | - Haomiao Cheng
- School of Environmental Science and Engineering, Yangzhou University, Yangzhou, 225127, Jiangsu, China
| | - Ming Chen
- School of Civil Engineering, Southeast University, Nanjing, 210096, China
| | - Yajun Wang
- School of Civil Engineering, Lanzhou University of Technology, 287 Langongping, Lanzhou, 730050, China
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Yokota N, Mineshima R, Watanabe Y, Tokutomi T, Kiyokawa T, Nishiyama T, Fujii T, Furukawa K. Startup of pilot-scale single-stage nitrogen removal using anammox and partial nitritation (SNAP) reactor for waste brine treatment using marine anammox bacteria. J Biosci Bioeng 2021; 132:505-512. [PMID: 34420896 DOI: 10.1016/j.jbiosc.2021.06.013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Revised: 05/17/2021] [Accepted: 06/29/2021] [Indexed: 11/19/2022]
Abstract
This study is the first to demonstrate the startup of a pilot-scale single-stage nitrogen removal using anammox and partial nitritation (SNAP) reactor utilizing marine anammox bacteria. A complete mixing type reactor, continuously fed with waste brine obtained from a natural gas plant (salinity 3%, NH4+-N 130-180 mg/L) and having an effective volume of 2 m3, achieved stable operation at temperatures of 20-30°C with a maximum nitrogen removal rate of 1.43 kg-N/m3/day. During the startup process, along with a small amount of seed sludge, granular sludge was additionally inoculated as a biomass carrier for the enrichment of ammonia oxidizing bacteria (AOB), followed by the enrichment of anammox bacteria. A mesh screen equipped at the outlet of the reactor facilitated the successful sludge retention in the reactor. Analysis of bacterial community composition indicated that Candidatus Scalindua was successfully enriched in the pilot SNAP reactor. These methods for stable sludge retention in the reactor greatly contributed to the startup of the first pilot-scale SNAP reactor using marine anammox bacteria.
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Affiliation(s)
- Nobuyuki Yokota
- Kanto Natural Gas Development Co., Ltd., 661 Mobara, Mobara, Chiba 297-8550, Japan.
| | - Ryota Mineshima
- Kanto Natural Gas Development Co., Ltd., 661 Mobara, Mobara, Chiba 297-8550, Japan
| | - Yasutsugu Watanabe
- Kanto Natural Gas Development Co., Ltd., 661 Mobara, Mobara, Chiba 297-8550, Japan
| | - Takaaki Tokutomi
- Kurita Water Industries, Ltd., 1-1 Kawada, Nogi-Machi, Shimotsuga-Gun, Tochigi 329-0105, Japan
| | - Tomohiro Kiyokawa
- Kurita Water Industries, Ltd., 1-1 Kawada, Nogi-Machi, Shimotsuga-Gun, Tochigi 329-0105, Japan
| | - Takashi Nishiyama
- Department of Applied Life Science, Faculty of Biotechnology and Life Science, Sojo University, 4-22-1 Ikeda, Kumamoto 860-0082, Japan
| | - Takao Fujii
- Department of Applied Life Science, Faculty of Biotechnology and Life Science, Sojo University, 4-22-1 Ikeda, Kumamoto 860-0082, Japan
| | - Kenji Furukawa
- Department of Civil and Environmental Engineering, Kumamoto University, 2-39-1 Kurokami, Kumamoto 860-8555, Japan
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Chen Q, Wang J, Zhang H, Shi H, Liu G, Che J, Liu B. Microbial community and function in nitrogen transformation of ectopic fermentation bed system for pig manure composting. BIORESOURCE TECHNOLOGY 2021; 319:124155. [PMID: 33035862 DOI: 10.1016/j.biortech.2020.124155] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2020] [Revised: 09/14/2020] [Accepted: 09/17/2020] [Indexed: 06/11/2023]
Abstract
In this work, agricultural wastes were treated by composting in an ectopic fermentation bed system (EFBS) with a continuous nitrogen addition technique. With decreasing of NH4+-N concentration and increasing of NO3--N concentration were observed, and activities of protease, urease and nitrate reductase changed significantly during the fermentation process. To elucidate the key microbes and their function in nitrogen-transforming, microbial diversity and clusters of orthologous groups (COGs) in composting materials were evaluated using metagenomic technology. Comparing with ammonification, the COGs involved in nitrification and denitrification were predominant in the composts. The correlation heatmap revealed that Streptomyces predominant in ammonification was significantly affected by contents of N, NH4+-N and NO3--N. Meanwhile, ammonia-oxidizing archaea (AOA) had a positive relationship with moisture. The most abundant genera in denitrification had positive relationships with N and NO3--N. The results indicated that EFBS had functionally diverse microbes and COGs for NH3 removal.
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Affiliation(s)
- Qianqian Chen
- Agricultural Bio-resource Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou 350003, China
| | - Jieping Wang
- Agricultural Bio-resource Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou 350003, China.
| | - Haifeng Zhang
- Agricultural Bio-resource Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou 350003, China
| | - Huai Shi
- Agricultural Bio-resource Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou 350003, China
| | - Guohong Liu
- Agricultural Bio-resource Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou 350003, China
| | - Jianmei Che
- Agricultural Bio-resource Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou 350003, China
| | - Bo Liu
- Agricultural Bio-resource Research Institute, Fujian Academy of Agriculture Sciences, Fuzhou 350003, China
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Zhang D, Xu S, Antwi P, Xiao L, Luo W, Liu Z, Li J, Su H, Lai C, Ayivi F. Accelerated start-up, long-term performance and microbial community shifts within a novel upflow porous-plated anaerobic reactor treating nitrogen-rich wastewater via ANAMMOX process. RSC Adv 2019; 9:26263-26275. [PMID: 35530984 PMCID: PMC9070342 DOI: 10.1039/c9ra04225c] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2019] [Accepted: 08/12/2019] [Indexed: 11/21/2022] Open
Abstract
Schematic diagram of the upflow porous-plate anaerobic reactor and nitrogen removal pathways occurring within the reactor.
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