Increasing methane production in an anaerobic membrane bioreactor for treating landfill leachate: Impact of organic concentration and HRT.

Autor: Xiao J; College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China., Qaisar M; Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad, Campus, Pakistan; Department of Biology, College of Science, University of Bahrain, Sakhir, 32038, Bahrain., Zhu X; College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China., Li W; College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China., Zhang K; College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China., Liang N; College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China., Feng H; College of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou, China., Cai J; 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. Electronic address: caijing@zjgsu.edu.cn.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2024 Sep; Vol. 367, pp. 122061. Date of Electronic Publication: 2024 Aug 03.
DOI: 10.1016/j.jenvman.2024.122061
Abstrakt: The anaerobic biological treatment of landfill leachate frequently encounters the souring problems because of the high concentration of organic in landfill leachate. Nonetheless, the performance of anaerobic membrane bioreactor (AnMBR) is commendable in terms of removal of organic compounds. Hence, this study explored the effect of organic concentration and hydraulic retention time(HRT) on the removal performance of actual landfill leachate, additionally, carbon conversion through carbon mass balance analysis was analyzed, in order to determine the optimal treatment potential of AnMBR in treating landfill leachate. For HRT values between 14.5 h and 34.6 h, and the influent COD (Chemical Oxygen Demand) range of 12,773.33-15706.67 mg/L, AnMBR could efficiently treat landfill leachate. As HRT was fixed at 14.5 h and influent COD was around 12,206.7-15,373.33 mg/L, AnMBR achieved a maximum organic removal rate of 18.22 ± 0.51 kg COD/(m 3 ∙d) with methane yield of 0.24 ± 0.01 m 3 CH 4 /kg COD and methane content of 88.26%. Based on carbon mass balance, increasing COD concentration in the influent (less than 16,000 mg/L) boosted the conversion of organic compounds (45.19 ± 4.24%) into CH 4 ; while decreasing HRT (more than 27.0 h) also promoted the conversion of organic compounds into CH 4 (38.36-60.93%) resulting in a decreased TOC (Total Organic Carbon) loss by 2.02-7.19% with outflow. AnMBR may efficiently produce methane while treating landfill leachate by assessing the random forest model (RF) and adjusting the balance between HRT and influent COD concentration.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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