Removing refractory organic substances from landfill leachate using a nanofiltration membrane bioreactor: Performance and mechanisms

被引:19
作者
Zhou, Chu [1 ]
Li, Na [1 ]
Guo, Wenbin [1 ]
Wang, Rui [2 ]
Yan, Yaohua [3 ]
Shao, Senlin [1 ]
机构
[1] Wuhan Univ, Sch Civil Engn, Wuhan 430072, Peoples R China
[2] Hubei Univ, Fac Resources & Environm Sci, Wuhan 430062, Peoples R China
[3] Beijing Univ Technol, Coll Architecture & Civil Engn, Beijing 100124, Peoples R China
基金
中国国家自然科学基金;
关键词
Landfill leachate; Membrane bioreactor; Nanofiltration; Organic retention time; Refractory organic substances; HYDRAULIC RETENTION TIME; WASTE-WATER; NF-MBR; TECHNOLOGIES; DEGRADATION; CONCENTRATE;
D O I
10.1016/j.cej.2024.149704
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Membrane bioreactors (MBRs) are typically used to dispose landfill leachate, but they are challenged by the low removal of refractory organic substances. To address this challenge, in this study, we replaced the commonly used microfiltration (MF) membranes in conventional MBRs with nanofiltration (NF) membranes, i.e., MBRNF. We operated a one-step MBRNF for 127 days and benchmarked against a conventional MBRMF in terms of membrane fouling, pollutants removal, and bulk solution properties. The results showed that the NF membrane could effectively reject refractory organic substances, leading to a longer organic retention time (ORT) and a higher concentration of refractory organic substances in the bioreactor. Consequently, the MBRNF outperformed MBRMF by 20 %-30 % in removing of refractory organic substances, mainly by the enhanced biodegradation of refractory organic substances with low molecular weight. Further investigation suggested that the enhanced biodegradation in the MBRNF could be ascribed to 1) more biomass in the bioreactor; 2) higher concentration of refractory organic substances in the bioreactor; and 3) the enrichment of dominant bacteria such as Chloroflexi. These findings highlight the potential of MBRNF in removing refractory organic substances from landfill leachate and other wastewaters with poor biodegradability.
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页数:9
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