College of Environmental and Ecology, Chongqing University
Key Laboratory of the Three Gorges Reservoir Region′s Eco-Environment, Ministryof Education, Chongqing University

为研究二级膜生物膜反应器(MBfR)在处理垃圾渗滤液协同垃圾填埋气脱硫脱碳提纯方面的效能与机制,依次考察了前置短程硝化 MBfR 和后置 MBfR 运行过程中有机物和氮素污染物的去除效能,以及垃圾填埋气中 H2S、CO2 和 CH4 的转化特性。 实验结果表明:在反应系统运行 280 d后,成功实现了渗滤液深度处理协同填埋气高效脱硫脱碳。 通过控制前置反应器低溶氧,亚硝化率可达 85%以上,可实现短程硝化和 DAMO-Anammox 过程的耦合。 系统对 COD、NH+4 和 TN 的平均去除率分别可达 95%、99%和 99%,可实现垃圾渗滤液高效减碳脱氮;垃圾填埋气经过净化后的 CO2和 H2S 气体成分分别降低至 0.2%以下和 5%左右,而 CH4气体成分提高至 80%左右,显著提升了垃圾填埋气的质量。 反硝化型厌氧甲烷氧化古菌和产甲烷古菌在电子转移系统中表现出高活跃性,暗示其通过直接电子转移的种间关系,可强化 CO2还原产 CH4过程。 本研究中,高效的填埋气升级效果一方面归功于富集了电活性产甲烷菌 Methanothrix 和硫自养反硝化细菌Thiobacillus;另一方面,高有机负荷的厌氧产甲烷过程消耗大量质子,从而提高体系碱性并增加液相中可吸收的 CO2量。 这进一步促进了垃圾填埋气中 CO2含量减少和 CH4含量增加。

To investigate the efficiency and mechanism of treating landfill leachate by two-stage mem⁃brane biofilm reactor (MBfR) in cooperation with desulfurization and decarbonization of landfill gas,we sequentially examined the removal efficiency of organic matter and nitrogen pollutants, as well asthe conversion characteristics of H2S, CO2, and CH4 in landfill gas during the operation of pre-shortrange nitrification MBfR and post - MBfR. After 280 days of operation, experimental resultsdemonstrated that the reaction system successfully achieved high-efficiency desulfurization and decar⁃burization for advanced treatment of leachate along with upgrading landfill gas. By controlling low dis⁃solved oxygen levels in the pre-reactor, nitrosation rates exceeding 85% were achieved while enablingpartial nitrification coupled DAMO-Anammox process. The average removal rates for COD, NH+4, andTN reached 95%, 99%, and 99% respectively, thereby achieving efficient carbon and nitrogen reduc⁃tion for landfill leachate. Following landfill gas purification processes, CO2 content was reduced to lessthan 0.2%, and H2S content decreased to approximately 5%, while CH4 content increased to around80%. This significant upgrade in landfill gas can be attributed to highly active denitrifying anaerobicmethanogenic archaea species within the electron transfer system which enhance CO2 -reducing CH4production through direct electron transfer between species. Furthermore, this study highlights how effi⁃cient landfill gas upgrading is facilitated by enrichment of electroactive Methanothrix and Thiobacillusorganisms on one hand; additionally anaerobic methanogenesis processes with high organic loads con⁃sume many protons leading to increased alkalinity within the system thus enhancing absorption capacityfor CO2 into liquid phase. This further facilitated the reduction of CO2 content and the elevation of CH4content in landfill gas.

国家自然科学基金资助项目(52200039);中国博士后科学基金资助项目(2022M710513);重庆市杰出青年科学基金资助项目(CSTB2022NSCQ-JQX0023)

聂文博, 陈一. 垃圾渗滤液处理同步填埋气脱硫脱碳提纯[J]. 能源环境保护, 2024, 38(1): 85-92.

NIE Wenbo, CHEN Yi. Simultaneous implementation for landfill leachate treatment and desulfurization and decar⁃bonization of landfill gas purification[J]. Energy Environmental Protection, 2024, 38(1): 85-92.