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 as the conversion characteristics of H2S,CO2,and CH4 in landfill gas during the operation of pre-short-range nitrification MBfR and post-MBfR.After 280 days of operation,experimental results demonstrated 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 enabling partial nitrification coupled DAMO-Anammox process.The average removal rates for COD,NH4,and TN 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 less than 0.2％,and H2S content decreased to approximately 5％,while CH4 content increased to around 80％.This significant upgrade in landfill gas can be attributed to highly active denitrifying anaerobic methanogenic archaea species within the electron transfer system which enhance CO2-reducing CH4 production through direct electron transfer between species.Furthermore,this study highlights how effi-cient landfill gas upgrading is facilitated by enrichment of electroactive Methanothrix and Thiobacillus organisms 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 capacity for CO2 into liquid phase.This further facilitated the reduction of CO2 content and the elevation of CH4 content in landfill gas.
关键词
垃圾渗滤液/短程硝化/反硝化型厌氧甲烷氧化/厌氧氨氧化/产甲烷/填埋气脱硫脱碳
Key words
Landfill leachate/Partial nitrification/Denitrifying anaerobic methane oxidation/Anam-mox/Methanogenesis/Desulfurization and decarbonization for landfill gas
维普
万方数据