Removal of high concentrated ammonia nitrogen from landfill leachate by landfilled waste layer

Abstract： The landfill of municipal solid waste(MSW) could be regarded as denitrification reactor and used in ammonia nitrogen biological removal process. In this research, the process was applied to municipal solid waste(MSW) collected in Shanghai, China, which was characterized with high food waste content. The NH4+ removal efficiency in the system of SBR nitrifying reactor followed by fresh and matured landfilled waste layer in series was studied. In the nitrifying reactor, above 90% of NH4+ in leachate was oxidized to NO2- and NO3-. Then high concentrated NO2- and NO3- was removed in the way of denitrification process in fresh landfilled waste layer. At the same time, degradation of fresh landfilled waste was accelerated. Up to the day 120, 136.5 gC/(kg dry waste) and 17.9 gN/(kg dry waste) were produced from waste layer. It accounted for 50.15% and 86.89% of the total carbon and nitrogen content of preliminary fresh waste, which was 4.42 times and 5.17 times higher than that of reference column respectively. After filtering through matured landfilled waste, BOD5 concentration in leachate dropped to below 100 mg/L, which would not affect following nitrification adversely. Because the matured landfilled waste acted as a well methanogenic reactor, 23% of carbon produced accumulatively from fresh landfilled waste degradation was converted into CH4. 作 者： GUO Hui-dong    HE Pin-jing    SHAO Li-ming    LI Guo-jian   作者單位： State Key Laboratory of Pollution Control & Reclamation,Tongji University,Shanghai 200092,China  期 刊： 環境科學學報（英文版）  ISTICSCI   Journal： JOURNAL OF ENVIRONMENTAL SCIENCES  年，卷(期)： 2004, 16(5)  分類號： X703 X705  Keywords： landfill leachate recirculation    ammonia biological removal    fresh landfilled waste    matured landfilled waste   

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