N2O emission from a combined ex-situ nitrification and in-situ denitrification bioreactor landfill |
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| Authors: | Ya-nan Wang Ying-jie Sun Lei Wang Xiao-jie Sun Hao Wu Rong-xing Bian Jing-jing Li |
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| Institution: | 1. School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;2. School of Environmental and Municipal Engineering, Qingdao Technological University, Qingdao 266033, China;3. College of Environmental Science and Engineering, Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology, Guilin University of Technology, Guilin 541004, China;4. Sanlihe Subdistrict Office, Jiaozhou, Qingdao 266033, China |
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| Abstract: | A combined process comprised of ex-situ nitrification in an aged refuse bioreactor (designated as A bioreactor) and in-situ denitrification in a fresh refuse bioreactor (designated as F bioreactor) was constructed for investigating N2O emission during the stabilization of municipal solid waste (MSW). The results showed that N2O concentration in the F bioreactor varied from undetectable to about 130 ppm, while it was much higher in the A bioreactor with the concentration varying from undetectable to about 900 ppm. The greatly differences of continuous monitoring of N2O emission after leachate cross recirculation in each period were primarily attributed to the stabilization degree of MSW. Moreover, the variation of N2O concentration was closely related to the leachate quality in both bioreactors and it was mainly affected by the COD and COD/TN ratio of leachate from the F bioreactor, as well as the DO, ORP, and NO3?-N of leachate from the A bioreactor. |
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| Keywords: | Municipal solid waste (MSW) Bioreactor landfill Influencing factor |
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