Effects of ammonia on methane oxidation in landfill cover materials
2014
Long, Yu-Yang | Liao, Yan | Miao, Jing-Yu | Shen, Dong-Sheng
The effects of ammonia (NH₃) on CH₄attenuation in landfill cover materials consisting of landfill cover soil (LCS) and aged municipal solid waste (AMSW), at different CH₄concentrations, were investigated. The CH₄oxidation capacities of LCS and AMSW were found to be significantly affected by the CH₄concentration. The maximum oxidation rates for LCS and AMSW were obtained at CH₄concentrations of 5 % and 20 %(v/v), respectively, within 20 days. CH₄biological oxidation in AMSW was significantly inhibited by NH₃at low CH₄concentrations (5 %, v/v) but highly stimulated at high levels (20 % and 50 %, v/v). Oxidation in LCS was stimulated by NH₃at all CH₄concentrations due to the higher conversion of the nitrogen in NH₃in AMSW than in LCS. NH₃increases CH₄oxidation in landfill cover materials.
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