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摘要
Anaerobic oxidation of CH4 (AOM) and the rate of N2O emissions were investigated using aged refuse, landfill cover soil and two mineral soils (sandy and clay soils). The influences of particle size, temperature and soil moisture content were also evaluated. The maximum AOM rate in incubated aged refuse was 0.12 mu mol/g/h, which was several times higher than AOM rates of the three soils and two to three orders of magnitude higher than rates reported in previous studies. The average CH4 oxidation rate for aged refuse with water contents in the range of 10-30% was 1.97 mu mol/(g.d), which was 1.61 (P<0.01), 1.84 (P<0.01), and 3.05 (P<0.01) times more than those of the cover soil, clay soil, and sandy soil, respectively. The conversion ratios of CH4 to CO2 were 43.8-52.3%, 26.5-50.5%, 23.4-49.6%, and 20.9-49.5% for aged refuse, cover soil, clay soil, and sandy soil, respectively. The average CH4-to-CO2 ratio for the four sample types followed the order of aged refuse > cover soil > clay soil > sandy soil. Additionally, the average N2O emission rate for aged refuse was 3.79 (P<0.01), 3.82 (P<0.01) and 5.50 (P<0.01) times more than those of the cover soil, clay soil, and sandy soil, respectively. The environmental implications of these findings are that application of an aged refuse bio-cover to a municipal solid waste landfill can reduce CH4 emissions, which would significantly reduce the effect on global warming of solid waste management operations.
- 出版日期2016
- 单位中央民族大学; 环境保护部南京环境科学研究所
