Experimental study on aerobic accelerated stabilization and carbon and nitrogen migration of municipal solid waste
XIAO Dian-kun1,2, CHEN Yun-min1,2, XU Wen-jie1,2, ZHAN Liang-tong1,2, KE Han1,2, HE Hai-jie1,3, LIU Yuan-feng1,2
1. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Zhejiang University, Hangzhou 310058, China; 2. Center for Hypergravity Experimental and Interdisciplinary Research, Zhejiang University, Hangzhou 310058, China; 3. School of architectural engineering, Taizhou University, Taizhou 318000, China
Abstract：The 3-4-year-old municipal solid waste (MSW) of Shanghai Laogang landfill was selected for the indoor forced ventilation unit test. The changes of solid, liquid, and gas components were monitored, and the reduction law of organic pollution load and the migration law of carbon and nitrogen were analyzed and studied. The results show that: The value of cellulose/lignin (C/L) in the solid phase decreased from the initial 0.8 to less than 0.4, BDM, TOC, and TN in the solid phase also decreased. The degradation rate of solid index was large in the early stage and small in the late stage, and the degradation degree of waste in the upper layer was greater. The pH and EC of the liquid phase were maintained in a fixed range, and the organic pollution load has been greatly reduced. During the whole test period, the degradation rates of TOC, COD, and BOD reached 97%, 94%, and 94% respectively. The degradation rates of TN and NH4-N reached 95% and 94% respectively. During the test, the cumulative CO2 release was 6.7kg and the cumulative N2release was 0.75kg. C/L value, degradation stabilization normalization index β can be used as indexes to judge the stabilization degree of MSW. BOD/COD and NH4-N/TN values can be used as indicators to determine the stability of degradable substances in the liquid phase. According to the principle of mass conservation, the migration of carbon and nitrogen during the experiment was analyzed. The cumulative loss of carbon mass in the solid phase was 2.09kg, the cumulative loss of carbon mass in the liquid phase was 0.14kg, and the cumulative release of carbon mass in CO2 was 1.83kg. The cumulative loss of nitrogen mass in the solid phase was 0.62kg, the cumulative loss of nitrogen mass in the liquid phase was 0.08kg, and the cumulative release of nitrogen mass in N2was 0.75kg. After the degradation, there are still a large number of non-degradable or refractory carbon and nitrogen compounds in the solid phase.
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XIAO Dian-kun, CHEN Yun-min, XU Wen-jie, ZHAN Liang-tong, KE Han, HE Hai-jie, LIU Yuan-feng. Experimental study on aerobic accelerated stabilization and carbon and nitrogen migration of municipal solid waste. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(5): 2204-2212.
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