通风温度对生活垃圾生物干化脱水的影响

以高含水率生活垃圾为研究对象,研究了不同的通风温度(室温、40℃低温、55℃中温、65℃高温)对生物干化的影响。结果表明,通风温度变化对堆体温度影响较小;高温通风(65℃)能有效地降低垃圾含水率,但不利于有机物的降解,产物的挥发性固体(VS)和可生物降解物质(BDM)值最高,稳定度最低;经过15 d的干化作用,4组反应器垃圾含水率显著降低,水分去除率分别为77.99%,79.37%,79.85%,79.47%;另外还伴随着厨余和纸张的降解;通风温度与热值提升呈正相关关系,各组出料的湿基低位热值分别为7 202 kJ/kg,9 276.4 kJ/kg,9 358.5 kJ/kg,10 064 kJ/kg,分别提高了72.2%,122.7%,123.7%,140.6%。

Effect of bio-drying with various ventilation temperature on high-water-content municipal solid waste

Effect of bio-drying with various ventilation temperature （room temperature,40 ℃,55℃,65 ℃） was investigated on high-water-content municipal solid waste （MSW）. The results showed that the variation of ventilating temperature had less effect on temperature of the piles. Ventilation with high temperature（65℃） could effectively reduce the water content of MSW, but against the degradation of organics. The values of volatile solid （VS） and biodegradable materials （BDM） of product were highest, but the stability was least. After 15 days’ bio-drying, with the degradation of food waste and paper, etc., the water contents of MSW in 4 groups of reactors were significantly reduced. Water- removal rates were 77.99% ,79.37% ,79.85% and 79.47%. Moreover, positive correlation was between ventilation temperature and heating value. Wet lower heating value of effluents in 4 reactors were 7 202 kJ/kg,9 276.4 kJ/kg, 9 358.5 kJ/kg and 10 064 kJ/kg, increased for 72.2%, 122.7%, 123.7% and 140.6%, respectively.