通风方式对高含水率垃圾生物干化的影响

以高含水率混合收集生活垃圾为研究对象,研究了不同的通风方式(间隙通风10min/20min、间隙通风5min/25min、40℃热空气通风和间隙-连续通风)对生物干化影响.结果表明,40℃热空气通风和间隙-连续通风可提高产物含水率下降幅度、单位质量垃圾水分去除率、单位有机物降解脱水容量、产物低位热值;但堆体高温持续时间短,VS消耗量小,并且有机物稳定化程度低.经过18d的干化试验,4组试验产物含水率分别为39.6%,34.4%,23.7%,24.5%,相应的单位去除率(以原生垃圾质量计)为0.437,0.476,0.523,0.517kg/kg,低位热值为11954,12994,15760,14801kJ/kg,与原生垃圾相比,热值分别提高了121%、140%、191%及173%,以40℃空气通风产物热值最高.

Effect of aeration modes on high water content municipal solid waste bio-drying

Aeration methodologies for bio-drying of high-water-content municipal solid waste(MSW) was tested.Four respective trials were conducted with different aeration methodologies(intermittent aeration 10min/20min;intermittent aeration 5min/25min,40℃ air intermittent aeration and intermittent-continuous aeration).The results showed that the last two modes lead to more effective water content evaporation,increased dehydration ratio of per raw wet waste,water removal capacity of per organic waste decomposition and output lower heat value(LHV).However,it also resulted in shorter period of biomass high-temperature(above 60℃) stage,fewer volatile solid(VS) consumption,and lower rate of organic stabilization.After 18d bio-drying,the water content of four trials output were 39.6%,34.4%,23.7% and 24.5%,respectively.Water removal per initial raw waste was 0.437,0.476,0.523,and 0.517kg/kg,respectively.The output LHV was 11954,12994,15760 and 14801kJ/kg,respectively.Compared with that of the initial waste,the LHV enhanced 121%,140%,191% and 173%,respectively.The highest output LHV was that of 40℃ air aeration mode.