秸秆对厨余垃圾堆肥渗滤液减排的影响

Effect of straw on emission reduction of kitchen waste composting leachate

针对垃圾分类后收运过程中组分间的相互污染问题,以十堰市茅箭区厨余垃圾为研究对象,对其各项理化性质进行测定并对比厨余垃圾堆肥与厨余垃圾+秸秆堆肥中腐熟度指标和氨气变化。结果表明:茅箭区生活垃圾经精细分类后,厨余垃圾可降解有机物纯度较高,达到80%左右,其含水率为71%,TOC平均达458.16 g/kg,pH为4.72,C/N达到33.4,堆肥效果显著。由堆肥过程中腐熟度指标变化可得,厨余垃圾与秸秆联合堆肥腐熟度较厨余垃圾单独堆肥效果更好;厨余垃圾+秸秆堆肥中渗滤液产生量为0,而厨余垃圾堆肥渗滤液主要在堆肥前期产生,占堆肥总量的18.26%。在气体产生方面,氨气产生高峰出现在厨余垃圾+秸秆堆肥中后期,产生量略高于厨余垃圾堆肥。

Given the problem of mutual pollution among components in the process of garbage collection and transportation after classification,taking the kitchen waste in Maojian District of Shiyan City as the research object,the physical and chemical properties of the kitchen waste were determined,and the maturity index and ammonia changes in the kitchen waste compost and the kitchen waste+straw compost were compared.The results show that after fine classification,the purity of degradable organic matter of kitchen waste in Maojian district was about 80%,the moisture content 71%,the average TOC 458.16 g/kg,the pH 4.72,and the C/N ratio 33.4.According to the change of maturity index during the composting process,the combined composting of kitchen waste and straw had better maturity than the single composting of kitchen waste;the amount of leachate produced in kitchen waste+straw composting was 0,while the leachate produced in kitchen waste composting mainly occurred in the early stage of composting,accounting for 18.26%of the total amount of composting.In terms of gas production,the peak of ammonia production appeared in the middle and late stage of kitchen waste+straw composting,and the production was slightly higher than that of kitchen waste composting.