余热和菌剂对垃圾堆肥效率及温室气体减排的影响

Effects of waste heat and microbial agents on composting efficiency and greenhouse gas emissions reduction of municipal solid wastes

为探讨生活垃圾堆肥过程中同时添加外源菌剂和使用循环热风对缩短堆肥周期的影响,该文以15～80mm生活垃圾为原料,设置了无添加菌剂和无余热回用堆肥(对照)与添加菌剂和余热回用堆肥(处理)强制通风隧道发酵仓对比试验。结果表明:菌剂和余热利用后堆肥高温达到55℃的时间缩短了1～2d,高温堆肥时间7d,堆肥周期缩短为27d;按600t/d处理规模计算,菌剂和余热利用处理全年的温室气体比对照少排10150.65t(以CO2计);日进仓数由3个增加到4个,处理能力可以提高到800t/d。菌剂和余热利用能够有效提高堆肥效率,减少温室气体排放。

In order to discuss the effect of exogenous microbial agents and hot air recycling on composting cycle of municipal solid waste,15-80 mm sieved of municipal solid waste were used as raw material throughout the experiments,and the closed static high-temperature fermentation technology was conducted with forcibly aeration.The new technology of exogenous microbial agents and hot recycling composting was investigated and compared with the current technology without adding exogenous microbial agents and hot air recycling composting.The results showed that,after adding exogenous microbial agents and with hot air recycling,1-2 d was shorten to reach 55℃,high-temperature composting time was 7 d and the whole composting cycle was shorten to 27 d.Calculated by 600 t/d disposal capacity,the emissions of greenhouse gas with exogenous microbial agents and hot air recycling was reduced by 10 150.65 t CO2-equivalent per year than before.Besides,the daily working composting cells was increased from 3 to 4,and the disposal capacity could reach 800 t/d accordingly.Therefore,exogenous microbial agents and hot air recycling can greatly improve composting efficiency and reduce greenhouse gas emissions of municipal solid waste compost.