餐厨垃圾干式厌氧消化的试验研究

Experimental Study on Dry Anaerobic Digestion by Food Waste

采用猪粪厌氧消化的消化污泥为接种物,在中温(37℃)条件下,以连续进料的方式对餐厨垃圾的干式厌氧消化进行了运行试验研究,监测整个试验过程中产气量、pH、VFA、碱度、酸碱比等能够反应厌氧消化系统指标。结果表明,实验中系统最佳有机负荷为2.3 kg/(m^3·d)(以VS计)。正常运行过程中pH稳定在8.2～8.5之间,VFA稳定在7 300～12 000 mg/L,碱度在17 000～19 000 mg/L范围内,氨氮在3 500～5 500 mg/L范围内,底物含水率b保持上升并且达到93%左右。

The running of kitchen garbage dry continuous anaerobic digestion system was conducted under the condition of 37℃,with digested sludge of swine manure as inoculum.Some key parameters,such as methane production,pH,VFA,alkalinity,were monitored throughout the experiment process.The result showed that,the best organic load of the system was 2.3 kg/(m 3·d)(in VS).Under normal operation,pH,VFA,alkalinity and ammonia nitrogen concentration was stably at 8.2~8.5,7 300~12 000 mg/L,17 000~19 000 mg/L,3 500~5 500 mg/L,respectively,and the substrate moisture content was about 93%.