家庭厨余垃圾分布式就地厌氧消化工艺及效果研究

针对厨余垃圾收运后集中处理模式的收集难、成本高的问题，设计了分布式就地厌氧消化工艺，用研制的设备进行半连续试验。运行80 d左右趋于稳定，稳定后的VS去除率高于60%;VS_进料产气率、VS_进料甲烷产率分别为0.444 m³/kg VS、0.245 m³/kg VS,VS_去除产气率、VS_去除甲烷产率分别为0.737 m³/kg VS和0.413 m³/kg VS左右；pH值从5.5升至7.5,稳定阶段的碱度为4 750 mg/L左右；VFAs先增后降至570mg/L,VFAs/碱度先从0.64增至0.8,然后降至0.4以下；丁酸、丙酸和乙酸分别占出料VFAs的74.2%、9.2%、6.7%,丙酸/乙酸低于1.4;沼气净化后，甲烷含量为96%～97%。

Process and effect of distributed in-situ anaerobic digestion for household kitchen waste

In order to In order to solve the problems of difficult collection and high cost of centralized treatment mode of kitchen waste after collection and transportation,a distributed in-situ anaerobic digestion process was designed,and semi-continuous test was carried out with the developed equipment.The process and equipment tended to be stable after running around 80 days,and the VS removal rate was higher than 60%.VS_feed gas production rate and VS_feed methane production rate were 0.444 m³/kg VS and 0.245 m³/kg VS respectively,and VS_removal gas production rate and VS_removal methane production rate were about 0.737 m³/kg VS and 0.413 m³/kg VS respectively.pH value increased from 5.5 to 7.5,and the alkalinity in the stable stage was about 4750 mg/L.VFAs increased first and then decreased to 570 mg/L,VFAs/alkalinity increased from 0.64 to 0.80,and then dropped to below 0.40.The proportion of butyric acid,propionic acid and acetic acid were 74.2%,9.2%and 6.7%respectively,and propionic acid to acetic acid ratio was below 1.4.Methane content was 96%to 97%after biogas purification.