粪便、餐厨及芦苇混合厌氧消化过程中餐厨含量的影响研究

Influence of Kitchen Residue on Anaerobic Co-digestion of Feces, Kitchen Residue and Reed

采用完全混合湿式厌氧发酵方法,对餐厨、粪便及芦苇3种物料混合厌氧消化过程中餐厨含量的影响进行了研究。结果表明,餐厨加入量对这3种物料混合厌氧发酵影响显著。适当增加餐厨比例,有利于产气率的提高,但随着餐厨比例的增加,混合厌氧消化过程中乙酸、丙酸和丁酸含量增加明显,较容易出现"酸化"现象而影响产气效果。粪便、芦苇与餐厨湿重比为7∶2.5∶3时,产气效果最佳,最高容积产气率为1118mL·L-1·d-1,平均甲烷含量为64.6%,COD去除率达到68.56%。随着餐厨比例的增加,NH3-N含量逐渐增加,但未对厌氧消化产生抑制作用。

Influence of kitchen residue on anaerobic co-digestion of feces, kitchen residue and reed, which are the main organic waste, was investigated. The results showed that kept at mesophilic temperature（36±1）℃ and 6%~7% total solid content, the quantity of kitchen residue had significant effects on anaerobic co-digestion of the three kinds of materials. Appropriately increasing the proportion of kitchen residue was helpful to raise gas yield. However, higher kitchen residue could lead to acidification and less gas yield, which resulted from the concentrations of acetic acid, propionic acid and butyric acid during the process of anaerobic co-digestion obviously increasing. The highest biogas yield was 1 118 mL·L^-1·d^-1 and the average methane content was 64.6%, with COD removal efficiency being up to 68.56% when the ratio of feces, reed and kitchen residue was 7∶2.5∶3. As the proportion of kitchen residue increased, increase trend of NH3-N concentration was found. However, anaerobic co-digestion inhibition was not observed.