渗滤液添加量对餐饮垃圾厌氧消化的影响机制

Effect of amount of leachate added on food waste anaerobic digestion

系统地研究了渗滤液添加量对于餐饮垃圾厌氧消化产气过程的影响,结果分析表明,餐饮垃圾与渗滤液联合厌氧消化,可以有效地缓解酸抑制现象,增强厌氧消化系统的稳定性,提高沼气产率。当餐饮垃圾负荷为40 g·L^(-1),渗滤液与水的比例为1.227∶1,将厌氧消化原液的氨氮调节至2 000 mg·L^(-1)时,厌氧消化效果最好。沼气产率可达到840 m L·g^(-1)(以TS计),甲烷产率可达到375 m L·g^(-1),累积沼气产量达到理论值的94.32%,累积甲烷产量达到理论值的74.77%。

In this study,comparative experiments on anaerobic digestion of food waste were conducted using different ratios of leachate and water as the digestive medium. Our results show that anaerobic co-digestion of food waste and leachate relieved acid suppressants effectively,thus enhancing the stability of the anaerobic digestion system and increasing the yield of biogas. Anaerobic digestion was the highest when the load of the food waste was40 g·L-1（ on the base of tolal solid）,the ratio of leachate and water was 1. 227 ∶ 1,and the anaerobic digestion feed liquid was adjusted to 2 000 mg·L-1. The yield of biogas was 840 m L·g-1,corresponding to a cumulative biogas production of 94. 32% of the theoretical value. At the same time,the yield of methane was 375 m L·g-1,corresponding to a cumulative methane production of 94. 32% of the theoretical value.