多元有机废弃物强化餐厨垃圾厌氧消化

Mixed anaerobic digestion of dairy manure with food waste and corn stalks compost

研究了不同总固体(TS)有机负荷对餐厨垃圾厌氧发酵的影响.餐厨垃圾和堆肥玉米秸秆混合物在不同TS有机负荷梯度下混合厌氧消化,结果表明TS有机负荷越高,甲烷产气速率越低,发酵时间越长;对比了不同C/N和有机负荷下氨氮(TAN)向游离态氨氮([NH3])的转化水平,有机负荷是影响TAN向[NH3]转化的主要因素:餐厨垃圾的有机负荷限制了容积负荷产气量;添加奶牛粪强化了餐厨垃圾和堆肥玉米秸秆混合消化容积产气量.在添加质量分数为2%TS有机负荷的奶牛粪,甲烷积累产气量提升了21%,甲烷产气速率提高40%,甲烷积累产气量为4. 41 L/Lwork(Lwork为有效工作容积),甲烷产气速率0. 361 L/Lwork·d-1.该工作实现了多元有机废弃物共同强化餐厨垃圾的厌氧消化,为餐厨垃圾厌氧消化工艺提供理论和实践依据.

The effect of different total solid(TS,food waste and corn stalk compost)organic loading ratios on the anaerobic digestion was studied.The results demonstrate that the higher TS organic loading ratios could both slow the producing rate of methane gas and prolong the digestion time(T90).The[NH 3]/TAN was applied to investigate the conversion level of TAN to free[NH 3]at different C/N and different TS loading ratio.The result showed that the organic load is the major factor affecting the transformation of TAN to free[NH 3].Simultaneously,the working volume of gas production was controlled by the organic loading ratios of food waste.The working volume of gas production from food waste mixture and corn stalks compost was enhanced by adding dairy manure.Under 2%TS organic loading of dairy manure,the methane accumulation and gas production rate were increased by 21%and 40%,respectively.The results indicated that the optimum methane accumulation was 4.41 L/L work and the methane production rate was 0.361 L/L work·d^-1,while the percentage of dairy manure is 2%TS of the working volume in the fermentation process.It was shown that the anaerobic digestion of food waste could be co-intensified by multiple organic wastes.