铁刨花投量对餐厨垃圾和污泥协同厌氧消化的影响

Effect of Iron Shavings Dosage on Methane Production during Synergistic Anaerobic Digestion of Kitchen Waste and Municipal Sludge

餐厨垃圾和城市污泥是两种不同来源的有机固废,为提高这两种有机固废的协同厌氧消化效率,添加了来自机械加工厂的废弃物铁刨花,考察其对有机固废厌氧消化产甲烷和产气量的影响。结果表明:随着铁刨花投加量的增大,进入稳定产甲烷阶段所需时间缩短。当铁刨花投加量为25 g/L时,最高甲烷浓度、最高日产气量、累积产气量比对照组分别提高了33%、74%、120%,氨氮浓度在第15天比对照组降低了21%。在原有消化条件下,投加适量铁刨花有助于提高产气效果,增强系统运行的稳定性。

Two types of organic solid waste, bic stabilization.Therefore,iron shavings produced from mechanical plant were added to the mixed solid waste anaerobic digestion system to improve the synergistic anaerobic digestion efficiency.Effects of iron shavings on methane production and biogas yield in the system were studied.The results showed that, with the increase of iron shavings dosage,the time to enter the stable methanogenesis stage was shortened.When the iron shavings dosage was 25g/L,the maximum methane content,maximum daily gas production,and cumulative gas production were increased by 33%,74%,and 120%,respectively.On the 15th day,the NH3-N content was reduced by 21%than the control group.Adding proper iron shavings will help to improve the gas production effect and strengthen the operation stability of the system under the original digestion conditions.