菌剂添加比对厨余垃圾厌氧发酵的影响

Effect of Bacterial Agent Addition Ratio on Anaerobic Fermentation of Kitchen Waste

研究不同菌剂添加比条件下,厨余垃圾厌氧发酵的情况。结果表明:当菌剂添加量与厨余垃圾质量比为2:1时,pH值变化最为明显,反应在24 h时,pH值降到最低为5.2;反应进行到36 h时,pH值则又升至最高为6.2。挥发性脂肪酸(VFA)的含量整体变化趋势和pH值变化呈现相反的趋势,沼气累积产量和甲烷含量始终最高,分别为48.74 L、70.25%;化学需氧量(COD)的产量呈现相反的趋势。适量的菌剂添加量,能够促进厌氧发酵反应,超过一定量则会产生抑制作用。菌剂添加比为2:1时,厨余垃圾厌氧发酵效率较高。

Anaerobic fermentation of kitchen waste was studied under different ratios of bacteria.Results showed that when ratio of bacterial agent to kitchen waste was 2:1,pH change was the most obvious.At 24 hours,the pH decreased to the lowest of 5.2,and at 36 hours,the pH increased to the highest of 6.2.The overall change trend of VFA content and pH change showed the opposite.Cumulative yield of biogas and methane content was always in the highest position,48.74 L and 70.25%,respectively,and amount of COD showed the opposite trend.An appropriate amount of bacterial agent could promote anaerobic fermentation reaction.If it exceeded a certain amount,it would have an inhibitory effect.In conclusion,when bacterial agent addition ratio was 2:1,anaerobic fermentation efficiency of kitchen waste was high.