秸秆对复配体系下联合厌氧消化酸抑制的缓解

Alleviation Effect of Corn Straw on Acid Inhibition in Combined Anaerobic Digestion of Mixture System

以餐饮垃圾和玉米秸秆为消化原料,以中老龄渗滤液为消化介质组成复配体系,研究原料配比对餐饮垃圾和玉米秸秆联合厌氧消化的影响,探讨玉米秸秆的添加对联合厌氧消化体系中酸抑制的缓冲效应。实验结果表明,复配体系联合厌氧消化实验组中,餐饮垃圾与玉米秸秆总固体质量比1∶3实验组产气效果较好,产气率达到0.35 L/g,玉米秸秆的添加使产气量和产气率分别提高98%和68%。通过对消化液中pH和VFA浓度的监测结果表明,玉米秸秆的添加能够缓解联合厌氧消化期间的酸抑制作用,提高复配体系厌氧消化系统的缓冲性和稳定性。同时,对复配体系的消化液BOD5和COD检测结果表明,联合厌氧消化能够提高消化沼液的可生化性。因此,在餐饮垃圾和渗滤液复配体系中加入秸秆,可有效提高餐饮垃圾厌氧消化的产气率和生物降解效率。

The effect of raw materials ratio on the combined anaerobic digestion of food waste and corn straw was studied in a mixture system,with food waste and corn stalks as the digestion raw materials and mature landfill leachate as the digestion medium.The buffer effect of the addition of corn straw on acid inhibition in combined anaerobic digestion system was discussed.The experimental results showed that in the combined anaerobic digestion group of mixture system,the experimental group with a total solid mass ratio of food waste and corn stalks of 1∶3 had the best gas production,the biogas production rate reached 0.35 L/g.The addition of corn stalks increased the gas production and biogas production rate by 98%and 68%,respectively.The results of monitoring the pH and VFA concentrations in the digested effluent showed that the addition of corn straw could alleviate the acid inhibition during the combined anaerobic digestion,and improve the buffering and stability of the anaerobic digestion system of the mixture system.At the same time,the detection results of BOD5and COD in the digestive fluid of the mixture system indicated that the combined anaerobic digestion could improve the biodegradability of the digestive fluid.Therefore,the addition of corn straw to the mixture system of food waste and leachate could effectively improve the gas production rate and biodegradation efficiency of anaerobic digestion of food waste.