复合菌剂预处理玉米秸秆及厌氧发酵产沼气

Corn straw pretreated by microbial agent and biogas production by anaerobic fermentation

对比研究了9组不同配比的复合菌剂预处理玉米秸秆及厌氧发酵产沼气的效果,采用秸秆失重率及木质纤维降解率分析复合菌剂的降解能力,并通过沼气和甲烷的产量分析复合菌剂的产气性能.研究结果表明,D4组秸秆失重率及木质纤维素降解率最高,其次为I9组.30d的发酵周期内,I9菌剂处理后秸秆厌氧发酵效果最好,出现两个产气和产CH4的高峰期,累积产气量和产CH4量分别提高36.6%、39.0%,这说明采用合适的菌剂配比预处理秸秆能较大地提高厌氧发酵的产气量和消化效率.D4组秸秆木质纤维降解率虽最高,但产气并不是最高的,这说明降解率和产气量并不成正比.根据产气要求,选择最佳复合菌剂的配比为I9组,即复合菌、真菌、放线菌及细菌、绿色木霉的体积比为3∶3∶2∶1.

The effect of 9 groups of different proportion of microbial gents on corn straw pretreatment and biogas production by anaerobic fermentation was compared in the work. Degradation ability of microbial agent was analysised with straw weight loss rate and lignocellulose degradation rate. Gas production performance of microbial gents was analysised with hiogas and methane production. It was shown that straw weight loss rate and lignocellulose degradation rate of group D4 were the highest,followed by the group I9. Within the fermentation period of 30 d,the effect of straw anaerobic fermentation which was treated by group I9 was best with two peaks of gas and CH4 production. The cumulative gas and CH4 production were increased by 36. 6%, and 39.0% respectively. This indicated that using suitable microbial agent ratio to pretreat corn straw can improve biogas production and digestion efficiency of anaerobic fermentation lagerly. It also suggested that lignocellulose degradation rate of D4 corn straw group was the highest, but the gas production was not the highest. Degradation rate and gas production rate was not proportional. According to the requirements of producing gas, the best mixture ratio of microbial gent was group I9. And the volume ratio of compound bacteria,fungi,actinomyces and bacteria, trichoderma viride was 3 ： 3 ： 2 ： 1.