偏低温沼气发酵促进剂的初步研究

Research on Biogas-fermentation Accelerant at Relatively Low Temperature

沼气池通常采用常温发酵,在低温时节产气不足,严重影响沼气的推广和使用。偏低温沼气促进剂由微生物混合菌剂辅以酒糟浸出液和微量的无机盐成分而成。实验室模拟发酵实验表明,该促进剂可加速发酵启动,6～25d增产效果显著,实验组比对照组总产气量提高了38.9%,总固体(TS)降解率相对提高了46.3%,挥发性固体(VS)降解率相对提高了39.8%,产沼气的甲烷量也有所提高。气池投放实验表明,在冬季低温条件下,促进剂投入6d后开始产生效果;实验组产气量比对照组高;作用最显著的时期为9～24d;实验组产气总量比对照组提高37.4%。

Normal temperature fermentation is usually adopted for biogas pool. However, the insufficient output of biogas in low temperature seasons would seriously inhibit the use ofbiogas. In this experiment, an acceterant which could remarkably increase biogas output at low temperature was developed. Such accelerant was a mixed-microbial-agent supplemented by distiller＇s grains lixivium and small quantity of inorganic salt. The simulation fermentation experiments in Lab suggested that such accelerant could speed up the start-up of the fermentation, and biogas output increase was remarkable from the 6th day to the 25th day. The total output, relative degradation rate of total solids andof volatile solids were increased by 38.9 %, 46.3 % and 39.8 % respectively in experimental group compared with control group. Besides, methane content in biogas was also enhanced. The subsequent biogas pool use experiments indicated that the accelerant started to take effect on the 6th day at low tem- peratures in winter（the effects were remarkable from the 9th day to the 24th day） and biogas output increased （37.4 % higher than control biogas pool）.