低温沼气发酵促进剂的研究

摘要

通过低温野生菌群和低温厌氧颗粒污泥菌群筛选,及其后续的互补复合优化,选育出了低温沼气发酵功能菌群。沼气发酵实验结果表明,该菌群采用后最高日产气量均明显高于单独采用野生菌群和厌氧颗粒污泥菌群,具有显著改善低温沼气发酵性能。以此为基础研制的低温沼气发酵促进剂,在13℃下可使产气率平均提高46.6%,10℃下产气率平均提高41.1%。沼气池试验中,低温沼气发酵促进剂可显著提高沼气的甲烷含量,可使甲烷含量平均提高24%。%By screening and optimizing from wild microflora and anaerobic granular sludge microflora coming from low temperature environment,a functional microflora was breeded for methane fermentation.Using this functional microflora to methane fermentation,the maximum daily biogas output was obviously higher than that of using wild microflora and anaerobic granular sludge microflora.This result revealed that the functional microflora could remarkably improve the performance of methane fermentation at low temperature.On the basis of this study,we obtained an accelerant which could remarkably increase biogas output at low temperature from the functional microflora.The simulation fermentation experiments in the lab suggested that the accelerant could speed up the start-up of the fermentation.The average gas production rates at 13 ℃ and 10 ℃ were increased by 46.6% and 41.1% 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 can remarkalby increase the methane content of biogas by 24% at low temperatures in winter,the average methane content increased by 24% compared with the control biogas pool.