接种量对红薯酒糟沼气发酵的影响

摘要

Effects of inoculum on mid-temperature anaerobic fermentation of sweet potato lees were studied. Gas production rate, pH value, amino nitrogen (NH4+ -N), volatile fatty acid (VFA) content, percentage of methane and reduction of TS and COD affected by four different inoculum at 45℃ were studied. The results showed that, with increase of inoculums, the accumulation of microorganisms shortened, peak of gas production brought forward and gas production period shortened, and moreover, the pH buffer capacity of fermentation system was improved. The highest gas production rate, average percentage of methane content and the reduction effects of TS and COD were 124. 14％, 66. 37％, 35.77％, 47. 90％,respectively when inoculum by 50％. pH values were within the range of normal fermentation.%研究不同接种量对红薯酒糟中温厌氧发酵的影响,探求红薯酒糟厌氧发酵的最佳接种量.在45℃时,比较4种不同接种量对红薯酒糟中温厌氧发酵过程中产气率、pH值、氨基态氮(NH4+-N)、挥发性脂肪酸(VFA)浓度、甲烷百分含量及TS、CODcr的去除效果的影响.结果表明:随着接种量的增加,微生物的积累周期减短,有利于产气高峰提前,缩短产气周期;同时能提高发酵系统酸碱的缓冲能力.其中,50%接种量的总产气率、甲烷平均百分含量及TS和COD去除率最高,分别为124.14%、66.37%、35.77%、47.90%;pH值都在正常发酵范围内.