搅拌对牛粪干式厌氧发酵效果的影响

Effect of Mixing on Dry Anaerobic Digestion of Dairy Manure

摘要:

利用自制干式厌氧发酵罐，通过批次试验，研究了高温（55℃）条件下搅拌对牛粪干式厌氧发酵效果的影响。连续搅拌转速为8~32r/min时，产气效果无明显差异。采用8r/min间歇搅拌，所得到的甲烷产量比连续搅拌低约10%，但能大幅降低搅拌能耗，在干式厌氧发酵系统中更为适用。反应过程中，各组间发酵料液的pH值、挥发性有机酸浓度、总碱度和氨氮浓度无明显差异。

Abstract:

Effect of mixing on dry thermophilic (55℃) anaerobic digestion of dairy manure was investigated. No significant difference in fermentation performance was observed between continuous mixing speeds of 8~32r/min. Compared to continuously mixing, although 10% less methane was produced with batch slightly mixing. It greatly decreased energy consumption for mixing, and more suitable for dry anaerobic digestion. No significant difference in pH value, concentrations of ammonia, volatile fatty acid and total alkalinity was observed among different mixing conditions during digestion. 