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接种比例和温度对餐厨废弃物厌氧发酵特性的影响

Keywords: 厌氧发酵,餐厨废弃物,接种比例,温度

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Abstract:

为提高餐厨废弃物厌氧发酵的甲烷转化率和挥发性固体降解率,分别在35℃和55℃条件下,采用批式发酵工艺,考察了接种物与底物的挥发性固体量之比对餐厨废弃物厌氧发酵挥发性固体甲烷产率、挥发性固体降解率、液相末端产物组成和pH值等发酵特性的影响。结果表明,温度和接种比例共同决定厌氧发酵停留阶段,在35℃发酵时接种比例大于50:50的处理和55℃发酵时接种比例大于30:70的处理以产甲烷发酵为主,其余以酸化发酵为主;游离氨抑制导致高温组的甲烷含量、挥发性固体甲烷产率和甲烷转化率均低于中温组;发生酸化处理组底物的挥发性固体降解率均低于40%,产甲烷发酵处理组挥发性固体降解率均高于80%。

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