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牲畜粪便与秸秆混合的厌氧发酵效果及影响因素分析

Keywords: 混合,厌氧发酵,温度,C/N比,pH值

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Abstract:

为进一步明确混合原料厌氧发酵效果及影响因素,以牛粪、鸡粪和麦秆为发酵原料,按总固体质量比分别设定了单一原料、两种及3种原料混合发酵组,分别在20℃和35℃下进行厌氧消化试验,研究了原料不同比例混合、温度、C/N比和pH值对厌氧发酵效果的影响。结果表明,原料混合发酵可显著提高总产气量、TS利用率和TS产气率;牛粪、鸡粪和麦秆3种原料混合后发酵效果显著好于单一原料以及牛粪与麦秆、鸡粪与麦秆两种原料混合的发酵效果。中温发酵效果显著好于低温发酵;牛粪、鸡粪与麦秆混合厌氧发酵的最适C/N比为25.64~27.54;混合原料发酵的pH值变化平稳且更容易维持在发酵适宜pH范围内。原料混合、温度、C/N比和pH值对厌氧发酵均有影响。

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