添加酒糟、草木灰对猪粪厌氧发酵的影响

以猪粪为发酵原料,研究在25℃条件下分别添加不同量的酒糟、草木灰对厌氧发酵产沼气的影响,分析了厌氧发酵过程中产气速率、累积产气量、pH值、氨态氮质量浓度及甲烷含量的变化。结果表明,在猪粪中添加草木灰1 g,累积产气量大且甲烷含量高;添加酒糟5 g,累积产气量大且甲烷含量高。添加1,3,5 g草木灰,pH值呈现降低—升高—稳定的趋势,氨态氮呈现升高—降低—稳定的趋势;添加1,3,5 g酒糟后,发酵过程中的pH值和氨态氮变化规律相似,均呈现升高—降低—升高—稳定的趋势。因此,合理的酒糟、草木灰添加量是提高猪粪厌氧发酵产气量及甲烷含量的前提。

The influences of adding lees and plant ash on anaerobic fermentation of pig manure

Take the pig manure as fermentation materials,the effect of,by adding varying amounts of lees and plant ash on the anaerobic fermentation biogas production at 25 ℃,the aerogenesis rate、accumulated gas production,pH,NH3-N content and CH4 content in the anaerobic fermentation process was analyzed.The results show that the accumulated gas production get the highest as well as the CH4 content when adding 1g plant ash;the same as adding 5 g lees into the pig manure.Adding 1,3 g and 5 g lees in the anaerobic fermentation process respectively,the tendency of pH present drop-increase-drop,and NH3-N increase-drop-increase.But Adding 1,3 g and 5 g plant ash respectively in the anaerobic fermentation process,the tendency of pH and the NH3-N are similar,increases at first then reduces and finally becomes stable.In a conclusion,reasonable lees and plant ash addition is the premise to improve the amount of gas production and CH4 content in the pig manure anaerobic fermentation process.