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环境化学 2015

两相厌氧发酵互花米草的特性

梁越敢,花日茂,李学德,郑正,罗兴章,梁睿

Keywords: 互花米草,两相厌氧发酵,固态水解,FA,结构变化

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Abstract:

利用两相(固态水解酸化相+湿式发酵产甲烷相)发酵互花米草,通过尿素的添加来调整厌氧发酵互花米草的碳氮比,考察两相厌氧发酵互花米草的特性;并利用FTIR考察水解发酵前后互花米草结构的变化.研究结果表明,由于固态水解渗滤液对尿素的淋滤,产生高浓度的氨氮溶液,抑制了湿式发酵产甲烷反应器中的甲烷菌;通过53d的两相发酵互花米草,单位挥发性固体(VS)累积产气量仅为98.6mL·g-1(0℃),转化率是理论产气量的17.5%;游离性氨(FA)浓度超过55mg·L-1,就会严重抑制高温甲烷菌;红外光谱分析表明,石灰堆沤预处理对互花米草结构改变较小;只有大幅度的强化预处理,才能显著提高互花米草发酵的产气量.

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