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化工学报  2014 

玉米秸秆高浓度厌氧发酵的启动过程特性

DOI: 10.3969/j.issn.0438-1157.2014.05.043, PP. 1862-1867

Keywords: 厌氧,发酵,废物处理,接种物,高浓度,启动

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Abstract:

高浓度厌氧发酵具有单位体积产气率高、原料处理量大、需水量小、能耗低等优点,同时存在启动难和易酸化的问题。以玉米秸秆为原料,研究秸秆高浓度发酵过程接种物、分批进料结合渗滤液回流对启动的影响。结果表明,分批进料结合渗滤液回流工艺可有效实现高浓度厌氧发酵系统的稳定启动,反应器启动运行22d,以污泥为接种物的秸秆累积产沼气量为43.54ml·(gTS)-1,以湿法发酵的沼液为接种物的秸秆累积产沼气量为115.15ml·(gTS)-1。与以厌氧污泥为接种物的发酵系统相比,以湿式发酵沼液为接种物的高浓度厌氧发酵系统秸秆微观结构变化更明显,主要表现为半纤维的溶解;荧光原位杂交技术(FISH)结果也表明两种接种物系统的甲烷菌形态存在明显差异。

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