堆沤预处理对玉米秸秆厌氧发酵产气性能及模型

Biogas Production and Model for Anaerobic Fermentation of Corn Straws by Composting Treatment

为了促进玉米秸秆的降解,同时使产气高峰提前以达到提高产气速率的目的,对玉米秸秆的预处理方式进行了分析。所采用的方法为堆沤处理,分为加水堆沤和加沼液堆沤两组试验,堆沤时间设为2、4、6、8 d四个不同数值。结果显示,堆沤后各组产气高峰大都有所提前,但峰值产气量并未发生明显变化,甚至稍有降低,可能是玉米秸秆中部分有机物质在堆沤时被消耗所致。作者对发酵时间和产气量进行了模型拟合,拟合效果较好。

To achieve better production and shorten the whole process,pretreatment of corn stalk was investigated.Corn stalk was composted separately with 2 kinds of liquid （water,digested effluent）.The composting time was set at 2d,4d,6d and 8d.Data showed that the degradation rate of fiber ranged from 3.0％～18.5％ after composting,and the maximum daily biogas production appears earlier.At the same time,biogas production does not change obviously.The longer the composting time lasts,the better the effect has.Treating effect of corn stalk with water is lower than that with digested effluent.The fermentation time and gas production have a good fitting effect of model.