堆肥预处理对稻秸厌氧发酵产气量的影响

Effect of compost pre-treatment on biogas production from rice straw

堆腐作为秸秆厌氧发酵的预处理技术已广泛使用,但堆腐也会使秸秆中部分有机物损失,了解堆腐损失有机物对秸秆总产气量的影响,可以更客观地评价堆腐预处理技术的可行性。该试验在室内中温(35℃)、总固体(TS)质量20%条件下,研究了稻秸堆肥预处理、添加猪粪对稻秸产沼气的影响,分析了堆肥预处理以及厌氧发酵前后稻秸组分的变化,估算了堆肥预处理对稻秸总固体质量产气量的损失。结果表明:稻秸堆肥预处理并不能增加稻秸产气量与甲烷含量,堆肥预处理使稻秸的半纤维素量损失了12%以上,从而降低了稻秸总固体质量产气量。厌氧发酵中稻秸半纤维素降解率最高,对稻秸产气贡献率最大。由此可见,堆肥预处理方式并不能提高稻秸厌氧发酵的产气量。

The method of compost as a pretreatment of rice straw for anaerobic digestion was used widely.The organic carbon content of the rice straw decreased during compost pretreatment.So it is necessary to understand the influence of the lost organic carbon on the total amount of biogas production,which will help us to objectively evaluate the availability of the pre-treatment of composting.Under the laboratory conditions of 35℃ andthe total solids（TS）content of 20%,the composition changes and rate of biodegradation of rice straw between treatments with compost pre-treatment and anaerobic fermentation were studied to determine the effects of compost pre-treatment of rice straw and addition of pig manure on biogas production.Results showed that compost pre-treatment of the rice straw didn＇t enhance biogas production and methane content for the hemicellulose content being decreased by more than 12%,consequently reduced the TS gas production.The decomposition rate of hemicellulose was the highest during the anaerobic fermentation,which was the main contributor of biogas production.As a result,method of composting pretreatment can not improve gas production with rice straw.