Effect of Substrate Concentration on Methane Fermentation of Cattle Dung

J. A. Kumar, He Junguo, Li Jianzheng, Zheng Guocheng
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引用次数: 11

Abstract

Methane fermentation of cattle manure (CM) with different total solid contents were conducted in the laboratory-scale batch reactors (2.5 L volume) in order to determine the substrate concentration performance and potential energy recovery at the optimal mesophilic (35 oC) and thermophilic (55 oC) temperatures. The three reactors containing CM and water in the ratios (w/w) of 1:1 (wet fermentation), 2:1 and 1:0 (undiluted manure, dry fermentation) were utilized for the both conditions. The work was performed for a period of 63 days to compare the volatile solids and dissolved organic carbon degradation, COD removal, and VFAs. The results showed that the specific biogas yields, in terms of per kilogram of CM, were 41.68, 43.72 and 44.98 L/kg with 22.61, 23.69 and 24.96 L/kg methane contents respectively for the ratios of 1:1, 2:1 and 1:0 at 35 oC, while 43.03, 44.89 and 45.71 L/kg biogas with 23.45, 24.15 and 25.57 L/kg methane contents respectively for the ratios 1:1, 2:1 and 1:0 at 55 oC. The volume of the digester was increased in the wet fermentation for the same loading rate. Though water and thermophilic condition could promote the startup process and the biodegradability of the substrate, the total biogas and methane yields in the dry fermentation were found comparable to the conventional process (wet fermentation).
底物浓度对牛粪甲烷发酵的影响
在实验室规模间歇式反应器(体积为2.5 L)中,对不同固体总含量的牛粪(CM)进行了甲烷发酵,以确定最佳中温(35℃)和亲热(55℃)温度下的底物浓度性能和势能回收率。在三个反应器中,CM与水的比例分别为1:1(湿发酵)、2:1和1:0(未稀释的粪便,干发酵)。这项工作进行了63天,比较了挥发性固体和溶解性有机碳的降解、COD去除和VFAs。结果表明:在35℃条件下,1:1、2:1和1:0条件下,每千克CM的比产气量分别为41.68、43.72和44.98 L/kg,甲烷含量分别为22.61、23.69和24.96 L/kg;在55℃条件下,1:1、2:1和1:0条件下,每千克CM的比产气量分别为43.03、44.89和45.71 L/kg,甲烷含量分别为23.45、24.15和25.57 L/kg。在相同的装载率下,湿式发酵增加了蒸煮池的体积。虽然水和亲热条件可以促进发酵的启动过程和底物的生物降解性,但干发酵的总沼气和甲烷产量与传统工艺(湿发酵)相当。
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