不同配比污泥对玉米秸秆产气特性的影响

[目的]研究玉米秸秆不同接种物浓度下的产气特性,为秸秆在大规模沼气工程中的应用提供参考.[方法]以玉米秸秆为发酵原料,接种不同比例的厌氧污泥,采用批量发酵工艺,在38℃左右条件下进行厌氧发酵.[结果]经过50d的发酵后,秸秆中大部分物质可以得到分解.当厌氧污泥和秸秆比例为10∶3(两者TS比0.57、VS比0.46)、总TS浓度为10.16%时,秸秆产气效果最佳,TS产气率为370 mL/g,沼气中甲烷含量为56.04%.[结论]玉米秸秆发酵过程中,随接种污泥比例加大,秸秆的产气量和产气率逐渐升高,但接种量达到一定比例时,原料产气量和产气率升高不再明显.

Effect of different concentrations of anaerobic sludge on corn stalk biogas production

【Objective】This research studied the gas producing characteristics of corn stover under different inoculum concentration in order to provide reference for straw application in large scale biogas engineering. 【Method】Using the corn stalks as raw material for fermentation， different proportions of anaerobic sludge were vaccinated. Then， using the batch fermentation process， anaerobic fermentation was conducted under 38℃. 【Result】After 50 d of fermentation, most of materials in straw decomposed. When the ratio of anaerobic sludge and straw was 10∶3 （the TS rate was 0.57 and VS rate was 0.46 for both） and the total TS concentration was at 10.16%， the straw gasification effect was optimal， in which the gas production rate was 370 mL/g TS and the methane content of biogas was 56.04%. 【Conclusion】As the inoculation sludge percentage increased， the straw gas production quantity and gas production rate gradually increased， but when the inoculum size reached a certain ratio， increases on the raw biogas production and biogas production rate were no longer significant.