不同原料配比对厌氧发酵过程中产气量VFA和脱氢酶活性的影响

以牛粪和小麦秸秆为发酵原料,研究了不同牛粪(M)与小麦秸秆(S)的干物质配比(牛粪与秸秆的比例为1∶1、2∶1和3∶1)对厌氧发酵产气过程的影响。结果表明,添加小麦秸秆处理的产气量显著高于秸秆与牛粪单独发酵处理(P<0.05),其中牛粪与秸秆的配比是1∶1的产气量为(31823.7±691.2)mL,比秸秆、牛粪以及牛粪与秸秆比例为2∶1和3∶1四个处理的产气量分别提高了208.7%、11.5%、2.8%和5.2%。因此,以M∶S=1∶1进行混合厌氧发酵效果最好。挥发性脂肪酸(VFA)与日产量间呈极显著性正相关(P<0.01),但脱氢酶活性与产气量相关性不显著(P>0.05)。

Effects of Different Rations of Materials on Biogas Production, VFA and the Activity of Dehedrogenase During Anaerobic Process

The effects of different ratios of cow manure and wheat straw, which were wheat straw alone(S), cow manure alone(M), the mass ratio of cow manure to wheat straw of 1∶1(M∶S=1∶1), the mass ratio of cow manure to wheat straw of 2∶1(M∶S=2∶1) and the mass ratio of cow manure to wheat straw of 3∶1(M∶S=3∶1), on anaerobic digestion for biogas production were examined. The results indicated that the biogas production of the test of cow manure and wheat straw were larger than the that of the wheat straw alone and the cow manure alone, respectively. The highest biogas production was observed in M∶S=1∶1 with (31 823.7±691.2) mL. The total biogas production of the test of M∶S=1∶1 increased by 208.7%, 11.5%, 2.8%, 5.2%, compared with wheat straw alone, cow manure alone, and the mass ratio of cow manure to wheat straw was 2∶1 and 3∶1 respectively. The result of this study showed that the best of biogas production was M∶S=1∶1. Meanwhile, there was a significant positive correlation between the VFA and daily biogas production. However, the correlation between the dehedrogenase activity and daily biogas productions was not significant.