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在中温(35±1)℃条件下,以水花生和麦秸为发酵原料,研究了其单独和在不同干物质配比(水花生与麦秸比例为21.67:1、7.50∶1和4.23∶1)下的厌氧发酵产气特性。结果表明,当发酵原料总固体(TS)负荷为8%、接种沼液量为20%,水花生和麦秸干物质配比为7.50∶1时产气效果最好,TS和挥发性固体(VS)产气率分别为325.98±4.03 ml/g和437.12±5.01 ml/g,容积产气率为0.36±0.01/d,甲烷含量为60.53±1.09%。VS降解率与日均产气量、TS产气率、VS产气率、容积产气率和沼液总有机碳(TOC)变化率等五项指标均呈极显著正相关性(p<0.01),而其与甲烷含量的正相关性及沼液挥发性脂肪酸(VFA)变化率的负相关性不显著(p>0.05)。水花生与麦秸混合发酵可以提高沼气的产量,并在一定程度上使厌氧发酵过程提前达到产气高峰,具有较好的可行性。
Under the medium temperature (35 ± 1) ℃, peanut and wheat straw were used as the raw materials to study the effects of water and peanut on the ratio of dry matter to the dry matter (ratio of water peanut to wheat straw 21.67: 1, ratio 1.50:1 and 4.23:1) Under the anaerobic fermentation gas production characteristics. The results showed that when the total TS load of fermentative material was 20%, the volume of biogas slurry was 20%, the gas production was the best when the ratio of dry matter of peanut and wheat straw was 7.50:1, and the effect of TS and volatile solids ) Gas production rates were 325.98 ± 4.03 ml / g and 437.12 ± 5.01 ml / g, respectively. The volumetric gas production rate was 0.36 ± 0.01 / d and the methane content was 60.53 ± 1.09%. The degradation rate of VS was significantly and positively correlated with the daily average gas production, the TS gas production rate, the VS gas production rate, the volume gas production rate and the change rate of total organic carbon (TOC) of biogas slurry (p <0.01) , While the negative correlation between the positive correlation with methane content and VFA rate was not significant (p> 0.05). The mixed fermentation of peanut and wheat straw can increase the yield of biogas, and to a certain extent make the anaerobic fermentation process reach the peak of gas production ahead of schedule, which has a good feasibility.