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采用批式实验,研究了(35±0.5)℃、搅拌速度65 r/min的厌氧消化体系中,p H值对玉米秸秆厌氧消化产甲烷的影响,分析了消化液相及固相特性的变化。结果表明,厌氧消化第7~9天时各系统VFA浓度均达到最大值,p H值为7和9时,挥发性脂肪酸(VFA)浓度显著高于其他系统,SCOD向VFA的转化效率较高。p H值为9时累积产气量增加速度最快,最大累计产气量达到134.33 m L/g VS。p H值为7时累计产气量最大,高达149.2 m L/g VS,是p H值为5和11系统的3.23和6.71倍。p H值为7和9时,沼气中甲烷的平均含量分别为64.1%和62.5%,比p H值为5和11的系统提高了约10%。p H值为7和9时VS去除率达到67.68%和58.87%,显著高于其他系统。控制厌氧消化p H值在7~9范围内可以有效提高木质纤维素生物质的产气效率。
The batch experiments were conducted to study the effect of p H value on the anaerobic digestion of corn stalks in the anaerobic digestion system of (35 ± 0.5) ℃ and stirring speed of 65 r / min. The digestion liquid phase and solid phase characteristics The change. The results showed that the concentrations of VFA in each system reach the maximum at 7-9 days after anaerobic digestion, the concentrations of VFA were significantly higher than those at other systems at p H of 7 and 9, and the conversion efficiency of SCOD to VFA was higher . When the p H value is 9, the cumulative gas production increases most rapidly and the maximum accumulated gas production reaches 134.33 m L / g VS. The cumulative gas production was the largest at p H of 7, up to 149.2 m L / g VS, which was 3.23 and 6.71 times p 5 of 5 and 11 systems. At p H values of 7 and 9, the average methane content in biogas was 64.1% and 62.5%, respectively, an increase of about 10% over systems with p H values of 5 and 11. VS removal efficiencies of 67.68% and 58.87% at p H values of 7 and 9 were significantly higher than those of other systems. Controlling the p H value of anaerobic digestion in the range of 7-9 can effectively increase the gas production efficiency of lignocellulosic biomass.