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中文摘要：
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。
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