pH值对水稻秸秆厌氧发酵产沼气的影响

Effect of pH Value on Biogas Production by Anaerobic Fermentation of Rice Straw

[目的]研究pH值对水稻秸秆厌氧发酵产沼气的影响,为促进秸秆发酵产沼气提供试验参数和理论依据。[方法]从产物生成、催化剂活性和原料利用3个方面评价不同发酵起始pH值对沼气产生的影响。[结果]在发酵液起始pH值为7.0时,稻草秸秆发酵产沼气的量最高,发酵液TS、VS降低程度最大,分别为29.2%和24.6%,且产气过程中辅酶含量也最大。[结论]控制发酵体系的pH值(7.0～7.2),使产甲烷菌处于最佳的生存状态,是提高水稻秸秆发酵产沼气的关键。

[ Objective ] The aim was to research the effect of pH value on biogas production by anaerobic fermentation of rice straw,and provide test parameter and theoretical basis for promoting straw fermentation to produce biogas. [ Method] Effect of initial pH value on biogas production was evaluated from 3 aspects ,biogas production ,activity of biocatalyst and material consumption. [ Result ] The result showed that when the pH value was 7.0, the biogas production of rice straw was the highest, the decreased extent of TS and VS more significant, and coenzyme content was also the highest during the process of biogas production. [ Conclusion ] Controlling the pH value of fermentation system （7.0 -7.2） and making the producing methane strain at the optimal living state,which were the key to enhance rice straw fermentation to produce biogas.