pH对水稻秸杆发酵产酸特性的影响

Influence of pH on Fermentation of Rice Straw

采用锥形瓶反应器及室内培养方法,研究pH对水稻秸杆厌氧产酸的影响。结果表明,酸化产物的组成与pH有关,乙酸和丁酸在不同的pH值下总为主要产物;pH>7时,明显有丙酸生成;酸化的最佳pH值为7,此条件下挥发性脂肪酸(VFA)的产量最高可达11.634 g/L,总固体(TS)的去除率可达51%。

selective production of rice straw by anaerobic acidogenesis with pH control was examined in the present study. The results in this study showed that the product spectrum in the acidic reactor was strongly depended on control pH. Acetic and formic were the main products under different cultural pH, while propionic acid was apparently produced under the basic condition, and the butyric acid was examined obviously under acidic and neutral conditions. Additionally, the optimum pH was found to be 7, under which, the production rate of volatile fatty acids（VFA） was 11.634 g/L, and remove rate of TS was 51%. The control of cultural pH was considered to be a useful way in controlling product spectrum in the anaerobic acid reactor.