矿化垃圾与碱性添加剂对餐厨垃圾发酵产氢的影响

Effects of Aged Refuse and Alkali Additive on Fermentative Hydrogen Production from Kitchen Waste

研究了不同配比的矿化垃圾与碱性添加剂对餐厨垃圾发酵产氢的影响。试验结果表明,矿化垃圾主要起种子菌作用,此外其高孔隙率和高阳离子交换能力可提高传质效果;而碱性添加剂则能够抑制耗氢菌活性,缓冲体系的pH。在矿化垃圾与碱性添加剂的协同作用下,餐厨垃圾与污泥进行联合发酵产氢,获得最大的氢气浓度为41%,氢气产率为95.8mL/gVS;产氢体系进行的主要是丁酸型发酵,且氢气的产生量与VFA的产生量直接相关;水解反应生成的有机酸进一步发酵转化为气相的过程成为发酵产氢的限制性步骤,只有在矿化垃圾和碱性添加剂的协同作用下,微生物才可将产生的大量有机酸迅速向气相转化。

The effects of different ratio of aged refuse to alkali additive on fermentative hydrogen production from kitchen waste were investigated. The results show that the aged refuse acts chiefly as a seed microbial inoculum, and the systematic mass transfer capacity can be enhanced due to high specific surface and cation exchange ability. Meanwhile, the alkali additive can inhibit the metabolism of hydrogen consumers and buffer the systematic pH. The maximum hydrogen concentration of 41% and hydrogen production capacity of 95.8 mL/gVS are obtained when aged refuse and alkali additive are used for fermentative hydrogen production from kitchen waste and sludge. The butyric acid fermentation is mainly performed in the hydrogen production system. The hydrogen production is directly related to the amount of VFA. The transformation of VFA to hydrogen is a decisive factor in fermentative hydrogen production. The hydrogen-producing bacteria can effectively realize the transformation of VFA to hydrogen under the synergism of aged refuse and alkali additive.