Department of Environmental Engineering, College of Environmental and Resource Sciences, Zhejiang University, Hangzhou 310058, China.
Bioresour Technol. 2013 Jan;128:533-8. doi: 10.1016/j.biortech.2012.10.121. Epub 2012 Nov 10.
The combined fermentation of sludge from the secondary sedimentation tank of municipal wastewater treatment plants and food waste enables not only waste reduction, but also the acquisition of volatile fatty acids (VFAs) for the biosynthesis of polyhydroxyalkanoates (PHAs). To better understand variables influencing the production of VFAs and PHAs, this study considered anaerobic fermentation of VFAs under different pH conditions. The production of VFA was the highest at an initial pH of 9.0, reaching 25,934 ± 1,485 mg COD/L and a VFAs/S COD ratio of 0.61 ± 0.04. When the fermentation liquid was used as a carbon source for PHA biosynthesis, continuous pulsed feeding resulted in the highest PHA synthesis rate of 64.5 ± 1.8%, while the culture receiving a one-time feeding had the lowest rate of only 51.5 ± 2.0%.
采用市政污水处理厂二沉池污泥与餐厨垃圾联合发酵，不仅可以实现废物减量化，还可以获得用于合成聚羟基烷酸酯（PHA）的挥发性脂肪酸（VFA）。为了更好地了解影响 VFA 和 PHA 生产的变量，本研究考虑了不同 pH 条件下的 VFA 厌氧发酵。初始 pH 为 9.0 时 VFA 的产量最高，达到 25,934 ± 1,485mg COD/L，VFAs/S COD 比值为 0.61 ± 0.04。当发酵液用作 PHA 生物合成的碳源时，连续脉冲进料导致最高的 PHA 合成速率为 64.5 ± 1.8%，而一次性进料的培养物的速率最低，仅为 51.5 ± 2.0%。
