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研究报告

The effect of adding glycerin on volatile fatty acid production from anaerobic fermentation of food waste

摘要：餐厨垃圾厌氧发酵产生的挥发性脂肪酸（VFAs）可以作为合成聚羟基脂肪酸酯（PHA）的底物，PHA的性能与VFAs的组成密切相关.为改善PHA产品的性能，本文研究了甘油投加对餐厨垃圾产酸性能的影响.在餐厨垃圾厌氧消化半连续流反应器运行稳定的基础上，探讨了不同C/N对厌氧发酵有机物转化及VFAs产量和组成的影响.结果表明，投加甘油会降低发酵体系的pH，提高VFAs的产量，相比于对照组，C/N比为25/1时，VFAs产量提高了10.3%.C/N10.69/1（对照组）、15/1、20/1和25/1时，发酵液奇数碳VFAs所占总VFAs的比例分别为54.23%、61.16%、64.78%和66.79%.甘油的投加可以提升丙酸、戊酸等奇数碳VFAs所占比例，有利于改善PHA产品性能.

Abstract：Volatile fatty acids (VFAs) produced by anaerobic fermentation of food waste could be used to synthesize polyhydroxyalkanoate (PHA) production. There is a close relationship between the performance of PHA production and the composition of VFAs. In order to improve the performance of PHA products, this paper studied the effects of adding glycerin on the VFAs production from anaerobic fermentation of food waste. Based on the stable operation of semi-continuous reactor for anaerobic digestion of food waste, the effects of different C/N of food waste on transformation of organic matter and VFAs production and composition during the anaerobic fermentation were investigated. The results indicated that glycerin in food waste reduced the pH of reactor and increased the VFAs production, the maximum VFAs production was achieved at C/N ratio 25/1, which was increased by 10.3% compared to the control group. The ratio of odd carbon VFAs to total VFAs of the batch experiment achieved 54.23%, 61.16%, 64.78% and 66.79% when the C/N of the substrate was 10.69/1 (control group), 15/1, 20/1 and 25/1, respectively. Adding glycerin in anaerobic fermentation of food waste could increase the proportion of odd carbon VFAs such as propionic acid and pentanoic acids, which can improve product performance and quality.