烷基多苷对餐厨垃圾干式厌氧发酵的影响

Effect of alkylpolyglycoside on dry anaerobic fermentation of food waste

近年来,餐厨垃圾厌氧发酵生产挥发性脂肪酸(VFA)得到广泛的研究,水解反应是餐厨垃圾厌氧发酵的限速步骤。利用生物表面活性剂——烷基多苷(APG)强化餐厨垃圾厌氧发酵生产VFA,考察了APG投加量对餐厨垃圾干式厌氧发酵的影响,分析了APG对餐厨垃圾厌氧发酵的强化机制。结果表明,APG的最佳投加量为0.5g/L,在此投加量下VFA的最大累积量为18.5g/L,VFA的转化率为38%;APG能够强化餐厨垃圾的水解反应,使溶解性蛋白质和溶解性多糖含量明显增加,为后续产酸细菌提供了更多的发酵基质。APG自身分解对VFA有一定贡献,但贡献量远远小于餐厨垃圾的产生量。

Recent ly,the production of volatile fatty acids （VFA） from anaerobic fermentation of food waste has earned much attention. However,the hydrolysis process of food waste anaerobic fermentation is considered as the limiting step. This work used the bio-surfactant,alkylpolyglycoside （APG） ,to enhance VFA production of food waste anaerobic fermentation, investigated the effect of APG dosage on dry anaerobic fermentation of food wasteland analyzed the mechanism. Results showed that the optimal APG dosage was 0.5 g/L,the maximum VFA production was 18.5 g/L,and the conversion rate of VFA was 38%. APG improved the process of hydrolysis, incereasing the content of soluble protein and soluble polysaccharide significantly, which provided more fermentation substrates for subsequent acid producing bacteria. Further experimental results showed that the decomposition of APG could cause VFA generation, whereas this value was rather less than that from food waste anaerobic fermentation.