中文摘要：

以小型生物电化学反应器为发酵装置,考察外加电刺激对餐厨垃圾-污泥共厌氧发酵过程中挥发性脂肪酸（volatile fatty acids,VFA）产量的影响。实验结果表明,餐厨垃圾协同污泥厌氧发酵,有利于体系中蛋白质和糖类的溶解消耗,提高VFA的产量。0.5 V微电刺激可增强厌氧体系中微生物的活性,有利于VFA的产出。第144和192小时,外加0.5V的实验组VFA浓度分别为24 342 mg·L^-1和21 291 mg·L^-1,高于其他实验组,较空白分别提高了30.8%和4.1%;其组成主要是乙酸、丙酸和戊酸。发酵进行第24 h和96 h时,0.5 V微电刺激厌氧发酵体系中溶解性糖类和溶解性蛋白质分别为722.4 mg·L^-1和1.49 g·L^-1,且有机物水解酸化过程中,厌氧体系内糖类先于蛋白质被消耗。

英文摘要：

The effects of electrostimulation on volatile fatty acid（ VFA） production from anaerobic cofermentation of food waste and activated sludge were investigated using a bench-scale bio-electrochemical reactor.The results showed that carbohydrate and protein hydrolysis increased and higher VFA yields were obtained when food waste and activated sludge were used for anaerobic co-fermentation. The microorganism＇s activity was highest under 0. 5 V direct electrical stimulation. Using this optimal condition,maximum VFA yields of 24. 342 g·L^-1and 21. 291 g·L^-1were achieved after 144 hours and 192 hours of fermentation,respectively,increases of30. 8% and 4. 1% compared with the blank control. VFA composition analysis showed that acetic,propionic,and valeric acids were the prevalent acids. The concentrations of soluble protein and soluble carbohydrate reached 722. 4 mg·L^-1and 1. 49 g·L^-1after 24 hours and 96 hours of fermentation,respectively. This demonstrates that carbohydrates are utilized prior to proteins during anaerobic cofermentation.