Effects of pretreatments on anaerobic co-digestion of kitchen waste and other organic wastes
XU Yiwen1, JIANG Jianguo1,2, LIU Nuo1, YANG Meng1, MENG Yuan1
1. School of Environment, Tsinghua University, Beijing 100084, China; 2. Key Laboratory for Solid Waste Management and Environment Safety of Ministry of Education, Tsinghua University, Beijing 100084, China
Abstract：The effects of different pretreatments including ultrasound, microwave and alkali thermal pretreatments on anaerobic co-digestion of kitchen waste and other organic wastes were studied through biochemical methane potential (BMP) experiments. The experiment without pretreatment served as the control. After the pretreatments, some of the primary organics are solubilized by hydrolysis and liquefaction reactions resulting in higher concentrations of volatile fatty acids (VFA), soluble chemical oxygen demand (SCOD) and total ammonia nitrogen (TAN) which improve the efficiency of the subsequent anaerobic co-digestion. The BMP results show that the pH and VFA, SCOD and TAN concentrations in the four experiments all have the same trend and gradually stabilize after 6 days, indicating that the biodegradable organics in the substrate are completely decomposed in a short time. In addition, the pretreatments improve the biogas production rate. Ultrasonic pretreatment increases the methane yield from 285 mL/g VS to 324 mL/g VS, which is consistent with the modified theoretical methane yield, while microwave and alkali thermal pretreatments inhibit anaerobic fermentation.
徐一雯, 蒋建国, 刘诺, 杨梦, 孟园. 预处理对厨余垃圾等有机废弃物联合厌氧发酵的影响[J]. 清华大学学报（自然科学版）, 2019, 59(7): 558-566.
XU Yiwen, JIANG Jianguo, LIU Nuo, YANG Meng, MENG Yuan. Effects of pretreatments on anaerobic co-digestion of kitchen waste and other organic wastes. Journal of Tsinghua University(Science and Technology), 2019, 59(7): 558-566.
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2019, Vol. 59 
