Effects of pretreatments on anaerobic co-digestion of kitchen waste and other organic wastes

被引：0
|
作者：
Xu Y. [1 ]
Jiang J. [1 ,2 ]
Liu N. [1 ]
Yang M. [1 ]
Meng Y. [1 ]
机构：
[1] School of Environment, Tsinghua University, Beijing
[2] Key Laboratory for Solid Waste Management and Environment Safety of Ministry of Education, Tsinghua University, Beijing
来源：
Qinghua Daxue Xuebao/Journal of Tsinghua University | 2019年 / 59卷 / 07期
关键词：
Anaerobic co-digestion; Kitchen waste; Organic waste; Pretreatment;
D O I：
10.16511/j.cnki.qhdxxb.2019.22.011
中图分类号：
学科分类号：
摘要：
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. © 2019, Tsinghua University Press. All right reserved.
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页码：558 / 566
页数：8
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