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

XU Yiwen; JIANG Jianguo; LIU Nuo; YANG Meng; MENG Yuan

doi:10.16511/j.cnki.qhdxxb.2019.22.011

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Journal of Tsinghua University(Science and Technology) ›› 2019, Vol. 59 ›› Issue (7) : 558-566. DOI: 10.16511/j.cnki.qhdxxb.2019.22.011

ENVIROMENTAL SCIENCE AND ENGINEERING

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

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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.

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kitchen waste / organic waste / anaerobic co-digestion / pretreatment

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XU Yiwen, JIANG Jianguo, LIU Nuo, YANG Meng, MENG Yuan. Effects of pretreatments on anaerobic co-digestion of kitchen waste and other organic wastes[J]. Journal of Tsinghua University(Science and Technology). 2019, 59(7): 558-566 https://doi.org/10.16511/j.cnki.qhdxxb.2019.22.011

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