餐厨垃圾水热炭化产物分配规律及液固产物特性研究

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Abstract The food waste (FW) collected from a canteen was treated by hydrothermal carbonization (HTC) under three different process conditions: mild (180℃-1h), intermediate (220℃-2h) and severe (260℃-4h), to explore the effects of process severity on the distribution of HTC three-phase products and the characteristics of liquid and solid products. The results showed that the process severity significantly influenced the product distribution. With the increase of the process severity, the yield of hydrochar increased initially and then decreased, the yield of carbonization liquid decreased initially and then stabilized, while the yield of gas product kept increasing. However, despite of different process severities, the HTC products were mainly in the form of hydrochar (40.4%~52.1%), of carbonization liquid (38.3%~57.5%), with a small fraction of gas products (2.1%~13.3%). In addition, the process severity also significantly affected the characteristics of carbonization liquid and hydrochar. With the increase of the process severity, the pH level of the carbonization liquid gradually increased, while COD and sCOD gradually decreased, and the conductivity showed an initial decreasing and then increasing trend. Further qualitative analysis found that the carbonization liquid contained a variety of ketones, aldehydes and volatile fatty acids (VFAs). As the reaction intensity increased, the surface of the hydrochar became more rough and complex, and the specific surface area gradually increased. Meantime, the hydrothermal carbonization reaction contributed to the enrichment of the carbon element from the FW into the hydrochar, and the degree of enrichment increased remarkably with the increasing process severity. Due to the low ratios of H/C and O/C, the calorific values of hydrochar is 23.9MJ/kg, similar to the bituminous coal value of 28.3MJ/kg, and the high ignition temperatures from 267.5℃ to 302.3℃, the hydrochars produced from FW exhibited the potential of safe and clean fuel for energy production.

Key words： food waste hydrothermal carbonization product distribution hydrochar carbonization liquid

Received: 11 June 2021

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X703

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	ZHANG Ying
	GU Meng
	SUN Jie
	ZHOU Yi-ran
	ZHU Wei
	WANG Xiao-ming

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ZHANG Ying,GU Meng,SUN Jie等. The product distribution of hydrothermal carbonization of food waste and the characteristics of liquid-and solid-products[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(1): 239-249.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I1/239

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