不同麦秆生物炭强化餐厨垃圾厌氧消化

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Abstract In this study, different types of wheat straw biochars (WBC) were prepared from wheat straw (WS) at different pyrolysis temperatures and KOH modified concentrations to clarify the effects of biochar preparation conditions on its properties and anaerobic digestion. It was observed that a lower pyrolysis temperature could protect the functional groups on the surface of WBC, while a higher pyrolysis temperature could increase the specific surface area, pore volume, and average pore size of WBC. KOH modification can introduce -OH to the surface of WBC and affect the specific surface area, pore volume, and average pore size of WBC to some extent. The WBCs were added to the kitchen waste anaerobic digestion (KWAD) system, and all WBCs were found to increase the total biogas production of KWAD, of which both WS650 and WS450-2 had the most significant promotion effect, increasing the total biogas production by 32.82% and 30.01%, respectively, compared with CK. In view of key enzyme activities, the coenzyme F420 and dehydrogenase activities of WS450-2 were found to be greatly enhanced, which may be related to the abundance of its functional groups on the surface. And the WS450-2 showed a greater advantage in enriching Firmicutes and suppressing unrelated bacteria, while WS650 in enriching Methanosarcina and suppressing unrelated archaea. Finally, there was the correlation of both the preparation process and characterization indexes of WBC with the KWAD biogas production kinetic parameters, process parameters, enzyme activity, and microbial abundance. That the KOH modified WBC could affect biogas production by adjusting volatile fatty acids and pH; and its larger pore volume and specific surface area could better enrich Firmicutes, while the high-temperature pyrolysis of WBC could better enrich Methanosarcina.

Key words： kitchen waste anaerobic digestion modified biochar functional group key enzyme activities microbial community

Received: 08 October 2022

PACS:	X705
	X799.3

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	Articles by authors
	SHANG Ze-zhou
	SHENG Chen-jing
	WANG Rui
	ZHANG Xi-yi
	SONG Jing-hui
	WANG Xiao-jiao
	YANG Gai-he
	FENG Yong-zhong
	REN Guang-xin
	HAN Xin-hui
	REN Cheng-jie
	WANG Xing

Cite this article:

SHANG Ze-zhou,SHENG Chen-jing,WANG Rui等. Anaerobic digestion of food waste enhanced by different wheat straw biochars[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2381-2392.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2381

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