BAC工艺中活性炭去除重金属机理研究——以Pb(II)为例

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Abstract In order to reduce or avoid the generation of a large amount of hazardous wastes-spent biological activated carbon (SBAC) in the whole life cycle of BAC process, a 280-day comparative test of four activated carbon columns (LBC-Y, HBC-Y, LBC-O₃, HBC-O₃) with or without ozone oxidation in the influent water were carried out using two indicators of activated carbon (LBC and HBC). The mechanism of removing heavy metal Pb (II) by SBAC was studied through regular samplings of different activated carbon columns. The results showed that the removal performance of Pb (II) by SBAC with different activated carbon columns decreased for a short time and then continuously increased. The adsorption capacity of four different activated carbon columns for Pb (II) first decreased from about 6~7mg/g (virgin carbon) to about 1~2mg/g, and then gradually increased and far exceeded the initial adsorption capacity of virgin activated carbon. The comparative adsorption experiments of inactivated and retained biofilms showed that the presence or absence of microorganisms had no significant effect on the adsorption of Pb (II) by SBAC. Combined with the surface characterization (including pH, isoelectric point, surface functional groups, elemental analysis, etc.) and Pb (II) removal performance of SBAC from different activated carbon columns, the two-stage heavy metal removal mechanism of SBAC in BAC process was found:the initial alkaline precipitation (0~60days) and the subsequent ion exchange and acid functional group complexation, which realize the circulation and reasonable reuse of SBAC in the whole life cycle.

Key words： biological activated carbon SBAC heavy metal removal mechanism recycling and reusing

Received: 13 September 2022

PACS:

X703.1

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	Articles by authors
	DONG Li-hua
	YANG Xiao-hong
	CHEN Zhi-ying
	SONG Chen
	PAN Shu-jie
	HAN Ying-jie
	ZHANG Guang-hui
	HOU Li-an
	KANG Ya

Cite this article:

DONG Li-hua,YANG Xiao-hong,CHEN Zhi-ying等. Mechanism of heavy metal removal by spent activated carbon in BAC process-Pb(II) example[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(5): 2228-2238.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I5/2228

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