FC-CTS微絮凝过滤控制三卤甲烷生成势研究

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Abstract Due to the high aromatization degree of dissolved organic matter (DOM) in Yellow River water, its removal by conventional coagulation-filtration process was ineffective. Therefore, this study analyzed the characteristics of DOM in effluent of sedimentation tank and investigated the effects of the ferric chloride (FC), chitosan (CTS) and ferric chloride-chitosan polymers (FC-CTS) micro-flocculation on the enhanced filtration efficiency. The results showed that the molecular weight of DOM in raw water was <1kDa and 3~10kDa, with hydrophobic acidic and hydrophilic neutral organics as the primary components. The 3D-EEM results indicated that the proportion of tryptophane proteins and soluble microorganism metabolites were high. The micro-flocculation filter dose with FC-CTS filter aid exhibited a better performance than FC and CTS. With FC-CTS ratio of 7:2(w.w) and the FC dosage of 0.7mg/L, the turbidity decreased to 0.124NTU, and the DOC removal rate was 31.37%. Meanwhile the hydrophobic and hydrophilic neutral organics in the molecular weight range of <3kDa and >10kDa were significantly eliminated, and the sum of the trihalomethanes formation potential concentration to limit value ratio was 0.744in the sand filter effluent. Under weak alkaline conditions, FC-CTS could be employed to enhance migration and adhesion of colloidal particles and organic matter to the filter media surface through adsorption electrical neutralization of iron hydrate ions and the polymer adsorption bridging of CTS. The proposed process can offer new insights and guide the application of an effective micro-flocculation filter process.

Key words： micro-flocculation enhance filtration ferric chloride-chitosan polymers organic matter fractions trihalomethanes formation potential

Received: 13 January 2023

PACS:

X703.5

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	Articles by authors
	WANG Shan
	LIU Jin-hu
	HUANG Xin
	XU Ying-xin
	ZHANG Ke-feng
	SHI Bao-you
	JIA Rui-bao

Cite this article:

WANG Shan,LIU Jin-hu,HUANG Xin等. Control of trihalomethanes formation potential by an innovative enhancement filter aid:ferric chloride-chitosan (FC-CTS)[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(8): 3994-4002.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I8/3994

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