城市地表径流胶体与溶解性有机物结合特性

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Abstract To characterize the combination between colloids and dissolved organic matter (DOM) in urban runoff, the adsorption behaviors of both colloids and DOM under different pH conditions were examined to reveal its mechanisms. The results showed that the Langmuir model described the isothermal sorption of DOM by runoff colloids at different pH values better, and the maximum sorption capacity decreased gradually with an increase in pH. The maximum equilibrium adsorption capacity at pH 3 was 4.0 times more than that at pH 6. The absolute value of zeta potential of runoff colloids increased after adsorption with DOM and then the runoff colloids became more stable and easier to migrate. HoA and HoN are two main fractions in the runoff DOM and account for 35.0% and 24.3% of the total DOC concentration, respectively, and can be combined with runoff colloids most easily, implying that the DOM fractions with high molecular weight are more likely combined with runoff colloids. The combination between runoff colloids and DOM can be achieved through hydroxyl substitution, surface complexation and electrostatic attraction.

Key words： runoff colloids dissolved organic matter adsorption influencing factors

Received: 17 January 2022

PACS:

X143

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	Articles by authors
	LIU Dian-wei
	DU Xiao-li
	FU Xiao-yu
	CUI Shen-shen
	DAI Xin-yi

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LIU Dian-wei,DU Xiao-li,FU Xiao-yu等. Characteristics of the combination between colloids and dissolved organic matter in urban surface runoff[J]. CHINA ENVIRONMENTAL SCIENCECE, 2022, 42(8): 3690-3695.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2022/V42/I8/3690

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