新型硫酸铝-壳聚糖助滤剂强化砂滤效能研究

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Abstract

A combination of aluminum sulfate (AS) and chitosan (CTS) was used as an innovative filter additive, namely AS-CTS, to enhance the filtration. The properties of the trapped organics were analyzed by molecular weight fractionation and three-dimensional fluorescence spectroscopy, and the mechanism of enhanced filtration by AS-CTS was preliminarily investigated via the analysis of zeta potential, floc size, and fractal dimension. The results indicated that AS-CTS strengthened the filtration much more than AS or CTS alone. Under the optimum condition (AS/CTS mass ratio of 2/1, CTS dosage of 0.3mg/L, rotation speed of 300r/min, and stirring time of 2min) the effluent turbidity was 0.1NTU, particulate matter was 125/mL, residual aluminum concentration was 0.02mg/L. The turbidity and particulate matter removal rate was respectively 58% and 61.7% higher than that without AS-CTS. It was found that AS-CTS enhanced filtration could effectively remove hydrophobic humic acid with molecule weight > 30KDa, tryptophan protein with molecule weight between 1and 3KDa, soluble microbial metabolites, and fluvic-like acid. AS-CTS could increase the adhesion of colloidal particles on the surface of the filter media, mainly through the polymer bridging and interface chemistry, and enhanced the migration of particles to the surface of filter media by forming larger micro-flocculant in size and fractal dimension.

Key words： aluminum sulfate-chitosan polymers dual-micro-coagulation enhance granular filtration Zeta potential fractal dimension

Received: 03 March 2019

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X703.5

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	Articles by authors
	WANG Shan
	ZHANG Ke-feng
	LI Xing-guo
	JIA Rui-bao

Cite this article:

WANG Shan,ZHANG Ke-feng,LI Xing-guo等. Enhancement sand filtration by an innovative filter aid: aluminum sulfate-chitosan (AS-CTS)[J]. CHINA ENVIRONMENTAL SCIENCECE, 2019, 39(9): 3780-3788.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2019/V39/I9/3780

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