壳聚糖改性铝污泥对铜绿微囊藻的絮凝去除

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Abstract An alternative approach was developed in this study for algae (M. aeruginosa) removal by using chitosan-modified alum sludge, which is a by-product of water purification process in waterworks. The results showed that the chitosan and the alum sludge with a mass ratio of 1:50 had a good efficiency for algae flocculation. The optimal dosage of chitosan-modified alum sludge was 0.25g/L, while the resultant algal density (4.88×10⁶ cells/mL) and turbidity removal rates were 100% and 98.92%, respectively, after 30min sedimentation. The resultant flocs were complete and compact with a fractal dimension of 1.719. Through Zeta potential and SEM analysis, the algal removal process relies mainly on the dual-action of "electrical neutralization" and "adsorption bridging" between chitosan and the alum sludge, exhibiting convenient, fast and efficient feature, but requiring strict pH range of 7~9.5. The external NaCl or CaCl₂ did not affect the flocculation and sedimentation process when the ionic strength is low. Moreover, alum sludge exhibited good performance for phosphorus absorption, while the modified alum sludge had high ability for algae removal in freshwater and the potential for growth control. As a result, the developed technique achieved the goal of "waste used for pollution control".

Key words： M.aeruginosa alum sludge chitosan modification flocculation eutrophication

Received: 23 February 2021

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X524

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	Articles by authors
	ZHAO Xiao-hong
	YANG Yu-meng
	WANG Wen-ke
	PAN Ying
	XING Yue

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ZHAO Xiao-hong,YANG Yu-meng,WANG Wen-ke等. Chitosan modified alum sludge for alga M. aeruginosa removal by flocculation[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(10): 4677-4685.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I10/4677

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