Application of Chitosan in Removing Algae by Dissolved Air Flotation

Yu Heng Wang; Sheng Guang Zhuo; Yi Xin Yang; Na Li

doi:10.4028/www.scientific.net/AMR.347-353.1911

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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 347-353Application of Chitosan in Removing Algae by...

Application of Chitosan in Removing Algae by Dissolved Air Flotation

Abstract:

Using polyaluminium chloride (PAC) and chitosan as the main coagulant and coagulant-aid respectively, the high algae-laden water was treated by coagulation/flocculation/dissolved air flotation (C/F/DAF). When the doses of PAC and chitosan were both moderate (7.0~8.4 mg Al2O3/L of PAC and 0.6~1.0 mg/L of chitosan), the removal rates of turbidity, algae cells and TOC were all increased apparently compared with adding PAC alone. Especially, the residual aluminum concentration reduced significantly in treated water with the aid of chitosan. The structrue and strength of flocs formed by coagulation aid of chitosan were improved obviously, which proved that addition of chitosan could enhance the flocculation performance of PAC. So, in C/F/DAF process for removing algae, using chitosan as coagulant-aid can improve the flotation performance and reduce residual aluminum concentration in treated water.

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Periodical:

Advanced Materials Research (Volumes 347-353)

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1911-1916

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.347-353.1911

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October 2011

Authors:

Yu Heng Wang, Sheng Guang Zhuo, Yi Xin Yang, Na Li

Keywords:

Chitosan (CS), Coagulation/Flocculation/Dissolved Air Flotation (C/F/DAF), Floc Strength, Floc Structure, Polyaluminium Chloride (PAC)

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