Journal of Environmental Biology

Removal of algae from raw water by ultrasonic irradiation

and flocculation: A pilot scale experiment

Guozhong Yu*, Chengmei Zhao, Bing Liu, Qingfei Li and Hui Gao

School of Urban and Environmental Science, Xinyang Normal University, Xinyang, 464000, China

*Corresponding Author email : ygz1966@163.com

Publication Data

Paper received:

17 June 2012

Revised received:

12 August 2012

Accepted:

29 August 2012

Abstract

Using Chl a removal rate as index, a 28 kHz/900w ultrasonic cleaning machine was applied to testify algal removal by ultrasonic irradiation from raw water of a pool, where Microcystis aeruginosa colonies is absolutely dominated with temperature being over 20oC, and the irradiation lasted for 5 min. PAC was used as flocculant at the dose of 60 mgl^-1, jar tests were done to investigate the Chl a removal by flocculation. The results showed that ultrasound raised the water temperature instantly but did not lead to a regular pH change pattern in all the treated samples. Ultrasound could remove more than 90% of Chl a from raw water with temperature over 31oC, but less than 20% of Chl a or even increased Chl a concentration in some samples with temperature lower than 31 oC. Compared with the algal removal effects by direct raw water flocculation with PAC, ultrasound did not enhance markedly the flocculation effects on algae removal, which was not in agreement with the findings reported. The reason might be due to morphology and characteristics of natural algae differed greatly from that of algae cultured in laboratory.???????

Key words

Ultrasonic irradiation, Algal removal, PAC flocculation, Pilot experiment, Raw water

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