Title: Ultrasonic removal of cyanobacteria

Authors: Guangming Zhang, Bo Wang, Hongwei Hao, Minsheng Wu

Addresses: Shenzhen Graduate School, Tsinghua University, Shenzhen, 518055, P.R. China. ' Shenzhen Graduate School, Tsinghua University, Shenzhen, 518055, P.R. China. ' Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China. ' Department of Mechanical Engineering, Tsinghua University, Beijing 100084, P.R. China

Abstract: This paper studies the ultrasonic removal of cyanobacteria. The results show that ultrasound is an effective way to reduce the water turbidity and to damage chlorophyll a, the antenna complex. Furthermore, 55% of the cyanobacteria were removed after 5 min treatment and no rebound was observed after 3 h. The ultrasonic cyanobacteria removal followed a pseudo first-order reaction and the rate constant was 0.173/min. The optimal working power was 20 W, and extra power input brought in little benefit.

Keywords: cyanobacteria; ultrasonic removal; ultrasound; cyanobacterial blooms; eutrophic water; eutrophic lakes; drinking water; water treatment; water quality.

DOI: 10.1504/IJETM.2004.005586

International Journal of Environmental Technology and Management, 2004 Vol.4 No.3, pp.266 - 272

Available online: 21 Oct 2004 *

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