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Study on the Efficiency of Algae Removal Using Ultrasonic Waves in Double Cisterns  

Sim, Joo-Hyun (Department of Environmental Engineering, Inha University)
Seo, Hyung-Joon (Department of Environmental Engineering, Inha University)
Kwon, Byung-Dae (Waterworks Headquarters, Incheon Metropolitan City)
Publication Information
Journal of Korean Society of Environmental Engineers / v.28, no.12, 2006 , pp. 1310-1315 More about this Journal
Abstract
This study examines algae removal and reduction using ultrasonic. Experiments were carried out on frequency: 28 kHz single-wave, 40 kHz multi-wave; intensity: 10, 15, 20, 25, 30 W/L; algae concentration: 500, 1000, 1700/ml; exposure time: 1, 3, 5, 7, 10, 15, 20 min. Also, We investigated algae removal and reduction in single cistern where raw water including algae was directly exposed to ultrasonic and in the double cisterns located in 4 cm from ultrasonic vibrator. The algae type used in this study was Melosira genus of Bacillariophceae. The Bacillariophceae is the representative algae which causes blockage of filter basin. Because of its resistance against oxidizers, it flows into the filter basin after sterilization. As a result of this study, the form of Bacillariophceae was completely destroyed and dissolved after the application of ultrasonic waves unlike the sterilization using oxidizers. Removal efficiency of algae using ultrasonic waves increased in proportion to intensity and exposure time of ultrasonic waves, and in double cisterns is better than single cistern.
Keywords
Drinking Water Treatment; Ultrasonic Wave; Algae; Double Cisterns;
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