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http://dx.doi.org/10.15681/KSWE.2017.33.2.170

Field Study of Water Quality Improvement by Circulation, Sonication and Ozonation  

Tekile, Andinet (Department of Construction Environment Engineering, University of Science and Technology)
Kim, Ilho (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology (KICT))
Lee, Jai-Yeop (Environmental and Plant Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology (KICT))
Publication Information
Journal of Korean Society on Water Environment / v.33, no.2, 2017 , pp. 170-180 More about this Journal
Abstract
The study used jet water flow, ultra-sonication and ozonation system units to investigate impact of the unit components on water quality of stagnant Yeo-cheon River reach, Korea. Samples were collected at six locations, before operation and after 1, 3 and 6 hrs of operation. By operating the water flow unit only, dissolved oxygen increased as high as 90% after 3 hr at 25 m downstream of the device and Chl-a was reduced by 80%. Incorporating sonication, greater than 80% of Chl-a was removed even at 100 m distance from the device. Besides, total dissolved phosphorus was reduced from an average value of $420({\pm}70){\mu}g/L$ before ultrasonic irradiation to $160({\pm}40){\mu}g/L$ after the treatment. Releasing ozone into the flow with sonication, Chl-a was considerably removed from the water column and ammonia nitrogen was also decreased to average value of $20{\mu}g/L$ from $60{\mu}g/L$. However, as only $3{\ast}10^{-3}mg/L$ of ozone was used for safety purpose and due to brief reaction time it takes, effect of integrating ozone to the system covered limited area. Generally, combining sonication to jet flow is promising in preventing algal bloom formation since it has effectively removed Chl-a from the water column.
Keywords
Algal bloom; Jet flow; Ozone; Stagnant; Ultra-sonication; Water quality;
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Times Cited By KSCI : 2  (Citation Analysis)
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