| Title |
Field Study of Water Quality Improvement by Circulation, Sonication and Ozonation |
| Authors |
테킬안디넷 ( Andinet Tekile ) ; 김일호 ( Ilho Kim ) ; 이재엽 ( Jai-yeop Lee ) |
| DOI |
https://doi.org/10.15681/KSWE.2017.33.2.170 |
| Keywords |
Algal bloom; Jet flow; Ozone; Stagnant; Ultra-sonication; Water quality |
| Abstract |
This study used jet water flow, ultrasonication, and ozonation units to investigate the impact of the unit components on the water quality of the stagnant Yeo-cheon River in Korea. Samples were collected at six locations, before the experiment and at 1, 3, and 6 hrs afterward. By operating the water-flow unit only, dissolved oxygen increased by as much as 90% after 3 hrs, 25 m downstream from the device, and Chi-a was reduced by 80%. With sonication added, more than 80% of the ChI-a was removed, even at 100 m downstream from the device. In addition, total dissolved phosphorus was reduced from an average value of 420 (± to μg/L before ultrasonic irradiation to 160 (±40) \μ/L afterward. By releasing ozone into the flow with sonication, ChI-a was greatly removed from the water column, and ammonia nitrogen also decreased, to an average value of 20 n column 60 μg/L. However, because only 3*10-3 mg/L of ozone was used for safety reasons, and because of its brief reaction time, the effect of integrating ozone into the system covered only a small area. Generally, combining sonication with jet flow is promising for preventing algal bloom formation, because it effectively removed Chi-a from the water column. |