Journal of Korean Society on Water Environment (한국물환경학회지)

Korean Society on Water Environment (한국물환경학회)
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Field Study of Water Quality Improvement by Circulation, Sonication and Ozonation

수류확산과 초음파와 오존을 이용한 현장 수질 개선 평가

  • 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))
  • 테킬안디넷 (과학기술연합대학원대학교 건설환경공학과) ;
  • 김일호 (한국건설기술연구원 환경플랜트연구소) ;
  • 이재엽 (한국건설기술연구원 환경플랜트연구소)
  • Received : 2016.10.12
  • Accepted : 2017.03.20
  • Published : 2017.03.30
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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.

본 연구에서는 수원 여천천에서 원천저수지로의 유입부 정체수역에 수류확산장치, 초음파와 오존 처리를 구성한 시스템이 수질에 미치는 영향을 항목 단위로 조사하였다. 샘플링은 기기 운전 전과 이후 1, 3, 6 시간에 여섯 지점에서 수집되었다. 수류확산장치만을 작동하였을 때, 용존산소는 80%까지 감소하였고, Chl-a는 하류 25m에서 3시간 후 90%까지 감소했다. 초음파를 병행한 경우에는 장치로부터 100 m 거리까지 Chl-a가 80% 이상 제거되었다. 한편 총 용존 인은 초음파 처리 전 $420({\pm}70){\mu}g/L$에서 처리 후 $160({\pm}40){\mu}g/L$까지 감소되었다. 수류확산장치와 초음파에 오존을 처리한 결과, Chl-a는 암모니아성 질소가 $60{\mu}g/L$에서 $20{\mu}g/L$으로 감소하였다. 오존의 경우 안전을 위해 $3{\times}10^{-3}mg/L$ 및 짧은 반응 시간으로 적용하였으나 시스템에 의한 장치 구성이 오존을 비롯한 처리를 통합하는 효과를 낼 수 있었다. 본 연구로부터 수류확산장치와 초음파 가 보여준 Chl-a의 탁월한 처리 성능은 녹조 형성을 방지하는 효과적인 방안으로 제시될 수 있다.

Keywords

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