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정수장의 노후 급속 모래여과지 진단 및 개량

Diagnosis and Renovation of a Time-worn Rapid Sand Filter used for Drinking Water Treatment

  • 김상구 (부산시 상수도사업본부 수질연구소) ;
  • 박현석 (부산시 상수도사업본부 화명정수사업소) ;
  • 손희종 (부산시 상수도사업본부 수질연구소) ;
  • 이정규 (부산시 상수도사업본부 수질연구소) ;
  • 류동춘 (부산시 상수도사업본부 수질연구소) ;
  • 유평종 (부산시 상수도사업본부 수질연구소)
  • Kim, Sang-Goo (Busan Water Quality Institute, Busan Water Authority) ;
  • Park, Hyun-Seog (Hwamyung Water Treatment Plant, Busan Water Authority) ;
  • Son, Hee-Jong (Busan Water Quality Institute, Busan Water Authority) ;
  • Lee, Jeong-Gyu (Busan Water Quality Institute, Busan Water Authority) ;
  • Ryu, Dong-Choon (Busan Water Quality Institute, Busan Water Authority) ;
  • Yoo, Pyung-Jong (Busan Water Quality Institute, Busan Water Authority)
  • 투고 : 2016.04.29
  • 심사 : 2016.06.13
  • 발행 : 2016.07.31

초록

The H water treatment plant has been operating since 1982 and has had no renovation. It is assumed that the filters have been operated for more than 30 years and therefore are deteriorated. Many of the filters show an unequal state of air scouring during backwashing. For this study one filter, which was presumed most deteriorated among eighteen filters, was selected as a model filter for renovation. Some of the effects seen after renovation of the underdrain system were a lower average filtrated turbidity by approximately 0.02 NTU and an equal backwash state throughout the filter bed. Sand wash efficiencies by backwash before renovation of the underdrain system were 28%, 8%, and 5% at the surface, 50 cm depth, and 100 cm depth, respectively, and after renovation of the underdrain system were 94%, 26%, and 15%, respectively. The standard deviation of the effective sand size was 0.025-0.033 mm before renovation of the underdrain system and 0.002-0.011 mm after renovation of the underdrain system, meanings there was equal backwash pressure throughout the filter. Filtration time after renovation was approximately 2 times longer than before renovation.

키워드

참고문헌

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