상하수도학회지 (Journal of Korean Society of Water and Wastewater)

  • 제23권1호
  • /
  • Pages.39-46
  • /
  • 2009
  • /
  • 1225-7672(pISSN)
  • /
  • 2287-822X(eISSN)
대한상하수도학회 (The Korean Society of Water and Wastewater)
권호 표지

폴리염화알루미늄 과량주입에 의한 고(高) pH 원수의 수처리효율 개선

Improvement of Water Treatment Efficiency by Poly Aluminum Chloride Overdosing in High pH Raw Water

  • 임재철 (한국수자원공사 동두천수도서비스센터) ;
  • 김진근 (한국수자원공사 수도관리처)
  • 투고 : 2008.07.01
  • 심사 : 2009.01.30
  • 발행 : 2009.02.15
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초록

A method to improve water treatment efficiency by coagulant overdosing for high pH raw water at a drinking water treatment plant (WTP) which had no pH adjusting facilities was investigated. Poly aluminum chloride (PACl) was used for coagulant, and turbidity removal efficiency was evaluated as a function of PACl dosage increases. pH and turbidity of supernatant of jar-tester were 7.10 and 0.50 NTU respectively, when the turbidity, pH, alkalinity, water temperature, conductivity of raw water were 1.75 NTU, 9.38, 46.5 mg/L, $6.4^{\circ}C$, $400{\mu}s/cm$, respectively. Turbidity of settled water was reduced from 2.18 NTU to 0.28 NTU (87% reduction) when PACl dosage was increased from 16 mg/L to 45 mg/L at a full scale WTP. This can be attributed to the recovery of coagulant efficiency by pH reduction with the increase of coagulant dose, however coagulation efficiency was reduced with the formation of Al(OH)4- by PACl addition at higher pH. Coagulant overdosing was proven to be a rapid and effective method for high pH raw water, which can be applied at drinking WTP.

키워드

참고문헌

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