Journal of Environmental Health Sciences (한국환경보건학회지)

Korean Society of Environmental Health (한국환경보건학회)
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Coagulation Control of High Turbid Water Samples Using a Streaming Current Control System

유동흐름 전류계를 이용한 정수장 고탁도 유입수 응집 제어 방법에 대한 연구

  • Nam, Seung-Woo (Department of Environmental Health, School of Public Health, Seoul National University) ;
  • Jo, Byung-Il (Department of Environmental Health, School of Public Health, Seoul National University) ;
  • Kim, Won-Kyong (Sam Bo Scientific Co., Ltd.) ;
  • Zoh, Kyung-Duk (Department of Environmental Health, School of Public Health, Seoul National University)
  • 남승우 (서울대학교 보건대학원 환경보건학과) ;
  • 조병일 (서울대학교 보건대학원 환경보건학과) ;
  • 김원경 (삼보과학) ;
  • 조경덕 (서울대학교 보건대학원 환경보건학과)
  • Received : 2012.03.29
  • Accepted : 2012.04.12
  • Published : 2012.04.30
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Abstract

Objectives: This study was aimed at determining the optimum coagulation dosage in a high turbid kaolin water sample using streaming current detection (SCD) as an alternative to the jar test. Methods: SCD is able to optimize coagulant dosing by titration of negatively charged particles. Kaolin particles were used to mimic highly turbid water ranging from 50 to 600 NTU, and polyaluminum chloride (PAC, 17%) was applied as a titrant and coagulant. The coagulation consisted of rapid stirring (5 min at 140 rpm), reduced stirring (20 min at 70 rpm), and settling (60 min). To confirm the coagulation effect, a jar test was also compared with the SCD titration results. Results: SCD titration of kaolin water samples showed that the dose of PAC increased as the pH rose. However, supernatant turbidity less than 1 NTU after coagulation was not achieved for high turbid water by SCD titration. Instead, a conversion factor was used to calculate the optimum PAC dosage for high turbid water by correlating a jar test result with that from an SCD titration. Using this approach, we were able to successfully achieve less than 1 NTU in treated water. Conclusions: For high turbid water influent in a water treatment plant, particularly during summer, the application of SCD control by applying a conversion factor can be more useful than a jar test due to the rapid calculation of coagulation dosage. Also, the interpolation of converted PAC dose could successfully achieve turbidity in the treated water of less than 1 NTU. This result indicates that an SCD system can be effectively used in a water treatment plant even for high turbid water during the rainy season.

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References

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