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Environmental Engineering Research 2003;8(1): 15-21. DOI: https://doi.org/10.4491/eer.2003.8.1.015
ADVANCED TREATMENT FOR DRINKING WATER RESOURCE BY THE ULTRA RAPID COAGULATION PROCESS (KOREA)
Tai II Yoon, Chang Gyun Kim, and Jung Soo Park
Department of Environmental Engineering, Inha University, Inchon 402-751, Korea
Corresponding Author: Chang Gyun Kim ,Tel: +82-32-860-7715, Fax: +82-32-872-7734, Email: cgk@inha.ac.kr
Received: August 16, 2002;  Accepted: November 16, 2002.
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ABSTRACT
This study was performed to evaluate the applicability of the URC (ultra rapid coagulation) process in efficiently treating eutrophicated water that is to be used for drinking purposes. The results were compared to conventional coagulation-sedimentation processes via the use of jar testing. The injection of weighted coagulant additives (WCA), e.g. clay, bentonite and glass particles, significantly reduced the level of turbidity and aluminum concentrations. However, there was no significant removal of NOM (natural organic matter). Polymer addition reduced turbidity by up to 95% and UV254 absorbed material by as much as 10%. The addition of secondary sludge into the URC system decreased sand filter head loss to the lowest extent when compared to the conventional coagulation-sedimentation processes. In addition, Synedra acus, a seasonally found diatom in the water-uptake process, was removed by up to 95% and dissolved aluminum reduced to levels as low as 0.02 mg/L. However, there was no significant change in the UV254 of absorbed NOM. A pilot scale URC process was capable of efficiently treating rainfall run-off as demonstrated by the reduction of levels of aluminum to as low as 0.05 mg/L. The URC process can improve conventional water treatment systems as it has the advantages of removing residual aluminum and turbidity faster than the conventional processes, while maintaining a lesser extent of sand filter head loss.
Keywords: aluminum | NOM | sand filtration | ultra rapid coagulation (URC) | UV254 | weighted coagulant additives (WCA)
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