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DOI : ,    Vol.5, No.1, 31 ~ 44, 1997
Title
Characteristics of Water Quality and Pollutant Loading in Urban Small Stream during Weekdays and Weekend
김동수Dong Su Kim,조경숙Kyoung Suk Cho,이종목Chong Mok Lee
Abstract
A study has been conducted for the coagulation characteristics of suspended solids made up of kaolin using Al-based inorganic polymeric coagulants, PACS (Poly Aluminium Chloride Silicate) and PASS (Poly Aluminium Silicate Sulfate). PACS was found to be superior to PASS in its coagulating ability almost two times as much. The variation of ζ-potential of suspended particles in the sign and magnitude was closely related to the turbidity removal behavior. For the application of two coagulant mixtures, the overall coagulating power was a function of the mixing ratio and, in case of sequential dosage of two coagulants, the entire coagulation feature was governed by the firstly dosed coagulant. When a same amount of coagulant was dosed in partition to the supernatant water of one time treated wastewater, the final turbidity of two time treated supernatant water showed a lower value compared with the case that all amount of coagulant was dosed at one time. The size of coagulum formed using PACS was larger than that using PASS and it was thought that the coagulum size was determined by the coagulating power of coagulant. Slow mixing time and rate were considered to be influential on the degree of turbidity removal, but not on the ζ-potential of particles. An appropriate temperature range was established for a better turbidity removal and beyond this range the turbidity increased as the temperature rised.
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