WATER PURIFYING METHOD COMPRISING EXCESS COAGULATION USING POLY ALUMINIUM HYDROXY CHLORO SULFATE

摘要

A water purifying method comprising an excess coagulation process by means of poly aluminum hydroxy chloro sulfate is provided to increase the removing efficiency of turbidity and to remove effectively the organic turbid materials. An excess of quantity of PAHCS(Poly Aluminium Hydroxy Chloro Sulfate), for example, 30 to 120mg/L is thrown in so that the turbid materials and organic materials are aggregated. The PAHCS of 15 to 30mg/L is thrown in the orignal water with low turbidity below 10 NTU so that the turbid materials are aggregated. After throwing in PAHCS, the polymer aggregate of 0.1 to 0.3mg/L is thrown in. After controlling pH of the original water, PAHCS is thrown in so that pH in the treatment process is controlled by 7.0 to 7.5.