Determination of Optimum Coagulant Dosage for Effective Water Treatement of Chyinyang Lake - The Effect of Coagulant Dosing on Removal of Algae-

진양호소수의 효과적인 정수처리를 위한 최적응집제 주입량 결정 -조류제거를 위한 응집제 주입효과-

  • 이원규 (경남도청 환경정책과) ;
  • 조주식 (순천대학교 농화학과) ;
  • 이홍재 (경상대학교 농화학과) ;
  • 임영성 (경상대학교 농화학과) ;
  • 허종수 (경상대학교 농화학과)
  • Published : 1999.10.01

Abstract

This study was performed to determine the optimum coagulant dosing for effective treatment of raw water in Chinyang lake. Removal rates of algae and characteristics of the water according to coagulants dosage were investigated by treatment with Microcystis aeruginosa, which is a kind of blue-green algae, to the raw water below 5NTU. The coagulants dosage for maximum removal rate of algae were 30 mg/$\ell$ of Alum, 30 mg/$\ell$ of PAC and 10 mg/$\ell$ of PACS, respectively. The removal rate of algae in 30 mg/$\ell$ of PAC was highest as 85% compared with the other treatments. At the point of maximum removal rate of algae, the removal rates of turbidity were 34%, 66% and 22% in Alum, PAC and PACS, respectively. Residual Al was decreased depend upon decreasing turtidity in water by treatment of Alum or PAC, but decreased depend upon increasing turbidity in water by treatment of PACS. The removal rate of ${Mn}_{2+}$ in water was high in the order of Alum, PAC and PACS treatment. And ${Fe}_{2+}$ in water was not changed by treatemnt of these coagulants. Particle numbers distributions according to the particle size of suspended solids that were not precipitated at 8 min. of settling time after treatment of coagulants dosage for the maximum removal rate of algae were investigated. Most of the particle sizes were below 30 $\mu$m and particle numbers distributions below 10 $\mu$m were 64%, 56% and 66% by treatment of Alum, PAC and PACS, respectively. Zeta potential was in the range of -6.1~-9.7 mV at optimum coagulants dosage for algae removal.

Keywords

algae;coagulant dosage;particle number;zeta potential

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