Abstract

본 연구는 급격한 수질변화에 따른 현장 적용에 적합한 응집제를 선정하고, 응집제 별 최적 주입량을 찾기 위해 aluminium sulfate, poly aluminum chloride, poly aluminum silicate chloride를 이용하여 Jar-Test와 Pilot-Test의 검증으로 실험 하였다. 분석 항목은 탁도, TOC, pH로 제거율을 측정하였다. 실험 결과를 바탕으로 PASC의 경우 기존 응집제 인 Alum이나 PAC 보다 최적 주입량 (15 mg/L)이 상대적으로 적었으며, 제거율도 높게 나타남을 확인할 수 있었다. Jar-Test에서는 원수 탁도 3-20 NTU 범위에서 응집제(PASC)의 최적 주입량을 주입하였을 때, 탁도 제거율(80%)과 TOC 제거율(89%)이 가장 높았으며, Pilot-Test에서는 원수 탁도 3.6-27 NTU 범위에서 응집제 최적 주입량을 주입하였을 때 탁도 제거율(82%)과 TOC 제거율(88%)을 확인할 수 있었다. 따라서 본 연구 결과를 바탕으로 응집제의 제거 효과는 원수 탁도와 TOC가 높아질수록 상승하는 경향을 확인할 수 있었다. 【Three coagulants, alum sulfate(alum), poly aluminum chloride(PAC) and poly aluminum silicate chloride (PASC), were used to remove low to high turbidity and TOC in surface and ground blended water. Laboratory experiments and pilot plant experiments were carried out to evaluate the optimal coagulant and its dosage. To determine the optimized coagulant and its dosage, the turbidity, TOC and pH were measured. The experimental results showed the best removal performance using PASC. The optimal dosage of PASC between 3-20 NTU was found to be 15 mg/L in the jar test. In the pilot test, a 15 mg/L PASC dosage was applied and resulted in the efficient removal of turbidity and TOC between 3.6-27 NTU. The removal efficiency of PASC increased with increasing turbidity and TOC.】

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