Applied Chemistry, Vol.1, No.2, 441-444, October, 1997
정수처리시 알루미늄계 응집제 사용에 따른 탁도와 잔류알루미늄 농도의 변화
The Variation of turbidity and residual aluminum concentration on using coagulants based on aluminum for water treatment system
초록
거의 모든 정수장에서 탁도를 제거하기 위해 응집,침전공정을 행한다. 정수처리과정에서 황산알루미늄(Alum)과 폴리염화알루미늄(PAC)과 같은 응집제를 사용하여 잔류알루미늄농도가 증가하는 것으로 알려졌다. 따라서 Jar-test를 사용하여 응집에 영향을 미치는 여러요인들중 잔류탁도와 잔류알루미늄농도를 최소화 할 수 있는 최적조건을 찾고자 하였다. 그 결과는 다음과 같다. Alum과 PAC 20∼30mg/l 범위에서 잔류알루미늄농도는 0.128∼0.178mg/l 검출되어, 처리수의 잔류알루미늄농도 감소를 위해서는 응집제의 최적 주입률 결정이 중요한 것으로 나타났다.
Almost the purification plants are accomplished coagulation sedimentation for removing the turbidity. It has been known that the concentration of residual aluminum increases during the purification treatment due to aluminum sulfate and poly aluminum chloride, which are being used as a coagulant. We intended to find the optimal condition to minimize the concentration of residual turbidity and aluminum using jar-test with the various condition affecting the coagulation. The results were as follows. The residual aluminum concentration is detected 0.128mg/l∼0.178mg/l at the range of 20∼30mg/l for Alum and PAC. Thus, it is important that the optimal dosage of coagulant can be decided to decrease the concetration of residual aluminum in purified water.