Abstract
Abstract : Low pressure air flotation (LAF) pilot plant for sludge thickening was installed in Chung Nam N.S. municipal waste water treatment plant to verify its application possibility. Effects of operating conditions such as coagulant dosages and microbubble water ratio on thickening of the mixed sludge were examined. Microbubbles which were generated in the chamber of 1.5 kg f /cm 2 by high speed collision method with foaming agent were used to float sludge. Solid loading of 30 kg/m 2 /hr, solid contents in thickened sludge of 60,300 mg/L and SS removal efficiency of 99% were obtained through long period operating LAF in condi-tions of mixed sludge concentration of 14,400 mg/L, coagulant dosage of 27.6 mg/L, foaming agent addition of 4.0 mg/L and mi-crobubble water injection ratio of 9.7%. Key Words : Low Pressure Air Flotation, Microbubble, Sludge Thickening, DAF 요약: 가압형 부상법에 비해 낮은 압력에서 미세기포를 발생시키는 저압형 부상법을 슬러지 부상 농축에 적용하여 그 성능을 검증하고 실제 적용가능성을 확인하였다. 파일롯 규모의 저압형 부상조를 충남 N.S. 하수처리장에 설치하여 혼합슬러지의 농도, 응집제 주입량 및 혼합슬러지 대비 미세기포수의 비율과 같은 운전 변수가 혼합슬러지 농축에 미치는 영향을 확인하였다. 미세기포는 내부 압력이 1.5 kg
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