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부상여재를 이용한 2단 직접여과 시스템의 총인제거에 관한 연구
우달식 ( Dal Sik Woo ),신성훈 ( Sung Hoon Sin ),채수권 ( Su Kwen Chae ),정종태 ( Jong Tae Jung ),조용현 ( Young Hyun Cho ),한상윤 ( Sang Yun Han ),김희영 ( Hee Young Kim ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.1
Wastewater treatment plants are required to meet the enhanced discharge standards which are differentiated by 0.2, 0.3 and O.5mgT-P/L for the district I, II and III, respectively. Thus, this study was performed whether the two stage direct filtration system combined process of inline mixer process and upflow two stage filter process with floating filter medium was an efficient treatment method for total phosphorus removal from secondary sewage effluent. In the two stage direct filtration experiments, coagulants including aluminum sulphate (alum), polyaluminium chloride (PACI), polyaluminum silicate chloride-2 (PACS-2) ferric chloride (FeCl3) were injected to study the optimum condition for the P04-P removal by jar test. The maximal T-P removal efficiency was achieved for 2.5~3.0 AI (Fe)/P mole ratio and pH 6.0-6.5. Based on the two stage direct filtration experiments, it can be concluded that PACI and FeCl3 were found as an efficient coagulant for the total phosphorus removal and better flocculation. The operation of the two stage direct filtration system at filtration rate of 600m/day could achieve satisfied T-P removal.