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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.
정종태 ( Jong Tai Jung ),우달식 ( Dal Sik Woo ),조용현 ( Yong Hyun Cho ),한상윤 ( Sang Yun Han ),김희영 ( Hee Young Kim ),신성훈 ( Sung Hoon Sin ) 한국수처리학회 2013 한국수처리학회지 Vol.21 No.2
This work was aimed to study the chemical coagulation of phosphate from secondary effluent. Base on jar test experiments, also, the growth, breakage and regrowth of flocs formed by different coagulants, poly aluminium chloride(PACl), poly aluminum calcium chloride(PolyCa) and ferric chloride(FeCl3). The results showed the flocs generated in Mode 2(5.25~5.28NTU) were more resistant to shear and more recoverable than those did in Mode 1(0.24~0.27NTU). The floc size by coagulation depended on the particle size of the raw water. Although the floc strength factor was similar to each coagulants, floc formed in high turbidity condition were stronger. Specifically, PolyCa could get higher removal efficiency of phosphate than PACl and FeCl3. Moreover, the T-P removal efficiency was poor in low turbidity.