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DOI : ,    Vol.21, No.2, 39 ~ 47, 2013
Title
Effect of Turbidity on Flocs Formation on Secondary Sewage Effluent
정종태 Jong Tai Jung , 우달식 Dal Sik Woo , 조용현 Yong Hyun Cho , 한상윤 Sang Yun Han , 김희영 Hee Young Kim , 신성훈 Sung Hoon Sin
Abstract
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.
Key Words
floc growth, floc size distribution, strength factor, recovery factor, coagulants, phosphorus removal
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