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In this study, the effects of mixing intensity and coagulant dosages on the characteristics of floc growth for phosphorus removal were investigated. The experiments were conducted under Al/P molar ratio of 1.0, 1.5 and 2.0; rapid mixing intensity with G value of 100, 300, and 500 s -1 . The characteristics of floc growth were measured by flocculation index (FSI) and the removal efficiencies of phosphorus by using different size filters. The removal efficiencies of soluble phosphorus increased as Al/P molar ratio and rapid mixing intensity increased. However, the highest removal efficiencies of T-P were observed at G value of 300 s -1 . When Al/P molar ratio was lower than 1.0, the value of FSI at G value of 500 s -1 was the largest. However, when Al/P ratio was larger than 1.0, the value of FSI at G value 300 s -1 was the largest. Effects of mixing intensity and Al/P molar ratio on coagulation for phosphorus removal of synthetic and real wastewater effluent were observed to be similar.

Effect of Rapid Mixing Intensity and Coagulant Dosages on Phosphorus Removal by Coagulation