Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Optimization of chemical precipitation for phosphate removal from domestic wastewater

생활하수내 인 제거를 위한 화학적 침전의 최적화

  • Lee, Sunkyung (Department of Environmental Engineering, Yonsei University) ;
  • Park, Munsik (Department of Environmental Engineering, Yonsei University) ;
  • Yeon, Seungjae (Department of Environmental Engineering, Yonsei University) ;
  • Park, Donghee (Department of Environmental Engineering, Yonsei University)
  • Received : 2016.05.27
  • Accepted : 2016.11.10
  • Published : 2016.12.23
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Abstract

Coagulation/precipitation process has been widely used for the removal of phosphate within domestic wastewater. Although Fe and Al are typical coagulants used for phosphate removal, these have some shortages such as color problem and low sedimentation velocity. In this study, both Fe and Al were used to overcome the shortages caused by using single one, and anionic polymer coagulant was additionally used to enhance sedimentation velocity of the precipitate formed. Batch experiments using a jar test were conducted with real wastewater, which was an effluent of the second sedimentation tank in domestic wastewater treatment plant. Response Surface Methodology was used to examine the responsibility of each parameter on phosphate removal as well as to optimize the dosage of the three coagulants. Economic analysis was also done on the basis of selling prices of the coagulants in the field. Phosphate removal efficiency of Fe(III) was 30% higher than those of Fe(II). Considering chemical price, optimum dosage for achieving residual phosphate concentration below 0.2 mg/L were determined to be 18.14 mg/L of Fe(III), 2.60 mg/L of Al, and 1.64 mg/L of polymer coagulant.

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References

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