Journal of Korean Society of Water and Wastewater (상하수도학회지)

The Korean Society of Water and Wastewater (대한상하수도학회)
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Effects of polymeric Al and hydrolysis products of PAC at different pH on performance of nanofiltration with PAC coagulation pretreatment

PAC 전처리 시 수소이온 농도에 따라 발생 가능한 알루미늄 종에 의한 나노여과막 성능 연구

  • 최양훈 (건국대학교 공과대학 환경공학과) ;
  • 권지향 (건국대학교 공과대학 환경공학과)
  • Received : 2009.07.29
  • Accepted : 2010.01.27
  • Published : 2010.02.15
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Abstract

Coagulation can be used for pretreatment of NF membrane filtration. Foulants such as organic matter and particulate can be removed effectively with the process while high flux recovery is maintained. Recently various types of polyaluminium coagulants including polyaluminium chloride(PAC) are commercially available for water treatment. This study examines effects of polymeric Al and hydrolysis products of PAC on nanofiltration membrane performance. Dominant hydrolysis products were polymeric Al, $Al(OH)_3$, and ${Al(OH)_4}^{-1}$ at acidic, neutral, and alkaline pH conditions, respectively. Under acidic pH condition, flux decline was increased with increasing PAC concentrations, possibly due to polymeric Al adsorption on membrane pore and/or surfaces. For neutral and alkaline pH conditions, little flux decline was observed with increasing PAC concentrations except the highest ${Al(OH)_4}^{-1}$ concentration, with which rapid flux decline was shown. Removal of ionic matters was also varied with pH conditions in this study. Especially, conductivity removal was substantially low and $Ca^{2+}$ concentration in the permeate was quite high at neutral pH condition.

Keywords

References

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