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Water, Air, & Soil Pollution

, Volume 223, Issue 4, pp 1639–1647 | Cite as

Enhanced Removal of Micropollutants from Groundwater, Using pH Modification Coupled with Photolysis

  • Yaal Lester
  • Hadas Mamane
  • Dror AvisarEmail author
Article

Abstract

Direct ultraviolet (UV) photolysis coupled with modification of solution pH was explored as a method for the removal of organic micropollutants from groundwater. Photodegradation rates of most of the investigated compounds were pH dependent, however, its correlation with photodegradation rate varied among compounds. The potential of the pH modification during photolysis was determined for removal of a mixture of two pharmaceuticals sulfamethoxazole (SMX) and triclosan (TCS) in groundwater. The treatment included initial photolysis of the mixture at the optimal pH for TCS (i.e., 7.5–7.9), followed by pH modification to the optimal pH for SMX (i.e., 5), prior to a second irradiation period. The described procedure dramatically increased the removal efficiency (up to threefold) of the treated mixture compared to UV treatment at constant pH.

Keywords

Micropollutant pH modification Photodegradation Polychromatic UV Water treatment 

Notes

Acknowledgments

The authors would like to thank Mr. Yair Lakretz for his essential comments. This study was funded by the Israeli Water Authority.

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Copyright information

© Springer Science+Business Media B.V. 2011

Authors and Affiliations

  1. 1.The Hydrochemistry Laboratory, Geography and the EnvironmentTel Aviv UniversityTel AvivIsrael
  2. 2.School of Mechanical Engineering, Faculty of EngineeringTel Aviv UniversityTel AvivIsrael
  3. 3.Hydrochemisry, Geography and the EnvironmentTel Aviv UniversityTel AvivIsrael

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