Enhanced Removal of Micropollutants from Groundwater,Using pH Modification Coupled with Photolysis |
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Authors: | Yaal Lester Hadas Mamane Dror Avisar |
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Institution: | (1) The Hydrochemistry Laboratory, Geography and the Environment, Tel Aviv University, Tel Aviv, 69978, Israel;(2) School of Mechanical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv, 69978, Israel;(3) Hydrochemisry, Geography and the Environment, Tel Aviv University, Tel Aviv, 69978, Israel; |
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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. |
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