Keen, O.S., Love, N.G., Aga, D.S. and Linden, K.G. (2015)
Keen, O.S., Love, N.G., Aga, D.S. and Linden, K.G. (2015) Biodegradability of iopromide products after UV/H2O2 advanced oxidation. Chemosphere 144, 989-994
Keen, O.S., Love, N.G., Aga, D.S. and Linden, K.G. (2015) Biodegradability of iopromide products after UV/H2O2 advanced oxidation. Chemosphere 144, 989-994
Keen, O.S., Bell, K.Y., Cherchi, C., Finnegan, B.J., Mauter, M.S., Parker, A.M., Rosenblum, J.S., Stretz, H.A. (2014) Emerging pollutants – Part II: Treatment. Water Environment Research 86(10), 2036-2096
Keen, O.S., Thurman, E.M., Ferrer, I. and Linden, K.G. (2014) Susceptibility of lamotrigine to degradation by hydroxyl radicals, ozone and direct photolysis in UVC range. Chemosphere 117, 316-323
Keen, O.S., McKay, G., Mezyk, S.P., Linden, K.G. and Rosario-Ortiz, F. (2014) Identifying the factors that influence the reactivity of effluent organic matter with hydroxyl radicals. Water Research 50(1), 408-419
This project involves novel biological treatment of landfill leachate.
Advanced oxidation is a highly effective process for treatment of organic contaminants and is frequently used for taste and odor mitigation and for treatment of water from sources impacted by human activity (indirect potable water reuse). However, it has some operational challenges on full-scale. One of the major challenges is dealing with residual hydrogen peroxide which interferes with subsequent chlorine disinfection by reacting with chlorine. Current methods of dealing with residual H2O2 involve adding more chlorine or using activated carbon to destroy H2O2. Both processes are expensive for a full scale water treatment plant, and our lab is evaluating alternatives to the currently established processes.
Wastewater contains trace amounts of antibiotics as well as other pharmaceuticals. During chlorine disinfection, pharmaceuticals react with chlorine and form transformation products, some of which may retain the properties of the parent molecule. We are testing the properties of the products that form with antibacterial activity assays and identify the product with high performance liquid chromatography coupled with mass spectrometry (HPLC/MS). Doxycycline forms products with antibacterial activity. The formation of the products is more prominent in clean water than in wastewater effluent matrix due to selective competitive reactions between chlorine and either organic matter or doxycycline. Testing of other antibiotics is planned in the near future.