389778 Photocatalytic Degradation of Methamphetamine Using UV/TiO2

Wednesday, November 19, 2014: 10:10 AM
M303 (Marriott Marquis Atlanta)
Chin-Sheng Kuo1, Cheng-Fang Lin1 and Pui-Kwan Andy Hong2, (1)Graduate Institute of Environmental Engineering, National Taiwan University, Taipei, Taiwan, (2)Department of Civil and Environmental Engineering, University of Utah, Salt Lake City, UT

Methamphetamine (MAT) is a prescription drug and a substance of abuse; it cannot be effectively removed in wastewater treatment plants (WWTPs). As a result, MAT has been found at 61-405 ng/L in hospital effluents, WWTP influents and effluents, as well as surface waters in Taiwan. Even at trace level, MAT can pose risks of long-term exposure, bioaccumulation, and biomagnification on aquatic organisms. This project evaluates the effectiveness of eliminating MAT from waters using existent UV disinfection process in WWTPs in the presence of TiO2 photocatalyst. We tested the use of TiO2 (Degussa P25) under UV illumination (9 W at 365 nm) for the photocatalytic degradation of MAT to define the removal kinetics. Removal was investigated under varied experimental parameters including TiO2 loading, MAT concentration, and pH; MAT and its intermediates throughout treatment were monitored by HPLC-MS/MS, along with TOC and IC analyses to determine the extent of mineralization. The results showed elimination of 100 ppb of MAT within 30 min of irradiation of TiO2 at 0.03 g/L at pH 7. The degradation of MAT followed pseudo-first order kinetics conforming to the Langmuir-Hinshelwood model. Complete mineralization of 10 ppm of MAT was achieved in 180 min with 0.1 g/L of TiO2 at pH 5, whereas the organic nitrogen was converted predominantly to NH4+. Photocatalytic process with UV/TiO2 shows promise in arresting the release of MAT and its intermediates into the water environment.

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See more of this Session: Advanced Oxidation Processes I
See more of this Group/Topical: Environmental Division