This study evaluates the UV/H2O2 and UV/S2O82- (UV/PS) processes as alternative methods for the removal of ibuprofen (IBF) from wastewater destined for treatment and reuse. The second-order rate constants of IBF with HO and SO4- were determined as kHO/IBF=5.57×109M-1s-1 and kSO4-/IBF=1.32×109M-1s-1. The IBF removal rate was higher in the UV/PS process than in the UV/H2O2 process for deionized water, while a higher IBF removal rate was seen with the UV/H2O2 process than with the UV/PS process for wastewater effluent. The suppression of IBF removal in wastewater effluent was verified by investigating the effects of background water quality using synthetic solutions (HCO3-, Cl-, NO3-, SO42-, humic acid, and fulvic acid); HCO3- and organic compounds showed stronger inhibitory effects on the UV/PS process than on the UV/H2O2 process. A mineralization test on the effluent organic matter (EfOM) revealed a higher efficiency for the UV/PS process than the UV/H2O2 process. A toxic by-product test showed a notably higher production yield of 4-isobutylacetophenone (4-IBAP) with the UV/PS process ηUV/PSIBF→IBAP=0.23 than with the UV/H2O2 process ηUV/H2O2IBF→IBAP=0.019, even though 4-IBAP was removed by both processes.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIP) (2013R1A2A2A05006466), Ministry of Land, Infrastructure and Transport (MOLIT) as “Development of Pressure Retarded Osmosis Pretreatment” (code 13IFIP-B065893-01), and Korea Ministry of Environment (MOE) as “A real scale project on algae monitoring and removal-utilization technology” (2014001800001).
© 2015 Elsevier B.V.
All Science Journal Classification (ASJC) codes
- Environmental Chemistry
- Chemical Engineering(all)
- Industrial and Manufacturing Engineering