|
Abstract
|
Biological treatment, due to the formation of hazardous chemicals to remove organic
compounds such as dimethyl sulfoxide (DMSO) and N, N-dimethylacetamide (DMAC), has limited
potential. Advanced oxidation processes (AOPs) are regarded as a viable alternative for treating
molecules containing carbon-hydrogen bonds that cannot be broken down by traditional
physico-chemical methods. In this investigation, various AOPs such as Photo-Fenton, Electro-
Fenton, and Photo-Electro-Fenton processes were studied to treat wastewaters containing DMSO
and DMAC. The effects of the operating parameters, including various initial concentrations of
DMSO and DMAC, initial pH, reaction time, different concentrations of Fenton’s reagent, power
of UV lamp, different concentrations of electrolytes, the distance between electrodes and current
intensity, were investigated. The findings of the experiments revealed that a pH of 3 and a reaction
time of 120 min were optimal. At 2000 mg L-1 of DMSO, maximum degradation and the finalconcentration of TOC were 98.64 % and 256.8 mg L-1, respectively, by the Electro-Fenton process
under the optimal conditions. The Electro-Fenton process was successful in determining the maximum
degradation of DMAC (96.31 %) and the final TOC concentration (10.03 mg L
-1) at250 mg L-1 of DMAC under optimal conditions. Finally, it can be concluded that the Electro-
Fenton process was the best process for the efficient removal of DMSO and DMAC. The second
step of the kinetic model follows a pseudo-first-order reaction for 250 and 500 mg L-1 of pollutants
and obeyed a pseudo-second-order kinetic model for concentrations of 1000, 2000 mg L- 1.
|