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Simultaneous Thermal Activation of Persulfate/Fenton System for High-Concentration N,N-Dimethylacetamide Degradation: Parameter Optimization and Degradation Mechanism

Simultaneous Thermal Activation of Persulfate/Fenton System for High-Concentration N,N-Dimethylacetamide Degradation: Parameter Optimization and Degradation Mechanism

Environmental Engineering Science 36(1): 12-22

ISSN/ISBN: 1092-8758

DOI: 10.1089/ees.2018.0197

This article is aimed to find an effective method to decompose high-concentration N,N-dimethylacetamide (DMAC) in aqueous solution, which is widely used in chemical industry. Thermal activation persulfate/Fenton/thermal system (PS/Fenton/thermal system) was studied for this purpose. Effects of persulfate (PS) dosage, H2O2 dosage, [H2O2]/[Fe2+] molar ratio, and reaction temperature on degradation of DMAC in aqueous solution by PS/Fenton/thermal system were studied through single-factor experiment and response surface methodology. Results revealed that the DMAC and Chemical Oxygen Demand (COD) removal efficiencies by PS/Fenton/thermal system (96.5%/35.7%) were much higher than PS/Fenton, Fenton/thermal, PS/thermal, PS, Fenton, and heating systems (i.e., 59.6%/24.8%, 55.3%/20.14%, 9.9%/5.2%, 0.6%/0.3%, 0.2/0, and 0/0). High removal efficiency of the high-concentration DMAC mainly resulted from the synergistic effect of the PS/Fenton/thermal system, and the degradation mechanism was illustrated. In addition, according to the concentration of intermediates detected by high performance liquid chromatography, it can be seen that demethylation of DMAC in PS/Fenton/thermal system was facilitated by SO4- and HO, and decomposition pathway of DMAC was proposed. As a result, this work shows that the PS/Fenton/thermal system can be suggested as a high-efficiency process for treating high concentration DMAC-contained wastewater.

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