Degradation of Dimethyl Phthalate Using Persulfate Activated by Uv and Ferrous Ions: Optimizing Operational Parameters Mechanism and Pathway Publisher



Badi MY^{1, 2} ; Esrafili A^{1, 2} ; Pasalari H^{1, 2} ; Kalantary RR^{1, 2} ; Ahmadi E^{3, 5} ; Gholami M^{1, 2} ; Azari A^{3, 4, 5}
Source: Journal of Environmental Health Science and Engineering Published:2019

Abstract

The present study aimed to model and optimize the dimethyl phthalate (DMP) degradation from aqueous solution using UVC/ Na2S2O8/Fe2+ system based on the response surface methodology (RSM). A high removal efficiency (97%) and TOC reduction (64.2%) were obtained under optimum conditions i.e. contact time = 90 min, SPS concentration = 0.601 mM/L, Fe2+ = 0.075 mM/L, pH = 11 and DMP concentration = 5 mg/L. Quenching experiments confirmed that sulfate radicals were predominant radical species for DMP degradation. The effect of CO3- on DMP degradation was more complicated than other aquatic background anions. The possible pathway for DMP decomposition was proposed according to HPLC and GC-MS analysis. The average oxidation state (AOS) and carbon oxidation state (COS) values as biodegradability indicators demonstrated that the UVC/SPS/Fe2+ system can improve the bioavailability of DMP over the time. Finally, the performance of UVC/SPS/Fe2+ system for DMP treatment in different aquatic solutions: tap water, surface runoff, treated and raw wastewater were found to be 95.7, 88.5, 80.5, and 56.4%, respectively. [Figure not available: see fulltext]. © 2019 Springer Nature Switzerland AG.