Oxidation of Aqueous Dexamethasone Solution by Gas-Phase Pulsed Corona Discharge

Water

卷:14

Marina Trapido¹  Sergei Preis¹  Eneliis Kattel-Salusoo¹  Liina Onga¹ 

[1] Department of Materials and Environmental Technology, Tallinn University of Technology, Ehitajate tee 5, 19086 Tallinn, Estonia;

关键词: dexamethasone;    ozone;    plasma;    wastewater treatment;    hydroxyl radicals;   

DOI  :  10.3390/w14030467

来源: DOAJ

【 摘 要 】

The most widely used anti-inflammatory corticosteroid dexamethasone (DXM), frequently detected in waterbodies due to its massive consumption and incomplete removal in wastewater treatment processes, was experimentally studied for oxidation with gas-phase pulsed corona discharge (PCD) varied in pulse repetition frequency, pH, DXM initial concentration and additions of surfactant sodium dodecyl sulphate (SDS) and tert-butyl alcohol (TBA). The experimental study also included ozonation as compared to PCD in energy efficiency. The advantageous energy efficiency of PCD was observed in wide spans of pH and DXM initial concentrations surpassing ozonation by about 2.4 times. Identified transformation by- and end-products (fluoride and acetate), as well as the impact of radical scavengers, point to the prevalent radical oxidation of DXM. Somewhat increased toxicity observed on the course of PCD-treatment of high DXM concentrations presents a subject for further studies.

【 授权许可】

Unknown