Removal Effect of Organics in Reverse Osmosis Concentrate of Municipal Wastewater by Ozone Catalytic Oxidation

To effectively remove the organics in municipal wastewater reverse osmosis concentrate （ROC） and understand their removal characteristics，the performance of ozone catalytic oxidation in the treatment of municipal wastewater ROC was studied based on measurements of conventional wastewater quality indices，analyses of relative molecular mass classification and hydrophobic/hydrophilic properties of organic matters， and methods of chromatography‑mass spectrometry and electron paramagnetic resonance spectroscopy. The results indicate that the optimal treatment conditions are a reaction time of 80 min，an ozone mass concentration of 17 mg/L，and a raw wastewater pH of 7. 3. The removal efficiencies of chemical oxygen demand（COD），UV absorbance at 254 nm wavelength（UV254），large‑molecule organics （ >30 ku） and hydrophilic acid component （HOA） are 55. 75%，85. 05%，95. 46%，and 72. 06%，respectively. Refractory organics such as aromatic hydrocarbons and humic acids，as well as pharmaceutical and personal care products（PPCPs）can be efficiently removed. Active substance·OH is generated. The data of COD degradation can be well described by a second‑order reaction kinetics model. © 2024 Northeast University. All rights reserved.