Advanced Oxidation Processes (AOPs) in Wastewater Treatment

• Published in: Current pollution reports Vol. 1; no. 3; pp. 167 - 176
• Main Authors: Deng, Yang, Zhao, Renzun
• Format: Journal Article
• Language: English
• Published: Cham Springer International Publishing 01.09.2015; Springer Nature B.V
• Subjects: Aquatic Pollution; Atmospheric Protection/Air Quality Control/Air Pollution; Biodegradability; Biodegradation; Biological treatment; Chemical properties; Contaminants; Drinking water; Earth and Environmental Science; Effluents; Environment; Environmental Law/Policy/Ecojustice; Free radicals; Hydroxyl radicals; Industrial Pollution Prevention; landfill leachates; Landfills; Leachates; Metals; Monitoring/Environmental Analysis; Municipal landfills; Municipal wastewater; Organic contaminants; Oxidation; Pollutants; Pollution; Section Editor; Sulfates; Topical Collection on Water Pollution; Ultrasonic imaging; Waste disposal sites; Waste treatment; Waste Water Technology; Wastewater treatment; Water Management; Water Pollution (S Sengupta; Water Pollution Control; Water pollution treatment; Water reuse; Water treatment; United States > US; Biologically treated secondary effluent (BTSE); Refractory organic pollutants; Landfill leachate; Hydroxyl radicals; Effluent organic matter (EfOM); Chemical oxidation; Sulfate radicals
• ISSN: 2198-6592; 2198-6592
• DOI: 10.1007/s40726-015-0015-z

Advanced oxidation processes (AOPs) were first proposed in the 1980s for drinking water treatment and later were widely studied for treatment of different wastewaters. During the AOP treatment of wastewater, hydroxyl radicals (OH·) or sulfate radicals (SO 4 ·− ) are generated in sufficient quantity to remove refractory organic matters, traceable organic contaminants, or certain inorganic pollutants, or to increase wastewater biodegradability as a pre-treatment prior to an ensuing biological treatment. In this paper, we review the fundamental mechanisms of radical generation in different AOPs and select landfill leachate and biologically treated municipal wastewater as model wastewaters to discuss wastewater treatment with different AOPs. Generally, the treatment efficiencies rely heavily upon the selected AOP type, physical and chemical properties of target pollutants, and operating conditions. It would be noted that other mechanisms, besides hydroxyl radical or sulfate radical-based oxidation, may occur during the AOP treatment and contribute to the reduction of target pollutants. Particularly, we summarize recent advances in the AOP treatment of landfill leachate, as well as advanced oxidation of effluent organic matters (EfOM) in biologically treated secondary effluent (BTSE) for water reuse.