The Efficiency of Peroxone Process in Packed Reactor for Removal of Anionic Surfactants and COD from Carwash Wastewater

Background: Carwash is an industry that consumes large amounts of water and its wastewater contains a variety of pollutants.  The aim of this study was to investigate the efficiency of the Peroxone process as a method for wastewater treatment of carwashes.   Methods: This study was conducted at laboratory scale. A total of ۵۴ samples were collected from a carwash in Yazd city and COD and anionic surfactants removal percentages were respectively determined by using the standard vial and anionic surfactants method and Methylene Blue Active Substances (MBAS). The process was conducted with an ozone dose of ۰.۷ mg per min, H۲O۲ concentrations of ۱۰, ۲۰ and ۴۰ mmol per liter, reaction times of ۳۰, ۶۰ and ۹۰ min and pH of ۷, ۹ and ۱۱ in a cylindrical reactor respectively. Data were analyzed using ANOVA and through SPSS ۱۸.   Results: The removal efficiencies of COD and anionic surfactants increased with increasing pH and reaction time; so that, at  pH =۱۱ and after a reaction time of ۹۰ minutes for an ozone dose of ۰.۷ mg/min and H۲O۲ concentration of ۴۰ mmol/l, removal efficiency of COD and anionic surfactants  were respectively ۷۴.۷۷% and ۷۴.۲۷%.   Conclusion: The peroxone process has a good ability for removal of COD and anionic surfactants. Similar studies confirm the findings of this study. Meanwhile, pretreatment methods are recommended for further evaluation of this process.

کلیدواژه ها:

Carwash ، Peroxone ، Anionic surfactants ، COD ، Packed Reactor