سال انتشار: ۱۳۸۶

محل انتشار: پنجمین کنگره بین المللی مهندسی شیمی

تعداد صفحات: ۸

نویسنده(ها):

Ahmadi – Department of Chemical Engineering, School of Engineering, Razi University, Kermanshah, Iran
Mohseni – Department of Chemical & Biological Engineering, University of British Columbia, 2360 East Mall, Vancouver, BC, V6T 1Z3 Canada;
Vahabzadeh – Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran
Bonakdarpour – Department of Chemical Engineering, Amirkabir University of Technology, Tehran, Iran

چکیده:

Phenolic acids constitute a major group of pollutants which are recalcitrant to common biological treatment. In this study synthetic wastewater containing a mixture of p-coumaric and p-hydroxybenzoic acids was evaluated for photo-Fenton pretreatment. The changes in biodegradability (ratio of biochemical oxygen demand to total organic carbon (TOC)) and mineralization (TOC removal) were monitored. While there was a significant biodegradability enhancement during the photo-Fenton process, there was little mineralization (less than 6%) taking place over the course of oxidation. Longer oxidation time did not further improve the pretreatment; rather it decreased the biodegradability of the solution through complete mineralization of the biodegradable intermediates. Resin fractionation of treated solutions indicated an increase in hydrophilic fraction and a decrease in hydrophobic fraction. Indeed, there was a clear and direct correlation between hydrophilic nature of the organics and the biodegradability of the solution, indicating that hydrophilic compounds are more biodegradable. The formation of aldehydes further supported the linkages between biodegradable and hydrophilic compounds.