سال انتشار: ۱۳۸۶

محل انتشار: پنجمین کنگره بین المللی مهندسی شیمی

تعداد صفحات: ۱۰

نویسنده(ها):

Mehrab Mehrvar – Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, Canada M5B 2K3.
Gelareh Bankian Tabrizi – Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, Canada M5B 2K3.
Azadeh Asadi – Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, Canada M5B 2K3.
Thandar Aye – Department of Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario, Canada M5B 2K3.

چکیده:

One of the greatest challenges of water and wastewater treatment technologies is the use of combined processes to achieve the most advantages of each process alone. The choice of the process and/or integration of the processes depend strongly on the wastewater characteristics, concentrations, and the desired efficiencies. It has been observed that the coupling of a biological reactor with advanced oxidation technologies (AOTs) could reduce the final concentrations of the effluent to the desired values. Advanced oxidation technologies are mainly based on the production of highly potent hydroxyl radicals which attack organic compounds and produce carbon dioxide and water. However, optimizing the total cost of the treatment is a challenge, as AOTs are much more expensive than the biological processes alone. Therefore, an appropriate design should not only consider the ability of this coupling to reduce the concentrations of organic pollutants, but also try to obtain the desired results in a cost effective process. To consider the total cost of the treatment, the residence time in biological and photochemical reactors, the kinetic rates, and the capital and operating costs of the reactors play significant roles. In most case studies, it has been shown that the integration processes were more efficient than individual processes. However, slight changes in the configuration of the reactors, temperature, pH, treatment time, concentration of oxidants, and microorganism colonies could lead to a great deviation in results. Hence, in some cases, the coupling of these processes lowered the total efficiency of the system. It is important to consider the possibility of coupling different processes in lowering the total cost of the system while maximizing the rate of total degradation of organic pollutants. In this study, recent developments and trends on the integration of photochemical and biological processes for the degradation of organic pollutants in water and wastewater will be discussed. Case studies for the treatment of selected organic compounds will be addressed.