مشخصات پژوهش

صفحه نخست /Monopolar Electro-coagulation ...
عنوان
Monopolar Electro-coagulation Process for Azo Dye C.I. Acid Red 18 Removal from Aqueous Solution
نوع پژوهش مقاله چاپ شده
کلیدواژه‌ها
Acid Red 18; Solutions; Wastewater; Electro-Coagulation
چکیده
The discharge of wastewaters containing well-untreated dye results in aesthetic problems and an increase in gases solubility which causes light transmission inhibition into water bodies. In spite of advantages of physicochemical and biological methods, these processes produce huge amounts of sludge, toxic by-products and require several oxidant chemicals. By contrast, the electrochemical processes because of high versatility, high efficiency and eco-friendly properties are more acceptable. In the present study, the removal of azo dye Acid Red 18 and chemical oxygen demand (COD) from synthetic wastewater by monopolar electro-coagulation (EC) process was investigated and key parameters such as operating time, current density (CD), initial pH and energy and electrode consumptions were optimized. It was found that the process had a very good efficiency in the removal of both COD and color; in the case of iron electrode, the maximum amounts of color and COD removal were 99.5% and 59.0%, respectively. The operating time of 45 min, pH = 7 and CD =1.2 mA/cm2 were selected as the optimized points. The optimization of variables is extremely crucial as it results in a decrease in costs, energy and electrode consumption. As a whole, the iron electrode used lower energy than the aluminum electrode and is more acceptable owing to economical reasons. The findings of UV/vis spectra illustrated the structures of this dye was removed by the process. In comparison with traditional methods like aerobic and anaerobic systems, the EC process is a suitable alternative for the treatment of wastewaters containing dye pollutants.
پژوهشگران قاسم آذریان (نفر اول)، علیرضا رحمانی (نفر سوم)، کاظم گودینی (نفر چهارم)، محمد بازدار (نفر پنجم)، حسن ذوالقدرنسب (نفر ششم به بعد)