Treatment of Leachate by Electrocoagulation Technique Using Iron And Hybrid Electrodes

Abstract

The most techniques for treating leachate and wastewater are physical, chemical, biological, advanced oxidation and electrochemical techniques. Developed oxidation techniques lead to high treatment cost and mostly are used in purifying grade waters. Among these techniques, the chemical coagulation technique not only is a slow process, but also produces a large amount of sludge. Electrocoagulation has been used for treating industrial effluent and leachate as a potential technique because of its compatibility and adaptability with environment. In this technique, a direct current source between metal electrodes plunged in the effluent is used to dissolve the electrode plates into the effluent. The metal ions with appropriate pH can create various types of coagulated species and metal hydroxides that in turn cause to rolling up and destabilizing the elements, or catalyzing and absorbing the dissolved pollutants. Therefore, the purpose of the current study is to examine the potentials of electrocoagulation in treating the leachate and wastewater by treating the heavy metals and their colour and salinity. Furthermore, the present study aims to investigate the electrocoagulation, electrochemical technologies and their design and application in treating the leachate, water, and wastewater. This work mostly dealt with the electrocoagulation (EC), electrodeposition, electroflotation (EF), and electrooxidation. It was shown that Electrodeposition is efficient in treating the wastewater stream and removing heavy metals. In addition, electrocoagulation was used for treating wastewater and producing clean water as well. It was also found that using aluminum, iron or the hybrid Al/Fe electrodes are more applicable. Keyword: Electrocoagulation, Treatment, Leachate, Wastewater, Iron and Aluminum Electrode, Hydride electrode