Treatment of Leachate by Electrocoagulation Technique Using Iron And Hybrid Electrodes

Abstract

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.

Remediation of refinery wastewater using lectrocoagulation process

“…EC has been applied successfully to tannery wastewater (Feng, 2007), petroleum refinery wastewater (El-Naas et al, 2009), the removal of lignin and phenol from paper mill effluents (Ugurlu et al, 2008), olive mill wastewater (khoufi et al, 2007), the removal of heavy metals (Shafaei et al, 2011), the removal of dairy effluents (Tchamango et al, 2010), textile wastewater (Khandegar and Saroha, 2013). Electrocoagulation has been investigated and applied for purifying the wastewater by many researchers previously and the results show demonstrates that electrocoagulation is a useful process in treating different wastes such as soluble oils, liquid generated by food, industrial materials, and fibers and effluents come from the paper industry (Fadali et al, 2016;Mohammadizaroun and Yusoff, 2014;Martínez-Delgadillo, 2010;Ni'am et al, 2007).It removes metals, colloidal solids and particles, petrochemical hydrocarbonsand soluble inorganic pollutants from aqueous media (Yilmaz et al, 2007;Moussavi et al, 2011). Mohammadizaroun and Yusoff, (2014) classified the factors that may affect the efficiency of electrocoagulation into: (i) factors related to the properties of the treated wastewater like nature of pollutants, pH of wastewater,temperature and amount of wastewater and (ii) Design of the treatment apparatus and treatmentparameters like voltage, current, type of sacrificial anode and alignment of electrodes.…”

“…Electrocoagulation has been investigated and applied for purifying the wastewater by many researchers previously and the results show demonstrates that electrocoagulation is a useful process in treating different wastes such as soluble oils, liquid generated by food, industrial materials, and fibers and effluents come from the paper industry (Fadali et al, 2016;Mohammadizaroun and Yusoff, 2014;Martínez-Delgadillo, 2010;Ni'am et al, 2007).It removes metals, colloidal solids and particles, petrochemical hydrocarbonsand soluble inorganic pollutants from aqueous media (Yilmaz et al, 2007;Moussavi et al, 2011). Mohammadizaroun and Yusoff, (2014) classified the factors that may affect the efficiency of electrocoagulation into: (i) factors related to the properties of the treated wastewater like nature of pollutants, pH of wastewater,temperature and amount of wastewater and (ii) Design of the treatment apparatus and treatmentparameters like voltage, current, type of sacrificial anode and alignment of electrodes. This study was designed to assess the efficiency of the process of electrocoagulationin the remediation of wastewater from Kaduna Refinery and Petrochemical Companysince the wastewater have become a menace to the inhabitants of Rido and Romi.…”