Abstract
Electrocoagulation (EC) has been known for over a century. Applications in industry as water and wastewater treatment processes were adapted for the removal of suspended solids, organic compounds, COD (Chemical oxygen demand), BOD (biochemical oxygen demand), metallic and non-metallic pollution. The main advantage in EC technology is the fact that it works without the addition of chemical products. The DC current between metallic electrodes immersed in the effluent is used as an energy source for this technique, which causes their dissolution. The effect of the main parameters, current density, treatment time, initial pH, temperature, electrode materials, conductivity and distance between the electrodes were investigated. According to the conclusion of the works published in recent years, the removal efficiencies of pollutants materials by EC process are very important.
Highlights
In many applications for water, wastewater and sludge treatment are used, with high performance, the coagulation, flocculation and electrocoagulation processes [1,2,3,4,5,6].The electrochemical technique contributes in many ways to a cleaner environment and covers a very wide range of technologies
Electrocoagulation in recent years has become a very important electrochemical method through several successes that have been acquired in water and wastewater treatment such as used water containing heavy metals, emulsions, suspensions and in potable water treatment
A presence of Cl- at a level of 20% of the total anions concentration is recommended to ensure a normal operation of electro-coagulation in water treatment [9]
Summary
In many applications for water, wastewater and sludge treatment are used, with high performance, the coagulation, flocculation and electrocoagulation processes [1,2,3,4,5,6]. Electrocoagulation in recent years has become a very important electrochemical method through several successes that have been acquired in water and wastewater treatment such as used water containing heavy metals, emulsions, suspensions and in potable water treatment. This process presents an alternative to conventional coagulation with several advantages such as ease of use, low quantities of produced sludge, avoidance in chemical usage, there is no need to neutralize excess chemicals and no secondary pollution problems [5]. Another variant of this system oxidizes an iron or aluminum anode to form an iron or aluminum hydroxide flocculent that can co-adsorb/co-precipitate some ions
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