Abstract
The presence of dyes in wastewater has become a major issue all over the world. The discharge of dyes in the environment is concerned for both toxicological and esthetical reasons. In this study, the removal of dyes from aqueous solution by electrocoagulation using aluminum electrodes as cathode and anode were investigated with the electrocoagulation cell of 1litter. The study included: the impact of various operating parameters on the dyes removal efficiency like pH, NaCl concentration, distance between electrodes, voltage, initial dyes concentration and type of electrodes. The dye (congo red) concentrations were (50, 100, 150, and 200 ppm), stirring speed was 120 rpm at room temperature. pH used was maintained constant. The impact of voltage values was chosen as 6, 10, and 14 Volts. On increasing voltage dyes, removals increased significantly. The higher removal efficiency of dyes (99.9%) was achieved at (30) minutes for (Al/Al) electrodes at pH 6.5-7 and voltage 14 Volts. The results showed that the best amount of sodium chloride was found to be 600 ppm in dyes, voltage of 14 Volts, and best gap between the electrodes as 0.5 cm.
Highlights
Dyes are substances that are used in specific industries, such as pharmaceutical, textile, photography, food, and paper, plastics
Dyes can be classified into two classes namely, natural dyes and synthetic dyes
The impact of pH solution on the removal efficiency of the dye was investigated in range 3–10 for reactive congo red at room temperature
Summary
Dyes are substances that are used in specific industries, such as pharmaceutical, textile, photography, food, and paper, plastics. There are several methods used to remove the dye from solution like advanced oxidation process (Georgiou, et al, 2002), biologically pretreated bagasse effluent (Thirugnanasambandham, et al, 2014), reverse osmosis (Abideen, et al, 2015), and nanofiltration (Mo, et al, 2008), showed remarkable record on the treatment efficiency of the textile wastewater. Coagulants are formed by electrolytic oxidation of appropriate anode materials, such as Aluminum, stainless steel, carbon, iron, graphite, etc., which results in the formation of highly charged polymeric metal hydroxyl species. These species neutralize the electrostatic charges on the suspended solids and facilitate agglomeration resulting in separation from the aqueous phase (Patel, et al, 2010).
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