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Removal of Heavy Metals (Cr, Cu, and Zn) From Electroplating Wastewater by Electrocoagulation and Adsorption Processes Publisher



Ayub S1 ; Siddique AA1 ; Khursheed MS1 ; Zarei A2 ; Alam I1 ; Asgari E3 ; Changani F4
Authors
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Authors Affiliations
  1. 1. Department of Civil Engineering, AMU, Aligarh, UP, India
  2. 2. Department of Environmental Health Engineering, School of Public Health, Social Determinants of Health Research Center, Gonabad University of Medical Sciences, Gonabad, Iran
  3. 3. Department of Environmental Health Engineering, Khoy University of Medical Sciences, Khoy, Iran
  4. 4. Department of Environmental Health Engineering, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran

Source: Desalination and Water Treatment Published:2020


Abstract

Heavy metal intrusion into the water systems is a global environmental problem. Rivers, lakes, and ponds are usually contaminated by direct discharge from industries and these contaminants may leach into groundwater systems via the transport mechanisms. While some of the heavy metals are essential for the metabolic activities of living organisms but their presence in high concentrations in water may be very hazardous. The present study deals with the removal of trace metals includ-ing chromium (Cr), copper (Cu), and zinc (Zn) using electrocoagulation and adsorption techniques. The removal of Cr, Cu, and Zn was found to increase with the increase in electrocoagulation time, sodium chloride concentration and applied an electric current. The optimum conditions evaluated were pH around 4, applied electric current 2 A, and 60 min of electrolysis time. This experimental study showed that under the optimal conditions, 87.6% Cr, 100% Cu and 99.2% Zn were successfully removed. The adsorption percentages of these ions by TiO2:AC increased sharply by increasing adsorbent dose. The results show that an optimum dose of 5 and 4 g/L of TiO2:AC can remove about 97% Cr(VI), 97.45% Cu, and 96% Zn from the wastewater sample containing initially 50 mg/L concentration of each heavy metal. Electrocoagulation and TiO2:AC exhibited a high degree of Cr, Cu, and Zn removal and therefore they can be utilized for the treatment of industrial effluents. © 2020 Desalination Publications. All rights reserved.
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