Ali pakfetrat - Department of Environmental Health Engineering, School of Public Health, Student Research Committee, Gonabad University of Medical Sciences, Gonabad, Iran
Seyed Ali Sajjadi - Department of Environmental Health Engineering, School of Public Health, Social Development & Health Promotion Research Center, Gonabad University of Medical Sciences, Gonabad, Iran
Morvarid Irani - Department of midwifery, School of nursing and Midwifery, Mashhad University of Medical Sciences, Mashhad, Iran

Background and Objective: Colored discharge effluent into aquatic ecosystems may be carcinogenic and mutagenic besides aesthetic problems. In this work, the ability to remove (Remazol Black B) colored water using electrocoagulation process is equipped with iron and aluminum electrodes with bentonite as a coagulant aid and natural adsorbent has been investigated. Materials and Methods: Remazol Black B was selected as a model dye and the treatment process was performed in a batch of electrocoagulation (EC) cell using iron and aluminum electrodes and bentonite. Experiments were conducted under 5 levels of various operational parameters at bench scale. The initial dye concentration was varied between 200-1200 mg/L, pH ranging from 2-10; the retention time was between 0-60 minutes, the voltage studied was in the range of 5-30 V and the electrical conductivity was 0.25 to 2 Siemens/cm.Findings: Results showed that the use of electro-Aluminum and Iron, under optimum conditions of pH 2 and 4, concentration of dye1000 mg/L, voltage of 30 V and 30 min have the maximum dye removal of about 99% and 91%, respectively. Results showed that both electrode voltages increase the efficiency of the above process in paint removal with decreasing pH from 10 to 2 and increasing the voltage from 5 to 30 V.Conclusion: Results show that by electrocoagulation Process Coupled with Bentonite as an Aid Coagulant could be used as well as an effective method for dye removal from colored wastewater.

Bentonite, Electrocoagulation, Iron Electrodes and Aluminum Electrodes, Color Removal, Remazol Black B