Boron Removal from Aqueous Solutions by Electrocoagulation at Low Concentrations

Dolati, M and Karimzadeh, S and Khorsandi, H and Aghapour, A.A (2017) Boron Removal from Aqueous Solutions by Electrocoagulation at Low Concentrations. Journal of Environmental Chemical Engineering. pp. 1-21.

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Abstract

Boron can cause gastrointestinal dysfunction, blood circulation disorder, and reproductive problems. In this research, the effect of some parameters on the efficiency of treatment system is studied in detail. These parameters include pH, distance between electrodes, current density, reaction time, initial concentration of boron, and interference effect of common anions in water including carbonate, sulfate, and chloride. The boron concentration in the samples is determined by standard method. The efficiency of electrocoagulation for boron removal at a concentration of 100 mg/L and under optimal condition (pH: 8, distance between electrodes: 10 mm, reaction time: 60 min, concentration of 100 mg/L and current density: 5.5 mA/Cm2) is good (about 70%). Boron adsorption isotherm on produced aluminum according to Faraday's law corresponds to isotherms of Langmuir (R2 = 0.77) and Freundlich (R2 = 0.79). Boron adsorption kinetics on produced aluminum corresponds to the pseudosecond-order model (R2 = 0.99). Interfering effect of carbonate ions is more than other anions in water such as chloride and sulfate. The addition of two moles of carbonate ions can reduce the efficiency of the process by 15%. Therefore, unlike the chemical coagulation process, using pre-treatment processes for the initial adjustment of pH in water using limewater due to an increase of carbonate in water can decrease the efficiency of electrocoagulation. Electrocoagulation process can be used for treatment of boron- polluted water and wastewaters containing boron at initial concentrations of more than 50 mg/

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