Abstract

Shruthi Murthy*¹, Mahesh Shivaswamy¹, Sahana Mahesh¹ and Srikantha Hanumanthappa²

DOI : http://dx.doi.org/10.13005/ojc/350110

Aluminum(Al) and Iron(Fe) electrodes were used forsimultaneous removal of arsenite and fluoride from groundwater using novel electrochemical coagulation (ECC)with special focus on electrode placing positions of Fe and Al in a batch electrochemical reactor (BECR).A series of experiments were carried out to observe the influence of electrode placing positions on removal. Of the many electrode combination, Al₁-Al₂-Al₃-Al₄, Fe₁-Fe₂-Fe₃-Fe₄, Al₁-Al₂-Fe₃-Al₄ and Fe₁-Fe₂-Al₃-Fe₄ are discussed in this paper for pre-optimized operating conditions: 4 plate electrodes, As (III)_o: 1.6 mg/L, F_o‾: 12 mg/L, Al³⁺: 0 mg/L, Fe_o: 0.061 mg/L, inter-electrode spacing: 5mm, applied cell voltage:16V, SA/V ratio: 40 m²/m³ and electrolysis time of 45 min. For the said electrode combinations,the maximum simultaneous removal of both arsenite and fluoride was obtained for Fe₁-Fe₂-Al₃-Fe₄ with 97% arsenite removal from its initial value of 1.6 mg/L; and 100% fluoride removal from its initial value of 12 mg/L within 45 min of ET. Energy consumption was 2.01 KWh/m³ with operating cost of 2.90 Rs./m³.

Aluminum; Arsenite Andfluoride Removal; Electrode Placing Position; Iron Electrodes

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