Electrocoagulation (EC) for Reduction of Chemical Oxygen Demand (COD) of Surface Water

Abstract

Karnopara Canal water containing high COD values (1050 mg O2/L) was treated by electrocoagulation (EC) method covering a wide range of operating conditions such as, water pH, internal electrode distances, final pH, supplying 30V electricity for constant time period (30 minutes) through same electrode material (Al electrode). The effects of different operating parameters on the efficiency of the process were examined. Targeting to reduce the COD value within the recommended limit (200 mg O2/L), this research work was emphasized on EC treatment at the simplest and cheapest way. The batch experiment results showed that the high COD contained canal water can be effectively treated using electrocoagulation. The overall COD removal efficiencies have been obtained at 87.3%, under optimum operating conditions. Taking all the factors into account, it was found that polluted Karnopara canal water can be treated using EC consisting of Al electrodes without pre-adjustment of pH at laboratory. Therefore, EC technique to reduce high COD from canal surface water is found effective, cheaper and environmental friendly. DOI: http://dx.doi.org/10.3329/bjsir.v47i1.10728 Bangladesh J. Sci. Ind. Res. 47(1), 77-82, 2012

Removal of Lead from Battery Effluent by Electrocoagulation

“…Electrocoagulation (EC) process has attracted a great attention in treating industrial wastewaters because of its versatility and environmental compatibility. This method is characterized by easy and safe operation with simple equipment set-up, relatively cheap, energy efficient, a shortened reactive retention period, and importantly not suffers from overburden of sludge production (Islam et al 2011a, Mollah et al 2004, Rahman et al 2012b. Moreover, during EC, the salt content of the liquid does not increase appreciably, as in the case of chemical treatment.…”

“…Moreover, during EC, the salt content of the liquid does not increase appreciably, as in the case of chemical treatment. EC is a proved efficient, effective and reliable technology used for treating various process effluents (Islam et al 2011a, b, Rahman et al 2011b, 2012b. But, there is no literature to treat Pb from battery industry effluent by EC.…”

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“…Although textile and dyeing sector is a vital part of economic development, speedy and unplanned progress may result in a wide impact on natural resources and human being living within the close vicinity of the sludge disposal locations [1][2][3]. Electrocoagulated Metal Hydroxide Sludge (EMHS) produces during the treatment of waste effluent of the industry by electrocoagulation (EC) technique [4], where sacrificial anodes made of aluminum or iron corrode to release active coagulant precursors [5][6][7]. Coagulant produces insoluble metallic hydroxide flocs which can remove pollutants by surface complexation or electrostatic attraction [8,9].…”

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