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Influence of operating parameters on treatment of egg processing effluent by electrocoagulation process
Sridhar, R.; Sivakumar, V.; Prakash Maran, J. & Thirugnanasambandham, K.
Abstract
The treatment of egg processing effluent was
investigated in a batch electrocoagulation reactor using
aluminum as sacrificial electrodes. The influence of operating
parameters such as electrode distance, stirring speed,
electrolyte concentration, pH, current density and electrolysis
time on percentage turbidity, chemical oxygen
demand and biochemical oxygen demand removal were
analyzed. From the experimental results, 3-cm electrode
distance, 150 rpm, 1.5 g/l sodium chloride, pH of 6,
20 mA/cm2 current density, and 30-min electrolysis time
were found to be optimum for maximum removal of turbidity,
chemical oxygen demand and biochemical oxygen
demand. The removal of turbidity, chemical oxygen
demand and biochemical oxygen demand under the optimum
condition was found to be 96, 89 and 84 %, respectively.
The energy consumption was varied from 7.91 to
27.16 kWh/m3, and operating cost was varied from 1.36 to
4.25 US $/m3 depending on the operating conditions.
Response surface methodology has been employed to
evaluate the individual and interactive effects of four
independent parameters such as electrolyte concentration
(0.5–2.5 g/l), initial pH (4–8), current density (10–30 mA/
cm2) and electrolysis time (10–50 min) on turbidity,
chemical oxygen demand and biochemical oxygen demand
removal. The results have been analyzed using Pareto
analysis of variance to predict the responses. Based on the
analysis, second-order polynomial mathematical models
were developed and found to be good fit with the experimental
data.
Keywords
Aluminum electrode; Biochemical oxygen demand; Chemical oxygen demand; Current density; Turbidity
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