Study of Electrocoagulation mechanism on dairy wastewater for COD and Turbidity removal
Keywords:
Electrocoagulation, iron electrode, aluminium electrode, COD, turbidity.Abstract
The removal of COD and turbidity from dairywastewaterwas experimentally investigated
using direct current electrocoagulation (EC). In the EC of dairywastewater, the effects of initial pH,
electrolysis time, voltage and different electrodes were examined.The batch experimental results
revealed that the removal efficiencies of the overall turbidity, COD depend on the nature of the electrode
material. The optimum operating range for each operating variable was experimentally determined.The
greatest removal efficiency was obtained with the use of aluminium as anode and iron as cathode (Al–Fe
system).With this latest system, optimal values of voltage, initial pH, boric acid concentration and
electrolysis time were 5V, 6.0, 5 g/L and 10 min respectively. The batch experimental results revealed
that COD and turbidity in aqueous phase was effectively removed. The overall COD and turbidity
removal efficiencies reached 92.6% and 95.2%, respectively. The Mean energy consumption was 0.0003
kWh/kg of COD removed
