STUDY ON USING ALUMINIUM AS ELECTRODES IN AN ELECTRO-COAGULATION SYSTEM IN ORDER TO REMOVE COD OF NAM SON LANDFILL LEACHATE

Abstract

Landfill leachate with very high and fluctuant concentrations and complexe composition of pollutants, so it was classified as difficult - to- treat pollutant. An electro-coagulation system of volume 1.8 L using 4 pairs of aluminum electrodes (size 110 cm x 100 cm) and a DC power source studied in the laboratory to pre-treat Nam Son landfill leachate in order to significantly reduce the amount of organic compounds, so facilitate the biological post-treatment .... The results have shown that electrical current, electrolysis time, pH, distance between electrodes were the parameters which strongly influence the organic pollutant removal efficiency in Nam Son landfill leachate by an electro-coagulation process. The COD removal efficiency increased when electrical current, electrolysis time, distance between electrodes decreased and pH in neutral range.The optimum conditions for electro-coagulation process to treat COD of  Nam Son landfill leachate were: I = 3A, t = 60 minutes, pH = 7, the distance between electrodes was 1 cm. However, the COD removal efficiency by the EC system using aluminum electrodes is not high, under the optimal conditions, only 45% of COD was removed.