Removal of enriched-leachate from RO unit for landfill leachate with electrolytic process

摘要

In this article, electrolytic processes including electrolytic oxidation and flotation were used to treat enriched-leachate from RO unit for landfill leachate. The chanracteristics of the enriched-leachate ar COD 6393 mg/L, BOD 196 mg/L Cl 12700 mg/L and deep-brown color. The enriched-leachate is refracgory pollutant for low BOD/COD ratio. This study intended to apply the indirect electrochemical oxidation process to treat refractory pollutants (lechate). The experiment results showed that the deep-brown color enriched-leachate became light-yellow in 4 hours operation time by elecrolytic oxidation. COD of the leachate could be reduced from 6396 mg/L to 1066 mg/L after 8 hours electrolysis by using PbO_2/Ti anode. It meaned that the electrolytic process is easy in operation and it may gives good effeciency in refractory pollutants removal. The operation parameter such asL: current densitym, chloride concentration, reaction time and electrode interval were a lso investigated to find out their influence.