Pretreatment of landfill leachate with corrosive cell-Fenton process

Instead of using FeSO_ 4 for the traditional Fenton process, new state of Fe 2+ ions generated by corrosive cell process between iron scraps and granular activated carbon (GAC) were utilized to pretreat landfill leachate. The results indicated that, under the optimal conditions that pH was 2, the quantity of H_ 2O_ 2 was 50% of theoretical dose, iron scrap was 3 g (in 500 mL leachate), the mass ratio of Fe/C was 2.5, the reaction time was 1 h, and the pH of flocculation was 7, COD and TOC removals were 60% (19% due to GAC adsorption) and 47% (13% due to GAC adsorption), respectively. BOD_ 5/COD ratio was increased from 0.35 (raw leachate) to 0.69 (treated water). While under the H_ 2O_ 2/Fe 2+ mass ratio of 5 and other similar conditions, COD and TOC removals were 26% and 19% respectively, BOD_ 5/COD ratio was increased from 0.43 (raw leachate) to 0.69 (treated water) for the traditional Fenton process. Obviously, corrosive cell-Fenton process has better performance than the traditional Fenton process for pretreating landfill leachate in organic removal and biodegradability increase.