Co-bioevaporation treatment of concentrated landfill leachate with addition of food waste

Abstract

In this study, concentrated landfill leachate (CLL) from two-stage DTRO (Disk-Tube Reverse Osmosis) process was treated by co-bioevaporation process with addition of food waste (FW) as the supplementary carbon source. A series of experiments were conducted to explore the feasibility and critical factors of the co-bioevaporation treatment of CLL and FW. The results indicated that the simultaneous removal of water and organic matters contained in CLL and FW mixture was effectively achieved in the co-bioevaporation process, and when the CLL and FW mixing ratio was 1:1.10 (mCLL:mFW), 85.67% of the added water can be evaporated by complete consumption of the organics. Initial moisture content (MC) of 33.9%, dosage of 90%, and air-flow rate (AFR) of 0.035m3 kg-1TS h-1 were found to be the optimal operating conditions. Water evaporation of 96.7% and volatile solids (VS) consumption of 96.5% were obtained under those optimal conditions during five cycles of co-bioevaporation process.