Abstract: Landfill leachate recirculation treatment process is a promising and
economic way in northeast China due to the distinct season variation. In order
to study the impact of recirculation on leachate production and its quality,
two simulated sanitary landfill reactors, one with leachate recirculation and
the other without, were placed outdoor in Harbin. The two-year experimental
results indicated that leachate production was reduced by 86% with leachate
recirculation and less or no facility for leachate treatment required.
Recirculation could improve the leachate quality dramatically with lower COD,
SS, NH^4_+-N and higher pH level. Recirculation also could
enhance waste degradation and stabilization and improve the efficiency of
landfill. This study confirmed that leachate recirculation was a very feasible
way for on-site landfill leachate treatment in cold areas.