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Leachate Recirculation

Leachate recirculation is defined as the action of  a landfill operator who seeks to minimize leachate treatment cost and maximize landfill gas production of a landfill by pumping the leachate collected from a landfill drainage system and delivering it to the top of the landfill surface from which point the leachate recirculates through the landfill eventually re-appearing at the base of the landfill once again.
If while the recirculation takes place the waste in the landfill is in a methanogenic (landfill gas producing) condition the leachate will be partially anaerobically treated so that the BOD (and COD as a result) will be reduced, making the demand for oxygen during biological treatment much less and saving on aeration equipment costs.

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