Sequential treatment of an old-landfill leachate Online publication date: Wed, 22-Jul-2009
by Flavia S.F. Rodrigues, Daniele M. Bila, Juacyara C. Campos, Geraldo L. Sant'Anna Jr., Marcia Dezotti
International Journal of Environment and Waste Management (IJEWM), Vol. 4, No. 3/4, 2009
Abstract: This work investigates the performance of combined techniques applied to the treatment of an old-landfill leachate, which presents high salinity, low biodegradability (BOD5/COD around 0.05) and high ammonia concentration. Three sequences of processes were employed, including coagulation/flocculation, chemical oxidation, biological treatment and ammonia stripping. The association of coagulation/flocculation with ozonation promoted an increase on landfill leachate biodegradability (BOD5/COD raised to 0.20). Ammonia stripping was an essential procedure for reducing toxic effects on the biological treatment step. The treatment sequence combining coagulation/flocculation, ammonia stripping, ozonation and biological treatment led to high global removals of COD (92%) and DOC (95%).
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