Inderscience Publishers

Primary treatment of anaerobic landfill leachate using activated carbon and limestone: batch and column studies

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Leachate generated from an old landfill in Taiping, Perak, Malaysia contains high colour, COD, iron and ammoniacal nitrogen. Activated carbon?limestone mixture was used as a primary treatment process. More than 86% of colour and COD, 95% of iron, and 48% of ammoniacal nitrogen were removed by a mixture of activated carbon and limestone (15:25 by volume) in the batch study compared with 70, 80 and 90% respectively, by column study on the first five days. Both Langmuir and Freundlich isotherms had fitted well with the experimental data. The adsorption kinetics followed the pseudo-second-order model indicating that chemisorption or ion exchange was the rate-controlling step in the adsorption.

Keywords: adsorption kinetics, limestone, activated carbon, anaerobic landfill, leachate treatment, colour removal, iron removal, COD removal, chemical oxygen demand, nitrogen removal, ammoniacal nitrogen, old landfills, landfill leachate, Malaysia, chemisorption, ion exchange

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