A Sequential Aerated Peat Biofilter System For
The Treatment Of Landfill Leachate
Author(s)
P. Champagne & M. Khalekuzzaman
Abstract
In recent years, researchers have identified peat as an alternative low-cost filter
medium for on-site wastewater treatment, including landfill leachate. Peat
possesses several physical, chemical and biological characteristics that make it a
favorable filter medium for the mitigation of contaminants. The effectiveness
and the impact of clogging of peat biofilter in terms of organic (COD, CBOD5),
ammonia (NH3-N) and total suspended solid (TSS) loading are crucial in the
operation of such systems. The main purpose of this research was to evaluate the
performance of a bench-scale sequential aerated peat biofilter system treating
landfill leachate at different hydraulic loading rates (HLRs) under continuous
flow condition. The system consists of two major components: an aeration
chamber with an attached growth media, followed by a peat biofilter. The
leachate was aerated at a constant air flow rate of 3.40 m3/day for a hydraulic
retention times (HRTs) of 2 or 5 days. The aerated leachate was then fed to two
sets of triplicate peat columns, which were operated at average HLRs of 8.28
cm3/cm2/day and 10.82 cm3/cm2/day. The result of the study showed that similar
CBOD5, COD, NH3-N and TSS removal efficiencies and column life
expectancies could be obtained from the two different hydraulic loading rates to
the peat biofilter. However, the HRT in the aeration basin was found to
significantly increase the life expectancy of the peat biofilter by reducing the
overall contaminant loading to the biofilter. For a HRT of 5 days and constant air
flow rate of 3.4 m3/day 99% NH3-N was removed in the aeration tank after 3
weeks. Removal efficiencies above 80%, 90% and 86 % were noted for COD,
CBOD5 and NH3-N, respectively, in the peat columns after 6 weeks of operation.
Keywords: peat, landfill leachate, aeration, biofilm, hydraulic loading, leachate
treatment.
Keywords
peat, landfill leachate, aeration, biofilm, hydraulic loading, leachatetreatment.
Related Book
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