A bench-scale sequential aerated peat biofilter system was developed and evaluated for the treatment of landfill leachate under varying contaminant loading and hydraulic loading rates. This system consisted of two major components: an aeration chamber with an attached growth media and a peat biofilter. In this study, the leachate from the aeration tank, with hydraulic retention times of 5 and 2 days, and constant air flow rate of 3.40 m3/day was fed to two sets of triplicate peat columns, which were operated at average hydraulic loading rates of 8.28 cm3/cm 2/day and 10.82 cm3/cm2/day. The result of this study showed that similar organic (COD, CBOD5) removal performances and life expectancies could be obtained from these two different hydraulic loading rates. However, the higher hydraulic retention times in aeration basin could significantly increased the life expectancy of the peat biofilter by reducing contaminants loading.
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