Using Horizontal Roughing Filter as an Effective Post-Treatment System for Palm Oil Mill Effluent (POME): Effect of Media Sizes and Filtration Rates
Ali Huddin Ibrahim,
Mohd N. Adlan,
Arezoo F. Dashti.
In this study, palm oil mill effluent (POME) from polishing pond of palm oil mill treatment plants has been
chosen to be treated in laboratory experiment using horizontal roughing (HRF) filter system. The purpose of this article
was to evaluate the effect of three filter media sizes on the removals of COD, NH3-N and turbidity and as well as to
evaluate the effect of three filtration rates on the removal of color, turbidity and suspended solid from POME using
limestone media in HRF system. The results indicated that the removal of smaller filter media gave higher removal
efficiency and larger size of filter media gave lower removal efficiency. Optimum removal of COD, NH3-N and turbidity
were 27%, 51% and 32%, respectively, which were obtained at lowest filter media size (i.e. 3-6 mm). Similar result was
also obtained in studying the effect of filtration rates. It was found that the optimum reduction of turbidity, suspended
solid and color were up to 38.6%, 57.4%, and 34.5%, respectively, at lowest filtration rates of 0.3 m h-1. These results
were supported by one-way analysis of variance (ANOVA).
Keywords: Color, removal of COD, NH3-N, suspended solid, turbidity.
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