Abstract

Biological filtration is an effective technique for removing organic matter from wastewater. The perfor- mance of a biofilter can be influenced by a range of operational conditions. In this study the performance of biofilters was investigated for the influence of filter media depth, influent concentrations, filtrations rates and backwashing. The results show that performance of GAC filters decreased with shallower filter bed depths. In addition, the GAC per- formed better at lower influent concentration and lower filtration rates. The daily backwash adopted to avoid the phys- ical clogging of the biofilter did not have any significant effect on the organic removal efficiency of the filter. The con- centration, activity and characteristics of the biomass are quantified and described. A mathematical model was devel- oped to simulate the organic removal of the GAC biofiltration system. The performance of the GAC filter under dif- ferent influent organic concentration levels, filtration rates and filter bed depths was adequately simulated by the math- ematical model developed for this study.

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