Modeling of Biofiltration of Natural Organic Matter in Drinking Water Treatment

by Jack Z. Wang, Univ of Cincinnati, Cincinnati, United States,
R. Scott Summers, (M.ASCE), Univ of Cincinnati, Cincinnati, United States,

Document Type: Proceeding Paper

Part of: Critical Issues in Water and Wastewater Treatment


A multi-substrate model of the biofiltration of natural organic matter in drinking water was developed and successfully applied. This model assumes that biofiltration is a two-step process in which external mass transfer is followed by surface bioreaction. The Monod-type bioreaction rate is used and mass transfer resistance due to the microbial biomass is neglected in this model. The natural organic matter is fractionated into fast-, slow- and non-biodegradable components. The sensitivity of this model to each of the individual parameters indicates that the biodegradation of natural organic matter in drinking water biofilters is controlled by the surface bioreaction rate. Comparison of the model predictions to experimental results indicates that this model works well over a wide range of hydraulic loading rates.

Subject Headings: Biological processes | Filtration | Organic matter | Water treatment | Mathematical models | Mass transfer | Hydraulic models

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