LETTERS TO EDITORS
Water Retention Time in Intermittently
Dosed Sand Filters
R. Błażejewski, S. Murat-Błażejewska
Department of Land Reclamation and Environmental Engineering,
University of Life Sciences, Piątkowska 94A, 60-649 Poznań, Poland
Pol. J. Environ. Stud. 2009;18(2):289–292
KEYWORDS
ABSTRACT
This paper presents a simple theoretical approach to calculating of the retention time of water and/or
wastewater in intermittently dosed filters. It assumes that a single dose of water is completely mixed with the
previously stored water in the filter and that the field capacity of the granular medium is achieved before the
next wastewater application. Retention time is weighted by the water volume stored within the filter. It is presented
in a discrete form. The model was successfully validated on the basis of empirical data gathered by
Schudel and Boller.
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