NEW APPROACH TO MODELLING OF SAND FILTER CLOGGING BY SEPTIC TANK EFFLUENT
1
Faculty of Land Reclamation and Environmental Engineering, University of Life Sciences in Poznan, Wojska Polskiego 28, 60-637 Poznań, Poland
Publication date: 2016-04-01
J. Ecol. Eng. 2016; 17(2):97-107
KEYWORDS
cloggingfilter coefficientmathematical modellingsand filtersolids depositionsuspended solidsbiofilm processes
ABSTRACT
The deep bed filtration model elaborated by Iwasaki has many applications, e.g. solids removal from wastewater. Its main parameter, filter coefficient, is directly related to removal efficiency and depends on filter depth and time of operation. In this paper the authors have proposed a new approach to modelling, describing dry organic mass from septic tank effluent and biomass distribution in a sand filter. In this approach the variable filter coefficient value was used as affected by depth and time of operation and the live biomass concentration distribution was approximated by a logistic function. Relatively stable biomass contents in deeper beds compartments were observed in empirical studies. The Iwasaki equations associated with the logistic function can predict volatile suspended solids deposition and biomass content in sand filters. The comparison between the model and empirical data for filtration lasting 10 and 20 days showed a relatively good agreement.
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