Estimating nitrifying biomass in drinking water filters for surface water treatment

The objective of this work is to estimate active nitrifying biomass and its main influencing factors in low-loaded biofilters based on operational data. An analytical approach based on balancing growth, decay and biomass removed by backwashing is proposed. The method is developed and applied in pilo...

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Veröffentlicht in:Water research (Oxford) 2008-05, Vol.42 (10-11), p.2574-2584
Hauptverfasser: Tränckner, Jens, Wricke, Burkhard, Krebs, Peter
Format: Artikel
Sprache:eng
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Zusammenfassung:The objective of this work is to estimate active nitrifying biomass and its main influencing factors in low-loaded biofilters based on operational data. An analytical approach based on balancing growth, decay and biomass removed by backwashing is proposed. The method is developed and applied in pilot-scale rapid sand filters for drinking water treatment. Decay rate was measured directly in the filter for different temperatures. To assess the amount of active biomass in backwash water, a technique based on respiration measurements was used. Backwash losses increased overproportional with balanced biomass in the filter. The impact of both parameters on active biomass is quantified exemplarily for a given constant nitrification rate.
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2008.01.007