Estimating nitrifying biomass in drinking water filters for surface water treatment |
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Authors: | Tränckner Jens Wricke Burkhard Krebs Peter |
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Affiliation: | Institute for Urban Water Management, Dresden University of Technology, 01062 Dresden, Germany. jens.traenckner@mailbox.tu-dresden.de |
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Abstract: | 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. |
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Keywords: | Ammonia Backwashing Biofilter Biomass Decay Temperature |
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