The use of a Biological Fluidized Bed (BFB) was evaluated in a large demonstration plant for nitrification of a secondary effluent at Horley STW (South of London). The BFB was operated over a range of flows from 250→600 m3/d using effluents containing 25mg NH3-N/ℓ, 18mg BOD/ℓ to define the optimum operating conditions. It was possible to reduce from 27 down to 3mg NH3-N/ℓ in a contact time of only 38 mins (a volumetric loading of 1 kg NH3-N/m3.d). The unit was then operated under diurnal flow. A 20m deep below-ground downflow-bubble-contact oxygenator was used which was capable of dissolving 60mg 02/ℓ. Following the technical evaluation, an economic comparison was made between using the add-on nitrifying BFB against the option of extending an existing activated sludge plant. The BFB had a lower capital cost but higher operating cost. The BFB was shown to be cost competitive.
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Research Article| January 01 1990
High-Rate Nitrification in a Biological Fluidized Bed
Water Sci Technol (1990) 22 (1-2): 431–442.
P. F. Cooper, S. C. Williams; High-Rate Nitrification in a Biological Fluidized Bed. Water Sci Technol 1 January 1990; 22 (1-2): 431–442. doi: https://doi.org/10.2166/wst.1990.0167
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