Nitrification and Phosphorus Precipitation with Biological Aerated Filters

The biological aerated filter is an innovative technology that combines aerobic degradation of pollutants and physical retention of suspended matter in one reactor. A high concentration of active biomass can be achieved in the packed bed reactor, and nitrifying bacteria can be retained on the filter...

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Bibliographic Details
Published in:Research journal of the Water Pollution Control Federation 1990-03, Vol.62 (2), p.169-176
Main Authors: Rogalla, Frank, Payraudeau, Michèle, Bacquet, Gilles, Bourbigot, Marie-Marguerite, Sibony, Jacques, Gilles, Pierre
Format: Article
Language:English
Subjects:
Ammonia
Biochemical oxygen demand
Chemical oxygen demand
Nitrification
Phosphorus
Research Papers
Sewage
Sewage effluent
Wastewater
Wastewater treatment
Water pollution
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Summary:The biological aerated filter is an innovative technology that combines aerobic degradation of pollutants and physical retention of suspended matter in one reactor. A high concentration of active biomass can be achieved in the packed bed reactor, and nitrifying bacteria can be retained on the filter media, allowing ammonia oxidation independently of sludge age. The options of phosphorus and nitrogen removal with biological aerated filters were explored with semi-industrial pilot plants. Examples of full-scale plants, designed according to collected data, are given. Phosphorus was precipitated with iron salts in lamella settlers before aerated biofilter treatment. The efficiency of settling and biological treatment was related to hydraulic and operational parameters. Nitrification can be achieved by reducing the carbonaceous load on the biofilter. The limits of loading were verified to obtain a final effluent quality of around 1 mg/L each of phosphate-P and ammonia-N, and 10 mg/L each of BOD and SS. The results of a full-scale nitrifying biofilter and of a highly loaded aerated biofilter plant with seasonal pollution variations are presented.
ISSN:1047-7624