Biological Activated Filtration (BAF) uses sessile microorganisms in order to remove organic compounds (BOD, COD) and nitrogen from wastewater and polluted surface water.

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Clay based beads allow the growth of different organisms in an upstream operated reactor system. As nutrients are usually present in the water only air for oxygen supply has to be injected. Here, the uniform distribution of air and water is the key-factor.

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Nitrification is going along with carbon-removal, at lower reaction time. The two processes can be implemented in one single reactor or can be splitted in two separated filter stages. For denitrification, a separate, anoxic filter (without process aeration) is used. A carbon source as a virgin wastewater stream or dosage of an external carbon source is required. Then, a final BAF could be used for final polishing, degrading remaining organic compounds.

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Our know-how in this field is based on various references and a PhD-Thesis by our process responsible. References include municipal wastewater treatment, effluent polishing as well as a pretreatment of highly loaded surface water.