Biological Aerated Filter

The biological aerated filter, BAF, was a new process developed around 1990s based on conventional biological filter and filters for potable water treatment, which was applied as tertiary treatment process at first and then developed as secondary treatment process. This process combines biological oxidation and filtration together in one structure, which eliminates the need for a secondary sedimentation.

Key Features and Benefits

  • High concentration of contaminant and organic load

  • Low infrastructure investment, low operation cost and energy consumption

  • Bio-film forms easily which allows early commissioning

  • Short hydraulic retention time and small tank footprint

  • Low infrastructure investment, low operation cost and energy consumption

  • Up to 98% SS removal

  • Up to 95% BOD5 and 90% COD removal

  • KWI offers BAF specific aerator; air flow rate up to 0.43 m3/h

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BAF is applied as a form of secondary treatment and tertiary treatment in the following applications

  • Municipal sewage

  • Food processing wastewater

  • Brewery wastewater

  • Papermaking wastewater

  • Printing and dyeing wastewater

  • Upgrading of sewage and wastewater treatment plant

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