CFAS® (Combined Fixed Film Activated Sludge) - IFAS


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The process

The Biowater CFAS® (IFAS) utilizes the benefit of a traditional activated sludge process combined with a biological fixed-film system to create a highly efficient wastewater treatment plant in a much smaller footprint.

The process begins with the introduction of polyethylene biomass carriers into the activated sludge.
The activated sludge removes the majority of the BOD while the biofilm is allowed to grow in the protected biomass carrier.
The biomass in turn oxidizes the ammonia.

The Biowater CFAS® (IFAS) is particularly well suited for retrofitting existing activated sludge plants to add nitrification as well as increasing the BOD removal in the same tank. The Biowater CFAS® IFAS is also perfect for use in new construction.


Upgrade of existing activated sludge plants to achieve nitrification.
Compact - Doubles the capacity of an existing Activated Sludge plant. For new plants the footprint is very small. For retrofits existing tanks can be used.
Flexible - BOD, Nitrogen and Phosphorus removal can be included.
Stable - Self regulating biofilm ensures stable treatment under variable loads. No clogging.
Sludge Production - Produces sludge with low sludge volume index. This is efficient for following separation and sludge treatment processes.
Low Capital Cost

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CFAS® case: Harestua, Norway


CFAS® case: Trysil, Norway


CFAS® case: Tainan, Taiwan


NEWSFLASH: Biowater Technology is pleased to announce that the company has been awarded its largest order for Biowater’s new cost effective CFIC® biofilm wastewater treatment system. The order comes from one of the leading private food manufacturers in the US.