Satisfying EU requirements
The ABF which is essentially a sand filter, ensures that the effluent of the waste water treatment plant satisfies the requirements of the European Water Framework Directive. Sand filtration is an energy-efficient and sustainable way to further reduce the phosphate contents of the effluent from the water treatment system. This lower phosphate contents in turn means there is less food for the algae and consequently reduces them. The end goal is clear water with a wide variation of plants and animals.  

The workings of the ABF
An ABF-installation consists of various separate, adjacent cells filled with filter material, usually sand, and is very suitable for removing phosphate. Water flows downwards through these various cells of the filter bed. A moving bridge structure then directs water upwards through these individual cells. The limited surface area per cell eliminates the need for clean and dirty rinse water buffer tanks, this reduces the investments cost of the system and makes it an efficient and effective process.


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