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Author:admin Date:2023-11-08 21:30:08 Hits:

Activated carbon filter  

Activated carbon filters are used for dechlorination  and adsorption. Dechlorination is a very rapid  process, in which the activated carbon participates  in the reaction and the free chlorine is converted to  chloride. The reaction takes place within seconds in  the upper 10 cm of the filter bed. 

In the case of adsorption, which is used for THM  removal (tri-halo-methane) or the elimination of  unwanted odour and colour, the activated carbon  filter is used as a chromatographic bed. Depending on  the concentration and the polarity of the constituents  to be removed and their mutual interference, the  contact time is determined which is typically between  8 and 20 minutes. 

 For THM adsorption monitoring of the treated water  quality is required. At breakthrough, the carbon  must be replaced immediately. New plants are  equipped with steam devices to strip out the volatile  components at high temperatures of 140°C. This  operation extends the life of the carbon up to five  times.  

Furthermore it is important to construct the filter  vessel so that proper sterilisation with either hot  water (min. 95°C) or steam (up to 140°C) is possible.  The only suitable material is stainless steel, whose  quality is selected depending on the chloride content  of the water. In addition, a nozzle plate for even  distribution of clean water and steam across the  carbon bed should be installed, and the nozzles  should be covered with filter gravel.


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