Adding chlorine is an efficient method for disinfection of water. Whether free chlorine, chloramine or chlorine dioxide is added, it
can be removed in an activated carbon filter, before the water is used for process or drinking water purposes.
Activated carbon is a natural product made of organic coal, wood or coconut shells. A wide pore structure is developed after an
activation process with steam or a chemical process,whereby the activated carbon gets an extensive surface area. This area can
grow into a size of 2000 square meters or more per gram of activated carbon.
Removal of chlorine is carried out through a catalytic reaction where the compounds of chlorine are transformed into chlorine ions and carbonic acid. The activated carbon has a very large capacity when removing chlorine, because it only takes part in the process as a catalyst.
DECHLORINATION HALF BED VALUE
The ability of activated carbon to remove chlorine is expressed in the dechlorination half bed value. The carbon type applied
has a dechlorination half bed value of 2-5 cm. That is, when water to be treated has passed through a carbon layer of 2-5 cm in
the filter, the chlorine content is reduced by one-half. This value applies to treatment of neutral utility water.
The capacity of activated carbon is extremely large because of the extensive surface within the internal structure of the pores. However, all water supplies contain organic matters using the capacity of the carbon through direct adsorption or fouling of the carbon. The life of the carbon filling is thus normally one year.
The carbon filters series ACM/ACH are prepared for automatic backwash which helps to keep the carbon as clean as possible. It is important to backwash the carbon with chlorinated water or alternatively with disinfected water, to avoid bacterial growth in the filter.
As mentioned earlier, it is important that the carbon is not fouled, as this reduces the capacity of the carbon. The EUROWATER product program includes a wide range of prefilters, pressure filters with filter bag and sand filters, which meet your needs for prefiltration.
The carbon filters are provided with automatic valves. Series ACM has a EUROWATER valve controlling all the functions during rinse. Series ACH has individual diaphragm valves provided with pilot control.
CORROSION RESISTANT FILTER TANK
The filter tanks are made of steel and are coated with a polyethylene alloy which makes them absolute pore dense. Hereby the strength of the steel and the corrosion resistance of plastics are combined. The pipe systems are made of PVC.
The carbon filters series ACM/ACH are provided with an electronic programmer, type ETP 4B, which at predetermined hours controls the plant through the rinse cycles. Both backwash and quality rinse can be individually programmed.
Carbon filtration has various applications within many industries making special requirements to materials, components and operation of the filters. Consequently, EUROWATER can supply activated carbon filters according to special requirements
e.g. vessels and pipe systems in stainless steel, activated carbon filters suitable for CIP and different types of activated carbon.
However, since these are not included in the EUROWATER standard program, inquiries are considered individually.