Celle, 10 May 2010 - The water treatment system midiRO CEDI produces pure water that is free of any mineral residues. Using an electrodemineralisation process, this high-performance system manufactured by Berkefeld, a subsidiary of Veolia Water Solutions & Technologies, produces from the permeate of integrated reverse osmosis perfectly demineralised water of a high degree of purity.
CEDI is the abbreviation used for "Continous Electro-Deionisation". This is a highly efficient demineralisation (desalting) process which, with the aid of an electric field and ion-selective membrane, produces water of a permanently high quality. Of particular interest are the Electro-Deionisation (EDIs) systems that are available in standard formats with different output values of between 80 l/h and 650 l/h deionisation for hospitals, such as for sterilisation of surgical instruments, for laboratories, in universities or in the pharmaceutical industry. The combination of reverse osmosis and EDI is also suitable for complete demineralisation of boiler feed water, production or industrial water. Other sizes can be individually configured.
Depending on the water quality required, the desalting cells are installed at one or two levels. In many cases the first level alone is enough as more than 90% of all salts are removed. Equipped with single-level demineralisation, the CEDI systems have conductivity values of less than 0.5 µS/cm and with two-level demineralisation values up to 0.055 µS/cm, corresponding to 18.2 MegOhms. Unlike most mixed-bed ion exchangers used hitherto, the electrical field regenerates the filter material permanently. Hence there is no need to replace the cartridge. The system is characterised by the fact that it requires less maintenance and consumes less electricity and water. Furthermore, with a water yield of more than 90 %, the system needs no chemicals, making it particularly environmentally friendly. In the course of pure water production, any microorganisms present are reduced by more than 99% and the total organic carbon (TOC) is reduced.
