Demineralisation plants (DM-plants) |
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You are here: Start page > Products > Demineralisation plants Demineralisation plants (DM-plants)Demineralisation plants produce demineralised water of highest quality
DemineralisationWith demineralisation by ion exchange dissolved
salts are removed from the untreated water The 2-column principleThe unit consists of a column with strongly acid cation exchange resins followed by a column with strongly alkaline anion exchange resins, regenerated with hydrochloric acid resp. sodium hydroxide. During passage through the columns, the salts dissolved in the raw water are exchanged with hydrogen and hydroxyl ions, forming water together. Design of the installationThe installation consists of two polyethylene covered filter tanks with ion exchange materials. The connecting pipe system is made of PVC with manually operated drain and rinsing valves. The tank is also equipped with a 4-cycle-valve for the regeneration. The conductivity of the demineralised water can also be read on a measuring device in the range of 0 – 50 µS. RegenerationWhen the plant capacity is exhausted, it is regenerated with hydrochloric acid and sodium hydroxide. The programmed regeneration is initiated and consists of the following cycles: Backwash, draw of acid and sodium hydroxide, rinse. The regeneration takes approx. 2 hours. OperationThe conductivity of the demineralised water increases at the end of an operating phase and the unit is switched off by closing the drain valve. Then regeneration is started by pressing the start button. When regeneration is completed the unit is rinsed in order to achieve the required water quality. Storage tanks for acid and sodium hydroxideAcid and sodium hydroxide can directly be aspired from the original containers. If requested, the plant may be delivered with special polyethylene storage tanks. CirculationVery low flow per minute or standstill can cause an increase in the conductivity and thereby unnecessary regenerations. The installation can be supplied with a circulation pump, eliminating this problem. Plant capacityThe basic capacity is valid for ordinary clean waterworks water with a moderate salt content, and states the quantity of water – with a total salt content equivalent to one degree of German Hardness (1°GH) – which can be demineralised per regeneration. The actual capacity between the regenerations is found by dividing the basic capacity of the installation by the ion content in the raw water, measured in equivalent hardness. Water qualityThe conductivity of the demineralised water is normally between 5 and 30 microsiemens. This quality is satisfactory for most industrial processes. If a higher quality is required, the plant can be combined with a mixed-bed exchange unit. InstallationPay attention to local regulations. Drain water neutralizationFor the neutralization of the acid and alkaline waste waters of the plant we can offer several solutions. ApplicationBeside the production of demineralised water these units are especially suited for the circulation of rinse water.
Specifications
Operating pressure: 2-6 bar. untreated water temperature: max. 35°C, however lower with certain fillings in use. Power connection: 220/12V, 50 Hz. *1°dH corresponds 2,8 mval/l
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Decker Verfahrenstechnik GmbH |