Demineralization plant, VE-system
A demineralization system, VE-system, is used to produce so-calledVE-water (demineralized water). In this process, all ionogenic substances (usually salts and dissolved gases such as carbon dioxide) are removed from the incoming water, usually city water, via an ion exchanger and replaced with H2O. This produces highly pure demineralized water (also known as DM water or “forklift water” or “battery water”) for industrial purposes.
High-purity water is often required in industrial processes, e.g. in industrial rinsing and cleaning processes or when filling forklift truck batteries. The typical parameters of the existing water, city water “from the tap” or well water, are generally not sufficient, as particularly limescale deposits of the hardness formers calcium and magnesium are disturbing in the processes. The demineralization system, VE-system, removes cationic ions such as sodium, calcium, magnesium and also copper (drinking water regulations allow up to 2.0 mg/L) via the cation exchanger and anionic ions such as corrosive chlorides or sulphate via the anion exchanger. Within the scope of their available capacities, the strongly acidic cation exchanger releases H+ ions in exchange and the strongly basic anion exchanger releases OH- ions in exchange. A weakly basic anion exchanger, on the other hand, binds the proton and an equivalent amount of anions. Together, H20 is produced in the outlet of the system instead of the input ion loads. By removing the ionic substances, this ensures a low conductivity value of typically < 3-5 µS/cm at the outlet of the demineralization system resp. VE-system so that the demineralized water can be used for most industrial processes. Additional filter stages are required for the separation of any organic matter or other apolar substances present in well water, or for a further reduction of the conductance value.
Products
A demineralization system or VE-system has an automatic regeneration station on site. For smaller quantities, a demineralization cartridge is available, for example, which does not require wastewater to be produced on site, as it is treated centrally in the regeneration station in 92348 Berg via the ion exchanger regeneration service.
The resins used in the system in the various columns are regenerated with acid and alkali, usually with hydrochloric acid and caustic soda. The regenerates from the plant are then treated in the company’s own chemical and physical wastewater treatment system. Please note that the system is subject to approval under water legislation in accordance with Annex 31 of the Wastewater Ordinance if more than 10 m³/week of wastewater is produced.
Customer-specific adaptation of demineralization system / VE-system:
- Customer-specific design to suit the process (city water/well water ingredients) and the budget, starting from a semi-automated, functional simplex basic design through to an automated and remotely monitored duplex design.
- Adaptation to any existing control technology and connection to a process control system and the existing structural conditions at the site or the entry to the site
- Fulfillment of customer requirements for industrial processes
- Siemens PLC circuit with/without touch display and with the option of external access
- Duplex version for uninterrupted 24/7 operation optional
- Stainless steel or plastic frame construction for corrosive environments
- Pressure tanks in PE/GfK or coated steel
- Ion exchange resin from LANXESS Lewatit or Purolite or according to customer requirements
- Piping and fittings in PVC or PP from the manufacturers GF, GEMÜ (pneumatic or electrical) or according to customer requirements; otherwise design with standard industrial components without special elements where possible.
- Single valve control, combination head control optionally possible
- Internal recirculation to avoid counterion re-dissolution effects
- System design for operation in compliance with occupational safety requirements, even in the event of typical misuse
- Disinfection option for the resin bed
- Possibility of pre-acceptance and trial operation in our own workshop
- Modular, maintenance-friendly design according to customer requirements with various optional expansion options, e.g. with storage tanks, chemical storage tanks as dosing stations or as AwSV LAU systems, drip pans, simple feeding to redundant FU duplex pressure booster stations, pressure difference display, actual consumption and production data recording, separate resin changeover connections, system access control, valve position feedback, separate silica cleaning.
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