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The ultrapure water unit is used to produce diluate with a typical conductivity of < 0.2 μS/cm by complete desalination of softened water according to the principle of reverse osmosis in combination with electrodeionisation (EDI). It is equipped with a high-quality centrifugal pump with variable-speed drive (VSD = FU). Frequency-controlled operation reduces electricity cost by 30 - 50 %, extends the lifespan of the unit and keeps permeate production constant irrespective of operation pressure. The PLC Siemens S7-1200 enables visualisation of the unit as well as optimal control and evaluation of the unit operation. Optionally, data transfer via interfaces, remote access and subsequent expansion or adaptation of the control system are possible (on request at extra charge).

Benefits

• Very good permeate quality due to combination of RO and EDI (typ. conductivity < 0.2 μS/cm)
• No chemicals required, continuous operation without interruptions
• Convenient and user-friendly PLC S7-1200
• Equipment with VSD (FU) saves 30 - 50 % electricity cost, maintains permeate production constant and enables a longer lifespan as well as particularly quiet operation
• Permeate recycling PR included

Applications

• For continuous diluate supply at high flows
• Ideal for applications with very strict requirements for permeate conductivity (e.g. pharmaceutical, power plant, microelectronics)
• Suitable for reduction of electricity cost

Controller :

PLC Siemens S7-1200

RO desalination rate:

97 %

Resistance diluate without CO2 binding:

5 MΩ x cm

Resistance diluate with CO2 binding:

10 MΩ x cm

Recovery:

70 – 75 %

Diluate backpressure max.:

0.5 bar

pH value operation:

6.5 – 9.5

pH value cleaning:

2.0 - 12.0

Ambient temperature:

5 - 40 °C

Conditions of use:

The unit may only be used for the desalination of softened feed water (< 0,1 °dH) with drinking water quality or appropriately pre-treated well or surface water. The unit is designed for a salinity (TDS) of 1,000 mg/l, a temperature of 15 °C and a CO2 content of 10 mg/l as well as free diluate outflow. Under these conditions, the projected diluate output is achieved even after three years of operation. The diluate quality depends on the raw water quality and the pre-treatment. The following parameters must be maintained in the feed water:

Free chlorine:

not detectable

Iron (Fe):

0.2 mg/l

Manganese (Mn):

0.05 mg/l

Silica (SiO2):

10 mg/l

Silt density index (SDI):

< 3

Feed water temperature:

5 – 35 °C

Feed water pressure:

2 – 6 bar

Pressure fluctuation:

± 0.5 bar

pH value feed water:

5.0 - 9.5