RO digital controller

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The permeate-staged reverse osmosis is used for the desalination of softened water with a salinity of up to 1,000 mg/l. Due to the double-stage design, a permeate conductivity of approx. 5 µS/cm is typically reached. The unit is equipped with one high-quality centrifugal pump with variable-speed drive (VSD = FU) for each stage. 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 RO digital microprocessor controller (one controller per stage) enables fully automatic operation with logging of all relevant operating data and freely adjustable limit values. The unit can be connected to the central control system via an optional Profinet interface.

Benefits

• Conductivity permeate < 5 µS/cm
• Flexible installation in confined spaces
• Subsequent upgrade from standard to permeate-staged unit easy to carry out
• Equipment with VSD (FU) saves 30 - 50 % electricity cost, maintains permeate production constant and enables a longer lifespan as well as particularly quiet operation
• Versatile RO digital controller with logging of operation data and many parametrisation options

Applications

• Desalination of softened water
• Ideal for applications with strict requirements on permeate conductivity (e.g. in surface technology, chemical industry, laboratory technology etc.)

Controller :

RO digital

Desalination rate min.:

99.5 %

Permeate recovery stage 1:

75 - 80 %

Permeate recovery stage 2:

85 %

Permeate back pressure max.:

0.3 bar

pH value operation:

6.5 – 9.5

pH value cleaning:

2 – 12

Ambient temperature:

5 – 40 °C

Conditions of use:

The unit may only be used for the desalination of softened feed water 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 and a temperature of 15 °C. Under these conditions, the projected permeate output is achieved even after three years of operation. The permeate yield 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):

< 25 mg/l

Silt density index (SDI):

< 3

Feed water temperature:

5 – 35 °C

Feed water pressure:

2 – 6 bar

Pressure fluctuation:

± 0.5 bar