Capacitive Deionization Technology is becoming more and more available and a cost effective alternative to RO also for applications where high production is required.
Like RO Membranes also Plimmer cells are ‘Bricks’ used to compose (build) bigger units.
In ‘Plimmer world’ there are 3 different cell sizes :
- 2.5 l/min – 1 Super Capacitor
- 5.0 l/min – 2 Super Capacitors
- 10.0 l/min – 4 Super Capacitors
As a principle the use of the smaller model is normally suggested for special applications where space is a concern, normally 5.0 or 10.0 l/min cells are the most common building blocks.
In order to obtain continuous water flow often two cells are used as duty/regeneration couple and so actually the “real” building block is made of two equal cells one in operation while the other is in regeneration.
In bigger plants is of course better to use “single”, bigger, pneumatic controlled valves. A typical single pass unit requires 6 pneumatic valves :
Inlet 1, Inlet 2
Outlet 1, Outlet 2
Drain 1, Drain 2
and 2 more valves with a circulation pump for daily maintenance. Size of this valve is (for a “big” 60 cells unit) normally DN25, DN50 and a stainless steel 0.75 kW pump in SS316 is necessary for citric acid recirculation during maintenance.
It is of course possible to control these appliances with a normal PLC but, as it is desirable to collect operative data from the unit, Idropan developed a solution using a Ethernet enabled microprocessor board that can already accept sensors, bridging them to a SCADA Software purposely conceived for the application.
The SCADA Software in a ‘basic’ version can control operation of the full unit taking also care of the daily maintenance period. With some extra pieces of software data collection, graphical representation and other tools can be added.
Each single board can control up to 64 cells couples enabling ‘bigger’ unit to be easily produced.
And can drive up to 16 solenoid valves or contactors where each output can stand up to 2A at 12 VDC (closing to negative common).