Mobile reverse osmosis system
AVRO-flex 400
Order no.
095 752 946-inter Edited by: phar-mrie G:\BA-752946-INTER_095_AVRO-FLEX_400.DOCX
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2 | Functional description
Via a fine filter (filter element), the water is directed to the inlet of the
feed water section. The water flows to the high-pressure pump via the
inlet solenoid valve with a downstream “pressure switch for minimum
pressure”. By means of a control valve, the pressure generated by the
high-pressure pump is reduced to the required operating pressure
and the water is directed to the membrane. The membrane separates
the water into the partial flows permeate and concentrate. A partial
flow of the concentrate is returned to the feed water via an orifice reg-
ulating independently of pressure and thus ensures a steady flow
over the membrane and increases the economic efficiency of the re-
verse osmosis.
At the same time, the concentrate volume flow is run via an AVRO
treatment module where seed crystals are formed at a cathode due to
the application of direct current. These seed crystals are then washed
out with the residual concentrate and thus the reverse osmosis mem-
brane is protected from clogging. Whenever the system is switched
off or in case of disturbances, the substances retained on the mem-
brane are flushed off by means of the inlet solenoid valve and a sole-
noid valve switched in parallel to the control valve for concentrate.
The hydraulic set-up of the system is designed in a way that the con-
centrate volume and the permeate volume are registered by means of
flow sensors and are displayed in the control unit. The system recov-
ery can also be called up in the control unit.
Downstream of the membrane, the permeate produced can be deliv-
ered into the heating system with a counter-pressure of up to 3.5 bar.
Note:
If the counter-pressure on the permeate side increases, the
permeate output decreases.
Filling mode:
If "filling mode" is selected via the selector switch on the controller,
three waves are visible in the controller. The pressure switch is inter-
rogated as the start criterion.
Workshop mode:
If "workshop mode" is selected via the selector switch on the control-
ler, one wave is visible in the controller. Selection of the operating
switch is used as the start criterion. After 24 hours, permeate is pro-
duced over time. The workshop mode prevents germs from infecting
the system, thereby ensuring a constant permeate quality.
