HygroMatik WL-ROL 160-1200 Series, Руководство пользователя

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Page 12
4.3 Operating conditions of the
unit
In order to ensure the high production capa-
city, the WL-ROL unit should only be fed with
drinking water that has previously been pre-
treated by a softening plant or an anti-cal-
cant.
In order to avoid a reduction of the operating
capacity, the water to be treated must comply
with certain parameters:
turbidity < 1 NTU
Iron < 0,15 ppm
SDI (Silt Density Index) < 3
Water temperature 5 to 25 °C
Free chlorine < 0,2 ppm
Hardness < 28 °dH(30 °F)
COD < 10 mg/l
TOC < 3 mg/l
TDS < 750 ppm
SiO2 < 15 ppm
conductivity < 1000 ppm
Ensure that the water is pre-treated by using
a softener or an antiscalant.
4.3.1 Recovery value
You can optimise the permeate production by
adjusting the flow rates (Ref. 1). The basis for
this is the respective recovery value of the
plant (see technical data). If the recovery
value is 68%, this means a permeate produc-
tion quantity of 68% of the feed water used
for this purpose. The difference to 100%
shows the concentrate share.
You can optimise permeate output by adju-
sting the flow rates (Ref. 1). The basis for this
is the relevant recovery value of the system
(see technical data). For example, the
recovery value for the ROL320 is 68% at a
raw water temperature of 18 °C and a TDS
value of 500 ppm.
The recovery value is calculated as follows:
RECOVERY (%) = Permeat* 100
Regulate the flow rate of the concentrate
through the BV03* valve and read it off the
FI03* flow meter. The circulation is controlled
by the BV02* valve and read off at the FI02*
flow meter. The pressure regulated in this
way on the membranes guarantees the spe-
cified production output.
The feed water temperature clearly influen-
ces both productivity and the quality of the
permeate. If the temperature rises (even by
only a few degrees), productivity increases
(which results in a better recovery value);
however, conductivity increases at the same
time.
* see chapter: Commissioning
Ref.1
A Permeat flow meter
B Recirculation flow meter
C Manual recirculation control valve
D Permeat conductavity probe
E Attachement for sampling permeat
F Flushing solenoid valve
G Manual flushing control valve
H Manual drain control valve
I Drain flow meter
(P Concentrate