UK
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11. FUNCTIONAL
DESCRIPTION
The water is pressed through the
RO membrane by means of a
high-pressure pump. The per-
meate (desalinated water) is
then led to consumption and can
e.g. be collected in a reservoir.
The concentrate (the water con-
taining the concentrated salts) is
led to outlet. The relation be-
tween permeate/ concentrate
shall be adjusted manually on
the needle valve.
Under normal operating condi-
tions the RO membranes have a
long lifetime. But even with a
good raw-water quality, layers
of impurities will, to a certain
extent, occur and there will be a
slow reduction of the permeate
capacity.
12. CLEANING/ RE-
PLACEMENT OF
MEMBRANES
Read through the entire section
12 before cleaning/ replace-
ment of membranes are started.
12.1 Cleaning proce-
dure
Cleaning cannot be carried out
until following has been done:
Empty out approx. 25 litres
treated water from the reservoir
tank. Disconnect the power sup-
ply of the plant. Shut off the
raw-water supply.
Disassemble the raw-water hose
in opposite end of the pre-filter
(M-Figure 3).
Take out the filter cartridge lo-
cated in the pre-filter housing
(M-Figure 3). Fill the filter hous-
ing with raw water before reas-
sembling it.
Open outlet valve (B-Figure 3)
complete and close the recircu-
lation valve (D-Figure 3).
Lead the permeate hose (A-
Figure 3) away from the reser-
voir tank and insert it into the
bucket containing cleaning
agent.
Take a plastic bucket, minimum
25 litres, or order a special CIP
tank for the BWT PERMAQ
®
Compact 51 from BWT and fill
in 25 litres of warm raw water
40°C.
Place the bucket on a level a bit
higher than the pre-filter (M-
Figure 3)
Put the raw-water connection
hose into the bucket.
Short-circuit the wires on the
safety pressure switch fitted on
the pre-filter housing (M-Figure
3) by leading the 2 together or
jump the terminals 1 and 4. Di-
rect outlet hose (C-Figure 2) to
the bucket with the heated wa-
ter.
Now start the plant by re-
connecting the power.
To begin with the plant will
make a little “noise” until the
warm water has run into the
plant.
Then operate the plant in this
way for 20-30 min. until the
plant components (mem-
branes/pumps) are heated to
approx. 40°C. Replace the wa-
ter in the bucket continuously to
keep the water temperature at
40°C during the heating period.
When the plant components
have reached 40 °C, the plant
shall be stopped by disconnect-
ing the power.
Refill the bucket with 40 °C
warm water. We recommend
using treated water for this pur-
pose.
Mix in citric acid in the ratio 2%
for 25 litres water. That means
½ kg citric acid for 25 litres of
water.
Restart the plant by connecting
power again.
Operate the plant for 5 minutes
with this solution of citric acid.
Then stop the plant for 5
minutes.
Run the plant again for 5
minutes.
This procedure shall be repeat-
ed 3 times, i.e. 3 times 5
minutes with a break between
every operating period.
If the membranes are very
blocked due to too late clean-
ing, it is recommended to clean
the membranes all over from the
beginning with a new solution
of citric acid. This extra cleaning
should not be necessary, if the
capacity has only dropped by
10 %.
When the cleaning procedure is
finished, the cleaning fluid must
be disposed of in a sensible
way, and the raw-water hose
(A-Figure 2) shall be connected
to the raw-water again.
The outlet hose (C-Figure 2)
shall be led back again to the
drain.
Refit (possibly new) 5”-5µ filter
cartridge in the pre-filter hous-
ing (M-Figure 3) and reconnect
the wire to the pressure switch
on the pre-filter.
Start the plant again and flush
for 20-30 minutes.
When the plant has been thor-
oughly flushed, adjust outlet/
recirculation valve (B-Figure 3)
again. (see section: Start-up of
plant).
When the plant operating pres-
sure, which can be read on ma-
nometer (E-Figure 3), has
reached 13.5-14.5 bar, check
the permeate hose (A-Figure 3)
to make sure the water quality is
<20 µS/cm (conductivity meter
is available as aux. equipment).
If the water quality is >20
µS/cm, the plant must run for
10-20 min. before new check-
up can be carried out.
Check if the plant capacity, as
read on flow meter (F-Figure 3),
is satisfactory.
When the capacity and water
quality has been found satisfac-
tory, lead the permeate hose (A-
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