REVERSE OSMOSIS SYSTEMS RO 809-812-815/E - INSTRUCTIONS MANUAL
s.r.l.Milano - ITALY
Page 22 of 25
ro809-812-815_mi-r0.doc
- r. 0
7.4. Cleaning of the membranes
(see diagram CLEANING OF MEMBRANES)
The operation of membrane cleaning must be performed only by skilled and
authorized operators, using proper tools and CE marked personal protection devices
(gloves, masks, cloths). The operator must be aware of the hazard and danger of
the chemicals used in the process.
It is also required to follow strictly the directions mentioned on the safety bulletins of
the chemicals themselves.
During the normal working, but also during the non-working period, the membranes can be
fouled according to the quality of raw water and the operating conditions; hence a cleaning
operation of the membranes can be required, using proper and suitable detergent (see "Table of
chemicals for cleaning" in the next page).
In these cases, it is suggested to apply the Nobel Service Center closest to you or our
Technical Dept.
The cleaning of the membranes is made by recirculating the detergent chemical through the
membranes.
Proceed as follows :
•
prepare the detergent solution in auxiliary tank; the tank should have a useful volume of at
least 20 liters for each membrane of the system. To dilute the chemical use treated water
(permeate) supplied by the system.
•
switch the working mode selector of the pump P, on the control panel QE, on "0" position
•
close the shut-off valve V1 upstream of the filters
•
turn the 3-ways valves V2 and V3 on
cleaning position (the direction of the flow
towards the fitting R, check the direction
with the symbol marked on the lever of 3-
ways valves)
•
connect temporarily the fitting R to the auxiliary tank, as recirculation connection.
•
open completely the needle valve VS and close the recirculating valve VR.
•
connect the manual valve R1, mounted on the suction line of the pump P, to the auxiliary
tank, suction fitting.
•
start manually the pump P and recirculate the solution in the auxiliary tank for 20-30
minutes; take care that the temperature and pH of the solution will be within the values
mentioned in the table
•
whether possible, recirculate the solution using an external auxiliary pump, with head 3-4
bar at flow of 15-20 m³/h; the external pump will inject directly from the tank into the fitting
R1. Othrwise, use the pump P, the performances of which are by far higher than required
for cleaning operation.
•
whether required, repeat the operation of cleaning, in case, using a different chemical,
after rinsing roughly the membrane with water.
Before to start the service, It is required to remove accurately the residual
detergent inside the membranes, the same way described at chapter
“Starting-up and adjustments”.
CAUTION :
the dumping of the solution used to clean the membranes must be made
according to local laws concerning the waste and environmental protection.
Follow the instructions mentioned on technical bulletin of the chemical
used.
