Nobel RO 809 /E Instruction Manual
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Contents
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REVERSE OSMOSIS SYSTEMS RO 809-812-815/E - INSTRUCTIONS MANUALs.r.l.Milano - ITALY Page 22 of 25 ro809-812-815_mi-r0.doc - r. 07.4. Cleaning of the membranes (see diagram CLEANING OF MEMBRANES)The operation of membrane cleaning must be performed only by skilled andauthorized operators, using proper tools and CE marked personal protection devices(gloves, masks, cloths). The operator must be aware of the hazard and danger ofthe chemicals used in the process.It is also required to follow strictly the directions mentioned on the safety bulletins ofthe chemicals themselves.During the normal working, but also during the non-working period, the membranes can befouled according to the quality of raw water and the operating conditions; hence a cleaningoperation of the membranes can be required, using proper and suitable detergent (see "Table ofchemicals for cleaning" in the next page).In these cases, it is suggested to apply the Nobel Service Center closest to you or ourTechnical Dept.The cleaning of the membranes is made by recirculating the detergent chemical through themembranes.Proceed as follows :• prepare the detergent solution in auxiliary tank; the tank should have a useful volume of atleast 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 oncleaning position (the direction of the flowtowards the fitting R, check the directionwith 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 auxiliarytank, suction fitting.• start manually the pump P and recirculate the solution in the auxiliary tank for 20-30minutes; take care that the temperature and pH of the solution will be within the valuesmentioned in the table• whether possible, recirculate the solution using an external auxiliary pump, with head 3-4bar at flow of 15-20 m³/h; the external pump will inject directly from the tank into the fittingR1. Othrwise, use the pump P, the performances of which are by far higher than requiredfor 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 residualdetergent 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 madeaccording to local laws concerning the waste and environmental protection.Follow the instructions mentioned on technical bulletin of the chemicalused. |
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