How to preserve the original reverse osmosis film in reverse osmosis pure water equipment

the preservation method of the original reverse osmosis membrane, Volan Water Treatment Equipment Co., Ltdexplained in detail:(1) membrane elements have been tested through water before leaving the factory, and 1% of sodium sulphate solution for storage treatment, and then with oxygen isolation bag vacuum packaging; Even if it is necessary to temporarily open in order to confirm the quantity of the same package, it must be carried out without damage to the plastic bag, which should be saved until the time of use; Choose a well-ventilated place when saving in an environment with a temperature of more than 10 degrees C,and avoid direct sunlight, save temperature not more than 35 degrees C,(4) membrane elements will be physically damaged if frozen, so to take insulation measures, do not freeze it; More than 35 degrees C, and to avoid direct sunlight,(2) temperature below 0 degrees C will have the risk of freezing, so to take anti-freezing measures,(3) in order to prevent membrane elements in short-term storage, transportation and system standby when the growth of microorganisms, need to use pure water or reverse osmosis production water preparation concentration of 500 to 1,000 ppm, pH3 to 6 sodium sulfate (food grade) protectionTypically, with Na2S2O5, it reacts with water to produce sulphates,(4) soakthe the membrane element in a preservation solution for about 1 hour, remove the membrane element from the solution, and pack it in an oxygen isolation bag, seal the bag and label it to indicate the date of the package;(5) needs to be preserved After the membrane element is repackaged, the preservation conditions are consistent with the new membrane element, the concentration and pH of the(6) preservation fluid should be kept in the above range, and should be checked regularly, and if deviation may occur, the preservation fluid should be modulated again, and(7) the film cannot be dried in any case when it is preserved(8) can also be used at a concentration (mass percentage concentration) of 0.2 to 0.3% formaldehyde solution as a preservation solutionFormaldehyde is a stronger microbial killer of biasulphate and contains no oxygen in its ingredients reverse osmosis system shutdown maintenance to consider the following things: (1) after shutting down, using the treated reverse osmosis supply water, softening water or product water flushing system ; Therefore, before preservation to carry out chemical cleaning, so that the membrane elementcan remove dirt, the growth limit of bacteria, (5) in the pressure vessel when the allowed temperature and pH range as follows: temperature range: 0 to 35 degrees C, pH range: 3-7, (6) preservation solution using acidic sodium sulphate (SBS) solution The water in which the deposit solution is formulated must ensure that it does not contain residual free chlorine or other oxidants short-term preservation (less than 48 hours): if the reverse osmosis system is longer than two days of downtime, the following measures are taken to save the system: (1) flush the system with RO water while draining the air from the system, and (2) close the inlet and thick water valves when the pressure vessel is filled with water repeat these steps every twelve hours long-term preservation (greater than 48 hours): if the downtime of the reverse osmosis equipment is greater than 48 hours, the following procedure can be used for systematic preservation: (1) the system needs to be cleaned before all preservation, removing all contaminants and dirt deposited on the membrane surface (this operation is only used if the membrane element is contaminated or is expected to be contaminated) Use the recommended standard cleaning and disinfection procedures before a long-term system shutdown After successful cleaning and disinfection, save as quickly as possible, at a time of 12 hours for cleaning/sterilizing (2) preservation is done by using a circulation of 500-1,000 ppm sodium sulphate solution In this way, the membrane element sits thoroughly wet in the preservation solution By circulating the solution throughout the system in this way, the remaining air volume can be reduced to the available after the completion of the secondary cycle (approximately 1 hour) Make sure that the system does not contain air for sealing during preservation and that the air tightness is good (3) close all valves at the supply and salt water ends Any contact with sodium sulphate solution with the outside air (oxygen) will result in sodium sulphate being oxidized into sulfates, and pH will continue to decline After all sulphates are consumed, the remaining oxygen will not be absorbed, and the state of the organism will become unstable (4) the pH of the saved reverse osmosis system needs to be adjusted regularly (at least once a month) to ensure that the pH of the solution is not lower than 3 If the pH of the saved solution is found to be less than 3, the preservation solution must be replaced The preservation solution must be replaced once a month (5) Do not store at temperatures above 35 degrees C during shutdown, but not below 0 degrees C to prevent freezing (6) can also be used as a preservation solution of sodium sulphate with a formaldehyde solution with a mass percentage concentration of 0.2-0.3% Formaldehyde is a stronger microbial killer of biasulphate and does not contain oxygen in its composition Note: Because formaldehyde has a certain toxicity, so when using formaldehyde, we must pay attention to the safety provisions of formaldehyde use;