What are the reasons for the rapid decrease of desalination rate of reverse osmosis membrane of medical purified water equipment?

It is an advanced and economical technology to desalinate medical purified water by reverse osmosis membrane In the daily operation of reverse osmosis equipment, it is often found that the desalination rate of medical purified water equipment drops too fast What are the reasons for the rapid decrease of desalination rate of medical purified water equipment? 1 The high pressure difference leads to the rise of pressure drop difference under the desalination rate, which is often accompanied by the rapid decrease of desalination rate Under normal flow rate, the rise of pressure difference is usually caused by impurities, pollutants and scale entering into the diaphragm of membrane element water flow channel, resulting in the decline of water production flow rate When the set feed water flow is exceeded, a large pressure difference will also occur When the feed water pressure is raised too fast during startup, the water hammer pressure difference will be large If the membrane has been polluted, especially the microbial pollution, the pressure difference will also increase The pressure difference between the feed water and the concentrated water indicates the hydraulic resistance, which is related to the flow rate and temperature of the feed water A certain flow rate of the produced water and the concentrated water should be maintained The possibility of high pressure difference is: scale, microbial pollution, scale inhibitor precipitation, filter media leakage, water supply / concentrated water seal damage 2 The unreasonable on-line chemical cleaning of medical purified water equipment is inevitable to be polluted in operation Pretreatment and addition of all kinds of important chemicals can only reduce the possibility of reverse osmosis pollution to a low level, but can not be completely eliminated Therefore, after a long-term operation of RO system, it is necessary to fully demonstrate and confirm which pollutant it is 3 Sodium hypochlorite, as a bactericide, is widely used in the pretreatment of pure water equipment In the reverse osmosis system, in order to prevent the microorganism pollution of reverse osmosis, chlorination treatment should be carried out for the inlet water of reverse osmosis Therefore, it is very important to detect the residual chlorine value of RO water regularly After the reverse osmosis system of medical purified water equipment runs for a period of time, the operating conditions and data of the reverse osmosis equipment should be checked frequently If it is found that the operation of the reverse osmosis medical purified water equipment system has exceeded the operating range, the medical purified water equipment should be maintained in time.