What are the failures and installation methods of reverse osmosis membranes for small industrial EDI pure water treatment equipment?
What are the failures and installation methods of reverse osmosis membranes for small industrial EDI pure water treatment equipment? Author of the article: current EDI small industrial water treatment equipment in the domestic industry is widely used used for medicine, electronics, chemicals, hospitals and other industries, in small industrial EDI water treatment equipment will be used in membrane separation technology, the use of anti The permeable membrane removes charged ions, inorganic matter, colloidal particles, bacteria and organic substances in the water, so that the effluent reaches the water inlet standard of the EDI module. During operation, the reverse osmosis membrane will have some failures, so solve the small industrial EDI pure water treatment What are the common methods for equipment reverse osmosis membrane failure? 1. According to the symptoms, location and daily operation data of reverse osmosis membrane failure, it is preliminarily judged which type of pollution (fouling, fouling, microorganisms, etc.) belongs to; if there is no daily operation To record, it is necessary to conduct water quality analysis and pretreatment effluent control indicators for raw water and concentrated water to help analyze possible causes of failures. 2. Use other methods to further determine the cause of the failure, such as visual inspection, weighing, and on-site dissection of membrane elements. Visual inspection: Open the first section of the water inlet end plate and the second section of the water outlet end plate of the pressure vessel to check the membrane element section and the inner wall of the pressure vessel. If the inner wall feels slippery and smells, there is microbial contamination; if the inner wall feels rough, then There is fouling pollution. Weighing: Weigh the first membrane element of the first stage and the last membrane element of the second stage. If the first membrane element of the first stage is heavier, there may be suspended solids and colloidal pollution; if the last membrane element of the second stage is heavier There may be fouling pollution. On-site dissection of membrane elements: observe and analyze the contaminants on the membrane surface, add acid or alkali on the membrane surface to observe the phenomenon. 3. If the cause of the failure cannot be determined from the above two steps, a membrane element can be taken out of the system for a comprehensive analysis. Each membrane element manufacturer has this service, and the cause of the reverse osmosis membrane failure can be basically determined through a comprehensive analysis. Comprehensive analysis includes visual inspection, weighing, performance testing, dissection, diaphragm contamination analysis, pressure staining, chemical treatment, etc. 4. Through the above analysis, the cause of the reverse osmosis membrane failure can basically be determined, and then a reasonable cleaning plan and corrective measures for the reverse osmosis membrane can be formulated according to the existing problems. Installation steps of reverse osmosis membrane for small industrial EDI pure water treatment equipment: 1. Pay attention to the protection of seals when driving into the end plate, and the lubricating oil should be wiped in place. 2. Check the tightness of the end plate fasteners and whether the bearing plate and supporting umbrella are in place. 3. Check the front and rear parts to avoid missing installation. 4. Make sure that the thrust ring is at the thick water end. 5. Check the connecting pipes to make sure they are installed in place. 6. After all the items are completed, use a high-pressure pump to slowly pressurize the membrane module, and gradually discharge the air in the shell. After emptying, stop the pump to relieve the pressure, and reciprocate several times to make the gasket stretch normally. 7. If there is any leakage, remove it and reassemble it to solve it. High-purity water reverse osmosis equipment 8. There should be no back pressure at the water purification port of the product, and a gate or the like should be left to block the water purification port. This is the introduction of the common methods to solve the failure and installation of the reverse osmosis membrane of small industrial EDI pure water treatment equipment. In the process of use, it is necessary to find out whether the reverse osmosis membrane is malfunctioning in time, so as not to affect the normal use.
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