Service life of medical ultra pure water machine

First of all, let's understand what is the medical ultra pure water machine system The medical ultra pure water machine system is a multi-functional automatic device composed of pretreatment system, reverse osmosis pure water system, EDI deep desalination system, post-treatment system and circulating water supply system It is a complete set of automatic equipment with safety, convenience, low operation cost and stable water quality The equipment is mainly used for centralized water supply in hemodialysis room, biochemical room, stomatology department, Central Laboratory of supply room, preparation room, operating room, etc The water quality requirements are as follows: Pharmaceutical purified water preparation room purified water, GB6682-92 laboratory water, GB 17323 bottled purified water, Pharmacopoeia 2005 I technical requirements and process flow The medical ultra pure water machine adopts full-automatic control (or manual control), and the automatic backwashing and regeneration procedures can be set when the system is running; the primary and secondary reverse osmosis are equipped with return pipes, and the reverse osmosis equipment is equipped with chemical cleaning devices and disinfection devices; the reverse osmosis membrane is imported from the United States, so as to ensure the long-term and stable operation of the reverse osmosis equipment; the reverse osmosis pipeline Stainless steel, UPVC and other materials are used; online conductivity detector is installed in the level reverse osmosis and the second level reverse osmosis equipment; the reverse osmosis system is equipped with low-pressure protection and high-pressure protection switch; the reverse osmosis water recovery rate is adjustable, and the first level reverse osmosis recovery rate is adjustable 60-70%, the recovery rate of secondary reverse osmosis is 70-80%; the circulation pipeline is equipped with ultraviolet sterilizer and microporous filter to ensure that the pure water meets the health requirements Raw water - raw water booster pump - multi-media filter - activated carbon filter - water softener - precision filter - stage reverse osmosis - pH regulation - intermediate water tank - second stage reverse osmosis (reverse osmosis membrane surface with positive charge) - purified water tank - pure water pump - ultraviolet sterilizer - microporous filter - water point In order to extend the service life of ultra pure water machine, we must start from the technical requirements and technological process This paper analyzes and resolves one by one the raw materials, consumable technology, operation and maintenance which are easy to affect the medical ultra pure water machine equipment 2 Equipment consumables technology the pure water machine adopts reverse osmosis technology for water treatment, so we can not only improve the basic material guarantee of the pipeline, stainless steel and UPVC used in the reverse osmosis equipment, but also conduct the initial purification of the self supplied water in front of the reverse osmosis pure water machine Make it meet the requirements of RO purified water quality, protect RO membrane of RO, make ro operate normally and extend its service life The improvement of pure water treatment can be carried out from the following components (1) the selected melt blown filter element can filter the suspended particles in water larger than 5-10 μ M its pore diameter is not uniform, and the number of pore size is normal distribution, but it shows a large value (peak value) at 5-10 μ M The diameter and pore size of the filaments are related to the temperature of the melt, the temperature and humidity of the indoor air, the size and speed of the air flow, the receiving distance and other factors From the outside to the inside, the pores between the PP fiber filaments of the high-quality melt blown filter element gradually change from big to small, forming a gradual density structure The filtered suspended impurities are not only on the surface of the filter element, but also inside the filter element The filter element has a large amount of pollutants and a long service life But the manufacturing equipment is complex and expensive, and the price of filter element is also expensive (2) although the price of using ceramic filter cartridge is very cheap, it is disposable and can be replaced by ceramic filter cartridge Although the ceramic filter element is expensive and has a large disposable investment, it can be cleaned repeatedly and has a long service life As long as the whole machine is designed to facilitate the installation and disassembly of the filter element, it is a good choice to replace the melt blown filter element with ceramic filter element The ceramic filter element is made of diatomite, which is fired in tunnel kiln It has light hand feel and good water absorption, so the quality of ceramic filter element is good The ceramic filter element with poor quality has relatively rough and uneven surface, more impure impurities in diatomite material and heavy hand feel That's why Another simple method is to put water drop on the surface of ceramic filter element, which should be inhaled quickly without water drop on the ceramic surface, indicating good hydrophilicity and high porosity (3) in some water purifier production enterprises of microfiltration ultrafiltration double membrane process, the mode of hollow fiber microfiltration granular activated carbon hollow fiber ultrafiltration is adopted for the third stage pretreatment, which is also a good combination PVDF hollow microfiltration membrane with reinforced support is used in the second stage to remove suspended matter and bacteria If the membrane is dirty, it can be removed and washed without breaking; the second stage active carbon can remove residual chlorine, organic matter, colloid, peculiar smell, etc.; the third stage PS hollow microfiltration membrane can further remove suspended matter, microorganism, colloid, etc Such careful pretreatment can not only prolong the service life of RO membrane, but also improve the recovery rate of pure water (4) ACF is made of viscose based fiber or polyacrylonitrile based fiber The diameter of ACF is about 10-20 μ m The average pore diameter of ACF is 17-26a, and that of ACF is 10-20A Activated carbon fiber is usually made into felt with thickness of 1-5mm It has more micropores, larger specific surface area (700-1600m2 / g), larger adsorption capacity (2-6 times higher), faster adsorption speed, and good regeneration performance That is to say, it can desorb after adsorption saturation, take out the filter cartridge and treat it with hot water, wash the adsorbed organic matter and colloid down, and the desorption speed is fast It can be reused, that is, the regeneration of filter element But the disadvantage is that the price is more expensive and the production enterprises are less It is also easy to reproduce bacteria in use In addition, the adsorption capacity of some poor quality activated carbon fibers is small, which is easy to saturate soon after use, and it is very troublesome to desorb and regenerate or replace the filter element Therefore, the current use of activated carbon fiber filter is relatively small (5) granular activated carbon filter cartridge activated carbon can remove residual chlorine, adsorb colloid and organic matters, remove peculiar smell and protect reverse osmosis membrane Its performance is mainly reflected in the ability to remove COD The ability of COD removal is related to the design of flow rate and contact time of water purifier According to JB / t2932 "technical conditions of water treatment equipment", remove the residual chlorine in water (the residual chlorine in water is ag2 + > Ag +, control the growth of bacteria and keep the silver ion in water within the standard (6) the purification column is sometimes called super purification column according to the water quality requirements of customers Its function is to desalinate the reverse osmosis pure water in depth, and finally reach the level of first-class water or super pure water Its principle is ion exchange The lifetime of the column is represented by the resistivity on-line Lower than a specific resistance means that the purification column is out of date, which is more intuitive In addition to the water consumption resistance, the life span of the ion exchange resin is especially important for the filling amount of the ion exchange resin and the quality of the ion exchange resin (7) if the water pressure of the decompression pump is too high, the pressure reducing pump may damage the ultrafiltration membrane because the water inlet pressure exceeds 0.3MPa for a long time or the pressure fluctuates greatly; therefore, if necessary, the pressure reducing pump shall be installed to make the water pressure reach the normal working standard of the water purifier III equipment operation, maintenance and use The first is to operate the machine according to the correct process The second is to do a good job in its maintenance to make its working performance more stable The filter elements filtering water quality in the ultra pure water machine are all consumables with a certain service life Therefore, if the consumables are not replaced in time, the whole system will be in poor working condition, and the performance will slowly decline Therefore, in the daily use of the system, it is necessary to strengthen the supervision of the performance indicators of the machine and find out the problems and solve them in time For example, regular ro cleaning of the equipment can discharge the residual pollutants in the equipment and prolong the service life of the water purifier.