Selection and maintenance of ultra-pure water machine filters

ultra pure water has been widely used in major laboratories, hospitals, industrial production, the filter is ultra purean important component, should be in the usual course of how to select filters and filter maintain it?1filter size of the filter varies according to the amount of water filteredCommon sand filter, the filter and non-woven PP fiber filterThe length of the non-woven PP fiber filter and the filter 10 inches and 20 inchesIn both cases the diameter, serves as a filter element of the filter should generally be about 25ufunction strainer to remove large particle impurities suspended in the water, to prevent these impurities from entering the activated charcoal filter and covers the surface of the activated carbon loses the capillary structure capable of adsorbing impurities in the watersolid impurities with increasing retention, a sharp increase in the coarse filter, and the flow is gradually reducedIf not promptly treated, the water flow can not meet the requirements of the subsequent processing proceduresFor a sand filter backwashing pressure should be increased to a certain level afterIn the backwash process, some sand from the filter out, and therefore should be regularly added to the sand in the sand filterRepeatedly backwashing, to increase the degree of fragmentation, each backwash not 100% washingThe remaining sand silt gradually increased, sand seems to "tie." In this case, replace the sandFor PP nonwoven fabric or fiber filter cartridge in the filter holes are blocked after washing water is often difficultThe filter must be replaced periodicallya activated carbon filter 2 The main function of the activated carbon filter to remove organic molecules, iron oxide and chlorine Organic, chlorine and iron oxide are easily poisoned ion exchange resins, and cationic surfactants and chlorine will not only poison the resin, but also damage the reverse osmosis membrane and the membrane structure is invalid activated carbon filter using activated carbon rich capillary adsorption and filtration of the organic molecules in water, chlorine, iron oxide, and other colloids This adsorption is irreversible, i.e., the activated carbon has a certain adsorption capacity After the saturated adsorption, the activated carbon loses its adsorption performance can not be inverse to wash Further, after the activated carbon adsorption of organic matter, which provide a rich nutrient for bacteria, so that bacteria in the activated carbon filter, activated carbon filter and by increasing the microbial content of the water backwashing the activated carbon prior to saturated periodically, to remove a large number of bacterial colonies on the surface of activated carbon and suspended solids After the activated carbon adsorption saturation should be immediately replaced with new activated carbon, reverse osmosis or would cause irreparable damage to the membrane 3 softener is a function of the water softener to remove calcium and magnesium from the water and demineralized water ions If there is no water softener or softener failure, due to a sharp increase in the concentration of water-soluble calcium and magnesium salts would precipitate formed in the surface of the reverse osmosis membrane, blocking pores of the membrane and the reverse osmosis shorten for pure water softener usually sodium form cation exchange resin, the resin is exchanged and saturated brine and then regenerated After several years of use, the extent of resin and more serious damage, the gradual loss of the ability to soften Especially when active carbon is saturated and activated carbon filter is not timely replacement, the iron in raw water, organics and residual chlorine directly into the water softener, lead poisoning resin Once the resin poisoning, it can not be regenerated by the regeneration When the operating capacity of the resin is significantly reduced, the resin should be replaced Reverse osmosis is a core component water system Pretreatment and the reverse osmosis membrane has reached the required raw water is reverse osmosis do maintain Reverse osmosis is the key to ensuring clean water quality During operation of the reverse osmosis membrane is higher than the salt concentration in the film surface a large number of salt concentration of the fluid This phenomenon is called concentration polarization Concentration polarization is a result of some salt precipitation