In the laboratories of the electronics industry, experiments are always conducted to obtain results. This process requires pure water, and the water quality standard of this pure water is very high. Generally, the electronic ultrapure water process system is usually composed of pretreatment, reverse osmosis and ultrapure post-treatment processes. When these three small processes are combined, pure water that meets the corresponding test standards can be produced.

　　①Raw water pretreatment system

　　The pretreatment system is usually made of polypropylene fibers(PP)Filters and activated carbon(AC)Filter composition. For raw water with higher hardness, a softening resin filter also needs to be installed.PPThe filter element can remove substances from the raw water5μmThe above-mentioned mechanical particle impurities, rust and large colloidal substances and other contaminants protect the subsequent filters, which are characterized by a large dirt-holding capacity, Low price.ACThe activated carbon filter core can adsorb residual chlorine and some organic matter and colloids in the raw water, protecting the polyamide reverse osmosis composite membrane from oxidation by residual chlorine. Softening resin can remove most of the calcium and magnesium ions from the raw water, preventing subsequent damageROScale formation and blockage on the membrane surface can enhance the water recovery rate.

　　②Reverse osmosis purification system

　　Reverse osmosis(AbbreviationRO)It is a high-tech membrane separation technology driven by pressure difference, featuring high one-time separation efficiency, no phase change and simplicity. The "pore size" of reverse osmosis membranes has been reduced to nanometers(1nm=10-9m)No "filtering" small holes can be seen on the surface under a scanning electron microscope. Under an operating pressure higher than the osmotic pressure of the raw water, water molecules can pass through reverse osmosisROSemi-permeable membranes produce pure water, while a large number of inorganic ions, organic substances, colloids, microorganisms, pyrogens, etc. in the raw water are absorbedROMembrane retention.

　　It is usually regarded as the electrical conductivity of the raw water<200μS/cmAt that time, level oneROThe conductivity of pure water≤5μs/cmIt complies with the third-level water standard for laboratories. For areas with high raw water conductivity, to save the subsequent cost of replacing mixed-bed ion exchange resins and improve the quality of pure water, customers can consider choosing a two-stage reverse osmosis purification system, two-stageROThe conductivity of pure water is approximately1~5μS/cmIt is related to the quality of the raw water.

　　③Ultra-purification post-treatment system

　　⑴Mixed-bed ion exchange purification column

　　The mixed-bed ion exchange purification column is composed of anion exchange resin and cation exchange resin in a certain proportion. It is used for cation exchange resinH+Anion exchange resins are used to exchange and remove cations from waterOH-The anions removed by exchange in water are exchanged out in the mixed bed resinH+andOH-Combined generationH2OTherefore, mixed-bed ion exchange purification columns can be used for deep removalROThe trace ions remaining in pure water. The mixed-bed ion exchange purification columns in small laboratory ultrapure water machines are usually for single use. The mixed-bed ion exchange purification column adopts original imported nuclear-grade mixed-bed resin, and the resistivity of the produced water can reach18.2MΩ.cm.

　　⑵ediWater system

　　Continuous electro-deionization craterEDIIt is a process in which mixed-bed ion exchange resin adsorbs cations and anions in the feed water, and at the same time, these adsorbed ions pass through the cation and anion exchange membranes respectively under the action of direct current voltage and are continuously removed. This new technology can replace the traditional ion exchange(DI)Output10MΩ.cmThe above ultrapure water.EDIThe major advantage of deep desalination is that it can operate stably for a long time without the need to regenerate anion and cation resins with acid and alkali, making it highly suitable for water production100L/hThe above-mentioned ultrapure water preparation system features stable water quality and will significantly reduce operating costs.TOCIt will also be lower and more stable.ediThe typical resistivity of the produced water in the treatment process system is approximately15~18MΩ.cm.

　　⑶Pyrogenic ultrafiltration membrane

　　Ultrafiltration for pyrogen removal has been widely used in the modern pharmaceutical industry. Ultrafiltration(UltrafiltrationAbbreviationUF")The pore size of the membrane lies between that of reverse osmosis and microfiltration(about0.01～0.1μm)It is usually expressed by the small molecular weight cut-off. The pyrogenic removal ultrafiltration membrane adopts a molecular weight cut-off of5000Dalton's polysulfone membrane can completely remove pyrogens from water(Its small molecular weight is usually greater than7000)And various microorganisms.

　　⑷Ultraviolet lamp

　　Ultraviolet lamp adopts254nmUltraviolet radiation of different wavelengths can effectively destroy microorganismsDNAMolecules, to formTTDimer and unable to reproduce, it is a common and effective method for air and water.

　　⑸Terminal filter

　　Aperture0.22umThe terminal filter can thoroughly filter out spores, resin fragments and all micron-level contaminants. The forms of terminal filters include hollow fiber type.PPBucket filters, bag filters, needle filter devices, etc. The membrane materials include polypropylene, nylon, polyvinylidene fluoride, etc.

　　Beijing Yuanlai Water Treatment Equipment Co., Ltd. offers you: The above conventional process flow is only a basic solution for electronic-grade ultrapure water. If higher water quality is required, the water production process can be appropriately adjusted to meet the water quality requirements