Function introduction of purified water equipment

Introduction to the main functions of purified water equipment:

1. Multiple media filters

Multi-media filter tanks are mostly filled with filters such as quartz sand, anthracite and manganese sand. material. Its main function is to reduce water turbidity and remove a large number of bacteria, viruses, organic matter, etc. in the water. This creates favorable conditions for the subsequent disinfection process. Manganese sand has a significant removal effect on iron and manganese.

2. Activated carbon filter tank

Activated carbon has a large number of micropores and a huge specific surface area, and has extremely strong physical adsorption capacity. It can very effectively absorb impurities in water, especially organic matter and microorganisms. The oxygen-containing catalytic oxidation and chemical adsorption functions formed on the surface of activated carbon can remove part of the metal ions in the water. Activated carbon has a strong adsorption effect on residual chlorine remaining in the water to protect downstream stainless steel equipment and pipeline surfaces and meet the water inlet requirements of subsequent water treatment units.

3. Automatic backflush and regeneration softening tank

The softening tank is filled with sodium-type cation exchange resin. Through the ion exchange reaction of the resin, it reduces the hardness of water and prevents calcium and magnesium ions from combining with carbonate and sulfate ions to cause scaling in subsequent water treatment equipment or pipelines.

4. Precision filter

Precision filter is also called security filter, and the filtration precision is generally 5μm. Its function is to intercept all substances with a particle size greater than 5 μm to meet the water entry requirements of reverse osmosis.

5. Reverse osmosis

The key to the application of reverse osmosis technology lies in the performance of the reverse osmosis membrane that removes salt. A reverse osmosis membrane is a semi-permeable membrane that only allows water molecules to pass through but does not allow solutes to pass through. In addition to applying the principles of reverse osmosis and reverse osmosis, reverse osmosis technology also utilizes the selective adsorption of membranes and the screening mechanism for organic matter. The pore size of reverse osmosis membranes is mostly less than or equal to 10×10-10m, and its separation objects are organic substances in the ionic range and molecular weights of several hundred or so in the solution. It can filter out various bacteria, such as Pseudomonas aeruginosa (3000×10-10m), one of the smallest bacteria, and can also filter out various viruses, such as influenza virus (800×10-10m), meningitis virus (200× 10-10m), and can also filter out pyrogen (10~500×10-10m). This is an issue of great concern for pharmaceutical water.

Due to its simple operation process and high desalination efficiency, reverse osmosis has high pyrogen removal ability when used in pharmaceutical process water, and is also relatively economical, making it the preferred water in pharmaceutical water processes. processing unit. Reverse osmosis technology is not only used in the preparation process of purified water, but also can produce water with the quality of water for injection. The United States Pharmacopoeia has included this method as one of the legal methods for preparing water for injection since the 19th edition. one.

6. Sterilization system

A, oxygen and ultraviolet are combined in an orderly manner for disinfection/sterilization. Ozone is a strong oxidant, and its oxidizing ability ranks second among natural elements only after fluorine. Ozone can oxidize and decompose the glucose oxidase necessary for oxidizing glucose within bacteria. It can also directly interact with bacteria and viruses, destroy cells and ribonucleic acid, and decompose macromolecular polymers such as DNA, RNA, proteins, lipids, and polysaccharides. The material metabolism, growth and reproduction process of bacteria are destroyed. In water treatment, it has significant effects on deodorization, decolorization, sterilization, removal of phenol, cyanide, iron, manganese and reduction of COD and BOD. Ultraviolet light can reduce the formation rate of new colonies in the pretreatment system of the water system. The 254nm ultraviolet lamp located after ozone can be used for disinfection and removal of ozone residues at the same time.

B. Circulation backflow to prevent bacterial growth. The pretreatment system, water production system and water use system in the purified water system are respectively equipped with circulating water channels. When no water is used on holidays or at night; when the purified water tank is full; when the conductivity of the outlet water exceeds the standard, the water in each system is maintained at a certain level. A certain degree of circulation, supplemented by ultraviolet or ozone/ultraviolet sterilization if necessary to prevent bacterial growth.

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