Pure water treatment process - how many do you know? - Water purification related - Pure water treatment

Pure water means that pure water generally uses urban tap water as the water source. Through multi-layer filtration, harmful substances such as microorganisms can be removed, but at the same time, minerals required by the human body such as fluorine, potassium, calcium, and magnesium are removed. The disinfection principle of ozone (O3) for ultrapure water treatment by ozone sterilization is: the molecular structure of ozone is unstable at normal temperature and pressure, and it quickly decomposes into oxygen (O2) and a single oxygen atom (O); the latter has a strong It has a strong oxidizing effect on bacteria and kills them, and the excess oxygen atoms will recombine into ordinary oxygen atoms (O2) by themselves, and there is no toxic residue, so it is called a non-polluting disinfectant. It has strong killing ability to various bacteria (including hepatitis virus, Escherichia coli, Pseudomonas aeruginosa and miscellaneous bacteria, etc.), and it is also very effective for killing mycin. 1. The sterilization mechanism and process of ozone belong to the biochemical process, which oxidizes and decomposes the glucose oxidase necessary for the oxidation of glucose inside the bacteria. 2. Directly interact with bacteria and viruses, destroy their organelles and ribonucleic acid, decompose macromolecular polymers such as DNA, RNA, proteins, lipids and polysaccharides, and destroy the metabolic production and reproduction process of bacteria. 3. Penetrates the cell membrane tissue, invades the cell membrane and acts on the outer membrane lipoprotein and the internal lipopolysaccharide, causing the cells to permeate and distort, resulting in cell lysis and death. And the genetic genes, parasitic strains, parasitic virus particles, bacteriophages, mycoplasmas and pyrogens (bacterial and viral metabolites, endotoxins) in the dead bacteria will be dissolved and denatured. Activated carbon adsorption pure water treatment process Activated carbon mainly removes organic impurities such as heterochromatic color, peculiar smell, residual chlorine and residual disinfectant in water by adsorption and filtration. Membrane microfiltration (MF) pure water treatment process Membrane microfiltration includes three forms: depth filtration, screen filtration, and surface filtration. Depth filtration is a matrix made of woven fibers or compressed materials, and uses inert adsorption or capture to retain particles, such as commonly used multi-media filtration or sand filtration; depth filtration is a relatively economical way to remove 98 % or more of suspended solids, while protecting the downstream purification unit from being blocked, so it is usually used as a pretreatment. Surface filtration is a multi-layer structure. When the solution passes through the filter membrane, particles larger than the pores inside the filter membrane will be left behind and mainly accumulate on the surface of the filter membrane, such as the commonly used PP fiber filtration. Surface filtration can remove more than 99.9% of suspended solids, so it can also be used as pretreatment or clarification. The sieve filter membrane basically has a consistent structure, just like a sieve, leaving particles larger than the pore size on the surface (the pore measurement of this filter membrane is very accurate), such as the terminal used in ultrapure water machines Use point security filters; mesh filtration Microfiltration is generally placed at the end-use point in the purification system to remove the last remaining traces of resin flakes, carbon chips, colloids and microorganisms. Ion exchange (IX) pure water treatment process The principle of ion exchange method is to exchange inorganic salt anions and cations in water such as calcium ion Ca2+, magnesium ion Mg2+, sulfate SO42-, nitrate NO3-, etc. The anions and cations in the water are exchanged with the anions and cations in the resin, so that the water is purified. The reverse osmosis (RO) pure water treatment process is based on pressure as the driving force, and uses the selectivity of the reverse osmosis membrane to only permeate water but not solutes to extract pure water from water bodies containing various inorganic, organic and microorganisms. material separation process. The pore size of the reverse osmosis membrane is less than 10 angstroms (1 angstrom equals 10-10 meters), and it has a strong screening effect. Its desalination rate is as high as 99%, and the sterilization rate is greater than 99.5%. It can remove impurities such as inorganic salts, sugars, amino acids, bacteria and viruses in water. Based on the quality of raw water and produced water, RO is the most economical and effective way to purify tap water after proper design, and it is also the best pre-treatment method for ultrapure water systems. The ultrafiltration (UF) pure water treatment process microporous membrane removes particles according to the size of its filtration pore size, while the ultrafiltration (UF) membrane is like a molecular sieve. To achieve the purpose of separating molecules of different sizes in solution. Ultrafiltration membrane is a kind of strong, thin and selective permeable membrane, which is generally considered to have a filtration pore size of about 0.01 μm, which can retain molecules above a certain size, including: colloids, microorganisms and heat sources. Smaller molecules, such as water and ions, pass through the membrane. Ultraviolet (UV) and ozone sterilization ultra-pure water treatment process uses 254nm/185nm ultraviolet rays emitted by ultraviolet lamps, which can effectively kill bacteria and degrade organic matter. EDI pure water treatment process is a new deionized water treatment method. Also known as continuous electric desalination technology, the EDI device fills and sandwiches ion exchange resin between anion/cation exchange membranes to form an EDI unit. This method does not need to regenerate the resin with acid and alkali, and has good environmental protection.