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About pure water treatment process | What do you know?
分類：Common Problem 時間：2020-12-07 09:39:55
Pure water refers to pure water, which 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, it also removes fluorine, potassium, calcium, magnesium and other minerals required by the human body.
Ozone sterilization ultrapure water treatment
The disinfection principle of ozone (O3) is: the molecular structure of ozone is unstable under normal temperature and pressure, and it will quickly decompose into oxygen (O2) and a single oxygen atom (O); the latter has strong activity and is extremely resistant to bacteria. Strong oxidation will kill it, and the excess oxygen atoms will recombine themselves into ordinary oxygen atoms (O2). There are no toxic residues, so it is called a pollution-free disinfectant. It is not only harmful to various bacteria (including hepatitis). Viruses, Escherichia coli, Pseudomonas aeruginosa and other bacteria, etc.) have strong killing ability, and it is also very effective for killing mycin.
1. The sterilization mechanism and process of ozone belong to the biochemical process. Oxidation 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 DNA, RNA, proteins, lipids and polysaccharides and other macromolecular polymers, so that the bacteria's material metabolism, production and reproduction process will be destroyed.
3. Infiltrate the cell membrane tissue, invade the cell membrane and act on the outer membrane lipoproteins and internal lipopolysaccharides, causing the cells to undergo permeation distortion, leading to cell lysis and death. In addition, the genetic genes, parasitic species, parasitic virus particles, bacteriophages, mycoplasma and pyrogens (bacterial virus metabolites, endotoxins) in the dead bacteria are dissolved, denatured and killed.
Activated carbon adsorption pure water treatment process
Activated carbon relies on adsorption and filtration to remove organic impurities such as color, odor, residual chlorine, and residual disinfectant in the water.
Membrane microporous filtration (MF) pure water treatment process
Membrane microporous filtration includes three forms: depth filtration, mesh filtration, and surface filtration.
Depth filtration is a matrix made of woven fibers or compressed materials, which uses inert adsorption or capture methods to retain particles, such as commonly used multi-media filtration or sand filtration; deep filtration is a more economical method that can remove 98 % Of suspended solids, while protecting the downstream purification unit from being blocked, so it is usually used as a pretreatment.
Surface filtration is a multilayer structure. When the solution passes through the filter membrane, particles larger than the internal pores of the filter membrane will be left behind and mainly accumulated 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 for pretreatment or clarification.
The mesh filter membrane basically has a uniform 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 ultrapure water machine terminal use Use point-of-care filters; mesh filtration and microporous filtration are generally placed at the final point of use 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 the ion exchange method is to exchange the inorganic salt anions and cations in water, such as calcium ion Ca2+, magnesium ion Mg2+, sulfate SO42-, nitrate NO3-, etc. Anion and cation exchange, so that the water is purified.
Reverse osmosis (RO) pure water treatment process
It uses pressure as the driving force and uses the selectivity of reverse osmosis membranes to only permeate water but not solutes to extract pure water from a water body containing various inorganic, organic, and microorganisms. The reverse osmosis membrane has a pore size of less than 10 angstroms (1 angstrom is equal to 10-10 meters), and has a strong screening effect. Its salt rejection 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 the water. If based on the quality of raw water and produced water, after proper design, RO is the most economical and effective method for purifying tap water, and it is also the best pretreatment method for ultrapure water systems.
Ultrafiltration (UF) pure water treatment process
The microporous membrane removes particles according to the size of its filter pore size, while the ultrafiltration (UF) membrane is like a molecular sieve, which is based on the size, allowing the solution to pass through very fine pores to achieve the purpose of separating molecules of different sizes in the solution. .
Ultrafiltration membrane is a strong, thin, and selective permeable membrane. It is generally considered that its filtration pore size is about 0.01μm, which can retain molecules above a certain size, including: colloids, microorganisms and heat sources. Smaller molecules, such as water and ions, can pass through the membrane.
Ultra-pure water treatment process with ultraviolet (UV) and ozone sterilization
The 254nm/185nm ultraviolet rays emitted by the ultraviolet lamp can effectively kill bacteria and degrade organic matter.
EDI pure water treatment process
A new deionized water treatment method. Also known as continuous electric desalination technology, the EDI device fills the ion exchange resin between the anion/cation exchange membranes to form an EDI unit. This method does not need to regenerate the resin with acid and alkali, and is environmentally friendly.
