How much do you know about pure water treatment technology?

How much do you know about pure water treatment technology?

Ozone sterilization ultrapure water treatment

Disinfection principle of ozone (O3) Yes: 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 is highly active and has a strong oxidizing effect on bacteria, which will Kill, the excess oxygen atoms will recombine themselves into ordinary oxygen atoms (O2) without any toxic residue, so it is called a non-polluting disinfectant. It not only kills various bacteria (including hepatitis virus, E. coli, green bacilli and miscellaneous bacteria, etc.) has a strong killing ability, and is also very effective against killing mycobacteria.

1. The sterilization mechanism and process of ozone are biochemical processes, which oxidize and decompose the glucose oxidase necessary for oxidizing glucose within 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 bacterial substances. Metabolic production and reproductive processes to destruction.

3. Penetrate the cell membrane tissue, invade the cell membrane, act on the outer membrane lipoprotein and internal lipopolysaccharide, causing cell permeability distortion, leading to cell lysis and death. And the genes, parasitic bacteria, parasitic virus particles, phages, mycoplasmas and pyrogens (bacterial and viral metabolites, endotoxins) in the dead bacteria are dissolved, denatured and destroyed.

Activated carbon adsorption pure water treatment process

Activated carbon relies on adsorption and filtration to mainly remove peculiar colors, odors, and Residual chlorine, residual disinfectants and other organic impurities.

Membrane microporous filtration (MF) pure water treatment process

Membrane microporous filtration method includes three forms: Depth filtration, screen filtration, 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; depth filtration is a more economical method that can It removes more than 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 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. As commonly used PP fiber filter. Surface filtration can remove more than 99.9% of suspended solids, so it can also be used as pretreatment or clarification.

The screen filter membrane basically has a consistent structure, just like a sieve, leaving particles larger than the pore size on the surface (the pore size of this filter membrane is very small) ), such as point-of-use security filters used at the end of ultrapure water machines; mesh filtration and microporous filtration are generally placed at the end-use point in the purification system to remove residual trace amounts of resin flakes, carbon dust, colloids and microorganisms.

Ion exchange (IX) pure water treatment process

The principle of the ion exchange method is to convert the inorganic salts in the water into yin and yang. Ions such as calcium ion Ca2+, magnesium ion Mg2+, sulfate SO42-, nitrate NO3-, etc., are exchanged with the ion exchange resin, so that the anions and cations in the water are exchanged with the anions and cations in the resin, thereby purifying the water.

　Reverse osmosis (RO) pure water treatment process

It uses pressure as the driving force and uses reverse osmosis membranes It is a material separation process that can only pass through water but cannot pass through solutes, and extract pure water from water bodies containing various inorganic substances, organic substances, and microorganisms. The pore size of the reverse osmosis membrane is less than 10 angstroms (1 angstrom is equal to 10-10 meters), and it has a strong screening effect. Its desalination rate is as high as 99%, and its sterilization rate is greater than 99.5%. It can remove inorganic salts, sugars, amino acids, bacteria, viruses and other impurities in water. If the raw water quality and produced water quality are used as the benchmark, after appropriate design, RO is an economical and effective method to purify tap water, and it is also a good pre-treatment method for ultrapure water systems.

Ultrafiltration (UF) pure water treatment process

Microporous membrane is removed according to the size of its filtration pores Particles, while an ultrafiltration (UF) membrane is like a molecular sieve, which uses size as a basis to allow the solution to pass through extremely fine pores to achieve the purpose of separating molecules of different sizes in the solution.

Ultrafiltration membrane is a strong, thin, selective and permeable membrane. It is generally believed that its filtration pore size is about 0.01μm, which can intercept molecules above a certain size, including: colloids , microorganisms and heat sources. Smaller molecules, such as water and ions, can pass through the filter membrane.

Ultraviolet (UV), ozone sterilization ultrapure water treatment process

Using 254nm emitted by ultraviolet lamps /185nm ultraviolet light 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 sandwiched ion exchange resin between anion/cation exchange membranes to form an EDI unit. This method does not require the use of acid and alkali to regenerate the resin, and is environmentally friendly.

　(Original title: How much do you know about pure water treatment technology?)