1, softening method

It refers to the removal of water hardness (mainly calcium and magnesium ions in water) or a certain degree of water. In the process of softening, water only softens water quality and does not improve water quality.

2, magnetization method

It refers to the use of magnetic field effect to treat water, which is called magnetization of water. The magnetization process is a process in which magnetization is completed after water passes through the magnet in the direction perpendicular to the magnetic flux. Magnetization treatment of water in China is still in the initial stage of practice and research so far, and foreign water purifiers do not have the requirement of magnetization function, because magnetized water does not belong to the scope of purified water, but it belongs to medical problems.

3, mineralization method

It refers to the addition of mineral elements (such as calcium, zinc, yttrium, etc.) that are beneficial to the human body to the water on the basis of purification. Commercial water purifiers generally achieve the purpose of mineralization by adding maifanite to water purifiers, but the Ministry of Health has stated clearly that “the wading products must not promote any health function”.

4, ozone, ultraviolet sterilization method

All these aspects can only sterilize and remove heavy metals and chemicals that cannot survive the water. The killed corpse remains in the water and becomes pyrogen.

5, RO reverse osmosis method

Home RO reverse osmosis method, which is commonly referred to as water purifier, generally goes through five stages of filtration to achieve the standard of pure water. Such a machine, installed under the cabinet, needs a power supply, and waste water is generated during work. The characteristic is water quality. The standard is high and can be consumed directly.

6, activated carbon adsorption

It can be divided into the following three forms: 1 Particulate granular activated carbon is more commonly used, multi-purpose nature, coal, nutshell (core) and other carbon-containing substances are made by chemical method or physical activation method. It has a very large number of micropores and specific surface area, and therefore has a strong adsorption capacity, can effectively adsorb organic pollutants in water. In addition, during the activation process, the amorphous part of the activated carbon surface forms some oxygen-containing functional groups. These groups enable the activated carbon to have chemical adsorption, catalytic oxidation, and reduction properties, and can effectively remove some of the metal ions in the water.

Infiltrated activated carbon combines activated carbon and silver to not only adsorb organic contaminants in water, but also has bactericidal action, and it does not grow bacteria in activated carbon, and solves the problem that water purifier effluent sometimes has high nitrite content. problem. When the water passes through the silver-carried activated carbon, the silver ions will be slowly released to play a role in sterilization and sterilization. Since the activated carbon has a good effect of removing color, odor, chlorine, iron, arsenic, mercury, cyanide, phenol, etc. in the water, the sterilization effect is 90% or more, and thus it is applied to a small water purifier.

A new type of adsorbent material formed after activation treatment of activated carbon fiber organic carbon fiber has a well-developed microporous structure, a large specific surface area, and a large number of functional groups. Foreign countries have made remarkable achievements in the use of fiber-activated carbon for solvent recovery, gas purification, etc., and have also done a lot of research work in water treatment applications.

7, microfiltration and ultrafiltration

Ultrafiltration machine

The microfiltration method is a microporous membrane made of cellulose or a polymer material, and uses its uniform pore size to retain particles, bacteria, colloids, etc. in the water and remove it without passing through the membrane. This microporous membrane filtration technology, also known as particle-dense filtration technology, can filter micro- or nano-scale particles and bacteria. Both ultrafiltration and microfiltration are membrane separation technologies. There is no obvious boundary between the two. The working pressure of ultrafiltration is generally about 0.3 MPa, which can remove macromolecules, bacteria, viruses, etc., but the flux is low. .

8, composite filter

When a process is difficult to remove harmful substances in water, the use of two or more processes is compounded. Such as activated carbon adsorption? Ultraviolet sterilization, activated carbon adsorption? Reverse osmosis, activated carbon adsorption? Microfiltration (ultrafiltration), polypropylene microfibers? Live charcoal? Microfiltration (ultrafiltration) etc. In the compound type water purifier, the membrane technology has a good performance in the purification of the water purifier, especially in the removal of microorganisms (bacteria, algae, etc.), and some of the excellent water purifiers can directly drink raw water. Has been welcomed by the majority of consumers, has become a hot spot for the development of water purifiers.

From the above classification of water purifiers, it is not difficult to see that household water purifiers are essentially miniaturization of advanced treatment of water supply, and their main treatment targets are turbidity, color, smell, and organic matter in tap water. It is generally composed of three parts: pre-filtration (coarse filtration), adsorption, fine filtration (microfiltration, ultrafiltration, reverse osmosis). Adsorption (usually using activated carbon adsorption) and fine filtration are the main means to remove organic matter, odor and color in water, and the objective operating conditions directly affect the water quality of the water purifier. Domestic water purifiers serve thousands of households, but due to the quality of the water used in the area, the water pressure conditions are very different, and users lack the necessary operating knowledge, and the current product design cannot cope with the ever-changing situation. Therefore, water purifiers The manufacturer should consider allowing the user to master certain professional knowledge, standardize the installation and operation of the water purifier, so that the effluent water quality achieves the desired effect, allowing the user to rest assured.