Beverage Machinery Water Treatment Equipment ( 3 )

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10.22

(4) ultrafilter


Although ultrafiltration technology started relatively late in our country, it has developed very rapidly. With the continuous promotion of this technology and the continuous improvement of people's understanding of it, the beverage production industry will definitely get more benefits from it.


Ultrafiltration membrane equipment has several different forms such as flat plate, tubular, spiral plate and hollow fiber in industrial applications. At present, most of the domestic applications are plate and tubular, especially hollow fiber membranes (hollow fiber membranes) have also been widely used in water treatment.


Hollow fiber ultrafiltration membrane is a relatively mature and advanced form of ultrafiltration technology. This kind of membrane is a thin film with a three-dimensional geometry developed on the basis of a flat membrane, so that the membrane device per unit volume has a large membrane permeability without relying on a thin semi-permeable membrane. The hollow fiber tube wall is covered with micropores, and the pore size is expressed by the relative molecular mass of the intercepted substance, and the intercepted relative molecular mass can reach several thousand to hundreds of thousands. Due to the adoption of the hollow cylindrical configuration, the production capacity of the membrane permeation equipment per unit volume is greatly improved. Raw water flows under pressure on the outside or inside of the hollow fiber, forming an external pressure type and an internal pressure type respectively. Ultrafiltration is a dynamic filtration process, and the intercepted substances can be eliminated according to the concentration, without clogging the membrane surface, and can be operated continuously for a long time. It can be proved that in ultrafiltration applications, if a cylindrical bundle of hollow fiber membranes with a reasonable size and small diameter is used, the amount of permeate produced will be equivalent to that obtained on an ultra-thin flat membrane of more than ten square meters.


The hollow fiber is a slender membrane tube, the inner wall is a membrane layer, the membrane layer is combined on the sponge-like outer wall, the outer wall has coarse holes, and the inner layer acts as an ultrafiltration separation. The size of the inner membrane pores determines the size of the blocked material in the tube. The hollow fiber has an inner diameter of about 200 μm, is made of an inert non-ionic polymer, has a unique anisotropic (skin) structure, and has a significantly high flow rate. Its characteristics are: ①The membrane area per unit volume in the device is large; ②The membrane wall is thin, and the liquid permeation speed is fast; ③The geometric configuration of the hollow fiber has a certain pressure resistance, so the strength is high.


3. Water sterilization and disinfection equipment

(1) Ozone sterilizer 

The so-called ozone sterilizer uses the strong oxidation of ozone to achieve the purpose of sterilization. Ozone is a strong oxidant, its bactericidal effect is 15∽30 times higher than that of chlorine, and it acts for 5∽10min at a certain concentration, and ozone can achieve the degree of sterilization for various fungi. It has been widely used in water disinfection treatment in foreign countries to deodorize and decolorize, etc. It is also widely used in domestic production of mineral water and purified water for sterilization.


(2) Ultraviolet sterilizer 

When microorganisms are irradiated by ultraviolet light, the protein and nucleic acid of microorganisms absorb ultraviolet spectrum energy, resulting in protein denaturation and death of microorganisms. Ultraviolet rays have a certain penetration ability to clean and transparent water, so they can disinfect water. Ultraviolet sterilization can not change the physical and chemical properties of water, and it is widely used because of its fast sterilization speed, high efficiency and no peculiar smell.