Ultrafiltration membrane water purifier, what is the water purification principle of ultrafiltration

The filtration accuracy of ultrafiltration is 0 00 1-0 1 microns, which belongs to one of the high-tech trees in the 21st century. It is a kind of membrane separation technology that uses pressure difference, which can filter out harmful substances such as rust, sediment, suspended solids, colloids, bacteria, macromolecular organic matter in water, and can retain some mineral elements that are beneficial to the human body. It is the core component in the production process of mineral water and mountain spring water.

The ** rate of water in the ultrafiltration process is as high as 95 or more, and it can be easily flushed and backwashed, which is not easy to plug and has a relatively long service life. Ultrafiltration does not need to be pressurized, and can be filtered only by relying on tap water pressure, with large flow and low cost, which is more suitable for the comprehensive purification of household drinking water. Therefore, in the future, the purification of drinking water will be based on ultrafiltration technology, combined with other filter materials, in order to achieve a wider treatment range and eliminate calcium staining substances in the water more comprehensively.

The imported brand of Nuorite and 3M water purifiers use ultrafiltration technology, and the ultrafiltration membrane can directly filter all substances in the water, but most of the domestic brands, ultrafiltration membranes are brittle and cannot withstand too much water pressure washing, and long-term high-pressure washing will cause damage to the ultrafiltration membrane and affect the effect of filtration.

Secondly, the water purifier using ultrafiltration membrane will be very expensive, compared with the general water purifier with microfiltration and activated carbon, the price is usually 3 to 5 times, and the consumables are replaced more frequently.

Therefore, when choosing a water purifier, you must be optimistic about the brand's technology, and the price of the easily damaged ultrafiltration membrane is so expensive, it is better not to use it, this depends on yourself.

Jingzhiquan is the right choice, and it is one of the most important products in the industry.

It is a professional manufacturer of ultrafiltration membrane water purifier. I also use the Pure Spring Water Purifier at home. It works well.

The water purifier is made of PAN polymer polypropylene ultrafiltration membrane, which has high strength and corrosion resistance, and its activated carbon filter element adopts micro-permeation patented technology, coupled with the use of Dutch Norit powder activated carbon and micropurification, multi-pleated refiltration microfiltration membrane, the adsorption effect is better and the taste is excellent. It is recommended to buy the ultrafiltration + micro-osmosis combination of Sebokang!!

What is the filtration principle of ultrafiltration membranes? In the screening process of ultrafiltration membrane, the pressure difference between the two sides of the membrane is used as the driving force, and the ultrafiltration membrane is used as the filter medium, under a certain pressure, when the stock solution flows through the membrane surface, many small micropores densely covered on the surface of the ultrafiltration membrane only allow water and small molecule substances to pass through and become permeable liquid, and the substances with a volume larger than the micropore size on the membrane surface in the stock solution are intercepted on the inlet side of the membrane and become a concentrated liquid, so as to achieve the purpose of purification, separation and concentration of the original solution.

There are about 6 billion micron pores on the wall of each meter-long ultrafiltration membrane filament, and its pore size only allows water molecules, beneficial minerals and trace elements in water to pass through, while the volume of smaller bacteria is above microns, so bacteria and colloids, rust, suspended solids, sediment, macromolecular organic matter, etc., which are much larger than the volume of bacteria, can be intercepted by the ultrafiltration membrane, so as to achieve the purification process. Under the condition that the water yield per unit membrane area remains the same, the larger the membrane area filled by the filter element, the more the total water yield of the filter element.

The question you are asking about is from the inside to the outside, or from the outside to the inside, both of these are because there are two kinds of ultrafiltration membranes: internal pressure type and external pressure type.

The internal pressure ultrafiltration membrane is from the inside to the outside.

The external pressure ultrafiltration membrane is from the outside to the inside.

How ultrafiltration membranes work:The water to be filtered enters the ultrafiltration membrane tube, and under the action of the water pressure difference on both sides of the membrane, the small molecule beneficial substances are passed through the other end of the water outlet through the dense pore size on the surface of the membrane, and turned into purified water. Substances that do not pass through or large molecular weights will remain on the side of the membrane.

So as to achieve the purpose of purification, separation, and concentration of the solution.

In fact, the principle of ultrafiltration membranes is not complicated. In the ultrafiltration process, the impurities that are trapped will stay on the surface of the membrane, which will produce the phenomenon of concentration polarization, and when the concentration of impurities on the membrane surface reaches a certain level, a layer will be formed, which will cause the water permeability of the membrane to drop sharply, which will affect the application of ultrafiltration to a certain extent. Therefore, research is needed to determine the optimal process and operating conditions to minimize the effects of concentration polarization, so that ultrafiltration can become a reliable reverse osmosis pretreatment method.

Structure of an ultrafiltration membrane:The structure of ultrafiltration membranes is symmetrical and asymmetrical. The former is isotropic, without cortex, the pores are the same in all directions, and belong to depth filtration; The latter has a denser surface layer and a bottom layer dominated by finger-like structures, with a surface thickness of microns or less, and has well-arranged micropores, and the bottom layer has a thickness of 200 250 microns, which belongs to surface filtration.

Ultrafiltration membranes used in industry are generally asymmetrical membranes. The membrane materials of ultrafiltration membranes mainly include cellulose and its derivatives, polycarbonate, polyvinyl chloride, polyvinylidene fluoride, polysulfone, polyacrylonitrile, polyamide, polysulfonamide, sulfonated polysulfone, cross-chain polyvinyl alcohol, modified acrylic polymer, etc.

Ultrafiltration membranes can also be divided into plate-and-frame, tube-based, coil-based, and hollow-fiber types.

Ultrafiltration (UF) technology is a membrane separation technology between microfiltration and nanofiltration, with an average pore size of 3 100

nm, which has the functions of purification, separation, and concentration of solutions. The retention mechanism mainly includes the sieving effect and electrostatic action of the membrane, and the filter medium is the ultrafiltration membrane, driven by the pressure difference between the two sides, only the low molecular weight solute and water can pass through the ultrafiltration membrane, so as to achieve the purpose of purification, separation and concentration. Ultrafiltration membrane technology has a wide range of applications, the earliest used ultrafiltration membrane is a natural animal organ membrane, and the initial ultrafiltration has been an experimental work and has not been developed until.

20th century 70

Ultrafiltration technology has only entered the stage of rapid development of industrial applications. At present (2018), ultrafiltration membrane materials have been expanded from cellulose acetate (Ca) to polystyrene (PS), polyvinylidene fluoride (PVDF), polycarbonate (PC), polyacrylonitrile (PAN), polyethersulfone (PES) and nylon (PA), etc., with molecular weight cut-off from.

103 to 106. Due to the simplicity of the equipment of ultrafiltration.

With the characteristics of small footprint, constant phase, low operating pressure, low material requirements, simple equipment, etc., its application scope has also rapidly extended from the research field to the practical application field, such as electronics, medicine, electrophoretic paint, beverage, food and chemical industry, medical treatment and wastewater treatment and utilization.

Ultrafiltration is a pressurized membrane separation technology, that is, under a certain pressure, the small molecule solute and solvent pass through a special membrane with a certain pore size, so that the macromolecular solute can not be penetrated and remains on one side of the membrane, so that the macromolecular substances are partially purified. The principle of ultrafiltration is also a membrane separation process principle, ultrafiltration uses a pressure-active membrane to intercept colloids, particles and relatively high molecular weight substances in water under the action of external driving force (pressure), and water and small solute particles pass through the membrane separation process.

Lisheng capillary PVC alloy ultrafiltration membrane is the core filtration component, which is a patented product independently developed by Lisheng.

PVC alloy capillary ultrafiltration membrane is pure physical filtration, no additives, no disinfection by-products, its filtration pore size is fine to microns, can efficiently remove particles in the water body, bacteria, viruses, colloids, macromolecular organic matter and other pollutants, while retaining minerals and trace elements beneficial to the human body, is a safe and stable water treatment method.

The effluent quality conforms to the "Hygienic Standard for Drinking Water" (GB 5749-2006), which is a healthy and high-quality direct drinking water.

Principle of ultrafiltration membrane filtration.

Ultrafiltration is a sieving process related to the pore size of the membrane, with the pressure difference between the two sides of the membrane as the driving force, with the ultrafiltration membrane as the filter medium, under a certain pressure, when the stock solution flows through the membrane surface, many small micropores densely covered on the surface of the ultrafiltration membrane only allow water and small molecule substances to pass through and become permeable liquid, and the volume of the substance larger than the micropore size of the membrane surface in the stock solution is intercepted on the inlet side of the membrane and becomes a concentrate, so as to achieve the purpose of purification, separation and concentration of the stock solution.

Ultrafiltration membrane filtration method.

A hollow fiber ultrafiltration membrane module is mainly composed of hundreds to thousands of hollow fiber filaments and membrane shells, and the ultrafiltration membrane between the inner diameter of the hollow fiber is generally called capillary ultrafiltration membrane, and the capillary ultrafiltration membrane is not easy to be blocked by large particulate matter because of its large inner diameter, and is more suitable for the occasion with a large concentration of filtered stock solution.

a) Internal pressure filtration:

The stock solution is first fed from the inner hole of the membrane filament, driven by the pressure difference, and penetrates through the hollow fiber into a permeable liquid along the radial direction from the inside to the outside for internal pressure filtration, which can use high-pressure and high-flow forward flushing, so that the flushing water flow and the membrane pores flow quickly in the tangential direction, so that the pollutants adsorbed on the surface of the membrane pores can be washed away and the water flux of the membrane can be restored.

b) External pressure filtration:

The stock solution is driven by the pressure difference and penetrates through the hollow fiber membrane filament from the outside to the inside in the radial direction to become a permeable liquid, and the trapped substance is filtered by external pressure when it collects on the outside of the hollow filament. : The external pressure ultrafiltration membrane is sealed in the membrane shell, and there are many dead angles of water flow, so it is impossible to remove the pollutants attached to the membrane surface by using the fast direct flushing method, so it cannot be completely decontaminated.

Summary. Hello subject.

Ultrafiltration water purifiers are very necessary for areas with relatively good water quality and environment.

Because we all know that in areas with better water quality and environment, the water quality contains only some sediment, colloids and bacteria, and there will be no heavy metals and chemical pollutants.

Therefore, at this time, we use ultrafiltration water purifiers, which can effectively remove pollutants in the water and retain the minerals in the water.

The most important thing is that the ultrafiltration water purifier does not use electricity, does not waste water, has a large flow rate, and has a long filter life (1-5 years).

Hello subject. Ultrafiltration water purifiers are very necessary for areas with relatively good water quality and environment. Because we all know that in areas with better water quality and environment, the water quality contains only some sediment, colloids and bacteria, and there will be no heavy metals and chemical pollutants.

Therefore, at this time, we use ultrafiltration water purifiers, which can effectively remove pollutants in the water and retain the minerals in the water. The most important thing is that the ultrafiltration water purifier does not use electricity, does not waste water, has a large flow rate, and has a long filter life (1-5 years).

1. Shenzhen Aolanxi Electric Appliance ****

Main products: air purifiers, water purifiers, ultrafiltration water purifiers, fruit and vegetable machines, air humidifiers, pipeline machines, etc.

2. Sichuan Xixi Science and Technology ****.

Main Products: Laboratory Ultrapure Water Machine; Laboratory water purifier; biochemical instrument water purifier; ultrapure water machine; deionized water equipment; reverse osmosis RO equipment; Household water purifier.

3. Xiamen Panshengli electrical equipment.

Main Products: Water Purifier, Ultrafiltration Water Purifier, Kitchen Water Purifier.

4. Zhongshan Di Zhimei Electric Appliance ****.

Main Products: Water Purifier, Direct Drinking Water Machine, Reverse Osmosis Water Purifier, Reverse Osmosis Water Machine, Water Filter, Filter RO Membrane Water Filter, Ultrafiltration Water Purifier, RO Water Purifier.

5. Yuyao Handes Water Purification Equipment Manufacturing Factory.

Main Products: Water Purifiers, Water Purifiers, Household Water Purifiers, Ultrafiltration Water Purifiers, Pipeline Machines, Stainless Steel Water Purifiers, Water Purifiers.

There are more and more brands of water purifiers, not to mention thousands, and the quality is uneven. People who don't understand water purifiers will be unfamiliar with this brand. Here, based on some comprehensive evaluations in the industry, we have come up with a water purifier brand that is worth buying.

While we can't guarantee that they are 100% correct, at least the brand and quality are ***.

Some time ago, a friend's home decoration used Lisheng's whole house water purification solution, and he said it was very good. According to him, as early as 1998, Lisheng water purification entered the field of household water purification, and took the lead in putting forward the concept of "diet and bathing ** water purification", and developed a whole-house ** water purification system with ultrafiltration as the core, including ** ultrafiltration water purifier and a variety of terminal ultrafiltration partners, etc., which can be freely used to meet a variety of water purification needs in household scenarios.

My friend's home is Lisheng pre-filter P6 + ultrafiltration water purifier LH3-62C + water purifier M8B + water softener S5, as well as a combination of multiple wall-mounted pipeline machines D7 family water purifiers.

The biggest advantage of this water purification combination is that it has a large flow rate and clean clean water, which can cope with domestic drinking water. Ultrafiltration water purifier LH3-62C has a large flow rate, high water purification efficiency, and low cost. The water purifier M8B has four fine filtered water purification, and the direct drinking water is connected to the kitchen and living room pipeline machine D7,3S to produce hot water to ensure the application needs of household hot water.

In addition, the sterile water from the LH3-62C** water purifier is softened through the water softener and the calcium and magnesium ions are removed, which is good for washing, bathing and water heaters.