What does hollow fiber ultrafiltration do?

Hollow fiber ultrafiltration membrane is a type of ultrafiltration membrane. It is one of the more mature and advanced technologies in ultrafiltration technology. Hollow fiber outer diameter:

Inner diameter: The wall of the hollow fiber tube is covered with micropores, and the pore size is expressed in the molecular weight that can intercept the substance, and the molecular weight can reach thousands to hundreds of thousands. The raw water flows under pressure on the outside of the hollow fiber or in the inner cavity, which constitutes the external pressure type and the internal pressure type respectively.

Ultrafiltration is a dynamic filtration process, and the trapped substances can be eliminated with the concentration of small amounts, which will not clog the membrane surface and can be operated continuously for a long time. Ultrafiltration membrane is one of the earliest polymer separation membranes developed. Ultrafiltration technology is a high-tech technology widely used in the field of water purification, material separation, concentration and purification, as well as the extraction of useful substances from wastewater, wastewater reuse and reuse.

Simple operation, no heating, energy saving, low-pressure operation, small footprint and other characteristics.

1.It is used for bitter alkali water and seawater desalination.

In today's water shortage, improving the conversion rate of fresh water has become one of the powerful measures to resolve the water crisis. Reverse osmosis membrane separation technology has many advantages in the desalination of seawater and brackish water, such as saving investment instruments, low energy consumption and short construction period, and has been widely used in the field of bitter alkali water and seawater desalination in the past ten years.

2.It is used to treat heavy metal wastewater.

Hollow fiber ultrafiltration membranes have a long history in the treatment of heavy metal wastewater. The sub-permeable membrane device is used in the treatment and disposal of electroplating wastewater, and the components are generally internal pressure pipe type or roll type. The industrial-scale hollow fiber ultrafiltration membrane is used by the factory to treat the zinc phosphate electroplating wastewater, which can make 90% of the wastewater be reused.

According to relevant reports, the hollow fiber ultrafiltration membrane has been successful in treating copper cyanide electroplating rinse water, and the rejection rate of this technology is higher.

3.It is used for the preparation of pure water and ultrapure water.

At present, many treatment stations in China now use ultrafiltration technology to treat raw water. In addition, the hollow fiber ultrafiltration membrane process does not use acid, alkali and other harmful substances that damage the environment in its production process, which greatly protects the environment.

4.Used in food processing.

Hollow fiber ultrafiltration membranes are generally used in the food industry for milk processing, beverage and wine processing. Reverse osmosis technology can make whey from waste products into nutritional raw materials, which can improve the productivity of milk powder; Ultrafiltration technology has the advantages of low energy consumption and no phase change in juice production to ensure the quality and taste of juice. The role of ultrafiltration technology in brewing is mainly reflected in the fact that it can make up for the shortcomings of high residual sugar in limited fermentation products and residual cooking taste by distillation, and the use of ultrafiltration technology can produce high-quality alcohol-free beer, and the investment and operation costs are less than those of traditional brewing methods, saving production costs.

5.It is used in the pharmaceutical industry.

Ultrafiltration technology can be used in the field of medicine to treat medical infusion, pharmacy, biochemical products, dialysis, and chemical industry.

6.Used in chemical products.

Ultrafiltration technology can be operated at room temperature and has the characteristics of low energy consumption, high efficiency, simple process and low investment. It can be used as cosmetics, detergents, spices, chemical cooling, chemical manufacturing, etc.

HORIMEM ultrafiltration membranes.

It can be used to remove suspended particles, colloids, microorganisms, etc. in water. Under the action of water pressure, water molecules and small molecules pass through the ultrafiltration membrane, and suspended particles, colloids, and microorganisms in the water are trapped on the inner surface of the ultrafiltration membrane. Due to the small micropores on the ultrafiltration membrane, it can effectively remove various suspended particles, colloids, bacteria and macromolecular organic matter in water, and these trapped substances may accumulate on the inner surface of the membrane, so it is necessary to carry out regular backwashing and dosing cleaning of the ultrafiltration membrane module.

Hollow fiber ultrafiltration membrane is widely used in the preparation of mineral water due to its special properties; pretreatment of reverse osmosis equipment; tap water purification treatment; pretreatment of seawater desalination; Purification of wastewater reuse; Removal of colloids and bacteria from water; Filter out large molecular weight impurities, proteins and polysaccharides in the extract of traditional Chinese medicine, and finally prepare traditional Chinese medicine preparations; Concentrate the active ingredients of traditional Chinese medicine to filter out water and small molecular weight impurities in the liquid medicine; low-alcohol liquor is turbidity and sterilization; refining of fruit wine, beer and other liquors; purify tea juice and prepare concentrated tea; Injections, large infusions to remove heat sources; Concentrate human serum.

The separation or concentration of colloids, proteins, and tiny particles is often used as a pre-filtration for reverse osmosis membranes in seawater desalination to protect reverse osmosis membranes.

**Electrophoretic paint and stable bath parameters.

The hollow fiber ultrafiltration membrane only allows solvents (such as water molecules), inorganic salts and small molecule organic matter in the solution to pass through, and intercepts the suspended solids, colloids, proteins and microorganisms and other macromolecular substances in the solution, so as to achieve the purpose of purification and separation. Ultrafiltration membranes are widely used in water treatment projects. Ultrafiltration technology plays an increasingly important role in reverse osmosis pretreatment, drinking water treatment, reclaimed water reuse and other fields.

Ultrafiltration technology plays a key role in the sterilization and turbidity removal of wine and beverages, the depyrogen removal of pharmaceuticals, and the concentration of food and pharmaceutical preparations. The range of pore size and molecular weight cut-off of ultrafiltration filtration has always been vaguely defined, and it is generally believed that the filter pore size of hollow fiber ultrafiltration membrane is microns, and the cut-off molecular weight is 1000-1000000 dalton.

The filter pore size of the hollow fiber ultrafiltration membrane is microns, and the molecular weight cut-off is 1000-300000 dalton. Hollow fiber ultrafiltration membranes with a pore size greater than microns or a molecular weight cut-off greater than 300,000 daltons should be defined as microfiltration membranes or fine filtration membranes. Generally, the hollow fiber ultrafiltration membrane used for water treatment has a nominal molecular weight cut-off of 30000-300000 dalton, while the ultrafiltration membrane with a molecular weight cut-off of 6000-30000 dalton is mostly used in the fields of material separation, concentration, sterilization and heat source removal.

What is the general service life of ultrafiltration membranes? The life of ultrafiltration membrane is guaranteed for 3 years, and the normal maintenance life can be 5 years or even 8 years of membrane, and the service life has a great relationship with the cleaning and maintenance of the membrane in the process of use.

What is the service life of ultrafiltration membranes?

What is the general service life of ultrafiltration membranes? The life of ultrafiltration membrane is guaranteed for 3 years, and the normal maintenance life can be 5 years or even 8 years of membrane, and the service life has a great relationship with the cleaning and maintenance of the membrane in the process of use.

Precautions for the use of ultrafiltration membranes:

1.The gas in the equipment must be emptied, otherwise when the equipment is started, the gas will form a gas hammer to charge the ultrafiltration membrane, damaging the membrane element.

2.Because ultrafiltration membrane is the most important element in water treatment, we must be careful when using and installing, not too rough, and not thrown on the ground. If the ultrafiltration membrane is to be discontinued, it can be rinsed with clean water first, and then added formaldehyde aqueous solution for disinfection and sterilization, and sealed.

For example, in winter, the module should also be treated with antifreeze, otherwise the ultrafiltration membrane may be scrapped.

3.At the beginning of use, there will be a small amount of protective liquid on the ultrafiltration membrane, if you are used in drinking water or food, you must first go through a period of filtration, after inspection to determine that it meets the requirements of water quality standards before use.

Reasons for the shortened life of ultrafiltration membranes

The pretreatment process was not adjusted in time after the raw water quality was changed.

The treatment effect of the pretreatment process deteriorates.

Ultrafiltration membranes are not cleaned regularly, resulting in degraded performance.

Rinsing with pre-treated water with chemical reagents causes membrane contamination during equipment outages.

The desalination plant needs to be shut down for maintenance on a regular basis, and when the system is emptied and re-operated, the gas is quickly boosted before it is exhausted, resulting in the residual gas forming air hammer and damaging the membrane element.

Generally, the service life of the ultrafiltration membrane will be told to users that the service life of the ultrafiltration membrane is about 3 to 5 years, but this is not absolute, and the service life of the ultrafiltration membrane is greatly related to the change of raw water and maintenance. Many types of membrane elements need to be cleaned during daily use, and this is no different for ultrafiltration membranes. Otherwise, it will affect the performance and life of the ultrafiltration membrane, and the regular cleaning can also maintain the good permeability of the ultrafiltration membrane, and the cleaning method will generally be determined according to the nature of the ultrafiltration membrane and the nature of the treated material liquid, but in most cases it is cleaned with clean water, and then different chemical agents are used to clean it according to different situations.

The purpose of this is mainly to prevent the shrinkage of the ultrafiltration membrane after dehydration, so that the membrane structure is damaged and the permeability decreases. The preservation of the ultrafiltration membrane is very important, which will affect the performance and service life of the ultrafiltration membrane, so it is necessary to clean and sterilize the ultrafiltration membrane in all directions after use.

1. High-quality ultrafiltration membrane module, no defects in pressure resistance and pore size, smooth membrane surface, etc. 2. Correct process flow, ultrafiltration device, especially large device, must have backwashing, rapid flushing, chemical flushing and air flushing and other pipelines and automatic control systems. The simple piping system of one in and two out, although the equipment cost is the lowest, seriously affects the service life of the membrane.

The maintenance of the ultrafiltration membrane should exist from the moment the membrane is put into use, because regular cleaning and maintenance of the membrane can maintain the ultrafiltration membrane with good permeability, and the cleaning method will also be determined according to the properties of the membrane and the nature of the treated material, and the specific results can be divided into the following situations: the electric coating material can be cleaned with ionic solubilizer; Water-soluble coatings can be cleaned with "bridging" solvents; Protein precipitation in the food industry can be cleaned with alkaline detergents based on Ruan enzyme solvents, phosphates, silicates, etc.

The maintenance of ultrafiltration membrane is actually very simple, and the physical cleaning is also very simple, for a part of the detachable ultrafiltration membrane, the membrane pores are not particularly small, and under normal circumstances, they can be directly disassembled and wiped and rinsed with soft items. According to the diameter of the membrane, special equipment can also be used for flushing, and the physical method can be reused, cleaning the ultrafiltration membrane with 30-40 water, some magazines can be removed.

Ultrafiltration membrane cleaning, there are 3-5 types of cleaning, your range of questions is very large, in order to obtain, I will tell you all the situations.

The cleaning of ultrafiltration membrane 1, is backwashing, refers to the ultrafiltration membrane system in the normal process of water production, when the transmembrane pressure difference of the system reaches a certain value, some manufacturers are (time, we generally start automatic backwashing. The process is.

Backflush --- Backflush -- In backflushing, backflushing is designed to be upper-flush and down-recoil according to the size of the system and the quality of the raw water.

2. Chemical cleaning, this is generally when the flux of the system is attenuated by 20%, chemical cleaning, it is necessary to shut down, adopt the method of acid and alkali cleaning, generally soak in the agent for several hours (depending on the pollution situation), and cycle for several hours.

3. There is also dispersed chemical cleaning, etc., there are too many words to type, I embody some principles of cleaning in this, you can contact me if you need detailed operations, and provide technical support for free!!

Physical Cleaning Method:

The physical method is actually to rinse the ultrafiltration membrane with water under a certain pressure, which is also the most commonly used method. Because the direction of this water flushing is different, it can be divided into reverse flushing, backwashing and positive flushing.

1.Reverse flushing: Rinse impurities in the membrane and at the end of the inlet with raw water.

2.Backwashing: Use ultrafiltration water to flush loose and peel off the pollutants on the surface of the membrane, and discharge them from the water inlet and concentration port respectively (acid, alkali or sodium hypochlorite and other chemicals can be added to enhance the cleaning effect).

Maintenance of ultrafiltration membranes:

1.The hollow fiber ultrafiltration membrane is an organic polymer material, which has the corresponding temperature, pressure, acidity, alkalinity and oxidation tolerance range, so it should not exceed the upper limit when used, and it is best not to use it at the upper limit for a long time to ensure that the system is used for a longer time. Operation and maintenance also require a serious attitude and the right approach.

2.The influent water should not contain hard particles or lumpy objects to avoid damage to the membrane.

3.The cleaning is carried out regularly, and the cleaning time of pickling and alkali washing is not less than half an hour.

4.Regularly inspect the bolts on the system piping for tightening.

5.Each time the membrane is washed, the membrane must be restored to the water flux before use, otherwise it will need to be re-cleaned or a different cleaning agent should be considered.

6.If there is an abnormality, stop the machine immediately, then check the cause, and record it.

7.The water used for membrane washing must be deionized or at least demineralized.