How to physically clean Hyde ultrafiltration membrane?

The physical cleaning of Hydeneng ultrafiltration membranes mainly includes isobaric cleaning method, high-purity water circulation cleaning method and reverse cleaning.

1.Isobaric cleaning method:That is, close the ultrafiltration water valve, open the concentrated water outlet valve, and increase the flow rate to flush the membrane surface. This method can effectively remove a large number of soft impurities from the membrane surface.

2.High Purity Water Cleaning Method:As the purity of the water increases, the solubility increases. When cleaning the equipment, the loose dirt on the surface should be rinsed off with ultrafiltration membrane water, and then the pure water circulation cleaning should be carried out.

3.Backwash method:That is, the cleaning water enters and penetrates into the membrane through the ultrafiltration port of the membrane, and rushes to the side of the concentrator port.

The backwash method is effective in removing coverage, but special care should be taken during the backwash process to prevent overpressure to avoid membrane rupture or damage to the sealing surface.

1. Microbial contamination.

When the contaminant is bacteria or viruses, it can be cleaned with hydrogen peroxide at a concentration of 1 percent, and the Drammel ultrafiltration membrane can also be chemically cleaned with a 50ppm sodium hypochlorite solution.

2. Inorganic pollution.

When the contaminant is inorganic colloid, iron salt or calcium carbonate, hydrochloric acid, citric acid or oxalic acid solution can be used for cleaning, and the pH value should be controlled at about 2. When the contaminant is some insoluble inorganic salts such as calcium sulfate or barium sulfate, EDTA solution with a concentration of 1% can be used for cleaning.

3. Organic pollution.

When the contaminants are oil, starch, protein or polysaccharides, they can be cleaned with amylase, protease, etc. at a concentration. When the contaminants of Drammel ultrafiltration membranes are organic colloids, fats, or humic acids, they can be cleaned with a sodium hydroxide solution with a pH of 12. When the contaminants are grease substances or some organic substances that are difficult to clean, sodium dodecyl sulfate can be used for cleaning, and the concentration should be controlled at about that.

Hyde can clean ultrafiltration membranes by physical method.

Any equipment needs to be overhauled after a period of use, and the same is true for hollow fiber ultrafiltration equipment. The most important hollow fiber ultrafiltration membrane in the equipment will be constantly polluted and clogged by the impurities and pollutants it retains during the operation of the equipment, and the membrane element can be cleaned by physical methods to volatilize its properties. Physical cleaning mainly includes isobaric cleaning, cyclic cleaning and reverse cleaning.

Many people are very troublesome to physically clean supermodels.

Hyde ultrafiltration membrane is a membrane with very precise filtration performance so far, and it is precisely because of Hyde ultrafiltration membrane that the treated water can be purer. Hyde ultrafiltration membranes are very widely used and are now used in many fields, such as medicine, food, water treatment and other different fields, with good practical performance. So how should Hyde ultrafiltration membranes be maintained and flushed?

Let's take a closer look.

The maintenance of Hyde ultrafiltration membrane should exist from the moment the membrane is put into use, because regular cleaning and good maintenance of the membrane can maintain the good permeability of Hyde ultrafiltration membrane. In addition, the cleaning method will also be determined according to the nature of the membrane and the nature of the treatment liquid.

The maintenance of Hyde ultrafiltration membrane is actually very simple, and the physical cleaning is also very simple, for some detachable Hyde ultrafiltration membranes, the membrane pores are not particularly small, and they can be directly disassembled and wiped and rinsed with soft items under normal circumstances. Depending on the diameter of the membrane, special equipment can also be used for flushing, and the physical method can be reused.

Hyde ultrafiltration membranes should also be stored after use, and they will generally be stored in the protective solution, which can also effectively prevent the shrinkage of the membrane after dehydration, the destruction of the membrane, and the decrease of permeability. Preservation will also be divided into short-term storage and long-term storage, short-term storage is generally suspended after use, less than ten days to sterilize and sterilize the membrane, the membrane drain valve and regulating valve closed, to protect the performance of the membrane. Long-term storage means that after stopping use, more than 10 days, it must be sterilized and sterilized, and then sealed and stored.

Compared with the conventional drinking water advanced treatment process, the Hydenon ultrafiltration membrane process has the following advantages:

1. The filtration accuracy is extremely high, and it has a high removal rate for suspended solids, microorganisms and colloids.

2. The quality of the produced water is stable and less affected by the fluctuation of the influent water.

3. The modular device design not only meets the needs of large-scale water plants, but also is more suitable for small-scale decentralized water supply systems.

4. The process is short, and there is no need to add or add a small amount of chemicals, which is convenient for self-control.

Ultrafiltration membranes can intercept most of the suspended solids and colloids in water, but cannot remove dissolved small molecules, which hinders the application of ultrafiltration technology in drinking water treatment, but can be combined with other processes to solve the above problems.

The timing of cleaning is mainly selected according to the change of the following parameters:

1. Under the normal feed water pressure, the water yield is 10% 15% lower than the normal value

2. In order to maintain the normal water production, the ground water supply pressure is increased by 10% and 15% after temperature correction.

3. The quality of the produced water is reduced by 10% and 15%, and the salt permeability rate is increased by 10% and 15%.

4. The pressure difference between each section of the system increases significantly.

How can I tell if a Hydenner nanofiltration device needs to be cleaned?

Standardized freshwater production has fallen by more than 10 percent.

The standardized salt permeability has increased by more than 10%.

In order to maintain a normal flow rate of fresh water, the pressure difference between the feed water and the brine water was increased by more than 10% after temperature calibration.

There are serious contaminants and fouling inside the unit.

Before the device is deactivated for a long time.

Routine maintenance of the device.

After the operation data is standardized, the water yield of the system is reduced by more than 15% compared with the initial value.

After the operation data was normalized, the salt transmittance increased by more than 10% compared to the initial value.

After the operation data is normalized, the pressure differential of the pressure vessel exceeds the initial value by more than 15%.

Hyde can reverse osmosis membrane chemical cleaning method:

1.Enzyme detergent is added and the membrane is treated with enzymatic detergent. It is particularly effective against organic pollution, especially organic substances such as proteins and oils. If it is better at 50 -60, it usually runs in 10 days.

2.Rinse the citric acid solution with 1%-2% citric acid in water continuously or cyclically at high or low pressure. This method has a good cleaning effect on Fe(OH)3 pollution.

3.Ammonium citrate solution, citric acid solution plus ammonia or solutions with different pH values, HCL can also be added in ammonium citrate solution to adjust the pH value to, such as in 190L deionized water, dissolve 277g of amine citrate, adjust the pH value of the solution with HCl to, and use this solution to circulate, wash in the membrane system for 6 hours. It works very well.

4.Concentrated saline, membranes that are heavily contaminated with the limbs can be cleaned with concentrated saline. This is because high concentrations of brine weaken colloidal interactions and promote colloidal aggregation to form micelles.

5.Dilute the hydrogen peroxide solution with 12 L of deionized water. This method is particularly effective for organic contamination.

6.Sodium hypochlorite and formaldehyde solution, for bacterial contamination, different treatment measures are taken according to different membranes, aromatic polyamide membranes can be washed with 1% (weight) of formaldehyde solution, while continuously analyzing reverse osmosis concentrated water to prevent bacterial growth.

7.Oxalic acid and EDTA solution for the precipitation of metal oxides on Guangzhou Hyde Neng reverse osmosis membranes.

8.Water-soluble emulsion that is very effective in cleaning membranes contaminated with oil and iron oxides. Generally clean for 30-60 minutes.

1. Use a pump to pump the clean, free chlorine-free Hyde Neng reverse osmosis membrane product water from the cleaning box into the pressure vessel and discharge it for a few minutes.

2. Prepare the cleaning solution in the cleaning box with clean Hyde reverse osmosis membrane product water.

3. Circulate the cleaning solution in the pressure vessel for 1 hour or a pre-set time, with a flow rate of 35 40 gallons min (133 151 liter min) for an 8-inch or inch pressure vessel, 15 20 gallon minutes (57 76 liters min) for a 6-inch pressure vessel, and 9 10 gallon minutes (34 38 liters min) for a 4-inch pressure vessel.

Precautions for the use of Hyde Neng ultrafiltration membrane:

1.The number of components used in the filtration system is determined according to the total design permeability, and the nominal hourly water production of each module refers to the permeability rate of pure water, which refers to the use of pure water as the test medium, and the pure water does not have the problem of clogging caused by solutes to the Hydenon ultrafiltration membrane.

The actual permeability rate of the ultrafiltration system composed of multiple components is about 90% of the nominal, but because the permeability rate of the device gradually decreases with the operation time, it can basically be restored to a relatively stable value after cleaning, under normal circumstances, the stable value is only about 60% of the initial permeability rate, in addition, the permeability of the ultrafiltration component is also affected by temperature, pressure, feed liquid concentration, and feed water turbidity.

2.Since the protective liquid is added to each ultrafiltration component before leaving the factory, the protective liquid in the component should be thoroughly rinsed before use, first rinsed with low pressure (feed water for 1 hour, and then washed with high pressure (feed water for 1 hour, regardless of low pressure or high pressure flushing, the system's permeate discharge valve should be fully opened. When using permeate water, it should be checked and confirmed that the product water does not contain any biocides.

3.Because ultrafiltration components are precision equipment, they should be careful when using and installing, and they should be handled with care, and they should not be broken. If the component is out of use, it should be rinsed with clean water first, and then disinfected and sterilized with formaldehyde aqueous solution, and sealed.

For example, in winter, the module should also be frost-proofed, otherwise the module may be scrapped.

The control and prevention of HEDENENA membrane fouling need to pay attention to the following two aspects:

1. Improve pretreatment

We all know that the quality of water supply is the premise of ensuring the desalination rate, water permeability and service life of the HEDENENA nanofiltration membrane device, so the raw water entering the membrane device must have good pretreatment, and reasonable pretreatment is very important for the long-term safe operation of the HEDENEN nanofiltration membrane device. With pretreatment that meets the requirements of influent water quality, it is possible:

1.Prevent contamination on the membrane surface, that is, prevent suspended impurities, microorganisms, colloidal substances, etc. from adhering to the membrane surface or fouling the water flow channel of the membrane element.

2.Prevents fouling on the membrane surface. During the operation of the device, due to the concentration of water, some insoluble salts are deposited on the surface of the membrane, so it is necessary to prevent the formation of these insoluble salts.

3.Ensure that the membrane is protected from mechanical and chemical damage so that the membrane has good performance and long enough service time.

2. Clean the Hydeneng nanofiltration membrane

Although the feed liquid has undergone various pretreatment measures, the surface of the film may also be deposited and scaled after long-term use, which will block the membrane pores and reduce the water production, so the polluted film should be cleaned regularly. Understand the characteristics of local water quality, perform chemical analysis of contaminants, and analyze the results to select cleaning agents and cleaning methods.

At present, the methods for controlling the pollution of Heidenen's nanofiltration membrane process can be roughly divided into the following four types:

1.Cleaning: The choice of cleaning method mainly depends on the configuration of the HEDENNER membrane, the type of membrane and the ability to resist chemical reagents, as well as the type of contaminants.

2.Change the properties of the material: before membrane filtration, pretreatment of the material liquid such as heat treatment, adding compounding agent (EDTA, etc.), activated carbon adsorption, pre-microfiltration and pre-ultrafiltration, etc., to remove some larger particles; It is also possible to adjust the pH away from the isoelectric point of the protein, thereby mitigating membrane fouling due to adsorption.

3.Changing the mode of operation: Changing the mode of operation is actually improving the flow mode of the membrane surface, and the main methods are:

One is to adopt a certain operation strategy in the membrane process; The other is to optimize and improve the structural design of membrane modules and membrane systems. With these two methods, the flow of fluid through the membrane module can be ideally reduced from membrane fouling and concentration polarization.

Although membrane fouling is inevitable in the application of HEDENENER membranes, the degree of membrane fouling can be reduced by taking appropriate measures for different membrane fouling. More information about Hyde Energy Technical Consulting can be consultedWater sky blue environmental protection

Hyde Reverse Osmosis membrane is the core component of the reverse osmosis principle, and the reverse osmosis device has been widely used in the sub-osmosis equipment with its compact structure, simple installation, easy operation, low energy consumption, operation at room temperature, and easy industrial production.

In the process of using water treatment equipment, the fouling phenomenon of Hydeneng CPA2-4040 membrane element is widespread, the reason is that during the operation of the device, the pressure generated during the low-pressure flushing process of reverse osmosis membrane equipment will produce fresh water, and the concentration of water on both sides will naturally deepen, and the deepening will also lead to the deepening of the concentration of salt, which contains a large number of precipitable substances, and over time, scaling will occur.

In terms of design, in order to be able to replace the reverse osmosis brine device well, the salt content of the brine should be as low as possible. In addition, the uneven mixing during the dosing process is also an important cause of scaling of the reverse osmosis membrane. Secondly, the leakage of the antiscalant device is more serious, which is very likely to affect the dosage of reverse osmosis plus antiscalant.

Finally, in the course of operation. Not enough attention is paid to it, and many times the flushing is not carried out in time during the shutdown. RO reverse osmosis is a kind of pure water machine that can be directly consumed by humans through the internationally popular reverse osmosis and other methods, after filtering the raw water without adding any compounds.

In short, Hyde can effectively prevent the occurrence of reverse osmosis membrane fouling from the aspect of filtration rate, combined with the membrane treatment of reverse osmosis equipment.