What are the main areas of HEIDNER nanofiltration membranes?

Application areas of Heidenener nanofiltration membranes:

1.Applications in the food processing industry. At the same time, the nanofiltration membrane also has good desalination performance, which can effectively reduce the corrosion of salt to the evaporator, so it has been well used in the processing of cheese and yeast.

2.It is used in drinking water treatment equipment. In general, there are many applications for nanofiltration membranes in the field of softening and removal of organic matter in drinking water.

With the deterioration of the environment and the aggravation of water pollution, water quality problems have begun to receive more and more attention. Experiments have proved that nanofiltration membranes can remove pesticides, sulfates and nitrates produced during the disinfection process of drinking water, and its produced water quality standards are high and stable.

3.Applications in the pharmaceutical industry. The application of nanofiltration membranes can effectively purify and concentrate biochemical reagents, while also removing trace organic contamination and some low molecular weight salts.

4.Extraction and refining in the petroleum industry. In the process of offshore oil exploitation, nanofiltration membranes can be applied to separate and filter the wastewater discharged after the separation of seawater and **.

5.** and removal of small molecule organic matter. Nanofiltration membranes have the ability to separate small organic molecules.

Softened water treatment.

It can effectively intercept divalent ions, with low operating pressure and large water flux. Its main advantages are no sludge, no need for regeneration, complete removal of suspended solids and organic matter, simple operation, less land occupation, etc.

Drinking water purification.

Hyde Nanofiltration membranes can remove microtoxic by-products, trace amounts of herbicides, insecticides, heavy metals, natural organic matter and hardness, sulfates and nitrates generated by the disinfection process. At the same time, it has the advantages of good and stable treatment water quality, less chemical dosage, less land occupation, energy saving, easy management and maintenance, and basically zero discharge.

Nitrate removal from groundwater.

The permeate of the HEDENENER membrane contains a high content of nitrate, and after passing through the ion exchange column, the nitrate ions are exchanged by chloride ions, and the nitrate content in the water meets the requirements of drinking water.

Papermaking wastewater treatment.

Paper mill flushing wastewater contains a large number of pollutants, and Heidenener nanofiltration membranes can replace absorption and electrochemical methods to remove dark lignin and chlorinated lignin from the pulp bleaching process, because many of the organic matter in the pollutants is negatively charged, they are easily trapped by positively charged nanofiltration membranes, and do not cause large pollution to the membrane.

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

In order to ensure the normal and reliable operation of the system, it is necessary to control the operating conditions of the process system. The following points need to be paid attention to in the normal operation of Heide nanofiltration membranes:

Value:Different nanofiltration membranes have different pH ranges.

2.Temperature:It should be noted that the operating temperature should not exceed the heat-resistant temperature of the Hydenener membrane, otherwise the service life of the Hydronert membrane will be affected.

3.Pretreatment:The pH value of the treated material liquid, the suspended solids contained in it and the microbial mass will affect the effect of the HEIDNER nanofiltration membrane, so it is necessary to take effective pretreatment measures for the raw water, such as pH adjustment, filtration, disinfection, etc., to give full play to the working efficiency of the HEIDNER nanofiltration membrane.

4.Operating Pressure:The appropriate operating pressure should be selected according to the actual processing liquid and the pressure resistance of the selected Heidenena membrane.

5.Cleaning effect of membrane modules:Even if the material liquid is pretreated before operation, the membrane contamination cannot be completely eliminated, and the membrane pollution will cause a decrease in water yield and desalination rate, and will have a great impact on the life of the Hydenener membrane, and even cause the operation of the treatment system to be paralyzed.

Therefore, it is necessary to clean the HEDENENC membrane modules regularly according to the actual situation.

What should be paid attention to in the normal operation of Hyde nanofiltration membrane?

1. When the pH value is greater than 10, the continuous operating temperature is 35, when the inlet water contains free chlorine or other oxidizing substances, because its oxidation performance will seriously damage the performance of the ring membrane, it is recommended that users remove free chlorine or other oxidizing substances in the pretreatment.

2. The membrane elements are tested by water before leaving the factory, and are vacuum-encapsulated in a concentration of sodium bisulfite and a concentration of 20ppm isothiazolinone protective solution. In severe cold regions, glycerin with a concentration of 10% is added to the protective solution as an antifreeze. In order to prevent the growth of microorganisms during short-term storage, transportation and system shutdown, it is recommended to soak the membrane elements with sodium bisulfite protective solution.

3. Try not to unpack the membrane element before it is put into use, and once unpacked, it should always be kept wet.

4. The water inlet of the membrane element should be gradually pressurized, and the time to the normal operation state should not be less than 30-60 seconds, and the flow rate of the inlet water of the membrane element should be gradually increased, and the time to the specified value should not be less than 15-20 seconds.

5. The production water of the system should be discharged for the first time, and the discharge time should be at least one hour.

6. The membrane element needs to be used for at least six hours before it can be disinfected with formaldehyde. If formaldehyde is used within six hours, it may result in a loss of flux.

7. The back pressure of the produced water shall not exceed at any time. The maximum allowable pressure drop per pressure vessel is 50 psi (.