Microfiltration Solid-Liquid Separator Manufacturers

How do microfiltration solid-liquid separator manufacturers choose suitable microfiltration membrane materials to balance the filtration efficiency, corrosion resistance and mechanical strength of microfiltration solid-liquid separators?

Understand the basic classification and performance of microfiltration membrane materials
Microfiltration membrane materials are mainly divided into two categories: organic polymer materials and inorganic materials.

1. Organic polymer materials
Cellulose: such as cellulose nitrate, cellulose acetate, etc., with good pore-forming properties and good hydrophilicity, but the pH value application range is narrow and not suitable for strong acid and strong alkali environments.
Polysulfone: such as polysulfone, polyethersulfone, etc., with good chemical stability, good thermal stability, high mechanical strength, and resistance to acid, alkali and aliphatic hydrocarbon solvents.
Polyamide: such as nylon 6, nylon 66, etc., with high strength and high melting point, stable to chemical reagents (except strong acids), but extremely sensitive to chlorine.
Polyolefin: such as polyethylene, polypropylene, etc., polypropylene materials have a high softening temperature, are resistant to acids, alkalis and various organic solvents, have good chemical stability and excellent mechanical properties.
Ethylene polymers: such as polyacrylonitrile and polyvinyl chloride, each has its own unique light resistance and temperature resistance, but attention should be paid to its alkali resistance or light and heat stability.
Fluoropolymers: such as polytetrafluoroethylene and polyvinylidene fluoride, etc., have extremely strong chemical stability, high temperature resistance, strong acid, strong alkali and various organic solvents.

2. Inorganic materials
Inorganic ceramic materials: such as alumina and zirconium oxide, have good corrosion resistance and mechanical strength.
Microporous glass, aluminum and stainless steel microporous membranes, molecular sieves, etc. are also often used in specific occasions.
Selection principle of balancing filtration efficiency, corrosion resistance and mechanical strength
Filtration efficiency:
Select the appropriate pore size according to the size of the solid particles to be separated. The smaller the pore size, the higher the filtration efficiency, but it may increase the filtration resistance and energy consumption.
Consider the hydrophilicity or hydrophobicity of the membrane material, as well as its adsorption to specific substances to optimize the filtration effect.
Corrosion resistance:
Select the appropriate material according to the chemical properties of the treated liquid (such as pH value, whether it contains corrosive substances, etc.). Materials with good chemical stability, such as polysulfones, fluoropolymers, etc., are preferred to ensure long-term reliability.
Mechanical strength:
Ensure that the selected material has sufficient mechanical strength to withstand the pressure and mechanical stress during the filtration process.
Consider the material's wear resistance, tear resistance and other properties to improve the service life and stability of the equipment.

How can suppliers of microfiltration solid-liquid separators accurately control the filtration accuracy of microfiltration membranes of microfiltration solid-liquid separators to meet the requirements of solid-liquid separation accuracy in different industries?

1. Select the appropriate microfiltration membrane material
Material properties: Microfiltration membranes of different materials have different pore size distribution, mechanical strength, chemical stability, thermal stability and other characteristics. According to the properties of the separated substances (such as particle size, shape, surface charge, etc.) and process requirements, selecting the appropriate microfiltration membrane material is the first step.
Aperture control: The filtration accuracy of the microfiltration membrane is mainly determined by its pore size. Generally, the pore size range of the microfiltration membrane is between 0.1-30μm. By accurately controlling the membrane preparation process (such as stretching, sintering, phase inversion, etc.), the membrane pore size can be accurately controlled.

2. Optimize membrane component design
Membrane area: Increasing the membrane area can increase the processing volume, but it will also increase cost and complexity. It needs to be weighed according to specific needs.
Flow channel design: Reasonable flow channel design can reduce fluid resistance, improve filtration efficiency, and help reduce membrane fouling.
Support structure: The design of the support structure should ensure the stability of the membrane and prevent the membrane from deforming or rupturing during operation.

3. Adjust operating parameters
Filtration pressure: Filtration pressure is an important factor affecting filtration accuracy and flux. Appropriately increasing the filtration pressure can increase the flux, but it may also lead to increased membrane pollution and decreased filtration accuracy. Therefore, the filtration pressure needs to be adjusted according to actual conditions.
Temperature: Temperature has a certain effect on the permeability and selectivity of the membrane. In some cases, appropriately increasing the temperature can improve the filtration performance of the membrane.
Flow rate: Too fast or too slow flow rate may lead to decreased filtration accuracy. The flow rate needs to be adjusted according to the characteristics of the membrane and the properties of the separated substances to maintain the best filtration effect.

4. Regular maintenance and cleaning
Cleaning: Regular cleaning of the membrane surface can remove accumulated pollutants and restore the filtration performance of the membrane. Cleaning methods include physical cleaning (such as backwashing, air washing, etc.) and chemical cleaning (such as using acid and alkali solutions, oxidants, etc.).
Replacement: When the membrane is severely polluted and cannot be restored by cleaning, it is necessary to replace the new membrane in time to ensure filtration accuracy and stability.

5. Use auxiliary technology
Pretreatment: Pretreatment before microfiltration (such as precipitation, coagulation, adsorption, etc.) can reduce the concentration and complexity of the separated substances and improve the efficiency and accuracy of microfiltration.
Membrane post-treatment: Post-treatment after microfiltration (such as ultrafiltration, reverse osmosis, etc.) can further remove small molecules and soluble substances that cannot be retained by microfiltration.

6. Industry-specific requirements
Petrochemical industry: In the petrochemical industry, microfiltration membranes are often used to remove suspended solids and oil pollutants from oily wastewater in oil fields. In order to meet the strict water quality requirements for reinjection water, it is necessary to select microfiltration membranes with high removal efficiency and anti-pollution ability, and strictly control the operating parameters to ensure the filtration accuracy.
Food processing industry: In the food processing industry, microfiltration membranes are often used for clarification and sterilization of products such as juice and dairy products. In order to meet the requirements of food safety standards and product quality, it is necessary to select microfiltration membranes with good hygiene performance and filtration accuracy, and strictly control the cleaning and disinfection process to prevent cross contamination.