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06
2022
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05
Several methods for fouling of industrial wastewater nanofiltration membranes
Author：
The application of industrial wastewater nanofiltration membranes in various water treatment processes. To ensure the stable performance of industrial wastewater nanofiltration membranes, preventing scaling is an effective method. So, what are some methods to prevent scaling of industrial wastewater nanofiltration membranes?
1. Perform proper pretreatment of the raw water, paying attention to the compliance of pollution indexes, and perform sterilization to prevent microbial growth within the equipment.
2. Maintain appropriate operating pressure during the operation of the reverse osmosis equipment. Generally, increasing the pressure will increase the water yield, but excessive pressure will compact the membrane.
3. Maintain turbulent flow on the brine side during the operation of the reverse osmosis equipment to reduce concentration polarization of the solution on the membrane surface and prevent the precipitation of certain sparingly soluble salts on the membrane surface.
4. During short-term shutdown of the reverse osmosis equipment, chemical cleaning should be performed; for long-term shutdown, formaldehyde protection should be added.
5. When the water yield of the reverse osmosis equipment is significantly reduced, indicating membrane scaling or fouling, chemical cleaning should be performed.
Industrial wastewater nanofiltration membrane
6. Design sufficient cross-flow velocity and concentrate flow velocity.
7. Standardize the operating data.
Preventing membrane scaling and performing proper membrane maintenance are reliable protections for membrane performance. Users should understand these operating methods during the use of industrial wastewater nanofiltration membranes to ensure that the industrial wastewater nanofiltration membranes are in working condition and effectively extend their service life.
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