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Methods for Cleaning and Protecting Hollow Fiber Ultrafiltration Membranes
As a wastewater treatment device, hollow-fiber ultrafiltration membranes gradually develop a gel layer and accumulate deposits of air pollutants during prolonged operation. To ensure the longevity of these membranes, regular cleaning is essential. Here are several cleaning methods:
As a wastewater treatment device, hollow-fiber ultrafiltration membranes gradually develop a gel layer and accumulate deposits of air pollutants during prolonged operation. To ensure the longevity of these membranes, regular cleaning is essential. Here are several cleaning methods:
2020-05-20
Hollow-fiber ultrafiltration membrane As wastewater treatment machinery and equipment, they gradually develop gel-like layers and accumulations of air pollutants over prolonged operation. To ensure Hollow-fiber ultrafiltration membrane The usage period requires timely cleaning. Here are several cleaning methods:
Organic chemistry approach:
1. Alkaline Washing Method: Common alkaline solutions include sodium hydroxide solution, ferric chloride solution, and dilute hydrochloric acid. The pH of the prepared alkaline solution also varies depending on the type of membrane material—while CA membranes are typically maintained at a pH around 8, corrosion-resistant membranes require a pH of up to 12. Both methods involve circulating the solution using a centrifugal pump or immersing the membrane for 0.5 to 1 hour, effectively removing organic residues and vegetable oils.
2. Use a mixed cleaning agent consisting of sodium fluoride and a base, sodium fluoride combined with an acid, or a mixture of sodium fluoride and sodium fluoride itself for cleaning;
3. Use a surfactant or solvent-based cleaner for cleaning.
Physical methods:
Isobaric Hydroelectric Cleaning Method: Targeting Hollow-fiber ultrafiltration membrane The isobaric cleaning method is one practical and viable approach. Specifically, this involves closing the inlet and outlet gate valves for the hyperfiltrate while fully opening the extraction water inlet and outlet valves. As a result, the pressure inside and outside the hollow-fiber ultrafiltration membrane gradually equalizes. This pressure difference causes contaminants adhering to the membrane surface to loosen and detach, allowing the increased flow rate to effectively flush away these residues—particularly the softer, more easily removable debris—from the membrane’s outer layer.
Guarantee Law:
No applicable Hollow-fiber ultrafiltration membrane It needs to be immersed in maintenance fluid and then stored in a sealed container to prevent the soaked membrane from drying out, shrinking, and ultimately damaging its structure—leading to a reduction in water flow. For membranes that have remained unused for an extended period (over 10 days), Hollow-fiber ultrafiltration membrane First, perform a sterilizing backwash on it, and then introduce the maintenance solution into the ultrafiltration system before sealing it for storage.
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