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How To Prevent Membrane Pollution During Membrane Treatment Of Wastewater Reuse
- Jul 23, 2018 -

How to prevent membrane pollution during membrane treatment of wastewater reuse

Membrane fouling means that particles, colloidal particles or solute macromolecules in the liquid contact with the membrane cause adsorption or deposition of the substance on the membrane surface or pores of the membrane due to physical, chemical or biological interaction with the membrane, resulting in a decrease in membrane pore size or Blockage, a phenomenon in which the membrane flux is reduced and the separation performance is lowered. Since membrane fouling limits the membrane permeation flux, the membrane life and membrane separation efficiency are reduced, which seriously restricts the application and development of membrane technology. Therefore, research on membrane fouling during membrane treatment of wastewater has been receiving much attention.

To prevent and control membrane fouling, it is first necessary to understand the filtration mechanism of various membrane processes. In general, the micro/ultrafiltration process mainly follows the screening mechanism, and the reverse osmosis process follows the dissolution-diffusion mechanism. Correspondingly, the pollution of the reverse osmosis membrane is generally membrane fouling, and the contamination of the micro/ultrafiltration membrane is generally membrane fouling caused by surface gel layer contamination and pore adsorption and pore plugging. Surface contamination is generally reversible membrane fouling, while plugging and adsorption in pores is generally irreversible membrane fouling.