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Related Experiment Videos

Scale formation in NF/RO: mechanism and control.

S Lee1, C H Lee

  • 1Construction Environment Research Department, Korea Institute of Construction Technology, Ilan, Kyunggi-do 411-712, Korea. s-lee@kict.re.kr

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|July 12, 2005
PubMed
Summary

Scale formation hinders nanofiltration (NF) and reverse osmosis (RO) membrane use. A hybrid microfiltration-NF/RO system effectively removes scale crystals, improving performance, especially in spiral wound modules.

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Area of Science:

  • Membrane Science and Technology
  • Water Treatment Technologies
  • Materials Science

Background:

  • Scale formation from soluble salts is a primary limitation for nanofiltration (NF) and reverse osmosis (RO) membrane applications.
  • Understanding scale formation mechanisms is crucial for developing effective control strategies.

Purpose of the Study:

  • To review scale formation mechanisms in NF/RO systems.
  • To evaluate methods for retarding scale formation.
  • To investigate a novel microfiltration-NF/RO hybrid system for scale control.

Main Methods:

  • Identification and investigation of surface and bulk crystallization mechanisms in NF/RO fouling.
  • Analysis of hydrodynamic conditions and module geometry effects on fouling.
  • Evaluation of a microfiltration-NF/RO hybrid system for continuous crystal particle removal.

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Main Results:

  • Two distinct scale formation mechanisms, surface and bulk crystallization, were identified, influenced by operating conditions and module design.
  • Conventional scale control methods offer limited and unpredictable performance.
  • The MF-NF/RO hybrid system demonstrated effectiveness in removing scale crystals, leading to significant flux improvement in spiral wound modules.

Conclusions:

  • The MF-NF/RO hybrid system offers a promising approach for mitigating scale formation in membrane processes, particularly at high permeate recovery rates.
  • Module geometry significantly impacts the effectiveness of the hybrid system, with spiral wound modules showing substantial flux recovery due to dominant bulk crystallization.