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Related Concept Videos

Dialysis01:15

Dialysis

2.0K
Dialysis is a diffusion-based purification process that separates analyte molecules from a complex matrix. This is accomplished by allowing molecules in the solution to pass through a semipermeable membrane into a liquid on the other side. The membrane is usually made of cellulose acetate or cellulose nitrate, and the second liquid must be miscible with the solution. Ions (e.g., chloride or sodium) or organic molecules (e.g., glucose) can pass through the membrane pores, which generally have...
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Capillary Electrophoresis: Applications01:30

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Ion-Exchange Membranes for the Fabrication of Reverse Electrodialysis Device
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Predicting scale formation during electrodialytic nutrient recovery.

Emma Thompson Brewster1, Andrew J Ward1, Chirag M Mehta1

  • 1Advanced Water Management Centre, The University of Queensland, St Lucia, QLD 4072, Australia.

Water Research
|December 23, 2016
PubMed
Summary

Electro-concentration of nutrients from wastewater shows promise for resource recovery. Combining struvite recovery and pH control significantly reduces inorganic scale formation on membranes by up to 87%.

Keywords:
Electro-chemistryElectrodialysisMembrane scalingModellingNutrient recoveryPhysico-chemistry

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Area of Science:

  • Environmental Engineering
  • Water Treatment Technologies
  • Resource Recovery

Background:

  • Inorganic scale formation on cation exchange membranes is a major operational challenge in electro-concentration of wastewater nutrients.
  • Anaerobic digester rejection water often contains calcium, magnesium, phosphorus, and carbonate, exacerbating scaling issues.
  • Effective nutrient recovery requires addressing these scaling concerns to ensure process viability.

Purpose of the Study:

  • To evaluate the effectiveness of different pre-treatment strategies on reducing inorganic scale during electrodialytic nutrient recovery.
  • To investigate the impact of struvite recovery and controlled pH on membrane scaling.
  • To validate a mechanistic model for predicting and mitigating inorganic precipitation.

Main Methods:

  • Laboratory-scale electro-concentration experiments were conducted on anaerobic digester rejection water.
  • Three treatments were compared: no pre-treatment (A), post-struvite recovery (B), and post-struvite recovery with pH 5 concentrate control (C).
  • Scale formation was quantified, and a mechanistic precipitation model was validated against experimental data.

Main Results:

  • Treatment A (no pre-treatment) resulted in significant scale formation.
  • Treatment B (struvite recovery) reduced scale by lowering magnesium phosphates.
  • Treatment C (struvite recovery + pH 5 control) further reduced scale by limiting calcium carbonate precipitation, achieving an 87% reduction compared to A.
  • The mechanistic model accurately predicted scale reduction based on phosphate removal and carbonate stripping.

Conclusions:

  • A combination of struvite recovery and controlled pH is highly effective in mitigating inorganic scale during electrodialytic nutrient recovery.
  • Pre-treatment strategies are crucial for overcoming operational challenges in wastewater nutrient recovery.
  • Mechanistic models can aid in designing integrated approaches for scale control and resource recovery.