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Dextran derivatives application as flocculants.

Luminita Ghimici1, Marieta Nichifor1

  • 1"Petru Poni" Institute of Macromolecular Chemistry, Aleea Grigore Ghica Voda, 41A, 700487 Iasi, Romania, Romania.

Carbohydrate Polymers
|April 10, 2018
PubMed
Summary
This summary is machine-generated.

Dextran-based polyelectrolytes effectively coagulate and flocculate inorganic and organic contaminants in wastewater. Their performance depends on polyelectrolyte properties and contaminant characteristics, optimizing separation efficiency.

Keywords:
CoagulationContaminantsDextran derivativesFlocculationWastewater treatment

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Area of Science:

  • Environmental Science
  • Polymer Chemistry
  • Water Treatment

Background:

  • Dextran-based polyelectrolytes are explored for wastewater treatment.
  • Cationic and anionic derivatives were synthesized and characterized.
  • Model wastewater systems with inorganic and organic contaminants were used.

Purpose of the Study:

  • To review the effectiveness of dextran derivatives as coagulants and flocculants.
  • To investigate the influence of polyelectrolyte and system properties on separation efficiency.
  • To understand flocculation mechanisms and optimize contaminant removal.

Main Methods:

  • Synthesis of cationic (quaternary ammonium, imidazolium) and anionic (phosphate, carboxylate) dextran derivatives.
  • Testing in model wastewater containing inorganic (e.g., clay, metal oxides) and organic (pesticides) contaminants.
  • Analysis of factors including polyelectrolyte charge density, molecular mass, dose, and system pH.
  • Characterization using turbidity, zeta potential, and particle size measurements.

Main Results:

  • Dextran derivatives demonstrated significant coagulating and flocculating capabilities.
  • Maximum separation efficiency was achieved at specific polyelectrolyte doses.
  • Flocculation mechanisms, floc size, and distribution were determined for various systems.
  • Performance was influenced by polyelectrolyte structure and contaminant properties.

Conclusions:

  • Dextran-based polyelectrolytes are versatile agents for removing diverse contaminants in wastewater.
  • Optimizing polyelectrolyte characteristics and treatment conditions enhances separation efficiency.
  • Understanding the interplay between polyelectrolytes and contaminants is crucial for effective water treatment.