An efficiently sustainable dextran-based flocculant: Synthesis, characterization and flocculation

• A new bio-polysaccharide polymer to separate cationic pollutants was synthesized.
• Dextran optimized by our lab has controlled high molecular weight (10,000 kDa).
• The viscosity of polymer is extremely high.
• This polymer is efficient, heat-resistant and biodegradable to water treatment.
• RSM was applied to optimize the flocculation conditions.

Polysaccharide-modified flocculant is a notable material in the field of wastewater treatment. Synthesis of biopolysaccharide derivatives as eco-friendly flocculants is remarkably desired for environmental protection. This work presents an efficient flocculant synthesized through copolymerization of acrylamide, sodium acrylate (AS), and dextran. Physicochemical properties of the flocculant were evaluated. Process parameters of coal-washing wastewater flocculation were tested using Response Surface Method. The application of graft polymers exhibited efficient flocculation performance at low level of flocculant dosage in alkalescent environment. The improved dextran contributes to handle industrial effluent and sanitary sewage.

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