Composite number

Psychiatry

Engineering

Flocculation

Psychology

Copolymer

Composite material

Textile

Organic chemistry

Chemistry

Polymer chemistry

Materials science

Coagulation

Polyacrylamide

Acrylamide

Ammonium chloride

Ferric

Chemical engineering

Polymer

Pulp and paper industry

Starch

Waste management

Wastewater

Separation and Purification Technology

Inorganic/organic composite coagulants have received wide attention in recent years due to their outstanding properties in wastewater treatment. However, non-biodegradable synthetic polymers are largely applied as the organic components of these composites, leading to negative environmental impacts. To acquire efficient composite coagulant with less environmental risks, a novel inorganic/natural polymer composite PAFC-Starch-g-p(AM-DMDAAC) (polyaluminum ferric chloride-starch graft copolymer with acrylamide and dimethyl diallyl ammonium chloride) was prepared, and applied for textile wastewater treatment. The results showed that PAFC-Starch-g-p(AM-DMDAAC) exhibited higher and more stable dye removal efficiencies than other prepared composite coagulants. For synthetic textile wastewater treatment, PAFC-Starch-g-p(AM-DMDAAC) could reduce the chemical dosage by more than 50% compared with conventional coagulation-flocculation process. The effects of wastewater pH, conductivity and temperature on the coagulation performance were studied. High-temperature accelerated storage test proved that PAFC-Starch-g-p(AM-DMDAAC) had a strong storage stability. PAFC-Starch-g-p(AM-DMDAAC) is an eco-friendly composite coagulant with excellent performances and broad utilization range, showing promising application prospects.

Preparation and performance of a novel starch-based inorganic/organic composite coagulant for textile wastewater treatment