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Abstract
The goal of the paper was to prepare a class of flocculants by free-radical copolymerization of acrylamide with acrylic acid in aqueous solutions in the presence/absence of potassium persulphate as initiator. Reaction medium was submitted to electron beam treatment of 0.6 to 1.5 kGy in atmospheric conditions and at room temperature. Because of the complexity of reaction mechanisms involved in radio-induced polymerization, was necessary to establish the connection between absorbed dose and initiator concentration, both of them very important in free radical production. Unlike the conversion coefficient and residual monomer concentration, intrinsic viscosity and Huggin’s constant are sensitive to the initiator concentration variation for all used irradiation doses. The copolymerization was confirmed by FTIR measurements. The flocculation characteristics were evaluated in 0.2 wt % kaolin suspension at room temperature using different polymer dosages between 0 to 10 ppm. High flocculation efficiency was obtained using the polymer having high values of intrinsic viscosity, molecular weight and radius of gyration.
Highlights
Pure water is an essential requirement for the survival of human beings
The characteristics of poly(acrylamide-co-acrylic acid) flocculants are influenced by the following factors: chemical composition of the solutions to be irradiated and absorbed dose level[28,29,30]
The flocculation tests were performed at different polymer dosages, which varied from 0 to 10 ppm at the measured pH of 7
Summary
To meet the requirements of potable, industrial and agricultural water, the immediate need is to treat wastewater, which contains both dissolved and suspended particles. These effluents are highly undesirable and unsafe. Coagulation has been defined as the addition of a positively charged ion of metal salt or catalytic polyelectrolyte that results in particle destabilization and charge neutralization. If colloid particles or ions of positive electric charge are added it neutralizes the electric negative charge. Flocculation refers to the successful collision that occurs when destabilized particles are driven toward each other by the hydraulic shear force in the rapid
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