| In recent years,with the development of economy,various types of sewage discharge in China have been increasing year by year,and environmental pollution caused by the discharge of oily wastewater cannot be underestimated.Flocculation and sedimentation method is an important approach to the treatment of oily wastewater,while traditional flocculants can not achieve good results in the treatment of oily wastewater.In response to this problem,a template-polymerization technique was used to synthesize a hydrophobic associative cationic polyacrylamide flocculant P(AM-DMC-LA)with micro-block structure,which was used to remove turbidity and oil in water.The effect of each reaction condition on the intrinsic viscosity and conversion rate of the polymerization product was investigated by single factor experiments.The optimized preparation conditions were as follows: total monomer mass fraction=40%,pH=4,m(DMC)=25%,m(LA)=2.0%,m(urea)=0.3%,m(v-044)=0.06%,and illumination time = 60 min;The influence of the four factors on the order of primary and secondary interactions and their interactions were investigated by response surface experiments and prepared under optimized conditions.The intrinsic viscosity of P(AM-DMC-LA)can reach up to 14.2dL/g.The characterization analysis shows that the polymerization reaction occurs successfully,and the polymerization product is a hydrophobic associative cationic polyacrylamide P(AM-DMC-LA)with a micro-block structure.;Apparent viscosity analysis experiments show that P(AM-DMC-LA)has obvious hydrophobic association property,and the copolymer with micro-block structure has better association;through oily wastewater The flocculation experiment showed that the flocculation performance of P(AM-DMC-LA)treated oily wastewater was better.The study of the flocculation mechanism showed that the synergy of adsorption neutralization,adsorption bridging and hydrophobic association plays an important role in the treatment of oily wastewater. |
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