Preliminary Research On The Flocculation Performance And Mechanism Of The Simulated Dye Wastewater Treated By P(DMC-AM)

In this paper,the study on the flocculation decolorization efficiency of cationic using copolymer P(DMC-AM)to treat of the simulated dyeing wastewater composed of single component reactive,disperse or direct dye,and their mechanism analysis were carried out by using flocculation method.The flocculation decolorization tests on the simulated dyeing wastewater composed of the single component reactive,disperse or direct dye were completed by using P(DMC-AM)flocculants with the serial cationic degrees and intrinsic viscosities.The decolorization rate and CODMn removal rates were regarded as the indexes to investigate the effects of the dosage,cationic degree and intrinsic viscosity of flocculant and the property of dye on the flocculation decolorization efficiencies.The flocculation mechanism was preliminary analyzed by testing Zeta potential and floc form.Through optimizing the experimental conditions of test,the best decolorization rates of using P(DMC-AM)to treat the simulated dyeing wastewater composed of 3 types of single component dyes were obtained.And the knowledge of flocculation performance of P(DMC-AM)was acquired by comparing with other flocculants.In addition,the flocculation decolorization tests of 8 kinds of simulated dyeing wastewater of double component dyes were completed,and the effects of the dosage of flocculant,the property,kind,and concentration of dye on the decolorization rate were studied.The results showed that(1)When the dosage of P(DMC-AM)were between 20 to 60mg/L,the bigger the cationic degree(30%?90%),the higher the intrinsic viscosity(7.20?15.50dL/g),the better the flocculation decolorization efficiencies of P(DMC-AM)treating simulated dyeing wastewater of single component reactive or direct dye,the bigger the cationic degree(30%-90%)and the lower the intrinsic viscosity(7.20-15.50dL/g)were,the better the flocculation decolorization efficiency of P(DMC-AM)treating simulated dyeing wastewater of single component disperse dye was.The more the number(1?5)of sulfonic groups in a molecule of reactive or direct dye was,or the bigger the relative molecular weight of reactive or direct dye was,the better the flocculation decolorization efficiency of P(DMC-AM)was.The relative molecular weight of disperse dye had no obvious effect on the flocculation decolorization efficiency of P(DMC-AM).The analysis of Zeta potential and floc size showed that P(DMC-AM)could form flocs with dyes through electrical neutralization and adsorption bridging.P(DMC-AM)had the better flocculation performance on the simulated dyeing wastewater composed of single component reactive,disperse or direct dye,and the dosages of P(DMC-AM)were much less than that of inorganic flocculants.(2)When P(DMC-AM)was used to treat the simulated dyeing wastewater composed of double component dyes,the experimental results showed that the bigger the concentration of dye was,the more sulfonic groups dye had,the bigger the relative molecular weight of a kind of dye,or/and the denser the sulfonic group arranged in a molecule was,the higher the removal rate of P(DMC-AM)under the same conditions was.The above experimental results have improved the research on application of P(DMC-AM)in dying wastewater treatment.Meanwhile,it also has provided some basic data for the studies on the treatment of simulated dyeing wastewater of double-component and multi-component dyes.