Uv/naclo < Sub > 2 < / Sub > Method Of Three Kinds Of Reactive Dyes Wastewater Treatment Research

This article studied UV/NaClO₂system to generate ClO₂, And investigated that thefactors of pH, UV light intensity, reaction time, and chlorite to affect the ClO₂formationresults. Under the conditions of the chlorite solution of200mg·L-1,0.6mW·cm-2intensity,15min reaction can be completely.UV/NaClO₂production of ClO₂by the pHvalue has little effect, breaking the traditional acidification ClO₂in strong acidicconditions, restrictions, and broaden the pH of ClO₂generated. It has great significancefor the promotion and application of ClO₂process. Process procedures and （equipment）device reactants NaClO₂solution and the reaction can be ceased at any time by stoppingthe UV irradiation.we have adopted in the liquid phase UV/NaClO₂continuous generate ClO₂, whiletreatment of dye wastewater, rather than the traditional one-time dosing highconcentrations of ClO₂as easy disproportionation reaction ClO₂generation process, thisprocess eliminates the need to reduce the cost of water treatment, UV decolorization ofdye wastewater has a strong reaction of·OH to grow into increased pollutants removalcapacity.This article selected reactive red KE-3B, reactive blue KN-R,reactive yellow X-RGthree reactive dyes as decolorization objects in the UV and UV/NaClO₂system.UV treatment the effect of three kinds of dyes, respectively, to examine the systemof different pH, UV intensity,and reaction time on the decolorization effect.Weaklyalkaline at pH8, light intensity0.6mW·cm-2, reaction time60min for the processing ofthe simple structure of the reactive yellow X-RG decolorization rate can reach about63%.However, the simple structure, solubility relative activity of yellow less reactiveblue KN-R decolorization only about25%, indicating that the solubility of UVtreatment of dye impact is huge, and for the complex structure of reactive red KE-3Bcan only reach14percent. In the inspection UV/NaClO₂system to deal with three kindsof dyes,The decolorization rate of UV/NaClO₂system is higher than the UVdecolorization rate in the NaClO₂dosage of200mg·L-1, light intensity for0.6mW·cm-2, reaction time was30min, reactive yellow X-RG decolorization rate could be achieved92%, reactive blue KN-R decolorization could be achieved above85%for the complexstructure of reactive red of KE-3B decolorization rate can reach more than50%.UV/NaClO₂system dye under alkaline conditions better under acidic conditions,least effective under neutral condition. pH range widely,to solve the ClO₂difficult todeal with the problem of alkaline wastewater.This paper studied the reaction kinetics of UV/NaClO₂system to deal with threekinds of dyes: the reaction of the dye wastewater of UV/NaClO₂system is series offirst-order kinetics.Size and decolorization rate of the different conditions of the kineticconstants of K consistent with the order of the specific kinetic constants for thepH10>pH4≥pH8>pH6.For the complex structure of pairs of the azo dye the decolorization effect ofreactive red of KE-3B is not satisfactory, in order to shorten the reaction time, the papersynthesized with Meso-5,10,15,20-Four（3,4,5-trimethoxyphenyl） manganese porphyrincatalyzed NaClO₂generation of ClO₂, and studied the optimum synthesis conditions ofmanganese porphyrin catalyst.UV/NaClO₂/Mn（TTOMPP） system decolorizationexperimental results to the KE-3B, for example,60min when the pH4,pH6and pH8the decolorization rate increased from70%to82.3%,59.6%to75%and71%to74.5%.decolorization rate did not increase at pH10.