Research On Treatment Of Reactive Red K-2BP Dye Wastewater By Microwave Assisted Oxidation Technology

Dye product is moving toward deep chromaticity, resistance to photolysis, resistance to oxidate and resistance to biodegrade as dye industry development. It is difficult to deal with dye wastewater with the conventional wastewater treatment. Dye wastewater is treated by microwave combined with advanced oxidation technology, it has shown good industrial value and prospect.In this paper, Reactive Red K-2BP dye wastewater treated by MW assisted Fenton oxidation(MW/Fenton) and MW assisted Na2S2O8oxidation (MW/Na2S2O8) was explored. The various influences of these two processes were studied; the COD removal rate at the best experimental condition was determined; the dynamic model of fitting analysis was also discussed. UV-Vis of Reactive Red K-2BP during decolorization was analyzed. Specific conclusions were as follows.(1) Reactive Red K-2BP dye wastewater treated by MW/Fenton was significantly better than that only treated by Fenton or MW, Microwave and Fenton has obvious synergistic effect. When initial concentration was100mg/L, initial pH was3.0, dosage of3%H2O2was0.4mL, concentration of Fe2+was0.08mmol/L, microwave power was460W, reaction time was8min, decolorization rate was94.37%, COD removal rate was73.27%. This reaction was first order kinetics reaction, and reaction kinetics equation was lnC=0.3567+4.5673x. Chromophoric groups, benzene ring and naphthalene ring of Reactive Red K-2BP were destroyed.(2) Reactive Red K-2BP treated by MW/Na2S2Ox was significantly better than that treated only by Na2S2O8or MW, Microwave and Na2S2O8has obvious synergistic effect. When concentration of Reactive Red K-2BP was100mg/L, nature pH, dosage of Na2S2O8was15mg, microwave power was460W, reaction time was8min, decolorization rate of Reactive Red K-2BP was94.37%, COD removal rate was73.27%. This reaction was first order kinetics reaction, reaction kinetics equation was lnC=-0.5784t+4.7504. The mechanism of free radical experiment proved that SO4-played a main role in the reaction. Chromophoric groups, benzene ring and naphthalene ring of Reactive Red K-2BP were could be rapidly degraded.