Experimental Study On Azo Dyes Wastewater By Electro Flocculation Floating

With the rapid development of dyestuff industry,the number and the variety of dyestuffhas increased day by day. The environment pollution taken by dye wastewater has stepped upin the meanwhile. Azo dyes constitute the largest and the most important class of commercialdyes. Azo dyes wastewater is not only high chromatic,strong noxious, but also difficult todegrade and easy to discompose to carcinogenic aromatic amine under deoxidizationcondition. So,azo dyes wastewater must be treated urgently.In this thesis,methyl orange as the research object,which has zao dyes structure,wastreatmented by electricflocculation. The experiments use homemade experimental device,through the main factors electrolysis of the orthogonal design (electrolytic voltage,supporting electrolyte concentration,pH and electrolysis time) on degradation rate of CODand decolorization ratio.From the results of experimental,the influence of each factor on degradation rate ofCOD:electrolysis voltage > supporting electrolyte concentration > pHï¼›the influence of eachfactor on degradation rate of of decolorization ratio:electrolysis voltage > electrolytic time >supporting electrolyte concentration > pH.Preliminary sure electricity flocculation methyl orange air-float technology processingdye wastewater optimized conditions for: electrolytic voltage for 15Vï¼›Electrolysis time is5minï¼›supporting electrolyte concentration is 8g/Lï¼›pH is 5. In these conditions:thedegradation rate of COD is 81.76%,the degradation rate of of decolorization ratio is 98.2%.At the same time,the use of the UV-Vis spectrophotometer,before and after processingof methyl orange solution,through to the UV-Vis spectrum reflect the structural changes,toeffect a preliminary analysis and evaluation.