The Research Of Organic Wastewater Degraded By Potassium Ferrate

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 and anthraquinone dyes constitute the largest and the mostimportant class of commercial dyes. Because of its high chromaticity, strong toxicity anddifficult degradation, traditional techniques such as adsorption, flocculation, biologicaloxidation can be generally used inefficiently to remove dyes from dye wastewater. Potassiumferrate which is a multi-function water treatment agent with the novel properties of oxidation,flocculation, disinfection and deodorization is arousing more and more widespread interest ofresearchers. This article researched the degradation of azo dyes and anthraquinone dyes bypotassium ferrate, which extends the application of potassium ferrate in wastewater treatmentand is meaningful to the treatment of printing and dyeing wastewater.In this article, potassium ferrate was used to degrade reactive red2BF which had azodye structure and reactive brilliant blue KN-R which had anthraquinone dye structure. We usethe decolorization rate of dye wastewater, removal ration of COD, removal ration of TOC andthe structure change reflected by UV-visible absorption spectrum to evaluate the disposaleffect of azo dyes and anthraquinone dyes by potassium ferrate. We systemically studied thetechnical condition of this method which effected the disposal of dyes. The result indicatedthat the dosage of potassium ferrate, pH of the initial solution, the time of reaction and theinitial concentration of dye exerted great effect on the degradation. When the initialconcentration of reactive red2BF was100mg/L, the pH was4.0, the dosage of potassiumferrate was1.0g/L, the decolorization rate and the removal ration of COD attained99.8%and71.3%after20min, respectively. When the initial concentration of reactive brilliant blueKN-R was20mg/L, the pH was4.0, the dosage of potassium ferrate was1.0g/L, thedecolorization rate and the removal ration of COD attained99.5%and76.8%after10min,respectively.We also discussed the reaction kinetic equation of potassium ferrate and reactive brilliantblue KN-R. The reaction that potassium ferrate oxidize reactive brilliant blue KN-R is1.18 grade. Apparent kinetic equation is V=0.1259X0.297Y0.878.