Treating Reactive Brilliant Red X-3B Wastewater By Ternary Internal-electrolysis System

The textile pringting and dyeing industy is one of the most important industy department in our country,the printing and dyeing wastewater which is discharged by textile pringting and dyeing industy is about 1/10 of the total industrial discharges.Theprinting and dyeing wastewateris one of theindusty wastewater which is difficult to degrade,because it has characteristics of high concentration of organic substance,high alkalinity,deep chroma,variation of water and weak biochemical treatability.There are so many kinds of azo dyes and widely used reactive dyes in textile pringting and dyeing industy.It is extremely important to find a new processed method with high efficency,low energy consumption,low cost.The internal-electrolysis which is a special electrochemical method based on mechanism of galvanic cell.It can formed potential difference without additional power electrochemical.The internal-electrolysis hascharacteristics of high efficency,low energy consumption,low cost and it is a new method which is full of prospects to treat azo dyes wastewater.This study choose a representative azo dyes——reactive brilliant red X-3B as research object.Based on the traditional Fe/C internal-electrolysis,the degradation process of ternary internal-electrolysisstirring system and ternary internal-electrolysis aeration system,which is constituted by adding the third material Ni,on treating dyeing wastewater has been investigated.The influence of these influence fators which include the mass ratio of padding,the initial pH of wastewater,the aerationstyle,the dye concentration,the composition of anionic or cationic and so on also has been investigated.The experimental results showed that:(1)For ternary internal-electrolysisstirring system:In 120 min reaction time,the 97.2% of degradation rate of ternary internal-electrolysis system is better than the 91.6% of degradation rateof binaryinternal-electrolysis on the constant temperature and stirringcondition which include that the mass ratio is mFe:mNi:mC=1:1:1,the initial concentration of X-3B is 50mg/L,the initial pH is 4,the temperature is 20℃.(2)For ternary internal-electrolysisaeration system:the mass ratio ismFe:mNi:mC=3:2:4, the initial pH is 4, the aeration amount is 60L/h,the degradation rate of reactive brilliant red X-3B reach 87.2% and the degradation rate of TOC is 63.5% within 270 min reaction time.(3)From the the perspective of the efficiency of reaction,the two kinds of ternaryinternal-electrolysissystem arebetter than their corresponding binary internal-electrolysissystem.Through comparing the reaction time of two kinds of ternary internal-electrolysissystem,the ternary internal-electrolysisstirring system is conductive to degradation of reactive brilliant red X-3B.Probable degradation pathway of reactive brilliant red X-3B in ternary internal micro-electrolysis stirring system:Firstly,The chromophore of reactive brilliant red X-3B is broken at the initial reaction time.Secondly,the macromolecular stucture is degraded as colorless and small-molecule intermediate products.In the end,some ions and the small-molecule products are produced by these intermediate products,achieving the purpose of degradation.