Applied Research Of Electrchemical Methods Of Treating Refractory Dyeing Wastewater

Textile industry, one of the traditional core industries, develops rapidly in recentdecades, and has made remarkable achievements. As an important part of the textileindustry, printing discharges large quantities of industrial wastewater, the majority ofwhich is not treated effectively, thus posing a great environmental hazard. In recentyears, with the development of new chemical&blended fabric and the progress offinishing technology in printing and dyeing, a large number of bio-refractory organiccompounds like new additives are poured into the dyeing wastewater, making itstreatment more difficult. Therefore, the traditional treatment process has beenseriously challenged.Electrochemistry、 electrochemical combined with aerobic and anaerobicbiological process was used in this paper, based on which a new treatment technologyfor printing and dyeing wastewater was put forward. Main contents and theconclusions are as follows:(1) The influence factor and the corresponding optimal processing conditions ofthe electrochemical oxidation, iron-carbon micro-electrolysis method and a treatmentmethod with a new type of micro-electrolytic material for treating dyeing wastewaterwere studied and determined. The results showed that:①during the process ofdyeing wastewater treatment with electrochemical oxidation method(titanium-basedlead dioxide as anode electrode material, cylindrical iron as cathode), the mostimportant influencing factor is the pH value of the wastewater, followed by thedosage of electrolyte, treatment time and current density, in addition to electrodespace and the aeration. When the printing and dyeing wastewater was treated in theoptimal operating conditions, the COD and color removal rates reached50.3%and70%respectively;②When treating printing and dyeing wastewater by iron-carbonmicro-electrolysis, main influencing factors are: pH, treatment time, the aeration,iron-carbon ratio, the dosage of iron. When dyeing wastewater was treated in optimalprocessing conditions, the COD and color removal rates reached51.5%and75% respectively;③In the process of dyeing wastewater treatment by using newmicro-electrolysis materials, the most important factor is the aeration, followed by pH,reaction time as well as dosing concentration of micro-electrolytic material. Inoptimal operation conditions, better treatment effect would be achieved at roomtemperature, and the COD and color removal rates reached81.1%and91.7%.(2) Based on three electrochemistry methods referred above, by use of built-inmicro-electrolysis material combined with aerobic and anaerobic technology,researches on the treatment of dying wastewater was studied. After adding built-inmicro-electrolysis reaction device in the upper part of the anaerobic reactor, thetreatment effect was greatly improved. When the hydraulic retention time is12h, theCOD removal rate stabilized above75%, color removal above90%; when the effluentof built-in micro-electrolysis anaerobic reactor devices was treated by a built-inmicro-electrolysis aerobic reactor, the final effluent was clear enough, and the CODmaintained at100mg/L, which can stably reach the national first discharge standard.(GB8978-1996)...