Research On Treatment Of Printing And Dyeing Wastewater By Iron-carbon Micro-electrolysis

Printing and dyeing wastewater is a big one in our country wastewater,It’scharacteristics include large emissions, high concentration of organic compounds,compounds complex refractory, high chromaticity and poor biodegradability，and so on. In the process of actual processing, usually takes the way of"physicochemical+biochemical" for processing.The process isn’t a ideal onebecause of its high operating cost more process and the poor treatment effect,it isdifficult to achieve effluent discharge standards. Therefore, the study of newprinting and dyeing wastewater treatment methods and determine the optimumprocessing conditions, it played an important role in environmental protection isnow focused on research issues must be considered.The paper using technology that printing and dyeing wastewater treatmentby iron-carbon micro-electrolysis method.The main conclusions are as follows：（1）Through single factor analysis results analysis,the iron-carbonmicro-electrolysis treatment of printing and dyeing wastewater for optimumreaction conditions are：pH value was4,the mass ratio of iron-carbon was1：1,scrap iron dosing quantity is12g/L,and the reaction time for60minutes. Theremoval rate of COD in wastewater reached76.3%, the removal rate of chromareached99.6%.（2）The orthogonal test results show that in the experimental study ofiron-carbon micro-electrolysis treatment of printing and dyeing wastewater. Theorder of importance of each factor is the impact of COD removal are：pH, irondosage, iron-carbon mass ratio and reaction time.（3）By comparing the experimental design,Verify the mechanism ofmicro-electrolysis are：flocculation and sedimentation, redox, other effects ofsynergy adsorption.（4）On the micro electrolysis treatment to dyeing and printing wastewater,which can improve the l biodegradability from0.12to0.12.