Study On Treatment Of Dyestuff Wastewater By Combined Process Using Micro-Electrolysis And Fenton Oxidation

Dyestuff wastewater is a typical kind of biorefractory wastewater with high concentration, high chroma, complicated component and low degradability. Because of this, it would hardly pollute the accepted water and have a bad influence on people's normal life without being treated well. The traditional biological or physical chemistry treatment process can not make the effluent to meet the discharge standard. Thus, it is a difficult for us to solve the problem in industrial wastewater treatment.The process of Micro-electrolysis and Fenton reagent oxidation is characteristic of low investment, low running cost, small occupation of land, simple operating process. It is convenient for biological treatment with having improved the biodegradability of wastewater. In this process the iron is scrap iron or sheet iron from machine factory and activated carbon can be replace by coke and flue powder, so the significance of this process is making use of waste circularly.In this thesis, the object is practical wastewater from a dyestuff chemical plant in Henan. The principle, characteristic, effect factor and application in dye wastewater of Micro-electrolysis and Fenton reagent oxidation is studied. Based on a series of static experiments, the degree of importance of influence factors is determined by orthogonal experiment and the optimal operating parameters are determined by single factor experiment. And then the possibility of connecting micro-electrolysis with Fenton reagent oxidation is demonstrated in theory. At last biological treatment process is determined by comparing the disadvantage with the advantage of biological process and examples of dyestuff wastewater treatment and running cost is simply analyzed.The experiment result of dyestuff wastewater indicates that the optimal operating parameters are as follows:1. Micro-electrolysis: reaction time is 1 hour, pH value is 1-2, volume ratio of iron versus carbon is 1, and the COD removal efficiency is 22%.2. Fenton reagent oxidation: pH value is 3, temperature is 40 Celsius degree, reaction time is 30 minutes, the dosage of hydrogen peroxide and ferrous...