Summary Dyeing wastewater dosing supernatant floating out of the dark red smoke situation analysis Summary dyeing wastewater after the supernatant drowned dark red smoke situation Analysis of a textile mill in the printing process will produce red sometimes black printing and dyeing water, raw water PH = 8, the current treatment with ferrous coagulation, PH transferred to 10, plus polyacrylamide just precipitation, the supernatant immediately floating out of a dark smoky light red. No matter how much ferrous dosage, will appear this phenomenon. So it is very likely that the color of ferrous anti-color precipitation. It is understood that, because the factory used a kind of anti-ferrous can prevent the anti-color agents, and the dosage is sufficient circumstances, or the phenomenon. In the previous use of this agent with ferrous processing wastewater treatment pigmentation sufficient amount of circumstances do not appear this phenomenon. In addition to the above description, the factory also had respectively hydrogen peroxide oxidation, drift oxidation, activated carbon adsorption, organic bleaching agent with PAC coagulation decolorization and other methods. But the effect is not ideal, the best effect is ferrous, the supernatant will have more dark red, but the color should also be about 80 times. How to deal with it? In fact, for this type of printing and dyeing wastewater, Fenton or ozone can be taken as a small test, there is also called immobilized laccase agents, 10 ~ 70mg / L fluorescent pink dye decolorization rate can reach 90% or more, the degradation rate Reached 70%, obvious degradation effect, and immobilized laccase can be reused. For more information on wastewater treatment please pay attention to the official website: http: //www.gyzhenyu.com