Study On New Treatment Techniques Of Industral Wastewater Containing Direct Copper Complex Azo Dye

Dyestuffs wastewater is one of the hard-deal industrial wastewater in China. Because it has high organic pollutant content, chromaticity, alkalescence and water quality fluctuation. The quantity of the dyestuffs wastewater is also large. How to dispose the printing wastewater with economical and effective processing technology has become a universal problem concerned of the environmental protection industy today.This article analyzed the dyestuffs production procession, the ingredient, characteristics and harm of the dyestuffs wastewater and introduced each kind of processing method applied in the dyestuffs wastewater treatment.Coagulation sedimentation Fenton oxidation experiments and Internal electrolytical decolorization experiments were conducted to treat the wastewater containing direct copper complex azo dye.we study the function of some flocculation agents including A1₂(SO₄)₃·18H₂O FeSO₄·7H₂O PAM, and found out that FeSO₄·7H₂O is the most effective flocculation. The better reaction conditions of coagulation was determined through experiments. Under the conditions of pH 11.57 ,2 g/L FeSO₄·7H₂O, reaction time 10 min, the color removal efficiency was 80%.In Fenton oxidation experiments, the color removal efficiency reached 90% under the conditions of 0.6 ml/L H₂O₂, 300mg/L FeSO₄·7H₂O, pH 4⁵ and reaction time 30min, better than coagulation sedimentation experiments.Internal electrolytical decolorization experiments were conducted to treat wastewater containing direct copper complex azo dye. According to the orthogonal experiments, the optimal operation conditions were as follows: The ratio of the amount of scrap iron to wastewater was 0.2 g/ml;acidic pH=2;alkaline pH=10, alkaline reaction time=10min.The results showed that the order of the importance of the influencing factors was: amount of scrap iron, acidity, alkalinity, and alkaline reaction time. The UV-Vis spectrogram indicated that the azo dye characteritical peaks disppeared in conclusion that Internal electrolytical decolorization experimentscan destroy azo funtion in order to remove color.From the experinment result, we conclused in the internal electrolytical decolorization experiments it is very useful to separately analysis the acidic pH and alkaline pH. We can reuse the iron also it can deactive.This experiment passes to make use of water pipe to flush the iron, and we use the 0.1N hydrochloric acid to marinate the iron can activated the iron in a certain extent.Internal electrolytical decolorization experiments is not electricity -consuming and very low-cost. It's a resuse of iron scraps from the factory waste, and very convenient for actual operation...