Study On Treatment Technology Of Dyestuffs Wastewater

Dyestuffs wastewater has many characteristics, more material difficult to degradate, complicated organic matter, high density, heave toxicity and so on. At present, the general way is biochemical treatment. But it is difficult to get rid of chromaticity and CODcr and is easy to make the second pollution.This paper has explored some new-type treatment technologies. During pretreatment, we study the function of some flocculation agents including PAC, PAM and bleaching agent. By the respective function of those flocculation agents and the expulsion percents of chromaticity and CODcr, we get the best concentration of flocculation agents. Then we use the combination of PAC/PAM and PAC/bleaching agent, and get the best combination way. The combination of flocculation agents saves the quantity of flocculation agents and improves the treatment results.During treatment of micro-electrolysis, TiO2-photocatalysis, and ultrasonic wave degredation, expulsion percents of chromaticity and CODcr are used as the standard of treatment result. To micro-electrolysis, we study the effect of reaction time, intaking water's pH and ratio of Fe and C. To TiO2-photocatalysis, we study the effect of reaction time, reaction temperature and quantity of catalyst (TiO2). To ultrasonic wave degredation, we study the effect of different beginning CODcr, reaction temperature, intaking water's pH, and reaction time. Finally we get the best technological condition of those technologies.Thinking about those best technological conditions, we choose a better combination treatment technology flocculation- TiO2-photocatalysis.