Study On Treatment Of Dyeing And Pesticide Wastewater

The characters of industry wastewater were summarized in the paper, such as large flow quantity, high concentration organic, color, toxic, debiodegradation, and so on. Discharged straightly without being treated, this wastewater would pollute environment. The object of experiment is dyeing wastewater and pesticide wastewater, and it gave the pattern of pretreatment- biochemical treatment.The pretreatment included coagulating sedimentation, ozone oxidation, Fenton and electrolysis, and did the comparing experiment. It researched the better pretreatment of different industry wastewater, and study the influence of influencing factors to treatment effect. The dyeing wastewater was treated by CaO coagulating sedimentation- ozone oxidation, CaO coagulating sedimentation-electrolysis and CaO coagulating sedimentation- Fenton, the decolorization rate was 96%, 85% and 82%.Biochemical treatment included hydrolyzation and acidification, aerobic biological processes. Research the treatment effect by mensurating the different phase water quality. After different pretreatments, the wastewater was treated by biochemical treatment seperately. The pretreatment effects were compared by the difference of effluent quality. The optimal technics that treating dyeing wastewater was CaO coagulating sedimentation- hydrolyzation and acidification-aerobic biological processes- ozone oxidation. The total removal rate of COD was 98%, the decolorization rate was 98%, the removal rate of SS was 95%, the removal rate of SO₄^2- was 100%. The effluent met the strictest requirement of effluent standards.Central composite design-response surface methodology was widely used in pharmaceutics. It was used to optimize the parameter of electrolysis processes treating pesticide wastewater, and got excellent effect. At the condition of that voltage was 8 V, the time was 60min, the pH of wastewater was 5, the removal rate of COD was 53%, the decolorization rate was 96%. The mathematics model had optimal forecast, and the windage rate was just 1.9%.