Study On Treatment Of Dyneing Wastewater With Flocculation And Electrolysis

The rapid development of industrial dyes dye generated in the process of production printing and dyeing wastewater treatment of industrial wastewater has become one of the key issues. Printing and dyeing wastewater production, pollution a wide range of high concentration of color, and because of the different production processes, often contain complex refractory toxic and harmful substances. Today's treatment methods are:chemical method, flocculation, chemical oxidation and biochemical method.By flocculation treatment is compared to all the processing methods into the low, easy to operate and handle a large amount of processing. Divided into inorganic flocculants and flocculant organic flocculant. Where inorganic flocculants due to low cost, simple process to become an important means of industrial wastewater treatment, the traditional inorganic flocculants, ferric and aluminum salts can be divided into two series, the present treatment process is generally used agent in both the research base developed on the new water treatment inorganic polymer flocculant. Flocculants used in this study as belonging to such, it has a better than the traditional inorganic coagulant properties of adsorption and flocculation. And this will help with the bleaching agent and coagulant into the processing system, in simple terms, the three work together, significantly enhance the effectiveness of wastewater treatment, flocculation effect, and also significantly reduce the wastewater color degree and COD values. Flocculant confirmed by experiments, bleaching agent and coagulant dose and type of the combined treatment of dyeing wastewater by three water samples a preliminary study and explore.Electrochemical processing is a study in recent years, popular, research shows that the electrochemical method can remove heavy metals in water, and on the COD and color also have good result. This method covers equipment, small, easy management, and no secondary pollution. Electrolysis wastewater treatment method according to the different electrode reactions can be divided into electro-coagulation of electrical and electro-catalytic oxidation floating. Electrocatalytic oxidation for the treatment of refractory organic matter with good results, a necessary condition for the electrode catalyst is a high oxygen evolution overpotential, anodic oxidation characteristics determine the extent of the ways and conduct. Thus, different electrode materials selection is a key factor in the efficiency of electrolysis.In this paper, prepared by electrodeposition of lead dioxide electrode of titanium production process, through the electrolytic method of flocculation after coagulation pretreatment of dyeing wastewater, through which waste water treatment of color and CODCr removal, described This method is well worth the catalytic electrodes. In this study, obtained by this method in order to better apply the electrode printing and dyeing wastewater treatment, waste water into the water by changing the concentration, voltage strength, electrolysis time, pH value and the plate distance and other conditions, measurement of dyeing wastewater treatment process electrolytic the CODcr and color change to study the titanium dioxide electrode lead the practicality of printing and dyeing wastewater treatment, and draw treatment conclusions. Treatment of dyeing wastewater from the costs and other considerations the life of the electrode, used in this study the concentration of waste water into the water CODCr was 2400±300mg/L, electrolytic voltage is 8V, time of 4h, water pH is neutral, plate distance of 2cm:Too much concentration into the water because the water viscosity is too large lead, electrode processing load is too large, reduce the production of free radicals OH·electrode can not be in this condition with organic pollutants effectively; as the voltage increases, cell within the current intensity increased, the electrode surface increased hydroxyl radical OH·, the electrode has sufficient capacity and occurrence of organic pollutants in water more efficient response, the voltage is too large, leading to increased side reactions within the cell; in acidic conditions are not well produced as OH·,the alkaline conditions inhibited the production of reduction products, so the efficiency of electrolysis in neutral conditions, the highest; appropriate plate spacing is conducive to the electrolysis of nitrobenzene, too small and too large plate spacing will affect the degradation efficiency of nitrobenzene.