Study On Treatment Of Dyeing Wastewater By Electrochemical Oxidation Process Combined Macroporous Resin Adsorption

The dyeing wastewater. which produced in the production of dyeing factories is considerable complex. It contains many kinds of organic dyestuff. It has complex characteristic, such as strong toxicity, deep tone, the wide fluctuations, difficult biodegradable, the wide variation of composition, a large quantity of water and density. So dyeing wastewater is the difficulty of industry wastewater treatment. Understanding and developing effective technology of dyeing industry wastewater treatment is the important task of environmental protection industry.The study is in connection with the problem of the pollution of printing and dyeing wastewater, both analyzing the sources of dyeing wastewater and expounding the characteristics, harm and meanings of treatment of dyeing wastewater, while explaining conditions of dyeing wastewater at home and abroad.after fairly effective domestic and foreign methods of treatment have been both analyzed and contrasted, it is determined to use adsorption—Electrolysis to cope with dyeing wastewater.In this study, dyeing wastewater was treated by that macroporous resin adsorption method combined with electrochemical oxidation process. Macroporous resin has adsorbed compounds in the aromatic ring which were in deying wastewater. We have measured the Chemical Oxygen Demand (CODcr) and color under various experimental conditions. Experimental results shows that:pH value of dyeing wastewater made significant impact when doing absorption. Under alkaline conditions. Macroporous is more conducive to adsorption of organic compounds in wastewater. The more amount of resin the faster adsorption of organic compounds and the more adsorption amount. Variety of organics components in wastewater, There are still some contaminants are more difficult to be macroporous resin adsorption. Macroporous resin is more easily absorbed aromatic ring compounds which have the same frame structure with it. When time growing, more organic compounds be adsorbed. Reaction time over 7 hours to 8 hours, CODcr have been little changed, so the adsorption reach equilibrium. But the CODcr value is still large, amounting to less than emission standards Therefore it need to combine electrochemical oxidation for wastewater re-treatment.In this paper, a titanium-made thermal decomposition of lead dioxide anode. Titanium is insoluble lead dioxide anode electrode. Mainly through hydroxyl radicals produced to oxidize organic matter in wastewater. Hydroxyl radicals have High oxidation potential. Second only to the known oxidant F2. Most organic pollutants can be oxidated without select. Reaction rate can be adjusted. But for the liquid dye wastewater used in this treatment are not effective. Many side reactions, high energy consumption. For water which had been treated by Macroporous resin have a good result. The results show that Higher current strength is more conducive to the removal of CODcr in wastewater. when the strength reaches 80mA, Severe reactions and side effects increase, Electrodes at both ends had generated a large number of bubbles. Mass of organic environmental pollutants. For the electrolytic system,mixing mainly to improve the environment of mass transfer. Hydroxyl radicals produced by the electrode to full contact with the organic matter. Thereby enhancing the removal rate of CODcr. This paper chose the Na2SO4 to be electrolyte which Only play the role of conducting. Study the impact of electrolyte on the electrolytic. We found that different concentration of electrolyte influence on the electrolytic system The higher the concentration the better electrolysis. When the organic matter concentration decreased to a certain extent, High electrolyte concentration will make the electrolysis reaction is severe, At the same time side effects will be increased. It affects Hydroxyl radicals contact with the contaminants. pH value have impact on hydroxyl radicals, on the form of pollutants in wastewater. and the interaction among pollutants. This paper examines the different pH, electrolysis time 3 hours pollutant removal situation. PH value of electrolyte 3 hours had little effect on CODcr removal, plate distance has little impact on CODcr removal rateThe results show that macroporous resin adsorbs aromatic compounds which were in the wastewater, then electrochmical oxidation process treats those remains very well, which were left from adsorption, the whole system makes greater range of CODcr of dyeing wastewater could be treated,and the CODcr removal of dyeing wastewater was approximately 99%. Finally the CODcr of treated wastewater was under 100 mg/1.