Study On The Zero-Discharge Technology Of Printing And Dyeing Wastewater On The Elecro-Catalytic And Biochemical Methods

Each year half of the wastewater discharged by industrial wastewater, industrial wastewater contains large amounts of synthetic organic compounds, these organisms can cause direct discharge of environmental pollution and hazards to human health. These traditional methods is difficult to effectively degrade the organic matter in waste water, and electrochemical method without addition of chemical reagents, the degradation of organic matter can be quickly and effectively to protect the environment. The electrode material is the basis of electro-catalytic oxidation method to study the preparation of the electrochemical performance of the electrode material is the forefront of issues. Electrochemical treatment of industrial wastewater from the start, the development of anode materials, the electrochemical oxidation of tannery wastewater treatment process and dyeing wastewater was studied and discussed in this paper.Deposition by brushing method and prepared Ti/SnO2-CeO2 electrodes, characterized by scanning electron microscopy, brushing the surface of the electrode prepared obvious cracks. Deposition of the electrode surface without cracks, the electrode surface area, high catalytic activity electrodes. In neutral conditions, electrodeposition Ti/ SnO2-CeO2electrode prepared in the oxygen evolution potential of about 2.3V, the electrode performance and stability. With the prepared Ti /SnO2-CeO2 electrode Acid Red-14 wastewater treatment, the experimental results surface in the 4V,pH value is 3,the electrode spacing of 10mm, the electrolysis after 30min,the color of Acid Red-14 removal to 99%,removal efficiency significantly.Extremely difficult for the printing and dyeing wastewater biodegradable characteristics, zero-emissions technology research and development:first with electro-catalytic method to improve their biodegradability, to find economic treatment conditions, and then the biochemical treatment, the water used for cooling water back to water. It was found, the actual printing and dyeing wastewater contains large amounts of solids, in the electrolysis process easy to adhere to the electrode surface, making the electro-catalytic performance degradation, the use of inverted pole electrode surface can effectively prevent the contamination. Electrocatalysis of economic conditions:cell voltage 3V, the main electrode surface area and water volume ratio of 1:6, very down once every 5min, the processing time 60min. Under these conditions, COD removal rate was 45%, BOD5/CODCr increase from the 0.27 before treatment to 0.84, greatly improved the biodegradability. Then by biological treatment, COD removal rate was 96.7%, COD reduced to 68mg/L, up to the national emission standards. Electrophoresis with the development of our group coating process, the effluent can be directly used as cooling water in water, to achieve zero discharge of wastewater.