The Study On The Degradation Of Phenolic Organic Pollutants By Biofilm-electrode Method

With the current rapid development of China's economy, more and more organicindustrial products has greatly enriched and developed the civilization of humansociety, making people's living standards gradually improved, but subsequently alsocaused a lot of negative impact. It has long been trying various ways the treatment oforganic contaminants, biofilm-electrode method has been developed in recent years ofnew organic pollutants in processing technology. This method adopts the technologyimmobilizing microorganisms on the electrode surface, forming a layer of biofilm,and then the organic pollutants could be degraded in the dual role of biological andelectrochemical method with the effect of low-voltage DC. However, it has been thetreatment of organic pollutants in biofilm-electrode technology, mainly used innitrogen removal systems. We will use biofilm-electrode technology to deal with otherorganic contaminants, such as phenol, 2, 4 - dichlorophenol, pentachlorophenol andp-methylphenol, study the treatment effect in different conditions .This paper first studied the use of biofilm-electrode approach to different phenolicorganic pollutants (phenol, 2, 4 - dichlorophenol, pentachlorophenol andp-methylphenol), and showed the treatment effect in different conditions , systematicstudy on the biofilm-electrode approach to the characteristics and patterns of organic pollutants.(1) This paper mainly studied the biofilm-electrode preparation, as well as thebiofilm-electrode reactor design and production of biofilm-electrode approach to thestudy of organic pollutants phenol, membrane electrode which give the goodfoundation for the subsequent degradation of phenolic organic pollutants.(2) Biofilm-electrode method can successfully degrade phenol and we found thatthe organic pollutants phenol degradation method with the biofilm-cathode ofbiofilm-electrode reactor in a divided electrolytic cell is the method with besttreatment effect in the more vertical degradation of phenol. Based on this study wefound that biofilm-electrode approach to the best conditions for organic pollutants,phenol is a current density at 0.5mA/cm2, the initial phenol concentrations of less than200mg / L and the temperature is 35℃.(3) Biofilm-electrode method can successfully degrade chlorophenols. 2, 4 -dichloro-phenol is an important organic chemical intermediate products, mainly usedin organic synthesis. Biofilm-electrode method can (be) successfully removed 2, 4 -dichlorophenol. It was found that 2,4 - dichlorophenol removal efficiency can reach100% at 48h, but by 72 h COD removal rate can reach 100% in the dividedelectrolytic cell (anion-exchange membrane),. At the same time 2,4 - dichlorophenoldegradation with the best condition for the current density of 0.5mA/cm2, the initial2,4 - dichloro-phenol concentration of 100mg / L and the temperature of 30℃.Moreover, without exchange membrane electrolytic cell treatment effect showedmuch better than the exchange membrane electrolytic cell, due to no exchangemembrane electrolytic cell can be while using anodic oxidation as well as the role ofmicrobial biofilms cathode 2, 4 - dichloro-phenol was degraded by the electric jointaction of chemical and microbiological results. Pentachlorophenol is a widely used,toxic recalcitrant organic compounds, generally much difficult to be degradedtreatment, but the biofilm-electrode method can successfully degradepentachlorophenol. The study showed a different membrane biofilm-electrode methodfor the degradation of pentachlorophenol. It was showed that an important effect usinganion-exchange membrane deal with the effect of pentachlorophenol was significantlybetter than that of cation membrane. Degradation of the biofilm-electrode method tooptimize the conditions of pentachlorophenol was found in the divided electrolyticcell (anion-exchange membrane), the pentachlorophenol with the best condition for the current density of 1mA/cm2, the initial pentachlorophenol concentration of 100mg/ L and temperature at 30℃. In the same time we found that biofilm-electrode reacorin an undivided electrolytic cell and the biofilm-electrode reactor in a dividedelectrolytic cell for the degradation of pentachlorophenol was not the same effect.(4) With the method of biofilm-electrode degrading p-methylphenol, we found thatin the divided electrolytic cell, p-methylphenol removal efficiency could reach 80% at24h, and COD removal rate of 84% at 24h. Degradation of the biofilm-electrodemethod to optimize the conditions for p-methylphenol was better in the dividedelectrolytic cell, and the p-methylphenol degradation with the best condition for thecurrent density 0.5mA/cm2, the initial concentration of less than 100mg / L andtemperature at 35℃.