Experimental Study On Degradation Of Phenol Wastewater By Three-dimensional Electrode Biofilm Reactor

In terms of social development,phenols come from a wide range of sources and yield is huge.Whether it is preparation of phenolic resin,synthetic fiber,or pharmaceutical,pesticide and dye production,phenolic pollutants can be produced.The waste water is often extremely complex,and how to treat the wastewater efficiently and cheaply has become a hot topic among environmental researchers.Phenol is one of the most basic and representative pollutants in phenolic pollutants.Therefore,the study of phenol as the research object and the method of three-dimensional electrode biofilm combination are used to study the dynamic experiment and lay a theoretical foundation for the degradation of phenol wastewater.Innovation point of this subject is to,will now deal with the advantage of phenolic pollutants electrode-SnO2 electrode degradation of phenol wastewater with biological membrane method,together with the method of continuous water continuous water reactor operation,and has made the dynamic analysis of phenol degradation,eventually establish the equation between the water concentration and other factors.This experiment homemade three-dimensional electrode biofilm reactor,adopt stainless steel material,its main electrode with spherical ceramic filter material as base,load with Sb,Mn element of SnO2 as particle electrode,and inoculation on particle electrode,cultivating biofilms,constitute a three-dimensional electrode biofilm reactor.The reactor is operated in continuous water and water.First of all,the test run reactor,the concentration of effluent contaminant reaches stable,and the reactor starts successfully,which lasts for about 10 days.The removal rate of phenol and COD was maintained at 80%and 70%respectively.The removal of phenol and COD has been improved with the addition of adequate amount of external voltage.Then,the influence of different residence time,voltage,initial concentration,aeration volume and initial pH on the removal rate of phenol and COD were examined.The results showed that the removal rates of phenol and COD were both increased and decreased.The optimum values of each factor are:the duration of stay time 4h,the voltage 6V,the initial concentration of no more than 250mg/L,the aeration amount of 300/L,and the initial pH= 7.The removal rate of phenol was 95.91%and the removal rate of COD was 90.76%(Initial concentration of 250mg/L).After orthogonal experiment,the influence of the aeration rate on the removal rate of phenol was obtained,and the pH value was the lowest.After the follow-up experiment,the removal rate of phenol was 95.73%,which was higher than the result of the orthogonal test 9 times.Finally,the experimental data are analyzed dynamically.After fitting,the biofilm degradation of phenol in 3d electrode is in accordance with the dynamic rule of "apparent first-order reaction".In addition,with the increase of voltage,oxygen,pH value,reaction rate constant all showed a trend of decrease after the first increase,the factors and the relationship equation of reaction rate constant K can be divided into two parts,when the value is less than the most appropriate value,the various factors of voltage U,air H,initial pH value M meet equation LnK=0.58815LnU-0.34356,R2=099761?LnK=0.88762LnH-3.30033,R2=0.99442?LnK=2.189361nM-2.46945,R2=0.9998;When the value of each factor is greater than the optimum value,the relationship between the three and the reaction rate constant K respectively satisfies the equation LnK=-1.6523LnU+ 3.67478,R2= 0.99353,LnH=-2.120651LnX+ 13.88798,LnK=-6.420621nM+ 14.3488,R2= 0.96043.Finally,the water concentration of the reactor phenol was derived from the above equation,and the equation with each factor was obtained.When the value of each factor is less than the optimum value,the concentration of phenol is CA,the initial concentration of CAO,the time of stay,the voltage U,the aeration volume H,and the initial pH value M satisfy the equation:When each factor is greater than the optimum value,the equation is satisfied:(?)According to the concentration equation,the water concentration of the reactor can be controlled by controlling the controllable factors.