Therotical And Experimental Study On Treatment Of Wastewater Containing Aniline By Solar STEP Process

Aniline is not only an important organic chemical raw material and fine chemical intermediate,but also an organic pollutant,which is the most widely distributed in wastewater,having the greatest impact.The wastewater like aniline causes enormous threat for the ecological environment,and seriously endanges the health of biological and human,because it has the feature of biochemical degradation-resistant,low biochemical degradation rate,handling difficulty and so on.At present,there are a variety of methods for the treatment of aniline wastewater,which still exist a variety of problems and defects.Solar thermal electrochemical production(STEP)takes high temperature electrolysis as the core to decompose large molecules,which is stable and having high reaction energy,into energetic molecules,utilizing photoelectric effect,solar thermal effects and solar electrochemical effects.Solar energy STEP process greatly improves the efficiency of solar energy conversion and provides energy for the reaction,using solar energy photoelectric effect combined with solar thermal effects.In this paper,We applied Solar energy STEP process to aniline wastewater firstly,solar thermal effects provides high temperature for wastewater,photoelectric effects provides power and combined with electrochemical effects to reduce the amount of aniline.Though calculating the theoretical potential under different temperatures during the degradation process of aniline wastewater,influences of the anode material and the experimental factors on the UV spectrum,electrical potential the removal rate of COD and degradation of aniline were studied to speculate that the degradation process of aniline.Simultaneously,we also analyze the gas collected via GC technology and calculate the current efficiency during the degradation process of aniline wastewater,utilizing solar energy STEP process.It is indicated that Aniline has a good degradation effects via solar energy STEP process.Anode materials have a greater impact on the electrochemical oxidation of aniline.Therefore,we investigated four electrodes.And it is found that Ti/(IrO2&Ta2O5)has the greatest impact on the electrochemical oxidation of aniline,the higher the temperature is,the flatter the polarization curve becomes.The loss of energy of Ti/(IrO2&Ta2O5)is small,and it has good stability.Aniline wastewater was oxidized in the bottle,using Ti/(IrO2&Ta2O5)as anode,platinum as cathode,the influence of various factors on the degradation of aniline was investigated respectively,to determine the optimal reaction conditions as follows:reaction temperature is 90?,the reaction time is 120 min,pH 8,the initial concentration of aniline is 100mg/L,the voltage is 2V,the concentration of sodium sulfate is 5g/L.Outdoor STEP experiment of aniline was carried out under the best conditions of electrolysis,which proves further evidence that STEP process is conducive to the degradation of aniline.With analyzing the gas collected,it is proved that it does occurred competitive reaction of water on the anode.The energy consumed cant be used entirely for the degradation of aniline pollutants.With CO2 as the goal product calculation of current efficiency increases gradually,proved that as the temperature rises,the oxygen evolution reaction gradually weakened.Though cyclic voltammeter and analyzing the wastewater after degradation by UV spectroscopy,STEP process for solar degradation mechanism of aniline were discussed.The results of this experiment show that apply Solar energy STEP process to the wastewater treatment,on the one hand it can reduce the amount of pollutants in waste water,on the other hand it can precipitate a green clean,renewable energy-H2,which provide a strong proof that Solar energy STEP process is a green cleaning means for wastewater treatment.