Study On The Degradation Of Phenol By Ultrasound And Ultraviolet Synergy Fenton

From the beginning of the birth of ultrasound technology, as a new technology, it is widely studied by scholars both at home and abroad.Ultrasound technology has the characteristics of strong maneuverability,high efficiency and no pollution,and it can be used alone or combined with other technologies,which is a potential water treatment technology. In the experiment, the mixed phenol solution as the research object, the removal rate of phenol as the understand of measurement,the different influence factors(phenol initial concentration, solution pH, processing time and Fenton reagent proportion) and laws were studied under different processing methods (ultrasound US alone, ultraviolet UA alone, ultrasound/ultraviolet combined technology,ultrasound/ultraviolet and the collocation of Fenton reagent),and the analysis and summary of experimental results determine the optimized conditions of use, and provide a reference for future technology route selection.The conclusion is as follows:(1)To the solutions of the different processing method,suitable pH is basic same, besides the ultraviolet’s proper pH value is7, and other methods are suitable for4; Single ultrasound and single ultraviolet treatment of phenol, the results show that the lower the initial concentration of phenol, the higher the removal rate. In general, to the degradation rate of20mg/L phenol solution, the influence of the processing time is that2h time efficiency is highest, in addition to joining Fenton reagent for1h; To single ultrasounds single ultraviolet and ultrasound/ultraviolet combined technology,their reaction kinetics equations were for the first order reaction, and enhancement factor f is1.32, which shows a certain synergy between ultrasound and ultraviolet.(2) The phenol solution first has been degraded by ultrasound/ultraviolet for2h, then Fenton reagent was jioned, its removal rates of phenol>ultrasound/ultraviolet/Fenton> single Fenton reagent at the same time, which shows that this method is helpful to reduce the use amount of Fenton reagent;under the condition of economy, Fenton:water samples is chosen for the proportion of1:100,though the appropriate reaction time may be extended up to the same phenol removal effect.(3) To the different processing methods,the removal rate of COD is differet,and the result is ultrasound/ultraviolet and the collocation of Fenton reagent> ultrasound/ultraviolet combined technology> single ultrasound≈single ultraviolet.Eventually, the results are identified:to20mg/L phenol solution whose pH is adjusted4, first which has been degraded by ultrasound/ultraviolet for2h and then added Fenton reagent, and for the consideration of economy,Fenton:water samples is chosen for the proportion of1:100,though the appropriate reaction time may be extended up to the same phenol removal effect,and after1h, phenol removal rate can be up to80.70%and90.05%after2h.