The Research On Methylene Blue Wastewater Treatment By The Combination Of Ozone/persulfate Catalytic Oxidation And SBR Process

With The Industrial civilization gradually mature,the wanton emissions of industrial wastewater become the main reason of pollution on the environment.Lots of hydrocarbons,which kind of refractory organic matter(POPS)mixed with industrial wastewater discharge into the natural water body.Which made the environment problem seriously.Methylene blue(MB),as a kind of typical ion dye into the water will not only decrease transmissivity of water,affects the water landscape.It's low toxicity can also affects the healthy development of the ecological network of water environment.For the pollution present situation of MB wastewater and the deficiency of the current advanced oxidation technologies,this paper adopt the Ozone(O3)/Sodium Persulfate(SPS)catalytic oxidation + batch activated sludge method(SBR)process for MB wastewater degradation,aims to provide a reference for POPS depth processing.This paper studied the Fe2+ activated SPS in degradation of 50 mg/L of MB solution in the process of initial pH?Fe2+ and SPS concentration?Fe2+/SPS optimal dosing amount?reaction time and reaction temperature on the MB and COD degradation effect.Results show that in the acidic conditions,the degradation of MB rate is higher than in alkaline environment.Initial pH=3 is best for the degradation of MB.Too high or too low concentration of Fe2+ and SPS will certain effect the decoloring of MB.Fe2+ concentration and the best dosing quantity for SPS is C(S2O82-):C(Fe2+):C(MB)=0.4mmol//L:0.2mmol//L:50mg/L.Considering the introduction of a minimum of oxidant and remove the best effect.Under the best conditions,Fe2+/SPS system to the decolorizing effect of MB can reach 80%-90%.The oxidation of the intermediate salinity is 20%-40%.Temperatures help activation reaction,makes the decoloring rate of MB of increase.The best reaction temperature of MB molecules decoloring is 40 ?.And then studied the O3/SPS/catalyst system for high concentration MB wastewater treatment with different type of catalyst in the process of O3 concentration,pH,SPS/Fe2+ additive amount to the removal of MB and COD.And the effect of CO32-,Cl-ion,citric acid and other background in O3/SPS/Fe2+ system.The results show that the O3/SPS/Fe2+for 300 mg/L MB wastewater treatment effect is best.In ozone concentration is 16.5 mg/1,exposure volume 0.5 1/min,SPS/Fe2+ dosing quantity tendency for 1.41:1.12 the tendency for 1 initial pH=4,reaction time for 40 min,O3/SPS/Fe2+ system of MB and the removal rate of COD were 99.57%and 51.77%respectively.The existence of CO32-,Cl-,citric acid will inhibit the oxidation of ·OH? SO4·-.Through the simulation of the reaction rate constant.The result shows that Fe2+/SPS and O3/SPS/Fe2+ system in the degradation of MB wastewater are conform to the pseudo first order reaction kinetics model.Liquid chromatography mass spectrometry(LC-MS)analysis shows that the oxidation of MB intermediate mainly contains amino phenol,2 aminophenol,benzothiazole,phenol and benzene homologues.Finally,investigating the SBR biological treatment unit of the intermediate of MB degradation process.The experimental results show that through 35 min advanced oxidation process.And then SBR biological degradation,300 mg/L of the total MB wastewater,MB and COD removal rate steady at 98%and 98%respectively.The water meets discharge standard.When intermediate product wastewater with glucose in A ratio of 1:5 matrix into the effluent,the SBR to the removal rate of COD?NH4+-N and TP were 87.6%?80.8%and 89.1%.The discharge water meets the level.