Effect Of Functional Fibers Supported Titanate Nanotubes On The Stability Of SBR Activated Sludge System

Printing and dyeing wastewater not only has the characteristics of high chemical oxygen demand and high chromaticity,but also contains a lot of"three"toxic organic pollutants.A large number of printing and dyeing wastewater has entered the water environment.It has become an important factor threatening the safety of water environment in China.The treatment of printing and dyeing wastewater with adsorbents has the characteristics of wide application,good treatment effect,reusable and so on.As a kind of adsorbent,nanomaterials have the following advantages:great adsorption capacity,wide application range of pH and high selectivity.But the existing adsorbents are difficult to recover and have poor reproducibility during the use of the adsorbents.In this study,titanate nanotubes were loaded on carbon fibers and activated carbon fibers respectively,and prepared low dimensional carbon based functional nanomaterials with excellent dye adsorption and in situ regeneration ability of ultraviolet radiation,Taking methylene blue dye wastewater as the research object,based on the excellent adsorption characteristics of titanate nanotubes and the photocatalytic ability of carbon materials doped with UV light,the optimal process of treating low methylene blue wastewater with low dimensional carbon based nanomaterials was studied.The nano materials degradation mechanism of methylene blue was discussed from the perspective of pollutants adsorption kinetics and Photocatalytic Degradation Kinetics Research by modern testing techniques such as TEM,SEM,XPS,XRD and so on.Secondly,sequencing batch reactor activated sludge process?SBR?was applied to simulate the biological treatment system of printing and dyeing wastewater.The effect of low dimensional carbon based nanomaterials on the efficiency of SBR system and microbial community abundance and composition under stable operation condition was discussed.The main contents are as follows:?1?Analysis of different dosage of TNTs@CF,different initial concentration of dye wastewater,the effects of different reaction pH and other factors on the treatment efficiency,The result showed that CTNTs@CF=0.2g/L,pH=6.5⁶.7;CMB=20mg/L was the most optimum conditions.TNTs@CF in different concentrations of methylene blue dynamics in the process of experiment,In the kinetic experiments of TNTs@CF for different concentrations of methylene blue,it is confirmed that the adsorption of TNTs@CF on MB can be better simulated by second-order kinetic.?R^2>0.99?,and the equilibrium adsorption amount obtained by fitting is equivalent to the actual measurement,the adsorption of TNTs@CF on MB was mainly chemical adsorption.At the same time,by comparing the Langmuir and Freundlich models,it is determined that the Langmuir model can better simulate the adsorption behavior of MB on TNTs@CF?R2>0.96?,indicating that the adsorption of MB on TNTs@CF was monolayer adsorption.The maximum theoretical adsorption capacity of methylene blue fitted by the Langmuir model is 395.26mg.g^-1,meanwhile,it also could help us to explore mechanism on the performance.?2?Analysis of different dosage of TNTs@ACF,different initial concentration of dye wastewater,the effects of different reaction pH and other factors on the treatment efficiency,The result showed that C_TNTs@ACF=0.2g/L,pH=6.5⁶.7;C_MB=20mg/L was the most optimum conditions.In the photocatalytic kinetic experiments of TNTs@ACF for different concentrations of methylene blue,it is confirmed that photocatalytic degradation of methylene blue reaction follows first-order reaction kinetics,it also conforms to Langmuir-Hinshelwood?L-H?model.Meanwhile,it also could help us to explore mechanism on the performance.?3?The aerator was added into the beaker to simulate the construction of the SBR reactor.Meanwhile,the degradation of methylene blue and the change of COD in the system were detected at different concentrations.It was found that the decolorization rate of methylene blue was increased in the process for a period of 5days in each cycle,in the later,the increased speed of the decolorization rate decreased,finally tends to be stable,and the optimum of each cycle rate can reach50%,it shows that the system has a certain effect of decolorization on the methylene blue;at the same time,the COD in the whole system in each cycle can be reduced to about 100mg/L,the system has a good effect on the removal of COD in solution.