Based On Enhanced Precipitation Of Ca（DBS）₂ And Combine Microbial Flocculation GA1 Flocculation To Remove Rhodamine B

As people demanding for chemical synthetic textiles i ncreasing in recent year,Printing and dyeing wastewater pollution became seriously,Due to printing and dyeing wastewater composition is complicated,high colority,and low biodegradability,has been a problem of wastewater treatment for a long time.The printing and dyeing wastewater contains substances such as dyes,slurry,oil,acid and alkali。Dye wastewater is one of the most important pollution components in printing and dyeing wastewater。dye wastewater not only can poison creature such as carcinogenic to aquatic organism and humans,but also can Effects the photosynthesis of aquatic plants,causing aquatic creatures decrease and deterioration of water quality.Causing serious damage to the ecological environment.Rhodamine b is a kind of typical basic triphenylmethane dyes,and is also a kind of soluble cationic dye.It is mainly used for colored glass,cloth and paper industries.Rhodamine b is a carcinogenic organic solvents,and has been widely used in food industry,but it still often reported that food containing Rhodamine b since it has been forbidden in recent year.In this paper,in order to achieve high efficiency of Rhodamine b,we combined the saturated precipitated calcium dodecyl benzene sulfonic acid（Ca（DBS）₂）and microbial flocculant GA1（MBFGA1）flocculation sedimentation method.In this work,RB molecular solubilized by SDBS and the Ca²⁺influenced on SDBS micelles that containing the RB molecular（SDBS-RB micelles）were investigated.Furthermore,when RB molecular precipitate with CD BS particles,it would be flocculated by microbial flocculation GA1（MBFGA1）.The SDBS dosage,Ca²⁺dosage,MBFGA1 dosage,concentration of initial RB solution,pH and stirring time were discussed respectively in this paper,And then separately discussed t he effect of SDBS dosage,Ca²⁺dosage,MBFGA1 dosage between the SDBS and Ca²⁺interaction.Finally by using The response surface methodology（RSM）,environmental scanning electron microscope（ESEM）analysis and e nergy dispersive spectrometer（EDS）to provided strong proof to explore RB removal process and the reaction mechanism between SDBS and Ca²⁺.The experimental result shows that the best experimental conditions of SDBS dosage,Ca²⁺dosage,MBFGA1 dosage,initial concentration of RB solution were 2.4mM,5 mM,4 mL/L and 50 mg/L respectively,the pH value was 10;optimum agitation condition were 5min mixing at 200r/min and 30 mixing at 40r/min.Under the experimental conditions,RB and SDBS removal rate can reach 99.46%and 99.32%respectively,it prove that this method is not only has high removal efficiency of RB,but also has no secondary pollution to the environment.Through RSM for the analysis of interactive effects and ESEM and EDS for the analysis of special treated flocs,we can conclude that t he interaction mechanism between SDBS and Ca²⁺was depend on the related concentrations of SDBS and Ca²⁺rather than CMC value of SDBS.On the RB removal process,when Ca²⁺dosage relative SDBS dosage enough,even if the SDBS dosage higher than 1 CMC,Ca²⁺will continue to react with SDBS micelle which solubilized RB molecules（SDBS-RB micelle）and generate RB adsorbed on Ca（DBS）₂ particles（CDBS-RB particles）;in another case,when SDBS dosage relative Ca²⁺dosage enough,SDBS micelle will continue redissolve CDBS-RB particles,and eventually will prompt CDBS-RB particles completely dissolved as the SDBS dosage increasing.Therefore,the Ca²⁺dosage should relative SDBS dosage enough in order to obtain higher RB removal efficiency,the RB would adsor bed on CDBS particles and flocculated by MBFGA1.The method researched by this article was easy to operate,high removal efficiency and no secondary pollution,hence,it has a certain application prospect in real RB wastewater purification processes.