Study On The Performance Of Conductive Materials For Enhanced Cycle Recycling Of Methyl Orange By Sodium Alginate/Shivaella MR-1

Each year,the amount of printing and dyeing wastewater in China is about 700million tons,accounting for 10%of the total wastewater volume in the country.The most widely used azo dye in the printing process is an aromatic compound that decomposes under certain conditions to produce a variety of aromatic amines containing carcinogens.Traditional physical treatment or chemical treatment technology has been unable to meet the current green,ecological and environmental requirements,and microbial treatment technology has gradually become mainstream.The Schwannella is widely distributed and has diverse metabolic capabilities for organic dye wastewater,which can degrade azo dyes well.Therefore,how to improve the removal performance of azo dyes by Shewanella is the key to this technology.In this paper,the simulated methyl orange?MO?wastewater was used as the research object.The immobilization of Shewanella MR-1 was carried out by sodium alginate?SA?embedding method,and a set of laboratory rapid preparation of embedded microspheres was established.Process technology,and add several different conductive materials to the embedded microspheres,study the removal performance of conductive microspheres for MO,and provide a new method for removing methyl orange.The main research contents are as follows:?1?Preparation of SA-embedded microspheres and SA/Shewanella MR-1microspheres.Using air compressors and semi-automatic dispensers as the main body,a set of laboratory rapid preparation methods for SA-embedded microspheres was created,which greatly improved the efficiency and reduced the preparation time from the existing 12-15 hours to 1-2 hours..The prepared SA-embedded microspheres and the SA/Shivalella MR-1 microspheres were uniform in size,and the added microorganisms did exist inside the microspheres after preparation.?2?Preparation of SA/Shewanella MR-1/SWCNTs microspheres and their removal performance for MO.The SA/Shewanella MR-1/SWCNTs microspheres were prepared.The characterization results showed that SWCNTs were dispersed in the microsphere system,and pore channels were formed inside the microspheres,which increased the rheological properties of the microspheres and significantly enhanced the The mechanical strength of the microsphere itself.The removal experiment of MO showed that the MO removal of the microspheres was high,and the addition of SWCNTs improved the removal performance of the microspheres by MO.The removal rate of each reaction in the horizontal mode for 2 h was above 90%,and there was no The outflow rate of the lateral reaction of the microspheres to which SWCNTs were added was reduced to about 60%.The removal efficiency of the lateral removal mode is higher than that of the vertical removal mode,and the time for the MO removal rate to reach90%is reduced from 3-4 hours to 1-2 hours.There was no change in the morphology of the microspheres after the experiment,and the removal rate of MO was high and it could be recycled.?3?Preparation of SA/Shewanella MR-1/GO microspheres and their removal performance for MO.The SA/Shewanella MR-1/GO microspheres were prepared.The characterization results showed that GO was dispersed in the microsphere system,and a network pore structure was formed on the surface of the microspheres,which increased the rheological properties of the microspheres.The mechanical strength of the microspheres is significantly improved.The results of MO removal experiments showed that the MO removal of the microspheres was higher.The addition of GO improved the removal performance of the microspheres by MO.The removal rate of the lateral mode reaction at 2 h was stable above 80%,but no addition of GO.The removal rate of the lateral reaction of the ball at 2 h was reduced to about 60%.The removal efficiency of the lateral removal mode is higher than that of the vertical removal mode,and the time for the MO removal rate to reach 80%is reduced from 3-4 hours to 1.5 to 2.5 hours.The morphology of the microspheres after the experiment did not change,and the removal rate of MO was relatively high and could be recycled.?4?Preparation of SA/Shewanella MR-1/nano-Fe3O4 microspheres and their removal performance for MO.The SA/Shewanella MR-1/nano Fe₃O₄ microspheres were prepared.The characterization results showed that the nano-Fe₃O₄ was dispersed in the microsphere system and had little effect on the micro-morphology of the microspheres.Not much,improving the mechanical strength of the microsphere itself.The experimental results show that the MO removal of the microspheres is higher.The addition of Fe₃O₄improves the removal performance of the microspheres by MO,but the improvement effect is only obvious in the lateral mode,which is inferior to the above two microspheres.The morphology of the microspheres after the experiment did not change,and the removal rate of MO was relatively high and could be recycled.