Experimental Study On Treatment Of Acid Mine Drainage Using Medical Stones Based Sulfate Reducing Bacteria Immobilized Particles

This experiment is aimed at the acid mine drainage?AMD?solution in this region.It has the characteristics of extremely low pH and rich in SO₄^2-,Fe²⁺,Mn²⁺and other pollution ions.Based on the preliminary results of the research on the preparation of immobilized particles,it uses different regions.Medical stone is used as the main matrix component of the immobilized granules,and the medicinal stone,bagasse and sulfate reducing bacteria?SRB?liquid are organically mixed by polyvinyl alcohol-boric acid encapsulation crosslinking method,and prepared to have high immobilized particles of active SRB.And through the single factor experiment and response surface experiment to optimize the ratio of immobilized particle medicinal stone,the particles prepared by this ratio are used to carry out the characteristics and dynamic column experiments,and further study the effect of particle processing AMD,And hope to provide a new way to deal with AMD.The results of this experimental study show that:?1?The single factor experiment was designed based on the type,dosage and particle size of the medical stone.The results showed that the optimal distribution ratio of the particles was:the type of the medical stone was Henan Dengfeng,the dosage was 3%,and the particle size was200³00 mesh.?2?Through the response surface experiment,the three factors of medicinal stone type,dosage and particle size were optimized.The results showed that the optimal distribution ratio of the particles was:the type of medical stone is Henan Dengfeng,the dosage is 3%,the particle size is 200³00 mesh;the type of medical stone is Liaoning Fuxin,the dosage is 5%,and the particle size is 80¹00 mesh.?3?The experiments were carried out to match the SO₄^2-and Mn²⁺adsorption processes of the two particles prepared by the optimal ratio.The results show that the two particles are more consistent with the first-order reaction kinetics model for the SO₄^2-reduction process and the adsorption process of Mn²⁺is more in line with the Freundlich isotherm adsorption equation and the McKay quasi-secondary kinetic model.?4?The medicinal stone particles prepared by using the optimal ratio were filled into the column,and the 1#and 2#dynamic columns were respectively constructed for dynamic experiments.The results showed that the column filled with granule 2#was also the medical stone in Henan Dengfeng area,and the immobilized granules prepared by the medical granules with the particle size of 200³00 mesh and the dosage of 3%were better.?5?Characterization and analysis of two kinds of particles before and after AMD using SEM,EDS and XRD.The results show that the morphological structure of the surface and the cut surface changes greatly after the reaction,and there are obvious three peaks of S,Mn and Fe,mainly in the form of FeS,MnS,Fe?OH?₃ and Mn?OH?₂.