Study on the Removal Performance of Natural Manganese Ore and Iron-Oxidizing Bacteria on the Arsenic

Abstract

In this study, through the leaching of iron oxidizing bacteria with natural manganese ore, by the using of X-ray fluorescence, the X-ray diffraction analysis, and scanning electron microscopy testing technology to characterize the prepared eroded manganese ore, which also gives a further research on the removal performance and mechanism of the eroded manganese ore on the arsenic. The results of the experiment showed that the saturated adsorption capacity of eroded manganese ore on the As(III) and As(V) were 18.52 mg/g and 19.23 mg/g respectively. The Langmuir adsorption model adsorption gives a good description on the removal of arsenic by the eroded manganese ore. The removal rate of arsenic is positively correlated with temperature, when the pH value is near neutral, the best removal performance of eroded manganese ore on the arsenic can be achieved, and the coexisting cation (Ca2+, Mg2+) can promote the removal rate of arsenic. With the characterization experiment, it shows that the main components (Mn, Si, Fe, Al) of manganese ore did not change before and after immersion, but the content of MnO decreased by 11.62%, Fe2O3 increased by 13.38%, the content of hydroxyl increase, porosity increased by 31.81%, porosity ratio increased 0.472.