Influence of Various Factors on Arsenic Removal Using Ferruginous Manganese Ore

This paper dealt with the influence of various factors on As(III) and As(V) removal using ferruginous manganese ore, including environmental factors (temperature, time, light, pH) and coexisting ions(HCO3-,CO32-,Cl-,HPO4-, SiO32-, SO42-, Mg2+, Ca2+, Fe3+). The comprehensive influence of various factors was also studied in orthogonal experiment. The results showed that the removal efficiency of As(III) was up to 90.26%, while As(V) was only 79.88%, under the conditions of that manganese ore dosage was 0.1000g per 50ml polluted water, reaction time was 1 h, pH was 3.05, the concentration of arsenic was 204.45ug/l. Lower pH could achieve higher removal efficiency. Illumination was little beneficial to the removal efficiency. SiO32-, HPO42-, CO32- and HCO3- could reduce the efficiency, due to competitive adsorption and electrostatic repulsion. The results of orthogonal experiment indicated that SiO32- and HPO42- were the greatest competitors with arsenic for adsorptive sites on the manganese ore, while temperature and time had no significant effect on arsenic removal.