Iron and Manganese Removal by Oxidation

During experimental treatment of ground water from well 118 ultraviolet light and ozone (UV/OZ), precipitation of iron and manganese oxides occurred. The oxides were found to interfere with the process because of their opacity. The possibility of removing iron and manganese in a feedwater pretreatment process has been investigated. The process envisioned would have utilized the unreacted ozone vented from the UV/03 process; other oxidizing agents were not considered because of their higher cost relative to the ozone available in the vent gas. Although the pretreatment process is technically feasible, several tank-agitator sets would be required in conjunction with a vent gas compressor and auxiliary instrumentation. Instead of the pretreatment process, a simpler scheme is proposed that would consist only of a recirculation loop through a filter. Fluid from UV/03 unit would be filtered and returned to the unit so that substantially all the precipitates would be removed as formed.