The batch tests on new catalytic filtration masses creation by natural materials modification with MnO2 supporting by electrolysis with the view of Fe and Mn removal

Abstract

Among the most common and problematic groundwater contaminants are iron and manganese compounds. Specific filter materials are of primary importance in removing them from groundwater. They can be based on natural or modified materials. Modification of the natural materials used for traditional water treatment is one of the factors determining the efficiency of the Fe and Mn removal process, because raw natural media do not effectively remove them from the water. For this reason, research has been carried out on the modification of selected natural materials with coatings that accelerate the removal of iron and manganese from water. In order to shorten the activation time, the coating process was supported with an electrolytic method. The research was conducted on sand and aluminosilicate, which were activated with a KMnO4 solution by reducing it with natural reducing agents – coffee and lemon juice. Conducted experiments let to achieve new catalytic masses for Fe and Mn removal from the water. All tested materials were covered with oxidation layer of MnO2. The best materials coated with precipitated MnO2 were aluminosilicates of both finer- and larger-grain size. The process of electrolysis allowed a significant reduction in a modification time. After filter columns backfilling with the new modified beds, both aluminosilicates showed the best efficiency in Fe and Mn removal from the water and the most stable MnO2 coating. Electrolysis support let to shorten the time of backwash.