ABSTRACT
One of the most attractive technologies for the removal of arsenic from groundwater used for drinking water production is adsorptive filtration with iron (hydr)oxide rich media. In our previous research we showed that such media can be produced by filtration of Fe(II) containing water through porous carrier, e.g., pumice. However, the produced material, Iron Oxide Coated Pumice (IOCP), showed poorer adsorption capacity than Iron Oxide Coated Sand (IOCS) from iron removal plants. This research focused on further optimization of the IOCP coating procedure by varying mode of iron addition and duration of coating. The efficiency of coating was evaluated by batch adsorption experiments and compared with IOCS from an iron removal plant based on aeration and rapid sand filtration. Under studied conditions, the results showed higher adsorption capacity of IOCP than IOCS. It was also determined that prolonged pumice coating can result in blocking of meso pores, responsible for the adsorption of arsenic, and as such reduce it removal capacity.
