Removal of oxo anions from silicate-containing water

摘要

The present invention relates to a process for removing oxo anions from water and aqueous solutions having a high proportion of silicate by means of a filter arrangement comprising at least one anion exchanger and at least one oxo anion-specific adsorber, and to a filter arrangement to be used for this purpose.
Water to be purified flows through at least one anion exchanger in a filter unit C1 which is connected to a closed secondary brine circulation comprising at least one oxo anion-selective adsorber in a filter unit C2, the water to be purified not coming into direct contact with the oxo anion-selective adsorber.