Patent ID: 9085469
Filing Date: 2015-07-21
Classification: C02F

Abstract:
1. A method of treating water having perchlorate ions comprising: a. directing the water through an ion exchange resin, wherein the ion exchange resin removes the perchlorate ions from the water; b. regenerating the ion exchange resin with a brine to produce a regenerated ion exchange resin and a brine having perchlorate ions; c. treating the brine having perchlorate ions with a filter and filtering the brine to produce a brine filtrate and a reject stream, wherein the reject stream has a perchlorate ion concentration that is higher than the perchlorate concentration of the brine filtrate; d. mixing a reducing agent with the reject stream in the presence of manganese dioxide to initiate an oxidation-reduction reaction wherein the perchlorate ions are reduced to chloride ions and the reducing agent is oxidized into an oxidized reducing agent, the oxidation-reduction reaction producing water containing the chloride ions and the oxidized reducing agent; e. separating the oxidized reducing agent from the chloride ions; f. regenerating the oxidized reducing agent to form a regenerated reducing agent and mixing the regenerated reducing agent with the reject stream containing perchlorate ions; and g. recycling the brine filtrate to the ion exchange resin to regenerate the ion exchange resin.