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The ISEP+® system combines an ISEP® continuous ion exchange system for removal of perchlorate with a perchlorate destruction module (PDM) to allow brine recycle. The ISEP® portion utilizes 20 or 30 ion exchange beds (approx 25 cubic feet of resin per bed) that are mounted on a slowly rotating carousel. The rotation of the carousel moves the beds slowly through the required sequence of operations, which includes perchlorate adsorption, backwash, regeneration, rinse and displacement. These operations are going on simultaneously as the carousel rotates.
Different fluids are distributed through a patented rotary valve allowing for concurrent or countercurrent flow through the resin beds depending on the requirements of each unit operation.
The inclusion of multiple resin beds in adsorption, each with a different degree of exhaustion, ensures that perchlorate levels in the treated water remain well below the action level while fully utilizing the resin capacity. The automated adsorption and regeneration of the system insures a continous supply of treated water.
The ISEP® is operated under full automatic control from a programmable logic controller (PLC) located in a control panel. The PLC program controls the amount of brine needed, the concentration of the dilute brine, and the flow rate of softened rinse water required to optimize the performance of the ISEP®. Since nitrate and sulfate will be removed from the well water along with the perchlorate, periodic analysis of the influent to the ISEP® for these constituents of desirable in order to update the program for operating the process.
The ISEP+® portion involves a unique process and catalyst for catalytic destruction of perchlorate as well as nitrate. This catalyst was developed by UMPQUA Research Company, a contractor specializing in life support technologies for NASA manned spaceflight applciations. UMPQUA has licensed the exclusive rights for this catalyst and developed it for viable commercialization in the ISEP+® process. Using a catalyst and reactor system, the perchloratte undergoes a rapid reduction reaction that converts perchlorate and nitrate to chloride ions, nitrogen gas, and water. The treated waste brine can then be recycled back to ISEP® as a regenerant stream.
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