Then the system was retested using simulated supernatant. Testing in the STS started before construction was complete and was accomplished by first testing components individually.
The existing high-level waste storage tanks - 8D-1, 8D-2, and 8D-3 - required major renovations to permit transfer of the high-level waste from tank 8D-2 to tank 8D-1, to house the components that comprise the STS in tank 8D-1, and more » to store decontaminated wastes in tank 8D-3. The construction of this system was accomplished in five phase in parallel with completion of design to allow for faster completion of the project. Design of the STS was started in 1982 in parallel with the selection of the ion exchange material. This report discusses construction and testing of the STS. The Cs-137 removed from the waste and absorbed onto zeolite ion exchange material is temporarily stored in tank 8D-1 until it can be encapsulated in glass and disposed of as high-level waste. After treatment in the STS, the decontaminated supernatant is processed as low-level waste and finally encapsulated in cement for eventual disposal.
Cesium removal is accomplished in the STS by processing the supernatant (liquid) portion of the high-level waste through three or four ion exchange columns filled with zeolite. The main purpose of the Supernatant Treatment System (STS) is to remove more than 99.9 percent of the radioactive cesium (Cs-137) from the high-level waste stored in tank 8D-2.
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