초록 ▼

This invention relates to apparatus and processes for the removal and recovery of concentrated acid such as HNO3 and radioactive cations such as cesium (Cs+) from a radioactive acidic waste stream resulting in the recovery of a decontaminated water product. The invention employs a combination of mem

This invention relates to apparatus and processes for the removal and recovery of concentrated acid such as HNO3 and radioactive cations such as cesium (Cs+) from a radioactive acidic waste stream resulting in the recovery of a decontaminated water product. The invention employs a combination of membrane electrodialysis stacks with each having its own specific cell configuration for performing a specific salt removal or salt concentrating step in the decontamination process.

대표청구항 ▼

An apparatus for the removal and recovery of acidic and radioactive components of a liquid waste stream comprising in combination a series of at least two electrodialysis units or stacks, each stack comprised of a cathode chamber at one terminal end, an anode chamber at the opposite terminal end, sa

An apparatus for the removal and recovery of acidic and radioactive components of a liquid waste stream comprising in combination a series of at least two electrodialysis units or stacks, each stack comprised of a cathode chamber at one terminal end, an anode chamber at the opposite terminal end, said chambers containing respectively a cathode and anode electrode, a deacidification stack being the first stack in the series having all of its chambers being separated one from the other by separate anion selective membranes defining between said electrode chambers at least one neutral liquid chamber positioned adjacent to the cathode chamber, a primary desalting stack being the second stack in the series comprising a multi-chamber unit having a plurality of alternating salt diluting and salt concentrating chambers defined by alternating cation and anion selective membranes, means for introducing a liquid to be treated into the cathode chamber of said deacidification stack with exit means for withdrawal of said liquid, means for passing said withdrawn liquid into and out of the salt diluting chambers of said primary desalting stack, further means for introducing a liquid into and out of the concentrating and electrode chambers of said primary desalting stack and means for passing a direct electric current transversely across the membranes and chambers of each stack in the series.