Tritium-containing wastewater treatment system and treatment method

Abstract

The invention relates to a tritium-containing wastewater treatment system and treatment method. The system is formed by cascading multiple stages of water rectifying towers and then being cascaded with a single-stage N-VPCE, tritium-containing wastewater is pretreated with the multi-stage water rectifying tower cascading system and rectified into a low-tritium-content component and multiple high-tritium-content components of which the tritium concentrations are gradually increased; an N-VPCE column steam-phase catalytic exchange is introduced into the high-tritium-content components of which the tritium concentrations are gradually increased from the bottom to top in the state of high-temperature steam according to the tritium concentration sequence from low to high, hydrogen is introduced from the bottom of the N-VPCE column steam-phase catalytic exchange, tritium in the steam is transferred into the hydrogen phase through catalytic exchange, and water flowing out of N-VPCE column steam-phase catalytic exchange is fed back to the last-stage rectifying tower. The tritium-containing wastewater treatment system is simple in structure, reasonable in procedure and low in construction and operation cost; the treatment method is high in practicability and stable and reliable in operation, can be used for solving the technical problem of inland nuclear power tritium environment emission control and is suitable for tritium-poor water production.

Description

technical field [0001] The invention relates to the technical field of nuclear power plant wastewater treatment, in particular to a tritium-containing wastewater treatment system and treatment method. Background technique [0002] During the operation of nuclear power plants, a large amount of tritium-containing wastewater with low tritium content will be produced. Tritium is a radionuclide, and its oxidized forms of tritium water (HTO, DTO and T2O) are 10,000 times more radioactive than elemental tritium gas (HT, DT and T2). Therefore, tritium-containing wastewater is directly discharged into The environment, especially discharge into inland water systems, will have adverse effects on the environment and public safety. The relevant national standards stipulate that when the tritium-containing wastewater generated during the operation of inland nuclear power plants is discharged, the concentration of tritium at a distance of 1 km from its discharge outlet should be less tha...

AI Technical Summary

Problems solved by technology

However, since the annual production of tritium-containing wastewater reaches the level of thousands of tons during the operation of a single nuclear power unit, the use of N-VPCE technology alone requires a huge amount of hydrogen isotope gas to be separated, and the cost is also high

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