A system and method for non-contact high-efficiency membrane distillation treatment of radioactive wastewater

Abstract

The invention discloses a non-contact high-efficiency membrane distillation treatment system and method for radioactive waste water, comprising a heat exchange unit, a constant temperature water tank, a low-temperature evaporator and a membrane assembly which are sequentially communicated through pipelines. The constant temperature water tank is provided with a waste water inlet pipe. A feed pump is arranged on the pipeline between the constant temperature water tank and the low-temperature evaporator; the heat exchange unit includes a water vapor condenser, an air heater, a heat pump system and several blowing pipes arranged in the membrane module, and the blowing pipes pass through the wet purging The air pipe is connected with the water vapor condenser, the water vapor condenser is connected with the blowing pipe through the dry purge air pipe, the membrane module is connected with the air heater through the return air pipe, and the air heater is connected with the air inlet at the bottom of the low temperature evaporator through the pipeline , the dry purge air pipe is connected with the return air pipe through the pipeline. The invention satisfies the high volume reduction and deep purification treatment requirements of radioactive waste water generated in the process of nuclear power plant operation, nuclear power plant operation, nuclear emergency and the like.

Description

technical field [0001] The present invention relates to the technical field of radioactive wastewater treatment, in particular to a system and method for treating radioactive wastewater by non-contact high-efficiency membrane distillation. Background technique [0002] Uranium mining, operation and decommissioning of nuclear facilities and nuclear power plants, spent fuel reprocessing and nuclear emergency will generate a large amount of radioactive wastewater. continuous development. Membrane distillation technology takes advantage of the characteristics of hydrophobic microporous membranes that only allow volatile components such as water vapor to pass through the membrane pores, and is a membrane separation process driven by the vapor pressure difference on both sides of the membrane. The process can be carried out without heating the solution to boiling, the device is simple, the operating conditions are mild, and the purification effect is good, and it is widely used i...

AI Technical Summary

Problems solved by technology

[0003] However, in the traditional membrane distillation technology, the waste liquid is in direct contact with the membrane. When treating radioactive wastewater with complex components and high salinity, the hot side membrane is in direct contact with the radioactive wastewater, which will easily cause the membrane to be easily polluted, with short life and low flux. Shortcomings, and in order to improve the membrane flux, a higher temperature difference is generated on both sides of the membrane, and the energy consumption is also increased accordingly. It cannot meet the requirements of timely and on-site treatment of a large amount of radioactive wastewater generated during the development of the nuclear industry, and needs to be improved.

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