Method for treating nuclear power steam generator cleaning waste liquid and radioactive waste organic solvent

Abstract

The invention relates to the field of nuclear power waste treatment, and provides a method for treating a nuclear power steam generator cleaning waste liquid and a radioactive waste organic solvent. The specific technical scheme includes a step of pretreatment cleaning waste liquid, in which pretreatment of the cleaning waste liquid is carried out to form a homogeneous suspension liquid; a step ofcompatibility, in which the cleaning waste liquid and the radioactive waste organic solvent are mixed according to a compatibility ratio, and the COD reaches 200,000 to 400,000 mg / L after mixing; astep of supercritical water oxidation, in which the waste liquid mixed in previous step is injected into a supercritical water oxidation device for supercritical water oxidation reaction; a step of solid-liquid separation, in which the outlet liquid of the supercritical water oxidation device enters into a solid-liquid separation device, the separated solid is solidified, and the liquid is directly reused. Through the method, organic matters in the mixed waste liquid can be completely oxidized and removed, and the heavy metal removal rate is as high as 80% or more. After filtration, the sludge is solidified, and the produced water is directly reused. The part to be solidified is only the filtered sludge, which greatly reduces the mass of the portion to be solidified, thereby reducing theenvironmental impact.

Description

technical field [0001] The invention relates to the field of nuclear power waste treatment, in particular to a method for treating nuclear power steam generator cleaning waste liquid and radioactive waste organic solvents Background technique [0002] During the operation of nuclear power plants, chemical impurities, oxides, sludge, etc. are deposited on the tube sheet, support plate, tube bundle surface and gaps of the steam generator. With the increase of sludge thickness, pores and thermal load, it will lead to corrosion The concentration of corrosive impurities, even if the concentration of corrosive impurities is low, can cause corrosion and cracking of stainless steel heat transfer tubes in a large amount of sludge accumulation area. Therefore, the steam generator must be cleaned after running for a certain period of time. Cleaning has developed into a complete set of technologies, the main cleaning technologies are sludge gun hydraulic cleaning, low-pressure spray cl...

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Problems solved by technology

[0005] Aiming at the problem of cleaning waste liquid and radioactive waste organic solvents of steam generators in the nuclear power industry, the present invention provides a cleaning waste liquid and radioactive waste of nuclear power steam generators with simple process, short processing time, thorough treatment, water saving and energy saving. How to deal with organic solvents

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