High-specific-radioactivity radioactive wastewater negative pressure evaporation concentration treatment system and method thereof

Abstract

Provided are a high-specific-radioactivity radioactive wastewater negative pressure evaporation concentration treatment system and a method thereof. In the system, raw water in a wastewater raw water tank is pumped into a negative pressure evaporation tower, water vapor formed by evaporation enters a primary cooling tower and a secondary cooling tower in sequence through defogging by a first defogging tower, cooled condensate water is pumped into a condensate water temporary storage tank, a vacuum pump vacuumizes from the secondary cooling tower, concentrated liquid on the bottom of the negative pressure evaporation tower is pumped into a concentrated wastewater tank, and then is pumped to a negative pressure dryer. Dried solid residues are to be prepared and disposed. Water vapor on the outlet of the negative pressure dryer enters a second defogging tower, after defogging, the water vapor enters the primary cooling tower. The system is simple in structure, rational in technological processes, safe and controllable in treatment process, and conveniently realizes remote control and automatic operation. The system and the method has good application prospect.

Description

technical field [0001] The invention belongs to the technical field of nuclear fuel cycle, and in particular relates to a negative pressure evaporation concentration treatment system and method for a large amount of high specific radioactive waste water produced in the spent fuel reprocessing process. Background technique [0002] A complete nuclear fuel cycle system is the basis for clean and efficient use of nuclear energy (electricity), and the reprocessing of spent fuel elements is an important part of the nuclear fuel cycle. The operation of nuclear power plants will produce a large amount of spent fuel. If it is not properly disposed of, it will pose a potential safety threat to the earth's biosphere, and thus pose a potential hazard to the human living environment. More economical and feasible technologies must be sought for safe disposal of spent fuel. In the field of spent fuel reprocessing technology, water reprocessing technology is currently the only reprocessing...

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Problems solved by technology

For example, although the traditional ion exchange method is a suitable method for treating low-level U-containing wastewater, it is widely used in domestic nuclear facility wastewater treatment plants. In the case of high-concentration wastewater of cations, the ion-exchange resin in the ion-exchange column will be quickly saturated and a large amount of radioactive secondary solid waste will be generated, which is inefficient and does not meet the principle of waste minimization, and is not suitable for treating such high-level wastewater; traditional Flocculation co-sedimentation is a mature technology for treating low-level Pu-containing radioactive wastewater. However, when this technology is applied to treat such high-concentration wastewater containing various radioactive cations, it will also produce a large amount of waste slurry with high radioactive levels. This high Horizontal radioactive mud needs to be further properly disposed of, and the cost is relatively high. This method will generate a large amount of high-level solid waste and does not meet the principle of waste minimization. In the early days, natural evaporation ponds were used to treat radioactive waste water in some countries. Use natural volatilization in high temperature and dry areas to concentrate and treat low-level radioactive wastewater. However, due to the high environmental risks such as leakage of radioactive wastewater, this method has long been banned by many countries, and this technology cannot be used to treat tritium. waste water

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