2019 ⦽ǎႊᔍᖒ⠱ʑྜྷ⦺⫭ ⇹ĥ⦺ᚁݡ⫭ םྙ᧞Ḳ
225577
Development of Contaminated Soil Decontamination THFKQRORJ\IRU133¶VUsing
Selective Nuclide Adsorption Technique and Micro-bubble Vortex Breakdown Based on
High Pressure Cleaning
Woohyeon Rhee*, Dukwon Kang, Seungil Kim, Pilyong Jeon, and Damhyang Kim Elim-global Inc., 767, Sinsu-ro, Suji-gu, Yongin-si, Gyeonggi-do, Republic of Korea
*
1. Introduction
In June 2017, the National Energy Committee (N.E.C.) decided to immediately dismantle Kori Unit 1, the coXQWU\¶s first nuclear power plant and, 12 out RI WKH QXFOHDU SRZHU SODQW¶V design like will end by 2030. The nuclear power plant (NPP) dismantlement and decontamination market has begun to form, and the necessary technologies are needed accordingly.
This study is to develop the pilot-scale (1.2 m3/hr) decontamination technology of soil using high pressure washing and ultrasonic process in the decommissioning NPP.
2. Field Survey and Method
2.1 Field Survey
The system is a technology developed to secure decontamination technology in advance for contaminated soil generated by the Kori #1, NPP, which will be dismantled for the first time in the country. Therefore, the target, which are the basic data of the development of the soil-contaminated process, were collected and analyzed twice for soil near the Kori #1, NPP.
Fig. 1. Sampling point of Kori #1, N.P.P.
2.2 Analysis
The sampled soil was analyzed by commissioning an external testing agency with respect to pH, electrical conductivity, moisture content, organic content, pore rate and cation exchange ability.
225588
2019 ⦽ǎႊᔍᖒ⠱ʑྜྷ⦺⫭⇹ĥ⦺ᚁݡ⫭םྙ᧞Ḳ3. Pilot-scale Soil Decontamination System
3.1 Selection of the Decontamination Process
Fig. 3 shows a schematic diagram of the soil decontamination process to be developed. The soil is firstly decontaminated by high-pressure vortex washing process, and considering the contamination degree of each soil classified by particle size, the soil with high radioactivity is additionally subjected to the combined process of ultrasonic & degassing membrane process to carry out entire decontamination.
Fig. 2. Schematic Diagram of Pilot-scale Soil Decontamination Process.
3.2 Design the Technology
First, contaminated soil removes large contaminants through the trommel. Next, the particles are separated by particle size through a multi-stage separator and a hydro cyclone. The soils separated from the micro-soil are separated from the soil and water by filter press. The separated water moves through the deconta-mination process to the subsequent water treatment process. The water is cleanly filtered through the disk filter and membrane, and the ionic nuclides are removed through CDI and EDI to finally discharge the reusable water.
4. Conclusion
Pilot-scale Soil decontamination system (1.2 m3/hr) to prepare for the dismantling of nuclear power plants in Korea can improve their technological capabilities by securing original technologies. In addition, the cost can be expected to be reduced by reducing radioactive waste generated during the dismantling of nuclear power plants, which is expected to grow further if the market is expanded overseas.
ACKNOWLEDGEMENT
This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) granted financial resource from the Ministry of Trade, Industry and Energy, Republic of Korea (No. 20181510300800)
REFERENCES
[1] Sang-PLQ 3DUN HW DO ³,QIOXHQFH RI 3K\VLFR-chemical Properties on Cesium Adsorption onto 6RLO´ -RXUQDO RI 6RLO *URXQGZ (QYLURQ 27-32 (2017).
