Objective To study the application value of vacuum drainage technology in radioactive wastewater discharge system of hospitals,and provide theoretical basis and reference for relevant institutes to design or renovate their radioactive wastewater discharge systems.Methods Based on the composition of vacuum drainage system and gravity drainage system,the differences in water consumption and other factors of different systems were theoretically evaluated.To take the radioactive wastewater discharge system in a hospital as a research example,the storable periods of the fixed decay pool were calculated by using the two different drainage techniques.Results Compared with the traditional gravity drainage technology,the vacuum drainage technology could save a lot of water and significantly reduce wastewater discharge.The water consumption was 16％of that of ordinary toilets with gravity drainage.By using the vacuum drainage technology to reform the radioactive wastewater discharge system of the hospital under the same amount of diagnosis and treatment workload,the storable period of radioactive wastewater could be extended by nearly three times,from 92.5 d before the renovation to 297 d after the renovation,without increasing the capacity of the decay pool.After the transformation,the total activity and volumetric activity concentration of 131I when discharging wastewater from each decay tank could be reduced to 4 096 Bq and 0.17 Bq/L,respectively,and the volumetric activity concentration was much lower than the national emission requirements.Conclusions Vacuum drainage can significantly reduce wastewater production,and is worth promoting and applying in nuclear medicine departments.
关键词
真空排水技术/医院/放射性废水/衰变池
Key words
Vacuum drainage technology/Hospital/Radioactive waste water/Decay pool
万方数据