Sewage treatment-radioactive wastewater treatment technology

1 Sources of radioactive wastewater

The radioactive waste water mainly comes from the excreta produced by patients after taking or injecting radioisotopes during the diagnosis and treatment, the radioactive waste water discharged from the containers, cups and laboratory cleaning water for the isotope packaging, and labeled compounds.

2 Water quality and discharge standards for radioactive wastewater

1 The concentration range of radioactive wastewater is 3.7 × 102Bq / L ~ 3.7 × 105Bq / L.

2 The amount of wastewater is 100 ~ 200L / bed.d.

3 The discharge of radioactive waste water in hospitals implements the newly-developed “Pollutant Discharge Standards for Medical Institutions”, which stipulates that the total α <1 Bq / L and the total β <10 Bq / L shall be monitored at the discharge port of radioactive sewage treatment facilities.

3 Design of radioactive wastewater system and decay tank

1 Separate collection system for radioactive wastewater should be set up. The radioactive domestic sewage and test flushing wastewater should be collected separately. The pipelines for collecting radioactive wastewater should be special corrosion-resistant pipes, generally stainless steel pipes or plastic pipes.

2 The radioactive test washing wastewater can be directly discharged into the decay pond. The fecal domestic sewage should be purified by the septic pond or sewage treatment pond before being discharged into the decay pond.

3 The decay pond is designed or selected according to the bed position and water volume.

4 The decay cell is designed according to the type and intensity of the isotope used. The decay cell can be batch or continuous.

5 Intermittent decay pool adopts multi-format intermittent discharge; continuous decay pool, with diversion wall in the pool, push-flow discharge. The volume of the decay cell is calculated according to the 10 half-lives of the longest half-life isotope, or calculated according to the decay formula of the isotope.

6 The decay pond should be anti-seepage and anti-corrosion.

4 Monitoring and management

1 Intermittent decay cells are monitored before discharge; continuous decay cells are monitored once a month.

2 Septic tanks or treatment tanks that collect and treat radioactive sewage are cleaned once every six months. Before cleaning, the radioactive standards should be monitored before disposal.

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