How is the nuclear waste water produced in Japan?

The production process of nuclear wastewater in Japan is: the original coolant of the reactor and the newly injected water for cooling the core after the accident.

1, reactor primary coolant: In a nuclear reactor, in order to continue nuclear fission, it is necessary to continuously inject water into nuclear fuel rods as coolant to take away the heat generated by the nuclear reactor. However, these coolants may contain radioactive substances during use, which makes them one of the sources of nuclear wastewater.

2. Newly injected water for cooling the core after the accident: After the nuclear accident, in order to prevent the nuclear reactor from further deterioration, it is usually necessary to inject a large amount of water into the reactor to cool the nuclear fuel rods. However, during the cooling process, water may be polluted by radioactive substances, thus becoming one of the sources of nuclear wastewater.

Treatment method of nuclear power plant wastewater

1, precipitation method

Precipitation method is to add precipitant into nuclear waste water, and reduce the content of radioactive elements in nuclear waste water through the coprecipitation reaction between chemical components in precipitant and radioactive elements. At present, the commonly used industrial precipitants mainly include aluminum-iron precipitant, calcium-alkali precipitant and phosphate precipitant.

2. Adsorption method

Adsorption method is a method of adsorbing radioactive elements with adsorbent, which is a physical treatment method. Adsorbent has strong adsorption capacity because of its developed internal pore structure and large specific surface area. At present, the commonly used adsorbents are activated carbon and zeolite.

3. Ion exchange method

The principle of ion exchange method is to exchange ions with nuclear waste water through ion exchanger, so as to remove radioactive ions from nuclear waste water. The radioactive ions contained in nuclear waste water are mostly cations, so the active groups with positive charges in the ion exchanger can exchange with the radioactive cations and exchange the radioactive ions into the exchanger.

The above contents refer to Baidu Encyclopedia-Nuclear Wastewater.