Toshiba Corp and IHI Corp co-developed the "Sarry-Aqua," a transportable treatment system for radiation-tainted water.
It pumps low-concentration contaminated water with a pump and removes radioactive caesium from the water in a container that stores adsorbent. It can process a ton of contaminated water in one hour and lower the density of radioactive caesium in the water to 10 becquerels per kilogram, which is the value that Japan's Health, Labour and Welfare Ministry is considering to use as the new upper limit of the contamination of drinking water, or lower.
The new system was developed by reducing the size of the "Sarry," a polluted water treatment system being used at the Fukushima Daiichi Nuclear Power Plant. Toshiba and IHI reduced the number of active components such as pump and motor and realized stable and trouble-free operation, they said.
To ensure the safety of workers, a shield was installed inside the container that stores adsorbent used to remove radioactive materials such as caesium. The container is a general-purpose 200L drum and can be handled with a forklift, etc.
The new system can be transported by mounting all the equipment on an internationally-standardized 20-foot container (approximately 6.1 x 2.4 x 2.6m) and pulling the container with a truck. It can be used for processing swimming pool water and agricultural water containing radioactive caesium as well as water produced by decontamination. To sell the system in Japan, new legislation is required. So, Toshiba will start talks with the central government and local governments in January 2012.