OCEAN DECONTAMINATION: HIGH ABILITY REMOVAL METHOD TO RADIOACTIVE CESIUM FROM OCEAN SLUDGE BY USING MICRO BUBBLES AND ACTIVATING MICROORGANISMS
Keywords:Ocean Decontamination, Radioactive Cesium, Micro Bubbles, Microorganism Activator, Coagulant
The Fukushima nuclear accident of March 11, 2011, soil and water had been contaminated by
radioactive cesium. Moreover, radioactive cesium was found in the ocean sludge in Tokyo Bay flowing from
rivers. Cesium which is adsorbed to the sludge cannot be easily removed. One of the authors developed
decomposition and purification system, a circulation-type system by micro bubbles, that is, by creating
aerobic state, aerobic bacteria are activated resulting to decomposition and purification of ocean sludge.
Based on the hypothesis that radioactive cesium is adsorbed on the surface of the sludge deposition. It is
considered that cesium can be eluted after decomposing the deposited sludge. Once the cesium is eluted in
the water, it can fix to a mineral such as zeolite. Eluting and fixing cesium adsorbed on sludge takes so much
time. In this case, the concept of removing the left sludge by flocculation method and then followed by
coagulating sedimentation method is studied. In this study, our objects is to show the effectivity and
efficiency of using flocculation and coagulating sedimentation in removing radioactive cesium. As the results,
we pointed out this method is very good.