title: Practical removal of radioactivity from sediment mud in a swimming pool in Fukushima, Japan by immobilized photosynthetic bacteria.
abstract: About 90% of the radioactive Cs in the sediment mud of a school's swimming pool in Fukushima, Japan was removed by treatment for 3 d using the alginate immobilized photosynthetic bacterium Rhodobcater sphaeroides SSI. Even though batch treatment was carried out 3 times repeatedly, the activity of immobilized cells in removing Cs was maintained at levels of about 84% (second batch) and 78% (third batch). Cs was strongly attached to the sediment mud because, even with HNO(3) treatment at pH of 2.00-1.60 for 24 h, it was not eluted into the water. Furthermore, more than 75% of the Cs could be removed without solubilization with HNO(3). This suggests that the Cs attached to the sediment mud was transformed into immobilized cells via the Cs(+) ion by the negative charge of the immobilized cell surface and/or the potassium transport system of the photosynthetic bacterium.
authors.affiliation: Materials Science and Engineering, Graduate School of Engineering, Hiroshima Kokusai Gakuin University, Aki-ku, Hiroshima, Japan. sasaki@hkg.ac.jp
authors.forename: Ken
authors.initials: K
authors.lastname: Sasaki
authors.forename: Hiroyo
authors.initials: H
authors.lastname: Morikawa
authors.forename: Takashi
authors.initials: T
authors.lastname: Kishibe
authors.forename: Ayaka
authors.initials: A
authors.lastname: Mikami
authors.forename: Toshihiko
authors.initials: T
authors.lastname: Harada
authors.forename: Masahiro
authors.initials: M
authors.lastname: Ohta
mesh_terms: D000327:Adsorption; D000464:Alginates / Q000737:chemistry; D061249:Batch Cell Culture Techniques; D001673:Biodegradation, Environmental; D001692:Biological Transport / Q000502:physiology; D018914:Cells, Immobilized / Q000737:chemistry / Q000502:physiology; D002588:Cesium Radioisotopes / Q000302:isolation & purification* / Q000378:metabolism; D020723:Glucuronic Acid / Q000737:chemistry; D006603:Hexuronic Acids / Q000737:chemistry; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007564:Japan; D017942:Nitric Acid / Q000737:chemistry; D018788:Radioactive Hazard Release; D011851:Radioactivity; D012242:Rhodobacter sphaeroides / Q000737:chemistry / Q000502:physiology*; D055672:Static Electricity; D013551:Swimming Pools
chemical_list: D000464:Alginates; D002588:Cesium Radioisotopes; D006603:Hexuronic Acids; D017942:Nitric Acid; D020723:Glucuronic Acid