title: Fate of radiocesium in sewage treatment process released by the nuclear accident at Fukushima.
abstract: The nuclear accident at the Fukushima Daiichi Nuclear Power Plant (FDNPP) which occurred after the Great East Japan Earthquake on March 11, 2011 resulted in releases of radionuclides such as (134)Cs (half-life:T1/2=2.06 yr), (137)Cs (T1/2=30.04 yr) and (131)I (T1/2=8.05 d) to the environment. For this paper, we observed the monthly variations of radiocesium ((134)Cs and (137)Cs) and stable Cs concentrations in influent, effluent, sewage sludge, and sludge ash collected from a sewage treatment plant 280 km north of the FDNPP from July to December, 2011. Using the stable Cs results, we concluded the mass balance of Cs in the sewage treatment plant showed that about 10% of the Cs entering the sewage treatment plant would be transferred to the sewage sludge, and then Cs in the sewage sludge was totally recovered in the sludge ash. The behavior of Cs was similar to that of Rb, but it was not similar to that of K in the sewage treatment process.
authors.affiliation: Department of Civil and Environmental Engineering, Iwate University, Ueda 4-3-5, Morioka, Iwate 020-8551, Japan. Electronic address: naoki@iwate-u.ac.jp.
authors.forename: Nao
authors.initials: N
authors.lastname: Kamei-Ishikawa
authors.forename: Ayumi
authors.initials: A
authors.lastname: Ito
authors.forename: Keiko
authors.initials: K
authors.lastname: Tagami
authors.forename: Teruyuki
authors.initials: T
authors.lastname: Umita
mesh_terms: D002588:Cesium Radioisotopes / Q000032:analysis*; D006207:Half-Life; D007564:Japan; D055848:Nuclear Power Plants; D011834:Radiation Monitoring; D018788:Radioactive Hazard Release; D012722:Sewage / Q000737:chemistry*; D014875:Water Pollutants, Radioactive / Q000032:analysis*
chemical_list: D002588:Cesium Radioisotopes; D012722:Sewage; D014875:Water Pollutants, Radioactive
keywords: Mass balance; Radiocesium; Sewage treatment process; Stable cesium