TITLE:
Simultaneous removal of cesium and strontium using a photosynthetic bacterium, Rhodobacter sphaeroides SSI immobilized on porous ceramic made from waste glass
AUTHORS:
Ken Sasaki, Hiroyo Morikawa, Takashi Kisibe, Kenji Takeno, Ayaka Mikami, Toshihiko Harada, Masahiro Ohta
KEYWORDS:
Cs and Sr Removal; Photosynthetic Bacteria; Immobilization; Ceramic Made from Waste Glass; Recovery Type-Ceramic
JOURNAL NAME:
Advances in Bioscience and Biotechnology,
Vol.4 No.1,
January
18,
2013
ABSTRACT: This
study investigated practical and simultaneous removal
of cesium (Cs, initial concentration of 5 mg/L) and strontium (Sr,
initial concentration of 5 mg/L) using a
photosynthetic bacterium, Rhodobacter
sphaeroides SSI, immobilized on recovery-type porous ceramic
made from glass waste. When 4 - 8 pieces /L of SSI immobilized ceramic were
added to synthetic sewage wastewater containing glucose, almost 100% of Cs and
57% - 61% removal of Sr was observed after 3 day’s aeration treatment. The high
potassium (K) concentration in wastewater suppressed Cs removal, but did not
affect Sr removal. Other substrates such as lactic, acetic, and propionic
acids were useful for Cs and Sr removal.
But, removal efficiencies were lower than about 50%. When the practical
outdoor removal experiment carried out using1 m3 vessel, almost 100% of Cs and 51% of
Sr were removed like a laboratory experiment after 3 day’s aerobic treatment.
After treatment, the SSI immobilized ceramic was recovered easily from water
using an electromagnet. This SSI immobilized ceramic seem to remove
radioactive Cs and Sr from water environments of Fukushima,Japan.