[2H13-17] Migration/Sorption 3

[2H16] Decomposition Rate of Asphalt under the Presence of Microorganisms in the Coarse Sandstone Layer.

*Tatsunori Fukumaki¹, Mitsushi Motoyama², Naoyuki Tamura³ (1. JANUS, 2. JGC, 3. JNFL)

Keywords:Asphalt decomposition, Microorganisms

As a part of the safety assessment of a disposal facility for low-level radioactive waste, the decomposition rate of bitumen (asphalt) in the presence of microorganisms in soil (in rocks) was determined to be less than 1 g/m2/y, in addition to the cold and alkaline field environment. The microbial flora before and after the degradation test were also compared, and the predominance of cold- and alkaline-resistant microorganisms was observed.