Disposition of Tank 48H Organics by Fluidized Bed Steam Reforming (FBSR)

Jantzen, C.M.

Savannah River Site (S.C.)

关键词: Fluidized Beds;    Radioactive Waste Processing;    Performance Testing;    Storage Facilities;    Sodium Compounds;   

DOI  :  10.2172/820003
RP-ID  :  WSRC-TR-2003-00352
RP-ID  :  AC09-96SR18500
RP-ID  :  820003

美国|英语

来源: UNT Digital Library

【 摘 要 】

In order to make space in the Savannah River Site Tank farm, the Tank 48H waste must be removed. Therefore, the Tank 48H waste must be processed to reduce or eliminate levels of nitrates, nitrites, and sodium tetraphenyl borate in order to reduce impacts of these species before it is vitrified. Fluidized Bed Steam Reforming is being considered as a candidate technology for destroying the nitrates and the NaTPB prior to melting. The Idaho National Engineering and Environmental Laboratory was tasked to perform a proof-of-concept steam reforming test to evaluate the technical feasibility for pretreating the Tank 48H waste. The crucible (bench scale) tests conducted at the Savannah River Technology Center were initiated to optimize and augment the parameters subsequently tested at the pilot scale at INEEL. The purposes of the current study, organic destruction and downstream processing of T48H waste slurry were fulfilled. TPB was destroyed in all 19 samples tested with the simulated FB SR process at operational temperatures 650-725 degrees Celsius. A test temperature of 650 degrees Celsius optimized NO3 destruction during the formation of an Na2CO3 FBSR product. A test temperature of 725 degrees Celsius optimized NO3 destruction during formation of a sodium silicate FBSR product. Destruction of nitrate at greater than 99 per cent was achieved with addition of sugar as a reductant at 1X stoichiometry and total organic carbon analyses indicated that excess reductant was not present in the FBSR product. The use of sugar at 1X stoichiometry appears to ensure that excess reductant is not contained in the FBSR product that would alter the REDuction/OXidation equilibrium of the DWPF melter, while simultaneously assuring that NO3 is destroyed adequately. Destruction of antifoam with the simulated FBSR process was also achieved at operating temperatures between 650-725 degrees Celsius. based on measured total organic carbon.