| Summary: | 碩士 === 國立成功大學 === 環境工程學系 === 84 === FEASIBILITY STUDIES FOR OXIDATION OF LOW-LEVEL RADIOACTIVE
SPENT POWDEX RESIN IN SUPERCRITICAL WATERYuh-Jeen
HuangDepartment of Environmental EngineeringNational Cheng Kung
University, Taiwan,R. O. C.ABSTRACT Large quantities of low-
level radioactive (LLR) spent resins are generated from
condensate demineralizers and filters of nuclear power plants.
These LLR spent resins are difficult to process cement-
solidification using existing technologies. Spent resins with
basic engineering design characteristics of high ash, moisture,
and sulfur contents have made the incineration treatments more
complicated. Experiments were carried out to provide information
concerning the feasibility of using pyrolysis, heterogeneous
oxidation, supercritical water oxidation (SCWO) technology as a
LLR waste treatment process, and determined if further
development of the SCWO technology would be warranted.
Disappearance kinetics of the Powdex resin oxidation in
supercritical water were investigated. Experimentally, the
activation energy of the pyrolysis, heterogeneous oxidation,
SCWO reaction were 76, 26, 7 Kcal/mol approximately. Formation
of CoSO4 species during SCWO of Powdex resin was evident by XRD
and FTIR spectroscopies. Reaction intermediates (acetic acids)
and by-products (PAHs) generated from oxidation of Powdex resin
in supercritical water were also determined. In addition, based
on the laboratory-scale experimental approaches, a basic
engineering design for a SCWO pilot plant (50 kg/hr of Spent
Powdex) was completed. Keywords: SCWO, Radioactive Wastes,
Pyrolysis, Heterogeneous Oxidation
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