DEVELOPMENT OF HAZARDOUS SLUDGE SIMULANTS FOR ENHANCED CHEMICAL CLEANING TESTS

Eibling, R.

关键词: CLEANING;    CONTROL;    DISSOLUTION;    ECCS;    HYDROXIDES;    HYDROXYLATION;    METALS;    MONITORING;    OXALATES;    OXALIC ACID;    OXIDATION;    OXIDES;    OZONE;    POTENTIALS;    REMOVAL;    SAVANNAH RIVER PLANT;    SLUDGES;    TANKS;    VISIBLE RADIATION;    WAS;   

DOI  :  10.2172/980764
RP-ID  :  SRNL-STI-2010-00170
PID  :  OSTI ID: 980764
Others  :  TRN: US201012%%1209

美国|英语

来源: SciTech Connect

【 摘 要 】

An Enhanced Chemical Cleaning (ECC) process is being developed by Savannah River Remediation (SRR) to aid in Savannah River Site (SRS) High-Level Waste (HLW) tank closure. After bulk waste removal, the ECC process can be used to dissolve and remove much of the remaining sludge from HLW tanks. The ECC process uses dilute oxalic acid (1 wt %) with in-line pH monitoring and control. The resulting oxalate is decomposed through hydroxylation using an Advanced Oxidation Process (AOP). Minimizing the amount of oxalic acid used for dissolution and the subsequent oxidative destruction of oxalic acid will minimize the potential for downstream impacts. Initial efficacy tests by AREVA demonstrated that previous tank heel simulants could be dissolved using dilute oxalic acid. The oxalate could be decomposed by an AOP that utilized ozone and ultraviolet (UV) light, and the resultant metal oxides and hydroxides could be separated out of the process.