The effect of dissolved solids on the destruction of organics by ultraviolet oxidation
Technical Report
·
OSTI ID:52772
The 200 Area Effluent Treatment Facility (ETF) was designed and built to treat and dispose of the 242-A evaporator process condensate (PC). Because of the robustness of the facility, there is the possibility of utilizing it to treat not only the PC, but also various waste waters generated during the environmental restoration of the Hanford site. These waste waters could include purge water/groundwater and fuel basin water. The groundwater at the Hanford site is contaminated with organic chemicals such as carbon tetrachloride. It also contains a high level of nitrates. The ETF is a proposed means to treat this contaminated groundwater with the organics being destroyed in the ultraviolet oxidation (UV/OX) process. Nitrates are known to absorb ultraviolet (UV) light. Because the ETF will be adding sulfuric acid as pH adjustment and treating waste water streams with ammonia and nitrate, it is prudent that the individual effects of these constituents on the organic oxidation rates be understood. Four series of tests were derived to determine the effects of dissolved solids on the destruction of organic chemicals in the UV/OX process. These were as follows: (1) volatilization test to verify that organic volatilization was not occurring; (2) UV transmittance tests to study effects of various levels of dissolved solids on the transmittance of UV light through the test solution; (3) baseline kinetic tests to establish baseline oxidation rates without the presence of dissolved solids; and (4) kinetic tests with dissolved solids present to study effects of the dissolved solids on the organic oxidation. The conclusions show that nitrate is the ion which causes the greatest decrease in oxidation rate. Sodium, sulfate, and ammonium will minimally influence the oxidation rate. These results can be used in developing a comprehensive model in the future.
- Research Organization:
- Westinghouse Hanford Co., Richland, WA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- AC06-87RL10930
- OSTI ID:
- 52772
- Report Number(s):
- WHC-SD-C018H-TRP--015; ON: DE95010564
- Country of Publication:
- United States
- Language:
- English
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