Treatment Rate Improvement of the Ozone Oxidation Method for Laundry Waste Water

概要

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Radioactive laundry waste water generated in nuclear power plants includes organic compounds to be removed, for which ozone oxidation treatment is a possibility. To verify the applicability, its total organic carbon concentration (TOC) lowering rate improvement was examined in 0.5×10−3 m3 batch and 3×10−2 m3 pilot equipment experiments. In the batch experiments, ozone at a concentration of 200 g/Nm3 was dispersed into 0.5×10−3 m3 of Simulated Laundry Waste Water (SLWW) with TOC of 11 mM. Total organic carbon concentration was measured every hour to see the effects of the temperature, and the initial concentrations of both H2O2 and NaOH which were added to urge OH radical generation from ozone. In the pilot equipment experiments, 1×10−2 to 3×10−2 m3 of the SLWW were circulated using an ejector to disperse the ozone. The influences of the flow rate and the SLWW volume on lowering TOC were examined, because they were related to the ejector dispersion performance and the appropriate ozone addition per SLWW volume. Appropriate initial H2O2 and NaOH concentrations in the batch experiments were 14.7 mM and 1 mM, respectively. Lowering of TOC became faster at higher temperatures, because ozone self-decomposition and OH radical diffusion to the organic compound molecules were promoted. Lowering of TOC also became faster at higher flow rates, while the influence of the volume became saturated.
社団法人日本原子力学会の論文
2001-02-25