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- W4231090103 abstract "In Hokkaido University, laboratory wastewaters are collected periodically, and treated in a treatment plant. Usually, the collected wastewaters are very acidic and contain various heavy metal ions as well as chelating agents. The precipitation of heavy metal ions as hydroxides will be incomplete unless the chelating agents are pretreated by oxidation. A special treatment process in which CrO3, Fe3+, and Ca2+ are added prior to the neutralization with NaOH solution has been adopted to over- come this difficulty. This paper describes the basic research conducted to develop the treatment process, especially in relation to the oxidation of chelating agents by CrO3. Among many chelating agents, EDTA, DTPA, and Tetren strongly interfere with the formation of metal hydroxides. However, EDTA and DTPA are easily decomposed by CrO3. The effectiveness of CrO3 addition is demonstrated for (A) an actual wastewater to which some EDTA had been added, and (B) a number of model wastewaters containing Fe3+, Zn2+, Cr3+ ions, EDTA, and other chelating agents. The proper operating conditions for oxidation, i.e. CrO3 concentration, solution acidity, temperature, and reacting time are determined experimentally." @default.
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- W4231090103 date "1982-01-01" @default.
- W4231090103 modified "2023-09-30" @default.
- W4231090103 doi "https://doi.org/10.4139/sfj1950.33.291" @default.
- W4231090103 hasPublicationYear "1982" @default.
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