Effects of Simulated Rare Earth Recycling Wastewaters on Biological Nitrification
| Autor: | Malgorzata M. Lencka, Alexandra Navrotsky, Richard E. Riman, Yoshiko Fujita, Ali Eslamimanesh, Andrzej Anderko, Joni M. Barnes |
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| Rok vydání: | 2015 |
| Předmět: |
Nitrosomonas europaea
Nitrobacter winogradskyi Nitrobacter Wastewater Article chemistry.chemical_compound Ammonia Environmental Chemistry Tributyl phosphate Recycling Nitrites Waste management biology General Chemistry Hydrogen-Ion Concentration biology.organism_classification Nitrification Organophosphates Solutions chemistry Solubility Metals Environmental chemistry Rare Earth Thermodynamics Metals Rare Earth Sewage treatment Oxidation-Reduction Environmental Sciences |
| Zdroj: | Environmental science & technology, vol 49, iss 16 |
| Popis: | Increasing rare earth element (REE) supplies by recycling and expanded ore processing will result in generation of new wastewaters. In some cases, disposal to a sewage treatment plant may be favored, but plant performance must be maintained. To assess the potential effects of such wastewaters on biological treatment, model nitrifying organisms Nitrosomonas europaea and Nitrobacter winogradskyi were exposed to simulated wastewaters containing varying levels of yttrium or europium (10, 50, and 100 ppm), and the extractant tributyl phosphate (TBP, at 0.1 g/L). Y and Eu additions at 50 and 100 ppm inhibited N. europaea, even when virtually all of the REE was insoluble. Provision of TBP with Eu increased N. europaea inhibition, although TBP alone did not substantially alter activity. For N. winogradskyi cultures, Eu or Y additions at all tested levels induced significant inhibition, and nitrification shut down completely with TBP addition. REE solubility was calculated using the previously developed MSE (Mixed-Solvent Electrolyte) thermodynamic model. The model calculations reveal a strong pH dependence of solubility, typically controlled by the precipitation of REE hydroxides but also likely affected by the formation of unknown phosphate phases, which determined aqueous concentrations experienced by the microorganisms. |
| Databáze: | OpenAIRE |
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