| Autor: |
Anderson, James E., Lofton, Tiffany V., Kim, Byung A., Mueller, Sherry A. |
| Předmět: |
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| Zdroj: |
Water Environment Research (10614303); Apr2009, Vol. 81 Issue 4, p357-364, 8p, 1 Diagram, 3 Charts, 3 Graphs |
| Abstrakt: |
Membrane bioreactors (MBRs) have been installed at automotive plants to treat metalworking fluid (MWF) wastewaters, which are known to contain toxic and/or recalcitrant organic compounds. A laboratory study was conducted to evaluate treatment of a simulated wastewater prepared from a semisynthetic MWF, which contains two such compounds, dicyclohexylamine (DCHA) and ethylenediaminetetraacetic acid (EDTA). Primary findings were as follows: • During stable operating periods, almost all chemical oxygen demand (COD), total Kjeldahl nitrogen (TKN), and EDTA were removed (by >96%). During somewhat unstable periods, COD removal was still extremely robust, but removal of EDTA and TKN were sensitive to prolonged episodes of low dissolved oxygen. • Nitrogen mass balance suggested 30 to 40% TKN removal by assimilation and 60 to 70% by nitrification (including up to 34% TKN removal via subsequent denitrification). • Dicyclohexylamine appeared to be readily biodegraded. Maximum DCHA and EDTA degradation rates between pH 7 and 8 were found. • An Arthrobacter sp. capable of growth on DCHA as the sole source of carbon and energy was isolated. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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