Degradation of acetonitrile through a sequence of microbial reactors |
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Authors: | Håkansson Kristina Welander Ulrika Mattiasson Bo |
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Affiliation: | Department of Biotechnology, Centre for Chemistry and Chemical Engineering, Lund University, P.O. Box 124, SE-221 00 Lund, Sweden. |
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Abstract: | Degradation of nitrogen containing organic compounds often leads to formation of ammonium and some low molecular weight organic compounds. The study is focused on degradation of acetonitrile in a sequence of stirred biofilm reactors, where the degradation of acetonitrile into acetic acid and ammonia takes place in the first two reactors. A large fraction of the acetic acid is also degraded in these reactors. The subsequent two reactors were introduced in order to take care of the ammonia, while a fifth reactor was a polishing step before the water was released to the recipient. From earlier studies it is known that the rate of acetonitrile degradation is approximately 80 g acetonitrile/ (m3 reactor h). In the present study nitrification proceeded with 10 g NH4(+)-N/(m3 reactor h) and the denitrification by 35 g NOx(-)-N/ (m3 reactor h). This means that the reactors involved in removal of the nitrogen component needs to be far larger than those dealing with degradation of the more complex molecules. |
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Keywords: | Acetonitrile Nitrification Denitrification Suspended carrier |
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