Anoxic/Oxic Biodegradation of Aminobenzene
Publication: Journal of Environmental Engineering
Volume 125, Issue 7
Abstract
Biodegradation of aminobenzene, which is used as the only source of carbon and nitrogen, is evaluated in a single fluidized bed reactor operated in a temporal, anoxic/oxic mode. The experimental evidence indicates that total organic carbon (TOC) is removed with >91% efficiency at a feed concentration of 100 mg/L and a dilution rate of 2.4 day−1. Moreover, about 53–63% of feed total Kjeldahl nitrogen (TKN) is also removed, confirming that effective removal of nitrogenous matter in aminobenzene (i.e., the −NH2 group) is achievable in a temporal, anoxic/oxic environment. The kinetic analysis shows that TOC removal in oxic cycles is rapid and substantial, which enables nitrification to proceed at a discernible rate. In addition, the data on TOC and removal in anoxic cycles reveal that carbonaceous matter in aminobenzene and/or its intermediate metabolites is effectively utilized for denitrification. The best treatment performance, in terms of carbon and nitrogen removal and potential savings in aeration costs, is obtained by coupling a 6 h oxic cycle with a 6 h anoxic cycle. All reaction rates estimated in anoxic/oxic experiments remain relatively constant over the range of conditions tested.
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Information & Authors
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Published In
Journal of Environmental Engineering
Volume 125 • Issue 7 • July 1999
Pages: 602 - 607
History
Received: Sep 24, 1998
Published online: Jul 1, 1999
Published in print: Jul 1999
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