Biological Wastewater Treatment in Reactors with Fibrous Packing
Publication: Journal of Environmental Engineering
Volume 119, Issue 5
Abstract
Three sets of experiments were conducted to study the effects of hydraulic retention time (HRT), elevated ammonium nitrogen concentration and system breakdown on the removal of chemical oxygen demand (COD) and nitrogen in wastewater. Each set of experiments was conducted in parallel using three 21.7‐L reactors with submerged fibrous packing. One reactor was aerated continuously, and the other two were aerated half the time intermittently. When tested with synthetic wastewater having an average COD of 958 mg/L and of 94 mg/L at 4–14 hr of HRT, all reactors had similar levels of carbonaceous oxidation (95–97%) and nitrification (85%). The nitrite/nitrate produced were effectively denitrified in the intermittently aerated reactors because of the anoxic condition in the interior of the “bio‐pompons”; but the continuously aerated reactor had little denitrification activity. Elevated concentrations were toxic to microorganisms in all reactors, affecting adversely both the nitrification and carbonaceous oxidation. Nitrification was affected more in the intermittently aerated reactors; and carbonaceous oxidation was affected more in the continuously aerated reactor. All reactors showed rapid recovery from a simulated system breakdown.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 119 • Issue 5 • September 1993
Pages: 946 - 957
Copyright
Copyright © 1993 American Society of Civil Engineers.
History
Received: Mar 9, 1992
Published online: Sep 1, 1993
Published in print: Sep 1993
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