Authors: Hiatt, William C; Grady, C. P. Leslie

Source: Water Environment Research, Volume 80, Number 11, November 2008 , pp. 2134-2144(11)

Publisher: Water Environment Federation

Abstract:

The Activated Sludge Model for Nitrogen (ASMN) was evaluated by conducting simulations under both steady-state and dynamic conditions using a wastewater containing high concentrations of chemical oxygen demand (COD) and nitrogen, and an inhibitor of ammonia-oxidizing bacteria. The adopted wastewater characteristics were based on data from several industrial wastewater treatment facilities. The simulations were performed at a variety of temperatures, solids retention times, dissolved oxygen concentrations, pH values, and salt concentrations. The nitrification operating window was defined, and denitrification performance was characterized. The pH and temperature were found to be the most important variables affecting nitrification performance under upset or startup conditions, with lower pH values allowing better performance at higher temperatures for the high-nitrogen wastewater used in the simulations. Emissions of nitric oxide and nitrous oxide were higher than generally thought to occur and were directly linked to depletion of the electron donor in the anoxic reactor. The findings concerning pH, temperature, and gaseous emissions were all consistent with the known growth characteristics of nitrifying and denitrifying bacteria. Parameter and process variable sensitivity studies were performed, and guidelines for improved biological nitrogen removal were developed.

Keywords: nitrification; denitrification; modeling; Activated Sludge Model for Nitrogen; parameters; pH; temperature; inhibition; free ammonia; free nitrous acid

Document Type: Research article

DOI: http://dx.doi.org/10.2175/106143008X304767

Publication date: 2008-11-01

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• Water Environment Research® (WER®) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year.
  
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