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- Title
Nitrification-Denitrification Biological Treatment of a High-Nitrogen Waste Stream for Water-Reuse Applications.
- Authors
Jacksonh, W. Andrew; Morse, Audra; McLamore, Eric; Wiesner, Ted; Shu Xia
- Abstract
This research was. conducted to evaluate the use of biological nitrification-denitrification systems as pre-processors for recycling wastewater to potable water in support of space exploration. A packed-bed bioreactor and membrane-aerated nitrification reactor were operated in series with a 10:1 recycle ratio over varying loading rates. The dissolved organic carbon (DOC) removal exceeded 80% for all loading rates (θ = 1 to 6.8 days), while total nitrogen removal generally increased with decreasing retention time, with a maximum removal of 55%. The degree of nitrification generally declined with decreasing retention time from a high of 80% to a low of 60%. Maximum DOC and total nitrogen volumetric removal rates exceeded 1000 and 800 g/m3·d, respectively, and maximum nitrification volumetric conversion rates exceeded 300 g/m3·d. At low hydraulic loading rates, the system was stoichiometrically limited, while kinetic limitations dominated at high hydraulic loading rates. Incomplete nitrification occurred at high loading rates, likely as a result of the high pH and large concentrations of ammonia.
- Subjects
NITRIFICATION; DENITRIFICATION; WASTEWATER treatment; WATER quality management; NITROGEN compounds &; the environment; WATER reuse; NITRIFYING bacteria; HYDROGEN-ion concentration; AMMONIA
- Publication
Water Environment Research (10614303), 2009, Vol 81, Issue 4, p423
- ISSN
1061-4303
- Publication type
Article
- DOI
10.2175/106143008X370485