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- Title
Effect of Short-term Exposure of Selected Aromatic Nitrogen Compounds on Wastewater Treatment.
- Authors
Jia Guo; Sims, Atreyee; Gajaraj, Shashikanth; Donglei Wu; Zhiqiang Hu
- Abstract
The biodegradation of melamine and p-nitrophenol (PNP) and their impact on wastewater treatment was evaluated after a short-term individual chemical loading in activated sludge treatment systems. Melamine was not degraded and quickly washed out of the system. PNP was degraded, but it led to a prolonged period of nitrification inhibition and deterioration of effluent quality. Both melamine and PNP loadings increased the effluent nitrogen concentrations, with their main contributors being melamine and NH4+, respectively. Nitrosomonas and Nitrospira were dominant in the activated sludge. Melamine did not affect the nitrifying assemblages, whereas PNP led to a reduced Nitrosomonas population size and complete washout of Nitrobacter. The results suggest that melamine is an inert compound if it enters the treatment facility for a short duration. Although the short-term exposure of melamine or PNP decreased effluent water quality, the impact of such aromatic nitrogen compounds on wastewater treatment performance may vary significantly.
- Subjects
MELAMINE; NITROPHENOLS; NITROGEN compound synthesis; WASTEWATER treatment -- Environmental aspects; SEWAGE purification
- Publication
Water Environment Research (10614303), 2014, Vol 86, Issue 11, p2166
- ISSN
1061-4303
- Publication type
Article
- DOI
10.2175/106143014X14062131178312