PMID: 8580647Jan 1, 1995Paper

Simultaneous NH3 oxidation and N2 production at reduced O2 tensions by sewage sludge subcultured with chemolithotrophic medium

Biodegradation
E B MullerH W van Verseveld

Abstract

The ammonia oxidation rate by sewage sludge was determined as a function of the dissolved oxygen tension. Samples of sludge were taken from a domestic waste water treatment pilot plant in which sludge was completely retained by membrane filtration. The samples were subcultured chemolithotrophically in recycling reactors. The gas supplied was a mixture of pure argon and oxygen. The KO2 for ammonia oxidation was estimated to be 0.97 (+/- 0.16) kPa dissolved oxygen. Together with ammonia oxidation and oxygen consumption, dinitrogen gas was produced. So, aerobic denitrification occurred. At dissolved oxygen tensions of 1.25 kPa and higher, the dinitrogen production rate (per N-mole) equalled 20% of the ammonia oxidation rate. This proportion was even 58% at 0.3 kPa dissolved oxygen. At 0.15 kPa dissolved oxygen, however, nitrification hardly proceeded, while dinitrogen production soon stopped. Most likely, a nitrifier concomitantly oxidized ammonia and reduced nitrite to dinitrogen.

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Citations

May 5, 2005·Journal of Industrial Microbiology & Biotechnology·Ebtesam El-BestawyMohamed Fahmy El-Saka
Sep 27, 2003·Journal of Biotechnology·Am JangPaul L Bishop
Oct 11, 2003·Biotechnology Advances·B B Colliver, T Stephenson
Aug 18, 2005·Environmental Microbiology·Armin GiesekeDirk de Beer
Jul 13, 2006·Journal of Environmental Science and Health. Part A, Toxic/hazardous Substances & Environmental Engineering·K S RoM E Poach
Feb 7, 2007·Journal of Environmental Sciences (China)·Shou-you GaoJun Yan
Apr 26, 2003·Environmental Microbiology·Armin GiesekeRudolf Amann
Mar 2, 2002·Applied and Environmental Microbiology·Jonathan P Zehr, Bess B Ward
Oct 31, 1998·Applied and Environmental Microbiology·L Kuai, W Verstraete

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