Results 291 to 300 of about 59,901 (332)

Nitrification of swine waste

Canadian Journal of Microbiology, 1990
Complete oxidation of ammonia nitrogen (~1000 mg/L) to nitrite was observed in stabilized swine waste after 49 days in incubation at 400 rpm and 29 °C, only if 10% (v/v) activated sludge from a wastewater treatment unit and 1.5% (w/v) CaCO3, were added.
M, Blouin, J G, Bisaillon, R, Beaudet, M, Ishaque   +3 more
openaire   +2 more sources

Constraining the Oxygen Isotopic Composition of Nitrate Produced by Nitrification.

Environmental Science and Technology, 2019
Measurements of the stable isotope ratios of nitrogen (15N/14N) and oxygen (18O/16O) in nitrate (NO3-) enable identification of sources, dispersal, and fate of natural and contaminant NO3- in aquatic environments.
Danielle S Boshers, J. Granger, C. Tobias, J. Böhlke, Richard L. Smith   +4 more
semanticscholar   +1 more source

Nitrification in Paleocene Shale

Science, 1974
Exchangeable ammonium nitrogen is present in Paleocene (Fort Union) shale below a depth of 10 meters in North Dakota and eastern Montana. Above 10 meters, exchangeable ammonium nitrogen is nitrified in situ. The lack of viable nitrifying organisms and the probable lack of oxygen prevent in situ nitrification below 10 meters.
J F, Power, J J, Bond, F M, Sandoval, W O, Willis   +3 more
openaire   +2 more sources

A review of research progress of heterotrophic nitrification and aerobic denitrification microorganisms (HNADMs).

Science of the Total Environment, 2021
Tao Song, Xiaolei Zhang, Ji Li, Xinyu Wu, Haixia Feng, Wen-yi Dong   +5 more
semanticscholar   +1 more source

Kinetics of biofilm nitrification

Biotechnology and Bioengineering, 1982
AbstractThe reaction rates (r and r) in the two‐step nitrification reaction were measured in a fluidized‐sand‐bed biofilm reactor under a range of steady‐state conditions with respect to bulk NH, NO, and O2 concentrations. It was shown from theory and experiment that under low NH concentration conditions, if the O2/NH concentration ratio in the bulk ...
H, Tanaka, I J, Dunn
openaire   +2 more sources

Enrichment of high activity nitrifers to enhance partial nitrification process

Bioresource Technology, 2010
Partial nitrification (PN) process is an essential pre-treatment to Anammox process for nitrogen removal from ammonium-rich wastewaters. High activity nitrifiers (HANs) are considered as the key to high-rate PN process. The HANs could be successfully enriched at free ammonia (FA) concentrations of 10-20 mg NH(3)-NL(-1), which differed significantly ...
Jianwei, Chen, Ping, Zheng, Yi, Yu, Qaisar, Mahmood, Chongjian, Tang   +4 more
openaire   +2 more sources

Nitrification potential curves: a new strategy for nitrification prevention

Journal AWWA, 2005
In this article, nitrification potential curves are introduced as a possible operational strategy to prevent nitrification in chloraminated distribution systems. Nitrification potential curves are constructed based on the parameters that define growth and inactivation kinetics of ammoniaoxidizing bacteria in environments that contain chloramine and ...
Kala K. Fleming, Gregory W. Harrington, Daniel R. Noguera   +2 more
openaire   +1 more source

Biological inhibition of soil nitrification by forest tree species affects Nitrobacter populations.

Environmental Microbiology, 2019
Some temperate tree species are associated with very low soil nitrification rates, with important implications for forest N dynamics, presumably due to their potential for biological nitrification inhibition (BNI).
Amandine Laffite, A. Florio, K. Andrianarisoa, C. Creuzé des Châtelliers, Brigitte Schloter‐Hai, Sidy M. Ndaw, Charlotte Periot, M. Schloter, B. Zeller, F. Poly, X. Le Roux   +10 more
semanticscholar   +1 more source

Simulated distribution nitrification: Nitrification Index evaluation and viable AOB

Journal AWWA, 2013
Lab‐scale reactors were used to evaluate the impact of simultaneously increasing temporal influent monochloramine (NH2Cl) concentrations (0.0 to 3.2 mg/L Cl2) and chlorine‐to‐nitrogen mass ratios (0:1 to 3.2:1) on nitrification, allowing evaluation of the recently proposed Nitrification Index (NI) for chloraminated drinking water distribution system ...
Karen A. Schrantz, Jonathan G. Pressman, David G. Wahman   +2 more
openaire   +1 more source

Symbiotic Aspects of Nitrification

Nature, 1946
IN an interesting article on the symbiosis between myxobacteria and nitrifying bacteria, Imsenecki1 describes an observation which he made during his studies on the biology of myxobacteria, when he was able to isolate from a culture of Nitrosomonas, grown in its elective medium, a heterotrophic organism which he has named Sorangium symbioticum.
openaire   +2 more sources