The scales of temporal variability in the rate of ammonium oxidation and a suite of related biogeochemical parameters were investigated in the surface layer of the water column of Monterey Bay, California, on the west coast of the USA. Samples were collected on bimonthly (approx. every 2 mo) cruises during the course of 2 yr. The signal of El Niño was evident in the water column temperature and...

Partial nitrification (ammonium oxidation to nitrite) has gained a lot of interest among researchers in the last years because of its advantages with respect to complete nitrification (ammonium oxidation to nitrate): decrease of oxygen requirements for nitrification, reduction of COD demand and CO(2) emissions during denitrification and higher denitrification rate and lower biomass production d...

Treatment of 3-aminocyclohex-1-enes with mCPBA in the presence of trichloroacetic acid gives the corresponding 1,2-anti-2,3-syn-1-trichloroacetoxy-2-hydroxy-3-aminocyclohexane with high levels of diastereoselectivity (90% de). This is consistent with a mechanism of oxidation involving hydrogen-bonded delivery of the oxidant by the allylic ammonium ion formed in situ, followed by highly regiosel...

Microbial electricity-driven anoxic ammonium removal could remove from wastewater without the presence of oxygen (aeration) using electricity. This study aims at unveiling potential biologic pathways for bioelectrochemical oxidation to dinitrogen gas in an anaerobic system (BES). Known intermediate metabolites this process (hydroxylamine, nitrite and nitrate) were monitored two BES replicates. ...

Mass spectrometric analysis of gas exchange in light and dark by N-limited cells of Chlamydomonas reinhardtii indicated that ammonium assimilation was accompanied by an increase in respiratory carbon flow to provide carbon skeletons for amino acid synthesis. Tricarboxylic acid (TCA) cycle carbon flow was maintained by the oxidation of TCA cycle reductant via the mitochondrial electron transport...

Appropriate storage strategies were helpful in keeping the integrity and activity as well as in promoting the engineering application of granular sludge. The particle size distribution, composition of extracellular polymeric substances (EPSs), and activity of shortcut nitrification aerobic granular sludge (SNAGS) of the different storage strategies (15 °C with intermittent aeration, 4 °C, −20 °...

This paper reports on successful laboratory testing of a new nitrogen removal process called DEAMOX (DEnitrifying AMmonium OXidation) for the treatment of strong nitrogenous wastewater such as baker's yeast effluent. The concept of this process combines the recently discovered ANAMMOX (ANaerobic AMMonium OXidation) reaction with autotrophic denitrifying conditions using sulfide as an electron d...