Aerobic nitrification

Most of the aerobic nitrification that occurs in natural habitats is thought to be performed by obHgately autotrophic, or in a few cases, mixotrophic, bacteria and archaea. The classical autotrophs are best known and have been assumed to be responsible for the major fluxes in this pathway, so we shall consider them first. 

Zart, D., and Bock, E. (1998). High rate of aerobic nitrification and denitrification by Nitrosomonas eutropha grown in a fermentor with complete biomass retention in the presence of gaseous NO2 or NO. Archives of Microbiology 169, 282—286. 

Nitrite is very important in N transformations because it is an intermediate product in aerobic nitrification by the bacteria Nitrosomonas and... 

In the two-stage process, nitrification occurs under aerobic conditions in the second stage. The nitrified mixed Hquor from the second stage is internally recycled to the anoxic first stage, where denitrification occurs. 

Figure 7 The production and emission of NO during denitrification in agricultural soil treated with NO3 fertilizer (KNO3) and the nitrification inhibitor Dyciandiamide (10%) under aerobic (air) and anerobic conditions (N,). Fluxes are means from three soil columns, error bars represent standard deviations from the mean. V = vertical flow through the column H = Horizontal flow over the soil surface.

The constructed wetland with the aerobic tank and anaerobic/anoxic tank connected in series was employed for the treatment of raw municipal wastewater. More than 94% of the initial BOD and 80% of the initial T-N could be removed. Successful biological nitrification was... 

The methane content of the first UASB reactor was ca. 60%. The NH4-N removal efficiency of the total system was 99.6%. Ammonium nitrogen was converted to nitrate in the aerobic system via nitrification. The BOD5/COD value obtained at the final stage was in the range 0.12 to 0.15. 

Different kinds of bioreactors and configurations have been used to treat wastewater containing formaldehyde and urea, and three different kinds of treatments can be applied anaerobic treatment, aerobic treatment, and combined nitrification and denitrification treatments. 

Annachhatre, A.P. and Bhamidimarri, S.M.R., Aerobic treatment of meat industry wastewater COD removal and nitrification, process industries power the Pacific rim Sixth conference of the Asia Pacific confederation of chemical engineering Twenty first Australasian chemical engineering conference Official proceedings of combined conference 1993 137-142, 1993. 

Steam stripping Air stripping Biological nitrification Chemical oxidation Ion exchange Solvent extraction Biological oxidation (aerobic) Wet oxidation Activated carbon Chemical oxidation Chemical precipitation Ion exchange Adsorption Nano-filtration Reverse osmosis Electrodialysis... 

N20 production in order of effect size of treatment was wastewater sludge (H-SLUDGE) > vermicomposting > wastewater sludge (L-SLUDGE) > urea > unfertilized soil. Nitrifier nitrification and nitrifier denitrification were presumably the processes that contributed the most to the production of NzO under aerobic conditions. 

Aerobic digested sludge 0.02-0.4 0.11 1 Activated sludge + nitrification/ denitrification Australia [9]... 

Aerobic The reactions carried out by Nitrosomonas and Nitrobacter (reactions b and c, autotrophic respectively) are known as nitrification, while those carried out by Beggiatoa and Thiobacillus thiooxidans (reactions d and e, respectively) are examples of sulfur oxidation ... 

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