Nitrite removal by a fixed culture in a submerged granular biofilter

Rahmani, Hossein A.; Rols, Jean‐Luc; Capdeville, B.; Cornier, J. C.; Déguin, A.

doi:10.1016/0043-1354(94)00324-z

Cited by 31 publications

(10 citation statements)

References 8 publications

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“…For this purpose, the packing was loosened by means of water and air in cross-current, first by a constant flow of air (80 m/h) and secondly, by a rising flow of water (30 m/h) and air (60 m/h) for 1 min. Finally, a constant rising flow of water (20 m/h) was applied for 2 min to eliminate the remaining biofilm [13]. The concentration of suspended solids in the discharge from the washing was also monitored in order to determine differences in biomass between the columns.…”

Section: Methodsmentioning

confidence: 99%

Biological nitrogen and phenol removal from saline industrial wastewater by submerged fixed-film reactor

Ramos

Gómez

Hontoria

et al. 2007

Journal of Hazardous Materials

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Section: Methodsmentioning

confidence: 99%

Biological nitrogen and phenol removal from saline industrial wastewater by submerged fixed-film reactor

Ramos

Gómez

Hontoria

et al. 2007

Journal of Hazardous Materials

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“…and secondly by a constant rising flow of water (50 m/h) and air (70 m/h) for 10 min. A steady rising flow of water was applied for 5 min to eliminate the remaining biofilm [16].…”

Section: Pilot-plant Submerged Filtermentioning

confidence: 99%

Inoculation of a submerged filter for biological denitrification of nitrate polluted groundwater: a comparative study

Moreno

Gómez

González‐López

et al. 2005

Journal of Hazardous Materials

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“…C'est d'ailleurs avec ce type de procédé qu'ABE-LING et SEYFRIED (1992) ont validé ce nouveau concept de traitement sur un pilote semi-industriel. Quant à l'étape de dénitritation qui permet de réduire les nitrites en azote (N 2 ), elle peut être réalisée par des procédés à cultures libres ou fixées (RAHMANI et al, 1995). De plus, cette filière de traitement de l'azote est plus particulièrement destinée aux effluents chargés en azote ([N-NH4] > 100 mgN/l).…”

Section: -Conclusionunclassified

Étude du processus de nitratation avec des boues activées : effet inhibiteur de l'ammoniac sur les bactéries nitratantes

Vazquez-Rodriguez¹,

Rolst²

2005

rseau

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Cet article porte sur l'étude de la réaction de nitratation (oxydation de nitrites en nitrates) par voie biologique aérobie avec des bactéries autotrophes nitratantes. Les phénomènes d'inhibition de l'ammoniac sur l'activité nitratante de populations microbiennes issues de boues activées (populations mixtes ou enrichies en bactéries nitratantes) ont été caractérisés.A l'aide d'une méthodologie faisant appel à la respirométrie, les caractéristiques de la population enrichie ont été définies :- les conditions optimales de mise en oeuvre sont un pH de 7,8 et une température de 29·C- les paramètres cinétiques définissant les performances sont QSmax=61 mgN-NO2-/gMVS×h et KS=3,04 mgN-NO2-/l- cette population présente une bonne tolérance vis-à-vis de NH3, une inhibition de 60% de la respiration des bactéries nitratantes ayant été obtenue pour 11,4 mgN-NH3/l.Les mêmes effets inhibiteurs ont été observés lors de la mise en culture discontinue de populations mixtes dans les conditions optimales de pH et température. Dans ces conditions de mise en oeuvre, différentes cultures dont les concentrations en biomasse totale ont varié de 0,1 à 2 gMVS/l, en présence de 3 mgN-NH3/l, ont présenté la même vitesse spécifique de nitratation. Ces phénomènes d'inhibition de la nitratation par NH3 paraissent complexes et fortement dépendant de facteurs environnementaux qui agissent sur la dynamique de croissance de ces bactéries.This paper focuses both on nitrification and on inhibition by ammonia of the bacteria responsible for this process in activated sludge (nitrifying bacteria). Nitrification (autotrophic nitrite oxidation to nitrate) is the limiting step in wastewater treatment plants during nitrogen biological treatment (ammonia is known as the major inhibitor). To assess the effects of environmental conditions on nitrification, respirometric measurements of a nitrifying bacteria-enriched activated sludge were carried out using a chemostat providing a stable nitrite-oxidizing population. The influence of pH, temperature, and the free ammonia concentration [NH3-N] was studied. The maximum activity of the nitrifying bacteria was found at pH 7.8 and at 29 oC, with the 90% range of maximum activity lying between pH values of 7.5 and 8.1. Activation and deactivation energies for nitrification were estimated by Arrhenius analysis to be 12.2 and - 41.5 kcal/mol, respectively. A Q10 value (multiplicative factor of oxygen consumption rate for each 10oC increase) of 2.8 was determined. Saturation or half-velocity coefficient (Ks) and maximum specific rate of nitrite oxidation (QSmax) were calculated by respirometric measurements, and are 3.04 mg NO2--N/l and 61 mg NO2--N/g VSS.h, respectively. In the study of effect of free ammonia, respirometric measurements were performed at ammonia concentrations ranging from 0.1 to 70 mg NH3-N/l. For a concentration of 11.4 mg NH3-N/l, a nitrification inhibition degree of 60% was reached. Contrary to the work of Anthonisen et al. (1976), which showed total inhibition of nitrifying bacteria at a concentrat...

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Nitrite removal by a fixed culture in a submerged granular biofilter

Cited by 31 publications

References 8 publications

Biological nitrogen and phenol removal from saline industrial wastewater by submerged fixed-film reactor

Biological nitrogen and phenol removal from saline industrial wastewater by submerged fixed-film reactor

Inoculation of a submerged filter for biological denitrification of nitrate polluted groundwater: a comparative study

Étude du processus de nitratation avec des boues activées : effet inhibiteur de l'ammoniac sur les bactéries nitratantes

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