Titre :
|
The effect of sludge age on the deterioration of the enhanced biological phosphorus removal process
|
Auteurs :
|
M. Rodrigo ;
A. Seco ;
J. Ferrer ;
AL Et
|
Type de document :
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article/chapitre/communication
|
Année de publication :
|
1999
|
Format :
|
p. 1055-1063
|
Langues:
|
= Anglais
|
Catégories :
|
TRAITEMENT DE L'EAU RESIDUAIRE
|
Mots-clés:
|
TRAITEMENT BIOLOGIQUE DE L'EAU
;
DEPHOSPHATATION
;
BACTERIE
;
BOUES ACTIVEES
|
Résumé :
|
Deterioration of the enhanced biological phosphorus removal process has been reported during recent years by many authors, and is frequently imputed to the development and domination in the biological culture of non phosphate accumulating organisms (commonly known as G bacteria ). In this paper, the relationship between the dominant organism in an anaerobic-aerobic activated sludge process and sludge age is studied. It has been observed that the deterioration of enhanced biological phosphorus removal does not depend only on wastewater composition, but the age of the sludge is also of major importance. Thus, for the same wastewater composition results show how the phosphate accumulating organisms can only dominate under low sludge age conditions, and their fraction decreases with an increase in sludge age. To obtain this conclusion the stoichiometrical coefficients between phosphorus release, CO production and volatile fatty acid uptaken were used in combination with commonly accepted metabolic paths for polyphosphate accumulating organisms and G bacteria.
|
Source :
|
Environmental technology, vol.20, n°10
|