Applying real-time control for achieving nitrogen removal via nitrite in a lab-scale CAST system.
Environ Technol
; 33(10-12): 1133-40, 2012 Jun.
Article
em En
| MEDLINE
| ID: mdl-22856282
ABSTRACT
In this study, a bench-scale Cyclic Activated Sludge Technology (CAST) reactor (72?L), fed with domestic sewage, was operated in alternating anoxi-aerobic operation mode to investigate the feasibility of achieving short-cut nitrification and denitrification with a real-time control strategy. An online system for controlling the length of the aeration and stirring phases was implemented, based on pH and oxidation-reduction potential signals, to switch between aerobic and anoxic sequences. Results show that the real-time control strategy was successful in achieving a stable nitrogen removal performance. Furthermore, short-cut nitrification can be achieved by controlling aeration length under the modified real-time control strategy. Gradually reducing the energy supply for nitrite-oxidizing bacteria caused the limitation of their growth and, finally, their elimination. When short-cut nitrification was obtained, the nitrite pathway became the primary way for nitrogen removal, and aeration duration was reduced by 28.4%.
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Base de dados:
MEDLINE
Assunto principal:
Reatores Biológicos
/
Nitritos
/
Nitrogênio
Tipo de estudo:
Evaluation_studies
Idioma:
En
Ano de publicação:
2012
Tipo de documento:
Article