Tesis doctoral de Albert Bartroli Almera
Partial nitrification of a high-strength ammonium wastewater was studied in this thesis. Partial nitrification is the oxidation of ammonium to nitrite, but not to nitrate. To achieve partial nitrification, the subsequent oxidation of nitrite must be prevented. This shortcut in the biological ammonium removal process has several advantages with respect to the complete nitrification (ammonium oxidation to nitrate): (i) a 40% reduction of organic matter demand during denitrification; (ii) 63% higher rate of denitrification; and (iii) 300% lower biomass production during anoxic growth. The main factors affecting ammonium-oxidizing (aob) and nitrite-oxidizing bacteria (nob) activities in a different degree and useful to achieve partial nitrification are temperature, ph and nutrient concentrations. first the pilot plant used in this thesis was designed and built. The pilot plant consisted on two airlift reactors of 127 l of volume each one, equipped with dissolved oxygen (do), ph, temperature and tan (nh3 + nh4+) probes. These probes were connected to a data acquisition platform which also was connected to a process computer for control and monitoring purposes. in the first period of operation, a specific control strategy to achieve and maintain full partial nitrification to nitrite (100% conversion of tan to nitrite) was designed. The control strategy is an advanced control technique, a ratio control, in which a ratio of do to tan concentrations in the reactor are set to provide the necessary oxygen limiting conditions to obtain full partial nitrification. this strategy was firstly tested manually using off-line measurements of tan concentration in the reactor. After a successful trial, the control loop was closed automatically and linked to the oxygen control loop. This strategy has been named automatic control for partial nitrification to nitrite in biofilm reactors (anfibio®). The oxygen limiting conditions required for full partial nitrification were explored under automatically controlled conditions, through anfibio®. The minimal oxygen limiting conditions were estimated to be in the range 0.25
- Título de la tesis: Partial nitrification with a continuous biofilm airlift reactor of a high-strength ammonium wastewater
- Autor: Albert Bartroli Almera
- Universidad: Autónoma de barcelona
- Fecha de lectura de la tesis: 29/01/2010
Dirección y tribunal
- Director de la tesis
- Julian Carrera Muyo
- Tribunal
- Presidente del tribunal: ramón Méndez pampín
- Jesús Colprim galcerán (vocal)
- (vocal)
- (vocal)