Simultaneous nitrification and formaldehyde biodegradation in an activated sludge unit
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Simultaneous nitrification and formaldehyde biodegradation in an activated sludge unitData
2005-11Cita bibliográfica
Eiroa M, Kennes C, Veiga MC. Simultaneous nitrification and formaldehyde biodegradation in an activated sludge unit. Bioresour Technol. 2005;96(17):1914-8.
Resumo
The simultaneous removal of formaldehyde and ammonium in a lab-scale activated sludge unit was investigated. The unit was operated at a hydraulic retention time of 2.4 days with an ammonium concentration in the influent of 350 mg 〖NH〗_4^+-N/L, maintaining the ammonium loading rate at 0.15 g 〖NH〗_4^+-N/L d during the operation time. However, the applied organic loading rate was increased stepwise by increasing the formaldehyde concentration from 26 up to 3168 mg/L, corresponding to 0.01–1.40 g COD/L d. High formaldehyde removal efficiencies, around 99.5% (±0.38), were maintained at all the formaldehyde concentrations. Ammonium removal was also very high during the operation period, around 99.9% (±0.01). The ammonium concentration in the effluent was lower than 0.1 mg 〖NH〗_4^+-N/L at all applied organic loading rates, indicating that there was no inhibition of nitrification by formaldehyde.
Palabras chave
Formaldehyde
Ammonium
Aerobic biodegradation
Nitrification
Activated sludge reactor
Ammonium
Aerobic biodegradation
Nitrification
Activated sludge reactor