Formaldehyde biodegradation and its effect on the denitrification process
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Formaldehyde biodegradation and its effect on the denitrification processData
2007Cita bibliográfica
Eiroa M, Vilar A, Kennes C, Veiga MC. Formaldehyde biodegradation and its effect on the denitrification process. Environ Technol. 2007;28(9):1027-33
Resumo
Simultaneous formaldehyde biodegradation and denitrification in batch assays and in a continuous lab-scale reactor were studied. In batch assays, initial biodegradation rates between 0.7 and 3.3 g CH2O g VSS-1 d-1 were obtained at formaldehyde concentrations between 300 and 2150 mg l-1. The denitrification process was affected by the presence of formaldehyde. The nitrite accumulation increased with the initial formaldehyde concentration. In the continuous reactor, removal efficiencies above 98.5% were obtained at formaldehyde loading rates between 0.37 and 2.96 kg COD m-3 d-1 (625 - 5000 mg CH2O l-1). Formaldehyde removal led to the appearance of methanol and formic acid in the medium. Denitrification process was almost complete (around 99.7%) at nitrogen loading rates up to 0.44kg N-NO3- m-3 d-1. Nitrite occasionally appeared in the effluent at concentrations less than 2.9 mg l-1. The composition of the biogas indicated that denitrification and methanogenesis occurred simultaneously in the same unit.
Palabras chave
Formaldehyde
Biodegradation
Denitrification
Biodegradation
Denitrification
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Dereitos
This is an Accepted Manuscript of an article published by Taylor & Francis Group in Environmental Technologie on 2007, available online at: http://www.tandfonline.com/10.1080/09593332808618864.