Formaldehyde biodegradation and its inhibitory effect on nitrification
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Formaldehyde biodegradation and its inhibitory effect on nitrificationDate
2004-05Citation
Eiroa M, Kennes C, Veiga MC. Formaldehyde biodegradation and its inhibitory effect on nitrification. Journal of Chemical Technology and Biotechnology. 2004;79(5):499-504.
Abstract
The simultaneous removal of formaldehyde and ammonium in aerobic cultures and the inhibitory effect of formaldehyde on ammonium oxidation were investigated. The influence of a co-substrate, methanol, on formaldehyde biodegradation and on the nitrification process was also evaluated. Formaldehyde was completely removed at all concentrations tested (30–3890 mg dm−3) in assays with that compound as the single carbon source and in the presence of methanol as co-substrate. An initial formaldehyde biodegradation rate of 4.6 g CH2O g−1 VSS d−1 was obtained for 2000 mg CH2O dm−3 as single carbon source compared with a rate of 7.3 g CH2O g−1 VSS d−1 when methanol was added. Formaldehyde was inhibitory to the nitrification process at initial concentrations higher than 350 mg dm−3. Increasing the initial formaldehyde concentration or adding a co-substrate such as methanol resulted in a longer lag phase before ammonium oxidation and caused a decrease in the degree of nitrification. Nitrification was completely inhibited at initial formaldehyde concentrations higher than 1500 mg dm−3.
Keywords
Formaldehyde
Methanol
Ammonium
Toxicity
Nitrification
Methanol
Ammonium
Toxicity
Nitrification
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