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- W1986571822 abstract "The urban wastewater treatment plants of the 21st century will have to consider the removal of the carbon, nitrogen and phosphorus. On one hand, the usual exogenous carbon source for tertiary treatment are generally supplied as methanol, ethanol, acetic acid, etc. On the other hand, the anaerobic wastewater treatment plant produces a biogas which contains up to 90 % of methane and which could be used as a cheap carbon source for denitrification. The first step of this work conducted in batch culture with or without copper, has shown that a consortium of methanotrophic and denitrifying bacteria are involved in this process. The methanotrophic bacteria oxidises methane under aerobic conditions via a specific enzyme (Methane Mono Oxygenase) and produces a soluble organic carbon in the liquid phase available for the denitrification. During the batch culture, when dissolved oxygen concentration decreases below 1 mg/l, a maximum denitrification rate of 3.3 mg N-NO 3 /l.h was obtained with 80 μg/l of copper in the medium. The consumption rate of methane was 3.5 mmol CH 4 /l.h. The molar ratio of the oxygen/methane consumed was 1.27, and the mass ratio of C-CH 4 consumed to N-NO 3 eliminated was 10.9. During chemostat culture, denitrification on synthetic and real nitrifying water was tested. The stability of the consortium has been verified under different culture conditions. The variation of the dilution rate showed that the maximum one was 0.16 h −1 . The specific denitrification rate obtained with synthetic and real water were respectively 6.1 and 9.47 mg N-NO 3 /TSS.h, with a C/N mass ratio of 3.6 and 4.6. In chemostat, culture the efficiency of the methane oxidation and the denitrification was improved." @default.
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- W1986571822 date "1999-01-01" @default.
- W1986571822 modified "2023-09-27" @default.
- W1986571822 title "An alternative use of biogas applied at the water denitrification" @default.
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- W1986571822 doi "https://doi.org/10.1016/s0273-1223(99)00616-2" @default.
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