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Denitrification Limitations

Not all heterotrophs conduct denitrification

Many denitrifying microorganisms are incomplete denitrifiers

Insufficient organic substrate leads to release of significant amounts of NO and N2O

Methanol is a the most common supplemental organic carbon source for denitrification.

Metabolically, methanol is a poor choice due to a very limited number of microorganisms that can utilize methanol.

NH3 mg N/L 0.5-16

NO3 mg N/L 0-25

MEOH T/day 3.9

0.5-12 0.5-8 0.5-3.5 1.3-1.8 1.5-1.7

0-20 0-13 0-7 0-3 0.5-0.7

4 4 4 4.4 4.9

Timeswitch Simulation Results

Air on/off, hours

4/4 3/3 2/2 1/1

    • 0.5

      /0.5

    • 0.25

      /0.25

Simulation results obtained from SIMBA computer program (ifak, Germany), using the ASM1 Process Model

ASMN Activated Sludge Model-Nitrogen

“An Updated Process Model for Carbon Oxidation, Nitrification and Denitrification” William C.. Hiatt and C.. P.. Leslie Grady, Jr.., Water Environment Research (80) 2145--2156, 2008..

“Application of the Activated Sludge Model for Nitrogen to Elevated Nitrogen Conditions” William C.. Hiatt and C.. P.. Leslie Grady, Jr.., Water Environment Research (80) 2134--2144, 2008..

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