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Mol. Wt.

COD, g/mole

COD g/g

Carbohydrates Acetic acid Et. glycol Methanol Ethanol Butanol

C6H12O C2H4O C2H6O CH3OH C2H6O C4H10O

6

2

2

180 60 62 32 46 74

192 64 80 48 96 192

1.07 1.07 1.29 1.50 2.09 2.59

Supplemental COD Sources

WERF Studies GHG Emissions

  • WERF investigation N2O emissions from nitrification-denitrification systems.

  • NO and N2O can be released during both nitrification and denitrification

  • NO rapidly converts to NO2 which contributes to ground level ozone

  • N2O is a significant greenhouse gas with a global warming potential of 300 times that of CO2

  • Preliminary results shown highly dynamic response

  • WERF Project U4R07 Chandran, Pagilla, Katehis and Hiatt

Summary

  • There are many options for nitrification and denitrification

  • Timeswitch may be attractive for retrofit for some facilities

  • Nitrification is the rate limiting and most sensitive process

  • Denitrification can lead to high N2O emissions

  • Many choices for supplemental COD

  • Simulation is a useful tool to evaluate more alternatives, save time and effort and reduce uncertainty

  • ASMN is a new process modeling tool

  • WERF Project U4R07 is investigation N2O emissions from nitrification-denitrification systems.

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