Treatment efficiency and stoichiometry of a high-strength graywater

Audra Morse, Sukrut Khatri, W. Andrew Jackson

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


The transit mission wastewater may represent a future graywater, in which toilet waste is separated from other household waste streams, and dilution water is minimal. A loading rate study indicated that denitrification is stoichiometrically limited, and nitrification was kinetically limited. Denitrification stoichiometry was developed by deriving hypothetical molecular formulas of organic carbon inputs to be represented by the relative proportions of carbon, hydrogen, oxygen, and nitrogen. The derived stoichiometry was validated against experimental data by adjusting the values of fe and fs and multiplying the total dissolved organic carbon loss across the system by the overall R equation and then comparing the total nitrogen removed in the reaction to experimentally observed total nitrogen removal. The nitrification stoichiometry was similarly validated by multiplying the R equation by the ammonium-nitrogen removed and then comparing the NO x-N formed in the equation to actual NOx-N production values. The fs values for the denitrifying and nitrifying bacteria were 0.33 and 0.15, respectively.

Original languageEnglish
Pages (from-to)2557-2563
Number of pages7
JournalWater Environment Research
Issue number13
StatePublished - Dec 2007


  • Denitrification
  • Graywater
  • Loading rates
  • Nitrification
  • Stoichiometry


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