Spatial variability of anaerobic processes and wastewater pH in force mains

Elise Alice Rudelle, Asbjørn Haaning Nielsen, Thorkild Hvitved-Jacobsen, Henriette Stokbro Jensen, Jes Vollertsen

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

4 Citationer (Scopus)

Abstract

The present study focuses on anaerobic organic matter transformation processes in force mains for the purpose of improving existing sewer process models. Wastewater samples were obtained at 100 m intervals from a 1 km long pilot scale force main and measured for several wastewater parameters. Transformation rates for selected parameters were calculated and their spatial variability analyzed. In terms of electron transfer, fermentation was the most significant process, resulting in a net volatile fatty acid formation of 0.83 mmol/L. Sulfate reduction resulted in a production of 0.73 mmol/L of inorganic sulfide. Methanogenesis was negligable in all experiments despite an anaerobic residence time of more than 30 hours. As a result of the anaerobic processes, the wastewater pH decreased by approximately one pH unit, resulting in a corresponding increase in the fraction of molecular hydrogen sulfide. A significant spatial variablilty was observed for the average transformation rates of all parameters.
OriginalsprogEngelsk
TidsskriftWater Environment Research
Vol/bind88
Udgave nummer8
Sider (fra-til)747-755
ISSN1061-4303
DOI
StatusUdgivet - 2016

Emneord

  • Alkalinity
  • Anaerobic processes
  • Fermentation
  • Odor
  • Sulfate reduction

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