Abstract

The mechanisms controlling the accumulation of dissolved methane in anaerobic membrane bioreactors (AnMBRs) treating a synthetic dilute wastewater (a glucose medium) were assessed experimentally and theoretically. The AnMBR was maintained at a temperature of 24-26 °C as the organic loading rate increased from 0.39 to 1.1 kg COD/m<sup>3</sup>-d. The measured concentration of dissolved methane was consistently 2.2- to 2.5-fold larger than the concentration of dissolved methane at thermodynamic equilibrium with the measured CH<inf>4</inf> partial pressure, and the fraction of dissolved methane was as high as 76% of the total methane produced. The low gas production rate in the AnMBR significantly slowed the mass transport of dissolved methane to the gas phase. Although the production rate of total methane increased linearly with the COD loading rate, the concentration of dissolved methane only slightly increased with an increasing organic loading rate, because the mass-transfer rate increased by almost 5-fold as the COD loading increased from 0.39 to 1.1 kg COD/m<sup>3</sup>-d. Thus, slow mass transport kinetics exacerbated the situation in which dissolved methane accounted for a substantial fraction of the total methane generated from the AnMBR. (Graph Presented).

Original languageEnglish (US)
Pages (from-to)10366-10372
Number of pages7
JournalEnvironmental Science and Technology
Volume49
Issue number17
DOIs
StatePublished - Sep 1 2015

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Methane
mass transfer
Wastewater
Mass transfer
Gases
methane
wastewater
liquid
Liquids
gas
Bioreactors
bioreactor
membrane
Membranes
mass transport
anaerobic treatment
fold
partial pressure
gas production
Partial pressure

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry

Cite this

Contribution of Liquid/Gas Mass-Transfer Limitations to Dissolved Methane Oversaturation in Anaerobic Treatment of Dilute Wastewater. / Yeo, Hyeongu; An, Junyeong; Reid, Robertson; Rittmann, Bruce; Lee, Hyung Sool.

In: Environmental Science and Technology, Vol. 49, No. 17, 01.09.2015, p. 10366-10372.

Research output: Contribution to journalArticle

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AU - Lee, Hyung Sool

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