Abstract

We tested the selective inhibition of methanogens at high NH 4 +-N concentrations (> 4 g/L), which led to an increased Coulombic efficiency (CE) in the anode of a continuous ethanol-fed (12mM influent) microbial electrolysis cell (MEC). We obtained optimum results using 6 g/L NH 4-N by doubling the CE from 10% to 20%, compared to the control tests (0.4 g/L NH 4 +-N), at a short HRT of 5.4 hours. The increase in CE at 6 g/L NH 4-N was accompanied by accumulation of acetate (7 mM versus 2 mM in the control), which suggests a positive syntrophic role of homo-acetogens. Inhibitory effects of NH 4 +-N (at 8 g/L) to a batch homo-acetogenic culture was minimal, confirming their positive role as H 2 scavengers in the MEC anode. This work supports that high NH 4 +-N wastes provide an additional benefit to manage anode microbial communities fed with fermentable substrates for higher CE.

Original languageEnglish (US)
Title of host publicationACS National Meeting Book of Abstracts
StatePublished - 2011
Event241st ACS National Meeting and Exposition - Anaheim, CA, United States
Duration: Mar 27 2011Mar 31 2011

Other

Other241st ACS National Meeting and Exposition
CountryUnited States
CityAnaheim, CA
Period3/27/113/31/11

Fingerprint

Biofilms
Ammonium Compounds
Anodes
Regenerative fuel cells
Substrates
Methanogens
Acetates
Ethanol

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

Cite this

Effect of high concentrations of ammonium-N on biofilm anode fed with a fermentable substrate. / Parameswaran, Prathap; Torres, Cesar; Krajmalnik-Brown, Rosa; Rittmann, Bruce.

ACS National Meeting Book of Abstracts. 2011.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Parameswaran, P, Torres, C, Krajmalnik-Brown, R & Rittmann, B 2011, Effect of high concentrations of ammonium-N on biofilm anode fed with a fermentable substrate. in ACS National Meeting Book of Abstracts. 241st ACS National Meeting and Exposition, Anaheim, CA, United States, 3/27/11.
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