Effects of substrate and oxygen loading rates on gas-phase toluene removal in a three-phase biofilm reactor

Haibo Yu, Byung J. Kim, Bruce Rittmann

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

A three-phase, circulating-bed biofilm reactor using macroporous carriers removed toluene from a gas stream continuously for more than six months. Three steady states were established with toluene loading rates varying from 0.030 to 0.059 mol/m2·d. For each steady state, short-term experiments evaluated the effects of toluene and oxygen loading rates. At least 99% of the biomass in the system was accumulated inside the carrier macropores, and the total biomass was proportional to the toluene loading rate. Toluene removal ranged from approximately 100 to 55%. The lower toluene removals were associated with oxygen limitation, which also resulted in the accumulation of an intermediate (3-methylcatechol) and nontoluene chemical oxygen demand. The results suggest that excessive biomass accumulation hurt process performance by depleting oxygen within the biofilm because increased endogenous respiration consumed more oxygen, while increased biomass density may have slowed oxygen diffusion.

Original languageEnglish (US)
Pages (from-to)288-294
Number of pages7
JournalWater Environment Research
Volume74
Issue number3
StatePublished - 2002
Externally publishedYes

Fingerprint

toluene
Toluene
Biofilms
biofilm
Gases
gases
Oxygen
oxygen
substrate
Biomass
Substrates
gas
biomass
macropores
chemical oxygen demand
Chemical oxygen demand
macropore
removal
rate
effect

Keywords

  • Biofilm
  • Circulating bed
  • Intermediates
  • Oxygen limitatio
  • Surface loading
  • Toluene

ASJC Scopus subject areas

  • Environmental Engineering
  • Environmental Science(all)
  • Environmental Chemistry
  • Aquatic Science
  • Water Science and Technology

Cite this

Effects of substrate and oxygen loading rates on gas-phase toluene removal in a three-phase biofilm reactor. / Yu, Haibo; Kim, Byung J.; Rittmann, Bruce.

In: Water Environment Research, Vol. 74, No. 3, 2002, p. 288-294.

Research output: Contribution to journalArticle

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