Modeling of membrane-aerated biofilm: Effects of C/N ratio, biofilm thickness and surface loading of oxygen on feasibility of simultaneous nitrification and denitrification

Shinya Matsumoto, Akihiko Terada, Satoshi Tsuneda

Research output: Contribution to journalArticle

94 Citations (Scopus)

Abstract

A multipopulation model of a membrane-aerated biofilm (MAB) considering heterotrophic bacteria (HB), ammonia-oxidizing bacteria (AOB), and nitrite-oxidizing bacteria (NOB) was constructed with the simulation software AQUASIM 2.1 to corroborate the process concept of the membrane-aerated biofilm reactor (MABR) and to reveal an operational range for high chemical oxygen demand (COD) and nitrogen removal efficiencies. The modeling results confirm that simultaneous nitrification and denitrification (SND) is feasible in the MAB but not in a top-down aerated biofilm (conventional biofilm) due to the absence of oxygen for AOB and NOB. The model precisely predicts the COD, NH4+-N, and T-N removal efficiencies and determines operating parameters like COD/nitrogen (C/N) ratio, biofilm thickness and surface loading of oxygen, which significantly affect SND efficiency. High nitrogen removal efficiency (more than 70%) is attained at ranges of C/N ratio from 3.0 to 5.25 and of biofilm thickness from 600 to 1200 μm. In addition, it was clearly demonstrated that nitrogen removal not via nitrate but via nitrite could be achieved by controlling the relative surface loadings of oxygen and ammonia, supporting the feasibility of short-cut SND with MABs.

Original languageEnglish
Pages (from-to)98-107
Number of pages10
JournalBiochemical Engineering Journal
Volume37
Issue number1
DOIs
Publication statusPublished - 2007 Oct 15

Keywords

  • AQUASIM
  • Biofilm modeling
  • Membrane-aerated biofilm (MAB)
  • Simultaneous nitrification and denitrification (SND)

ASJC Scopus subject areas

  • Biotechnology
  • Environmental Engineering
  • Bioengineering
  • Biomedical Engineering

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