Enhancement of biofilm formation onto surface-modified hollow-fiber membranes and its application to a membrane-aerated biofilm reactor

A. Terada, T. Yamamoto, K. Hibiya, S. Tsuneda, A. Hirata

Research output: Contribution to journalArticlepeer-review

40 Citations (Scopus)

Abstract

Surface-modified hollow-fiber membranes were prepared by radiation-induced grafting of an epoxy-group-containing monomer, glycidylmethacrylate (GMA), onto a polyethylene-based fiber (PE-fiber). The epoxy ring of GMA was opened by introduction of diethylamine (DEA). The bacterial adhesivity to this material (DEA-fiber) was tested by immersion into a nitrifying bacterial suspension. The initial adhesion rates and the amount of attached bacteria of the DEA-fiber were 6-10-fold and 3-fold greater than those of the PE fiber, respectively. A membrane-aerated biofilm reactor (MABR) composed of DEA fibers was developed for partial nitrification with nitrite accumulation. Prior to the nitrification test, it was confirmed that the oxygen supply rate (OSR) was proportional to air pressure up to 100 kPa, allowing easy control of oxygen supply. Stable nitrite accumulation was observed in the partial nitrification test at a fixed oxygen supply throughout the operation period, indicating that oxygen was consumed only by ammonia oxidizers. Furthermore, it was demonstrated that oxygen utilization efficiency (OUE) in the ammonia oxidation process was nearly 100% after 300 h incubation.

Original languageEnglish
Pages (from-to)263-268
Number of pages6
JournalWater Science and Technology
Volume49
Issue number11-12
DOIs
Publication statusPublished - 2004

Keywords

  • Membrane-aerated biofilm reactor (MABR)
  • Oxygen supply rate (OSR)
  • Oxygen utilization efficiency (OUE)
  • Partial nitrification
  • Radiation-induced graft polymerization (RIGP)

ASJC Scopus subject areas

  • Environmental Engineering
  • Water Science and Technology

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