Three-dimensional immobilization of bacterial cells with a fibrous network and its application in a high-rate fixed-bed nitrifying bioreactor

Hiroshi Hayashi, Motomi Ono, Satoshi Tsuneda, Akira Hirata

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

A novel technique of immobilizing nitrifying bacteria using fibrous material, the three-dimensional immobilization with a fibrous network (3-D IFN), is proposed and its use in a high-rate nitrifying bioreactor is investigated. The fibrous carrier employed is ferro-nickel fibrous slag (FS), which is industrial solid waste from a ferro-nickel electrosmelting process. Since cell immobilization with FS is readily carried out within 90 seconds, this method is by far more rapid than any other cell immobilization techniques. A fixed-bed nitrifying reactor packed with cell-immobilizing FS is examined by both batch-mode and continuous feeding tests. By controlling the circulation flow rate, the transport of dissolved oxygen to the immobilized cells is improved, which is a distinct characteristic of this reactor. The continuous feeding test revealed that the ammonia removal rate of the reactor reached 6.5 kg-N/(m3-reactor)/d, which was extremely high compared with that of the conventional fixed-bed reactor for wastewater treatment. It is demonstrated that the 3-D IFN is a simple yet effective cell immobilization technique that can be successfully used in a high-rate nitrifying reactor.

Original languageEnglish
Pages (from-to)68-75
Number of pages8
JournalJOURNAL OF CHEMICAL ENGINEERING OF JAPAN
Volume35
Issue number1
DOIs
Publication statusPublished - 2002 Jan 1

Keywords

  • Bacterial cell immobilization
  • Biological wastewater treatment
  • Fibrous slag
  • Nitrification
  • Nitrifying bacteria

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)

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