Dispersion analysis of an acidogenic UASB reactor

Ting Ting Ren, Yang Mu, Han Qing Yu, Hideki Harada, Gyokuyu Ri

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

The dispersion behavior of an upflow anaerobic sludge blanket (UASB) reactor for acidogenesis was investigated, and its flow patterns were simulated. Compared with the single-zone axial-dispersion model (with squared difference from 130 to 450), a two-zone axial-dispersion model (with squared difference from 1 to 7) was found to be more appropriate for simulating the dispersion characteristics of the acidogenic UASB reactor. A sensitivity analysis of the key model parameters was performed, and the axial dispersion coefficient was identified as the most important factor in the dispersion modeling of the reactor, implying that the acidogenic UASB reactor was potentially dispersion-controlled. The flow patterns, including mixed and plugging degrees, at different hydraulic loading rates were evaluated. The ratio of plug volume to mixed volume (Ip/Im) decreased with the increasing specific gas velocity (Ugsp) when the Ugsp value was low, but increased markedly with the increasing Ugsp after the Ugsp exceeded 0.7.

Original languageEnglish
Pages (from-to)182-189
Number of pages8
JournalChemical Engineering Journal
Volume142
Issue number2
DOIs
Publication statusPublished - 2008 Aug 15

Keywords

  • Acidogenesis
  • Dispersion
  • Hydrodynamics
  • Model
  • Upflow anaerobic sludge blanket (UASB)

ASJC Scopus subject areas

  • Chemistry(all)
  • Environmental Chemistry
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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