The importance of aeration mode and flowrate in the determination of the biological activity and stability of organic wastes by respiration indices

Natividad Almeira, Dimitrios Komilis, Raquel Barrena, Teresa Gea, Antoni Sánchez

Research output: Contribution to journalArticleResearchpeer-review

17 Citations (Scopus)

Abstract

© 2015 Elsevier Ltd. The aim of this study was to assess the effect of different air flowrates and different aeration modes on the respiration activity of three organic substrates of different stability degree: (i) a constant flowrate and (ii) a continuously adjusted air flowrate that optimized the oxygen uptake rate (OUR). Above 20L air kg-1DMh-1, at the constant flow regime, the resulting dynamic respiration index at 24h (DRI24) and the cumulative respiration at four days (AT4) were statistically similar. At the OUR based aeration regime, the DRI24 and AT4 were statistically similar at all initial flowrates tested. Above a minimum threshold, cumulative air flow of around 3000Lairkg-1 DM during a 5day period, the respiration activity was similar, particularly for the two less active substrates. This study highlights the importance of selecting the aeration to obtain reliable measures of biological activity and stability in organic wastes.
Original languageEnglish
Pages (from-to)256-262
JournalBioresource Technology
Volume196
DOIs
Publication statusPublished - 1 Jan 2015

Keywords

  • Aeration mode
  • Biological stability
  • Dynamic respiration index
  • Oxygen uptake rate
  • Stability

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