A study on Air Filled Porosity evolution in sludge composting

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Air Filled Porosity (AFP) is a key parameter in the composting process, conditioning oxygen availability and heat accumulation. Air pycnometry is considered the most adequate methodology for AFP determination. This technique requires withdrawing a sample of material from the composting mass for AFP measurement, which may alter its physical characteristics. A novel strategy that permits to measure AFP in situ during the composting process is presented in this study. Raw and Anaerobically Digested Sludges (ADS) have been used as substrates. A common trend in AFP evolution during the composting process has been observed in most of the cases. Copyright © 2012 Inderscience Enterprises Ltd.
Original languageEnglish
Pages (from-to)56-68
JournalInternational Journal of Environment and Waste Management
Issue number1-2
Publication statusPublished - 24 Feb 2012


  • ADS
  • Air filled porosity
  • Air pycnometry
  • Anaerobically digested sludge
  • APF
  • Composting
  • Cumulative oxygen consumption
  • FAS
  • Free air space
  • OUR
  • Oxygen uptake rate
  • Porosity
  • Raw sludge
  • RS


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