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A study on Air Filled Porosity evolution in sludge composting
Courtesy of Inderscience Publishers
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.
Keywords: air filled porosity, air pycnometry, anaerobically digested sludge, sludge composting, cumulative oxygen consumption, free air space, oxygen uptake rate, porosity, raw sludge, anaerobic digestion
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