volume of biogas produced was automatically measured
using a Challenge ANR-100 anaerobic respirometer (Challenge
Environmental Systems, Inc., Arkansas, USA). The
methane production rates were estimated by analysis of
the methane contents in the biogas using gas chromatography
(GC, Hewlett Packard 5890 series II) with a flame ionization
detector. In order to calculate the theoretical biogas
yield of swine manure, an elemental analysis was conducted
using an EA 1110 elemental analyser (CE Instruments,
Milano, Italy).
volume of biogas produced was automatically measuredusing a Challenge ANR-100 anaerobic respirometer (ChallengeEnvironmental Systems, Inc., Arkansas, USA). Themethane production rates were estimated by analysis ofthe methane contents in the biogas using gas chromatography(GC, Hewlett Packard 5890 series II) with a flame ionizationdetector. In order to calculate the theoretical biogasyield of swine manure, an elemental analysis was conductedusing an EA 1110 elemental analyser (CE Instruments,Milano, Italy).
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