Performance evaluation of a completely stirred anaerobic reactor treating pig manure at a low range of mesophilic conditions |
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Authors: | Jianbin Guo Renjie Dong Joachim Clemens Wei Wang |
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Institution: | 1. Department of Environmental Engineering, Tsinghua University, Beijing 100084, PR China;2. College of Engineering, China Agricultural University, P.O. Box 184, Beijing 100083, PR China;3. Institute of Crop Science and Resource Reservation (INRES), University of Bonn, Karlrobert-Kreiten-Strasse 13, 53115 Bonn, Germany |
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Abstract: | Many Chinese biogas plants run in the lower range of mesophilic conditions. This study evaluated the performance of a completely stirred anaerobic reactor treating pig manure at different temperatures (20, 28 and 38 °C). The start-up phase of the reactor at 20 °C was very long and extremely poor performance was observed with increasing organic loading rate (OLR). At an OLR of 4.3 g ODM L?1 d?1, methane production at 28 °C was comparable (3% less) with that at 38 °C, but the risk of acidification was high at 28 °C. At low OLR (1.3 g ODM L?1 d?1), the biogas process appeared stable at 28 °C and gave same methane yields as compared to the reactor operating at 38 °C. The estimated sludge yield at 28 °C was 0.065 g VSS g?1 CODremoved, which was higher than that at 38 °C (0.016 g VSS g?1 CODremoved). |
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Keywords: | Anaerobic digestion Organic loading rate Temperature Pig manure Sludge yield |
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