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Short term effects of copper, sulfadiazine and difloxacin on the anaerobic digestion of pig manure at low organic loading rates |
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| Authors: | Guo Jianbin Ostermann Anne Siemens Jan Dong Renjie Clemens Joachim |
| Institution: | a College of Water Conservancy and Civil Engineering, China Agricultural University, P.O. Box 184, Beijing 100083, PR China b Institute of Crop Science and Resource Conservation, University of Bonn, Nussallee 13, 53115 Bonn, Germany c College of Engineering, China Agricultural University, P.O. Box 184, Beijing 100083, PR China d Institute of Crop Science and Resource Conservation, University of Bonn, Karlrobert-Kreiten-Straße 13, 53115 Bonn, Germany |
| Abstract: | Antibiotics of inorganic and organic origin in pig manure can inhibit the anaerobic process in biogas plants. The influence of three frequently used antibiotics, copper dosed as CuSO4, sulfadiazine (SDZ), and difloxacin (DIF), on the anaerobic digestion process of pig manure was studied in semi-continuous experiments. Biogas production recovered after every Cu dosage up to a sum of 12.94 g Cu kg−1 organic dry matter (ODM), probably due to Cu precipitation following the formation of sulphide from sulphate. Complete inhibition was found at the very high Cu concentration of 19.40 g Cu kg−1 ODM. Inhibitory effect of SDZ and DIF was observed at concentrations as high as 2.70 g kg−1 ODM and 0.54 g kg−1 ODM, respectively. It seems very unlikely that the antibiotics tested would inhibit the anaerobic process in a full-scale biogas plant. |
| Keywords: | Anaerobic digestion Copper Antibiotics Pig manure |
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