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DOI: https://doi.org/10.4491/eer.2020.258
Hydrothermal pretreatment of oxytetracycline fermentation residue: Removal of oxytetracycline and increasing the potential for anaerobic digestion
Mohammed Awad1, Zhe Tian1,2, Yu Zhang1,2, Min Yang1,2, Wenjuan Yin3, and Liping Dong3
1State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
2University of Chinese Academy of Sciences, Beijing 100049, China
3State environmental protection engineering center for harmless treatment and resource utilization of antibiotic residues, Xinjiang 835007, China
Corresponding Author: Zhe Tian ,Tel: +86-010-62843038, Fax: +86-10-62923541, Email: zhetian@rcees.ac.cn
Received: May 21, 2020;  Accepted: July 23, 2020.
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ABSTRACT
The presence of high level of antibiotics in the antibiotic fermentation residue is one of the main reasons that prevent their direct disposal or further use as a resource. In this study, the feasibility of using the hydrothermal pretreatment for removing oxytetracycline (OTC) from its fermentation residue and enhancing anaerobic digestion was evaluated under different temperatures i.e. 110, 130, 150 and 170°C. The results showed that the removal rate of OTC increased as a function of temperature, and hydrothermal treatment at 130°C for 5 min was found sufficient to reduce the concentration of OTC from 3.9 mg/g to less than the detection limit (i.e., 0.25 ng/g). Biochemical methane potential tests showed that the cumulative methane production over 23 d was 73.7, 215.9, 656.8, and 439.0NmL CH4/gVS for the raw residue and the residue treated at 130, 150, and 170°C for 5 min, respectively. At the same time, the abundances of tetracycline resistance genes were reduced by hydrothermal treatments followed by anaerobic digestion. Conclusively, it is suggested that hydrothermal treatment at 150°C for 5 min was found beneficial for OTC fermentation residues ensuring the removal of OTC and further use of the residue for anaerobic digestion.
Keywords: Antibiotic fermentation residue | Biochemical methane potential | Oxytetracycline | Thermal hydrolysis
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