Abstract
The anaerobic treatment of antibiotic-contaminated organic wastes is often challenged by the reduction of the overall anaerobic digestion (AD) process performance. This study aimed to investigate the roles of ferric ion (Fe3+) and magnetite (Fe3O4) on process performance and volatile fatty acids (VFA) utilization pattern in an oxytetracycline (OTC)-pressured AD. Three sets of batch experiment were conducted where OTC, FeCl3 and Fe3O4 concentrations were varied from 0.07 to 0.19 g/gCOD, 0.04 to 0.15 g/gCOD and 0.07 to 0.14 g/gCOD, respectively. The results showed that the conversion of propionic and butyric acids into intermediate products was delayed by OTC. Moreover, OTC reduced methane yields (MY) between 25 and 27%. However, when FeCl3 and Fe3O4 were added, MY was increased by 7% and 33% at FeCl3 of 0.07 g/gCOD and Fe3O4 of 0.07 g/gCOD, respectively, along with the improvement of propionic and butyric acids conversion.
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