Sci Total Environ 2021 Oct 21;789:147910. Epub 2021 May 21.
Catalan Institute for Water Research (ICRA), C. Emili Grahit 101, 17003 Girona, Spain; Universitat de Girona, Girona, Spain. Electronic address:
This study investigates the effect of psychrophilic, mesophilic and thermophilic temperatures on the anaerobic treatment of slaughterhouse wastewater, in terms of biogas production, occurrence of 30 pharmaceutical compounds of veterinary use, 4 antibiotic resistance genes (ARGs) which provide resistance to tetracyclines (tetW), fluoroquinolones (qnrS), macrolide-lincosamide-streptogramin (ermB) and sulfonamides (sul1) antibiotics, as well as class I integron-integrase gene (intI1), related to horizontal gene transfer. The highest methane yield was obtained at a mesophilic temperature (35 °C) (323 mL CH/g TCOD) followed by the yield obtained at thermophilic temperature (53 °C) (242 mL CH/g TCOD). Regarding pharmaceuticals, chlortetracycline, oxytetracycline, tilmicosin, and lincomycin were the most abundant in the slaughterhouse wastewater, being detected predominantly in the solid phase (with median concentrations >200 μg/kg dry weight). Read More