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摘要
This study evaluated the short-term acute inhibition impacts of nine antibiotics (ribostamycin, streptomycin, erythromycin, spiramycin, tetracycline, oxytetracycline, lincomycin, chloramphenicol, and cefazolin) at two concentration levels (25 mg?L-1 and 50 mg?L-1) on thermophilic anaerobic digestion (AD). Results showed that oxytetracycline and streptomycin at the concentration of 25 mg?L-1and 50 mg?L-1 didn't inhibited methane production, while tetracycline and ribostamycin at the concentration of 50 mg?L-1 reduced methane production by 36.13% and 17.50%, respectively, after thermophilic AD for seven days. Cefazolin, lincomycin, erythromycin, spiramycin, and chloramphenicol showed a strong acute inhibitory effect at the concentration of 25 mg?L-1. The cumulative methane production in lincomycin and chloramphenicol exposing systems decreased by 29.39% and 19.88%, respectively, at the concentration of 25 mg?L-1, and further decreased to 51.27% and 49.46%, respectively, at the concentration of 50 mg?L-1. Cefazolin, erythromycin and spiramycin showed similar acute inhibitory effects at concentrations of 25 mg?L-1 and 50 mg?L-1, with their cumulative methane productions decreasing by 43.03% to 47.49%, 40.60% to 44.91% and 54.61% to 55.69%, respectively. The change of volatile organic acids after thermophilic AD indicated that lincomycin could reduce methane production by inhibiting syntrophic butyric-acid-oxidizing bacteria, and ribothromycin mainly impacted the activity of aceticlastic methanogen. At the same time, erythromycin, spiramycin, chloramphenicol, cefazolin, and tetracycline at the tested concentrations might inhibit both the activity of methanogen and syntrophic bacteria.
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