In this study,we detected and quantified five ARGs inWWTP units of
six pig farms in Taiwan. All of the tested ARGs were detected in the influx
samples at considerably high level. In most farms, the loaded quantities
of these ARGs ranged between 104 and 106 copies/ml, suggesting
animal husbandry an important source of antibiotic-resistant pathogens
in the receiving waters. The levels of ARGs were higher in the anaerobic
unit and lower in aerobic tank and the effluent. Anaerobic treatment is
necessary for biodegradation, but the procedure may induce growth of
the antibiotic resistant bacteria. Adjustment in treatment procedures
might help further improve the ARG removal. Additionally, increasing
the oxygen content and treatment under sunlight before discharge
may help reduce the dissemination of antibiotic resistant bacteria.