Abstract
• UV/PS process completely inactivated tetracycline resistant bacteria. • UV/PS was effective to remove tetA, tetM and tetW in mariculture wastewater. • UV irradiation played an important role in removing tetracycline resistance genes. • Tetracycline dosage inhibited the removal of tetA, tetM and tetW in UV treatment. The antibiotic resistant bacteria and resistance genes are frequently detected recently in mariculture wastewater, thus posing a severe threat to the marine ecological environment. In this study, ultraviolet/peroxysulfate (UV/PS) process was adopted to treat tetracycline resistance pollutants and the influence of the seawater components, especially halogen ions, on UV/PS performance was investigated. The results showed that UV/PS process completely inactivated tetracycline resistant bacteria (TRBs) in five minutes and effectively removed tetracycline resistance genes (TRGs) for 1.18-2.17 log of tetA, tetM and tetW from mariculture wastewater. UV irradiation played an important role in the removal of three TRGs, where SO 4 · − contributed partly to the removal of tetA , while the partial removal of tetM and tetW was ascribed to the matrix composition, especially Cl − in mariculture wastewater. Due to UV competition effect, tetracycline as organic matter impacted heavily on the removal of the three TRGs in UV treatment, but even not in UV/PS system. This study demonstrated that UV/PS is a new alternative process to effectively remove tetracycline resistance pollutants in mariculture wastewater. Graphical Abstract .
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