Effects of Long-term Tetracycline Exposure on the Performance of Denitrification Systems and Microbial Communities
In this experiment,a sequencing batch reactor(SBR)was constructed to investigate the effects of wastewater with tetracycline concentrations of 0～35 mg/L on the performance of the nitrification and denitrification system and the structure of the microbial community.The experimental results showed that the activity of nitrifying bacteria at tetracycline concentrations≤ 20 mg/L gradually recovered with the increase of the exposure cycle.At a tetracycline concentration of 35 mg/L,the nitrifying bacteria lost their activity and the nitrification system collapsed.Analysis of the microbial community structure showed that the presence of tetracycline caused the Proteobacteria phylum to develop some resistance.With increasing tetracycline concentration,the degree of inhibition of Ferribacterium and Nitrospira spp.became stronger and the inhibition of Zoogloea and Pseudoxanthomonas spp.became weaker.In addition,a tetracycline concentration of 5 mg/L favoured the growth of Thauera spp.Nitrosomonas spp.were inactivated at a tetracycline concentration of 35 mg/L.
achromycinnitrification systemactivated sludgebiological removal of nitrogenlong-term exposure
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