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Chinese Journal of Applied Ecology ›› 2021, Vol. 32 ›› Issue (11): 4129-4138.doi: 10.13287/j.1001-9332.202111.039

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Removal of sulfonamide and enrofloxacin from water by periphyton under different nitrogen and phosphorus concentrations

GU Xue-wei1, LIN Yi1, LU Di1, ZHONG Jing-yan1, XU Jing1, ZHAO Yue-tong1, WANG Li-qing1,2, ZHANG Wei1,2*   

  1. 1Center for Research on Envirmental Ecology and Fish Nutrient (CREEFN) of Ministry of Agriculture and Rural Affairs, Shanghai Ocean University, Shanghai 201306, China;
    2Ministry of Education Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources, Shanghai Ocean University, Shanghai 201306, China
  • Online:2021-11-15 Published:2022-05-15
  • Supported by:
    This work was supported by the National Water Pollution Control Major Project during the 13th Five-Year Plan Period (2017ZX07207002) and the Project of Shanghai Science and Technology Commission (19DZ1204504).

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Abstract: Periphyton is an emerging biological technology for water purification. However, the removal effect of periphyton on antibiotic contaminants in water under different nitrogen and phosphorus levels remains largely unknown. In this study, four nitrogen and phosphorus levels [N-P (mg·L-1): 2-0.2, 5-0.5, 8-0.8, 11-1.1] were set up to grow periphyton outdoors in plastic crates. The growth, photosynthe-tic activity, species composition, and removal of sulfonamide and enrofloxacin were simulated at a medium scale. The results showed that biomass of the surrounding organisms increased with the increases of culture time. In contrast, the photosynthetic pigment content and photosynthetic activity showed a “single peak” pattern, which first decreased and then increased, indicating that algae in the biofilm would be stressed by antibioics but could quickly adapt and recover vitality. In addition, different nitrogen and phosphorus concentrations resulted in differences in community composition. With the increases of nutrient concentrations, species richness of periphyton algae gradually decreased. The relative abundance of Dictyosphaerium and Chlorella in each treatment was relatively high. Results of 16S rRNA high-throughput sequencing showed that the flora of Rhizobiaceae, Frankiales, and Moraxellaceae was significantly enriched in groups 2-0.2. The relative abundance of Chitinophagaceae in all the four treatments was the highest. The removal rate of sulfonamide in all treatments was higher than 50%, while the removal rate of enrofloxacin in all treatments was more than 90%. The removal rate of sulfonamide in (N-P) 2-0.2 mg·L-1 group (65.8%) was significantly higher than that in other groups, but with no significant difference in the removal rate of enrofloxacin among all treatments. The results showed that periphyton had an excellent ability to remove sulfonamide and enrofloxacin in a wide range of N-P levels. The removal rate of soluble nitrogen in water was not different in each treatment group, and the removal effect of soluble phosphorus was substantial. Our results provided primary data for the ecological removal of sulfonamide and enrofloxacin in water, which gave a new idea for the development of environmental removal technology for new antibiotic pollutants in water.

Key words: nitrogen and phosphorus concentration, periphyton, sulfonamide, enrofloxacin, removal effect.