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Combined impact of TiO2 nanoparticles and antibiotics on the activity and bacterial community of partial nitrification system
Author(s) -
Xu Han,
Binghua Liu,
Wen-Yu Qi,
Meng Xu,
Xiaoyu Cui,
Liu Jun,
Qiang Li
Publication year - 2021
Publication title -
plos one
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.99
H-Index - 332
ISSN - 1932-6203
DOI - 10.1371/journal.pone.0259671
Subject(s) - antibiotics , nitrification , proteobacteria , microbiology and biotechnology , bacteria , nitrite , chemistry , tetracycline , nitrifying bacteria , oxytetracycline , sewage treatment , environmental chemistry , biology , environmental engineering , nitrate , environmental science , genetics , 16s ribosomal rna , organic chemistry , nitrogen
The effects of TiO 2 nanoparticles (nano-TiO 2 ) together with antibiotics leaking into wastewater treatment plants (WWTPs), especially the partial nitrification (PN) process remain unclear. To evaluate the combined impact and mechanisms of nano-TiO 2 and antibiotics on PN systems, batch experiments were carried out with six bench-scale sequencing batch reactors. Nano-TiO 2 at a low level had minimal effects on the PN system. In combination with tetracycline and erythromycin, the acute impact of antibiotics was enhanced. Both steps of nitrification were retarded due to the decrease of bacterial activity and abundance, while nitrite-oxidizing bacteria were more sensitive to the inhibition than ammonia-oxidizing bacteria. Proteobacteria at the phylum level and Nitrosospira at the genus level remained predominant under single and combined impacts. The flow cytometry analysis showed that nano-TiO 2 enhanced the toxicity of antibiotics through increasing cell permeability. Our results can help clarify the risks of nano-TiO 2 combined with antibiotics to PN systems and explaining the behavior of nanoparticles in WWTPs.

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