Performance of aerobic granular sludge in a sequencing batch bioreactor exposed to ofloxacin, norfloxacin and ciprofloxacin

Water Research
Catarina L AmorimPaula M L Castro

Abstract

A granular sludge sequencing batch reactor (SBR) was operated for 340 days for treating a synthetic wastewater containing fluoroquinolones (FQs), namely ofloxacin, norfloxacin and ciprofloxacin. The SBR was intermittently fed with FQs, at concentrations of 9 and 32 μM. No evidence of FQ biodegradation was observed but the pharmaceutical compounds adsorbed to the aerobic granular sludge, being gradually released into the medium in successive cycles after stopping the FQ feeding. Overall COD removal was not affected during the shock loadings. Activity of ammonia oxidizing bacteria and nitrite oxidizing bacteria did not seem to be inhibited by the presence of FQs (maximum of 0.03 and 0.01 mM for ammonium and nitrite in the effluent, respectively). However, during the FQs feeding, nitrate accumulation up to 1.7 mM was observed at the effluent suggesting that denitrification was inhibited. The activity of phosphate accumulating organisms was affected, as indicated by the decrease of P removal capacity during the aerobic phase. Exposure to the FQs also promoted disintegration of the granules leading to an increase of the effluent solid content, nevertheless the solid content at the bioreactor effluent returned to normal levels within...Continue Reading

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Citations

Apr 23, 2015·Letters in Applied Microbiology·Y-Q LiuP Zeng
Jan 28, 2015·Journal of Hazardous Materials·Irina S MoreiraPaula M L Castro
Jan 27, 2015·Applied Microbiology and Biotechnology·M PronkM C M van Loosdrecht
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Aug 4, 2016·Environmental Toxicology and Pharmacology·Hamdi Mihciokur, Merve Oguz
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Apr 17, 2020·International Journal of Environmental Research and Public Health·Huiru LiChunping Yang
Jul 3, 2020·Environmental Science and Pollution Research International·Guiquan CheLaisheng Li
Mar 20, 2018·Applied Microbiology and Biotechnology·Juntao XiaXu-Xiang Zhang
Feb 15, 2021·Chemosphere·Clara de Amorim de CarvalhoAndré Bezerra Dos Santos
Apr 28, 2021·Environmental Technology·Vânia S BessaPaula M L Castro
May 5, 2021·The Science of the Total Environment·Bao-Trong DangTodd Saunders
Jul 24, 2021·Environmental Science and Pollution Research International·Ruyi XiaoJianhua Xiong
Jun 28, 2019·Environmental Science & Technology·Akashdeep Singh OberoiHui Lu
Aug 29, 2021·Journal of Applied Microbiology·Di CuiWenlan Li
Aug 31, 2017·New Biotechnology·Diogo A M AlexandrinoMaria F Carvalho

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