|کد مقاله||کد نشریه||سال انتشار||مقاله انگلیسی||ترجمه فارسی||نسخه تمام متن|
|5746599||1618803||2017||8 صفحه PDF||سفارش دهید||دانلود رایگان|
- Among 23 antibiotics investigated, 15 occur in the mix hospitalÂ +Â domestic effluent.
- In rural watershed upstream of WWTP discharge, only fluoroquinolones occur.
- The discharge strongly impacts the river quality especially for the low flow period.
- Only fluoroquinolones are present in particulate phase in substantial quantity.
- Antibiotic distribution in the particulate phase controls their dissipation in river.
The transfer of 23 antibiotics from domestic and hospital sources was investigated in two elementary river watersheds receiving wastewater treatment plant (WWTP) discharges, in relation with the hydrological cycle and seasonal conditions. Antibiotic concentrations in the effluent of a WWTP treating wastewaters from both hospital and domestic sources (18â12Â 850Â ngÂ Lâ1) were far higher than those from domestic sources exclusively (3-550Â ngÂ Lâ1). In rivers, upstream of the WWTP discharges, fluoroquinolones only were found at low concentrations (â¤10Â ngÂ Lâ1). Their presence might be explained by transfer from contaminated agricultural fields located on the river banks. Immediately downstream of the WWTP discharge, antibiotic occurrence increased strongly with mean concentrations up to 1210Â ngÂ Lâ1 for ofloxacin and 100% detection frequencies for vancomycin, sulfamethoxazole, trimethoprim and three fluoroquinolones. Dilution processes during high-flow periods led to concentrations 14 times lower than during low-flow periods. Downstream of the discharge, the antibiotic dissipation rate from the water column was higher for fluoroquinolones, in relation with their high sorption upon suspended matter and sediment. Only five antibiotics (vancomycin and four fluoroquinolones ciprofloxacin, norfloxacin, ofloxacin and enoxacin) were partly distributed (11%-36%) in the particulate phase. Downstream of the discharge, antibiotic contents in sediment ranged from 1700 to 3500Â ngÂ gâ1 dry weight, fluoroquinolones accounting for 97% of the total.
Journal: Chemosphere - Volume 168, February 2017, Pages 483-490