کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4411434 1618879 2010 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Competitive sorption and desorption behavior for three fluoroquinolone antibiotics in a wastewater treatment wetland soil
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Competitive sorption and desorption behavior for three fluoroquinolone antibiotics in a wastewater treatment wetland soil
چکیده انگلیسی

Significant amounts of pharmaceuticals are discharged into the environment through wastewater effluent. Sorption has been shown to be a significant aqueous removal pathway for many of these compounds. Competition between ciprofloxacin (CIP), ofloxacin (OFL) and norfloxacin (NOR) and their sorption to, and desorption from, a surrogate Louisiana wastewater treatment wetland soil were investigated to gain insight into the fate and transport of the pollutants within wastewater treatment wetlands. This study was undertaken in the context of a treatment wetland that continuously receives pharmaceuticals. Therefore it is important to understand the total capacity of this soil to sorb these compounds. Sorption to this treatment wetland soil was found to provide a major and potentially long-term removal pathway for these antibiotics from wastewater. Log KF values for all three compounds were between 4.09 and 3.90 for sorption and 4.24 and 4.05 μg1−1/n (cm3)1/n g−1 for desorption. The compounds were sorbed in amounts ranging from 60% to 90% for high and low loading, respectively. The majority of the compounds were sorbed to the soil within the first 20 h, indicating that treatment wetland may not need long retention times (weeks to months) in order to remove these compounds. Sorption KD values for competition (20 ppm of each compound for 60 ppm of total fluoroquinolones) ranged from 2300 to 3800 cm3 g−1 which is between both the 20 (4300–5800 cm3 g−1) and 60 (1300–3000 cm3 g−1) ppm single compound KD values, indicating that there is competition between these three compound for sorption sites. Sorption and desorption data (single component and mixture) collectively provide the following evidence: (1) NOR and, to a lesser extent, CIP outcompete OFL for sorption sites, (2) OFL sorbes to its share of “quality” sorption sites, and (3) competition only occurs for lesser “quality” binding sites.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 80, Issue 11, September 2010, Pages 1353–1359
نویسندگان
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