کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4486280 1316982 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of biofilms on the movement of colloids in porous media. Implications for colloid facilitated transport in subsurface environments
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
Influence of biofilms on the movement of colloids in porous media. Implications for colloid facilitated transport in subsurface environments
چکیده انگلیسی

Colloid transport through porous media can be influenced by the presence of biofilms. Sterile and non-sterile sand columns were investigated using Laponite RD as model colloid and a highly mucoid strain of Pseudomonas aeruginosa as model biofilm former. Laponite RD was marked specifically by fluorescent complexes with rhodamine 6G. Breakthrough curves (BTCs) were used as parameters for determination of colloid transport characteristics. In the sterile columns, the colloid was mobile (collision efficiencies from 0.05 to 0.08) both after the presence of Na+ and Ca2+ ions followed by deionised water influent. In the biofilm-grown column, the same treatment did not result in colloid retention in the case of Na+ exposure, but in altered or enhanced colloid transport. In the case of Ca2+ ions exposure, colloid retention increased with biofilm age. After 3 weeks, almost complete retention was observed. Similar observations were made in columns packed with material from slow sand filtration units. These data reveal the complex interactions between biofilms, cations and colloid transport. Changes in the electrolyte composition of water percolating the subsurface can frequently occur and will result in different colloid transport characteristics with regard to the dominating species of ions and the relative abundance of microbial biofilms. This has to be considered when modelling colloid transport through the subsurface.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 41, Issue 10, May 2007, Pages 2059–2068
نویسندگان
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