کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4414636 1307720 2008 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Development of pseudo-amphoteric sponge media using polyalkylene oxide-modified polydimethylsiloxane (PDMS) for rapid start-up of wastewater treatment plant
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست شیمی زیست محیطی
پیش نمایش صفحه اول مقاله
Development of pseudo-amphoteric sponge media using polyalkylene oxide-modified polydimethylsiloxane (PDMS) for rapid start-up of wastewater treatment plant
چکیده انگلیسی
Hydrophobic sponge media require a relatively long start-up period, as they just float on the surface of aeration tanks due to their little tendency to adsorb water, which causes a delay in the initiation of bacterial attachment. In order to overcome this difficulty, a new pseudo-amphoteric BioCube media (a standard BioCube is hydrophobic) using polyalkylene oxide-modified polydimethylsiloxane (PDMS) as a surfactant was developed. Of the many evaluated hydrophilizing agents, polyalkylene oxide-modified PDMS was found suitable. Among the diverse types of modified PDMS, the non-reactive polyethylene oxide-modified PDMS was found to be optimum agent. Pseudo-amphoteric BioCube media are readily immersible, but after complete immersion, they gradually become hydrophobic, as the polyethylene oxide-modified PDMS is designed to alienate from polyurethane backbone of BioCube to provide hydrophobic surfaces exhibiting more affinity for bacterial attachment. Clearly, the pseudo-amphoteric BioCube showed faster bacterial attachment during the early stage due to chances of enhanced contact between the bacteria and media surfaces, but the extent of attachment between the hydrophobic and pseudo-amphoteric BioCube was similar at the steady state because the former (pseudo-amphoteric BioCube) had already changed to hydrophobic. Fluorescent in situ hybridization result showed 14% occupation by ammonia oxidizing bacteria, 13% by nitrite oxidizing bacteria and 73% by others in pseudo-amphoteric BioCube, respectively.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemosphere - Volume 71, Issue 5, March 2008, Pages 961-968
نویسندگان
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