کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
3137 151 2014 5 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of dewatering process of activated sludge assisted by cationic surfactants
ترجمه فارسی عنوان
خصوصیات فرآیند آب شستشو لجن فعال همراه با سورفکتانت های کاتیونی
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
چکیده انگلیسی


• Surfactants can induce more EPS and bound water release from activated sludge.
• CTAB was more effective than DTAB in promoting sludge dewatering.
• A possible dewatering mechanism of cationic surfactants was proposed.

In this work, the dewatering of activated sludge assisted by cationic surfactants was investigated. Dose of dodecyl trimethyl ammonium bromide (DTAB) and cetyl trimethyl ammonium bromide (CTAB) resulted in the release of extracellular polymeric substances (EPS) from sludge and decrease in sludge negative charge. The surfactants significantly promoted sludge dewaterability, as reflected by decreased specific resistance of filtration (SRF) and water content in sludge cakes. The treated sludge were analyzed by combined use of differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA) and Brunauer–Emmett–Teller (BET) analysis. CTAB was found more effective in releasing bound water from sludge than DTAB, due to its superior surface activity and strong adsorption/bridge capacities with sludge. The specific surface area and pore size of sludge cakes declined after surfactant treatment, indicating an enhanced compressibility. With these results, the surfactant-assisted dewatering mechanism could be attributed to the integrated effects of electrostatic neutralization, enhanced compaction and release of EPS and bound water. Our study clearly characterizes the accelerated dewatering process assisted by cationic surfactants, and demonstrates that cationic surfactants could be used as a potential agent for sludge dewatering.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Biochemical Engineering Journal - Volume 91, 15 October 2014, Pages 174–178
نویسندگان
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