کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
147642 456397 2014 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Determination of sorption properties of micropollutants: What is the most suitable activated sludge inhibition technique to preserve the biomass structure?
ترجمه فارسی عنوان
تعیین ویژگی های جذب مخلوط های میکروپلاستی: برای حفظ ساختار بیوماس مناسب ترین تکنیک مهار لجن فعال است.
کلمات کلیدی
مهار فعال شدن لجن، جذب، ساختار لجن فعال دفع زباله، آزیت، تنفس
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی مهندسی شیمی (عمومی)
چکیده انگلیسی


• Five activated sludge inhibition techniques were tested.
• The lowest effective concentrations of chemical inhibitor were determined.
• Chemical and thermal techniques cause alteration to the activated sludge structure.
• The gas purging technique preserves the activated sludge structure.
• There is no perfect inhibition technique for anaerobic activated sludge.

Apart from providing a total activated sludge (AS) inhibition, an efficient AS inhibition technique must preserve the biomass structure in order to maintain the real sorption phenomenon. Many inhibition techniques with different modes of action were used in previous studies for AS inhibition. But, the effectiveness of AS deactivation and the adverse effects on the biomass structure were rarely related. In this paper, five common AS inhibition techniques were evaluated: thermal, three chemical and gas purging techniques. The lowest chemical effective concentrations were determined in order to limit the negative impact on the AS structure. 100 mgHg2SO4 gTSS−1 and 30 mgHgCl2 gTSS−1 within 2 h of reaction were enough to provide a complete AS inhibition. However, after 20 h of reaction a full AS inhibition has never been achieved with sodium azide at 200 mgNaN3 gTSS−1, even by increasing NaN3 concentration.The analysis of the AS apparent viscosity, the median size D50 of the flocs and the supernatant turbidity showed that the thermal technique destructured the AS completely. A significant AS deflocculation is induced by the three chemical reagents depending on the mode of action and the concentration used. Thermal and chemical inactivations are therefore not suitable to determine sorption properties. The only technique which kept the initial AS structure unchanged has several drawbacks since (i) a reaction might occur between the gas and the analyte of interest, and (ii) anaerobic activated sludge are not inhibited by this technique. Therefore, the establishment of anaerobic conditions without gas injection is recommended for implementing sorption experiments on aerobic AS.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Chemical Engineering Journal - Volume 242, 15 April 2014, Pages 260–268
نویسندگان
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