کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
7703374 1496862 2018 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Cavitation field analysis for an increased efficiency of ultrasonic sludge pre-treatment using a novel hydrophone system
ترجمه فارسی عنوان
تجزیه و تحلیل زمینه کاویتاسیون برای افزایش بهره وری از قبل از درمان لجن اولتراسونیک با استفاده از یک سیستم هیدروژنی جدید
کلمات کلیدی
پیش از درمان لجن اولتراسونیک، حفره تحت فشار، راکتور تختخواب، تست هیدروفون، شدت کاویتاسیون،
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی (عمومی)
چکیده انگلیسی
The generation of cavitation fields for the pre-treatment of anaerobic sludge was studied by means of a novel acoustic measuring system. The influence of different reactor dimensions (i.e., choosing reaction chamber widths of 40, 60 and 80 mm) on the cavitation intensity was determined at various solid contents, flow rates and static pressures. Results suggest that the cavitation intensity is significantly reduced by the sonication of liquids with a high solid content. By increasing the pressure to 1 bar, the intensity of bubble implosions can be enhanced and the sound attenuation in the solid fraction is partly compensated compared to ambient pressure. However, a further increase in pressure to 2 bars has a detrimental effect due to the suppression of powerful bubbles. A reduction of the reactor gap permits an intensification of the treatment of waste activated sludge (WAS) by concentrating the ultrasound power from 6 to 18 dB. This effect is less relevant in digested sludge (DS) with its markedly lower total solids content (2.2% vs. 6.9% of solids in WAS). Increasing the flow rate, resulting in a flow velocity of up to 7 m/min, has no influence on the cavitation intensity. By adapting the reactor design and the static pressure to the substrate characteristics, the intensity of the sonication can be notably improved. This allows the design of sonication devices that are suitable for the intensive treatment of wastewater sludge.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ultrasonics Sonochemistry - Volume 42, April 2018, Pages 672-678
نویسندگان
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