کد مقاله کد نشریه سال انتشار مقاله انگلیسی ترجمه فارسی نسخه تمام متن
625064 1455416 2011 7 صفحه PDF سفارش دهید دانلود رایگان
عنوان انگلیسی مقاله ISI
Excess sludge reduction using ultrasonic waves in biological wastewater treatment
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موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
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Excess sludge reduction using ultrasonic waves in biological wastewater treatment
چکیده انگلیسی

The effect of sludge lysis using ultrasonic waves on the sludge yield coefficient was investigated using pilot-scale SBR reactors. Our results revealed that reduction of excess sludge is affected by multiple factors including the energy supplied to sludge mass, the power used for wave generation, duration of wave usage, and percentage of sludge exposed to the waves. Increasing the energy supplied to the sludge mass resulted in more reduction of sludge yield but energies greater than 35,000 kJ/kg VSS showed no significant effect on sludge reduction. Moreover, less power and more retention time showed better performance in sludge reduction. Using ultrasonic waves for reducing sludge yield deteriorated the quality of the reactor effluent and also increasing volume of the sludge lysed by waves at every run brought about decreasing COD removal efficiency. In order to meet standards for effluent discharge to surface and groundwater bodies, a maximum 30% of the system sludge could be lysed resulting in approximately 78% reduction of sludge yield. In this case, the sludge SOUR decreased down to 9 mg DO/g SS.h, but the sludge sedimentation property was improved and SVI was reduced.

Research Highlights
► Specific supplied energy has effect in excess sludge reduction.
► Sludge sonication deteriorates the quality of the effluent.
► Sludge sonication decreases SOUR but improves sludge sedimentation characteristic.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 275, Issues 1–3, 15 July 2011, Pages 67–73
نویسندگان
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