Progress in the Search for Low-Shear, High Solids Dewatering Alternatives
Abstract:Due to the need to transport biosolids long distance for final reuse and disposal, or to subject biosolids for further processing, mechanical dewatering of biosolids is becoming a standard process at many wastewater treatment plants. Dewatering of sewage solids is usually carried out using belt filter presses or centrifuges. Centrifuges can generally produce a drier cake, but at higher conditioning chemical dose. Recent studies have shown that the high shear in centrifuges not only requires higher chemical doses for dewatering, but also is a main cause of dewatered cake odor. Alternative dewatering devices that do not impose comparable shear on the sludge but provide comparable cake solids are explored. Performance of these devices is analyzed for suitable applications.
Document Type: Research Article
Publication date: January 1, 2008
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