Separation technologies for sludge dewatering

Particles in sludge feeds interact strongly one with another to prevent settling and offer a significant resistance to filtration and compression. This leads to the need for dewatering forces to be compressive ones applied directly to the networked solid phase; sometimes shear forces can be an assis...

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Bibliographic Details
Published in:Journal of hazardous materials 2007-06, Vol.144 (3), p.614-619
Main Author: Wakeman, Richard J.
Format: Article
Language:English
Subjects:
Applied sciences
Cake compression
Centrifugation, cyclones
Centrifuges
Chemical engineering
Compressibility
Decanters
Desiccation
Dewatering
Exact sciences and technology
Filter cloths
Filtration
General purification processes
Liquid-liquid and fluid-solid mechanical separations
Pollution
Pressure filters
Settling
Sewage
Sludge
Waste Disposal, Fluid - methods
Wastewater
Wastewaters
Water treatment and pollution
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Summary:Particles in sludge feeds interact strongly one with another to prevent settling and offer a significant resistance to filtration and compression. This leads to the need for dewatering forces to be compressive ones applied directly to the networked solid phase; sometimes shear forces can be an assist dewatering. Designs of filtration equipment most suitable for sludge dewatering have evolved to meet the intrinsic characteristics of sludges, the most important of which are their compressibility and fine particle sizes, which lead to cakes with extraordinarily high solids contents close to the filter medium. Hence, the membrane plate press, the belt filter and the decanter centrifuge have become most widely accepted machines for sludge dewatering. Filter presses tend to yield a drier solids discharge, but the level of dryness depends on the sludge properties. The same feed properties dictate the need for chemical pre-treatment to ensure the highest rates of dewatering and best clarity of filtrate, and correct choice of filter cloth is also crucial in these respects.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2007.01.084