Sedimentation Technology0 pages
AST i M
nnnn■SEDIMENTATION
nnnnITECHNOLOGY
nnnnThe main principle of treatment by sedimentation is to remove readily settleable solids and floating material and
nnnnthus reduce the suspended solids content. The scraper mechanism which is installed inside the tank collects the
nnnnsettled solids. Almost all treatment plants use mechanically cleaned sedimentation tanks of standardized circular
nnnnor rectangular design. The selection of the type of sedimentation unit for a given application is governed by the
nnnnsize of the installation, by the characteristics of solid suspension of process liquid and by the experiences etc.
nnnnClarification is the process of separating solids from the liquid. The principle is to create floes from the suspended
nnnnmaterial in the liquid and let these floes settle by gravity in a calculated retention time. The selection of a tank
nnnnconfiguration and collector mechanism as scraper type and/or suction type depends upon the characteristics of
nnnnsolids suspension of process liquid.
nnnnAst i m designs and manufactures complete range sedimentation tank scrapers. Mainly these equipment are;
nnnn• Peripheral Driven Scrapers for circular tanks
nnnn• Travelling Scrapers for longitudinal tanks
nnnn• Central Driven Scrapers for circular tanks
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