Process and installation for sand removal and physiochemical clarification of municipal and industrial wastes

In treatment of waste waters, during periods of normal flow the waste water (11) is fed into a de-sanding vessel (2) where sand is allowed to settle out and is collected (22) and separated from the water stream (3), which is given further treatment. During periods of heavy flow the waste water strea...

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Bibliographic Details
Main Authors URSEL, VALERY, BINOT, PATRICK, BADARD, MICHEL
Format Patent
LanguageEnglish
French
German
Published 24.11.2004
Edition7
Subjects
ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTIONOF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, ORTHE LIKE
CESSPOOLS
CHEMISTRY
CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
FIXED CONSTRUCTIONS
METALLURGY
PERFORMING OPERATIONS
PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
SEPARATION
SEWERAGE
SEWERS
TRANSPORTING
TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
WATER SUPPLY
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Summary:In treatment of waste waters, during periods of normal flow the waste water (11) is fed into a de-sanding vessel (2) where sand is allowed to settle out and is collected (22) and separated from the water stream (3), which is given further treatment. During periods of heavy flow the waste water stream is mixed with a coagulant agent (80) in a turbulent zone. It is then dosed with a coagulant agent (80) in a turbulent zone. It is then dosed with a flocculant (90) and ballast sand (64) and mixed (15) with sufficient turbulence to keep the sand in suspension while the colloidal particles aggregate around it. The mixture is then allowed to settle and separate in the decanting vessel (2). The recovered muds are separated (54 and 63) and a proportion of the ballast sand recycled.
Bibliography:Application Number: EP19960401912