Accession Number : ADD006683

Title :   Flotation Device with Pretreatment.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Kuepper,Theodore A

Report Date : 29 May 1979

Pagination or Media Count : 7

Abstract : This invention relates to methods and apparatus for treating water/wastewater to remove grit, suspended and colloidal solids of organic and inorganic nature, microorganisms and surfactants. Dense suspended solids (grit) are first removed by a centrifugation process. The influent water/wastewater is then passed through coagulation and flocculation chambers, an upflow clarifier and a high-rate settling chamber for final sedimentation. Next, the influent passes through a foam filter to remove colloidal particles. The water/wastewater under treatment is then pressurized and saturated with air and subsequently depressurized, causing the dissolved gas to bubble out of soluton floating out suspended contaminants. At this point, ozone is introduced into the influent to create a thicker, more dense foam by oxidizing organic matter and for disinfection purposes. The foam floated to the surface of the influent is scraped off and furnishes the foam for the foam filter. (Author)

Descriptors :   *Patents, *Water treatment, *Flotation(Separation), Waste water, Centrifuge separation, Coagulation, Chemical precipitation, Ozone, Colloids, Disinfection, Foam, Surface active substances, Bubbles, Sedimentation, Gases, Oxidation, Disinfection

Subject Categories : Water Pollution and Control

Distribution Statement : APPROVED FOR PUBLIC RELEASE