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Method for removing contaminants from water with the addition of oil droplets
| Details |
Inventors: Benn, James A.; Thode, Kenneth C.;
Assignee:
Primary Examiner: Hruskoci; Peter A.
Assistant Examiner:
Attorney, Agent or Firm: Mintz, Levin, Cohn, Ferris, Glovsky and Popeo, P.C.
A method for removing a contaminant from water includes mixing droplets of a substantially non-water soluble oil with water to combine with the contaminant. The oil can include polar or ionic functional groups. A chemical destabilizer is added to the water to coagulate and aggregate the oil-contaminant mixture. The mixture is then separated from the water by gravity settling, filtration, or dissolved air flotation, thereby removing the contaminant. |
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DETAILED DESCRIPTION OF THE INVENTION While this invention has been particularly shown and described with references to preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
All percentages and parts are by weight unless otherwise indicated.
An objective of water treatment is to remove contaminants from water so that it is biologically and chemically safe for its intended use.
Water intended for drinking must, of course, be purified to a much greater extent than wastewater that is to be discharged to the environment.
However, even this water must be purified to the extent that the remaining contaminants are not toxic to the environment.
When chemical destabilization is used to purify water, contaminants that are either dissolved in the water or that do not carry polar functional groups or that have hydrophilic surfaces are not appreciably removed.
It is the purpose of this invention to extend the capability of chemical destabilization to remove these contaminants.
These capabilities are realized by adding oil to the water that is easily removed by destabilization.
The oil is selected to combine with or capture the contaminants and therefore impart to the contaminants those physical quantities that allows them to be removed by use of chemical destabilization.
Therefore, dissolved contaminants, after combination with the oil, become water-insoluble, the surfaces of particles or droplets of contaminants in combination with the oil acquire attributes of polar functional groups, and also become sufficiently hydrophobic so that air bubbles readily attach to them, allowing their removal by DAF or other suitable means.
Mechanisms for the Oil to Combine with or Capture Contaminants Solvent Extraction Mechanism A feature of this invention is that an oil is added to the contaminated water that is substantially insoluble in the water
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