Process for combining solids thickening and dewatering in one vessel

• US 20090127180A1
• Filed: 01/14/2009
• Published: 05/21/2009
• Est. Priority Date: 07/08/2004
• Status: Active Grant

• Current Assignee: Franklin David Deskins
• Original Assignee: Franklin David Deskins
• Inventors: Deskins, Franklin David
• Granted Patent: US 7,691,261 B2
• Time in Patent Office: Days
• US Class Current: 210/253
• CPC Class Codes: B01D 21/0012 Settling tanks making use of filters, e.g. by floating layers of particulate material
• CPC Class Codes: B01D 21/02 Settling tanks with single outlets for the separated liquid
• CPC Class Codes: B01D 21/2444 Discharge mechanisms for the classified liquid
• CPC Class Codes: B01D 24/24 Downward filtration, the container having distribution or collection headers or pervious conduits
• CPC Class Codes: C02F 1/004 using large scale industrial sized filters
• CPC Class Codes: C02F 1/02 by heating methods of steam generation F22B; preheating boiler feed-water or accumulating preheated boiler feed-water F22D
• CPC Class Codes: C02F 1/48 with magnetic or electric fields C02F1/46 takes precedence
• CPC Class Codes: C02F 1/56 Macromolecular compounds
• CPC Class Codes: C02F 1/66 by neutralisation; pH adjustment for degassing C02F1/20; using ion-exchange C02F1/42; for flocculation or precipitation of suspended impurities C02F1/52; for removing dissolved compounds C02F1/58
• CPC Class Codes: C02F 11/121 by mechanical de-watering
• CPC Class Codes: C02F 11/147 using organic substances C02F11/148 takes precedence
• CPC Class Codes: C02F 2209/11 Turbidity

Abstract

A granular filter media dry cell (or filter or bed) for dewatering a liquid composition of water and particulate solids. The liquid composition is applied to the granular filter media to remove water from the liquid composition by passing through the granular filter media with the particular solids collecting on top surface of granular filter media. Water is first allowed to fill from below to just above the top layer of the filter media. A non-porous liner is located on the inner, bottom surface of the container. A drain pipe, having small openings, is located on top of the liner in the valley. A porous layer of large filter media, with the drain pipe therein, is located in the bottom of the container. A grid having open passageways, with fine filter media therein, is located on top thereof. A layer of fine filtrate sand is located on top of the grid.

Claims

1. :

A granular filter media dry cell, filter or bed for dewatering a composition composed of water and particulate solids, comprising a non-porous container having an exit for liquid and having side walls and a bottom, the bottom having two complementary portions that slant downward toward each other so as to form a valley or depression where the two complementary portions meet, a non-porous liner located on inner surface of the bottom, a drain pipe located on or near top of the liner in the valley, one end portion of the drain pipe extending through the exit, remainder of the drain pipe having of multitude of small openings around at least a major portion of circumference thereof, a porous layer of a large filter media is located in the bottom of container with the drain pipe being located in the layer of large filter media, a grid having open passageways is located on top of the layer of the large media, a fine filter media is located in the open passageways of the grid, and a porous layer of filter sand is located on top of the grid.

2. :

The granular filter media dry cell, filter or bed of claim 1, wherein the liner extends up at least a portion of the side walls of the container.

3. :

The granular filter media dry cell, filter or bed of claim 2, wherein a least one means for inserting water into the container is located on or above at least one side wall of the container.

4. :

The granular filter media dry cell, filter or bed of claim 3, wherein at least one means for water insertion is located on each of two opposing walls of the container.

5. :

The granular filter media dry cell, filter or bed of claim 2, wherein there is means for removing water located on top of the sand layer.

6. :

The granular filter media dry cell, filter or bed of claim 5, where the means for water removal is a device located on one side wall of the container, and the device is capable of being moved up or down the side wall.

7. :

The granular filter media dry cell, filter or bed of claim 2, wherein there is means for sensing the height of water in the non-porous container.

8. :

The granular filter media dry cell, filter or bed of claim 2, wherein the porous layer of the large filter media has a thickness of 2 to 12 inches, the grid has a thickness or height of 2 to 12 inches, and the porous layer of filter sand has a thickness of 2 to 12 inches.

9. :

The granular filter media dry cell, filter or bed of claim 8, wherein bottom of the drain pipe touches the liner or is within two inches of the liner.

10. :

The granular filter media dry cell, filter or bed of claim 2, wherein the composition comprised of water and particulate solids is treated water from a water treatment plant.

11. :

The granular filter media dry cell, filter or bed of claim 2, wherein there are two or three areas in the bottom of the non-porous container that each have a valley or depression formed by complementary sloping bottom portions, and one of said drain pipes is located in each of said depressions.

12. :

The granular filter media dry cell, filter or bed of claim 2, wherein the composition comprised of water and particulate solids is treated sewage.

13. :

A combination of granular filter media dry cells, filters or beds for dewatering a composition comprised of water and particulate solids, the combination comprising at least two of the non-porous containers of claim 1.

14. :

The combination of claim 13, wherein the at least two of the non-porous containers are aligned in line with each other, and adjacent non-porous containers have a common side wall.

15. :

The combination of claim 14, wherein the at least two of the non-porous containers comprise three of the non-porous containers.

16. :

The granular filter media dry cell, filter or bed of claim 13, wherein, for each of the containers, the liner extends up at least a portion of the side walls of the container.

17. :

The granular filter media dry cell, filter or bed of claim 13, wherein, for each of the containers, at least one means for inserting water into the container is located on or above at least one side wall of the container.

18. :

The granular filter media dry cell, filter or bed of claim 17, wherein, for each of the containers, at least one means for water insertion is located on each of two opposing walls of the container.

19. :

The granular filter media dry cell, filter or bed of claim 13, wherein, for each of the containers, there is means for removing water located on top of the sand layer.

20. :

The granular filter media dry cell, filter or bed of claim 19, where, for each of the containers, the means for water removal is a device located on one side wall of the container, and the device is means capable of being moved up or down the side wall.

21. :

The granular filter media dry cell, filter or bed of claim 13, wherein, for each of the containers, the valley or depression is slanted towards the exit of the non-porous container.

22. :

The granular filter media dry cell, filter or bed of claim 13, where the composition comprised of water and particulate solids is treated water from a water treatment plant.

23. :

The granular filter media dry cell, filter or bed of claim 13, wherein, for each of the containers, the composition comprised of water and particulate solids is treated sewage.

24-36. -36. (canceled)