|Publication number||US3219189 A|
|Publication date||Nov 23, 1965|
|Filing date||Aug 28, 1962|
|Priority date||Aug 29, 1961|
|Publication number||US 3219189 A, US 3219189A, US-A-3219189, US3219189 A, US3219189A|
|Inventors||Richard P Moore|
|Original Assignee||Richard P Moore|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (5), Referenced by (19), Classifications (10)|
|External Links: USPTO, USPTO Assignment, Espacenet|
Nov. 23, 1965 R. P. MOORE APPARATUS FOR SCUM REMOVAL 2 Sheets-Sheet 1 Filed Aug. 28, 1962 9% Wm mm mm,
AIM-Wm flail/mo Mame:
Nov. 23, 1965 R. P. MOORE APPARATUS FOR SCUM REMOVAL 2 Sheets-Sheet 2 Filed Aug. 28, 1962 United States Patent 3,219,189 APPARATUS FOR SCUM REMOVAL Richard P. Moore, Argosy House, Spilsbury St., Germiston, Transvaal, Republic of South Africa Filed Aug. 28, 1962, Ser. No. 219,877
Claims priority, application Republic of South Africa,
Aug. 29, 1961, R 1,311/61 2 Claims. (Cl. 210-195) moving parts, but suffers from the disadvantage that it is difiicult to collect and retain the scum in a concentrated area and further to move it along the blade to the withdrawal point, and unless concentrated, liquid loss with scum withdrawal is excessive.
An object of the invention is to provide a simplified scum removal system, in which the shortcomings of the abovementioned systems are considerably minimized and the scum is positively collected in a concentrated area.
According to the present invention apparatus for removing scum from a tank includes a blade on the surface of the liquid in the tank, jets adapted to urge the scum to collect at the blade and to be forced through an opening in the tank to a second tank, draw-0E means for the scum in the second tank and a passage from the second tank, below the opening, to the first tank.
In this apparatus, liquid is returned from the second tank to the first, while the scum collecting in the second tank is withdrawn. The passage from the second tank to the first is located at sufficient depth to ensure that the scum cannot pass back again into the first tank.
Further according to the invention an induced flow is provided from the surface of the liquid in the first tank through the opening to the second tank. This flow may be provided by means of a jet located at or in the openmg.
Still further according to the invention jets are provided along the length of the blade. Thus, the front side of the blade is provided with jets spaced apart and adapted to motivate the scum in a substantially circular movement to the rear of the blade. Additional jets may be provided on the rear of the blade and directed parallel thereto to force the scum into the opening to the second tank. An additional jet or jets may be located in the opening further to urge the scum into the second tank.
According still further to the invention, the outer extremity of the blade is provided with a float.
Removal of the scum from the second tank may be eflfected by means of a small Weir or the like or may be removed manually by skimming .or the like or automatically by a suitably controlled gate or scoop.
It will be appreciated that the scum may be readily concentrated to a considerable degree in the second tank, and this prevents it from dispersing, so that its removal is effected very economically with a maximum solids to water ratio.
It will also be realized that the second tank may serve a number of main tanks; it may also be located inside a settling tank or the like.
An embodiment of the invention is described below with reference to the accompanying drawings, in which FIGURE 1 is a sectional side view of apparatus according to the invention, and is a vertical section along the line 1-1 of FIGURE 2,
FIGURE 2 is a plan view of the apparatus, and
FIGURE 3 is a fragmentary perspective view of a blade, showing also the opening from the first tank into the second tank.
In the figures a settling tank 10 has an inlet 12 for liquid to be settled and an outlet 14 for withdrawal of the sludge which settles to the bottom.
Adjacent the tank 10 is a second tank or pocket 16 which communicates with the tank 10 through an opening 18 and also through a passage 20 located at a lower level than opening 18. Reference 22 is an observation platform.
A blade 24 is fixed at the opening 18 and extends along the surface of the liquid in tank 10. A float 26 is provided at the outer extremity of the blade 24. Preferably the blade should be three-quarters submerged.
Jets 28 are provided along the front surface of the blade 24. The angles which these jets make with the blade are chosen to induce the scum around the surface of the liquid as indicated by arrows 30. The scum therefore moves around to the rear or collecting surface of the blade, which is provided with jets 32, parallel to the blade and which urge the collected scum along the blade through the opening 18. A jet 34 is located in the opening to assist the flow of scum into the second tank 16.
Jets 28, 32 and 34 may all be served by pipe 36 which communicates with a suitable source of liquid.
A scum board 38 and channel 40 are also provided.
The scum together with a quantity of liquid passes through the opening 18 into tank 16, which has an outlet 42 for withdrawing the concentrated scum. Liquid reenters tank 10 through passage 20.
1. In a tank having side walls and an opening in a said side wall for the discharge of scum floating on the surface of liquid in the tank; the improvement comprising blade means extending from adjacent said side wall and adjacent said opening a substantial distance across the tank and being partially submerged in the liquid in the tank, jets on one side of the blade means and directed away from the blade means thereby to move scum toward the opposite side of the blade means, and jets on said opposite side of the blade means parallel thereto and directed toward said opening to move scum toward said opening.
2. Apparatus as claimed in claim 1, and a second tank, said opening communicating between the said first-named tank and said second tank, draw-off means for the scum in the second tank, and means defining a passage from the second tank, below said opening, into the first tank.
References Cited by the Examiner UNITED STATES PATENTS 838,626 12/1906 Kirby 210-221 X 2,090,384 8/1937 Durdin 210-197 2,095,394 10/ 1937 Morehead 210242 2,975,791 3/1961 Pansini 210169 X 3,152,076 10/ 1964 Kreutzer 2l0-242 X REUBEN FRIEDMAN, Primary Examiner. ROBERT E. BURNETT, Examiner.
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|US838626 *||Dec 17, 1903||Dec 18, 1906||Edmund B Kirby||Separating-tank.|
|US2090384 *||Dec 18, 1935||Aug 17, 1937||Chicago Pump Co||Sewage treatment apparatus|
|US2095394 *||Aug 6, 1935||Oct 12, 1937||Link Belt Co||Floating skimmer|
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|US3152076 *||Mar 17, 1961||Oct 6, 1964||Kreutzer Walter A||Swimming pool surface cleaning apparatus|
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|U.S. Classification||210/195.1, 210/513, 210/197, 210/540|
|International Classification||B03D1/08, B03D1/02|
|Cooperative Classification||B03D1/02, B03D1/08|
|European Classification||B03D1/02, B03D1/08|