Claims
- 1. An apparatus for oxygenating liquid sewage, comprising:
- means for supplying a pressurized oxygen-containing gas, said means including an orifice for issuing a continuous stream of said gas upwardly from below the top surface of a volume of liquid sewage;
- a first funnel means;
- means to secure said first funnel means at a location downstream from said orifice, said first funnel converging in the downstream direction, the upstream opening of said first funnel comprising a first inlet for entraining liquid sewage into said first funnel by gas issuing in the downstream direction from said orifice;
- a second funnel extending downstream from the downstream opening of said first funnel means;
- means to secure said second funnel means in a predetermined relationship to said first funnel, said second funnel converging in the downstream direction, the upstream opening of said second funnel comprising a second inlet for entraining liquid sewage into said second funnel by sewage and gas issuing from the downstream opening of said first funnel;
- and an exit tube of substantially constant diameter extending both upstream and downstream from the downstream opening of said second funnel, an upstream opening cut in said exit tube comprising a third inlet for entraining liquid sewage into said exit tube by liquid sewage and gas issuing from the downstream opening of said second funnel;
- means for securing the exit tube to said gas supplying means;
- and wherein the first and second funnel securing means comprise means for mounting said first and second funnels within the upstream extension of said tube, whereby said funnels are secured in said predetermined relationship to one another and to said orifice.
- 2. The apparatus of claim 1, wherein said means for mounting said second funnel comprises means for adjusting the position of said second funnel with respect to said first funnel.
- 3. The apparatus of claim 2, wherein said adjusting means is accessible from the exterior of said tube.
- 4. The apparatus of claim 1, wherein the distance between said second inlet and said third inlet is about equal to the diameter of said tube.
- 5. The apparatus of claim 1, wherein the minimum diameter of said first funnel at the upstream opening is about one quarter of the diameter of said tube.
Priority Claims (1)
| Number |
Date |
Country |
Kind |
| 28473/70 |
Jun 1970 |
UK |
|
Parent Case Info
This application is a continuation of application Ser. No. 479,449, filed June 14, 1974, now abandoned, which was a continuation-in-part of application Ser. No. 380,694, filed July 19, 1973, now abandoned, which was a continuation of application Ser. No. 151,352, filed June 9, 1972, also now abandoned.
This invention relates to a device for continuously aerating liquids generally, and which is particularly applicable for oxygenating sewage.
Many prior art devices are known and fall into two main classes -- the trompe blowing or "burp gun" type and the continuous flow type. The apparatus of my invention belongs generally to the latter class, but differs from them because many continuous flow aerators derive -- in some measure -- from the idea found in gas scrubbers that interaction takes place at a solid interface and, therefore, larger surface areas and longer or tortuous paths are necessary.
Unfortunately, in both types the oxygen may take the form of discrete bubbles --which though small may eventually reach the surface of the liquid and escape rather than being properly dissolved to satisfy the biological oxygen demand. Yet another cause of inefficiency is that if small bubbles exist they can coalesce together and escape rather than dissolving. Long tortuous paths or a series of baffles reduce liquid flow speeds.
Of course, cutting back of aeration rate may mitigate these faults but, generally speaking, both high aeration efficiency at high aeration rates are required together.
It is therefore an object of this invention to continuously oxygenate liquid at a high rate and at high efficiency.
It is a further object of this invention to ensure even dissolving of the oxygen containing gas in the liquid and more particularly to achieve a distribution of the gas in the liquid which will inhibit coalescence of any bubbles which may have formed.
It is yet another object of this invention to provide a device for carrying out the method without any moving parts; it is another object of the invention to provide a cheap and easily manufactured apparatus for carrying out the method.
US Referenced Citations (7)
Foreign Referenced Citations (4)
| Number |
Date |
Country |
| 46,644 |
Apr 1889 |
DT |
| 545,187 |
Jun 1956 |
IT |
| 91,973 |
Dec 1921 |
CH |
| 18,525 |
Feb 1913 |
UK |
Continuations (2)
|
Number |
Date |
Country |
| Parent |
479449 |
Jun 1974 |
|
| Parent |
151352 |
Jun 1972 |
|
Continuation in Parts (1)
|
Number |
Date |
Country |
| Parent |
380694 |
Jul 1973 |
|
Patent Grant
3968086
