Liquid purification or separation – Gravitational separator – Material supply distributor
Patent
1993-11-15
1995-06-13
Upton, Christopher
Liquid purification or separation
Gravitational separator
Material supply distributor
210540, B01D 2124
Patent
active
054239869
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for the removal of clear waste water from circular tanks having a central waste-water inlet.
Many clarification tanks have a circular gutter at the rim of the tank as drain. Under the hydraulic gradient, clear water flows over a straight or serrated dentated sill. The amount removed increases with the degree of flooding. The circular clarification tank functions optimally only if the source flow from the central structure is able to drain in a uniformly distributed manner in all directions.
On the one hand, said drain is unfavorably affected by algae growth in the region of the dentated sill. On the other hand, even small flows in the water surface, such as, for example wind, alter the symmetry. In the most unfavorable case, about half the gutter circumference remains unused (completely different wind conditions on the leeside compared with the weather side). This means that double the amount drains off via the remaining part, while the settling efficiency is reduced at the leeside. Floating sludge is entrained to a greater degree and the user is saddled with higher costs.
Further difficulties are to be perceived in the fact that the dentated sill installation requires expensive leveling for the abovementioned reasons. In addition, the water level cannot be controlled separately from the amount drained. A high drainage loading with solids is to be expected in addition to a high expenditure on cleaning the gutters.
In contrast, the object of the invention is to even out the amount drained and at the same time to increase it, and to render the water level in the circular tank independent of the take-off of the clarified waste water.
Surprisingly, this object is achieved by a completely filled submerged pipe which is arranged underneath the surface of the clarified waste water in order to draw off the clarified waste water uniformly, the drainage of the latter being regulable independently of the supply tank by means of a control system.
A uniform regulable amount is therefore drained from underneath the surface of the clarified waste water.
The drainage may be volume-controlled.
In general, the volume control is carried out by altering the difference in height between the water level in the tank and the water level in the drain.
Preferably, the submerged pipe is constructed as a ring conduit having perforations at an equal distance from one another.
It is beneficial if the ring conduit is connected by means of an efflux collecting conduit to a drainage duct arranged outside the circular tank.
Expediently, a drainage device is provided which is adjustable in height with respect to the drainage duct.
In general, the ring conduit will be arranged equidistantly from the central inlet.
If the pipe openings and pipe diameters are correctly dimensioned, a single drainage conduit through the tank wall may be sufficient. Said drainage conduit leads to an overflow sill which is regulated independently of the water level. The drainage device itself may be a regulating sill.
The volume control can be carried out by altering the difference in height between the water level in the tank and the water level in the drain.
As a result of the measure according to the invention, the water level in the tank can be varied.
The internal pipe pressure can be set high enough at the pipe circumference to guarantee, in addition, discharge under pressure at the pipe end. The drainage velocity at the outlet from the pipe conduit can be maximal, while its outlet [sic] diametrically opposite said outlet can be close to zero.
The flooding above the submerged pipe can be regulated independently of the amount discharged.
In a further development according to the invention, the circular tank may also be used as a buffer tank.
No pump is provided.
The difference in height is responsible for the gradient and also for the velocity. The regulation can be carried out automatically, if desired, by raising and lowering the drainage device.
The outlet having submerged pipes can preferably be operated together wit
REFERENCES:
patent: 1456759 (1923-05-01), Booth
patent: 2502490 (1950-04-01), Sweet
patent: 3447688 (1969-06-01), MacCabe
patent: 4278541 (1981-07-01), Eis et al.
patent: 4592845 (1986-06-01), Lejeune et al.
patent: 4994179 (1991-02-01), Keeter et al.
patent: 5154835 (1992-10-01), DeMichael
patent: 5300220 (1994-04-01), McEwen
Hans Huber GmbH & Co. KG
Upton Christopher
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