Storage space for liquids, with a flushing device

Details Storage space for liquids, with a flushing device Storage space for liquids, with a flushing device

1986-09-22

1989-01-31

Hornsby, Harvey C.

Cleaning and liquid contact with solids

Apparatus

For work having hollows or passages

134182, 210164, 210 98, 210128, 210534, 137397, 405 43, B08B 304

Patent

active

048009075

DESCRIPTION:

BRIEF SUMMARY
The invention concerns a storage space for liquids, especially a rain-basin or sewer-backup space, with at least one flushing chamber that is positioned at the maximum height of the bottom of the storage space, that can be filled with storage liquid, and that emits the storage liquid in the form of a torrent of flushing water through at least one flushing opening when the storage space empties.
Storage spaces for liquids are employed wherever suddenly occurring large volumes of liquid have to be accommodated and returned to the system subsequent to a delay to prevent undue stress on downstream equipment.
Liquid-storage spaces of this type are frequently employed as rainwater-retention basins, rainwater-clarification basins, rainwater-overflow basins, and backup canals for effluent disposal.
When rainfall is heavy and long-lasting, large volumes of rainwater or of mixtures of waters of different provenances suddenly occur, exceeding the capacities of the sewer mains and treatment plants by a multiple factor. These sudden expansions are accommodated by means of temporary storage in and returned to the system subsequent to a delay in rain basins or sewer-backup spaces for example and returned to the system subsequent to a delay.
The large volumes of water that occur in the storage spaces are accompanied precisely at the commencement of the precipitation situation by a considerable load of contamination because the contaminants deposited in the sewage system become entrained by the initial sudden increase in rainwater.
Most of the contamination settles to the bottom while the liquid is being stored and creates sludge that must be eliminated through the runoff when the storage spaces are emptied. Since, however, the outflow in the storage space is too weak and the associated sweeping force of the water insufficient to transport the deposits, most of the bottom sludge remains once the storage space has emptied. Thus, rain basins are equipped with scrapers or sprays to clean the bottom, although they are considerably expensive to install and involve the application of external power.
The use of a flushing table positioned above the bottom in the vicinity of the intake and extending across the basin is known from Swiss Pat. No. 590 980. The flushing table is filled with water from above and can be pivoted 90.degree. around its axis. Its center of gravity when empty or partly full does not coincide with its center of gravity when full. The axis can be positioned between the two centers of gravity at a point that will prevent imbalance until the filling process has been completed, at which time the table will tilt, generating a flushing torrent against the wall of the basin. The water flows down along the wall, over a curved transition between the wall and the bottom of the basin, and then at high speed along the bottom, removing the deposited contamination and conveying it to the basin outlet. The emptied flushing table will then pivot back automatically into its horizontal position, and the process can be repeated.
The known flushing table has several drawbacks.
a. It necessitates a complicated water-level detector to trigger the filling process once the basin has completely emptied. Extensive mechanisms and controls are necessary along with their associated electric connections.
b. Since the capacity of the flushing table is limited by mechanical considerations, two or three flushing processes per flush are necessary.
c. Supply lines for filling up the flushing table are necessary, increasing the overall cost of the basin.
d. The flushing table is filled with either potable-quality water, which makes for very high operating costs, with mixtures of waters of different provenances, or with groundwater. Additional pumps with their associated electric controls are then needed of course to raise the water to the level of the flushing table from the bottom of the basin.
Storage basins with the bottom broken up in the form of humps and grooves and with flushing chambers that can be filled when necessary with clean water

REFERENCES:
patent: 4136010 (1979-01-01), Pilie et al.
patent: 4144170 (1979-03-01), Dunkers
patent: 4225434 (1980-09-01), Ernst et al.

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