Liquid purification or separation – Structural installation – Flume stream type
Patent
1994-07-20
1996-02-13
Upton, Christopher
Liquid purification or separation
Structural installation
Flume stream type
210162, 210170, 210413, B01D 7701
Patent
active
054909228
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The invention relates to a waste water plant, comprising a discharge basin, connected to at least one inflow pipe and at least one outflow pipe, and a mesh screen unit, which is disposed in said discharge basin and which includes a mesh screen, comprising parallel screen bars, and a cleaning car, which can be moved back and forth and to which is attached a cleaning comb, which is arranged with teeth between the screen bars of the mesh screen.
BACKGROUND ART
Waste water plants with mesh screens, which are installed according to the dimensioned channels, in order to retain bulky floating debris, such as pieces of wood, plastics, paper and the like, are well-known. In these plants so called flood discharges, through which a portion of the rain water mixed with sewage is discharged when there is heavy rainfall, are installed at different points. To avoid the discharge of sewage and rain water loaded with floating and suspended debris, so called discharge basins can be assigned, in which the mixed water is stored. With respect to a waste water plant of the aforementioned kind, a mesh screen unit is known from the EP-A 0 358 952. Said mesh screen unit comprises a mesh screen, which consists in essence of parallel screen bars, between which are arranged triangular teeth of a cleaning comb, which can be moved back and forth and is intended for cleaning the screen bars.
DISCLOSURE OF THE INVENTION
The invention is based on the problem of improving a waste water plant of the aforementioned kind to the effect that while avoiding the risk of backwater and without reducing the volume of impoundment even when the rain weather persists for a long time, in particular, however, during thunder storms, the volume of mixed water, which accumulates in a relatively short period of time and is heavily loaded with floating debris, can be absorbed and, liberated of the floating debris, can be discharged as cleaned waste water.
This problem is solved according to the invention by means of the features stipulated in patent claim 1. Advantageous embodiments of the invention follow from the dependent claims.
While retaining an optimal cleaning effect, the passage rate can be smoothed out and the pressure can be distributed more uniformly over the entire surface of the mesh screen unit with the invention.
BRIEF DESCRIPTION OF THE DRAWINGS
Other features of the invention follow from the following description with reference to the drawings.
FIG. 1 is a diagrammatic sectional view of a fragment of a first embodiment of a waste water plant with built-in mesh screen unit.
FIG. 2 is a top view of the waste water plant according to FIG. 1.
FIG. 3 is a diagrammatic sectional view of a fragment of a second embodiment of a waste water plant.
FIG. 4 is a top view of the waste water plant according to FIG. 3.
FIG. 5 depicts a modification of the embodiment according to FIGS. 1 and 2;
FIG. 6 depicts a modification of the embodiment according to FIGS. 3 and 4.
BEST METHODS FOR CARRYING OUT THE INVENTION
FIG. 1 is a diagrammatic sectional view of a fragment of a waste water plant, which is denoted in its entirety as 50 and which consists in essence of a retarding basin 10, a part of which is illustrated, and a discharge basin 20, which is connected to said retarding basin by way of an overflow opening 22'.
The discharge basin 20 has a bottom 21 and two side walls 22 and 23, which are spaced apart; a front wall 19 and a rear wall 18 and a partition 24, which is arranged in the illustrated example in the longitudinal direction of the discharge basin 20. A basin chamber 25, formed by the bottom 21 and by the side walls 22 and 23 and by the front wall and rear wall 19, 18 as well, is subdivided by means of the partition 24 into a storage space (inflow space) 25' and an outflow space 25". The overflow opening 22' extends virtually over the entire length of the side wall 22. The storage space 25" is connected to an inflow pipe 26, which penetrates the front wall 19, and an outflow pipe 27, which penetrates the rear wall 18. An
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Romag Rohren und Maschinen AG
Upton Christopher
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