CH648536A5 - Separator for separating a denser component and a lighter component of a liquid - Google Patents

Abstract

The separator comprises a sedimentation storage vessel (5) through which the liquid flows with an entry (8) and an exit (9). Two modules (1) of stacks of plates are placed in the passage of the liquid. The plates are oblique in relation to the vertical plane and are separated and parallel to one another and to the general direction of the flow. Two vertical separating partitions (11) determine, with the walls of the storage vessel (5, 16), entry (13) and exit (15) chambers extending above the level of the plates (8, 22) as far as the entry and the exit (9); they have rectangular entry and exit openings (12) corresponding to the perimeters of the ends of the stacks of plates and arranged facing these ends of stacks of plates. <IMAGE>

Description

Disclosed is a separator for separating a heavier component and a lighter component from a carrier liquid, comprising a sedimentation tank through which the liquid flows with an inlet and an outlet and, placed in the passage of the liquid between inlet and outlet, a device of one or more prefabricated modules of stacks of plates, which are oblique to the vertical plane, spaced and parallel to each other and to the general direction of flow at through the part of the tank in which the plate device is placed.

The separation takes place in such a separator by transverse sedimentation and by transverse flotation, respectively.

Separators of the type mentioned above are known both in the form of stationary installations below ground level and in the form of prefabricated basins placed at ground level (see English Patent No. 1,428,403). They are characterized by a much greater separation capacity in comparison with clarification tanks, which are equipped only with various forms of partitions for the retention of separated media in the tank. This improved separation capacity by means of oblique plates is due to the fact that the lighter constituents of the liquid, such as oils, can quietly rise to the surface, while the heavier constituents, such as sand, can descend without disturbing the bottom of the pool, because the ascent and descent levels are respectively reduced to the vertical distance between the oblique plates or slats. As a consequence of the oblique position of the plates, the ascending drops of oil and the descending grains of sand, during their entire movement towards the surface of the liquid and downwards respectively, are in a boundary layer, and do not tend to be caught and entrained by the circulating liquid

In practice, rainwater from urban areas is commonly routed to container systems after passing through sand beds and oil separators, to reduce pollution from a receiving container.

Since the known sedimentation tanks, specially constructed with plate systems, are relatively complicated and expensive, they have so far been used only for special operations such as clarification of sewage, factory waste water , etc., while, despite their apparent advantages, they have found no general application for, for example, sedimentation basins in purification plants and for the purification of rainwater.

The object of the invention is therefore to design a separator capable of meeting the increasing requirements for the purification of sewage and residual water. This object is achieved by the separator defined in claim 1.

By the combination of a common type basin and the installation of a transverse plate device by means of prefabricated modules which can be passed down through the normal openings of the basin, and mounted inside the basin by simple means, a better and less expensive oil and sand separator is produced, with the resulting advantages for the ambient environment. Thus, the modules can be placed in existing basins at insignificant costs and can be exchanged at any time, without extractions requiring a lot of labor. One embodiment of the module may include one or more frames for mounting the plate assemblies, and each plate may be individually attached at its upper and lower ends to the frame (s).

A module can be made of various materials, for example steel, metal, plastic, etc., provided that the material itself, or a coating applied to it, is resistant to the medium to be treated.

The plates in the module can be flat, slightly wavy or have reinforced perforations. Such corrugations or reinforced perforations must be oriented transversely to the direction of flow through the basin.

In the following, the invention is explained by way of example with reference to the drawings.

Fig. 1 is a schematic perspective view of a plate module;

fig. 2 is a vertical section view of a complete separator with two plate modules;

fig. 3 is a sectional view along line III-III of FIG. 2;

fig. 4 is a sectional view of a separator with three rows of plate modules, and FIG. 5 is a plate module of another embodiment.

In fig. 1,1 is a plate module consisting of two rectangular frames 2, in which and between which are arranged plates or strips 3, oblique to the sides of the frames. The angle can be around 45 °.

The plates are arranged in parallel and at equal distances from each other. The frames 2 and the plates 3 may be made of plastic, metal or steel, and may themselves be resistant to corrosion towards the liquid composition to be treated, or else be treated and coated with a material having the desired resistance. corrosion.

Depending on the material used for the plates and frames, the plates can be fixed to the frames by gluing, soldering or welding and, if necessary, the edges of the plates can be accommodated in small indentations at the inner edges of the frames.

Figs. 1 and 3 represent an arrangement of two plate modules 1, in a sedimentation tank 5. The tank is of a common type, built mainly from standard elements, such as container ferrules 5, a bottom 6, an upper cone 7, all of concrete and having an inlet 8 and an outlet 9.

At the bottom of the basin is a bowl 10, for the accumulation of the heavier constituents of the medium such as the residual water to be purified.

The two plastic modules having dimensions allowing them to pass through the upper opening of the basin are mounted above the upper edge of the bowl, the plates being parallel to the direction of flow. The modules can be placed on bars arranged in the direction of flow and fixed to the wall of the basin or on the partitions 11, or simply on the upper edge of the bowl 10, as shown in FIGS. 2 and 3. The projections 23 (fig. 1) on the frames 2 are made for many 5

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nid the module 1 in position on two bars mounted at the lowest corners of the module frames.

In the basin is located, on each side of the series of modules 1, a partition 11 extending all along the interior of the basin,

to the upper edge of the bowl, having rectangular openings 12 corresponding to the circumference of the modules, as shown in FIG. 3. The partitions 11 divide the basin into three chambers, an inlet chamber 13, a separation chamber 14 and an outlet chamber 15.

The separation basin works as follows. 10

Sewage or residual water is sent into the basin through inlet 8 and is forced by the first partition 11 to descend into the inlet chamber 13, through the opening 12 in the first partition 11, through all the plates of the module 3, to be released through the opening 12 in the second partition 11, upwards through the outlet chamber 15 and outwards through the outlet 9.

During the passage through the plates of module 1, effective separation takes place, partly of the lighter components and partly of the heavier components, such as oil and sand, from the sewage.

The lightest components rise along the oblique plates in the modules and accumulate at the top of the separation chamber 14, while the heaviest fall at the bottom along the plates and accumulate in the bowl 10.

Fig. 4 shows an arrangement of plate modules in a standard basin of a larger type, consisting of rings 16 and having a flat cover 17 with an opening 18. This basin differs from the basins of FIGS. 2 and 3 by the fact that three rows of plate modules 1 are arranged spaced next to each other. Each row can consist of three unique modules 1.

In each partition there are openings 12 corresponding to the three rows of modules.

The partitions 11 in FIGS. 2, 3 and 4 can be made of sections of plates which can also pass through the opening 18 for assembly in the basin itself and for fixing to its walls.

Fig. 5 shows an embodiment of a plate module 19 made entirely of steel. Each frame consists of two iron angles 20, connected by the bars 21, which pass through the edges of the steel plates 22 and are welded to it, while the opposite edges of the plates are welded to the angles. The lower and upper edges of the plates 22 can advantageously be folded in the manner illustrated. The entire module of this embodiment is treated or coated so as to be resistant to corrosion by the medium to be purified.

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3 sheets of drawings

Claims (2)

648,536 2 CLAIMS 1. Separator for separating a heavier component and a lighter component from a carrier liquid, comprising a sedimentation tank (5, 16) through which the liquid flows with an inlet (8) and an outlet (9) and, placed in the passage of the liquid between the inlet and the outlet, a device of one or more prefabricated modules of stacks of plates (3, 22), which are oblique to the vertical plane, spaced apart and parallel to each other other and in the general direction of flow through the part of the tank in which the plate device is placed, characterized in that the tank (5, 16) comprises two vertical partitions (11) of separation, which delimit with the walls of the reservoir (5.16) of the inlet (13) and outlet (15) chambers extending above the level of the plates (3, 22) up to the inlet (8) and at the outlet (9), the partition walls (11) having rectangular openings (12) for entry and exit, corresponding to the perimeter s of the ends of the stacks of plates and arranged opposite these ends of stacks of plates. 2. Separator according to claim 1, characterized in that the or each module (1, 19) comprises one or more frames (2, 20, 21) for mounting the plates (3, 22), and in that the individual plates (3, 22) extend across the frame (s) and are fixed at their upper and lower edges to the frame (s) (2, 20, 21).