NL8202978A - SEPARATING DEVICE, IN PARTICULAR FOR SEPARATING OIL AND SAND FROM WASTEWATER. - Google Patents

Description

ί <D Ho: Se / Sjaelland-l

Separation device, in particular for separating oil and sand from waste water.

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The invention relates to a separating device j. in particular intended for separating oil and sand from waste or sewage comprising a settling tank with an inlet; and an outlet, between which and below the liquid level in the tank, a system of plates is arranged, which is inclined. ! . is relative to the vertical plane and which plates are arranged parallel to each other in the main flow direction through the tank,

The separation in such a separation device is effected by the transverse sedimentation and transverse flotation. Separators of this type are known both in the form of stationary installations underground and in the vprm of pre-fabricated tanks, which are placed at ground level and are distinguished by a considerably greater separation capacity compared to settling tanks, which are only equipped with various forms of vertical divider walls to retain individual media in the tank. This improved separating capacity by means of inclined plates is due to the fact that 20 lighter components of the liquid such as oil calm down to; the surface may rise while the heavier components such as sand can sink undisturbed to the bottom of the tank since rise heights and drop heights are limited to the vertical distance between the inclined plates or slats. Due to the inclination of the plates, rising oil droplets and falling grains of sand during the entire movement towards the surface of the liquid or towards the bottom of the tank are in a boundary layer i and do not tend to be gripped and solidified. through the flowing liquid.

It is normal practice that normal rain-water from cities is also fed to receiving systems after the - 8202978 i i 'Λ -2- passage through sand scavengers and oil separators! in order to limit the pollution of the receiving system. · Since the well-known specially manufactured bez- ·· I tanks with plate systems are relatively complicated and expensive; r 'i ί 5 :. they have so far only been used for special 'i. .! purposes, such as the clarification of industrial wastewater; ll. ·. i i installations and the like, while despite their advantages I have found no application for instance for sedimenta-r; % 1; tanks in treatment plants and for purifying rainwater. . | : j The aim of the invention is a divorce. or to provide a separation device that meets the increasing requirements imposed on the purification of waste and sewage.

According to the invention this is achieved by this; perform the task with a flow-through tank and by forming the plate system by one or more prefabricated modules of plate stacks dimensioned to fit in mass-produced standard tanks.

20 By combining a normal type of tank and setting up a sloping plate system by means of pre-manufactured modules, which can be inserted through the normal openings of the tank and which can be mounted within the tank by simple means, a cheaper and obtained better sand and oil separator, with associated environmental benefits.

The modules can be placed in existing tanks. low cost and can be exchanged at any time without labor-intensive operations.

According to the invention, an embodiment of a module may include one or more frames for mounting the stack of plates and individual plates may be attached to the frame or frames at their top and bottom edges.

A module can be made of different types of materials, for example steel, metal, plastic and the like, provided the material itself or a coating 8202978. '· ··· * ·'. ·. '..'.> 5. · '· 4 -μ- -3- is resistant to the substances to be separated.

The plates in the module can be flat, some- what; be ribbed or have stiffening punches in front; see. Such ridges or ribs and stiffening punches -5 'may be transverse to the direction of flow through the i. ; tank. |

The invention will be explained with reference to the drawing; clarified. I.

j i 'i In the drawings shows:

j10; Figure 1 shows a schematic perspective view I.

J? of a plate module,! ! · F! 1 - Figure 2 is a vertical cross-sectional view; of a complete separating device with two plate modules, Figure 3 is a cross-sectional view along line 15 III-III of Figure 2,

Figure 4 is a cross-sectional view of separator with three rows of plate modules and

Figure 5 shows a plate module of a different embodiment than that according to Figure 1.

In Fig. 1, reference numeral 1 designates a plate module, which consists of two rectangular frames 2 in which and between which plates or slats 3 are arranged which are inclined relative to the sides of the frames.

For example, the tilt can be about 45 °.

The plates are arranged parallel to each other and equidistant from each other. Frames 2 and plates 3 may be of plastic, metal or steel and may themselves be corrosion resistant to the fluids to be treated or may be coated with a material having the desired corrosion resistance has.

Depending on the material used for the plates and frames, the plates can be attached to the frames by gluing, soldering or welding and if desired, the plate edges can fit into small notches in the inner frame edges, as for example in point 4.

8202978 v * «« -4-. ! Figures 2 and 3 show a system of two plate modules 1 in a settling tank. The tank is of a known type mainly manufactured from standard elements, such as rings 5, a bottom 6, a top cone 7 (all of concrete) and; : '* .1 5 with an inlet 8 and an outlet 9.! .

In the bottom of the tank there is a sink 10 for the accumulation of heavier components of the medium, eg sewage, which must be purified.

i10; The two plastic modules 2 have dimensions; ; allowing it to pass through the top opening of; . · The tank is inserted and they are mounted above the top edge of the settling pit, the plates being parallel to the flow direction. The modules can be placed; 15 on bars arranged in the flow direction and attached to the tank wall or to the partition walls 11 or only to the top edge of the settling pit 10, see FIGS. 2 and 3.

The protrusions 23 (fig. 2) on the frames 2 are provided for holding the module 1 in a place on two bars mounted on the lower corners of the module frames.

In the tank, on either side of the modules 1, there is a dividing wall 11, which extends over the entire length of the tank below the top edge of the settling pit. provided with rectangular openings 12, which correspond to the periphery of the modules according to fig. 3.

The partitions 11 divide the tank into three chambers i.e. an inlet chamber 13, a separation chamber 14 and an outlet chamber 15. The settling tank functions as follows.

Waste or sewage water is introduced into the tank via the inlet 8 and is down through the first partition wall 11 through the inlet chamber 13, through the opening 12 in the first partition wall 12, through the module plate stacks 3, through the opening 35 12 in the second dividing wall 21, guided upwards through the outlet chamber 25 and outside through the outlet 9.

During passage through the plate modules 1; V. '; . ·.

n * -5- an efficients separation takes place partly from the lighter, parts and partly from the heavier components such as t | oil and sand from the sewage. The lighter components rise along the inclined plates in the modules and collect at the top of the separation chamber 14, while the heavier; sinking other components along the plates and collecting; ; in the decanter. 10. {'

Figure 4 shows a system of plate modules in a standard tank of a larger type constructed of rings <10: 16 and provided with a flat cover 17 with an opening it '. ; 18. This tank differs from the tank according to figures 2 and 3 in that three rows of plate modules 1 are arranged, which are laterally spaced from each other. Each row can consist of three separate modules 1.

In each of the partition walls 11 there are openings 12 corresponding to the three rows of modules. The partition walls 11 in Figures 2, 3 and 4 can be made of plate sections, which can also pass through the opening 18 in order to be assembled in the tank itself and affixed to the walls of the tank.

Figure 5 shows an embodiment of a plate module 19, which is made entirely of steel.

Each frame consists of two profile irons 20 connected by bars 21 and which bars extend over the corresponding edges of the steel plates 22 and are welded thereon, while the opposite plate edges are welded to the profile irons. The top and bottom edges of the plates 22 may be appropriately curved. The entire module according to this embodiment is treated or coated such that the module is resistant to corrosion for the medium to be purified.

8202978

Claims (2)

1. Separation device, preferably for separating oil and sand from waste water, comprising a . settling tank with an inlet and outlet, between and below; | the liquid level in the bank is a system of plates; . . 5, which plates are inclined relative to the vertical plane and are arranged parallel and at a distance from each other and parallel to the main flow device by the tank; j, characterized in that the tank: (5,16) is constructed as a flow-through tank and that it; plate system is formed by one or more prefabricated modules (1,19) of stacks of plates (3,22) dimensioned to fit into mass-produced standard tanks. Separating device according to claim 1, characterized in that a module (1,19) consists of one or more 15 frames (2,20,21) for fixing the stack of plates (3,22) and that the separate plates (3,22) at their top and bottom edges are attached to the frame or frames / (2,20,21).