DE102005048764B4 - Combined longitudinal sand trap and grease trap - Google Patents

Abstract

combined Longitudinal sand trap (1) and fat catch (2) with a longitudinal flow roller (8) in the sand trap (1) in the direction of the flow (11) in sewage treatment plants, Water purification plants or the like, formed from a canal-like, longitudinally traversed sand trap (1) and arranged in parallel, with the sand trap (1) over in a Partition (3) arranged openings (4) associated fat catch (2), wherein the flow roller (8) in the sand trap (1) by suitable fluid (7) is producible, characterized in that the fat catch (2) by a or more, over the length the fat catch (2) arranged distributed partitions (9) in several separate Basin sections (12) is divided.

Description

The The invention relates to a combined longitudinal sand trap and grease trap in sewage treatment plants, Water purification plants or the like according to the preamble of Claim 1.

Such a combined longitudinal sand trap and fat catch is by the DE 32 07 658 A1 known.

at such sand traps becomes a flow roll longitudinal by suitable fluid generated. The rotational speed of the roller is essential here higher than the longitudinal speed the flow of flow, so that the roll flow to determining known

There the sand deposition is essentially a function of a flow velocity or a corresponding surface charge can, with this approximate uniform rotation speed the appropriate sand removal can be determined and the Sand trap and the sand trap performance are measured. This method represents a proven solution for the Problem of uniform deposition of sand at uneven, before all with fluctuating flow represents.

The usual fluid are either side venting devices and / or propellers and / or guide devices.

Frequently becomes no even flow roll over the longitudinal extension the sand trap sought or realized, but it is for example an increased at the beginning of the sand trap Air supply and thus a higher Roller speed selected. Due to the uneven roll flow in the Sand trap changed also their influence on the grease capture flow along the Sand trap.

Of the known sand trap is in a unit with a parallel grease trap combined. About openings in the partition between sand and fat catch the fat catch is with the sand trap hydraulically connected and has a substantially identical Water level up. The openings mentioned are not enough to the water level, to the shooting of the sand trap roller in the To prevent fat catching. The openings are in general partially closed with lamellar elements, so that the flow the sand trap for this reason only to a limited extent in the Sand trap spreads. Across from the highly turbulent flow in the sand trap there is a substantially very calm in the fat catch flow with sometimes very small Flow velocities over which Character is little known. The effect of fat capture is in itself undisputed, but its design according to numerous rules follows mainly empirical guidelines. Because of the unknown flow conditions one can use the fat catcher not measured according to the known rules of flotation. A summary of the hydraulic conditions is not known.

The crosscurrents reach in comparison with the total flow in an individual case and / or locally one considerable size and persist again from differently sized, inward or outward directed Partial flows.

Of the Invention is the object of the known combined Longitudinal sand trap and grease trap to make the grease trap so that the flow in the fat catch uniform and even and thus accessible to a design becomes.

These Task is with a combined longitudinal sand trap and fat catch after Claim 1 solved.

Further advantageous embodiments of the invention are in the claims 2 to 10 called.

in the Fat catch prevail in very different and unexpected cases Partial flows, but in no case a whatsoever, general and uniform flow pattern over the whole extent of the fat catch.

Surprisingly Within the fat trap, there are also significant longitudinal flows in, if appropriate both longitudinal directions in unmistakable Variety depending on the length and geometry of the plant, according to the size and arrangement of the openings and lamellas, according to size and type of flow and Swirling flow. additionally are the expected, but their distribution, size and direction after unknown currents (Crossflow) through the openings through. These in turn directly affect the longitudinal flow in the sand trap itself increase to Even the actual part Flow in the Sand trap. This reduces its separation efficiency. In the circle conclusion to it becomes then again the flow affected in fat capture.

The advantages achieved with the inventive concept lie in the unique hydraulic characteristics of the fat catch and the possibility of its dimensioning according to the rules of hydraulics. It is now also possible to subsequently change the effect of the grease trap on the basis of the operating results, for example by changing the slats to achieve a higher or lower cross flow. This can also be done differently for the individual pelvic sections. advantage is also the fact that in existing plants by simple means, namely by the installation of partitions, the inventive idea can be realized. Most advantageous, however, is that with the inventive concept, the fat separation can be significantly improved as such, since now for the fat separation favorable flow conditions can be achieved in the fat trap.

in the The following will alternate between one or more partitions and Basin sections spoken. Your number in each case appropriate number can be specified or retrofitted be in order to economically achieve the desired hydraulic improvement and fat separation to achieve, namely the flow in the fat catch to improve and optimize.

The Invention is shown schematically in the figure. Show it from the sand and fat catch:

1 : a cross section

2 : a top view.

The sand and fat catch is through the outer walls ( 8th ) and the inclined floor ( 15 ) educated. The liquid has an open water level ( 6 ) on. In the sand trap ( 1 ) the flow roll ( 8th ) in this case by blown air from an air line ( 7 ) generated. In this case, transported in a known manner, the rising air, the liquid with upwards. For continuity reasons and favored by the shape of the pelvic cross-section, the liquid in said flow roll ( 8th ) in the upper area to the other side of the pool, there again down and back to the exit area. According to the invention, the rotational speed of the roller is substantially higher than its longitudinal speed. The rotational speed is therefore the decisive for the action of sand deposition speed.

The air line ( 7 ) can be of uniform diameter or, as in 1 shown from line sections ( 7.1 . 7.2 . 7.3 ) with different diameters and / or sections with different drilling plans, which is not shown here. At the sand trap end, the air duct and ventilation may be omitted. With these measures, sections of different aeration and thus in the associated pelvic sections ( 13 ) a different thickness of the flow roll ( 8th ), so that, for example, the sand trap end down a lower circulation prevails and already settled sand is not entrained again.

The adjacent fat catch ( 2 ) is supported by outer walls ( 14 ), the partition ( 3 ) and the inclined floor ( 15 ) educated. It is separated by one or more partitions ( 9 ) into two or more basin sections ( 12 ), which are completely separated hydraulically. The pelvic sections ( 12 ) are above the openings ( 4 ) in the partition ( 3 ) hydraulically with the sand trap ( 1 ) in connection. The openings ( 4 ) are well below the liquid level ( 6 ) and with lamellae ( 5 ) partially closed. The openings ( 4 ) should on the one hand as large as possible sand and fat trap connect to each other, on the other hand, the cross-flow ( 10 ) limit. That's why the opening ( 4 ) partially closed with lamellae, which the free cross-section of the opening ( 4 ) reduce evenly.

If the partitions ( 9 ) and thus the pelvic sections ( 12 ) in bold ( 2 ) approximately according to the pelvic sections ( 13 ) in the sand trap ( 1 ) are placed in the pelvic sections ( 12 ) each have their own flow conditions. In addition, the direct flow exchange between the individual basin sections ( 12 ), so that in the pelvic sections ( 12 ) can express a roll flow. Even with a different arrangement of the intermediate walls ( 9 ) will appear in the pelvic sections ( 12 ) each set its own flow, usually in the form of a roller flow. This roll flow in the single basin section ( 12 ) is in each case characteristic of the flow roll ( 8th ) in the associated basin section ( 13 ).

In accordance with the rules, the separated fat accumulates in the pelvic sections ( 12 ) at the water level ( 6 ). The fat is removed from there, for example by skimming or clearing. For this purpose, a longitudinally movable clearing device, not shown here, can be used. Preferably, the fat can be pushed to the front side of the sand and fat trap and removed there with a dozer blade. For this purpose, the upper part of the partition ( 9 ) preferably hinged, namely, for example, as a flap ( 16 ), be formed. The flap may preferably also consist in a simple form of a total of an elastic part, which with the upper part of the partition ( 9 ) connected is. The flap or flaps ( 16 ) are deflected by the passing clearing device and automatically brought back into their closed position either by their elastic return or by a separate return device. The clearing device thus moves over all pelvic sections in a single operation ( 12 ) away.

Since it is the object of the invention to provide defined and uniform flow conditions in the grease trap, it is particularly advantageous viewed when the openings ( 4 ) over the entire length (L) between two partitions ( 9 ) of the respective section ( 12 ) of the fat catch ( 2 ). This is not shown in the picture. Rather, the figure shows a commonly chosen formation of the opening ( 4 ) in the partition ( 3 ). The result is in the corner between partition ( 3 ) and intermediate wall ( 9 ) Flow vortices, which the uniform flow through the opening ( 4 ) to disturb. The degree of the disturbance is understandably dependent on the dimensions and the size of the cross flow and therefore plays a larger or smaller role in individual cases.

1

sand trap

2

grease trap

3

partition wall

4

Opening (in the partition)

5

slats

6

water level

7

air line

8th

flow roller (in the sand trap)

9

partition

10

crossflow

11

Flow flow (in Sand trap)

12

Beck section (in bold)

13

Beck section (in the sand trap)

14

exterior walls

15

ground

L

Length (of Basin section in the fat catch)

Claims (10)

Combined longitudinal sand trap ( 1 ) and fat catch ( 2 ) with a longitudinal flow roll ( 8th ) in the sand trap ( 1 ) in the direction of the flow ( 11 ) in sewage treatment plants, water purification plants or the like, formed from a channel-like, longitudinally-traversed sand trap ( 1 ) and a parallel thereto, with the sand trap ( 1 ) in a partition wall ( 3 ) arranged openings ( 4 ) associated fat catch ( 2 ), wherein the flow roll ( 8th ) in the sand trap ( 1 ) by suitable fluid ( 7 ) is producible, characterized in that the fat catch ( 2 ) by one or more, over the length of the fat trap ( 2 ) distributed partition walls ( 9 ) into several separate basin sections ( 12 ) is divided. Longitudinal sand trap and grease trap according to claim 1, characterized in that the openings ( 4 ) with slats ( 5 ) are partially closed. Longitudinal sand trap and grease trap according to claim 1 or 2, characterized in that the openings ( 4 ) over the entire length (L) between two partitions ( 9 ) of the respective section ( 12 ) of the fat catch ( 2 ). Longitudinal sand trap and grease trap according to claim 1 to 3, characterized in that the intermediate walls ( 9 ) are arranged where the size of the flow roll ( 8th ) in the associated basin section ( 13 ) of the longitudinal sand trap ( 1 ) changes by mechanical specifications. Longitudinal sand trap and grease trap according to claim 4, characterized in that the position of the intermediate walls ( 9 ) and thus the pelvic sections ( 12 ) of the fat catch ( 2 ) next to the pelvic sections ( 13 ) of the longitudinal sand trap ( 1 ) are arranged. Longitudinal sand trap and grease trap according to claim 5, characterized in that to the individual pelvic sections ( 13 ) of the longitudinal sand trap ( 1 ) arranged basin sections ( 12 ) of the fat catch ( 2 ) by one or more intermediate walls ( 9 ) are divided into two or more subsections. Longitudinal sand trap and fat trap according to one of claims 1 to 3, characterized in that the pelvic sections ( 12 ) of the fat catch ( 2 ) are arranged approximately uniformly over the length of the fat trap. Longitudinal sand trap and grease trap according to one of claims 1 to 7, characterized in that the uppermost part of the intermediate walls ( 9 ) as a flap ( 16 ) is trained. Longitudinal sand trap and grease trap according to claim 8, characterized in that the flap ( 16 ) consists at least partially of an elastic material. Longitudinal sand trap and grease trap according to one of claims 1 to 9, characterized in that the intermediate walls ( 9 ) flush with the adjacent partition wall ( 3 ), a floor ( 15 ) and an outer wall ( 14 )) and connect the pelvic sections ( 12 ) of the fat catch ( 2 ) completely separate hydraulically.