DE102007035081A1 - Filter grid device for removing solid matter from a mixture of solid matter and liquid in a sewage-treatment plant has a filtering device along with an emptying and conveying device for removing solid matter from the filtering device - Google Patents

Abstract

A filtering device (14) filters out solid matter. An emptying and conveying device (76) moves in relation to the filtering device, removes solid matter from the filtering device and conveys it into a device for retaining solid matter (68,82). A lower area of the filtering device is designed to protrude and curve in an upstream direction. Independent claims are also included for the following: (1) A device for separating solid matter and liquids with a filter grid device; (2) A sewage-treatment plant with a sewage sluice fitted with a filter grid device; (3) A method for separating solid matter from a mixture of solid matter and liquid; (4) A device for separating solid matter from a mixture of solid matter and liquid.

Description

The invention relates to a Siebrechenvorrichtung for the removal of solids from a solid-liquid mixture according to the preamble of the appended claim 1, as known from WO 00/48705 A is known. Moreover, the invention relates to a solid-liquid separation device provided with such a screen computing device, a sewage treatment plant provided therewith, a method for separating solids from a solid-liquid mixture, and a device for automatically carrying out this method using the screen computing device.

The invention is particularly suitable for use in mechanical wastewater treatment. In a sewage treatment plant to be clarified wastewater, especially from settlement areas, usually lead to more or less large amounts of solids with it, which must be removed before an organic clarification of the wastewater from these. For this purpose, so-called screen rake are usually used, wherein the wastewater loaded with solids in a channel or the like flows through a sieve surface in which the solids are collected. A scraper removes the solids from the screening device and guides them to further treatment. Since such solids must be disposed of, there are various options for treating the solids such that their volume and / or weight and possibly their proportion of organic constituents are substantially reduced. For this purpose, there are Rechengutwaschanlagen in the state of the art, as for example in the WO 93/01000 are described and / or Rechengutpressen, as for example from the DE 100 57 269 A1 or the DE 10 2004 038 842 B4 are known. The aftertreatments are carried out by means of machines, which are usually controlled automatically running.

A Siebrechenvorrichtung for feeding the solids from solid-liquid mixtures is from the above-mentioned WO 00/48705 known. This known Siebrechenvorrichtung has a screening device which has an obliquely upwardly inclined screen surface with upwardly extending screen bars. Next, there is a clearing device that removes solids trapped in this screen surface, and a transport device that supplies the cleared solids to a solids receiving device where the solids are further processed, such as, for example, a screenings washer or screener or the like. The clearing device has a reamer which engages the screen bars and transports the solids downwardly to the transport means present in the bottom of a sewage channel.

outgoing From this prior art, it is an object of the invention, a Screening device with the features of the preamble of the attached Claim 1, a combination of such a Siebrechenvorrichtung with a subsequent screenings aftertreatment device and a treatment plant provided therewith and a method for separating solids from a solid-liquid mixture to improve the discharge of solids.

These Task is by the devices or methods with the features solved the independent claims.

advantageous Embodiments of the invention are the subject of the dependent claims.

The Invention thus provides a screen computing device with which solids are removable from a solid-liquid mixture. For this purpose, a screening device according to the invention for screening solids and a clearing and transport facility provided, removable with the solids from the screening device and transportable to a solids receiving device.

According to the invention a lower portion of the screening device, in particular in the area a lower deflection of the clearing and transport device with provided in the upstream protruding projections.

Especially in the lower part of the solid-liquid mixture heavier and thus more difficult to remove solids. These are broken up by the projections and then are easier to remove.

If the lower area seen in the flow direction upwards bent or curved is formed, in addition an upward swirling, which is a lifting of the Favor solids for discharge.

Especially Preferably, the lower portion of the screening device, more precisely the lower area of the screen surface - like the screening device further formed downstream of the screen surface is relatively unimportant for oncoming flow - following a deflection of the clearing and transport device educated. The clearing and transport device can thus earlier, further upstream, on the screen surface attack and also the bottom of the screen surface effectively evacuate. Dead cavities, which are solid could and could accumulate easier avoided.

If, as is particularly preferred, the projections on the screening device and the clearing and gradually approaching the conveying device in the downstream and / or upward direction, a kind of funneling effect results; the solid is easily introduced in the area of the lower deflection between the clearing and transporting device, then moved upwards along the upwardly curved screening surface, while the clearing and transporting device continues to approach each other. On the other hand, it can be particularly hard solids such. As stones may be advantageous to avoid further approximation, so that no jamming occurs. This can be z. B. thereby achieve that the trajectory of the clearing and transport device and the upstream contour of the projections, possibly after a slightly further inlet for the purpose of funnel effect, maintained in the wider area an approximately equal distance. Particularly preferably, the predetermined transport path for the solids to be cleared is then transferred into a rectilinear, preferably upward and in the flow direction oblique course along the sieve surface.

The Lower deflection is preferably carried out by a lower deflection shaft. Accordingly, an approximately circular arc-shaped contour of lower portion projecting portion of the screen surface is preferred.

The Sieve surface is particularly preferably at least partially by rods extending in a vertical direction formed, the spaces between them easily by Räumharken or the like. Accordingly, it is preferred that the lower areas of the bars with the projections are provided. This is particularly easy to produce by that the lower end portions of the rods forward, in the upstream direction are curved above. This is possible Metal bars simply with appropriate bending machines accomplish, which are widely available.

Especially preferred embodiments of the invention operate such that problems in a subsequent Rechengutbehandlung not to an impairment the separation of the solids from the solid-liquid mixture to lead.

For this the clearing and transport device is preferably such designed such that the solid optionally to at least two different solids receiving means can be delivered.

This is especially in combination with the aforementioned projections interesting at the bottom of the screen surface, the Make sure that the solids even when turning in one Reverse direction in the area of the deflection the clearing and transport device remains.

Around Such optional delivery control technology possible simple and with little mechanical effort to be able to, is in a particularly preferred embodiment the invention provided that the clearing and transport device at least in two directions, namely in a first conveying direction and in a second conveying direction is movable. The clearing and transport facility is like this formed so that they move in the first conveying direction Releases solid to a first solids receiving device and when moving in the second conveying direction to a second Releases solid receiving device.

By simple change, for example reversal, the conveyor can be either the solid in the first or deliver the second solids receiving device, for example discard.

control technology So is only the already existing engine control for controlling a Motors provide the clearing and transport device, wherein by simply reversing the direction of motor rotation, the optional delivery can be done.

This The principle is particularly simple due to the design of the clearing and transport device as Harkenumlaufrechen with on a ring closed orbit circulating clearing or transport tools, especially calculating rakes, feasible.

With The advantageous embodiment of the invention is thus, so to speak created a two-way rake, different from all known computing and Screening characterized by the fact that screenings selectively in a first solids intake or a second solids intake can throw off. A change of the discharge point takes place only by swapping the direction of rotation. Especially preferred is, if the screenings selectively on an inlet side, from where the solid-liquid mixture, for example with solids laden wastewater, which is fed to the screening device, or on a drain side, where more or less of solids liberated liquid can drain, is ejectable.

• • Feststoffansammlungen im unteren Siebbereich werden vermieden.
• • Der Austrag schwerer Feststoffe wird erleichtert.
• • Die Strömung wird für den Feststoffaustrag mit genutzt, dadurch können sich Energieeinsparungen ergeben.
• • Durch eine Krümmung der Siebfläche im unteren Bereich lassen sich Feststoffe auch bei Umdrehung der Förderrichtung auch im unteren Umlenkbereich an der Räum- und Transporteinrichtung halten.
• • Auch bei umgekehrter Förderrichtung ist ein Ausräumen des unteren Bereichs der Siebfläche möglich.
• • Es besteht die Möglichkeit, im Falle einer Störung an einer nachgeschalteten Maschine (wie zum Beispiel Rechengutpresse oder Rechengutwaschanlage), durch Wechsel der Feststoffaufnahmeeinrichtung Feststoffe einer anderen Maschine oder zum Beispiel in einen zur Zwischenlagerung oder zum Weitertransport dienenden Behälter zuzuführen.
• • Bei Wartungsarbeiten an einer nachgeschalteten Maschine kann die Siebrechenvorrichtung weiter arbeiten.
• • Bei Überfüllung eines Feststoffbehälters kann zum Beispiel ein Notbehälter oder Zwischenlagerungsbehälter befüllt werden.
• • Bei einer Blockade durch einen großen Gegenstand der auch die nachgeschaltete Rechengutbehandlung stören könnte, könnte die Siebrechenvorrichtung einfach in die andere Förderrichtung betrieben werden, um den Störstoff in einer entsprechend zur Aufnahme solcher Störstoffe geeignete zweite Feststoffaufnahmeeinrichtung zu überführen.

By the invention and / or its advantageous embodiments in particular the following advantages are achieved:

• • Solid accumulations in the lower sieve area are avoided.
• • The discharge of heavy solids is facilitated.
• • The flow is used for the discharge of solids, which can result in energy savings.
• • Due to the curvature of the sieve surface in the lower area, solids can be removed even when turning around hung the delivery direction in the lower deflection at the clearing and transport device hold.
• • It is also possible to clear out the lower area of the sieve surface in the reverse direction of conveyance.
• • In the event of a malfunction on a downstream machine (such as a screener or screen washer), it is possible to transfer solids to another machine by changing the solids receiver or, for example, into a container for intermediate storage or onward transport.
• • When performing maintenance on a downstream machine, the screen calculator may continue to operate.
• • If a solids container is overfilled, for example, an emergency container or intermediate storage container can be filled.
• In the event of a blockage by a large object which could also disturb the downstream screenings treatment, the screen computing device could simply be operated in the other conveying direction in order to transfer the foreign matter into a second solids receiving device which is suitable for receiving such contaminants.

If the clearing and transport device in both conveying direction can run continuously several times, it is possible the screening device in both directions in the longer term to operate and so also solid continuously in each of the at least two To transport solid receiving devices.

For this purpose, according to an advantageous embodiment of the invention, closed to an endless loop drive means is provided by the broaching or transport tools, such as rake or the like on one of the orbit so movable that they can rotate around either in the first conveying direction or the second conveying direction An emptying of the screen surface, which in principle, as well as the broaching tools, may be formed as in the WO 00/48705 described and shown, can be in an upward movement or in a downward movement. For this purpose, it is preferably provided that broaching or transport tools, which may also be designed to intervene in interspaces between screen bars, are selectively guided upwards or downwards in a first area of an orbit close to the screen area. At one end of the screen surface, there is then a deflection of the orbit in the opposite direction, where then the clearing or transport tools are preferably moved further upstream of the screen surface at a second portion of the orbit in the opposite direction as in the vicinity of the screen surface.

advantageously, rich both parts of the orbit of the solid-liquid mixture out, more preferably above the expected level each stripping device is provided.

Of the So solid can move in one direction scratched out on the screen surface leading down and then at the further upstream Side up to be transported to a first scraper of the clearing or transport tools stripped and in the first solid receiving direction to be dropped.

at reverse conveying direction, the solid on the screen surface For example, scratched from bottom to top and continue along of the first portion located near the screen surface the orbit moves there and there from the solid-liquid mixture dug and stripped to a second scraper, so in a second solids receiving device to be dropped.

The The screen computing device can continue according to a particularly preferred embodiment also for transport of liquid in one of the two solids receiving means be educated. For example, for a Rechengutwäsche also Liquid needed. This liquid is fed separately in known Rechengutwaschanlagen, where also uses more valuable fresh water and thus wasted becomes.

at the particularly advantageous embodiment of the invention, the Reaming and transport device a scooping device be assigned, in addition to the cleared out Solid even liquid is being transported, and transferred to the downstream screenings aftertreatment becomes.

A however, such hydration is at a temporary storage or removal of solids without treatment generally undesirable. Therefore it is particularly preferred that the scoop device, for example arranged in the range of clearing or transport devices mug or ladle-shaped containers or The like having, in a deflection of the tools with turn and turn, leaving only in one of the conveying directions Liquid is transported.

Preferably, one of the conveying directions is the main conveying direction, in which the screen computing device runs in normal operation and solid one Subsequent screenings treatment supplies. The other conveyor is preferably a selectively in case of incidents or for maintenance purposes to be selected conveying direction, where solid is transferred to an auxiliary solids receiving device, for example, in an emergency shedding container.

• • Schweres Rechengut, wie zum Beispiel Steine, Metallteile u. s. w. lagern sich in einem Sohlbereich vor einer beispielsweise in Form eines Rechenrostes vorgesehenen Siebeinrichtung ab. Bei einem Abwärtsräumungsvorgang entlang der Siebeinrichtung werden solche schweren Rechengutteile nicht erst über die gesamte Länge der Siebeinrichtung nach oben gezogen. Dadurch besteht keine Gefahr, dass sich zum Beispiel Steine im Rechenrost verkeilen und zu Störungen führen.
• • Weiterhin hat das an der Siebeinrichtung anhaftende Rechengut einen kürzeren Transportweg im Siebbereich. Dadurch ist die Gefahr, dass bereits zurückgehaltenes Material durch die Siebeinrichtung fällt und in den Ablaufbereich gelangt, wesentlich geringer. Die Abscheideleistung ist verbessert.
• • Gerinneablagerungen werden von den unteren Lagern weggefördert und nicht wie bei einem Aufwärtsräumvorgang in Richtung dieser Lager gefördert.
• • Falls das wenigstens eine Räum- und Transportwerkzeug auch als Schöpfwerkzeug ausgeführt ist, kann eine zusätzliche Wasserversorgung für die Rechengutwäsche entfallen.

Preference is given to those in the WO 00/48705 explained reasons, the main conveying direction chosen such that the engaging in the screen surface broaches moving on movement in the main conveying direction on the screen surface down. It is also preferred that the first solids intake device, which receives the solids for further processing in the preferred embodiment in normal operation, is arranged upstream of the sieve surface. This selection of the main conveying direction and arrangement of the main solid receiving device has the following advantages:

• Heavy screenings, such as stones, metal parts, etc. are deposited in a sole area in front of a screening device provided, for example, in the form of a grating. During a down-sweeping operation along the screening device, such heavy screenings are not first pulled up over the entire length of the screening device. As a result, there is no risk that, for example, stones will become wedged in the grating and cause problems.
• In addition, the screenings adhering to the screening device have a shorter transport path in the screen area. As a result, the risk that already retained material falls through the screening device and enters the drainage area is much lower. The separation efficiency is improved.
• • Channel deposits are carried away from the lower bearings and are not conveyed towards these bearings as in an upward clearing operation.
• If the at least one clearing and transport tool is also designed as a scooping tool, an additional water supply for the screenings wash can be dispensed with.

As the "feed side", in particular, "water inlet side", the front is understood the Siebrechenvorrichtung. From this page will be a screening device, in particular a grating, flowed.

As a "drain page", in particular, "water drainage side", the back is the Siebrechenvorrichtung called. On this page leaves the purified liquid, in particular water, the sieve device.

In a "down-sweep" operation, the direction of rotation of a drive motor of the screen calculator is such that a broaching tool clears from top to bottom., In particular, begins a clearing rake above the liquid level and clears the screenings deposited on the screen towards the bottom of the gutter, see also the WO 00/48705 , However, in the present embodiment, the broaching tool is deflected and then promotes the screenings as a transport tool up to a discharge point at the inlet side. This drop point will be referred to as the "drop point feed side" below.

at an "up-sweep" is the direction of rotation the drive motor so that the broach, ie in particular a Räumharke, from bottom to top clears. The means that the broaching tool begins the broaching process for clearing the screening device on a gutter bottom and clears the screenings adhering screenings up to a second discharge point on the discharge side, which is referred to below as the "discharge point discharge side" referred to as.

As "main drop side" the side is called, where in the normal case - normal operation - dropped becomes. This may be on the inlet side or the outlet side.

Because of the above-mentioned advantages of a down-sweeping process and the subsequent transport on one of the actual Screen surface of more distant transport path area is the main discharge side prefers the inlet side.

embodiments The invention will be described below with reference to the attached Drawings explained in more detail. It shows.

1 a side view of a first embodiment of a solid-liquid separation device in a sewage treatment plant with a two-way Siebrechenvorrichtung;

2 a plan view of the Siebrechenvorrichtung of 1 seen from upstream in the downstream direction;

3 a side overview of a second embodiment of a solid-liquid separation device with Siebrechenvorrichtung in a sewage treatment plant;

4 a view of the Siebrechenvorrichtung of 3 seen from upstream in the downstream direction;

5 a prior art screen calculator; and

6 a view of the Siebrechenvorrichtung of 5 seen in the direction of the process; and

7 an illustration of a raking rake of the Siebrechenvorrichtung of 1 ,

In the 5 and 6 First, a construction of a known Siebrechenvorrichtung 10 explained, from which the invention proceeds. The screen calculating device 10 according to the 5 and 6 is as a circulating fine screen 12 constructed. The fine rake 12 has a screening device in the form of a grating 14 with sieve bars in the form of bars 16 , which have a distance of greater than or equal to 4 mm to each other. Throughput rates of up to 4000 l / sec can be achieved. The construction can be completely made of stainless steel in robust construction. The computing bars 16 are wedge-shaped and are made by wastewater 18 in a channel 20 flows through only once. It is a clearing and transport device 20 provided with the computing field of the computing grid 14 can be cleaned in about 5 sec. The clearing and transport device 22 has several clearing rakes as clearing and transport tools 24 attached to a revolving drive means, here in the form of circulating chains 26 are attached. On each side of a frame 28 the screen calculating device 10 is always a circulating chain 26 stored. The teeth of the Räumharken 24 grab the rake bars 16 of the grating 14 to move the screenings up. In the head area 30 of the circulating fine fine 12 There is a discharge chute in the area of the screenings is dropped. Due to the construction of the circulating fine rule 12 is the height of the rake over the corridor (discharge height) regardless of the depth of the channel. Thus, even with extremely deep channels 20 a trouble-free Rechengutförderung be guaranteed.

A possible distance of the rake bars is 6 mm. Smaller and larger column widths are possible. Because the grating rust 14 can be made very stable, there is no need to precede a rough rake.

The at equal intervals on the circulating chains 26 - Beech conveyor chains, for example - fixed rake 24 clean the calculation field in normal operation every 10 seconds. The cleaning intervals of the grating can be reduced to 5 seconds. Due to the quick cleaning of the grating 14 the congestion loss is reduced to a minimum. There are no significant water level fluctuations in the area of the feed 34 ,

• – Wenn ein Feststoff zwischen den Rechenstäben 16 steckenbleibt, wird dieser aufgrund der Aufweitung der Spaltweite spätestens durch den Kontakt mit einem Zahn der Räumharke 24 gelöst.
• – Der Strömungswiderstand ist sehr gering, was eine Reduzierung des Stauverlustes zur Folge hat und unerwünschte große Wasserstandsschwankungen bzw. Zulaufstöße auf ein Minimum reduziert.
• – Es sind hohe Durchflussmengen, zum Beispiel 1 m³/sec pro Quadratmeter Rechenfeld möglich.

The calculation field of the computational grid 14 consists of streamlined profiled bars 16 which individually with a frame of the grating 14 are connected. Thus, each individual rake can be exchanged separately. The screen bars have a conical profile, which is wider in the inlet than in the outlet. This results in three basic advantages:

• - If a solid between the bars 16 gets stuck, this is due to the widening of the gap width at the latest by the contact with a tooth of the Räumharke 24 solved.
• - The flow resistance is very low, which has a reduction in congestion loss result and unwanted large water level fluctuations or inflow shocks to a minimum.
• - There are high flow rates, for example 1 m ³ / sec per square meter of calculation field possible.

The following will now be based on the 1 to 4 one in a sewage treatment plant according to the invention 40 installed solid-liquid separation device according to the invention 42 with a Siebrechenvorrichtung invention 44 explained in more detail. In this case, the same reference numerals as in the previous explanation of the prior art are used for comparable sub-elements.

The bars 16 of the grating 14 This Siebrechenvorrichtung are in the lower area, at the bottom area 58 of the channel, curved upstream, so that in the sole region upstream projections 35 are formed with a curved contour.

The screen calculating device 44 is different from the one in the 5 and 6 illustrated Siebrechenvorrichtung 10 especially in that the head area 30 two drop points 46 . 48 namely, a drop point drain page 46 as well as a discharge point inlet side 48 are provided.

Like from the 1 and 3 it is also visible on each side of the frame 28 a circulating chain 26 as drive means available. At regular intervals are on these rotating chains 26 Räumharken 24 fixed so that they are driven by the circulating chains 26 along an orbit closed to an endless loop 50 in a first conveying direction 52 as well as in the opposite second conveying direction 54 are movable. In the area of the channel 20 is a trick 56 the circulating chain 26 for clearing the grating 14 close to the bars 16 guided.

In the sole area 58 of the channel 20 are the chains 26 through a deflection shaft 27 redirected, leaving a second strand 60 upstream of the first dream 56 a little further away from the grid 14 goes up. Above the upstream dream 60 is the chain 26 at 62 in the deflected upstream direction, in which case at a further deflection 64 a first stripping device 66 for dumping the solid into a first solids receiver 68 is provided. The chain 26 then continues approximately horizontally and is at one by a motor 70 driven drive shaft 72 redirected again and then forms the upstream strand 56 , In the area of the drive shaft 72 there is a second stripping device 74 with opposite effective direction as the first stripping 66 ,

The projections 35 at the bottom of the grid 35 are with their pointing in the upstream direction contour surface the course of the trajectory of the chain 26 around the deflection shaft 27 adapted around, with an upstream inlet area 36 between the projections 35 and the deflection shaft 27 something is formed extended.

The circulating chains 26 with the individual Räumharken 24 forms a clearing and transport device 76 , When turning the clearing and transport device 76 in the first conveying direction 52 the clearing rakes move 24 at the close to the Trum 56 in the direction of the sole area 58 downward. If the engine 70 in the first conveying direction 52 Thus, a down-sweep is performed. Moves the clearing and transport device 76 in contrast, in the second conveyor 54 , then the Räumharken move 24 at the close to the Trum 56 up and a down-sweep is performed.

During the down-sweep, the solids along the upstream dream 60 from the gutter 20 promoted, then at 62 redirected and over a first chute 78 in the first solids receiving device 68 discarded.

In the up-sweep, on the other hand, the solids along the downstream, near-screen Trumes 56 up from the gutter 20 promoted and at the second stripping 74 stripped off and over a second discharge chute 80 in a second solids receiving device 68 discarded.

The solid-liquid separation device 42 further shows in the example shown a screenings aftertreatment machine, here in the form of Rechengutwaschanlage 84 on. In normal operation, the Siebrechenvorrichtung 44 so operated that the solids in this Rechengutwaschanlage 84 be dropped. The Rechengutwaschanlage 84 is with a Rechengutpresse 104 Mistake.

For an emergency operation, for example in case of malfunctions in the Rechengutwaschanlage 84 or for servicing the Rechengutwaschanlage 84 , the screen calculating device becomes 44 operated in the opposite direction of conveyance to the solids in a makeshift or emergency container 86 to convict.

The two embodiments of the solid-liquid separation device 42 differ in that the positions of Rechengutwaschanlage 84 and the emergency containers are reversed. At the in 1 and 2 illustrated embodiment is the Rechengutwaschanlage 84 as the first solids receiving device 68 at the discharge point inlet 46 stationed and the emergency container 48 is as a second solids receiving device 82 at the drop point exit page 46 stationed.

Next is at the in the 1 and 2 illustrated Siebrechenvorrichtung 44 a scooping device 88 to draw liquid into the screenings washing system 84 formed by the fact that the individual Räumharken 24 like this in 7 is indicated at one when placed on the upstream strand 60 upwardly directed end region 90 with a scoop opening 92 are provided and at the opposite end 94 that moves on the downstream strand 56 is up, closed. Next is a main body 96 the Räumharken 24 each hollow inside, so that the Räumharken 24 are formed overall as a scoop container for the liquid.

The operation of the in the 1 and 2 illustrated first embodiment of the solid-liquid separation device 42 runs as follows:
Main discharge side is the water intake side 98 , In normal operation, the engine rotates 70 such that the chains 26 in the first conveying direction 52 to be moved. The Räumharken 24 move along the near-seventh dream 56 down and thus clear the grating in a downward direction. In the sole area 58 become the Räumharken 24 at the deflection shaft 27 diverted. The projections provide 35 of the bars 16 that the solids also during the deflection at the Räumharken 24 remain and that also solids at the bottom area 58 be cleared out. After the deflection promote the Räumharken 24 then along the upstream dream 60 on the one hand solids and on the other hand through the scoop opening 92 in the main body 96 entering liquid upwards. The Räumharken 24 then be in the header 30 at the diversion 62 deflected, so that in the main body 96 located liquid in the Rechengutwaschanlage 84 pours. At the same time solids in the first discharge chute 78 discarded, at the latest when they are at the first stripper 78 from the Räumharken 24 be stripped off. The Räumharken 24 then run along the Close to dreams 56 further down.

The screen calculating device 10 But it can also - also permanently and as a rule - in the other, second conveying direction 54 operate. Will the screen computing device 10 as described above, normally in the first conveying direction 52 operated, then in particular in the cases where it with the Rechengutwaschanlage 84 there is some problem or there are larger objects that have the grating rust 14 clog the engine 70 through a controller 100 diverted so that the clearing and transport facility 76 in the second conveying direction 54 emotional.

When moving in the second conveying direction, the solids and possibly the larger objects are removed from the grating by an upward scavenging operation 14 cleared and by stripping on the second stripping 74 over the second chute 80 in the second solids receiving device 82 provided emergency container 86 discarded. When clearing the tabs help 35 in such a way that thereby and by any further flow influencing elements 38 - z. B. convertible depending on the conveying direction - in the sole region also has a certain upward flow, the movement of the solids, the curvature of the projections 35 supported along. At this curvature, the solids are guided and by means of the already engaging Räumharken 24 safe from the sole area 58 promoted.

In the in the 3 and 4 illustrated second embodiment is the Rechengutwaschanlage 84 as a second solids receiving device 82 at the discharge point expiration page 76 , The emergency container 86 is the first solid receiving device 68 at the discharge point inlet side 48 , The screen calculating device 44 can remain unchanged in construction, even if here is another arrangement of Rechengutwaschanlage 84 has been made. However, here are the Räumharken 24 as normal Räumharken without Schöpffunktion with two closed end areas 90 . 94 educated. The main drop point here is the drop point exit page 46 , In normal operation, the Siebrechenvorrichtung 54 in the second conveying direction 54 operated. Only in emergency operation is a reversal in the first conveying direction 52 , The effect of the projections 35 is the same as above.

The wastewater freed from the solids 18 will then over the water drain 102 dissipated.

Otherwise, the screen computing device 44 as educated as before by the 5 and 6 described.

10

Seven computing device

12

Circulation-fine screen

14

bar rack

16

screen bars

18

sewage

20

Flume

22

broaching and transport device

24

Räumharke

26

encircling Chain (drive means)

27

(lower) return shaft

28

frame

30

head area

32

discharge chute

34

Intake

35

projections

36

intake area

38

Flow control elements

40

sewage plant

42

Solid-liquid separator

44

Siebrechenvorrichtung

46

Discharge point downstream side

48

Discharge point upstream side

50

orbit

52

first conveying direction

54

second conveying direction

56

Siebnahes or downstream strand

58

invert

60

more distant or upstream strand

62

redirection in the upstream direction

64

Further redirection

66

first stripping

68

first Solid recording device

70

engine

72

drive shaft

74

second stripping

76

broaching and transport device

78

first discharge chute

80

second discharge chute

82

second Solid recording device

84

Rechengutwaschanlage

86

Notcontainer

88

scoop

90

end

92

scoop opening

94

end

96

main body

98

Water supply side

100

control

102

Water outlet side

104

screenings

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• WO 00/48705 A [0001]
• - WO 93/01000 [0002]
• DE 10057269 A1 [0002]
• DE 102004038842 B4 [0002]
• WO 00/48705 [0003, 0025, 0033, 0036]

Claims (29)

Screening device ( 44 ) for removing solids from a solid-liquid mixture ( 18 ), with a screening device ( 14 ) for screening out solids and a relative to the screening device ( 14 ) movable clearing and transport device ( 76 ) for removing solids from the screening device ( 14 ) and for transport into a solids receiving device ( 68 . 82 ), characterized by a lower portion of the screening device ( 14 ) is formed protruding in an upstream direction. Screen calculating device according to claim 1, characterized the lower portion of the screening device in the stromäufwärtige Direction is curved. Screen calculating device according to one of the preceding claims, characterized in that the clearing and transport device ( 76 ) is deflected in the region of the solid-liquid mixture and that the screening device ( 14 ) is formed at least partially following the deflection. Screen calculating device according to one of the preceding claims, characterized in that the clearing and transport device ( 76 ) upstream of the screening device ( 14 ) and in the vicinity of a bottom of the solid-liquid mixture receiving container or channel ( 20 ) passes through a trajectory curved downward and upstream of the screening device. Screen calculating device according to one of the preceding Claims, characterized in that the lower protruding Area of the screening device in the area of the diversion of the clearing and transport device upstream and / or downstream towards the top of the clearing and transport device approximate is trained. Screen calculating device according to one of the preceding Claims, characterized in that the clearances and transport means about a substantially transversely to the flow direction extending central axis around circular arc out is, and the lower portion of the screening device at least partially also curved in a circular arc around the central axis is. Screen calculating device according to one of the preceding Claims, characterized in that the clearances and transporting device around a rotatable lower deflection shaft is stored guided. Screen calculating device according to one of the preceding claims, characterized in that the screening device ( 14 ) a screen surface extending at least with a directional component in a vertical direction with upwardly extending rods (US Pat. 16 ) having. Screening device according to claim 8, characterized in that the lower end region of the rods ( 16 ) are formed upstream protruding and / or at the lower ends of the rods ( 16 ) are formed stromeaufwärtige projections. Screening device according to claim 8 or 9, characterized in that the clearing and transport device ( 76 ) at least one in spaces between the bars ( 16 ) engaging clearing and transport tool ( 24 ) having. Screening device according to one of the preceding claims, characterized in that the clearing and transport device ( 76 ) for delivering the solid to at least two different solids receiving devices ( 68 . 82 ) is trained. Screen calculating device according to claim 11, characterized in that the clearing and transport device ( 76 ) at least in a first conveying direction ( 52 ) and in a second conveying direction ( 54 ) is movable and is designed such that it solid when moving in the first conveying direction ( 52 ) to a first solids receiving device ( 68 ) and when moving in the second conveying direction ( 54 ) to a second solids receiving device ( 82 ). Screen-calculating device according to claim 12, characterized in that the clearing and transport device ( 76 ) in both directions ( 52 . 54 ) can continuously circulate several times to continuously clear the screening device ( 14 ) and solids removed for continuous transport into the associated solid receiving device ( 68 . 82 ). Screen-calculating device according to claim 13, characterized in that the clearing and transport device ( 76 ) a drive means closed to an endless loop ( 26 ), by means of which at least one clearing and transport tool ( 24 ) for a multiple circulation in an orbit ( 50 ) in the first and the opposite second conveying direction ( 52 . 54 ) is movable. Screen calculating device according to one of the preceding claims, characterized in that the screening device ( 14 ) a screen surface extending at least with a directional component in a vertical direction with upwardly extending rods (US Pat. 16 ) and the Räum- and Transport device ( 76 ) at least one engaging in intermediate spaces between the rods clearing and transport tool ( 24 ) located on the screen surface during movement of the clearing and transport device ( 76 ) in a first direction ( 52 ) in a downward direction and during movement of the clearing and transport device ( 76 ) in a second conveying direction ( 54 ) is moved in an upward direction. Screen calculating device according to one of the preceding claims, characterized in that at the lower end region projecting upstream ( 58 ) of the screening device ( 14 ) a trajectory ( 50 ) of the at least one clearing and transport tool ( 24 ) is deflected from a downward direction in an upward direction or vice versa. Screen calculating device according to one of the preceding claims, characterized in that at least one clearing and transporting tool ( 24 ) of the clearing and transport device ( 76 ) is formed such that it is solid both when moving up on a near the screen device ( 14 ) for clearing the same running section ( 56 ) of its trajectory ( 50 ) as well as moving up on one of the screening device ( 14 ) more distant portion ( 60 ) of its trajectory ( 50 ) from the solid-liquid mixture ( 18 ) can lift. Screen-calculating device according to one of the preceding claims, characterized by a first stripping device ( 66 ), which move during movement of the clearing and transport device ( 76 ) in a first direction of movement ( 52 ) Solids for discharge into a first solids receiving device ( 68 ), and / or a second stripping device ( 74 ), which move during movement of the clearing and transport device ( 76 ) in a second direction of movement ( 54 ) Solids for discharge into a second solids receiving device ( 82 ) strips off. Screen calculating device according to one of the preceding claims, characterized in that the clearing and transport device ( 76 ) also for transporting liquid, in particular into a first solids receiving device ( 68 ), is trained. Screen-calculating device according to claim 19, characterized in that the clearing and transport device ( 76 ) a scooping device ( 88 ), which upon movement of the clearing and transport device ( 76 ) in the first conveying direction ( 52 ) Liquid from the solid-liquid mixture ( 18 ), but when moving in the second conveying direction ( 54 ) can not transport a substantial amount of liquid. Screen calculating device according to one of the preceding claims, characterized in that the first solids receiving device ( 68 ) is arranged on a solid-liquid mixture feed side of the sieve device and the second solids receiving device ( 82 ) is arranged on a liquid discharge side of the screening device. Solid-liquid separation device ( 42 ) with a screen computing device ( 44 ) according to one of the preceding claims and with a screenings treatment device ( 84 ) for reducing the volume of solids, preferably as a first solids receiving device ( 68 ). Solid-liquid separation device ( 42 ) according to claim 22, characterized in that the Rechengutbehandlungsvorrichtung a Rechengutwaschanlage ( 84 ) to wash out organic matter from the solid. Solid-liquid separation device according to one of the preceding claims, characterized in that the screenings treatment device a Rechengutpresse ( 104 ) having. Solid-liquid separation device according to one of the preceding claims, characterized in that a further solids receiving device ( 68 . 82 ), preferably the second solids receiving device ( 82 ), a solids container ( 86 ) for temporary storage or for the removal of solids. Sewage treatment plant ( 40 ) for wastewater treatment with a sewage channel ( 20 ) into which a screen computing device ( 44 ) is used according to one of claims 1 to 21, and / or with a solid-liquid separation device ( 42 ) according to any one of claims 22 to 25. Process for the separation of solids from a solid-liquid mixture ( 18 ) comprising the steps of: sifting out solids from the solid-liquid mixture ( 18 ) by means of a screening device ( 14 ) and optionally • removal and removal of solids from the screening device ( 14 ) into a first solids receiving device ( 68 ) by operation of a clearing and transport device ( 76 ) in a first conveying direction ( 52 ) or • removal and removal of solids from the screening device ( 14 ) into a second solids receiving device ( 80 ) by operation of the clearing and transport device ( 76 ) in a second conveying direction ( 54 ). A method according to claim 27, characterized by transport of the solids in the first solid substance receiving device ( 68 ) for further treatment of the in the first solids receiving device ( 68 ) transported solids with regard to reduction of the liquid content and / or the volume or weight and / or the content of organic constituents as normal operation and transport of the solids into the second solids receiving devices ( 82 ) in incidents. Contraption ( 40 . 42 . 44 ) for carrying out the method according to one of the preceding method claims characterized by a device ( 40 . 42 . 44 ) according to one of the preceding device claims with at least one corresponding motor drive ( 70 ) and a control device ( 100 ) set up to control the automatic operation of the method.