DE2506173A1 - FILTER PRESS, IN PARTICULAR FOR DEWATERING OF SLUDGE IN SEWAGE TREATMENT PLANTS, PREFERABLY BELT FILTER PRESS - Google Patents

Description

0-8023 Mönchen-Pullach. Viennese sir. 2; Tel (089) 793 30 71; Telex 5212147 bro »d; Cables: -P «tentibus- Munich

you z * ct * n ülj, ^r *> - lM. February 1975

Your «f .: D« »: .1 / mü.

Albert Bahr, 6683 Elversberg / Saar, Parallelstrasse 2a

Filter press, especially for dewatering Sludge in sewage treatment plants, preferably sieve

belt press

It is known to occur in sewage treatment plants Sludge after the addition of organic and / or inorganic filter aids for flocculation on a so-called To dewater the belt filter press, in which it is first placed on a horizontally arranged belt section without pressure and then subsequently dewatered in a further belt section using pressure. Here it is also already known, the screen belt in the printing line to To lead drums of various training courses.

In order to relieve the work of the sieve belt, it is also known to have a pre-drainage in such presses, either in the form of settling tanks in which the flocculated sludge is brought to the bottom and only then below Decanting of the released water was given on the belt press or pre-drained with the help of a sieve drum.

609835/0485

'The disadvantage of these known filter press systems was that the | . Pre-drainage insufficient and elastic to the work of the j; Belt press was adapted. The invention has the task of j

i I

: ordered to avoid these disadvantages and a belt press:

^; design se or the like with pre-drainage, j

! which is particularly effective in its drainage work!

There [on the other hand the possibility that each required '

j lent pre-dewatering of the sludge to be dewatered with regard to j

I its special nature or the content of j

^! Adjust dry matter. !

I i

To solve this problem, the invention is based on a filter!

i press plant, in particular for dewatering sludge in waste j ^: water treatment plants, preferably with a filter belt in front of; orderly facility for pre-dewatering the sludge before his- ■; nem entry into the belt filter press and consists essentially; , in it, the main belt one with circumferential filter pockets for. _; ! the inclusion of the sludge-equipped drainage device j ι ί

; provision to be made.

ί The dewatering device, the invention may according to the invention, be formed as beispiels- j cell drum are arranged tert ash in the cells of FII [, however, for higher outputs and drainage effects, it is preferable, in the

j way to design that the drainage device as Bandj pocket filter is formed.

In both embodiments of the invention, in the pockets of the circumferential filter achieves very good pre-drainage and it is also the drainage performance by regulating the To vary the speed of the circulating pocket filter J.

For example, if a certain degree of dryness or solid content is to be achieved in the final sludge, which can only be achieved at a limited maximum speed of the belt filter press

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25Ö6373

¹ , you can reduce the pre-drainage by changing the delivery rate

j speed of the pocket filter according to the invention is also reduced change and adapt to the speed of the belt filter press.

. In all cases it is advantageous to use the Vorentwässerungs-einrjeh-j

. tion above a horizontal belt line of the belt press j

j, with drum presses this horizontal belt j

! stretch either above the drum or next to the drum

, for example at the level of the level of the lower vertex

S of the drum, can be arranged.

. The advantages characteristic of the invention can also be L

can also be used, for example, in chamber filter presses, in that, according to the invention, the particular type of pre-drainage device on which it is based is connected upstream of a chamber filter press ; will. "" ■ ': "■ j

: Furthermore, there is a proposal of the invention is that their ι. direction i

ι underlying V. pre-drainage infiltration / on drying beds of sewage |

! to use sewage treatment plants in such a way that the sewage sludge before j the task on the drying bed first with a flocculant offset, and then after flocculation first on the pre-drainage device is abandoned according to the invention, too a substantial part is dehydrated, only then to the Dry bed to be abandoned. This enables the bed areas of such dry bed systems to a fraction of the hitherto usual.

Further advantageous details of the invention are from Drawing can be seen, in which the invention is explained, for example.

: It shows: ■.

1 shows a Siebbaridpres-i designed as a drum filter se according to the invention in longitudinal section and

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Pig. 2 another embodiment of such a! Drum filter press. j

In the drawing, 1 is a sludge! The metering pump, through which the raw Schlamti to be treated first a conical mixing container 2 is given, in wel-l chem an agitator 3 is driven by a hollow shaft 4. A j Flocculant is fed through the hollow shaft 4 into the mixing container 2j

abandoned for mixing with the raw sludge and passes through nozzles 5 at the end of three arms of the hollow shaft 4 into the mixing container 2. The sludge mixed with the flocculant rises in the mixing container 2 and enters a reaction space 6, which in the illustrated embodiment is j above the mixing container, but also at another point! can be provided. The flocculated sludge mixed with the flocculant arrives in the example according to FIG. 1 via a shaft 51 with a horizontal section 52 into a pre-dewatering device, which in FIG. 1 is designed as a cell drum 53 and further below will describe. Signed outer filter belt a belt filter _press: from the cell \ of the pre-dewatered sludge is passed to a drum 53 with loading. 9 The filter ■ band 9 is first passed horizontally over the rollers 29, where \ a vibration device can be arranged, which sets the filter band i 9 in controlled vibrations. This vibration? device has any well-known training _;

manure. j

. - ι

At the end of the horizontal path, the filter belt 9 is over the left roller 29 is guided down and forms one from here

ι I

! wedge-shaped intake space which is delimited at the bottom by a second filter belt 10. Both filter belts 9 and 10 therefore now take up the sludge applied to the filter belt 9 between them. On the horizontal pressure section that now follows, the filter belts 9 and 10 are supported from below by support rollers 33 ^l and pressed together from above by pressure rollers 34, J

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so that the water or the other liquid is pressed out of the sludge by pressure by the filter belts 9 _} 10 on this horizontal pressure section.

The outer filter belt 9 and the inner filter belt 10 exist made of fine-mesh wire mesh and are each supported by an outer support band 11 and an inner support band 12. The support bands As already mentioned, 11 and 12 are designed in such a way that they are suitable for absorbing the highest compressive stress. she can for example consist of longitudinal chain wires which are woven into cross bars made of steel.

With 21 is a Sapnnvorrichtung for the support bands 11 and 12 and with 22 a jig for the filter belts 9 and 10 be distinguished.

The filter belts are connected to the horizontal printing section 9 and 10 and the support belts 11 and 12 guided over a rotatable drum, which in the illustrated embodiment is designed as a rotatable roller cage 13 and over the drive shaft 17 can be set in rotation by the drive motor 18. The pressure rollers 14 of the roller cage 13 are each through adjustable compression springs. The direction of rotation of the roller cage 13 and the shaft 17 can also be reversed, so that the film cage 13 runs concurrently with the belts 9 can be rotated up to 12 or in the opposite direction to these bands.

Of the belts, only the support belts 11 and 12 are preferably driven by the drive motors 19 and the drive currents 20 driven and take the outer filter belt and the inner filter belt with them when they move, which is not particularly the latter are driven.

The pressure that is applied to bands 9 to 12 on the pressure

609835 / 048.5

serungsstrecker / is exercised by the setting of the Springs regulated. In all cases it is advisable to use the compression springs Set harder and harder in the course of the pressing path of the sludge, so that the dewatering pressure is increased. Further the roller cage 13 of the drums is expediently asynchronous to the Speed of the support belts 11 and 12 or the outer and inner filter belt 9 and 10 driven so that the outer stationary pressure rollers 14 when the roller cage 13 rotates penetrate into the gaps between the individual rollers and so the mud and the belts have to perform a wave movement, by tearing open and intensive fulling of the to be squeezed out Mud is reached.

The ones from the mud all the way through the press The liquid discharged is in each case under the belts or within the roller cage 13 through water catchment and discharge plates 25 caught and for the invention it is characteristic, among other things, that with her a very good possibility for the collection and the discharge of this liquid is given, and in particular it is also avoided that liquid that has already been removed is returned can get into the sludge, as was the case with known filter presses of a similar type. The expelled liquid leaves the press through the outlet 31, while the pressed sludge is thrown off at 32.

With 26 each filter belt washing nozzles are designated by the the filter belts 9 and 10 are washed out before they are reloaded with sludge.

As can be seen from the drawing, the filter belts 9 and 10 run around the roller cage 13 in the last quarter of the flexing section increasing. This ensures that the squeezed-out liquid can also run off downwards on this section.

53

The. Cell drum shown in Figure 1 / is on its shaft

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54 driven counterclockwise * The shaft 54 is from a. Surrounding hollow shaft 55 on which the cell walls 56 are placed. In the cells between the cell walls 56 are "Sieb.tasch.en. 57", which form a wedge-shaped cross section and consist of sieves or sieve belts larger screen perforation than the "," of the filter belts 9 and 10 and also axially through the same on their side walls Sieve material can be limited. The sieves are designated in the drawing with 58. .---] _-

The effective axial length of the screen drum corresponds to the width the filter belts 9 and 10 and the sieve drum is driven by a separate motor / adjustable speed, you is arranged in a closed housing 49 throughout and covered on its right side by a jacket 60, which can also be designed as a sieve jacket.

The flocculated sludge rises from the settling tank 6 of the Flokkul at ion device through the shaft 51 and arrives; about the horizontal piece 52 of the shaft over its pouring opening, which corresponds approximately to the width of the cell drum 53, in each case in the sieve pocket above and the water it contains is largely withdrawn from the sludge and passes through the sieves 58 in the cavity between shaft 54 and hollow shaft 55 to laterally. to be withdrawn in the axial direction. The individual sieve pockets are separated from one another by the cell walls 56, so that the Water leaking from one lake does not get into the neighboring one Siebtasche can get. The drainage process continues the rotation of the sieve drum in a clockwise direction until the into the individual sieve bags containing sludge near the lower one Vertex of the sieve drum placed on the filter belt 9 =: will and then continue in the usual way in the sieve belt.

press is drained. '"- ·:

If greater filter performance or greater degrees of drying in the ■ Final sludge are required, the 'execution form is recommended

609835/0485. : "

of the invention according to Figure 2, in which the drainage device; device is designed as a sieve bag filter.

In this belt pocket filter there is a revolving conveyor belt 61 with: Sieve pockets 62 in the manner of sieve pockets 57 with walls made of sieve material 63 and is guided or driven around cell wheels 64 at both ends. The drive motor is at 65

designated.

As in the exemplary embodiment according to FIG. 1, the flocculated sludge rises from the settling tank 6 in a shaft 51
at the top and there it is fed via a horizontal section 52 of the shaft via its pouring opening 66 into the individual pockets of the belt pocket filter and drained there, the upper run of the belt moving from left to right. That from the; Water escaping from individual filter pockets is caught by the catch plate 67 and discharged to the side. The dewatered sludge is discharged onto the filter belt 9 at the lower apex of the right drive wheel j 64. ;

The left bypass drum of the belt pocket filter does not need to be designed as a cell drum like the right drum, but can be of the type of a cage whose rods | be when passing the belt between the individual filter bags; see intervene. With 68 is in the area of the left bypass flow | Mel indicated a spray device for washing out the sieve walls of the filter bags. Like the bucket wheel in Figure 1 is also
the belt bag filter according to FIG. 2 is expediently surrounded by a closed housing 69.

Also the screen walls of the filter bags in the belt bag filter
are equipped with larger screen perforations than corresponds to the mesh size of the filter belts -9 and 10. The conveying speed of the belt bag filter according to FIG
previously explained sense can be arbitrarily regulated to a

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I to achieve adaptation to the respective circumstances.

If one assumes, for example, that a sludge with a content of k% dry matter is to be processed at a throughput of 10 cbm per hour, then in the pressureless pocket dewatering the feed quantity is 10 cbm per hour with 4? Dry- ! sutxstanz. In the pocket drainage, drainage down to about 15 pounds of dry matter content can be achieved and 7 * 35 ebiu I water can be given off. At the drop point of the pocket drainage j and thus at the drop point of the sieve belt drainage, the I amount of sludge is only 2.65 cbm per hour with 15? TS Dem-

\ According to the belt filter press can, within certain limits selectable ^ I slower speed than the Taschenentwässerungseinrich-! tung be operated to the exposure time of pressure on the pre-dewatered sludge and the dewatering time dimensioned according to ■ depending on what a final content of dry substance is to be achieved. Tests have shown that, depending on the species. of the sludge, 30 to k0% dry matter can be achieved in the final sludge.

All shown in the drawing and in the description j The technical details explained are of importance for the invention.

609835/0485

Claims (7)

250617? Claims ^: (1.) Filter press, in particular for dewatering sludge in sewage treatment plants, preferably with a device arranged in front of a belt filter press for pre-draining the sludge before it enters the belt, characterized in that the belt is provided with a filter pocket (57) running around the filter pocket (57) for receiving the sludge equipped dewatering device is connected upstream j. 2. Device according to claim 1, characterized in that the dewatering device is designed as a cell drum (53), in the cells of which filter pockets (57) are arranged. J 3. Apparatus according to claim 1, characterized in that the dewatering device is designed as a belt pocket filter (61,62)] is. 4. Apparatus according to claim 1, 2 or 3, characterized in that the Voreritwässerungsvorriehtung above a horizontal Infeed section of the sieve belt (9) is arranged. 5. Apparatus according to claim 1,2,3 or 4, characterized ^ that the pre-drainage device (53 »6l) with different Ge j speeds can be driven. 6. Application of the pre-dewatering device according to claim 1 to and 5 for the pre-dewatering of sludge before the task in the Chamber filter presses. 7. Application of the pre-drainage device according to claims 1 to 3 and 5 to the pre-dewatering of flocculant added Sewage sludge before being fed onto drying beds. 9835/0485 Blank page