FI96488B - Arrangement for filtering liquid material - Google Patents

Description

96488

Apparatus for filtering a liquid substance

The invention relates to a device for filtering a liquid substance, for example for the treatment of waste water, which device comprises a tank space, a filter means arranged in the tank space, supply means for feeding liquid substance into the tank space, outlet means for .

The present invention utilizes rock wool as the filter means. The present invention relates to devices such as those mentioned above, in particular to wastewater treatment devices, in which the surface of the filter means 15, in this case rock wool boards, used in the devices is regenerated. By regeneration is meant machining the surface of the filter means, for example by brushing, so that the most dirty part of the solids contained in the liquid 20 to be filtered is removed from the top of the filter means such as rock wool.

In known devices, as well as in the present device, the operating principle is one in which the liquid to be cleaned is lowered onto the filter medium placed in the tank into a layer of suitable strength, after which the liquid is allowed to flow slowly through the filter means. Solids and other ingredients in the liquid remain in the filter and a much cleaner liquid is obtained from the device.

In previously known solutions, the regeneration of the filter means is performed, for example, with water jets, whereby a strong water jet removes the surface layer of the filter means and exposes a new, still unobstructed surface from the filter means. Another known way is to use 35 manual brushing or scraping, whereby a user of the device 2 96488, for example a fish farm maintenance man or another user, uses a hand-operated brush to clean the surface of the filter means.

There are several disadvantages to these solutions.

5 In both ways, there is a human factor that affects the regeneration result. The surface treatment of the filter means may be uneven, which means that in some places the filter may still have a clogged dirty surface. Human procedures also require good lighting conditions in order to even have the conditions for a good regeneration result. It is also clear that manual methods are expensive in terms of labor costs and difficult for an employee to perform. Assessing the wear of the filter media can prove difficult when operating the ver-15 wheel only manually.

The object of the present invention is to provide a new type of device for filtering, for example, a liquid substance, such as waste water, which avoids the problems associated with known solutions.

This object is achieved by a device according to the invention, characterized in that the device further comprises an upwardly inclined surface formed at the end of the container space, an intermediate space after the oblique surface, and at least partially adapted transfer means for removing material removed from the device.

The device according to the invention achieves several advantages. The device is easy to use, easy to automate and reliable. With the device according to the invention, the material removed from the filter means, such as a rock wool board, is immediately removed from the top of the filter. The device enables efficient regeneration, so the cleaning efficiency of the device is improved and the capacity of the device remains high. The device requires almost no manual work. The speed of movement of the Rege-35 nerts is the same at all times and

According to the device according to the invention, the regeneration is uniform throughout the regenerated area of the filter, in which case no more clogged areas can be formed in the filter, such as rock wool boards. The device according to the invention can be used to efficiently treat, for example, wastewater generated in fish farms or in agriculture. In this connection, it is emphasized that the device according to the invention can be applied to many other applications than the wastewater treatment described as an example in this application.

The invention will now be described in more detail with reference to the accompanying drawings, in which Figure 1 shows the device in plan view, Figure 2 shows the device in side view, Figure 3 shows the device in end view, Figure 4 shows carriage structure in lower position, Figure 5 shows carriage structure in upper position 6 shows a control diagram of the device.

Referring to Figures 1-3, the device comprises a tank space 1 comprising an upper tank part 1a and a lower tank part Ib, filter means 2 arranged in the tank space, supply means 3 for supplying liquid substance to the tank space, discharge means 4 for removing liquid passing through the filter. In addition, the container space 1 comprises an end le, and sides Id and le. In the figures, the supply means 3 consist of a tube arranged on the tank space 1. The pipes 3, i.e. the supply means, are provided with holes 30 through which a liquid 5, such as sewage or sludge, can be discharged into the upper tank part on the filter means 2, now on the rock wool boards, in a thin layer. It can also be seen from Figures 1-3 that the device comprises a mesh structure 6, such as a steel mesh, on which the filter means 2 35, i.e. the rock wool filter, is placed in several plates. In Figures 96488 4, the device 1 and 2 are shown in partial section for a more illustrative view of overlapping structures. Figures 1 and 2 is shown in line 300, such as a pipe or hose, in which a connector is attached to the actual feed-supply means 5 to be cleaned 3. The liquid supply line 300 feeding tube 3 takes place in the direction of arrow E direction.

The device also comprises means for regenerating the surface layer of the filter means 2 by mechanically treating the surface layer of the filter means 2. The regeneration means 10 consist of an elongate substantially round brush 9 provided with a shaft 8 in connection with the electric rotating motor 7. A chain 10 is arranged between the rotating motor and the gear of the shaft 8 to transmit the rotating force of the brush 9.

The regeneration means, i.e. the brush 9 rotating about its axis with its motors 7, are arranged in the carriage structure li above the tank space 1. The carriage structure 11 at least in part comprises means 12 for moving the carriage structure 11 relative to the tank space 1, and these means 20 consist of an electric transmission motor 12a, a shaft 12b and a gear 12c and 12d arranged in the carriage structure 11. In addition to the means arranged in the carriage structure, the means for moving the carriage structure 11 relative to the container space comprise racks 12e and 12f attached to the side beams, i.e. the frame beams 13 and 14, comprising the device. In Figures 1 and 2, the carriage structure 11 is located in its initial position at the initial end of the tank 1.

The direction of travel of the carriage structure 11 is indicated by the arrow A, in the direction of which towards the end le of the container 1 the carriage 30 advances as it brushes the surface of the filter means 2, i.e. the lying lining-wool filter 2. The recumbent rock wool filter 2 is characterized in that the rock wool boards are substantially horizontal and so that the rock wool boards do not move but are in place. In this connection, it is pointed out 35 that the brushing or regeneration is carried out only after the liquid has settled through the rock wool filter 2, whereby solids and other impurities in the liquid to be filtered have remained in the surface layer of the rock wool 2. The regeneration is thus carried out on rock wool 2, 5 on which there is no more liquid 5.

The regeneration means 9, i.e. the brush, is axially mounted on the carriage structure 11 so that the axis of rotation 8 of the brush is substantially perpendicular to the direction of movement A of the carriage structure 11. The direction of rotation of the brush 9, i.e. the regeneration means 10, is chosen so that the rotational movement of the brush 9 takes place at its lower point forward, i.e. in the direction of brush travel, whereby the rotation of the brush as the carriage structure resists movement and the brushing is thus efficient.

It can be seen from Figures 1-5 that the device comprises two slide rails 15 and 16 arranged so that the slide rails 15 and 16 are located on opposite sides of the device, the carriage structure 11 being adapted to move along the slide rails 15 and 16. dependent. The readings 17 and 18 of the carriage structure li 1 can be, for example, ordinary bearings. In this preferred embodiment, the slide rails 15 and 16 are formed parallel to the sides of the tank space 1 and the slide rails 15 and 16 are arranged substantially horizontally in the vicinity of the frame beams 13 and 14, whereby the frame structure of the device can be used to facilitate movement of the carriage structure 11.

The movement of the carriage structure 11 relative to the tank space 1 results from the rotational movement of the transfer engine 12a, thus the transfer engine pulls itself and at the same time the entire carriage structure 30 along racks 12e and 12f on the carcasses 13 and 14. 16.

In a preferred embodiment, the carriage structure 11 comprises means 19 for adjusting the height position of the regeneration means relative to the filter means 2. The means used for adjusting the height of the brush or regeneration means is most preferably a spindle motor 19 with which a very precise adjustment can be realized. In a preferred embodiment, the regeneration means 9 is fixed to the carriage structure 11 in a tilting manner, in which case the regeneration means 9 is connected to the fastening arms 20 and 21, and the fastening arms are axially mounted to the carriage structure 11 by a shaft 22. The carriage structure also comprises a frame part 23. and 9 with the mounting arms 20 and 21, the shafts 8 and the motor holes 7 from the position according to Fig. 4 can be tilted upwards to the position according to Fig. 5 around the axis 22 of the carriage structure with the body part 23 in place. The carriage structure 11 also comprises a transverse beam 100 in which the brush 9 15 is attached and the spindle motor 19 comprises a vertically movable spindle 19a which raises and lowers the brush 9 via the transverse beam 100 and with the mounting arms 20 and 21 rotating slightly counterclockwise around the shaft 22. This embodiment is structurally a simple 20-fold way to implement the height adjustment of the brush 9. The presence of the axelation 22 also ensures that when the carriage travels to the other end of the container, the brush 9 does not rigidly collide with the end le, but the brush 9 rises upwards on the shaft 22 on its fastening arms.

The device also comprises a non-contact sensor means 24 for measuring the level of the liquid surface of the container 1a, most preferably an ultrasonic sensor or an optical sensor. According to the diagram 6 and with reference to Figures 1-3, the sensor means 24 is connected to control the supply of liquid to the tank space 1a and / or to control the movement of the carriage structure 11 provided with regeneration means, i.e. a brush 9. With the signal received from the sensor means 24 at the start of the movement of the carriage 11 exceeding the upper limit set for the sensor means, the liquid supply entering the tank space ib is cut off by means of an electrically controlled valve 35 25. The liquid level is then allowed to fall so

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7 96488 until the liquid 5 has passed the rock wool filter and thus passed through the lower tank Ib, i.e. the chamber, to the outlet pipe 4. When the liquid level has dropped, the sensor means 24 detects a situation, i.e. a signal from the sensor line 24 below the lower limit set on the sensor means 24, after which the control logic comprised by the device, i.e. the control unit 260 in diagram 6 gives a brushing command, whereby the rotation motor 7 of the brush 9 starts, the brush is lowered slightly by the spindle motor 19 compared to the brush height 10 of the previous brush. The height of the previous brushing is stored, for example, in the control unit 260, which controls the spindle motor 19. Finally, the control command controls the operation of the transfer motor 12a, whereby the carriage structure 11 starts to move. The valve 25 of Figure 15 is located, for example, on line 300 in Figures 1 and 2.

It has already been briefly stated above that the brush 9 is lowered slightly. This thus means that the sensor surface 24 measuring the liquid level is connected directly 20 or indirectly to control the means for adjusting the height position of the regeneration means, i.e. the brush 9, i.e. the spindle motor 19. According to the applicant, the brush position must be lowered every second run. would be sufficient.

The lower limit and the upper limit of the sensor means 24 are adapted to be adjustable, whereby the amount of liquid 5 entering one filtration batch can be controlled and, in addition, how dry or wet brushing can be controlled.

In the preferred embodiment, the sensor means 24 can be calibrated between runs of the carriage structure 11, in which case the wear of the soft rock wool filter 2 can be taken into account. Wear of the filter 2 results in a reduction in the surface area of the filter, and as a result more water would enter the tank than would be desired. The above-mentioned problem can be eliminated specifically with non-contact sensor means and calibration. According to Scheme 6, the calibration can be performed via a control line 26, which can be connected to control logic 260, for example.

The calibration after the run ensures that the sensor means 24 measures when the desired amount of water has entered the tank without the wear of the rock wool filter 2 causing an error factor. In Fig. 6, the measurement message of the sensor 24 measuring the surface height is brought through the line 400 to the control unit 260. The upper measurement limit of the sensor means 24 is set via the line 401 and the lower measurement limit is set via the line 402. Based on the information received from the sensor means 24, the control unit 260 controls the operation of the valve 25 via the control line 403. In practice, however, the solution may be one in which the comparator 700 compares the signal measured from the line 400 with the upper limit information and the lower limit information, which may have been input to the control unit 260, for example by means of a keyboard. The control unit 260 controls the operation of the motors 19, 7, 12a and 33a. In particular, according to Figures 1, 2, 4 and 5, the carriage structure 11 comprises a regeneration means 9 in the direction of movement, i.e. a buffer member 28 arranged in front of the brush, preferably spring-weighted by a spring member 27. The purpose of the buffer member 28. the largest and most easily detachable impurities in the upper surface area of the filter are pushed away from the front, so that the brush 9 alone does not have to remove all the impurities. Due to the spring weighting, the buffer member 28 presses well against the surface of the filter means 2.

In particular, it can be seen from Figures 4 and 5 that the carriage structure 11 and / or the buffer member 28 comprising the carriage structure 11 most preferably comprise mechanical forced control means 29 and / or 30 or other means for raising the regeneration means 9 and / or the buffer member 28 as the carriage structure 11 approaches the container space. In Fig. 5, the brush 9 var-35 with the sine 20 and 21 is provided by the mechanical forced control means 29 l ·! »Ml» MH 1UH. 9 96488 is raised upwards to avoid a collision with the end le and correspondingly the pusher member 28 is raised upwards by the mechanical forced control means 30 to avoid a collision with the end le. It can be seen from the figures that the device 5 further comprises an upwardly inclined surface 31 formed in the end of the container space 1 in the direction of movement, an intermediate space 32 after the oblique surface, and a transfer means 33 at least partially arranged in the space 32, most preferably a screw removed from the rock wool filter 2 and the impurity introduced into the intermediate space 32 can be moved to the side. The transfer means or screw 33 is best seen in Figures 1 and 2. The transfer means or screw conveyor 33 comprises a motor 33a which rotates the screw and further an outlet 33b from which the material 15 transferred to the top of the screw can be removed for disposal or utilization on a car platform, belt conveyor. In the figures, at the end of the tank space, the device also comprises guide members 34 and 35, which consist of vertically strong steel plates. The purpose of the obliquely upwardly directed guide members 34 and 35 is to guide the carriage structure 11 and the buffer member 28 upwards by means of mechanical forced guide means 29 and 30. Both sides of the device have similar forced control means 29 and 30. The forced control lift takes place so that the forced control means 25 30 of the pusher member 28 and the corresponding part on the other side of the device first strikes the guide members 34 and 35, the pusher member 28 rotating counterclockwise and to avoid a collision. Figures 4 and 5 do not show an axis around which the buffer member 28 rotates, but this axis would be located in the figure at approximately the same point as the forced control means 29 of the brush 9.

A little later, the forced control means 29 of the brush 9 of the carriage structure 11, and the corresponding part on the other side of the device, strikes the guide members 34 and 35, whereby the brush member 9 rotates counterclockwise up the shaft 20 and 21 and avoids collision with the container end. Referring to Figure 6 96488 10, in a preferred embodiment, the device, most preferably the control unit, i.e. control logic 260 comprises a clock member 600, after which time the brush 9 can be rotated upwards as the carriage structure 11 begins to approach the container end 11c. The clock member 600 is connected to control a spindle motor 19 for raising and lowering the brush. In this case, the mechanical forced control would act as a backup system for the clock-controlled spindle motor 19.

The direction of rotation of the transfer motor 12a transferring the carriage structure 11 can be reversed by a limit switch 500 located at the end le. The brush raising and lowering spindle motor 19, 19a is connected to hold the brush 9 up during the carriage return movement.

The operation of the device is intermittent, which means that the desired amount of liquid 5 is poured on the exposed lying rock wool filter 2, which is allowed to settle through the filter 2 and out of the device 20 through the lower chamber Ib and the pipe 4, then the carriage 11 and the buffer member 28 and with the rotating brush 9 the surface layer of the rock wool filter 2 is regenerated by driving the carriage structure 11 from the beginning of the tank to the tank end le, the brush 9 brushing the blocked surface of the surface layer from the filter 2. The detached material is driven the screw conveyor 33 moves the removed material to the upper end of the screw 33 and out of the device. Then, under the control of the control unit 260, the carriage groove-30 structure 11 returns to its initial position, i.e. to the beginning of the tank 1, to wait for the next batch of liquid to be cleaned to be fed to the device.

In particular, it can be seen from Figures 2 and 3 that in a preferred embodiment the space Ib below the carriage structure 11 and the filter means 2 comprises a vacuum space, 11 96486 whereby the flow of liquid 5 through the filter liner 2 to the lower chamber space ib 36 through. The formation of a vacuum is intermittent. A vacuum is created when there is liquid on or already inside the filter 2. When a vacuum is established, the discharge line 4 is closed.

The supply means 3 shown in the figures, i.e. the pipe 3 above the tank, is not the only way to implement the supply of the liquid 10 to be cleaned in the tank space.

Ib. In a preferred embodiment, with particular reference to Figures 1 and 3, the supply means for supplying the liquid substance to the container space Ib are arranged in elongate distribution means 41 and 42 parallel to the container space, which are arranged on the sides of the container space 1. In practice, the distribution means 42 and 41 consist of a free space inside the body beams 13 and 14, from which the liquid fed in at arrows B is discharged through horizontal holes (not shown) in the direction of arrows C, the liquid 5 passing evenly on the rock wool filter 2 from the sides. Said method makes efficient use of the actual mechanical frame structure of the device for bringing and dispensing the desired liquid into the tank for cleaning.

. In the figures, the device comprises horizontal pedestal structures 200 on which the device rests against a substrate, such as the ground. In addition, the device comprises vertical frame structures 210 on which the container rests on pedestal structures 200. For the lower container part Ib of the device, it is noted that the container sides / bottoms Id and le are inclined towards the discharge means 30, i.e. the tube 4. The sides / bottoms id and le tilt both longitudinally and transversely direction.

Although the invention has been described above with reference to the examples according to the accompanying drawings, it is clear that the invention is not limited thereto, but can be modified in many ways within the scope of the inventive idea set forth in the appended claims.

Claims (3)

12 96488 An apparatus for filtering a liquid substance, for example for wastewater treatment, comprising a tank space (1), filter means (2) arranged in the tank space, supply means (3) for supplying liquid substance to the tank space, discharge means (4) for passing liquid (2) through the filter means (2). 5) for removing from the device, and means (9) for regenerating the surface layer of the filter means (2) by mechanically treating the surface layer of the filter means (2), wherein the means (9) for regenerating the surface layer of the filter means (2) is arranged in a carriage structure 11 above the tank space (1) ) and the carriage structure (11) at least in part comprise means (12, 12a-15 12f) for moving the carriage structure relative to the tank space (1) towards the end (le) of the tank space, characterized in that the device further comprises moving the tank space (1) to the end (le) ) formed an upwardly inclined surface (31), after the oblique surface a space 20 (32), and a transfer means (33) at least partially arranged in the intermediate space (32) for regenerating from the surface of the filter means (2) to remove the detached material from the device. Device according to Claim 1, characterized in that the transfer means (33) is a screw. Device according to claim 1, characterized in that the filter means (2) is a plate-shaped lining-wool filter. lit »I.IU 1.1« '13 96488