JP2007090258A - Apparatus for treating drainage - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enhance a maintenance performance by realizing with an easy and simple apparatus to maintain a treatment function by removing sludge from a place excessively attaching the sludge to be blocked particularly in a biological treatment tank using an oscillating bed for an apparatus for treating drainage. <P>SOLUTION: The apparatus comprises a treatment tank 2 for biologically treating the drainage, the oscillating bed 3 provided in the treatment tank 2 and a rubbing rod 7 placed so as to bring it into contact with the oscillating bed 3, wherein further the sludge at the blocking place can easily be removed by making the oscillating bed 3 movable. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for treating sludge discharged from a wastewater treatment system and a treatment apparatus using the method.

  Conventionally, as a means for improving the treatment performance of a wastewater treatment apparatus that decomposes organic matter in wastewater with microorganisms, a biological carrier that adsorbs and holds microorganisms in the treated water inside the treatment tank is known. Recently, those using a rocking bed as a biological carrier are attracting attention.

  This rocking floor has a water-repellent trunk stretched vertically, and a plurality of hydrophilic branches made of hydrophilic fibers are radiated perpendicularly to the water flow parallel to the trunk and radially from the trunk. In this arrangement, the trunk is supported by an oscillating floor support portion fixed in the processing tank. In addition, the hydrophilic branch is hydrophilic so that sludge easily adheres, and although it has a certain thickness, it has flexibility, the rear end side is attached to the trunk, and the tip side is a free end Oscillates with water flow. A waste water treatment apparatus is configured by arranging a large number of such swing bed type biological carriers in a bowl shape inside the treatment tank.

  The swinging bed type biological carrier attaches the sludge carried by the water flow around the swinging bed to the hydrophilic branch, and deposits and fixes it. Compared to a general wastewater treatment device that does not use a biological carrier, The sludge concentration in the tank can be kept high.

  In addition, the organic matter in the treatment tank contacts not only floating sludge but also sludge adhering to the hydrophilic branch with high efficiency, and oxidation and decomposition are promoted. Furthermore, the sludge accumulated on the rocking floor is peeled off by rocking and floats in the treatment tank again, and repeatedly adheres and peels off.

  When such a rocking bed has a low flow velocity and small rocking, the sludge is prevented from being peeled off, and the adhesion exceeds the peel and becomes finally closed. When the blockage occurs, the flow in the processing tank becomes small, and sufficient oxygen is not supplied to the blocked portion, so that the processing performance is greatly reduced. Therefore, in order to use the rocking bed stably, it is necessary to maintain the flow velocity around the rocking bed at a level that does not cause blockage.

  By the way, the waste water treatment apparatus using a general biological carrier including a swing bed is roughly divided into two types of configurations. One is called an air lift type, and is provided with an oscillating bed, a water flow passage without the oscillating bed, and an air diffuser for supplying air to the treatment tank at the bottom of the treatment tank in the water flow passage. A circulating flow of water to be treated is generated inside the treatment tank by the air lift effect of the upward flow generated by the bubbles ejected from the air diffuser. By maintaining the circulation flow rate at a certain level or higher, oxygen can be supplied to the sludge and the swing bed can be swung.

  In addition, there is a full-surface aeration type in which an air diffuser is disposed below the swing floor. In the full aeration type, water is directly passed to the rocking bed by the upward flow of bubbles ejected from the diffuser, and the rocking bed is rocked by acting both the bubbles and the water flow on the rocking bed. be able to.

  However, in any method, if the flow rate of the water to be treated is not less than a certain level, the swinging bed will not be blocked, but there is a region in the treatment tank where the flow rate decreases and a region where the water to be treated is stagnant. However, the swing bed easily clogs, and there is a problem that the biological treatment performance is lowered.

  In addition, if the attached sludge is to be removed from the rocking bed thus closed, an aeration tube is arranged below the rocking floor and aeration is strongly performed to vibrate the rocking bed vigorously to separate the attached sludge. In addition, a complicated operation such as physical separation by inserting a long rod has to be performed, and there is a problem that a lot of labor is required for maintenance.

To deal with such a problem in the swing bed, the string-like carrier elements 20 are densely arranged in the biological treatment tank 19 with a space that can be rubbed against each other by the water flow as shown in FIG. It has been proposed that excessive attached sludge is naturally peeled off by rubbing the elements 20 (see, for example, Patent Document 1).
JP 2002-191361 A

  However, in the conventional wastewater treatment apparatus such as the above-mentioned Patent Document 1, the flow velocity distribution in the treatment tank is not uniform, and all the string-like carriers on the string-like carrier elements are rubbed evenly. There was a problem that it was difficult to adjust the flow rate of the.

  In addition, in order that the flow velocity acting on the string-like carrier does not depend on the geometric arrangement in the treatment tank, it is necessary to sufficiently reduce the size of the string-like carrier element relative to the treatment tank. There was a problem that the performance deteriorated.

  Therefore, the present invention solves such a conventional problem, and in a wastewater treatment apparatus using an oscillating floor, the treatment tank is closed with a simple structure and a simple operation without providing a complicated mechanism. The purpose is to provide a wastewater treatment device that can remove and remove sludge.

  In order to achieve the above object, the present invention according to claim 1 is a treatment tank that biologically treats wastewater, a swinging bed disposed in the treatment tank, and a solid disposed in the treatment tank. The sludge is peeled off by bringing the rocking floor surface into contact with the solid.

  With this configuration, the sludge blocked in the rocking bed can be peeled and removed by contact with the solid.

  According to a second aspect of the present invention, there is provided a drive device that moves the rocking floor.

  With this configuration, the sludge that is in contact with the solid due to the movement of the swinging bed and that is blocked can be automatically removed and removed.

  The present invention according to claim 3 is characterized in that a drive device for moving the solid is provided.

  With this configuration, the sludge that is in contact with the rocking floor by moving the solid and that is blocked can be automatically removed and removed.

  The present invention according to claim 4 is characterized in that the solid is installed at a distance equal to or less than a radius of the rocking floor from the axis of the rocking floor.

  With this configuration, the solid and the sludge blocked in the rocking floor are in reliable contact with each other, and the sludge can be reliably peeled and removed.

  The present invention according to claim 5 is characterized in that the solid is a rubbing rod having a rod shape.

  With this configuration, the frictional resistance can be reduced at the start of contact between the sludge blocked in the rocking floor and the solid, and the sludge can be peeled and removed.

  The present invention according to claim 6 is characterized in that a plurality of the rubbing rods are provided.

  With this configuration, both sides of the trunk of the swing floor come into contact with the solid one side at a time, so that sludge on both sides of the trunk can be peeled and removed.

  The present invention according to claim 7 is characterized in that the solid is a flat plate installed in parallel with an axis of a rocking floor.

  With this configuration, the contact time between the sludge and the solid becomes longer, and the sludge can be peeled and removed more reliably.

  The present invention according to claim 8 is characterized in that the flat plate is a wall surface of the processing tank.

  With this configuration, it is possible to peel and remove the sludge blocked in the rocking floor without newly providing a solid.

  The present invention according to claim 9 is characterized in that a gap having a diameter equal to or less than the diameter of the swing bed is provided in the solid, and the swing bed is passed through the gap.

  With this configuration, sludge blocked over the entire circumference of the trunk of the rocking floor can be peeled and removed by contact with the solid.

  The present invention according to claim 10 is characterized in that the solid is constituted by two or more rubbing rods.

  With this configuration, the sludge on both sides of the trunk can be peeled and removed by simultaneously bringing both sides of the trunk of the rocking floor into contact with the solid.

  The present invention according to claim 11 is characterized in that the solid is formed of a plate material.

  With this configuration, both sides of the trunk of the rocking floor come into contact with the solid at the same time, so that the sludge on both sides of the trunk can be removed and removed, and the contact time between the sludge and the solid becomes longer, and the sludge is more reliably removed and removed. it can.

  The present invention according to claim 12 is characterized in that the solid is constituted by a cylindrical tube.

  With this configuration, both sides of the trunk of the rocking floor come into contact with the solid at the same time, so that the sludge on both sides of the trunk can be removed and removed, and the contact time between the sludge and the solid becomes longer, and the sludge is more reliably removed and removed. it can.

  According to a thirteenth aspect of the present invention, a blockage detecting means for detecting a blockage of the swinging bed is installed inside the processing tank, and the blockage detection unit detects the blockage of the swinging bed and operates the driving device. It is characterized by that.

  With this configuration, the operation start time of the drive device becomes clear and stable processing can be performed.

  The present invention according to claim 14 is characterized in that a flow velocity sensor is installed as a blockage detecting means below the swing bed.

  With this configuration, the operation start time of the drive device becomes clear and stable processing can be performed.

  A fifteenth aspect of the present invention is the maintenance method according to the first aspect, wherein the sludge on the surface of the rocking floor is peeled off by operating the rocking floor.

  By this method, the sludge blocked in the rocking bed can be peeled and removed by contact with the solid, and the maintainability is improved.

  A sixteenth aspect of the present invention is the maintenance method according to the first aspect, wherein the sludge on the surface of the rocking floor is peeled off by operating the solid.

  By this method, the sludge blocked in the rocking bed can be peeled and removed by contact with the solid, and the maintainability is improved.

  With the configuration as described above, the maintenance of the closed rocking floor can be easily performed by a simple operation. Further, since complicated condition setting such as flow velocity distribution in the processing tank is not required, normal operation (processing) can be easily performed with a simple operation.

  Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1)
Fig.1 (a) is a front view of the structure of the waste water treatment apparatus 1 which performs waste water treatment by biological treatment, (b) has shown the block diagram of the AA cross-section part of (a). The wastewater treatment apparatus 1 includes a container-like treatment tank 2, a rocking bed 3 as a microorganism carrier disposed inside the treatment tank 2, and an air diffuser 4 disposed below the rocking bed 3. .

  In the present embodiment, a disk-shaped diffuser is used as the diffuser 4. However, the shape of the diffuser is not limited, and the shape may be a rod or a sphere, and finer bubbles. Special processing may be applied so as to generate.

  The swing floor 3 has a structure in which a plurality of hydrophilic branches 6 formed of hydrophilic fibers are arranged on a trunk 5 formed of water-repellent fibers perpendicularly to the trunk 5 at a predetermined interval. . The hydrophilic branch 6 is hydrophilic so that sludge easily adheres, has a certain thickness, but is flexible, the rear end side is attached to the trunk 5, and the front end side is a free end. So it swings with water flow. In addition, the trunk 5 is fixed in an annular shape by a plurality of rubbing rods 7 so as to have an appropriate tension, and constitutes the swing bed 3 as a biological carrier. The rubbing bar 7 has both the function of fixing the rocking floor 3 and the function of scrubbing the sludge adhering to the rocking floor 3 and the hydrophilic branch 6. When the hydrophilic branch 6 comes into contact with the rubbing bar 7, the friction force causes the sludge. Is peeled off.

  The rocking floor 3 supported and fixed by the rubbing bar 7 can be moved in the axial direction of the trunk 5 by being connected to the driving device 8. The connection method between the swing floor 3 and the drive device 8 is not particularly limited. For example, the trunk 5 of the swing floor 3 is connected to the drive device 8 having a rotating shaft through a gear. Can be sent out in the axial direction to rotate the rocking floor 3.

  Further, among the plurality of rubbing rods 7, at least one rubbing rod 7 is arranged outside the trunk 5 fixed in an annular shape so that the contact surface with the rocking floor 3 is opposite. The air diffuser 4 has a disk shape with a large number of pores on the surface, and is connected to the air supply pipe 9. The air supply pipe 9 is vertically arranged from the outside of the processing tank 2 toward the bottom of the processing tank 2 and is supported at the lower part of the processing tank 2 so that the air diffuser 4 is disposed at an appropriate position of the processing tank 2. It is fixed. The air supply pipe 9 is connected to a blower (not shown) outside the processing tank 2.

  In the above configuration, water to be treated such as domestic wastewater containing organic matter is supplied to the treatment tank 2. Here, air is supplied to the air diffuser 4 from a blower (not shown), and fine bubbles are ejected vigorously to the upper swing bed 3, and as a result, the aerobic bubbles rise up the swing bed 3. As a result, a rising water current is generated. On the other hand, while the aerobic bubbles ejected from the air diffuser 4 rise to the water surface, oxygen dissolves in the water to be treated and supplies oxygen to the microorganisms in the sludge. The organic matter in the water to be treated is oxidized and decomposed into sludge while flowing in the treatment tank 2 in a water stream. Further, the sludge floating by the flow adheres to and accumulates on the hydrophilic branch 6 of the rocking bed 3, and the sludge concentration in the treatment tank 2 is kept high. The organic matter in the treatment tank 2 comes into contact with sludge adhering to the hydrophilic branch 6 as well as the suspended sludge with high efficiency, and oxidation / decomposition is promoted.

  Here, in the sludge deposited on the hydrophilic branch 6, not only bacteria, but also food chains such as protozoa and protozoa, rotifers, earthworms, etc., which are upper predators, are generated due to the presence of stable scaffolds. Protozoa has the property of producing a large amount of sticky metabolites, and the sludge adhering to the hydrophilic branch 6 is firmly fixed and held by these metabolites.

  In addition, when the sludge adhering to the tip of the hydrophilic branch 6 becomes a certain size, the sludge at the tip of the hydrophilic branch 6 is peeled off and released again into the water flow due to the swinging of the water flow. Dropping is prevented. Furthermore, the peeled sludge becomes harder and larger particles than before due to sticky metabolites.

  In this way, the sludge that was initially fine in the treatment tank 2 is repeatedly coarsened by adhering to and peeling from the hydrophilic branch 6 and the sedimentation is improved, thereby causing bulking in the subsequent sedimentation tank (not shown). There is also an advantage that the sludge concentration can be increased without causing it.

  By the way, when the waste water treatment apparatus 1 using such sludge is continuously used, the swing bed 3 is swung in the corner of the treatment tank 2 or in a region where the water flow from the air diffuser 4 does not hit. For this reason, a sufficient flow rate cannot be obtained. Therefore, after a certain period of time, sludge is excessively attached to the rocking floor 3 and the blockage occurs. When the blockage occurs, sufficient oxygen is not supplied to the sludge at the blockage portion, so that the sludge does not function and the processing performance is lowered.

  In general, a diffuser is disposed under the blockage portion of the swing bed 3 to perform strong aeration, and the sludge is peeled off from the swing bed 3 by applying a strong flow rate and bubbles. Alternatively, maintenance is performed such that a bar-shaped object is pierced into the closed portion of the rocking floor 3 and physically separated.

  In the case of removing sludge from the closed portion in the wastewater treatment apparatus 1 of the present embodiment, the swinging floor 3 is sent out in the axial direction of the trunk 5 by the driving device 8. The fed rocking floor 3 comes into contact with the rubbing rod 7, and the sludge adhering to the hydrophilic branch 6 is peeled off by the frictional force generated at that time. Since the frictional force generated by the rubbing bar 7 is limited to the contact portion with the hydrophilic branch 6, the rubbing bar 7 is disposed on both the left and right sides of the trunk 5 as shown in FIG. The sludge on both sides can be removed.

  In this way, the sludge on the entire surface of the rocking floor 3 can be easily peeled by moving the driving device 8. By performing such maintenance regularly, the blockage part of the rocking floor 3 is removed, and the processing performance can be prevented from deteriorating. Moreover, since the clogged sludge is reliably removed by the rubbing rod 7, it is not necessary to perform a complicated operation such as optimizing the flow velocity distribution in the treatment tank 2.

  The shape of the rubbing rod 7 may be any shape as long as it can support and fix the rocking floor 3 and generate a frictional force with the hydrophilic branch 6, and may have a shape like a pulley or a gear.

  Further, the driving device 8 is not limited to a mechanism that drives independently, but may be a mechanism that generates a driving force by a manual operation. In that case, for example, by rotating a handle (not shown) provided outside the waste water treatment device 1 by manual operation, the rotational force is transmitted via the gear provided in the drive device 8, and the vibration is The moving bed 3 is sent out in the axial direction of the trunk 5.

  Further, in the present embodiment, the trunk 5 of the rocking floor 3 is fixed in a ring shape with the rubbing rod 7, but if the rubbing rod 7 can be applied to the entire surface of the trunk 5 of the rocking floor 3, The shape is not limited. For example, the sludge may be removed as described above by causing the trunk 5 of the linear rocking floor 3 to reciprocate by the drive device 8 and to act on the rubbing rod 7.

  Further, in the present embodiment, one trunk 5 of the rocking floor 3 is fixed in an annular shape, but a plurality of trunks 5 can be connected to the rubbing rod 7 in a bowl shape. And the processing performance can be improved.

(Embodiment 2)
FIG. 2 shows another embodiment of the present invention. In addition, about the thing which has the structure similar to Embodiment 1, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The concept of FIG. 2 is the same as in the first embodiment, but the support bar 11 is provided for the purpose of supporting and fixing the rocking floor 3 in an annular shape, and a flat plate 10 is disposed so as to contact the hydrophilic branch 6, and between them. The sludge is peeled off by the generated frictional force. The gap between the flat plate 10 and the trunk 5 is set to be equal to or less than the radius of the rocking floor 3, that is, the distance from the trunk 5 is equal to or less than the length of the hydrophilic branch 6, and the flat plate 10 is brought into contact with the hydrophilic branch 6. To remove sludge. At this time, the peeling strength of the sludge can be adjusted by adjusting the space between the flat plate 10 and the trunk 5.

(Embodiment 3)
FIG. 3 also shows another embodiment. FIG.3 (c) has shown BB sectional drawing of the cylindrical tube 12 of (a). In addition, about the thing which has the structure similar to Embodiment 1 and Embodiment 2, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  The concept of FIG. 3 is the same as that of the second embodiment. However, instead of the flat plate 10 of the second embodiment, the cylindrical tube 12 is arranged so that the hydrophilic branch 6 and the inner surface of the cylindrical tube 12 are in contact with each other. The sludge is peeled off by the frictional force that is generated.

  Furthermore, the blockage of the rocking bed 3 is monitored by installing a dissolved oxygen concentration meter 13 as a blockage detection means at a position less than the radius of the rocking bed 3, that is, the distance from the trunk 5 is equal to or less than the length of the hydrophilic branch 6. can do. When the rocking bed 3 is blocked, sufficient oxygen is not supplied to the center of the rocking bed 3, that is, around the trunk 5, so that the dissolved oxygen concentration is lowered. This change is detected by the dissolved oxygen concentration meter 13, and when the dissolved oxygen concentration reaches 0.5 mg / L, the drive device 8 is moved by the control device 14 to automatically remove the sludge from the blocked portion of the rocking bed 3. Can do.

  The cylindrical tube 12 may have any shape as long as the inner surface of the cylindrical tube 12 can contact the hydrophilic branch 6. The openings may be square or triangular.

(Embodiment 4)
FIG. 4 also shows another embodiment. In addition, about the thing which has the structure similar to Embodiment 1-3, the same code | symbol is attached | subjected and the description is abbreviate | omitted.

  In FIG. 4, the support frame 15 is a metal angle assembled into a cube, and a foot is provided on the bottom surface of the support frame 15, and a space is provided below the diffuser 4 so as to be fixed to the bottom of the waste water treatment apparatus 1. The upper and lower ends of the trunk 5 of the swing floor 3 are supported and fixed in the frame of the support frame 15.

  A ring 17 whose inner diameter is equal to or smaller than the diameter of the swing floor 3 is passed through the trunk 5 of the swing floor 3. Since the ring 17 is tied to one end of the suspension string 18 and the other is coming out of the water surface of the waste water treatment apparatus 1, the ring 17 can be moved up and down along the trunk 5 by pulling the suspension string 18. Further, since the ring 17 is made of metal and has a certain weight, when the hanging strap 18 is released, the ring 17 falls due to gravity and is normally located at the bottom of the swinging floor 3.

  The rocking bed 3 is provided with a dissolved oxygen concentration meter 13 as a blockage detecting means. When the dissolved oxygen concentration reaches 0.5 mg / L, the control device 14 causes the alarm device 16 to emit a signal such as light emission. By observing this signal, the closed state of the rocking floor 3 is grasped, and when the blockage occurs, the ring 17 is pulled up to above the rocking floor 3 by pulling the suspension string 18 and brought into contact with the hydrophilic branch 6 to remove the sludge. Remove. When the sludge is peeled off, the hanging string 18 is released and the ring 17 is dropped onto the bottom of the rocking floor 3.

  In addition, the position of the ring 17 in a normal state is not limited at all, and the position is not the bottom, but is removed from the central part, the upper part of the swinging floor 3 or the swinging floor 3 and stored in another place. May be.

  Since this method does not require any complicated mechanism, it is low-cost and easy to maintain.

  As described above, since the wastewater treatment apparatus in the present invention can achieve both high wastewater treatment performance and maintainability, it will greatly contribute to future environmental business.

The block diagram of the waste water treatment equipment of Embodiment 1 of the present invention ((a) is a front view, (b) is the block diagram of an AA section part) Configuration diagram of waste water treatment apparatus of the second embodiment ((a) is a front view, (b) is a configuration diagram of a cross section of AA) Configuration diagram of waste water treatment apparatus of Embodiment 3 ((a) is a front view, (b) is a configuration diagram of AA cross section, (c) is a BB cross sectional view of cylindrical tube 12) The block diagram of the waste water treatment equipment of Embodiment 4 ((a) is a front view, (b) is a block diagram of an AA cross-section part) The figure which shows an example of the conventional waste water treatment equipment

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Waste water treatment apparatus 2 Treatment tank 3 Rocking bed 4 Air diffuser part 5 Stem 6 Hydrophilic branch 7 Rub stick 8 Drive apparatus 9 Air supply pipe 10 Flat plate 11 Support bar 12 Cylindrical pipe 13 Dissolved oxygen concentration meter 14 Control apparatus 15 Support frame 16 Alarm 17 Ring 18 Suspension string 19 Biological treatment tank 20 String carrier element 21 Base

Claims (16)

A treatment tank for biologically treating the waste water; a rocking bed disposed in the treatment tank; and a solid disposed in the treatment tank. The sludge is obtained by contacting the surface of the rocking floor with the solid. A wastewater treatment apparatus characterized by peeling off the water. The wastewater treatment apparatus according to claim 1, further comprising a drive device that moves the rocking floor. The wastewater treatment apparatus according to claim 1, further comprising a drive device that moves the solid. The wastewater treatment apparatus according to any one of claims 1 to 3, wherein the solid is installed at a distance equal to or less than a radius of the swing floor from the shaft of the swing floor. The wastewater treatment apparatus according to any one of claims 1 to 4, wherein the solid is a rubbing rod having a bar shape. The wastewater treatment apparatus according to claim 5, wherein a plurality of rubbing rods are installed. The wastewater treatment apparatus according to claim 4, wherein the solid is a flat plate installed in parallel with an axis of a rocking floor. The waste water treatment apparatus according to claim 7, wherein the flat plate is a wall surface of the treatment tank. The waste water treatment apparatus according to any one of claims 1 to 3, wherein a gap having a diameter equal to or smaller than the diameter of the swing bed is provided in the solid, and the swing bed passes through the gap. The wastewater treatment apparatus according to claim 9, wherein the solid is composed of two or more rubbing bars. The wastewater treatment apparatus according to claim 9, wherein the solid is made of a plate material. The wastewater treatment apparatus according to claim 9, wherein the solid is a cylindrical tube. 13. A blockage detecting means for detecting blockage of the swing bed is installed in the treatment tank, and the drive device is operated by detecting the blockage of the swing bed by the blockage detecting means. The waste water treatment apparatus in any one of. The wastewater treatment apparatus according to claim 13, wherein a flow velocity sensor is installed as a blockage detection unit below the swing floor. The wastewater treatment apparatus according to claim 1, wherein the rocking floor is operated to rub against the solid. 2. The maintenance method according to claim 1, wherein the solid is operated and rubbed against the swing floor.

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