JP2013226524A - Water treatment equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable water treatment to be efficiently carried out without increasing in size of equipment.SOLUTION: While treated water 13 is moved along a long side direction of an aeration type slender treatment tank 11, the treated water 13 is treated. At an upstream side part of the treatment tank 11, multiple rocking beds 14 including contact materials 15 and a diffuser 18 which can supply air to the rocking beds 14 are arranged. At a downstream side part of the treatment tank 11, the rocking beds are not arranged and a diffuser 20 which can supply air to the treated water 13 is arranged. A supply channel 31 which supplies the treated water 13 to the treatment tank 11 can supply a part of the treated water 13 to the upstream side part provided with the rocking beds 14 in the treatment tank 11 and can supply the residual part of the treated water 13 to the downstream side part which is not provided with the rocking beds 14 in the treatment tank 11. Each of rocking beds 14 is provided with a rectifying member 30 which is used for preventing disorder of water flow passing through the rocking bed 14 and for separating the interior and exterior of the rocking bed 14.

Description

  The present invention relates to a water treatment facility.

  Standard methods for treating organic wastewater include the standard activated sludge method, including public sewerage. As a water treatment facility for implementing the standard activated sludge method, for example, an anaerobic tank is installed at the front stage, and an aerobic tank is installed at the rear stage. Nitrogen, then oxidative decomposition of organic compounds and nitrification of ammonia by nitrifying bacteria to activated sludge in the presence of oxygen in an aerobic tank, and return the nitrifying liquid from the aerobic tank to the anaerobic tank One that promotes the denitrification reaction in the tank is known. Such a water treatment facility is described in Patent Document 1 and the like.

JP-A-5-317884 (particularly [0004], FIG. 3)

  However, in such a known water treatment facility, it is necessary to install an anaerobic tank and an aerobic tank separately, and both the anaerobic tank and the aerobic tank have a low treatment efficiency, so that they are relatively large. Therefore, there is a problem that the entire equipment is necessarily enlarged.

  Accordingly, the present invention aims to solve such problems and enable efficient water treatment without increasing the size of the equipment, and in particular, improves existing equipment to improve its water treatment efficiency. It aims to be able to improve.

In order to achieve this object, the water treatment facility of the present invention comprises:
It is configured to treat the water to be treated while moving the water to be treated along the longitudinal direction of the aeration-type elongated treatment tank,
A plurality of oscillating beds provided with a contact material and a first air diffuser capable of supplying air to the oscillating beds are provided on the upstream side of the treatment tank in the moving direction of the water to be treated. ,
In the downstream part of the treatment tank along the direction of movement of the water to be treated, there is provided a second air diffuser capable of supplying air to the water to be treated without providing a rocking floor.
A supply path capable of supplying water to be treated to the treatment tank is provided,
The supply path can supply a part of the water to be treated to the upstream portion provided with a plurality of swing beds in the treatment tank, and the remaining portion of the water to be treated can be supplied to the swing bed in the treatment tank. Can be supplied to the downstream portion not provided,
The oscillating floor has a rectifying member configured to partition the inside of the oscillating bed from the outside for preventing the water flow passing through the oscillating bed from being disturbed.

  With such a configuration, since a plurality of swing beds are provided in the upstream portion of the aeration-type treatment tank, the water treatment capacity can be improved as compared with the case where this is not provided, and thus the facilities are increased. Water treatment can be performed efficiently without shaping. Even if the rocking floor is supplied with air from the air diffuser, the inside can be made an anaerobic atmosphere, so that only the treatment tank of the present invention is used, and there is no need to install an anaerobic tank separately. Both the anaerobic process and the aerobic process can be performed. In the rocking bed, the sludge is peeled off from the contact material, but when the peeled sludge flows down to the downstream side where the second air diffuser is provided, water treatment with the peeled sludge is performed. Is possible. Therefore, the to-be-processed water supplied to the downstream part by the supply path can be processed with this peeling sludge. For this reason, according to this invention, the water treatment capacity of the tank can be improved only by installing a rocking | swiveling floor in the upstream part in the existing aeration tank. If the existing equipment is equipped with both an anaerobic tank and an aerobic aeration tank, only an aeration tank can be used without using an anaerobic tank, and processing can be performed more efficiently than before. Therefore, it is possible to reduce the size of the equipment.

  In addition, since the swing bed has a rectifying member for preventing the water flow passing through the swing bed from being disturbed, the contact material of the swing bed is covered along the longitudinal direction of the elongated treatment tank. The contact material, despite the fact that it receives two water streams, a stream of treated water and a stream of water supplied by the buoyancy of the air supplied into the treated water from the first air diffuser. It is possible to prevent the turbulence from occurring at these positions. For this reason, it can prevent reliably that a contact material vibrates too much based on disturbance of a water flow, or a contact material cut | disconnects by it.

It is a figure which shows the water treatment equipment of embodiment of this invention. It is an enlarged plan view of the water treatment facility. It is a figure which expands and shows the cross section of the front view of the water treatment facility. It is a figure which expands and shows the cross section of the side view of the water treatment equipment. It is a three-dimensional view of the rocking floor in the water treatment facility. It is a figure which expands and shows the cross section of the side view of the principal part of the water treatment facility. It is a figure showing the whole system of the water treatment equipment.

  In the treatment facility shown in FIG. 1, reference numeral 11 denotes an aeration-type treatment tank, which is constituted by, for example, a concrete wall 12. The treatment tank 11 shown in FIG. 1 is illustrated as being shallow and long, and examples thereof include a width of about 15 to 20 meters, a length of about 120 meters, and a water depth of about 3 to 4 meters. In the treatment tank 11 shown in FIG. 1, the treated water 13 is treated while moving the treated water 13 inside the treatment tank 11 from the left side to the right side of the drawing.

  As shown in FIG. 1 to FIG. 4, a plurality of swing beds 14 are provided on the left side of FIG. 1 in the treatment tank 11, that is, on the upstream side of the treatment tank 11 along the moving direction of the water to be treated 13. Is provided. Each swing floor 14 has a swing floor main body 16 having a large number of contact members 15 and a space 17 formed below the main body 16. In the space 17, there is provided a diffuser 18 having a perforated pipe structure as a first air diffuser for air diffusion to the contact material 15 of the swing floor main body 16.

  As shown in the drawing, a plurality of the swing beds 14 are continuously arranged in a row in the length direction of the processing bath 11, and a plurality of rows are arranged in the width direction of the processing bath 11. The even bed is arranged in the width direction of the treatment tank 11 in the swing floor 14, and a space 19 is formed across the length direction of the treatment tank 11 between the pair of rows.

  In the portion other than the installation location of the swing floor 14 in the treatment tank 11, that is, in the portion downstream of the installation location of the swing floor 14 along the moving direction of the water to be treated 13 in the treatment tank 11, the upstream portion Such a swing floor 14 is not installed. A diffuser 20 having a perforated pipe structure as a second air diffuser for aeration is installed over the entire bottom of the tank at the downstream portion. As shown in the figure, the arrangement pitch of the diffusers 18 provided in the space 17 of the rocking floor 14 for supplying air to the contact material 15 is larger than the arrangement pitch of the diffusers 20 in the downstream portion of the processing tank 11. Is designed to be smaller. That is, it is configured such that a larger amount of air is supplied to the swing bed 14 in the upstream portion than the downstream portion where the swing bed is not installed in the treatment tank 11.

  FIG. 5 shows a detailed structure of the swing floor 14. In FIG. 5, reference numeral 22 denotes a frame for constituting the swing floor, and is formed in a rectangular parallelepiped shape using a member 23 such as a channel material, whereby a frame for the main body portion 16 of the swing floor 14. Is configured. Legs 24 are formed by vertically lowering the vertical members 23 a constituting the frame body 22, and the portion surrounded by these legs 24 is the space 17 described above.

  A plurality of solid or hollow bars 25 and 26 are arranged in the horizontal direction at the top and bottom of the main body 16 so as to be parallel to each other. Each bar 25 at the top and each bar 26 at the bottom make a pair, and a plurality of contact members 15 are passed between the pair of bars 25, 26.

  Each contact member 15 includes a vertical core member 27 extending between a pair of rods 25 and 26, and a number of tufts protruding radially from the core member 27 over the length of the core member 27. Thread 28. The core material 27 is formed of a thread-like material that is difficult for microorganisms to adhere to. The tufted yarn 28 is formed of a bulky fiber such as an acrylic high bulk fiber to which microorganisms easily adhere. As shown in the figure, a large number of contact members 15 are arranged on the main body 16 of the rocking floor 14 along the vertical direction and the horizontal direction, respectively. That is, a large number of contact materials 15 are accommodated in one swing floor 14.

  One side surface of one rocking floor 14 is covered with a flat plate-like rectifying member 30. Thereby, each rocking floor 14 is partitioned between the inside and the outside on one side surface thereof. As shown in FIGS. 2, 4, and 6, each oscillating floor 14 has its rectifying member 30 facing the space 19, that is, the inside of the oscillating floor 14 and the space 19 are partitioned by the rectifying member 30. It is configured as follows.

  31 is a supply path for supplying the treated water 13 to the treatment tank 11. The supply path 31 has supply ports 32 for supplying the water to be treated 13 to the treatment tank 11 at a plurality of positions along the length direction of the treatment tank 11. That is, the supply path 31 is provided with the treated water 13, the upstream portion of the treatment tank 11 where the rocking floor 14 is provided, and the diffuser 20 for air diffusion without the rocking floor. It is possible to supply or inject separately from the downstream portion.

  In the example shown in the drawing, the plurality of swing beds 14 are installed in an upstream quarter portion along the length direction of the treatment tank 11. The most upstream supply port 32 is installed at a position on the upstream end side of the portion of the processing tank 11 where the rocking floor 14 is provided. The other supply ports 32 are installed at three positions spaced from the most upstream supply port 32 by a quarter of the length of the processing tank 11. That is, the processing tank 11 is installed at a position on the upstream end side of the region corresponding to the region divided into four equal parts along the length direction. Although the boundary between the portion where the swing floor 14 is provided and the portion downstream thereof is clear, the boundary 33 between the partition areas of the portion where the swing floor is not provided is virtual. A partition wall can be provided at the boundary 33.

In the illustrated example, for example, when 20 kg BOD / m ³ · day of water to be treated is supplied from the supply path 31 to the treatment tank 11, the water is provided at a position on the upstream end side of the portion where the rocking floor 14 is provided. Water to be treated is supplied from the supply port 32 at 10 kg BOD / m ³ · day, and at the supply port 32 on the downstream side, 4 kg BOD / m ³ · day, 3. 5 kg BOD / m ³ · day, 2.5 kg BOD / m ³ · day.

  FIG. 7 shows a schematic configuration of the entire facility using the processing tank 11 shown in FIGS. Here, 35 is a screen to which raw water is supplied, and an adjustment tank 36 is installed on the downstream side thereof. And the processing tank 11 shown by FIGS. 1-6 is installed in the downstream of the adjustment tank 36. FIG. A sedimentation tank 37 and a sand filtration device 38 are installed in this order on the downstream side of the processing tank 11. The sand filter 38 can discharge treated water. Although the sedimentation tank 37 can precipitate the sludge contained in the water to be treated, a part of the settled sludge is fed to the sludge concentration tank 39 and the remainder is returned to the treatment tank 11 as a return sludge 40. It is configured to be returned. Reference numeral 41 denotes a dehydrator that can dewater the concentrated sludge from the sludge concentration tank 39 to generate sludge having a reduced moisture content.

  In such a configuration, when the water to be treated 13 is supplied from the supply path 31 to the upstream portion of the treatment tank 11 where the rocking floor 14 is installed after passing through the screen 35 and the adjustment tank 36, The treated water 13 starts moving toward the downstream side of the treatment tank 11. As a result, the water to be treated 13 enters the inside of the rocking floor 14. At this time, the air bubbles 42 discharged into the water from the diffuser 18 for air diffusion are covered in the rocking floor 14 as shown in FIG. It rises by receiving buoyancy from the treated water 13, and an upward flow 43 is generated in the treated water 13. And the aerobic process is performed in the part of the tufted yarn 28 because the upflow 43 containing this bubble 42 contacts the contact material 15. As a result, when the sludge adheres to the contact material 15 and the sludge adhesion amount becomes a certain amount or more, the air bubbles 42 are no longer contacted at the central portion of the contact material 15, so that an anaerobic atmosphere is formed and the anaerobic treatment is performed. Will be done.

  For this reason, although the processing tank 11 is an aeration tank provided with the diffusers 18 and 20, that is, an aerobic tank, it can perform both an aerobic process and an anaerobic process. For this reason, when the processing tank 11 provided with the rocking floor 14 is used, as shown in FIG. 7, even if the anaerobic tank is not installed in front of the processing tank 11, that is, the anaerobic tank is omitted. Both anaerobic treatment and aerobic treatment can be performed.

  As shown in FIG. 6, the upward flow 43 that has risen inside the rocking floor 14 descends the space 19 and returns to the original state. That is, the circulation flow 44 passes through the swing bed 14 and the space 19. At this time, the flow of the water to be treated 13 from the upstream side to the downstream side of the treatment tank 11 is present in the swing bed 14 as described above. That is, a complicated flow exists inside the rocking floor 14.

  However, since the flat rectifying member 30 is provided as shown in the figure, it is possible to prevent the circulating flow 44 from being disturbed. Further, since the flow regulating member 30 is provided, the water to be treated 13 that flows from the upstream side to the downstream side of the treatment tank 11 through the inside of the swing bed 14 also flows out of the swing bed 14 to the space 19, thereby causing disturbance. In addition, the water to be treated 13 that flows from the upstream side to the downstream side of the treatment tank 11 in the space 19 enters the inside of the swing bed 14 from the space 19, so that no disturbance occurs. Therefore, a stable flow is generated inside the rocking floor 14.

  In the oscillating floor 14, the tufted yarn 28 of the contact material 15 vibrates in response to the flow of the water to be treated 13, and the sludge that adheres to the contact material 15 and grows is peeled off by the vibration. Can be achieved. However, if the flow inside the oscillating bed 14 is disturbed, the tufted yarn 28 may vibrate too much and the processing efficiency may decrease. Moreover, if it vibrates too much, the thread-like contact material may be cut. On the other hand, the provision of the rectifying member 30 as shown in the figure can surely prevent such inconvenience.

  The sludge separated from the contact material 15 when the tufted yarns 28 are appropriately swung by the water flow becomes fine granular granule sludge. This granular sludge flows into the part where the rocking bed 14 is not installed on the downstream side of the treatment tank 11 by the water flow. In the portion where the rocking floor 14 is not installed, a part of the water to be treated flows from the adjustment tank 36 through the supply port 32 of the supply path 31. For this reason, this part can be treated with sludge in an aerobic atmosphere using granular sludge, and coupled with the supply of the returned sludge 40 from the sludge concentration tank 39 shown in FIG. Functions as a processing tank. Specifically, by using the load distribution as in the example described above and in which specific numerical values are entered in FIG. 1, it is possible to efficiently perform processing using granule sludge.

  In this way, the waste water treatment in the treatment tank 11 is performed. The treated water is sent to a sedimentation tank 37 as shown in FIG. The resulting supernatant water is discharged out of the system as treated water after passing through the sand filter 38. In the sedimentation tank 37, the sludge contained in the water to be treated is settled, and is extracted to the outside of the sedimentation tank 37 while containing moisture. A part of the extracted sludge is returned to the treatment tank 11 as the return sludge 40 and is subjected to the above-described activated sludge treatment. The remaining sludge withdrawn from the settling tank 37 is concentrated in the sludge concentration tank 39, and after most of the water is removed by the dehydrator 41, it is discharged out of the system as solid or near sludge. .

  The treatment tank 11 can be newly installed, but an existing aeration tank can be modified and used. That is, by using the swing bed 14, the processing capacity is remarkably improved as compared with the case where this is not used. Therefore, only by installing a large number of the swing floor 14 only in the upstream portion of the existing aeration tank, A processing capacity equivalent to or better than a system combining an existing anaerobic tank and aeration tank can be achieved. Therefore, a new system can be constructed after removing the anaerobic tank from the existing system, which is extremely efficient.

DESCRIPTION OF SYMBOLS 11 Treatment tank 13 Water to be treated 14 Rocking bed 15 Contact material 18 Diffuser (first diffuser)
20 Diffuser (second diffuser)
27 Core material 28 Tufted thread 30 Rectifying member 31 Supply path 32 Supply port

Claims (1)

It is configured to treat the water to be treated while moving the water to be treated along the longitudinal direction of the aeration-type elongated treatment tank,
A plurality of oscillating beds provided with a contact material and a first air diffuser capable of supplying air to the oscillating beds are provided on the upstream side of the treatment tank in the moving direction of the water to be treated. ,
In the downstream part of the treatment tank along the direction of movement of the water to be treated, there is provided a second air diffuser capable of supplying air to the water to be treated without providing a rocking floor.
A supply path capable of supplying water to be treated to the treatment tank is provided,
The supply path can supply a part of the water to be treated to the upstream portion provided with a plurality of swing beds in the treatment tank, and the remaining portion of the water to be treated can be supplied to the swing bed in the treatment tank. Can be supplied to the downstream portion not provided,
The oscillating floor has a rectifying member configured to partition the inside of the oscillating bed from the outside so that the water flow passing through the oscillating bed does not protrude outside the oscillating bed. Water treatment equipment.

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