JP2005169241A - Aeration equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide aeration equipment which can increase the amount of oxygen supply to water to be treated while controlling the load increase on a blower. <P>SOLUTION: The aeration equipment 10 comprises an aeration tank 12 for storing the water to be treated, two partition walls 14 which are installed vertically from a height position apart from the bottom of the aeration tank 12 with a prescribed gap, and divide the aeration tank 12 into first to third channels 18, 20, 22 sequentially in the aligning direction, and air diffusers 16 which are respectively installed in the central parts of the first and third channels 18, 22 in the depth direction. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an aeration facility, and more particularly to an aeration facility suitable for treatment of wastewater such as sewage, human waste, and industrial wastewater.

  In order to prevent eutrophication of rivers, wastewater treatment facilities such as sewage treatment plants need to be denitrified and dephosphorized, and advanced treatment in reaction tanks is required. Therefore, since the occupation area of the aerobic reaction tank in the wastewater treatment plant is suppressed, an increase in the oxygen supply amount is required, so that the aeration capacity needs to be increased along with the deepening of the reaction tank.

  Under such circumstances, conventionally, aeration equipment has been used in which a partition wall is provided in the middle part of an aerobic reaction tank to form two water channels, and an air diffuser is provided in one water channel. In this aeration equipment, an ascending water flow is generated by diffusing air from the diffuser into the waste water, and a swirling water flow is generated by flowing into the other water channel. In this way, by generating a swirling water flow between the two water channels, oxygen in the air is taken into the drainage to increase the oxygen supply amount.

However, in recent years, more advanced treatment is required in the reaction tank, and further increase in aeration capacity is required. Therefore, as disclosed in Patent Document 1, a first air diffuser is provided in the middle of one of the water channels in the reaction tank, and a second air diffuser is provided at the bottom of the reaction tank to supply oxygen. Aeration equipment designed to increase the volume has been used.
Japanese Patent Laid-Open No. 9-276891

  However, since the water pressure is high at the bottom of the reaction tank and the load on the blower is high, the aeration equipment disclosed in Patent Document 1 described above requires the use of a high-pressure blower, resulting in an increase in power consumption. It was.

  The present invention has been made in view of the above circumstances, and provides an aeration facility capable of increasing the amount of oxygen supplied to the water to be treated while suppressing an increase in load on the blower. Objective.

  The aeration equipment according to the present invention is (1) an aeration tank for storing water to be treated, and (2) a vertical position from a height position that is separated from the bottom of the aeration tank by a predetermined gap. Two partition walls that divide the tank into three water channels of the first to third water channels in order in the arrangement direction; and (3) an air diffuser provided at the center in the depth direction of the first and third water channels. And.

  In this aeration facility, a diffuser is provided in each of the first and third water channels sandwiching the second water channel among the three water channels provided by dividing the aeration tank. Therefore, a swirling water flow can be generated between the first water channel and the second water channel, and between the third water channel and the second water channel, and oxygen in the air is sufficiently taken into the water to be treated. Thus, the oxygen supply amount can be increased. At this time, since the air diffuser is provided at the center in the depth direction of each water channel, the increase in the load on the blower is suppressed as compared with the case where the air diffuser is provided at the bottom of the aeration tank. Can do.

  The aeration facility may include a baffle plate provided so as to extend along the vertical direction in the second water channel. In this way, the risk of turbulent flow of the swirling water flow is reduced, and the oxygen dissolution efficiency is improved.

  The air diffuser may be provided at a depth of 4 to 6 m from the water surface. If the diffuser is provided at a position shallower than 4 m from the water surface, the contact time with the diffused air is shortened, and the swirling water flow tends not to be generated. Moreover, when the diffuser is provided at a position deeper than 6 m from the water surface, the load on the blower tends to increase.

  The aeration equipment according to the present invention is (1) an aeration tank for storing water to be treated, and (2) a vertical position from a height position that is separated from the bottom of the aeration tank by a predetermined gap. Three partition walls for sequentially dividing the tank into four water channels of the first to fourth water channels in the arrangement direction, (3) a central portion in the depth direction of one of the first and second water channels, and a third And an air diffuser provided at the center in the depth direction of either one of the fourth water channels.

  In this aeration equipment, a diffuser is provided in either one of the first and second water channels and in one of the third and fourth water channels among the four water channels provided by dividing the aeration tank. It has been. Accordingly, a swirling water flow can be generated between the first water channel and the second water channel, and between the third water channel and the fourth water channel, and oxygen in the air is sufficiently taken into the water to be treated. Thus, the oxygen supply amount can be increased. At this time, since the air diffuser is provided at the center in the depth direction of each water channel, the increase in the load on the blower is suppressed as compared with the case where the air diffuser is provided at the bottom of the aeration tank. Can do.

  The aeration facility has a central portion in the other depth direction different from the one of the first and second water channels, and a central portion in the other depth direction different from the one of the third and fourth water channels, respectively. It is good also as providing the other air diffusing device with which the air diffusing amount is smaller than the said air diffusing device. In this way, it is possible to further increase the oxygen supply amount.

  ADVANTAGE OF THE INVENTION According to this invention, the aeration equipment which can aim at the increase in the oxygen supply amount to to-be-processed water is suppressed, suppressing the increase in the load to a blower.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted.
(First embodiment)
FIG. 1 is a front sectional view showing the configuration of the aeration equipment according to this embodiment. 2 is a cross-sectional view taken along the line II-II shown in FIG. As shown in FIGS. 1 and 2, the aeration equipment 10 includes an aeration tank 12, two partition walls 14, and an air diffuser 16.

  The aeration tank 12 has a bottom wall portion 12a, opposed left and right side wall portions 12b and 12c, and opposed front and rear side wall portions 12d and 12e. The two partition walls 14 are horizontally mounted between the front and rear side wall portions 12d and 12e of the aeration tank 12, and are parallel to the left and right side wall portions 12b and 12c from a height position separated from the bottom surface of the aeration tank 12 by a predetermined gap. So as to stand vertically. Thereby, the aeration tank 12 is divided into the three water channels of the 1st to 3rd water channels 18, 20, and 22 in order in the arrangement direction.

The air diffuser 16 is provided at the center of the first and third water channels 18 and 22 in the depth direction. Here, the central portion, when the depth of the aeration tank 12 was set to D _w, refers to the depth portion of the 1 / 3-2 / 3. Therefore, when considering a deep tank aeration tank having a depth of about 10 m, the air diffuser 16 is preferably provided at a depth of 4 m to 6 m from the water surface. If the diffuser 16 is provided at a position shallower than 4 m from the water surface, the contact time with the diffused air is shortened, and the swirling water flow tends not to occur. Moreover, when the diffuser 16 is provided at a position deeper than 6 m from the water surface, the load on the blower 24 tends to increase. The depth position of the air diffuser 16 is considered based on the air diffused surface from which bubbles are released.

  The air diffuser 16 has a plurality of air diffuser units 26 as shown in FIG. In the present embodiment, the air diffuser 16 has three air diffuser units 26. As shown in FIG. 3, the air diffuser unit 26 is configured by unitizing a plurality of air diffusers 28. In the present embodiment, the diffused gas unit 26 is configured by unitizing four diffused gases 28. As shown in FIG. 4, the diffused gas 28 includes a casing 30 and a porous body 32 such as a porous ceramic or a resin porous membrane. In this diffused gas 28, a porous body 32 is placed on the housing 30, and through a hole 34 drilled in the bottom wall portion of the housing 30 in a space S formed between the housing 30 and the porous body 32. By supplying air, air is diffused through the porous body 32. The upper surface of the porous body 32 constitutes a diffuser surface.

  As shown in FIG. 3, the plurality of diffused gases 28 having such a configuration are attached to a header pipe 36 that distributes air and further supported by a support pole 38 to be unitized. The header pipe 36 is connected to the blower 24 outside the aeration tank 12 through an air supply line La. The air diffusing device 16 is configured by providing a plurality of such air diffusing units 26. The configuration of the air diffuser 16 is not limited to the configuration described above, and any other configuration can be used as long as it can diffuse fine bubbles in the water to be treated. Also good.

  Here, in the present embodiment, the three air diffuser units 26 of the air diffuser 16 provided in the first water channel 18 are installed at the same depth position, and the discharge pressure may be the same. It is common. Further, the three air diffusion units 26 of the air diffuser 16 provided in the third water channel 22 are respectively installed at the same depth position, and the discharge pressure may be the same, so the blower 24 is shared. Further, since the air diffuser 16 provided in the first water channel 18 and the air diffuser 16 provided in the third water channel 22 are respectively installed at the same depth position, the discharge pressure may be the same. The blower 24 is shared between the two. In this way, the configuration is simplified. However, the blower may be divided in each of the first water channel 18 and the third water channel 22, and further, the blower may be divided in each air diffuser unit 26.

  A plurality of rectifying plates 40 are provided in the second water channel 20 surrounded by the two partition walls 14 so as to extend along the vertical direction. These rectifying plates 40 are provided at right angles to the partition wall 14.

  Next, the operation and effect of the aeration equipment 10 described above will be described.

  First, as shown in FIG. 1, water to be treated is stored in the aeration tank 12. At this time, the water surface is above the upper end of the partition wall 14. Then, the blower 24 is operated to supply air from the air supply line La toward the air diffuser 16. Then, fine bubbles are diffused from the diffused gas 28 into the water to be treated, and a rising water flow is generated in the first and third water channels 18 and 22. Then, the rising water flow generated in the first water channel 18 flows into the second water channel 20, and the swirling water flow between the first water channel 18 and the second water channel 20 as indicated by an arrow α in FIG. 1. Occurs. On the other hand, the ascending water flow generated in the third water channel 22 flows into the second water channel 20, and the swirling water flow between the third water channel 22 and the second water channel 20 as shown by the arrow β in FIG. Occurs. As a result, oxygen in the air is sufficiently taken into the water to be treated, and the oxygen supply amount is increased. At this time, since the air diffuser 16 is provided at the center in the depth direction of each of the water channels 18, 22, compared with the case where the air diffuser 16 is provided at the bottom of the aeration tank 12, An increase in load can be suppressed.

  Further, since the rectifying plate 40 is provided in the second water channel 20, the possibility of the turbulent flow of the swirling water flow is reduced, and the oxygen dissolution efficiency can be improved.

  In addition, in the aeration equipment 10 demonstrated with reference to FIG.1 and FIG.2, the case where the two partition walls 14 are arrange | positioned with sufficient balance, and the 1st and 3rd water channels 18 and 22 have the width | variety comparable was demonstrated. However, the widths of the first and third water channels 18 and 22 may be different as shown in FIG. In the aeration equipment 10 shown in FIG. 5, one partition wall 14 is provided at the center in the width direction of the aeration tank 12, and the other partition wall 14 is provided at a position offset on the right side wall 12 c side. Even if it does in this way, there can exist the same effect as the aeration equipment 10 shown in the said FIG.1 and FIG.2. In particular, the existing aeration equipment is often of a two-water channel type in which a partition wall is provided at the center in the width direction of the aeration tank. In this case, another partition wall 14 is provided to form three water channels, By installing the air diffuser 16 in the third water channels 18 and 22, the air diffuser 10 according to the present embodiment can be easily configured by effectively utilizing existing facilities.

  FIG. 6 is a plan view showing the configuration of the wastewater treatment facility 50 including the aeration facility 10 described above. As shown in FIG. 6, the wastewater treatment facility 50 includes an initial settling tank 52, the above-described aeration facility 10, and a post-settling tank 54 in order from the previous stage. Drainage pumped up by a pump P is sent to the initial settling tank 52 from a preceding settling basin (not shown). In the initial settling tank 52, the waste water is retained for about 2 to 3 hours, and fine sludge that has not been sunk in the sand basin is submerged in the bottom. The sludge accumulated on the bottom is scraped by a scraping device (not shown), collected in the pit 53 and pulled out, and then sent to a sludge treatment facility (not shown).

  The waste water staying in the initial settling tank 52 is sent to the aeration equipment 10. The arrangement direction of the first to third water channels 18, 20, and 22 of the aeration equipment 10 is orthogonal to the arrangement direction of the initial settling tank 52, the aeration equipment 10, and the post-settling tank 54. A trough 56 is provided between the initial settling tank 52 and the aeration equipment 10, and waste water overflowing the trough 56 is sent to the aeration equipment 10. In the aeration facility 10, activated sludge is added to the aeration tank 12, and the wastewater is stirred for about 6 to 8 hours while being diffused by the air diffuser 16. Thereby, the dirt in waste water is decomposed. Then, the treated water is sent to the subsequent post-sink tank 54. A trough 58 is provided between the aeration equipment 10 and the post-sink tank 54, and treated water overflowing this is sent to the post-sink tank 54.

In the post-sink tank 54, treated water is retained for about 3 to 4 hours, and a lump of sludge generated in the aeration facility 10 is submerged in the bottom. The sludge accumulated on the bottom is scraped by a scraping device (not shown), collected in the pit 55 and pulled out, and then sent to a sludge treatment facility (not shown). The clear treated water of the supernatant is sterilized with chlorine if necessary and sent to an advanced treatment facility and then discharged out of the system such as a river.
(Second Embodiment)
Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the same element as above-mentioned 1st Embodiment, and the overlapping description is abbreviate | omitted.

  FIG. 7 is a front sectional view showing the configuration of the aeration equipment according to the second embodiment. As shown in FIG. 7, the aeration facility 60 includes an aeration tank 12, three partition walls 14, and an air diffuser 16.

  The aeration tank 12 has a bottom wall portion 12a, opposed left and right side wall portions 12b and 12c, and opposed front and rear side wall portions (not shown), as described in the first embodiment. The three partition walls 14 are horizontally mounted between the front and rear side wall portions of the aeration tank 12, and are vertically arranged so as to be parallel to the left and right side wall portions 12b and 12c from a height position separated from the bottom surface of the aeration tank 12. Standing in the direction. Thereby, the aeration tank 12 is divided into four water channels of first to fourth water channels 62, 64, 66, and 68 in order in the arrangement direction. Of the three partition walls 14, the middle partition wall 14 has an upper end position higher than the upper end positions of the other two partition walls 14 and a lower end position that is lower than the lower end positions of the other two partition walls 14. Is also low.

  The air diffuser 16 is provided in the center part in the depth direction of the second and third water channels 64 and 66, respectively. The air diffuser 16 is the same as that described in the first embodiment.

  Next, the operation and effect of the aeration equipment 60 described above will be described.

  First, as shown in FIG. 7, the water to be treated is stored in the aeration tank 12. At this time, the water surface is above the upper end of the partition wall 14. Then, the blower 24 is operated to supply air from the air supply line La toward the air diffuser 16. Then, fine bubbles are diffused from the diffused gas 28 into the water to be treated, and a rising water flow is generated in the second and third water channels 64 and 66. Then, the ascending water flow generated in the second water channel 64 flows into the first water channel 62, and the swirling water flow between the second water channel 64 and the first water channel 62 as shown by the arrow α in FIG. Occurs. On the other hand, the ascending water flow generated in the third water channel 66 flows into the fourth water channel 68, and the swirling water flow between the third water channel 66 and the fourth water channel 68 as shown by the arrow β in FIG. Occurs. As a result, oxygen in the air is sufficiently taken into the water to be treated, and the oxygen supply amount is increased. At this time, since the air diffuser 16 is provided at the center in the depth direction of each water channel, the load on the blower 24 is increased as compared with the case where the air diffuser 16 is provided at the bottom of the aeration tank 12. Can be suppressed. Note that the middle partition wall 14 has an upper end position higher than the upper end positions of the other two partition walls 14 and a lower end position lower than the lower end positions of the other two partition walls 14. The swirling water flow swirling through the first and second water channels 62 and 64 and the swirling water flow swirling through the third and fourth water channels 66 and 68 can be suitably separated, and the occurrence of turbulent flow is reduced, so that The oxygen dissolution efficiency is improved.

Here, as described above, many existing aeration equipments are of the two-water channel type in which a partition wall is provided at the center in the width direction of the aeration tank. Therefore, in this case, the two partition walls 14 are provided to form four water channels, and the air diffuser 16 is installed in the second and third water channels 64 and 66, so that the existing equipment can be used effectively and this embodiment can be used. The air diffusion facility 60 according to the above can be easily configured. At this time, the intermediate partition wall 14 is made of concrete or the like, whereas the remaining two partition walls 14 are preferably made of synthetic wood or the like because they are easy to form.
(Third embodiment)
Next, a third embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the element same as the above-mentioned 1st and 2nd embodiment, and the overlapping description is abbreviate | omitted.

  FIG. 8 is a front sectional view showing the configuration of the aeration equipment according to the third embodiment. As shown in FIG. 8, the aeration facility 70 according to the present embodiment has the aeration facility according to the second embodiment except that an aeration device 72 is newly installed in the first and fourth water channels 62 and 68. The configuration is the same as 60.

  The new air diffuser 72 is provided in the center part in the depth direction of the 1st and 4th water channels 62 and 68, respectively. The amount of air diffused by the new air diffuser 72 is smaller than the amount of air diffused by the air diffuser 16 installed in the second and third water channels 64 and 66. The amount of air diffused by the air diffuser 72 is adjusted by changing the area of the air diffuser and the air volume. The air diffusers 72 provided in the first to fourth water passages 62, 64, 66, and 68 are installed at the same depth position, and the discharge pressure may be the same. Is common. In this way, the configuration is simplified. However, the blower may be divided in each of the first to fourth water channels 62, 64, 66 and 68.

  Next, the operation and effect of the aeration equipment 70 described above will be described.

  First, as shown in FIG. 8, the water to be treated is stored in the aeration tank 12. At this time, the water surface is above the upper end of the partition wall 14. Then, the blower 24 is operated to supply air from the air supply line La toward the air diffuser 16. Then, fine bubbles are diffused from the diffused gas 28 into the water to be treated, and a rising water flow is generated in the second and third water channels 64 and 66. Then, the rising water flow generated in the second water channel 64 flows into the first water channel 62, and the swirling water flow between the second water channel 64 and the first water channel 62 as shown by an arrow α in FIG. Occurs. On the other hand, the ascending water flow generated in the third water channel 66 flows into the fourth water channel 68, and the swirling water flow between the third water channel 66 and the fourth water channel 68 as shown by the arrow β in FIG. Occurs.

  When this swirling water flow is in a steady state, the valve 74 is opened and a small volume of air is diffused into the water to be treated by the air diffuser 72. A small volume of air from the air diffuser 72 is pulled by the swirling water flow that is in a steady state, descends the first and fourth water channels 62 and 68, and passes through the second and third water channels 64 and 66. Ride the rising swirling water stream. As a result, the air volume is increased, and the amount of oxygen supplied to the water to be treated is further increased. At this time, since the air diffuser 72 is provided at the center of each of the water channels 62 and 68 in the depth direction, the load on the blower 24 is compared with the case where the air diffuser is provided at the bottom of the aeration tank 12. Can be suppressed.

  The present invention is not limited to the above-described embodiment, and various modifications can be made. For example, the wastewater treatment facility 50 described in the first embodiment may include the aeration facility 60 described in the second embodiment or the aeration facility 70 described in the third embodiment.

  Moreover, in the aeration equipment 60 according to the second embodiment, a current plate may be provided in the first and fourth water channels 62 and 68 where the air diffuser 16 is not provided.

  In the aeration equipment 60 according to the second embodiment, the air diffuser 16 is provided in the second and third water channels 64 and 66, but the air diffuser 16 is disposed in the first and third water channels 64 and 66. The air diffuser 16 may be provided in the first and fourth water channels 62 and 68, and the air diffuser 16 may be provided in the second and fourth water channels 64 and 68. In accordance with this, in the aeration equipment 70 according to the third embodiment, a new aeration device 72 with a small amount of aeration may be installed in a water channel where the aeration device 16 is not provided.

It is a front sectional view showing the configuration of the aeration equipment according to the first embodiment. It is sectional drawing in the II-II line shown in FIG. It is a top view which shows the structure of the air diffusion unit which comprises an air diffuser. It is sectional drawing which shows the structure of the diffused gas which comprises a diffused gas unit. It is a front sectional view showing a modification of the aeration equipment according to the first embodiment. It is a top view which shows the structure of the waste water treatment facility provided with the aeration equipment which concerns on 1st Embodiment. It is a front sectional view showing the configuration of the aeration equipment according to the second embodiment. It is a front sectional view showing the configuration of the aeration equipment according to the third embodiment.

Explanation of symbols

  10, 60, 70 ... aeration equipment, 12 ... aeration tank, 14 ... partition wall, 16, 72 ... diffuser, 18, 62 ... first water channel, 20, 64 ... second water channel, 22, 66 ... first 3 water channels, 40 ... current plate, 68 ... fourth water channel.

Claims (5)

An aeration tank for storing treated water;
Two partition walls standing vertically from a height position spaced apart from the bottom surface of the aeration tank, and dividing the aeration tank into three water channels of first to third water channels in order in the arrangement direction; ,
An air diffuser provided in the center of each of the first and third water channels in the depth direction;
An aeration facility characterized by comprising:   The aeration equipment according to claim 1, further comprising a baffle plate provided so as to extend in a vertical direction in the second water channel.   The aeration apparatus according to claim 1, wherein the air diffuser is provided at a depth of 4 to 6 m from the water surface. An aeration tank for storing treated water;
Three partition walls that are erected in a vertical direction from a height position that is separated from the bottom surface of the aeration tank by a predetermined distance, and that divides the aeration tank into four water channels of a first to a fourth water channel in the arrangement direction; ,
An air diffuser provided at a central portion in the depth direction of any one of the first and second water channels, and a central portion in the depth direction of any one of the third and fourth water channels,
An aeration facility characterized by comprising:   The first and second water channels are respectively provided in a central portion in the other depth direction different from the one and in the other central portion in the other depth direction different from the one of the third and fourth water channels. The aeration apparatus according to claim 4, further comprising another aeration device having a smaller amount of aeration than the aeration device.

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