JP3210936U - Wastewater treatment equipment - Google Patents

Abstract

Provided is a wastewater treatment apparatus capable of efficiently separating and recovering oil from wastewater without using a large water tank and simultaneously purifying the wastewater itself. A waste water treatment apparatus according to the present invention includes a water tank 1 in which an interior is partitioned by a partition unit 7a, and a supply pipe 2a and a suction pipe 2b are connected to a supply port 1a and a discharge port 1b provided in a side plate 1c, A flow meter 3 provided in the supply pipe 2a, a bubble generating means 4 that generates fine bubbles and is connected to the water tank 1 through the supply pipe 2a, and ozone is supplied to the bubble generating means 4 through the gas supply pipe 2c. An ozone generator 5 to be supplied; a pump 6a connected to the discharge port 1b via the suction pipe 2b; and connected to the bubble generating means 4 via the discharge pipe 2d; and an injection pipe 2e for injecting waste water into the water tank 1. The pump 6b to which the injection pipe 2e is connected, the pumping pipe 2f for pumping out the treated waste water, and the pump 6c connected to the pumping pipe 2f are provided. [Selection] Figure 1

Description

  The present invention relates to a device for treating wastewater generated in facilities such as factories, and in particular, a wastewater treatment device capable of efficiently separating oil and purifying wastewater in a water tank by injecting fine bubbles. About.

Conventionally, wastewater generated when washing soil contaminated with oil has been treated by a method using a coagulating precipitant, filtration, or the like. However, these methods not only require time for processing, but also have a problem that waste generated in the processing step must be processed in another step.
In order to solve such problems, there is a technology that separates the oil layer from the water layer by injecting fine bubbles into the waste water contaminated with oil, attaching oil droplets to the surface of the bubbles and floating together with the bubbles. Attention has been paid.

In this regard, for example, Patent Document 1 discloses an invention relating to a method and apparatus for separating oil contained in an emulsion state in water using bubbles under the name of “oil-water separation method and apparatus”. Yes.
The “oil-water separation method” according to the invention disclosed in Patent Document 1 is characterized in that fine bubbles and coarse bubbles are jetted alternately or in parallel from the bottom of the separation tank into the oil-containing water.
According to such a method, the coarse bubbles having a high rising speed act so as to increase the rising speed of the agglomerates of fine bubbles to which the oil particles are adhered, so that the oil can be efficiently separated.

Patent Document 2 discloses an invention relating to an apparatus that floats and separates oil under the name of “oil-water separator” by oil adsorption and floating effect of fine bubbles.
The invention disclosed in Patent Document 2 is provided with a device for generating fine bubbles at the bottom of the previous stage and an ejection nozzle, and a floating oil recovery chamber in the rear stage partitioned from the previous stage by a partition plate, and the floating oil recovery chamber In addition, a waste water drainage chamber communicating at the bottom is installed, and an oil / water separation tank is further provided in which waste liquid of an arbitrary flow rate is sequentially fed by a quantitative water feeding means.
In the oil / water separator having such a structure, the fine bubbles floated up to the upper part of the partition plate by the forced flow by the quantitative water feeding means are brought into contact with the floating oil to increase the buoyancy. It becomes difficult to float. In the floating oil recovery chamber, the oil is separated and recovered due to the difference in specific gravity, and the waste liquid is drained from the waste liquid drain chamber. Therefore, it can be separated and recovered without leaving floating oil.

Japanese Patent Laid-Open No. 7-289801 JP 2011-20025 JP

  In the invention disclosed in Patent Document 1, although the rising speed of the oil adsorbed on the surface of the bubbles can be controlled by changing the generation ratio of the fine bubbles and the coarse bubbles, the rising speed can be accurately adjusted. There was a difficult problem. Moreover, in order to lengthen the residence time of the oil-containing water in the separation tank, a deep separation tank has to be used, which causes a problem that the apparatus becomes large.

  In the invention disclosed in Patent Document 2, there is a problem that the oil separation efficiency from the oil mixed waste liquid cannot be increased because the structure in which the speed of the oil floating in the oil-water separation tank is not adjustable. . In addition, since the oil mixing waste liquid stays in the inside depending on the depth of the oil / water separation tank, the oil may not be sufficiently separated from the oil mixing waste liquid when a small oil / water separation tank is used. there were.

  The present invention has been made in response to such problems of the prior art, and can efficiently separate and recover oil from wastewater without using a large tank, and simultaneously purify the wastewater itself. An object of the present invention is to provide a wastewater treatment apparatus capable of performing the above.

In order to achieve the above object, the first device is a water tank in which a supply port and a discharge port of water to be treated are provided in the lower part and the longitudinal direction thereof is parallel to the vertical direction, and a diameter of 10 ⁻ Bubble generating means for generating fine bubbles of ³ to 10 ⁻⁹ m and supplying the bubbles together with the water to be treated into the water tank from the supply port through the supply pipe, and the bubble generation means via the gas supply pipe Connected gas supply means, a pump connected to the discharge port via the suction pipe and supplying the water to be treated to the bubble generation means via the discharge pipe, and a plurality of pieces installed detachably in the water tank And a partition unit that partitions the inside thereof to form a plurality of spaces.
In the present specification, “parallel” is a concept including not only a completely parallel state but also a “substantially parallel” state. In addition, “removably installed inside the aquarium” means that it is installed so that it can be easily removed without being joined to the aquarium, or is fixed using bolts and nuts, etc. Means that it is installed so that it can be easily removed from the aquarium.

In the wastewater treatment apparatus having such a structure, when the pump is operated in a state where the water to be treated is stored in the water tank, the water to be treated sucked into the pump from the water tank through the suction pipe passes through the discharge pipe to the bubble generating means. After being supplied, the fine bubbles made of the desired gas generated by the bubble generating means are returned to the water tank again through the supply pipe. And in a water tank, the oil component contained in to-be-processed water is adsorb | sucked on the surface of a fine bubble, and it has the effect | action that an oil layer is formed in the upper part of a water tank by the bubble rising.
In addition, when an ozone generator is used as a gas supply means, in addition to the decomposition | disassembly effect | action of the organic substance by the shock wave produced in the crushing process of the fine bubble which consists of ozone gas, the bactericidal action and oxidation action by ozone are exhibited.
Furthermore, since the to-be-processed water is induced | guided | derived to the predetermined direction by the several partition plate which comprises a partition unit, it has the effect | action that the residence time of the to-be-processed water in a water tank becomes long.

Further, the second device is the lower surface of the first device according to the first device, so that the first space and the second space are formed so as to partition the inside of the water tank and communicate with the supply port and the discharge port, respectively. Partitioning the first space and the second space with a first partition plate installed in parallel with the vertical direction in a state of being in contact with the bottom plate of the aquarium and shorter than the first partition plate The second partition plate and the third partition plate alternately arranged in a state of being parallel to each other at a desired interval, and the first partition plate has its upper end or its A first flow path of water to be treated is provided in the vicinity of the lower end, and the second partition plate is disposed on both surfaces of the first partition plate so that the lower end is flush with the lower end of the first partition plate. The third partition plate is erected on both surfaces of the first partition plate so that the upper end of the third partition plate is flush with the upper end of the first partition plate. It is characterized in that it has been respectively erected.
In the specification of the present application, “level” means not only a state in which the heights of the end portions of the two members are exactly the same so that no step is generated, but also the heights of the end portions of the two members. It is a concept that includes a “substantially flush” state in which the two substantially match.
In the wastewater treatment apparatus having such a structure, the water to be treated moves along the inside of the first space and the second space over time while repeating rising and lowering along with fine bubbles made of a desired gas. Thus, the effect of the first device that the oil contained in the water to be treated is adsorbed on the surface of fine bubbles is further exhibited.

A third device is characterized in that, in the first device or the second device, an oxygen generator is installed as a gas supply means.
In the wastewater treatment apparatus having such a structure, in addition to the operation of the first device or the second device, fine bubbles made of oxygen gas are generated by the bubble generating means, and the fine bubbles are combined with the water to be treated. It has the effect of being supplied to the water tank.

A fourth device is characterized in that, in the second device, the partition unit is installed so that the second partition plate and the third partition plate are inclined with respect to the vertical direction. is there.
In the wastewater treatment apparatus having such a structure, in addition to the operation of the second device, bubbles rising in the water tank come into contact with the second partition plate or the third partition plate, and other bubbles are formed on their surfaces. Overlapping and growing large, as a result, it has the effect that the rising speed of the bubbles increases.

The fifth device is the first device in which the water tank has a rectangular parallelepiped shape, a supply port and a discharge port are provided at the lower part of the pair of first side plates parallel to each other, and the flat plate has a rectangular shape, The connecting plate having the same width as the distance between the pair of second side plates not provided with the supply port and the discharge port, the third partition plate, and the fourth partition plate, The fourth partition plate is joined to the connection plate at one end in a state where the fourth partition plates are alternately arranged at a desired interval so as to be parallel to each other, and the third partition plate is connected to the connection plate. A second flow path of the water to be treated is provided in the vicinity of the end portion on the non-joined side, and the fourth partition plate has a third flow of the water to be treated in the vicinity of the end portion joined to the connecting plate. A road is provided.
In the present specification, “same” is a concept including not only completely “same” state but also “substantially identical” state, and “rectangular shape” and “cuboid” are “substantially rectangular” It is a concept including a state of “substantially rectangular parallelepiped”.

  In the wastewater treatment apparatus having such a structure, in addition to the operation of the first device, the partition unit is installed in the water tank so that the third partition plate and the fourth partition plate are parallel to the vertical direction, When the pump is operated in a state where the water to be treated is stored in the water tank, the water to be treated moves in the water tank over time while repeating rising and lowering along with fine bubbles made of a desired gas. Moreover, when the attitude | position of the partition unit installed in a water tank is changed, it has the effect | action that the inclination angle of the 3rd partition plate with respect to a perpendicular direction and a 4th partition plate changes. In addition, the partition unit is installed so that the end of the third partition plate and the fourth partition plate that is not joined to the connection plate of the third partition plate contacts the first side plate provided with the supply port. When the pump is operated in a state where the interior is filled with the water to be treated, the water to be treated moves along the third partition plate and the fourth partition plate along with the fine bubbles in the water tank to the left and right. It has the effect of rising through the path and the third flow path.

The sixth device is characterized in that, in any one of the first device to the fifth device, an upper part of the water tank is open, and a lid is detachably attached so as to close the upper part. To do.
In the wastewater treatment apparatus having such a structure, in addition to the action of any one of the first to fifth inventions, drainage can be easily supplied and pumped by removing the lid and opening the upper part of the water tank. In addition, when the upper part of the water tank is closed by the lid, there is an effect that the desired gas supplied to the water tank as fine bubbles is prevented from being diffused into the atmosphere from the upper part of the water tank.

  As described above, according to the first device, recovery of the oil contained in the water to be treated and purification of the water to be treated can be performed at the same time. And if the several partition unit from which the inclination angle of the partition plate with respect to a perpendicular direction differs is prepared previously, adjustment of the residence time of the to-be-processed water in a water tank will be attained by replacing | exchanging them suitably. Therefore, according to the present invention, it is possible to efficiently recover the above-described oil component. Furthermore, in the present invention, when there is a large amount of wastewater to be treated, a plurality of water tanks are prepared and each supply port and discharge port are connected by piping so that it can be easily handled. There is also an advantage that it is not necessary to use.

  In the second device, the oil is easily adsorbed on the surface of the fine bubbles, and the time required for separating the oil from the water to be treated is shortened. Therefore, the oil can be collected more efficiently. .

  According to the third device, in addition to the effects of the first device or the second device, there is an effect that the concentration of oxygen dissolved in the water to be treated can be efficiently increased.

  According to the fourth device, in addition to the effect of the second device, there is an effect that the recovery rate of oil can be increased by adjusting the rising speed of the bubbles.

  According to the fifth device, since it is easy to change the inclination angle of the third partition plate and the fourth partition plate with respect to the vertical direction, in addition to the effect of the first device, oil is adsorbed on the surface. There is an effect that it is possible to increase the recovery efficiency of the oil by adjusting the rising speed of the fine bubbles. In addition, when the partition unit is installed in the water tank so that the end of the side that is not joined to the connecting plate of the third partition plate and the fourth partition plate contacts the side plate provided with the supply port Because the time for which the water to be treated stays in the water tank becomes much longer, instead of the ozone generator, the oxygen generator is connected to the bubble generating means, and the fine bubbles made of oxygen gas together with the water to be treated If it supplies to a water tank, the density | concentration of the oxygen which melt | dissolves in to-be-processed water can be raised efficiently.

  According to the sixth invention, in addition to the effects of any one of the first to fifth inventions, there is an effect that it is possible to safely and efficiently perform the oil separation work from the waste water.

(A) is a block diagram of Example 1 of the waste water treatment apparatus which concerns on embodiment of this invention, (b) is an external appearance perspective view of a water tank. (A) And (b) is the top view of the water tank of Example 1, and the external appearance perspective view of a partition unit, respectively. (A) thru | or (c) are the AA arrow directional cross-sectional view in FIG. (A) is the external appearance perspective view which showed the 1st modification of the partition unit of FIG.2 (b), (b) and (c) are corresponded to Fig.3 (a) and FIG.3 (c), respectively. FIG. (A) is the external appearance perspective view which showed the 2nd modification of the partition unit of FIG.2 (b), (b) and (c) are corresponded to Fig.3 (a) and FIG.3 (c), respectively. FIG. (A) And (b) is an external appearance perspective view of the water tank which comprises Example 2 of the waste water treatment equipment concerning an embodiment of the invention. (A) is an external appearance perspective view of the partition unit and spacer of Example 2, (b) is an external perspective view of a spacer. (A) And (b) is DD sectional view taken on the line in FIG.6 (b).

The waste water treatment device of the present invention supplies fine bubbles (fine bubbles) having a diameter of 10 ⁻³ to 10 ⁻⁹ m from below the water tank in which the waste water is stored, thereby removing oil contained in the waste water. By adhering to the surface and floating together with bubbles, the oil is separated and recovered to purify the drainage.
The specific structure and the action and effect based on the specific structure will be specifically described with reference to FIGS. In order to clarify that “drainage” is not used in the meaning of “water discharged from the aquarium”, in the following description, “drainage” in the state of the tank is referred to as “covered”. It shall be written as “treated water”.

Fig.1 (a) is the block diagram which showed an example of the waste water treatment apparatus of this invention, FIG.1 (b) is the perspective view which showed the external appearance of the water tank. Moreover, Fig.2 (a) is the figure which looked at the water tank from upper direction, FIG.2 (b) is the perspective view which showed the external appearance of the partition unit installed in the inside of a water tank. 3A to 3C are a cross-sectional view taken along line AA, a cross-sectional view taken along line BB, and a cross-sectional view taken along line CC in FIG. 2A, respectively.
In addition, as shown in FIG.1 (b), although the supply port 1a and the discharge port 1b of the water tank 1 are provided in the same height, in order to make a figure legible in Fig.1 (a), the supply port 1a. The supply pipe 2a and the suction pipe 2b connected to the discharge port 1b are shifted in height.

As shown in FIGS. 1 (a) and 1 (b), the wastewater treatment apparatus of the present invention has a substantially rectangular parallelepiped shape with the upper part opened, the interior is partitioned by the partition unit 7a, and the side plate near the bottom plate 1f. A supply pipe 2a and a suction pipe 2b are connected to a supply port 1a and a discharge port 1b provided in 1c, respectively, and a water tank 1 installed so that its longitudinal direction is parallel to the vertical direction, and a supply pipe 2a. The flow meter 3, the bubble generating means 4 that generates fine bubbles (fine bubbles) having a diameter of 10 ⁻³ to 10 ⁻⁹ m, and is connected to the water tank 1 via the supply pipe 2 a, and the bubble generation An ozone generator 5 for supplying ozone to the means 4 via the gas supply pipe 2c, and a pump 6a connected to the discharge port 1b via the suction pipe 2b and connected to the bubble generation means 4 via the discharge pipe 2d. It has.
In addition, the water tank 1 is filled with an injection pipe 2e for injecting waste water as indicated by solid arrows, a pump 6b to which the injection pipe 2e is connected, and treated waste water as indicated by broken arrows. A pumping pipe 2f for pumping out and a pump 6c connected to the pumping pipe 2f are installed.

As the bubble generating means 4, an apparatus having a known structure such as an ejector method, a pressure dissolution method, a swirl flow method, a venturi method, a cavitation method, or the like can be used.
Further, in this embodiment, the partition unit 7a is not joined to the water tank 1, and can be taken out from the inside of the water tank 1 as necessary. The unit 7a may have a structure fixed to the water tank 1 using bolts or nuts.
Furthermore, in this embodiment, the water tank 1 is formed using acrylic resin, polypropylene resin, vinyl chloride resin, fiber reinforced resin, or the like. However, the water tank 1 is not limited to this, and the water tank 1 is made of metal such as stainless steel or aluminum. It may be.

  As shown in FIG. 2A or FIG. 2B, the partition unit 7a is composed of partition plates 8a to 8d having a rectangular flat plate shape. And the partition plate 8a partitions the inside of the water tank 1 substantially equally, and forms two space 1d, 1e (refer FIG.1 (b) or FIG.2 (a)) each connected to the supply port 1a and the discharge port 1b. As shown in FIG. 3, the lower end 13a is placed in parallel with the vertical direction in contact with the bottom plate 1f, and an L-shaped notch 9a (see FIG. 3A) is formed at one corner of the lower end 13a. ) Is formed.

  The partition plates 8b to 8d have substantially the same shape, but the partition plate 8b is arranged at the approximate center in the width direction of the partition plate 8a so that the upper end 13f thereof is substantially flush with the upper end 13e of the partition plate 8a. The partition plates 8c and 8d are arranged symmetrically with respect to the partition plate 8b so that their lower ends 13c and 13d are substantially flush with the lower end 13a of the partition plate 8a.

  In the wastewater treatment apparatus having the above structure, the pump 6b injects wastewater from the injection pipe 2e into the water tank 1 and fills the interior with the wastewater within the range not exceeding the upper ends 13g and 13h of the partition plates 8c and 8d. , The waste water stored in the water tank 1 (hereinafter referred to as “water to be treated”) is sucked into the pump 6a through the suction pipe 2b and then supplied to the bubble generating means 4 through the discharge pipe 2d. Is done. And this to-be-processed water is returned to the water tank 1 again through the supply pipe | tube 2a with the fine bubble which consists of ozone gas produced | generated by the bubble generation means 4 and the ozone generator 5. FIG.

  The water to be treated supplied from the supply port 1a to the space 1d of the water tank 1 rises along the partition plate 8d together with the fine bubbles made of ozone gas, as indicated by the solid line arrow in FIG. After getting over the upper end 13h (see FIG. 2B) of the plate 8d, it descends along the partition plate 8b and passes through the gap between the lower end 13b of the partition plate 8b (see FIG. 2B) and the bottom plate 1f. Then, the water to be treated and the fine bubbles rise along the partition plate 8c, get over the upper end 13g (see 2 (b)) of the partition plate 8c, and then descend, and a dashed arrow in FIG. 3 (b). As shown in FIG. 6, the space moves to the inside of the space 1e through the notch 9a of the partition plate 8a. That is, the notch 9a of the partition plate 8a has a function as a flow path for water to be treated and fine bubbles.

  The water to be treated that moved along with the fine bubbles made of ozone gas through the notch 9a of the partition plate 8a into the space 1e rises along the partition plate 8c as shown by the solid line arrow in FIG. After getting over the upper end 13g of the partition plate 8c (see FIG. 2B), it descends along the partition plate 8b and passes through the gap between the lower end 13b of the partition plate 8b (see FIG. 2B) and the bottom plate 1f. To do. Then, the water to be treated and the fine bubbles rise along the partition plate 8d, go over the upper end 13h (see 2 (b)) of the partition plate 8d, and then descend to the outside of the water tank 1 from the discharge port 1b. leak.

As described above, in the wastewater treatment apparatus of the present invention, the water to be treated moves with the fine bubbles made of ozone gas and moves up and down in the water tank 1 over time, and thus is included in the water to be treated. The effect that oil is adsorbed on the surface of fine bubbles is sufficiently exhibited. And since an oil layer is formed in the upper part of water tank 1 when some of these bubbles rise, recovery of oil becomes easy. In addition, in the wastewater treatment apparatus of the present invention, fine bubbles made of ozone gas are generated. Therefore, in addition to the decomposition action of organic substances due to the shock wave generated in the crushing process of the bubbles, the sterilization action and oxidation action by ozone are also demonstrated. Is done.
Therefore, according to the wastewater treatment apparatus of the present invention, it is possible to efficiently collect oil contained in the wastewater and purify the wastewater itself at the same time.

4A is an external perspective view showing a first modification of the partition unit 7a of FIG. 2B, and FIGS. 4B and 4C are FIGS. 3A and 3B, respectively. It is a figure corresponded to 3 (c).
As shown in FIG. 4A, when the partition unit 7b is installed inside the water tank 1 so that the entire lower end 13a of the partition plate 8a contacts the bottom plate 1f in the partition unit 7a, the partition plates 8b to 8d. However, it has the structure installed in the both surfaces of the partition plate 8a so that it may be in the state inclined with respect to the perpendicular direction.

When the pump 6a is operated after the inside of the water tank 1 in which the partition unit 7b is installed instead of the partition unit 7a is filled with drainage, the state in which the partition unit 7a is installed is shown in FIGS. 3 (a) to 3 (c). As in the case described with reference to FIG. 4, the water to be treated supplied from the supply port 1 a to the water tank 1 is divided into the partition plates 8 b to 8 b as shown by solid arrows in FIG. 4 (b) or 4 (c). While moving up and down along 8d, the inside of the water tank 1 is moved over time with fine bubbles made of ozone gas.
At this time, since the partition plates 8b to 8d are inclined with respect to the vertical direction, the rising bubbles come into contact with the partition plates 8b to 8d, and grow on the surface overlapping with other bubbles. easy. In this manner, the bubbles that have become larger reach the upper part of the water tank 1 in a short time because the rising speed increases. However, when the inclination angle of the partition plates 8b to 8d with respect to the vertical direction is too large, the partition plates 8b to 8d may work so as to obstruct the rise of bubbles. It is desirable to set appropriately according to the purpose.
As described above, in the wastewater treatment apparatus of the present invention, by using the partition unit 7b instead of the partition unit 7a, it is possible to adjust the rising speed of the bubbles and increase the oil recovery efficiency.

FIG. 5A is an external perspective view showing a second modification of the partition unit 7a of FIG. 2B, and FIGS. 5B and 5C are FIGS. 3A and 3B, respectively. It is a figure corresponded to 3 (c).
As shown in FIG. 5A, the partition unit 7c includes three partition plates 8e and two partition plates 8f having substantially the same shape in the partition unit 7a instead of the partition plates 8b to 8d. The plate 8a is installed on both surfaces so as to be orthogonal to the longitudinal direction, and an L-shaped notch 9b is formed at one corner of the upper end 13e instead of the notch 9a with respect to the partition plate 8a. It has a structured. The partition plate 8e is disposed so that its end portion 14a is substantially flush with the end portion 15a of the partition plate 8a, and the partition plate 8f has its end portion 14b substantially flush with the end portion 15b of the partition plate 8a. It is arranged to be one.

When the pump 6a is operated after filling the inside of the water tank 1 in which the partition unit 7c is installed instead of the partition unit 7a with drainage, the water to be treated supplied from the supply port 1a to the water tank 1 is as shown in FIG. As shown by the solid line arrow, the inside of the space 1d rises while moving to the left and right along the partition plates 8e and 8f together with the fine bubbles, passes through the notch 9b of the partition plate 8a, and enters the interior of the space 1e. Moving. That is, the notch 9b of the partition plate 8a has a function as a flow path for water to be treated and fine bubbles.
And the to-be-processed water which moved with the fine bubble to the space 1e through the notch 9b of the partition plate 8a is left and right along the partition plates 8e and 8f as shown by the solid line arrows in FIG. It moves down to the inside of the space 1e while moving to and flows out of the water tank 1 from the discharge port 1b.

Thus, when the partition unit 7c is used instead of the partition unit 7a and the partition unit 7b, the time during which the water to be treated stays in the water tank 1 becomes longer than when the partition units 7a and 7b are used. Therefore, instead of the ozone generator 5, an oxygen generator (not shown) is connected to the bubble generating means 4, and the fine bubbles made of the oxygen gas generated by the bubble generating means 4 are mixed with the water to be treated in the water tank 1. If it is made to supply to, the density | concentration of the oxygen which melt | dissolves in to-be-processed water can be raised efficiently.
That is, in the waste water treatment apparatus of the present embodiment, the partition unit 7a is not joined to the water tank 1, and can be taken out as necessary, and the partition unit 7a can be easily replaced with the partition unit 7b or the partition unit 7c. It has become. Therefore, the wastewater treatment apparatus of the present invention can improve the efficiency of oil recovery and wastewater purification by adjusting the rising speed of fine bubbles and the time that the treated water stays in the water tank 1. It has the effect of.

FIG. 6 (a) is a perspective view showing the appearance of a water tank constituting Example 2 of the waste water treatment apparatus of the present invention, and FIG. 6 (b) shows a state where the lid is removed in FIG. 6 (a). It is a figure. FIG. 7A is a perspective view showing an appearance of the partition unit installed in the water tank shown in FIG. 6B, and FIG. 7B is shown in FIG. It is the perspective view which showed the whole spacer shape. Further, FIGS. 8A and 8B are cross-sectional views taken along line D-D in FIG. 6B.
In addition, FIG.8 (b) is corresponded in the figure which changed the installation state of the partition unit in Fig.8 (a). The components shown in FIGS. 1 to 5 are denoted by the same reference numerals, and the description thereof is omitted.

  The waste water treatment apparatus of the present embodiment has a substantially rectangular parallelepiped shape with the upper part opened as shown in FIGS. 6A and 6B instead of the water tank 1 in the waste water treatment apparatus of the first embodiment. The supply pipe 2a and the suction pipe 2b are respectively connected to the supply port 10a and the discharge port 10b provided in the vicinity of the bottom plate 10e with respect to the pair of side plates 10c and 10c that are partitioned inside by the partition unit 7d. The water tank 10 installed so that the longitudinal direction thereof is parallel to the vertical direction and the exhaust ports 11a and 11a are detachably attached to the water tank 10 so as to close the upper part of the water tank 10. The lid 11, the bubble generating means 4 connected to the water tank 10 via the supply pipe 2a, the ozone generator 5 for supplying ozone to the bubble generating means 4 via the gas supply pipe 2c, and the discharge port 10b Suck It has a structure in which a pump 6a which is connected to the air bubble generating means 4 through a discharge pipe 2d is connected through a tube 2b.

As shown in FIG. 7A, the partition unit 7d is substantially the same as the distance between the pair of side plates 10d and 10d (see FIG. 6B) where the supply port 10a and the discharge port 10b are not provided in the water tank 10. The rectangular flat plate-like partition plates 8g and 8h having a width of 5 mm and a connecting plate 8i.
There are five partition plates 8g and 8h in total, and one end portion is joined to the connecting plate 8i in a state where they are alternately arranged at a desired interval so as to be parallel to each other. The partition unit 7d is installed inside the water tank 10 so that all of the partition plates 8g and 8h and the connecting plate 8i are in a state of being orthogonal to the side plate 10d.

The partition plates 8g and 8h have substantially the same shape, but the partition plate 8g is provided with a concave notch 9c at a substantially center in the width direction with respect to an end portion that is not joined to the connecting plate 8i. The partition plate 8h is provided with a rectangular opening 9d substantially at the center in the width direction with respect to the end portion on the side joined to the connecting plate 8i.
In the waste water treatment apparatus of this embodiment, one end of the connecting plate 8i is placed on the spacer 12 (see FIG. 7B) so that the partition plates 8g and 8h are inclined with respect to the vertical direction. The connecting plate 8i is installed so as to be inclined with respect to the horizontal direction (see FIG. 7A). In addition, when the partition plates 8g and 8h and the connecting plate 8i are not orthogonal to each other, or when it is not necessary to install the partition plates 8g and 8h in a state inclined with respect to the vertical direction, the installation of the spacer 12 is omitted. May be.

  In the wastewater treatment apparatus having the above structure, when the pump 6b injects the wastewater from the injection pipe 2e into the water tank 10 and fills the interior with the wastewater within a range not reaching the notch 9c of the partition plate 8g, the pump 6a is operated. The water to be treated sucked into the pump 6a from the water tank 10 through the suction pipe 2b is supplied to the bubble generating means 4 through the discharge pipe 2d and then generated by the bubble generating means 4 and the ozone generator 5. Along with fine bubbles made of ozone gas, the water is again returned to the water tank 10 through the supply pipe 2a.

  The water to be treated supplied from the supply port 10a to the water tank 10 rises along the partition plate 8g together with fine bubbles made of ozone gas, as indicated by solid arrows in FIG. After passing through the notch 9c, it descends along the partition plate 8h, passes through the opening 9d of the partition plate 8h, and rises again along the partition plate 8g. Then, after passing through the notch 9c, it descends along the partition plate 8h, passes through the opening 9d, rises again along the partition plate 8g, passes through the notch 9c, and passes from the outlet 10b to the water tank 10 Out to the outside. That is, the notch 9c of the partition plate 8g and the opening 9d of the partition plate 8h function as a flow path for water to be treated and fine bubbles.

  In the wastewater treatment apparatus of the present embodiment, the inclination angle of the partition plates 8g and 8h with respect to the vertical direction can be easily adjusted by using a plurality of spacers 12 having different heights. Therefore, according to the waste water treatment apparatus of the present embodiment, the oil recovery efficiency can be increased by adjusting the rising speed of fine bubbles in a state where the oil contained in the water to be treated is adsorbed on the surface.

  Without using the spacer 12, the partition unit 7d is installed in the water tank 10 so that the end of the partition plates 8g and 8h that are not joined to the connecting plate 8i contacts the side plate 10c provided with the supply port 10a. When the pump 6a is operated in a state where the inside of the water tank 10 is filled with drainage, the water to be treated supplied from the supply port 10a to the water tank 10 is fine as shown by the solid line arrow in FIG. The air bubbles rise while moving left and right along the partition plates 8g and 8h together with the bubbles, and after passing through the notch 9c of the uppermost partition plate 8g, descend and flow out of the water tank 10 through the discharge port 10b.

  In this case, the time during which the water to be treated stays in the water tank 10 becomes much longer than when the partition unit 7d is installed as shown in FIG. Therefore, instead of the ozone generator 5, an oxygen generator (not shown) is connected to the bubble generating means 4, and the fine bubbles made of oxygen gas generated by the bubble generating means 4 are mixed with the water to be treated in the water tank 10. As in the case described with reference to FIG. 5 for the second modification of the first embodiment, the concentration of oxygen dissolved in the for-treatment water can be efficiently increased. Moreover, since the waste water treatment apparatus of the present embodiment includes the lid body 11, the lid body 11 can be easily supplied and pumped by removing the lid body 11 and opening the upper part of the water tank 10. By blocking the upper part of the water tank 10 by 11, the emission of ozone gas supplied to the water tank 10 as fine bubbles from the upper part of the water tank 10 to the atmosphere is prevented. Therefore, the oil can be separated safely and efficiently from the waste water.

  In the first and second embodiments, an ozone generator 5 and an oxygen generator are used as gas supply means for supplying gas to the bubble generating means 4, and ozone gas and oxygen gas are supplied to the bubble generating means 4. However, the wastewater treatment apparatus of the present invention is not limited to such a structure. For example, instead of ozone gas or oxygen gas, an apparatus that supplies a desired gas such as nitrogen, oxygen dioxide, or air may be used as the above gas supply means.

  The present invention is applicable when separating and collecting oil from wastewater contaminated with oil.

  DESCRIPTION OF SYMBOLS 1 ... Water tank 1a ... Supply port 1b ... Discharge port 1c ... Side plate 1d, 1e ... Space 1f ... Bottom plate 2a ... Supply pipe 2b ... Suction pipe 2c ... Gas supply pipe 2d ... Discharge pipe 2e ... Injection pipe 2f ... Pumping pipe 3 ... Flow rate 4 ... Bubble generating means 5 ... Ozone generator 6a-6c ... Pump 7a-7d ... Partition unit 8a-8h ... Partition plate 8i ... Connecting plate 9a-9c ... Notch 9d ... Opening 10 ... Water tank 10a ... Supply port 10b ... Exhaust port 10c, 10d ... Side plate 10e ... Bottom plate 11 ... Cover body 11a ... Exhaust port 12 ... Spacer 13a-13d ... Lower end 13e-13h ... Upper end 14a, 14b ... End 15a, 15b ... End

Claims (6)

A water tank provided with a supply port and a discharge port of water to be treated at the bottom, and the longitudinal direction of which is parallel to the vertical direction;
Bubble generating means for generating fine bubbles having a diameter of 10 ⁻³ to 10 ⁻⁹ m, and supplying the bubbles together with the water to be treated into the water tank from the supply port via a supply pipe;
A gas supply means connected to the bubble generating means via a gas supply pipe;
A pump connected to the discharge port via a suction pipe and supplying the water to be treated to the bubble generating means via a discharge pipe;
A wastewater treatment apparatus comprising: a partition unit that is detachably installed in the water tank and partitions the interior by a plurality of flat plates to form a plurality of spaces. The flat plate has its lower end abutted against the bottom plate of the water tank so as to partition the inside of the water tank and form a first space and a second space communicating with the supply port and the discharge port, respectively. A first partition plate installed parallel to the vertical direction in a state;
A plurality of first plates that are shorter than the first partition plate and are alternately arranged in parallel with each other at a desired interval so as to partition the first space and the second space. 2 partition plates and a third partition plate,
The first partition plate is provided with a first flow path of the water to be treated in the vicinity of the upper end or the lower end thereof,
The second partition plate is erected on both surfaces of the first partition plate so that the lower end thereof is flush with the lower end of the first partition plate,
The third partition plate is erected on both surfaces of the first partition plate so that an upper end thereof is flush with the upper end of the first partition plate. The waste water treatment apparatus as described.   The wastewater treatment apparatus according to claim 1 or 2, wherein an oxygen generator is installed as the gas supply means.   The waste water treatment apparatus according to claim 2, wherein the partition unit is installed such that the second partition plate and the third partition plate are inclined with respect to a vertical direction. The water tank has a rectangular parallelepiped shape, and the supply port and the discharge port are provided at the bottom of a pair of first side plates that are parallel to each other,
The flat plate has a rectangular shape, and a connecting plate, a third partition plate, and a fourth partition plate having the same width as a distance between a pair of second side plates not provided with the supply port and the discharge port. And consists of
The third partition plate and the fourth partition plate are joined to the connecting plate at one end in a state of being alternately arranged at a desired interval so as to be parallel to each other,
The third partition plate is provided with a second flow path of the water to be treated in the vicinity of an end portion on the side not joined to the connection plate,
The waste water treatment apparatus according to claim 1, wherein the fourth partition plate is provided with a third flow path of the water to be treated in the vicinity of the end portion joined to the connection plate.   The waste water treatment apparatus according to any one of claims 1 to 5, wherein an upper part of the water tank is open and a lid is detachably attached so as to close the upper part. .

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