JP2013237008A - Water processing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To promote the generation and micronization of bubbles in wastewater without enlarging a device in the water processing device 1.SOLUTION: According to a water processing device 1, a bubble supplying unit 4 has an air passage 26 passing air sucked by a negative pressure and a wastewater introducing passage 24 opening to a wastewater layer 2 and squeezing and guiding the wastewater sucked from the wastewater layer 2 to an aperture 23. Further, the wastewater flows into the air passage 26 from the wastewater layer 2, the wastewater passing the wastewater introducing passage 24 and the wastewater flowing into the air passage 26 are mixed and discharged to the wastewater layer 2. The circulation quantity of the wastewater in a water processing device 1 is increased and bubbles are micronized at an earlier period because the wastewater of the wastewater layer 2 flows into the bubble supplying unit 4 from the air passage 26 besides the wastewater introducing passage 24. Consequently, the generation and micronization of the bubbles in the waste water can be promoted without enlarging the device in the water processing device 1.

Description

  The present invention relates to a water treatment apparatus for treating waste water generated in association with industrial activities in factories and business establishments, daily life at home, and the like.

  Conventionally, in water treatment, air bubbles are supplied or generated in the waste water for the purpose of air explosion in activated sludge treatment, flotation of flock in the pressurized flotation method, and the like. Various studies have been conducted to further refine the bubbles and increase the processing capacity.

  For example, regarding an air blast, in an explosion device that supplies air as bubbles in water by a rotating impeller, a hollow is provided in the rotating shaft of the rotating impeller and a large number of holes are formed to communicate the hollow with the outside. A technique for miniaturizing bubbles by blowing air from the holes into the water is known (for example, see Patent Document 1). Further, with regard to air explosions, a technique is known in which bubbles are refined by immersing a pipe having a throttle in water, blowing air into the pipe, and then blowing the pipe into the water (see, for example, Patent Document 2). ). Furthermore, in the pressurized levitation method, it is well known that air bubbles in the waste water are refined by using pressurized water in which air is oversaturated and dissolved to enhance the floating effect of flocs (see, for example, Patent Documents 3 and 4). .

However, regarding the air explosion in the activated sludge treatment, further bubble miniaturization is required.
Further, in the pressurized levitation method, when miniaturizing bubbles using pressurized water, it is necessary to use a tank for storing pressurized water as a pressure vessel, which is not convenient. For this reason, even if it can be adopted for a large-scale water treatment apparatus, it is unsuitable for a small amount of water treatment or making the apparatus itself portable, resulting in high costs.

JP 2012-005947 A JP 2011-183328 A JP 2010-162518 A JP-A-6-154729

  The present invention has been made to solve the above-described problems, and an object of the present invention is to promote the generation and miniaturization of bubbles in wastewater without increasing the size of the water treatment apparatus.

[Means of Claim 1]
According to the means of claim 1, the water treatment apparatus has a container that receives drainage and forms a drainage layer, and a throttle that throttles the flow of drainage formed by suction of drainage from the drainage layer, and the negative pressure is generated by the throttle. And a bubble supply means for dispersing and supplying air bubbles to the drainage layer by mixing the sucked air and the drainage and injecting it into the drainage layer.

  The bubble supply means has an air passage through which air sucked by negative pressure is passed, and a drain introduction path that opens to the drainage layer and guides the drainage sucked from the drainage layer to the throttle. Then, wastewater flows into the air passage from the drainage layer, and the wastewater that has passed through the wastewater introduction path and the wastewater that has flowed into the air passage are mixed and injected into the drainage layer.

  As a result, the air is sucked under a negative pressure and is strongly mixed with the wastewater, dispersed as bubbles in the wastewater, and injected into the drainage layer. Further, the waste water in which the bubbles are dispersed is sucked again from the drainage layer and is squeezed and sprayed. The bubbles once contained in the wastewater are refined by repeatedly receiving and jetting together with the wastewater, and further, the negative pressure suction of air is continuously performed, so that new bubbles are added to the wastewater. to continue.

  Further, since the drainage of the drainage layer flows into the bubble supply means from the air passage along with the drainage introduction path, the circulation flow rate of the drainage in the water treatment apparatus increases, and the bubbles are refined earlier. For this reason, in a water treatment apparatus, generation | occurrence | production and refinement | miniaturization of the bubble in waste_water | drain can be accelerated | stimulated, without enlarging an apparatus.

[Means of claim 2]
According to the means of claim 2, the tube tip forming the air suction port of the air passage protrudes from the drainage layer so that the air suction port opens to the atmosphere vertically upward. Then, the drainage of the drainage layer overflows the cylinder tip due to the rise of the liquid level of the drainage layer and flows into the air passage from the air suction port.
Thereby, for example, the liquid level of the drainage layer can be raised by the inclusion of bubbles, so that the drainage can be allowed to flow into the air passage without providing a pump or the like separately. For this reason, waste water can be made to flow into an air passage cheaply and simply. Moreover, since the air bubbles collected on the liquid surface of the drainage layer can be sucked into the air passage from the air suction port, an excessive increase in the liquid surface due to the air bubbles can be suppressed.

[Means of claim 3]
According to the third aspect of the present invention, the air suction port opens to the atmosphere even in a direction non-parallel to the vertical direction other than vertically upward at the cylinder tip.
Thereby, the inflow amount of the waste_water | drain to an air path can be increased simply.

[Means of claim 4]
According to the fourth aspect of the present invention, the air passage is supplied with an aggregating agent that aggregates pollutants contained in the wastewater and floats together with air bubbles. The aggregating agent is sucked together with the air and dispersedly supplied to the wastewater. .
As a result, the flocculant is sucked together with air under a negative pressure and is mixed strongly with the waste water, and further, the mixing with the waste water is promoted by the bubbles. For this reason, the dispersion | distribution capability to the waste_water | drain of a coagulant | flocculant can be improved in a water treatment apparatus. In addition, since the bubbles are refined by repeating negative pressure suction and injection, the floating effect of the flock can be enhanced.

[Means of claim 5]
According to the means of claim 5, the air passage is formed by a flexible tube that bends freely.
Thereby, the positions of the air suction port, the drainage inlet, and the flocculant inlet can be freely set.

[Means of claim 6]
According to the sixth aspect of the present invention, the water treatment device receives the waste water to be treated from the outside of the water treatment device via the air suction port of the air passage.
This eliminates the need for providing a drainage receiving port separately.

It is a block diagram of a water treatment apparatus (Example). It is explanatory drawing which shows the inflow state of the waste_water | drain to an air suction opening (Example). (A) is a top view which shows the cylinder tip of an intake pipe, (b) is a side view which shows the cylinder tip of an intake pipe (modification).

  The water treatment apparatus of the embodiment has a container that receives drainage to form a drainage layer, and a throttle that throttles the flow of drainage formed by suction of drainage from the drainage layer, and generates negative pressure by the throttle to generate air. In addition to suction, the air supply unit includes bubble supply means for dispersing and supplying air bubbles to the drainage layer by mixing the sucked air and drainage and injecting the mixture into the drainage layer.

  The bubble supply means has an air passage through which air sucked by negative pressure is passed, and a drain introduction path that opens to the drainage layer and guides the drainage sucked from the drainage layer to the throttle. Then, wastewater flows into the air passage from the drainage layer, and the wastewater that has passed through the wastewater introduction path and the wastewater that has flowed into the air passage are mixed and injected into the drainage layer.

Further, the tube tip forming the air suction port of the air passage protrudes from the drainage layer so that the air suction port opens vertically to the atmosphere. Then, the drainage of the drainage layer overflows the cylinder tip due to the rise of the liquid level of the drainage layer and flows into the air passage from the air suction port.
Further, the air passage is supplied with a flocculant that aggregates pollutants contained in the waste water and floats together with air bubbles, and the flocculant is sucked together with the air and dispersedly supplied to the waste water.

[Configuration of Example]
The structure of the water treatment apparatus 1 of an Example is demonstrated using drawing.
As shown in FIG. 1, the water treatment device 1 mixes and discharges the wastewater to be treated and the container 3 that forms the drainage layer 2, the wastewater of the drainage layer 2, and air, and injects them into the drainage layer 2. It is provided with bubble supply means 4 that supplies air bubbles to the drainage layer 2 in a distributed manner, and is suitably used for, for example, activated sludge treatment with air explosions, pressurized flotation methods in the coagulation removal of contaminants, etc. Can do.

  The bubble supply means 4 has a drive source 5 that applies energy to the drainage and air to flow, and a flow path forming unit 6 that forms a flow path through which the drainage and air pass, and is left stationary in the container 3. Almost the whole is immersed in the drainage layer 2.

  The drive source 5 includes, for example, an electric motor 8 that generates torque by energization, a rotary impeller 10 that is attached to the tip of the output shaft 9 of the electric motor 8, and a main body 8 a of the electric motor 8 and the rotary impeller 10. This is a well-known submersible pump having a bearing device 11 and the like for supporting the output shaft 9 therebetween and sealing lubricating oil.

The drive source 5 is placed stationary in the order of the main body 8a of the electric motor 8, the bearing device 11, and the rotary impeller 10 in the vertical direction, and the main body 8a and the bearing device 11 of the electric motor 8 are It is immersed in the drainage layer 2 so that internal components are not exposed to the drainage.
The main body 8a of the electric motor 8 is a portion that has a rotor and a stator and converts electrical energy into mechanical energy by electromagnetic action, and the output shaft 9 is integrated with the rotor.

  The flow path forming unit 6 includes a pump casing 13, a nozzle 14, an intake casing 15, an intake pipe 16, a diffuser 17, and the like described below.

  The pump casing 13 accommodates the rotary impeller 10 and constitutes a pump, and accommodates the rotary impeller 10 and forms a drainage suction chamber 19 that opens to the drainage layer 2. Here, the opening 20 for introducing the drainage into the drainage suction chamber 19 opens downward in the drainage layer 2 on the lower side of the rotary impeller 10, and the opening 20 is connected to the flow path forming unit 6. It functions as a drainage suction port (hereinafter, the opening 20 is referred to as a drainage suction port 20). Further, the pump casing 13 is provided with a short pipe portion 21 for discharging the drainage from the drainage suction chamber 19 in the horizontal direction. The drainage discharge path formed in the drainage suction chamber 19 and the short pipe portion 21 forms a drainage introduction path 24 that guides the drainage sucked from the drainage layer 2 to the throttle 23.

  The nozzle 14 forms a throttle 23 that restricts the flow of drainage, and is attached to the tip of the short pipe portion 21. The nozzle 14 squeezes the waste water in the horizontal direction while maintaining the flow of the waste water in the horizontal direction.

  The intake casing 15 is provided integrally with the nozzle 14, forms a negative pressure chamber 25 in which a negative pressure is generated by the flow of waste water ejected from the nozzle 14, and sucks air from the atmosphere into the negative pressure chamber 25. . That is, the nozzle 14 is integrated with the intake casing 15 so that the injection port of the throttle 23 is disposed in the negative pressure chamber 25, and the waste water is injected horizontally into the negative pressure chamber 25, thereby A negative pressure is generated and air is sucked into the negative pressure chamber 25.

  The intake pipe 16 forms an air passage 26 through which air sucked into the negative pressure chamber 25 is sucked from the atmosphere. The intake pipe 16 is arranged in parallel with the vertical direction and connected to the intake casing 15 from above, and the air passage 26 opens above the negative pressure chamber 25. The air sucked through the air passage 26 is dispersed as bubbles in the drainage in the negative pressure chamber 25.

  The air suction port 28 of the air passage 26 is formed in a tube tip 29 on the upper side of the intake pipe 16, and the tube tip 29 protrudes from the drainage layer 2 so that the air suction port 28 opens to the atmosphere vertically above. Yes. That is, the intake pipe 16 is arranged so that the tip of the tube tip 29 is located above the liquid level of the drainage layer 2, and almost all of the intake pipe 16 is immersed in the drainage layer 2 except for the upper portion including the tip of the tube tip 29. ing. Further, the inner diameter of the tube tip 29 is set larger than the inner diameter of the other portion, and the inner diameter of the lower side of the tube tip 29 is reduced in a tapered shape.

  The diffuser 17 forms a flow path having a single inner diameter on the upstream side and introduces drainage from the intake casing 15, and is provided continuously on the downstream side of the introduction part 30 and coaxially with the introduction part 30. Has an enlarged portion 31 that forms a flow path that increases in diameter toward the downstream side. The diffuser 17 is disposed on the intake casing 15 so that the introduction portion 30 and the nozzle 14 are coaxial, and the opening of the introduction portion 30 and the injection port of the nozzle 14 are opposed to each other in the negative pressure chamber 25. It is connected.

  Further, in the diffuser 17, the flow path of the enlarged portion 31 opens into the drainage layer 2, and the opening 32 of the enlarged portion 31 functions as a discharge port for drainage from the flow path forming portion 6 (hereinafter, the enlarged portion 31). The opening 32 is referred to as a drain outlet 32). As described above, the diffuser 17 receives the wastewater in which air bubbles are dispersed from the negative pressure chamber 25, further disperses the bubbles in the wastewater, and injects the wastewater into the drainage layer 2.

  The container 3 is provided in a cylindrical shape, for example, so as to have an axis parallel to the flow path axis of the diffuser 17, and is closed by a spherical inner wall bulging outward in the axial direction. Thereby, the waste water ejected from the waste water ejection port 32 can smoothly circulate in the container 3 along the spherical inner wall while forming the drainage layer 2.

  In the water treatment apparatus 1 having the above configuration, when the electric motor 8 is energized, the drainage of the drainage layer 2 is introduced from the drainage suction port 20 into the drainage introduction path 24 and further from the throttle 23 to the negative pressure chamber 25. To generate negative pressure. As a result, air is sucked from the air suction port 28 into the negative pressure chamber 25 and mixed with waste water, and air bubbles are dispersed in the waste water. Then, waste water containing air bubbles is jetted from the drain jet port 32 to the drainage layer 2.

  For this reason, bubbles are dispersedly supplied to the drainage layer 2, and the wastewater containing bubbles circulates in the drainage layer 2 and is again sucked and injected by the bubble supply means 4. As a result, the bubbles once contained in the wastewater are refined by repeatedly receiving suction and jetting together with the wastewater, and further by adding negative pressure to the air, new bubbles are added to the wastewater. Continue to be. Further, since the wastewater containing bubbles is repeatedly stirred by the rotary impeller 10 in the drainage suction chamber 19, the refinement of the bubbles is further promoted. Since the bubbles contained in the waste water are made fine, the waste water sucked into the waste water suction chamber 19 contains bubbles, but the discharge capability of the drive source 5 does not decrease.

  Further, when bubbles are included in the drainage, the liquid level of the drainage layer 2 rises, so that the drainage of the drainage layer 2 overflows the tube tip 29 and flows into the air passage 26 from the air suction port 28 (FIG. 2). reference.). Then, the bubble supply means 4 mixes the wastewater that has passed through the wastewater introduction passage 24 and the wastewater that has flowed into the air passage 26 in the negative pressure chamber 25 or the flow passage in the diffuser 17 and injects it into the drainage layer 2. Thereby, since the circulation flow volume of the waste_water | drain in the water treatment apparatus 1 increases, a bubble is refined earlier.

  When the water treatment apparatus 1 is used for the pressure levitation method, for example, the flocculant powder is introduced into the air suction port 28 and sucked into the negative pressure chamber 25 through the air passage 26 together with the air. Thus, the flocculant powder is strongly mixed with the waste water together with the air, and further, the mixing with the waste water is promoted by the air bubbles. The drainage of the drainage layer 2 is repeatedly subjected to suction and jetting by the bubble supply means 4, and the circulation flow rate of drainage by the bubble supply means 4 sucks drainage from both the drainage introduction path 24 and the air passage 26. Therefore, the flocculant is dispersed in the waste water very quickly.

[Effects of Examples]
According to the water treatment apparatus 1 of the embodiment, the bubble supply means 4 has the throttle 23 that restricts the flow of drainage formed by suction of drainage from the drainage layer 2, and generates negative pressure by the throttle 23 to generate air. In addition to suction, the sucked air and waste water are mixed and sprayed onto the drainage layer 2 to distribute and supply air bubbles to the drainage layer 2.

  The bubble supply means 4 has an air passage 26 through which air sucked by negative pressure is passed, and a drain introduction path 24 that opens to the drainage layer 2 and guides the drainage sucked from the drainage layer 2 to the throttle 23. Then, wastewater flows into the air passage 26 from the drainage layer 2, and the wastewater that has passed through the wastewater introduction passage 24 and the wastewater that has flowed into the air passage 26 are mixed and injected into the drainage layer 2.

  As a result, the air is sucked under a negative pressure and is strongly mixed with the wastewater, dispersed as bubbles in the wastewater, and injected into the drainage layer 2. Further, the waste water in which the bubbles are dispersed is sucked again from the drainage layer 2 and is squeezed and sprayed. The bubbles once contained in the wastewater are refined by repeatedly receiving and jetting together with the wastewater, and further, the negative pressure suction of air is continuously performed, so that new bubbles are added to the wastewater. to continue.

  Further, since the drainage of the drainage layer 2 flows into the bubble supply means 4 from the air passage 26 together with the drainage introduction path 24, the circulation flow rate of the drainage in the water treatment apparatus 1 increases, and the bubbles are refined earlier. Is done. For this reason, in the water treatment apparatus 1, generation | occurrence | production and refinement | miniaturization of the bubble in waste_water | drain can be accelerated | stimulated, without enlarging an apparatus.

Further, the tube tip 29 that forms the air suction port 28 protrudes from the drainage layer 2 so that the air suction port 28 opens vertically to the atmosphere. The drainage of the drainage layer 2 overflows the tube tip 29 due to the rise in the liquid level of the drainage layer 2 and flows into the air passage 26 from the air suction port 28.
Accordingly, the waste water can be allowed to flow into the air passage 26 without separately providing a pump or the like. For this reason, waste water can be made to flow into air passage 26 cheaply and simply. Moreover, since the air bubbles collected on the liquid surface of the drainage layer 2 can be sucked into the air passage 26 from the air suction port 28, an excessive increase in the liquid surface due to the air bubbles can be suppressed.

The air passage 26 is supplied with a flocculant powder for subjecting the waste water to a pressure levitation method, and the flocculant powder is sucked together with the air and dispersedly supplied to the waste water.
As a result, the coagulant is sucked together with air under a negative pressure and is strongly mixed with the waste water, and further, mixing with the waste water is promoted by air bubbles. For this reason, in the water treatment apparatus 1, the dispersion | distribution capability to the waste_water | drain of a coagulant | flocculant can be improved.
In addition, since fine bubbles can be supplied into the waste water by the bubble supply means 4, the floating effect of the flock can be enhanced without using pressurized water.

In addition, according to the water treatment apparatus 1, since the bubble is refined | miniaturized by receiving suction and injection repeatedly, the floating effect of a floc is very high.
Moreover, since the circulation flow rate of the waste water in the water treatment apparatus 1 is large and the bubbles are refined early, the dispersibility of the flocculant into the waste water is extremely high.

  Moreover, the drive source 5 arranges the rotary impeller 10 vertically below the main body 8a of the electric motor 8, and does not use the general-purpose submersible pump with an irregular arrangement (for example, The rotary impeller 10 is not used by being disposed vertically above the main body 8a). For this reason, the lifetime and reliability of the drive source 5 are high, and the cost required for an irregular arrangement does not occur.

[Modification]
The aspect of the water treatment apparatus 1 is not limited to an Example, A various modification can be considered.
For example, according to the water treatment apparatus 1 of the embodiment, the wastewater overflowed the tube tip 29 and flowed into the air passage 26 due to the rise in the liquid level of the drainage layer 2 due to the inclusion of bubbles. The drainage may be caused to flow into the air passage 26 by means. Furthermore, the liquid level of the drainage layer 2 may be raised by newly adding wastewater to be treated to the drainage layer 2.
Further, according to the water treatment apparatus 1 of the embodiment, the throttle 23 is arranged on the discharge side (downstream side) of the rotary impeller 10, but the throttle 23 is arranged on the suction side (upstream side) of the rotary impeller 10. May be.

  Further, according to the water treatment apparatus 1 of the embodiment, the air suction port 28 is open to the atmosphere only in the vertical direction at the tube tip 29, but in the direction other than the vertical upper direction in the tube tip 29, in a direction non-parallel to the vertical direction, The air suction port 28 may be opened to the atmosphere. For example, as shown in FIG. 3, the tube tip 29 may have a comb-like cut 34 to open the air suction port 28 in a direction perpendicular to the vertical direction. In this case, the amount of wastewater flowing into the air passage 26 can be increased easily.

Further, according to the water treatment apparatus 1 of the embodiment, the air passage 26 is provided by a highly rigid cylinder, but the air passage 26 may be formed by a flexible tube that bends freely. In this case, the air suction port 28 can be set freely.
Furthermore, since the waste water to be treated is received from the outside of the water treatment apparatus 1 via the air suction port 28, it is not necessary to separately provide a waste water receiving port.

  Further, according to the water treatment apparatus 1 of the embodiment, the powder of the flocculant was introduced from the air suction port 28 and the water treatment apparatus 1 was used for the pressure levitation method. Is not limited to the pressurized flotation method. For example, you may use the water treatment apparatus 1 for the activated sludge process by an air explosion.

  In addition to the flocculant, other functional powder such as activated carbon, ion exchange resin or chelate resin may be supplied to the wastewater as the functional powder for performing a predetermined treatment on the wastewater. The body may be previously dispersed in water to adjust the water slurry of the functional powder, and the water slurry of the functional powder may be supplied to the waste water. Further, when the functional powder is introduced into the water treatment apparatus 1, the powder introduction path of the functional powder may be branched from the air passage 26 and a powder inlet may be provided separately from the air suction port 28.

DESCRIPTION OF SYMBOLS 1 Water treatment apparatus 2 Drainage layer 3 Container 4 Bubble supply means 23 Restriction 24 Drainage introduction path 26 Air path 28 Air suction port 29 Tube tip

Claims (6)

A container for receiving drainage and forming a drainage layer;
It has a throttle that restricts the flow of drainage formed by suctioning the drainage from the drainage layer, and it generates negative pressure to suck air and mixes the sucked air and drainage into the drainage layer. A bubble supply means for supplying and supplying air bubbles to the drainage layer by spraying,
The bubble supply means has an air passage through which air sucked by a negative pressure passes, and a drain introduction path that opens to the drainage layer and guides drainage sucked from the drainage layer to the throttle,
Drainage flows from the drainage layer into the air passage,
The water treatment apparatus characterized in that the wastewater that has passed through the wastewater introduction passage and the wastewater that has flowed into the air passage are mixed and injected into the drainage layer. The water treatment apparatus according to claim 1,
The tube tip forming the air suction port of the air passage protrudes from the drainage layer so that the air suction port opens to the atmosphere vertically above,
The drainage of the drainage layer overflows the tip of the cylinder due to a rise in the liquid level of the drainage layer and flows into the air passage from the air suction port. The water treatment device according to claim 2,
The water treatment device according to claim 1, wherein the air suction port is open to the atmosphere in a direction other than vertically above the cylinder tip in a direction non-parallel to the vertical direction. In the water treatment apparatus according to any one of claims 1 to 3,
The air passage is supplied with a flocculant that agglomerates pollutants contained in the waste water and floats together with air bubbles,
A water treatment apparatus, wherein the flocculant is sucked together with air and dispersedly supplied to waste water. In the water treatment apparatus according to any one of claims 1 to 4,
The water treatment apparatus is characterized in that the air passage is formed by a flexible tube that bends freely. In the water treatment apparatus according to any one of claims 1 to 5,
A water treatment apparatus, wherein waste water to be treated is received from outside the water treatment apparatus via an air suction port of the air passage.

Images