JP4689569B2 - Sewage treatment equipment - Google Patents

Description

  The present invention relates to an apparatus for treating sewage containing organic matter such as livestock excreta, and more particularly to an apparatus for decomposing organic matter in sewage separated into solid and liquid by the action of microorganisms.

Conventionally, as a method of treating livestock urine sewage, as shown in FIG. 4, first, manure discharged from a barn 51 and stored in a raw water tank 52 is sent to a settling tank 53 to settle solid matter such as feces. After that, the liquid phase portion was sent to the solid-liquid separation device 55 by the pump 60 to separate the urine sewage, and the solid-liquid separated urine sewage was adhered to the surface by aerobic microorganisms. A method of decomposing organic matter in the urine wastewater with the microorganisms while sending the air to an aeration tank 56 in which a carrier 56a made of a porous material is installed and discharging air into the aeration tank 56 by an air pump 56b such as a blower. It has been known.
By the way, in order to activate and proliferate the microorganisms, an appropriate temperature (for example, 10 to 30 ° C.) and a sufficient dissolved oxygen concentration are required. As described above, the air pump 56b is provided in the aeration tank 56. Since only the air was discharged, the particle diameter of the bubbles was large, so that oxygen could not be sufficiently dissolved in the urine wastewater in the aeration tank 56. For this reason, the microorganisms cannot be sufficiently activated, and the microorganisms cannot be propagated, so that it is difficult to efficiently treat the urine waste water.

Therefore, the applicant, as shown in FIG. 5, on the upper part of the first aeration tank 64 provided with a carrier 61 having microorganisms attached to the surface and a submersible pump 63 having an intake pipe 62 attached to the suction side, A second aeration tank 66 provided with a carrier 65 similar to the carrier 61 is installed, and discharged into the second aeration tank 66 while air bubbles in the urine sewage discharged from the submerged pump 63 are made finer. At the same time, the urine sewage in the upper part of the second aeration tank 66 is led to a circulation discharge pipe 68 in which an air introduction pipe 67 is installed, and the first fine bubbles attached to the lower part of the discharge pipe 68. By returning to the inside of the first aeration tank 64 through the jetting means 69A, the dissolved oxygen concentration in the first and second aeration tanks 64 and 66 is sufficiently increased, and the microorganism is activated. Urine sewage treatment device 60 can be provided It is. Reference numeral 69B denotes second fine bubble jetting means for further refining the bubbles in the urine sewage discharged from the submersible pump 63 and returning them into the first aeration tank 64, and reference numeral 66P denotes a discharge from the submersible pump 63. 2 is a transfer pipe for transferring the urine wastewater into the second aeration tank 66.
In the urine sewage treatment apparatus 60, as shown in FIG. 6, the suction pipe 62 is disposed in the vicinity of the suction port of the submersible pump 63, so that the first screw blade 63k of the submersible pump 63 rotated by the motor 63M is used. When the urine sewage in the aeration tank 61 is drawn to the suction side of the submersible pump 63, the air in the atmosphere is discharged from the intake pipe 62 to the suction port by utilizing the negative pressure in the vicinity of the suction port. It can be supplied to the vicinity. Therefore, since the supplied air can be mixed in the urine sewage by the screw blade 63k, the air is sent from the discharge pipe 63n of the submersible pump 63 to the second aeration tank 66 through the transfer pipe 66P. The concentration of dissolved oxygen in the urine wastewater can be increased, and the microorganisms can be activated (see, for example, Patent Document 1).
JP 2005-230717 A

  However, in general, since the submersible pump 63 has a wide opening on the screw blade 63k side, the flow rate of urine sewage sucked is large at the peripheral edge of the opening, but the opening in which the opening of the intake pipe 62 is installed Since the flow velocity in the vicinity of the center of the section is smaller than that at the peripheral portion, the amount of air supplied from the intake pipe 62 is not necessarily sufficient, and in order to increase the dissolved oxygen concentration in the urine wastewater sent to the second aeration tank 64 There was a limit.

  The present invention has been made in view of the above-described conventional problems, and provides a sewage treatment apparatus capable of sufficiently increasing the dissolved oxygen concentration in sewage by increasing the amount of air supplied from the intake pipe. With the goal.

Water invention described in claim 1 of the present application, which comprises a reservoir sewage containing solid-liquid separation organics is stored, and a screw blade which is rotated by a motor and the motor, Ru is installed in the storage tank pump and, first air inlet pipe for supplying air to the opening side of the water pump is a front side of the upper Symbol screw blade, Ru is installed in the upper portion of the reservoir, carrier microorganisms on the surface is attached a septic tank provided with a discharge means for discharging the sewage discharged from the water pump into the septic tank, a discharge pipe for the upper portion of the septic tank return sewage in the septic tank to the storage tank, the interior of the discharge pipe Ru is disposed, one end met sewage treatment apparatus and a second air introduction pipe which opens to the projection port side of the discharge pipe, the opening side is disposed on the opening side of the water pump comprising a shield member for covering the center of the The above shield member, one end opening to the center of the opening of the water pump and the other end is connected to the first air inlet tube above the upper Symbol air sent from the first air inlet pipe An intake air introduction section is provided to be supplied to the opening side of the submersible pump.
According to a second aspect of the invention, the wastewater treatment device according to claim 1, in the storage tank, in which microorganisms have established a deposited carrier on the front surface.
According to a third aspect of the present invention, in the sewage treatment apparatus according to the first or second aspect of the present invention, a water passage regulating piece that protrudes toward the second air introduction pipe is provided on the inner wall of the discharge pipe. .
According to a fourth aspect of the present invention, in the sewage treatment apparatus according to any one of the first to third aspects, a heat insulating material is disposed around the septic tank.

According to the present invention, in the reservoir sewage is stored comprising solid-liquid separation organics, microorganisms attached to a surface of the installation of Lesotho sewage in the storage tank at the top of the upper Symbol reservoir A submersible pump that discharges into a septic tank equipped with a carrier is disposed, and a shielding member that covers the center of the submerged pump opening side is disposed on the front side of the screw blade that is the opening side of the submersible pump. through the member, the air sent from the first air inlet tube. Thus supplying air to the water pump from the water pump side of the shielding member, is supplied from the first air inlet pipe The amount of air can be increased to sufficiently increase the dissolved oxygen concentration in the sewage . Therefore, the microorganism can be activated, the microorganism can be grown, and the wastewater can be efficiently decomposed.
At this time, if a carrier having microorganisms attached to the surface thereof is also installed in the storage tank, the organic matter in the sewage can be decomposed even in the storage tank, so that the decomposition treatment capacity is improved.
Furthermore, if a water passage regulating piece protruding toward the second air introduction pipe is provided on the inner wall of the discharge pipe so that air is entrained in the sewage returned to the storage tank via the discharge pipe, The dissolved oxygen concentration inside can be further increased.
In addition, if a heat insulating material is arranged around the septic tank to stabilize the temperature in the septic tank, the activity of the microorganism can be stabilized with a simple configuration, so the sewage can be efficiently decomposed. Can be processed.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing a configuration of a sewage treatment apparatus 10 according to the best mode. In the figure, 1 is a storage tank for storing sewage such as urine sewage separated into solid and liquid, and 2 is a storage tank 1. A septic tank installed in the upper part, 3 is an aeration / water discharge pump device installed in the storage tank 1, 4 is a transfer pipe for sending sewage discharged from the aeration / water discharge pump device to the septic tank 2, and 5 is in the septic tank 2 The first discharge means 5 is provided on the bottom side of the carrier 6 on the surface of which the microorganisms for decomposing the organic matter in the sewage are attached. The first discharge means 5 is pumped through the transfer pipe 4. There are provided a plurality of nozzles 5n for discharging the sewage into the septic tank 2 while minimizing bubbles contained in the sewage. Reference numeral 7 denotes a return discharge pipe 71 for returning the sewage from the upper part of the septic tank 12 to the storage tank 2, and one end opened in the discharge pipe 71 and the other end is the discharge pipe. A second discharge means 8 including an air introduction pipe (second air introduction pipe) 72 opened on the discharge outlet side of 71 is a heat insulating material provided around the septic tank 2.

As shown in FIG. 2, the aeration / water discharge pump device 3 includes a motor 31M, a screw blade 31k rotated by the motor 31M, and a discharge pipe 31n provided on the feed side of the screw blade 31k. The pump 31, the mounting member 32 for mounting the motor 31M, the shielding member 33 for regulating the flow path on the opening side of the submersible pump 31, one end opened to the air, and the other end to the shielding member 33. In this example, the shielding member 33 is connected to the front side of the screw blade 31k of the submersible pump 31. The intake pipe (first air introduction pipe) 34 is connected to an intake pipe 33s, which will be described later. Provided in the lower part of the intake air inlet 33b, a shield 33a covering the vicinity of the center of the opening of the submersible pump 31, an intake air inlet 33b connected to the intake pipe 34, and the intake air inlet 33b. In addition, the intake member 33 is provided with an intake introduction path 33 s having one end opened to the submersible pump 31 side and the other end communicating with the intake pipe 34. Air is supplied to the vicinity of the center of the opening of the submersible pump 31.
The attachment member 32 is formed with a pump attachment portion 32a for attaching the submersible pump 31 having a gate-shaped cross section and having a sewage introduction hole 32v formed on the side surface thereof, and a plurality of sewage introduction holes 32h. A bottom plate 32b, and a leg portion 32c for supporting the bottom plate 32b and separating the attachment member 32 from the bottom surface of the storage tank 1 by a predetermined distance. Is introduced into the submersible pump 31 through the sewage introduction holes 32h and 32v.
On the other hand, as shown in FIG. 3, the discharge pipe 71 of the second discharge means 7 has a sewage introduction port 71 s (see FIG. 1) for introducing the sewage above the septic tank 2 into the discharge pipe 71. On the discharge side of the air introduction pipe 72, a provided pipe body 71a, a tapered portion 71b whose diameter is reduced, and a gas-liquid mixing portion 71c provided at the lower portion of the tapered portion 71b are provided. A plurality of water channel regulating pieces 71m projecting toward the air introduction pipe 72 are provided on the inner wall of the pipe body 71a.

Next, the wastewater treatment method according to the present invention will be described.
First, after storing the sewage separated by a solid-liquid separator (not shown) in the storage tank 1 and the septic tank 2, the motor 31M is driven to operate the submersible pump 31. When the screw blade 31k of the submersible pump 31 rotates, the sewage in the storage tank 1 is drawn into the suction side of the submersible pump 31 through the sewage introduction holes 32h and 32v of the mounting member 32.
The flow velocity near the suction port of the submersible pump 31 is generally large at the peripheral edge of the opening on the screw blade 31k side, but the flow velocity near the center of the opening is smaller than the peripheral edge. The shielding member 33 is arranged so that the shielding portion 33a of the shielding member 33 is located on the front side of the screw blade 31k, which is the opening side of the submersible pump 31, and the sewage suction passage is restricted. Thereby, the suction flow path of the sewage is narrowed, and the flow rate of the sewage sucked in is greatly increased as compared with the case where the shielding member 33 is not provided, so that the gap between the shielding member 33 and the suction port of the submersible pump 31 Large negative pressure is generated.
On the other hand, one end of the intake pipe 34 opens into the air, and the other end communicates with the intake introduction path 33 s of the shielding member 33 that opens near the suction port of the submersible pump 31. It is supplied from the intake pipe 34 to the vicinity of the intake port. This air is entrained and mixed in the sewage by the rotation of the screw blade 31k.
In this example, since the negative pressure generated between the shielding member 33 and the suction port of the submersible pump 31 is larger than the conventional one, the amount of air supplied from the intake pipe 34 increases. Accordingly, sewage having a high dissolved oxygen concentration is discharged from the discharge pipe 31n of the aeration / discharge pump device 3. This sewage having a high dissolved oxygen concentration is sent to the septic tank 2 through the transfer pipe 4 and discharged from the nozzle 5n of the first discharge means 5 into the septic tank 2. At this time, since the bubbles contained in the sewage are further refined by the jetting action of the nozzle 5n, the oxygen in the bubbles can be sufficiently dissolved in the sewage in the septic tank 2, and the dissolved oxygen concentration in the sewage can be increased. It can be raised enough. Therefore, the microorganisms adhering to the surface of the carrier 6 installed in the septic tank 2 can be sufficiently activated and the microorganisms can be propagated, so that the sewage can be efficiently decomposed.

When sewage is supplied from the first discharge means 5 into the septic tank 2, the water level in the septic tank 2 rises. When this water level reaches the sewage introduction port 71s formed in the upper part of the return discharge pipe 71, the sewage in the upper part of the septic tank 2 flows into the pipe body 71a from the sewage introduction port 71s while entraining air. The sewage that has flowed into the pipe main body 71a collides with a plurality of water channel regulating pieces 71m provided on the inner wall of the pipe main body 71a, and further entrains ambient air. Fine bubbles are generated.
The sewage containing a large number of fine bubbles is collected around the air introduction pipe 72 at the tapered portion 71b of the discharge pipe 71, and comes into contact with the air in the air introduction pipe 72 at the gas-liquid mixing section 71c. At this time, since the sewage falls by the height of the septic tank 2, the flow velocity becomes extremely high. For this reason, since the sewage is discharged into the water storage layer 1 while entraining the air below the air introduction pipe 71 in the gas-liquid mixing part 71c, a large number of fine bubbles are also generated in the sewage here. . Since the sewage containing the fine bubbles is returned to the water reservoir 1, the dissolved oxygen concentration of the sewage in the water reservoir 1 is also increased. Thereby, since sewage with high dissolved oxygen concentration can be circulated, the said microorganisms can be activated and the organic substance in the said sewage can be decomposed | disassembled efficiently.
Further, in order to activate and propagate the microorganism, it is necessary to keep the temperature in the septic tank 2 at 10 ° C. to 30 ° C. In this example, the periphery of the septic tank 2 is made of foamed plastic such as rigid foam polyurethane. Since the temperature of sewage in the septic tank 2 is stabilized by being surrounded by the heat insulating material 8, the activity of the microorganisms can be stabilized without using a heater or a cooling device.

Thus, according to this best mode, the organic matter in the sewage is formed on the surface of the reservoir 1 provided with the submersible pump 31 having the intake pipe 34 as the first air introduction pipe attached to the suction side. The septic tank 2 including the carrier 6 to which the microorganisms that decompose the sewage are attached is installed and discharged into the septic tank 2 while minimizing the bubbles in the sewage discharged from the submersible pump 31, and the sewage above the septic tank 2 In the sewage treatment apparatus having a configuration in which the air is introduced into a circulation discharge pipe 71 in which an air introduction pipe 72 is installed and returned from the discharge pipe 71 to the storage tank 1, a shielding member is provided on the opening side of the submersible pump 31. 33 is disposed to restrict the intake flow path of the sewage, and the intake pipe communicates with the intake introduction path 33 s of the shielding member 33 having one end opened into the air and the other end opened near the suction port of the submersible pump 31. 3 The arranged. Thus it is possible to involve a large amount of air into the wastewater is sent to a septic tank 2 by the water pump 31, it is possible to sufficiently increase the concentration of dissolved oxygen in the wastewater. Therefore, since the microorganisms in the septic tank 2 can be activated and the microorganisms can be grown, the sewage can be efficiently decomposed.
In addition, a water channel regulating piece 71m that protrudes toward the air introduction pipe 72 that is the second air introduction pipe is provided on the inner wall of the discharge pipe 71, and the sewage returned to the storage tank 1 through the discharge pipe 71 Since air is entrained, the dissolved oxygen concentration in the sewage can be further increased.
Moreover, since the heat insulating material 8 is disposed around the septic tank 2, the temperature in the septic tank 2 can be stabilized, and the sewage can be reliably decomposed.

In the above-mentioned best mode, the carrier 6 to which microorganisms are attached is installed only in the septic tank 2, but the sewage having a high dissolved oxygen concentration is returned to the water storage tank 1. If a carrier to which microorganisms are attached is installed to decompose organic matter in the sewage in the water storage tank 1, the efficiency of the sewage decomposition treatment can be further improved.
In the above example, the intake pipe 34 and the intake air introduction path 33 s provided in the shielding member 33 are communicated to supply the air from the intake pipe 34 to the suction port of the submersible pump 31. You may make it open the opening part to the submersible pump 31 side of the said shielding member 33 through the said intake pipe 34 in the intake air introduction part 33b.

  According to the present invention, since organic substances contained in sewage can be easily decomposed with a simple configuration, it is possible to efficiently and inexpensively treat livestock excreta, and to purify the natural environment. Can contribute to preservation.

It is a figure which shows the structure of the sewage treatment apparatus which concerns on the best form of this invention. It is a figure which shows the structure of the aeration water discharge pump apparatus which concerns on this best form. It is principal part sectional drawing of the 2nd discharge means which concerns on this best form. It is a figure which shows the processing method of the conventional sewage. It is a figure which shows the structure of the processing apparatus of the conventional urine wastewater. It is a figure which shows the structure of the aeration water discharge pump apparatus used for the processing apparatus of the conventional urine sewage.

Explanation of symbols

1 storage tank, 2 septic tank, 3 aeration / drainage pump device, 4 transfer pipe, 5 first discharge means, 5n nozzle, 6 carrier to which microorganisms are attached, 7 second discharge means, 8 heat insulating material,
31 submersible pump, 31M motor, 31k screw blade, 31n discharge pipe, 32 mounting member, 32a pump mounting section, 32b leg section, 32c bottom plate,
32h, 32v Sewage introduction hole, 33 shielding member, 33a shielding part, 33b intake introduction part, 33c base, 33s intake introduction path, 34 intake pipe, 71 discharge pipe, 71a pipe body,
71b taper part, 71c gas-liquid mixing part, 71m water channel regulating piece, 71s sewage introduction port,
72 Air inlet tube.

Claims (4)

A storage tank in which sewage containing organic matter separated into solid and liquid is stored;
And a screw blade which is rotated by a motor and the motor, a water pump that will be installed in the storage tank,
A first air inlet pipe for supplying air to the opening side of the water pump is a front side of the upper Symbol screw blade,
Ru is placed on top of the storage tank, a septic tank with microorganisms is attached carrier to a surface,
Discharge means for discharging the sewage discharged from the submersible pump into the septic tank;
A discharge pipe for returning the sewage in the septic tank from the upper part of the septic tank to the storage tank;
Ru is disposed in the interior of the discharge pipe, one end met sewage treatment apparatus and a second air introduction pipe which opens to the projection port side of the discharge pipe,
Is disposed on the opening side of the water pump comprises a shielding member for covering the center of the opening side,
The shielding member includes
One end opening to the center of the opening of the water pump and the other end is connected to the first air inlet tube above the opening portion side of the upper Symbol submersible pump air sent from the first air inlet pipe A sewage treatment apparatus, characterized in that an intake air introduction section for supplying to the sewage is provided . In the storage tank, sewage treatment apparatus according to claim 1, characterized in that microorganisms have established a deposited carrier on the front surface.   The sewage treatment apparatus according to claim 1 or 2, wherein a water passage restriction piece protruding toward the second air introduction pipe is provided on an inner wall of the discharge pipe.   The sewage treatment apparatus according to any one of claims 1 to 3, wherein a heat insulating material is disposed around the septic tank.

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