JP5094151B2 - Solid-liquid separator - Google Patents

Description

  The present invention relates to a solid-liquid separation device for separating and removing solid matter from sewage containing solid matter such as livestock manure and circulating water in aquaculture tanks.

Conventionally, as a method of treating livestock urine sewage, as shown in FIG. 5, 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. This decomposed urine sewage is adsorbed and separated by water pollutants in the filtration tank 57 and then discharged into a river or the like. In addition, the solid matter such as feces is reused as compost by, for example, separately fermenting it.
FIG. 6 is a diagram showing a configuration example of the solid-liquid separation device 55. The solid-liquid separation device 55 has a mortar-shaped solid-liquid separation tank 55a whose cross-sectional shape is substantially triangular and whose width decreases toward the lower part, and sewage for ejecting sewage such as manure into the solid-liquid separation tank 55a. An inflow pipe 55b and a filter 55c provided at the upper part of the solid-liquid separation tank 55a are provided, and the solid matter having a high specific gravity in the sewage sent into the solid-liquid separation tank 55a is the sewage inflow pipe. The swirl flow generated by the sewage ejected from 55b is carried to the bottom of the solid-liquid separation tank 55a and sent to the filth collection tank 60 from the discharge pipe 55d. On the other hand, the solid matter having a low specific gravity in the sewage floats on the upper part of the solid-liquid separation tank 55a and is captured by the filter 55c, so that the sewage that has passed through the filter 55c is taken out from the upper side of the solid-liquid separation tank 55a. By doing so, the sewage from which the solid matter has been removed can be sent to an aftertreatment facility such as the aeration tank 56 shown in FIG.
At this time, as shown in FIG. 6, the sewage sent from the upper part of the solid-liquid separation tank 55a through the filter 55c is provided with a pressure levitation purification device 70 in the subsequent stage of the solid-liquid separation device 55. If it is made to purify | clean, the fine solid substance in waste water which could not be removed with the said solid-liquid separator 55 can also be separated and removed.
The pressurized levitation purification device 70 feeds air from an air pipe (not shown) into a bubble ejection pipe 72 provided in the tank body 71 to eject the bubbles into the tank body 71, and causes the fine solid matter together with the bubbles. The water bubbles floated up to the liquid level of the tank body 71 and the fine solid matter floating on the liquid level of the tank body 71 is discharged from the discharge pipe 73 erected at the center of the upper tank body 71. The sewage from which the fine solid matter has been removed is taken out from the lower part of the tank body 71 and is an after-treatment step, in which an oxidation contact with anaerobic microorganisms attached to the surface is installed. It is sent to the tank 80 and further purified (see, for example, Patent Document 1).
JP 2005-230717 A

  However, even when the aeration process is performed by the pressurized levitation purification apparatus 70 in addition to the solid-liquid separation process by the solid-liquid separation apparatus 55, the filtration process of the sewage is performed only once. It was difficult to remove it sufficiently. In particular, the pressurized levitation purification apparatus 70 has a problem in that fine solids remain in the treated sewage after one filtration because fine solids adhere to the bubbles and float. . If the devices 55 and 70 are provided in a plurality of stages, it is possible to sufficiently remove the solid matter in the sewage, but the processing equipment is increased in size, which is a realistic method. Absent.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a solid-liquid separation apparatus that can reliably remove solid matter in sewage without increasing the number of apparatuses.

Invention of Claim 1 of this application is a solid-liquid separator which isolate | separates and removes the solid substance in wastewater, Comprising: The storage tank which stores wastewater, The submersible pump installed in this storage tank, An aeration pump provided with an air introduction pipe whose one end opens to the suction port of the submersible pump;
A solid-liquid separation tank installed at the upper part of the storage tank, a sewage inflow pipe for ejecting sewage containing bubbles sent from the aeration pump into the solid-liquid separation tank, and a solid-liquid separation tank A water bubble recovery pipe that opens to the liquid level of the solid-liquid separation tank and collects water bubbles floating on the liquid level of the solid-liquid separation tank; and sewage that collects sewage near the liquid level of the solid-liquid separation tank Than the recovery pipe, the screen for filtering the sewage collected by the sewage recovery pipe, the sewage return means for returning the sewage filtered by the screen to the storage tank, and the sewage inflow pipe in the solid-liquid separation tank A treated water discharge pipe is provided on the upper side and on the lower side of the sewage recovery pipe.
The invention according to claim 2 is the solid-liquid separator according to claim 1, wherein either one or both of the sewage collected at the bottom of the solid-liquid separation tank and the sewage recovery pipe is provided as a solid with a filter. It is made to return to the said storage tank through a material separator.

According to the present invention, from a storage tank for storing sewage, using an aeration pump, sewage containing a large number of bubbles is sent to a solid-liquid separation tank, and solid matter having a high specific gravity is discharged from the bottom of the solid-liquid separation tank. The water bubbles attached to the solid surface of the solid-liquid separation tank with light solid matter floating on the liquid surface are collected by the water bubble recovery pipe that opens to the liquid surface in the solid-liquid separation tank, and in the vicinity of the liquid surface of the solid-liquid separation tank The sewage recovery pipe is provided to collect the sewage at the upper part of the solid-liquid separation tank, and the sewage collected by the sewage recovery pipe is returned to the storage tank through the screen while being above the sewage inflow pipe and the above-mentioned Since the treated water take-off pipe provided below the sewage collection pipe is used to take out the sewage from which the fine solids have been sufficiently removed, the solids in the sewage can be removed without increasing the number of devices. It can be removed sufficiently.
In addition, if one or both of the sewage collected at the bottom of the solid-liquid separation tank and the sewage collected by the water bubble recovery pipe is returned to the storage tank via a solid substance separator equipped with a filter, the waste is discarded. Since the amount of sewage can be reduced, sewage can be efficiently separated into solid and liquid.

Hereinafter, the best mode of the present invention will be described with reference to the drawings.
1 and 2 are diagrams showing the configuration of a solid-liquid separation device 10 according to the best mode of the present invention. In each figure, 11 is a storage tank for storing sewage such as urine sewage, and 12 is the storage tank 11. The solid-liquid separation tank installed in the upper part, 13 is an aeration / water discharge pump apparatus installed in the storage tank 11, and 14 is the solid-liquid separation tank 12 for removing sewage containing bubbles discharged from the aeration / water discharge pump apparatus 13. A sewage inflow pipe to be ejected into the inside, 15 is a water bubble collection pipe installed in the solid-liquid separation tank 12, 16 is a sewage collection pipe provided near the liquid surface of the solid-liquid separation tank 12, and 17 is the sewage collection pipe. A screen settling tank for storing the sewage collected by the pipe 16, 18 is a screen device having a fine or fine screen body 18a, and 19 is a solids separator having a filter 19a made of nonwoven fabric or the like. The sewage recovery pipe 16, the screen settling tank 17 and the screen device 18 constitute sewage return means for returning the sewage in the solid-liquid separation tank 12 to the storage tank 11.
In addition, in each figure, the code | symbol 10a is a sewage supply pipe | tube which supplies process wastewater in the said storage tank 11, 10b is a process water extraction pipe | tube which takes out the solid-liquid separated sewage in the said solid-liquid separation tank 12. FIG.
The solid-liquid separation tank 12 has a cylindrical shape on the upper side and a semiconical shape with the bottom side opened upward. The region having the tapered portion 12a on the lower side from the upper surface of the half cone is the solid precipitation region 12A, the region of the upper cylindrical portion is the aeration region 12B, and the solid discharge pipe 12b is provided at the bottom of the tapered portion 12a. ing.
The sewage inflow pipe 14 is provided in the vicinity of the boundary between the two regions 12A and 12B, that is, in the vicinity of the upper surface of the tapered portion 12a. Further, the treated water outlet pipe 10b for taking out the sewage separated into solid and liquid in the tank is provided above the sewage inflow pipe 14 and below the sewage recovery pipe 16.
As shown in FIG. 3, the aeration / water discharge pump device 13 includes a motor 13M, a screw blade 13k rotated by the motor 13M, and a discharge pipe 13n provided on the feed side of the screw blade 13k. A pump 13a, a mounting member 13b for mounting the motor 13M, and an intake pipe 13c having one end opened in the air and the other end opened in a suction port of the motor 13M. Is supplied to the vicinity of the center of the opening of the submersible pump 13a, and sewage mixed with a large number of bubbles is ejected from the sewage inflow pipe 14 into the solid-liquid separation tank 12.
The water bubble recovery pipe 15 is provided with an opening 15a that opens near the liquid surface of the solid-liquid separation tank 12, and at the bottom thereof, the sewage that has flowed into the recovery pipe 15 from the opening 15a is solid. A transfer pipe 15b for sending to the separator 19 is installed.
The sewage recovery pipe 16 transfers sewage near the liquid surface of the solid-liquid separation tank 12 to the screen settling tank 17, and the sewage overflowing from the screen settling tank 17 passes through the screen body 18a of the screen device 18. And returned to the storage tank 11.

Next, the operation of the solid-liquid separation device 10 having the above configuration will be described.
First, sewage to be subjected to solid-liquid separation processing is put into the storage tank 11 by the sewage supply pipe 10a. Then, the motor 13M of the aeration / discharge pump device 13 is driven to operate the submersible pump 13a, and the sewage stored in the storage tank 11 is sent to the sewage inflow pipe 14 and ejected into the solid-liquid separation tank 12. When the screw blade 13k of the submersible pump 13a rotates, the sewage in the storage tank 11 is drawn into the suction side of the submersible pump 13a, so that a large negative pressure is generated near the suction port of the submersible pump 13a. Therefore, air in the atmosphere is supplied to the vicinity of the suction port from the suction pipe 13c that opens near the suction port of the submersible pump 13a, and is entrained and mixed in the sewage. Thereby, sewage mixed with a large number of bubbles is discharged from the discharge pipe 13 n of the aeration / discharge pump device 13, and is ejected into the solid-liquid separation tank 12 through the sewage inflow pipe 14.
The solid matter having a high specific gravity contained in the sewage in the solid-liquid separation tank 12 is caused by the swirl flow generated by the sewage ejected from the sewage inflow pipe 14 in the solid matter precipitation region 12A. It is conveyed to the bottom of the separation tank 12 and sent to the solid separator 19 from the solid discharge pipe 12b. In the solid substance separator 19, after separating the solid substance with heavy specific gravity in the waste water with the filter 19a, the waste water is returned to the storage tank 11 via the waste water discharge pipe 19b.

On the other hand, in the aeration area 12B, fine solids having a low specific gravity such as fiber material are carried to the upper part of the solid-liquid separation tank 12 by the bubbles ejected from the sewage inflow pipe 14 together with the sewage. The liquid level of the tank 12 is in a state in which a large number of water bubbles with the fine solid matter attached thereto float. These water bubbles flow into the tube from the opening 15a of the water bubble recovery tube 15, and sewage containing the collected fine solid matter is stored at the bottom thereof.
The sewage near the liquid surface of the solid-liquid separation tank 12 is sent to the screen settling tank 17 through the sewage recovery pipe 16. The sewage overflowing from the screen sedimentation tank 17 is returned to the storage tank 11 through the screen body 18a of the screen device 18 as shown in FIG. On the other hand, the sewage containing fine solids falling on the screen body 18a flows into the solids separator 19 from the guide plate 18b provided at the lower part of the screen body 18a. After being separated by the filter 19a, it is returned to the storage tank 11. The fine solid matter in the sewage collected in the screen settling tank 17 is removed by passing through the screen body 18a or the filter 19a and then returned to the storage tank 11. The sewage at the bottom of the screen sedimentation tank 17 is mixed with a solid material having a large specific gravity that could not be removed by the solid-liquid separation tank 12. After the solid matter in the sewage is separated from the solid matter discharge pipe 17b provided at the bottom of the sewage and separated in the sewage, it is returned to the storage tank 11 from the sewage discharge pipe 19b.
Further, in this example, a transfer pipe 15b communicating with the bottom of the water bubble recovery pipe 15 is provided, and the sewage collected at the bottom of the water bubble recovery pipe 15 is sent to the solid matter separator 19, and the sewage is filtered by the filter 19a. These fine solids are separated and then returned to the storage tank 11.
The sewage returned to the storage tank 11 is again sent to the solid-liquid separation tank 12 by the aeration / discharge pump device 13 and separated into solid and liquid.
In this example, the solid matter having a large specific gravity or the fine solid matter in the sewage is circulated while being removed by the screen body 18a of the screen device 18 or the filter 19a of the solid matter separator 19 as described above. The sewage on the lower side of the region 12B contains almost no solid matter. Therefore, the sewage from which the solid matter is sufficiently separated can be taken out from the treated water outlet pipe 10b.

  As described above, according to the best mode, the lower semi-conical region (solids precipitation region 12A) and the upper cylindrical region are provided on the upper portion of the storage tank 11 for storing sewage such as urine sewage. A solid-liquid separation tank 12 having (aeration area 12B) is installed, and in the aeration water discharge pump device 13, a large number of bubbles are mixed with the sewage in the storage tank 11 and ejected into the solid-liquid separation tank 12. In the solid matter precipitation region 12A, the solid matter having a high specific gravity is collected in the lower part of the solid-liquid separation tank 12 and sent to the solid matter separator 19 to remove the solid matter and return to the storage tank 11. On the other hand, in the aeration region 12B, the water bubbles to which the fine solid matter having a light specific gravity floating on the liquid surface of the solid-liquid separation tank 12 is attached are recovered by the water bubble recovery tube 15 and the sewage near the liquid surface is recovered by the waste water recovery tube 16. After that, the fine solid matter is removed and returned to the storage tank 11 by the solid matter separator 19 and the screen device 18, respectively. Then, as described above, while circulating the sewage, the sewage from which the solid matter in the solid-liquid separation tank 12 has been separated is taken out from the treated water outlet pipe 10b provided on the lower side of the aeration region 12B. Therefore, the sewage can be sufficiently solid-liquid separated without increasing the number of devices.

The sewage collected at the bottom of the solid-liquid separation tank 12 and the sewage collected at the bottom of the water bubble recovery pipe 15 or the sewage at the bottom of the screen settling tank 17 are disposed in the sewage collection tank as in the conventional case. Although it may be discharged and processed, it is possible to reduce the amount of waste water to be discarded by solid-liquid separation with the solid separator 19 and then returning to the storage tank 11 as in this example. it can. Moreover, since all the separated solid matter is collected on the filter 19a of the solid matter separator 19, the waste water can be efficiently separated into solid and liquid, and the processing equipment can be simplified.
In addition to the filter 19a, the solid matter separator 19 can be provided with other solid matter separating means such as a punching plate and a hexagonal honeycomb block, so that the solid matter can be reliably separated from the sewage. it can.
In the above example, the solid separator 19 is provided adjacent to the solid-liquid separation tank 12, but the arrangement of each facility is not limited to this, and the solid-liquid separation tank 12 is located below the solid-liquid separation tank 12. It may be determined as appropriate according to the installation location of the equipment, such as being installed at the top of the storage tank 11.
In the above example, the sewage to be subjected to the solid-liquid separation process is directly introduced into the storage tank 11 from the sewage supply pipe 10a. However, the sewage is introduced into the storage tank 11 through a solid separator such as a screen or a filter. May be.

  According to the present invention, since solids in sewage can be sufficiently separated without increasing the number of devices, in addition to equipment for separating and removing solids in urine sewage, it is included in the circulating water of the aquaculture tank. By applying it to a solid-liquid separation device or the like for separating and removing feces and urine, residual sewage can be efficiently treated.

It is sectional drawing which shows the structure of the solid-liquid separator which concerns on the best form of this invention. It is a top view which shows the structure of the solid-liquid separator which concerns on the best form of this invention. It is a figure which shows the structure of an aeration water discharge pump apparatus. It is a side view of a screen and a screen settling tank. It is a figure which shows the conventional sewage treatment method. It is a figure which shows one structural example of the conventional solid-liquid separator.

Explanation of symbols

10 solid-liquid separator, 10a sewage supply pipe, 10b treated water take-out pipe, 11 storage tank,
12 solid-liquid separation tank, 12A solid matter precipitation area, 12B aeration area, 12a taper part,
12b Solid matter discharge pipe, 13 Aeration / water discharge pump device, 13a Submersible pump,
13b mounting member, 13c intake pipe, 13M motor, 13k screw blade,
13n discharge pipe, 14 sewage inflow pipe, 15 water bubble recovery pipe, 15a opening,
15b transfer pipe, 16 sewage recovery pipe, 17 screen sedimentation tank,
17b Solid matter discharge pipe, 18 screen, 18a Screen body, 18b Guide plate, 19 Solid matter separator, 19a Filter, 19b Sewage discharge pipe.

Claims (2)

An aeration pump provided with a storage tank for storing sewage, an underwater pump installed in the storage tank, and an air introduction pipe whose one end opens to the suction port of the submersible pump;
A solid-liquid separation tank installed at the upper part of the storage tank, a sewage inflow pipe for ejecting sewage containing bubbles sent from the aeration pump into the solid-liquid separation tank, and a solid-liquid separation tank A water bubble recovery pipe that opens to the liquid level of the solid-liquid separation tank and collects water bubbles floating on the liquid level of the solid-liquid separation tank; and sewage that collects sewage near the liquid level of the solid-liquid separation tank Than the recovery pipe, the screen for filtering the sewage collected by the sewage recovery pipe, the sewage return means for returning the sewage filtered by the screen to the storage tank, and the sewage inflow pipe in the solid-liquid separation tank A solid-liquid separation device comprising: a treated water extraction pipe provided on an upper side and a lower side of the sewage recovery pipe.   Either or both of the sewage collected at the bottom of the solid-liquid separation tank and the sewage collected by the water bubble recovery pipe are returned to the storage tank via a solid separator equipped with a filter. Item 2. The solid-liquid separator according to Item 1.

Images