JP4388855B2 - Processing tank for manure from livestock houses etc. - Google Patents

Description

  The present invention relates to a treatment tank having a function of easily treating sewage containing a large amount of manure discharged from a livestock barn such as a pig farm.

  In the treatment of manure from the barn, raw manure water is first stored in the raw water tank, and then supplied to a solid-liquid separator by a pump to separate it into solids and liquids such as feces and treat each of them. ing. The solid-liquid separation system of the vibration sieve system and the inclined screen system adopted in the conventional sewage treatment apparatus by the activated sludge method is configured by arranging an inclined mesh screen in the inclined opening of the hopper-shaped sewage receiver. By supplying raw water containing manure to the top of the screen with a pump and dropping it along the mesh screen, the liquid falls from the mesh of the screen and temporarily accumulates in the filtrate tank from the hopper-shaped sewage receiver, then the aeration tank To the next processing step. On the other hand, the solid content flows along the screen and falls from the lower end of the screen to the solid content storage pitch and is deposited. In the aeration tank, aeration is performed by an aerator, and sludge in the sewage is decomposed by activated sludge microorganisms. The aeration tank is generally provided with a fixed aerator. By blowing fine bubbles into the urine sewage with this aerator, the inside of the tank is agitated at a constant flow rate to keep the dissolved oxygen concentration in the tank constant, and the activated sludge microorganisms are removed. It is cultured and treated with sewage, but it takes about a week to meet the wastewater standards set by each local government.

  By the way, the activated sludge treatment which handles the sewage containing this kind of manure has conventionally required a large-scale facility, and it has required enormous costs for securing the land and the facility. For example, Patent Document 1 discloses that in the process of purifying livestock wastewater and the like, the control and management of the activated sludge concentration of the mixed liquid in the aeration tank can be performed easily and efficiently without complicated work. As a wastewater treatment system, a screen for removing solids from wastewater, a stirring tank for stirring wastewater treated with the screen, and an initial settling tank for removing residual solids of wastewater sent from the stirring tank An aeration tank that performs aeration treatment of wastewater sent from the initial settling tank and a solid-liquid separation process using a separation membrane; A sludge storage tank for aeration treatment and a filter press for dewatering sludge sent from the sludge storage tank are presented. The aeration tank stops aeration every predetermined time, and after aeration is stopped, it is allowed to stand for a predetermined time to precipitate activated sludge. It is controlled so as to repeat, and it is still a large scale in terms of equipment.

In such a situation, when an inorganic flocculant is added to the raw water, which is sewage containing animal organic matter, and stirred, the organic flocculant is added and stirred. The phenomenon of separation into water in the layers and intermediate layers and solid precipitate in the lower layers was discovered. Moreover, the water in the middle layer has reached the level that almost meets the emission standards. Recently, a method for rapidly treating sewage containing animal organic matter discharged in large quantities using this phenomenon as sludge has been developed. This processing method does not require a conventional large-scale facility and can be easily performed in the processing tank, but there is no processing tank suitable for this innovative processing method.
JP 2003-53364 A “Method and wastewater treatment system for controlling the activated sludge concentration of a mixed liquid in an aeration tank” published on February 25, 2003

  The problem to be solved by the present invention is that the conventional large-scale equipment is not required, and the above-described raw material for urine is made to react with the flocculant, and is separated into sludge and water and discharged separately. It is to provide a processing tank.

The manure processing tank of the present invention comprises a raw water inlet, an agitation means, an intermediate water outlet located at the tank middle layer position, a solid matter outlet means and a solid matter outlet located at the tank lower layer position. .
In order to further improve the function, the discharge position of the intermediate water discharge port is variable, the stirring means and the solid matter discharging means are combined with a screw structure, the bottom is a boat shape, the stirring means and the solid matter The screw structure that also serves as the discharging means is arranged at the bottom position of the ship, and the motor that drives the stirring means and the solid matter discharging means is installed in the upper part of the tank via the rotation transmission mechanism.

  The manure processing tank of the present invention comprises a raw water inlet, an agitation means, an intermediate water outlet located at the tank middle layer position, a solid matter outlet means and a solid matter outlet located at the tank lower layer position. Therefore, the flocculant can be uniformly mixed in the raw water by stirring means in this tank without the need for a large facility, and the agglomeration reaction is promoted, and the upper scum layer, intermediate layer water and lower layer water are effectively mixed. It can be separated from the solid sediment, the intermediate water can be easily discharged by the intermediate water discharge port arranged at the tank middle layer position, and the remaining sludge is discharged by the solid substance discharge means arranged at the tank lower layer position. It can be easily discharged from the outlet. The burden on the installer is greatly reduced because there is no need for large land and simple facilities.

In addition, by adopting a structure in which the discharge position of the intermediate water discharge port is variable, even if the water level of the separated middle layer fluctuates, it can respond to the water level at that time and reliably discharge the water to be discharged I can do it.
By adopting a configuration in which the stirring means and the solid matter discharging means are combined in a screw structure, stirring processing and separation / discharge can be performed with a simpler apparatus.
By adopting a configuration in which the bottom part is shaped like a boat and the combination of the stirring means and the solid matter discharging means is arranged at the bottom of the ship, the precipitated solids gather near the solid matter discharging means, so that sludge can be discharged effectively. .
By adopting a configuration in which a motor for driving the stirring means and the solid matter discharging means is installed in the upper part of the tank, the operating state can be easily detected from the outside, and the motor can be easily maintained and managed.

  The present inventor has drastically reformed the conventional wastewater treatment that requires a large-scale purification treatment facility, and dropped the flocculant directly into the raw manure raw water, and the upper scum layer, the intermediate layer water, the lower layer solid precipitate, We have developed a device suitable for implementing a new treatment method in which the separated material is discharged separately into solid sludge and liquid intermediate layer water. Basically, in the tank containing raw water, the function of mixing the flocculant to be added with raw water, the reaction proceeds and the solid and liquid are separated separately when the upper scum layer, intermediate layer water and lower layer solid precipitate are separated. Considering that it is required to have a function of discharging, first, the device is in the form of a tank, and necessary members are installed in the tank, and the raw water intake port, the stirring means, and the tank middle layer are arranged in the tank into which the raw water is taken. The intermediate water discharge port, the solid material discharge means disposed at the lower layer position of the tank, and the solid material discharge port.

  The raw water inlet does not need to be specially provided that it has an open part on the upper surface of the tank. Further, the flocculant may be added from this portion. As the stirring means, it is only required that the raw water in the tank is stirred as a whole, and an appropriate one can be adopted. The intermediate water outlet located at the tank middle layer introduces a water pipe into the tank and is installed so that its open end position is near the boundary with the sediment layer in the intermediate water layer. If this open end is located above the boundary with the sediment layer, the water between them remains in the tank, so this positioning is important. It is preferable to detect the boundary position with the sediment layer using a level gauge and adjust the opening end position of the discharge port. When the intermediate water is discharged, the upper scum layer descends and overlaps the lower solid precipitate, and remains in the bottom of the tank in a two-layer form. In order to discharge this solid matter remaining at the bottom of the tank from the tank, it is appropriate to dispose the solid matter discharge means in the vicinity of the bottom of the tank, and it is also appropriate to provide a solid matter discharge port in the vicinity of the bottom of the tank. . Any solid discharge means may be used as long as it pushes the solid toward the solid discharge port.

  An embodiment of the present invention will be described with reference to FIG. Reference numeral 1 denotes a tank body, and the bottom 1a has a ship bottom shape. A drain pipe 2 penetrates the tank body 1 and has an open end serving as an intermediate water discharge port 2a. In this embodiment, in order to make the height position of the intermediate water discharge port 2a variable, an L-shaped elbow structure is used, and the elbow 2b portion is a rotatable structure. By changing the rotation angle, the height position of the intermediate water discharge port 2a can be adjusted. The adjustment mechanism of the height position of the discharge port 2a is not limited to this, and the elbow tube may not be a rotatable structure, and may be performed by pulling out / pushing in as a swinging form. 3 employs a screw conveyer as the solid matter discharging means, but in this embodiment, it also serves as the stirring means to simplify the apparatus. Moreover, this screw conveyor 3 becomes a form where the twist direction of a screw reverses in a longitudinal direction. A motor 4 drives the screw conveyor 3 and is installed on the upper part of the tank body 1. In this embodiment, a 0.75 kW gear motor was employed. Reference numeral 5 denotes a transmission chain that transmits the rotation of the motor 4 to the screw conveyor 3, and 6 denotes a solid material discharge port provided at the center of the bottom 1 a of the tank body 1.

  A manure process performed using the apparatus of this embodiment will be described. As shown in the flowchart in FIG. 2, raw water introduction into the tank body 1 is started in step 1. In this embodiment, the raw water inlet is not specially provided and is introduced from an open portion on the upper surface of the tank. When the raw water introduction is started, the designated amount of the appropriate flocculant selected in Step 2 is charged and stirred, and this flocculant is also charged from the open portion on the upper surface of the tank. When charged, the motor 4 is driven, the screw conveyor 3 is rotated as a stirring means, the raw water is stirred and mixed well with the added flocculant, and the aggregation reaction is performed. After the agglutination reaction is completed, as step 3, the driving of the motor 4, that is, the stirring is stopped and the mixture is left for 30 to 40 minutes. Then, the scum layer is separated into the upper layer, the water is separated into the intermediate layer, and the precipitated solid is separated into three layers in the lower layer. In step 4, a level gauge is inserted from above the tank and the boundary position between the intermediate water and the sediment is measured. In step 5, the elbow 2b portion of the drain pipe 2 is rotated to adjust the height position of the intermediate water discharge port 2a to the measured boundary position, and then the intermediate layer water is discharged out of the tank through the drain pipe 2. When the intermediate water is drained, the upper scum layer is overlaid on the lower precipitated solid to form a laminated form. At this time, since the bottom of the tank body 1 is shaped like a ship bottom, the sludge formed by combining the upper scum layer and the lower layer sediment solids in the tank body 1 is naturally present in the deepest bottom 1a. To be collected. In step 6, the screw conveyor 3 as solid matter discharging means is driven to discharge sludge to the outside of the tank. The screw conveyor 3 is disposed in the longitudinal direction of the bottom portion 1a which is the deepest in the tank. The sludge to be collected is gathered around the screw conveyor 3. When the motor 4 is driven again in this state, the sludge is collected in the central portion by the operation of the screw conveyor 3 with the twist direction reversed, and this portion is provided with a solid material discharge port 6. When sludge is released, sludge is pushed out of the tank and discharged. The sludge remaining in the tank main body 1 in the process of discharging the sludge is collected in the vicinity of the screw conveyor 3 due to the boat-shaped shape of the bottom 1a, so that it is effectively discharged without remaining. The processing operation of this batch is completed by the above flow.

  FIG. 3 shows a specific example of adjusting the height of the intermediate water discharge port 2a. A has a drain pipe 2 having an L-shaped elbow 2b structure, and the elbow 2b portion can be rotated. By rotating the outer portion of the tank body 1, the height position of the discharge port 2a in the tank can be adjusted. It is something to change. The tip discharge port 2a may further have an elbow structure and a Z-shape similar to B. In the example shown in B, the height of the drain pipe 2 is adjusted by sliding up and down the rod attached to the movable pipe side with the L-shaped elbow 2b structure rising portion of the drain pipe 2 as a swinging configuration. . In this case, it is natural that the elbow 2b portion does not need to be rotatable. In both cases, the difference in position due to height adjustment is represented by ΔL.

It is a figure which shows one Example of the manure processing tank which concerns on this invention. It is a flowchart explaining the procedure at the time of performing sewage treatment using the apparatus of this invention. It is a figure which shows the specific example of the mechanism which adjusts the height of the intermediate water discharge port in the manure processing tank which concerns on this invention.

Explanation of symbols

1 Tank body 1a Bottom 2 Drain pipe 2a Intermediate water outlet
2b Elbow 3 Screw conveyor 4 Motor 5 Transmission chain 6 Solid material outlet

Claims (5)

  A manure treatment tank comprising a raw water introduction port, an agitation unit, an intermediate water discharge port disposed at a tank middle layer position, a solid material discharge unit and a solid material discharge port disposed at a tank lower layer position.   The waste water treatment tank according to claim 1, wherein the intermediate water discharge port has a variable discharge position.   The manure processing tank according to claim 1 or 2, wherein the stirring means and the solid matter discharging means have a screw structure.   4. The manure processing tank according to claim 3, wherein the bottom portion has a boat shape, and a screw structure that serves as both stirring means and solid matter discharging means is disposed at the bottom position of the ship.   The manure processing tank according to any one of claims 1 to 4, wherein a motor for driving the stirring means and the solid matter discharging means is installed on the upper part of the tank through a rotation transmission mechanism.

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