JPS58207996A - Aeration tank - Google Patents

Abstract

PURPOSE:To subject the excretion matters of cattle to the optimum aeration process, by arranging a plurality of aerating means along the same direction in line with the circumferential direction of a slurry tank in a manner such that they cross a circumferential direction in the slurry tank and incline toward the center of the slurry tank, and providing a defoaming means. CONSTITUTION:A liquid containing crude excretion matters of cattle in a sub pit 5 is sent through a spouting pipe 9 and a liquid-supply pipe 11 into a slurry tank 4. When the slurry tank 4 is filled with water in winter, a vertical shaft pump 8 is intermittently driven, and a gate valve 6 is also intermittently opened or closed in response to the operation of the vertical shaft pump 8. By the operation of an aerating means 14, a gas-liquid mixture is let flow as shown in C, so that an amount of air necessary for aerobic fermentation is supplied to the excretion matters of cattle in the slurry tank 4 in the level of from the bottom of the vessel to the surface of the liquid. Bubbles formed by the aeration is defoamed by the operation of a defoaming machine 21. Said machine 21 may be intermittently driven, when the bubbles are formed to an unrising extent.

Description

[Detailed description of the invention] Regarding the 4-air tank of the laboratory equipment.

Conventionally, in order to process cow manure, a bit is installed underground to perform aeration and turn it into liquid fertilizer. There is only one cow;
SO- of cow dung is discharged every day. In Hokkaido, it is common to raise large numbers of cows, and it is now common to raise large numbers of cows.
It takes one day to raise o cows! Tun excrement is generated. The excreta treatment tank is selected from a tank with a capacity of 200 to 1000 tons. Therefore, the excreta treatment tank is large-scale, and in Hokkaido, where land is relatively easy to use, above-ground excrement treatment systems using above-ground tanks are often used due to the price of the excrement treatment tank.

Conventionally, it was used as an above-ground manure treatment system. The above-ground D slurry tank is connected to the sub-pinto via a gate valve via a gravity-flowing liquid-feeding pipe from the above-ground slurry tank, and the sub-pinto is equipped with a liquid-feeding pump. It is equipped with pipes for discharging liquid fertilizer to the slurry lorry, and the above-ground slurry tank is equipped with a surface aeration system. In addition, the manure liquid sent from the sub-focus is connected to a V-port pipe that opens at the bottom of the slurry tank. With the surface aeration device of such conventional above-ground excrement processing equipment, the force of stirring the excrement in the slurry tank is weak, the agitation radius is small, and the agitation does not reach the bottom of the tank. It is necessary to compensate for the lack of stirring power by sending the manure liquid to the slurry tank and using the ejection force of the manure. However, the force of the liquid ejected from the opening of the pipe, which is sent by the aforementioned pump and opens at the bottom of the slurry tank, only partially stirs the liquid around the spout, and the liquid other than the surface of the tank is agitated. Both the heat and the aeration are extremely weak. Moreover, during the severe winter, the surface blower system cannot provide sufficient stirring aeration, and the outside air (at least one θ°C to -30°C)
Due to the influence of this, the temperature is not suitable for fermentation of aerobic bacteria, and in the end, surface aeration does not play any role in biochemical treatment, and therefore the generation of fermentation heat is negligible. The liquid level inside the slurry tank will then freeze due to the outside air. Therefore, when it is time to fertilize pastures in the first spring, manure as fertilizer has not been liquefied and cannot be spread due to freezing, which has hindered the operation of above-ground manure treatment systems.

In contrast to these conventional systems, an above-ground excreta treatment system has been developed which is equipped with an underwater aeration device at the bottom of the slurry tank and a defoamer at the top of the above-ground slurry tank. According to this device, conventionally during the severe cold season (minimum temperature -2θ℃~-3℃)
At θ°C), the liquid level in the slurry tank froze, and the ice did not thaw even when fertilizer should be applied in the spring, resulting in a thick layer of ice. It has a removable effect. The temperature of the second rally tank changed as shown in FIG.

In FIG. 1, the horizontal axis shows the number of days, and the vertical axis shows the temperature and exposure'gA1.

The symbol l indicates the temperature of the manure in the slurry tank, and the location where the depth of the liquid fell at this temperature was also the same. That is,
, it has been indirectly shown that the stirring is optically efficient. The symbol ko is @air volume -/hr, the symbol 31 is a line showing the 8 temperature of the outside air.

In the nullary tank shown in FIG. 3, a submersible 4-air system is operated. In this operation method, at the beginning of the liquid fertilizer fermentation process, aerobic seed bacteria are first produced, and the operation is close to continuous operation for the purpose of further rapid multiplication. Such continuous operation during the V period is also useful for reducing the viscosity of the highly viscous raw solution (feces) by aeration, and for forming convection currents in the slurry tank through effective stirring.

FIG. 2 is a diagram showing the decrease in the viscosity of the raw manure water in the slurry tank, where the horizontal axis shows the number of days of operation of the 4-air device and the vertical axis shows the viscosity 4CPi of the θ manure in the slurry tank. Line A
As shown in
The feces and urine of Kashira 1i rapidly decreases to about goCP K, and after that there is little change. Therefore, in the early stage of liquid fertilizer production, continuous operation is performed to lower the viscosity, so that enough air is mixed into the manure, and the number of aerobic bacteria increases.

This operation continues (as fermentation progresses and the liquid temperature rises. At the same time, the viscosity decreases significantly, and the stirring flow effectively convects inside the slurry tank, causing the dl in the water to increase.
The oxygen supplied by the ejector/6 of the gas equipment holder is distributed throughout the slurry tank. When the liquid temperature rises to a certain extent, the aerobic bacteria become significantly activated, and even when switching to intermittent operation, the liquid temperature rises close to that of continuous operation. (Underwater aeration!! Because there are many types of air that are directly supplied) This is because the underwater aeration device 1 mentioned above is
At 4t, the air supplied by the ejector 16 is already in continuous operation, turning into fine bubbles, which are agitated from the bottom of the tank to every corner of the slurry tank, which improves the efficiency of dissolving the manure into the slurry and allows it to last for a long time throughout the respiration of aerobic bacteria. This is because time is stuck.

As mentioned above, the new manure treatment equipment t, which is equipped with a 4-air device at the bottom of the above-ground slurry tank and a defoamer above the tank liquid level, generates temperatures of over 40°C even in the coldest season. It has been proven that rottenness progresses.

However, it has been found that the effect of aeration differs depending on the arrangement of the aeration device at the bottom of the slurry tank, and the slow rate of ripening of cow manure and the rise in temperature inside the slurry tank differ.

The purpose of the present invention is to submerge an above-ground slurry tank equipped with a 4-gas tank to achieve optimal aeration in a manure treatment system equipped with an aeration system at the bottom of the slurry tank.
j-ru.

The present invention is based on the 11I of the bottom of a cylindrical above-ground slurry tank.
The center of the slurry tank is located close to the center of the slurry tank. Tilt to II and circumferential direction? The slurry tanks are arranged in the same direction as above, and the defoaming means is enclosed in the upper part of the above-ground slurry tank.

The submersible system of the present invention is preferably equipped with a non-obstructive submersible pump.

A suitable defoamer for the underwater aeration system of the present invention is installed above the water surface between the peripheral wall of the slurry tank near the aeration system and the jet center of the aeration system.

Embodiments of the present invention will be described below according to the drawings.

Three pictures!・This is a vertical cross-sectional view. The above-ground slurry tank dam and the underground sub-bit j are connected through a gate valve 6 to a liquid feed pipe 7 that opens into the sub-bit S so that the cow's waste in the sub-pit is fed to an axle slurry pump. 1 and discharged into the discharge pipe 9. The axle slurry pump t can also be a submersible pump. The cow manure discharged from the discharge pipe 9 is sent to the slurry tank through the liquid supply pipe 9, which is branched from the discharge pipe 9 and connected to the liquid manure take-out pipe 3 through the stop valve 1. An aeration device L is provided at the bottom of the above-ground slurry tank q.

The aeration device IL/e is a submersible motor pump/! The ejector 16 has a nozzle at its discharge port, an air chamber at the nozzle outlet end, and a diffuser at the tip of the air chamber so as to be in line with the nozzle. It is equipped with an air inlet ftt opening into the °C atmosphere via a silencer/1.

The aeration device is located at the bottom of the slurry tank and is
An air system is fine, but for excrement treatment, it is necessary to combine the voltenx pump and ejector to
an ejector fluidly connected to the pump, the ejector being configured to include a nozzle to which liquid from the pump is supplied, and a device surrounding the nozzle for discharging gas. It is composed of an air chamber in which an air pipe for introducing air is opened, and a diffuser through which the liquid ejected from the nozzle passes, and is equipped with an impeller whose front side is open, and has blades, A pump that forms a swirl chamber with a space between the suction ports from the front surface of the rat wheel open gA, and a discharge port is provided in the space in order to maintain the swirling force of the fluid obtained by the pump at the nozzle part. The aeration device (4 Hall
1 (3tt-tza!rsis) is suitable.

According to the aeration device related to this patent Im, the swirling flow of the pump is maintained through the nozzle to the air chamber and the diffuser, so the amount of air intake increases significantly.Since it is a portex pump, solids can also be removed from the slurry tank 4. The solids can be circulated through the aeration device, and the solids are ejected together with the liquid, and the aeration effectively acts on the liquid content and composition to be treated.

A defoaming machine 1 is arranged above the slurry tank q.

In the defoaming machine 1, a bearing bracket 3 is attached to the beam passed between the upper edges of the slurry tank holder, and a motor holder is attached to the bearing bracket 3.

The rotating shaft is supported so as not to move in the axial direction by a bearing (not shown) mounted on the bearing bracket 3, and the rotating shaft and the motor shaft are connected by a shaft coupling (not shown), and a material suitable for removing bubbles, for example, is attached to the end of the rotating shaft. Semi-open impeller! Install.

Effect of anti-foaming Isoko 1 The foam rises to the bottom of the impeller 2 and 25, but the foam is liquefied and blown away by the impeller 3. Therefore, bubbles are extinguished in a certain range, and bubbles remain from the liquid level of the nullary tanker to the impeller S, but the bubbles do not rise any further.

In addition, in a foam cutting device which is composed of a motor and a foam cutting cutter as a defoamer, an opening that communicates with the outside air to the motor and an opening that communicates with the air chamber of the aeration device are provided, and the gap between the two openings is sealed. Foam cutter [1 (Yikuaki, t4-079 Dakuko No.)], which is characterized by forming an air passage through the inside or outside of the frame and cooling the motor by the suction action of the aeration device, can be used as a defoamer. Since the heat generated by the motor is used to warm the incoming air and the motor is cooled, the air introduced by the aeration device is heated, which is convenient for promoting fermentation. When this defoamer is used, the air introduction pipe 19 of the aeration device 1 is connected to the defoamer unit 1.

The bottom roller of the slurry tank pavilion constructed in this manner is made of concrete, the peripheral wall core is cylindrical and has a steel plate structure, and the peripheral wall is provided with necessary reinforcing ribs (not shown). The outer periphery of the peripheral wall 17 is covered with a heat insulating material, and a roof (not shown) is provided above the slurry tank to keep the slurry tank warm.

FIG. 4I is a plan view of the idle tank, showing the aeration system [t
14I and the arrangement of defoaming machine 1. In this embodiment, the aeration device 1 and defoamer 1 are each provided with a stand.

The aeration device L is arranged symmetrically close to the peripheral wall core of the slurry tank pavilion so that the centers of the jets from the ejector 16 face in opposite directions and are parallel to each other. And defoaming machine
is arranged between the jet center t of the ejector l and the peripheral wall near the jet center g of the slurry tank. The beam supporting the defoaming machine A/I is arranged so as to pass above the 4 air units A/DA. By arranging the beams in this way, the aeration device/lI, the defoaming rock, the defoaming rock electrical wiring, and the air introduction pipe/9 are supported by one beam, and the aeration equipment is placed at the bottom of the tank. It is convenient because it serves as a support member for the cargo handling equipment that is lowered and pulled up from the bottom of the tank.

The orientation of the arrangement of the slurry tank 4 of the 4-air device/41 to [E] is such that the aeration device/g is placed close to the surrounding wall 27 with the center of symmetry being the center Z of the circle of the surrounding wall of the slurry tank pavilion.
The center of the submersible pump of the aeration system Wtll is arranged so that it intersects with the circumference of a circle J centered on the center Z of the slurry tank, and the circumference faces in the same direction. That is, the ejector/A) is oriented toward the center of the slurry tank at an angle of 6 to the junction of the three circles at the center of the submersible pump.

The ground-type excrement processing apparatus of the present invention configured as described above operates the axle pump and sends the liquid containing cow excrement raw water in the sub-focus S to the slurry tank via the discharge pipe 9 and the liquid feed Ml/. It will be done. Unless the slurry tank is full, the raw water in Subpinto S is transferred to the slurry tank. When the winter slurry tank is full of water, the axle pump g is operated intermittently, and the gate valve 6 is also intermittently opened and closed in accordance with the operation of the chamber shaft pump g. In this way, Subpinto S is agitated by the liquid exiting the gate valve t, promoting the mixing of aerobic bacteria. Since the raw water content of cow manure in Subit S is high, organic matter is supplied to the slurry tank in Subit 5.

Submersible aeration equipment at the top of the slurry tank/Tano operation has already been carried out.
・Due to the reasons mentioned above, it was operated continuously at first, and then intermittently.

When the aeration equipment is operated, the gas-liquid mixture flows as shown by symbol C in Figure 3. Therefore, the cow manure in the slurry tank Hironaka is filled with the air necessary for aerobic fermentation from the bottom of the tank to the liquid surface. supplied without any restrictions. - Fresh organic matter from the cow manure is supplied to the liquid surface of the slurry tank from the ends of the feed g, f//, gradually moves downward, and is sent from the bottom of the tank to the sub-bin (j) via the liquid feed pipe 7 for circulation. do. When aeration is performed, bubbles are generated on the liquid surface. When these bubbles are released, they begin to overflow over the upper edge of the slurry tank. Then, the defoaming machine 1 is operated. The anti-foaming Isocol may be operated intermittently as long as the foam does not rise.

- 10,000, aeration system 7! The air and water ejected from the ejector 16 of /4' corresponds to the sag 1 in the plan view of FIG.

As shown by E, the jet spreads from the center -t of the ejector/6 to the flower stand. Looking at the direction of the jet stream from the 4-aeration device L, the flow that splits to the right is E, and the flow to the left is E, the flow D that deflects and crosses to the center 11 of the slurry tank pavilion, and the flow D from both aeration devices. The jets mutually support each other to generate a vortex, and the jet center 1s moves straight forward, but is somewhat deflected toward the flow D side.

The flow E to the peripheral wall core 1111 of the slurry tank pavilion tends to return due to the flow due to the suction of the steam equipment f/da.
Also, the center of the jet is moving straight, while the other aeration devices are arranged symmetrically to the side 11, generating a tear jet. be sucked into. And these flows DS
B rotates on a slow vortex of high speed centered on the center Z of the 7 Rally Tanker. If you look at arrows C, D, and A in Figures 3 and 4, you can see that the horse manure in the nullary tank q is stirred and supplied with air.Therefore, aerobic bacteria The decomposition process was carried out completely on the cow manure in the nullary tank,
Less biased.

As is already well known, bubbles appear above the liquid surface rather than in the manure. Therefore, a lot of foam is generated directly above the ejector surface of the aeration device, but the foam only swells up in that area, and instead spreads over the liquid space to form a foam layer.

Therefore, in order to maintain a consistent foam layer during the experiment, a defoaming machine 1 was placed in the already-prepared space 5, as shown in Figure 7-m9. When the city foam machine is operated, the two-dot chain line F
(Fig. 3) The antifoaming effect reaches inside. The bubbles that touch the impeller are liquefied and are blown away by centrifugal force from the impeller.
As it flies, it liquefies other bubbles. Therefore, the aeration device t14
When the foam is continuously generated and the defoaming machine is operated.
When operated, a concave foam surface centered on the defoaming machine 1 is created. Therefore, since the defoamer-J/ is arranged between the peripheral wall of the slurry tank pavilion and the jet center 1 of the ejector 16, the foam does not overflow beyond the periphery of the slurry tank pavilion. And due to the nature of defoaming, the impeller is
Bubbles below 23 do not disappear, so the slurry tank is closed.

The urine surface is reliably covered with foam and kept warm.

The ms diagram shows another embodiment of the present invention, and is a plan view of an above-ground slurry tank.In this embodiment, an aeration device/
There are three das arranged. The arrangement is the same as in the previous embodiment, and the aeration device/da is arranged close to the peripheral wall of the slurry tank pavilion with the center 2 of the slurry tank pavilion as the center of symmetry.

Aeration device! The orientation of the arrangement of the slurry tank q on the bottom roller of /4' is the aeration system with the center Z of the circle of the peripheral wall core of the slurry tank bow as the center of symmetry. submersible pump/! The ejector 16, which is arranged so as to intersect the circumferences of the three circles centered on the center Z of the slurry tank, and face the same direction in the same direction, Circle at the center of the pump3. : It forms an angle θ with respect to the tangent line of 1 and faces toward the center of the slurry tank pavilion.

The action in FIG. 1 is the same as in the embodiment shown in FIG. 4, where the jet flow center 2g from the center travels straight and flows left and right.

E, the central flow goes straight and is deflected toward the center, and the flow becomes D.
mutually assist to produce a vortex, and the flow E is partially returned to its original state by the suction flow of the aerator Lda. And the entire slurry tank visit was 4! In figure f, the whole flow is a clockwise vortex flow, and the flow is slow. Since the vertical flow distribution already has the flow C shown in FIG. 3, the manure liquid in the slurry tank tank is sufficiently agitated and aerated.

The antifoaming machine is also arranged in the same manner as shown in FIG. 4 and produces the same effect.

As described above, the above-ground slurry tank of the present invention has a plurality of aeration devices arranged symmetrically with the center of the slurry tank as the center of point symmetry at the bottom of the cylindrical above-ground slurry tank at a position close to the inner periphery of the peripheral wall. Since the aeration system is circular with the center of the tank as its center, and the center of the aeration system is tilted toward the center with respect to the tangent at t, the aeration air acts thoroughly on the manure liquid in the slurry tank, and also agitates. This is done without leaving any remaining parts to be treated.

Since the defoamer is placed above the liquid level in the slurry tank between the jet center of the aeration device and the peripheral wall of the slurry tank near the side of the jet center, the foam generated from the feces is appropriately defoamed and the slurry is The slurry tank will not overflow, and since a foam layer remains on the surface of the feces in the slurry tank, it has good heat retention and helps promote fermentation of the feces.

In the above embodiments, one and three aeration devices/41 are used, but the same applies to the case of more than one aeration device/41, and the defoamer is arranged in the same way. Although the arrangement of the aeration equipment is expressed in a geometrically accurate manner in the embodiments, the reference positions and directions are shown in each case, and a slightly displaced arrangement is allowed.

Brief explanation of disease diagrams □ Figure 1 is a diagram showing the temperature change over time in a slurry tank of cow manure, Figure 2 is a diagram showing the viscosity of manure in the slurry tank, and Figure 3 is a diagram showing the above-ground type. Vertical of excrement processing equipment! The IT surface diagram and Figure D show an embodiment of the non-invention.
A partial plan view of the figure, fJXI, is a plan view showing another embodiment of the present invention.

/...Indicates temperature? fs Ko... Aeration amount 3...
・ISE showing 8 temperature of outside air...Slurry tank 5・
・Sub focus 6...Gate valve ri...Liquid pipe
g... Chamber shaft slurry pump!・・・Discharge pipe //・
...Liquid feed pipe lko...Stop valve is...Liquid fertilizer take-out pipe
lda...Anaerobic equipment /&...Submersible motor pump/
A... Ejector 17... Gate valve /1... Silencer /9... Air introduction pipe Here... Defoaming machine Here...
・Beam Co3...Bearing bracket Core...Motor -! ... Cutter 26 ... Tank bottom Core ... Peripheral wall
, 2g... Center of the jet 3... Yen.

Applicant: Ebara Corporation Figure 4 of the new department Figure 5 5

Claims (1)

[Claims] l A plurality of aeration devices are arranged symmetrically or almost symmetrically with the center of the aeration tank as the center of point symmetry at a position close to the inner circumference of the peripheral wall of the bottom of the cylindrical aeration tank, and the center of the aeration tank is set as the center of point symmetry. The direction of the ejector was tilted toward the center of the 4-air tank with respect to the tangent line drawn at the position of the aeration equipment of the circle passing through the aeration equipment as the center, and an underwater aeration equipment was installed, and one defoamer was installed above the aeration tank. Cylindrical aeration tank. A defoaming device is disposed above the liquid level of the aeration tank between the jet center on the extension of the ejector center and the peripheral wall of the aeration tank near the side of the jet center. Cylindrical aeration tank 0 described in A.1