JPS6315040B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to livestock manure processing equipment.
Recently, composting equipment for livestock manure has been put into practical use in order to process livestock manure and easily obtain organic fertilizer. Furthermore, prior to composting, wet livestock manure mixed with urine and washing water is processed into a dehydrator. However, dehydration and humidity control to a state that facilitates fermentation has become common practice.
Secondary pollution occurs due to wastewater from the squeezing water separated during dehydration and humidity control processing. To prevent this secondary pollution, detoxifying squeezing water wastewater requires a huge amount of equipment and expense. The spread of dehydration treatment for livestock manure is stagnant.

An object of the present invention is to provide livestock manure processing equipment that composts the entire amount of wet livestock manure without causing secondary pollution due to squeezing water sewage.

The livestock manure processing equipment of the present invention includes a dehydrator that dehydrates and moistens wet livestock manure to a state where it can be easily fermented, a vertical primary fermenter that composts the dehydrated and moistened livestock manure in two stages, and a horizontal two-stage It is equipped with a fermenter that communicates with the next fermenter in an L-shape, and a methane fermenter that digests the squeezing water wastewater separated during dehydration and humidity control with methane fermentation. Place a heat exchanger, place a heat exchanger for heat radiation inside the methane fermentation tank, connect the heat exchanger for heat reception and the heat exchanger for heat radiation so that hot water circulates, and discharge from the secondary fermentation tank. A part of the fully ripened compost is returned to the mixing hopper installed at the starting end of the secondary fermenter, and the digestive juice flowing out from the methane fermenter via the liquid pipe is mixed with this and sent to the secondary fermenter. It is characterized by being made to return to its original state.

Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments. In the figure, 1 is a dehydrator that dehydrates and moisturizes wet livestock manure A to a state where it can be easily fermented, 2 is a fermenter that composts the dehydrated and moistened livestock manure _A1 in two stages, and 3 is a dehydrator. This is a methane fermentation tank that digests the squeezing water wastewater separated by 1 through methane fermentation.

The dehydrator 1 is, for example, a screw type dehydrator, and dehydrates and moisturizes the wet livestock manure A put into the hopper 11, and the dehydrated and moistened livestock manure _A1 pushed out from the extrusion port 12 is transferred to the conveyor 13. It is designed to be put into a fermentation tank 2. On the other hand, the squeezing water wastewater separated during dehydration and humidity control flows out from the porous portion 14, passes through the saucer 15 and the outlet pipe 16, accumulates in the storage tank 17, and is further transferred to the water supply pipe 19 by the electric pump 18 for methane fermentation. It is designed to be introduced into tank 3.

The fermentation tank 2 is formed by connecting a vertical primary fermentation tank 21 and a horizontal secondary fermentation tank 22 in an L-shape so as to compost the humidity-controlled livestock manure _A1 in two stages.
The conveyor 13 faces above the primary fermenter 21. Both the primary fermentation tank 21 and the secondary fermentation tank 22 have a rectangular cross-sectional shape, the volume of the primary fermentation tank 21 is 10 to 15 times the amount of livestock manure processed per day, and the secondary fermentation tank The volume of 22 is 9 to 14 times larger than the daily amount. Reference numeral 23 denotes a heat exchanger for receiving heat, which is vertically arranged in the primary fermentation tank 21 so as not to prevent settling of the humidity-controlled livestock manure.
Of course, the heat exchanger 23 for receiving heat can also be placed inside the secondary fermenter 22. Reference numerals 24 and 25 are an agitation transfer shaft and an air jet pipe, respectively, which are arranged along the longitudinal direction within the secondary fermentation tank 22. 24' is an electric motor with a speed reducer that drives the agitation transfer shaft 24. 2
5' is a blower which supplies an appropriate amount of air into the secondary fermentation tank 22 from an air jet pipe 25 through an air supply pipe 25''.26 is a blower at the starting end of the secondary fermentation tank 22. This is a mixing hopper with an attached electric mixer. A part of the ripe compost is taken out from the bypass port 27 provided at the end of the secondary fermentation tank 22, and this is returned to the mixing hopper 26 by the return conveyor 28 as return ripe compost B. , and is returned to the starting end of the secondary fermentation tank 22.

The methane fermentation tank 3 is hermetically sealed, with a lower part serving as a sewage reservoir and an upper part serving as a gas reservoir. The volume of the sewage basin is equal to the amount of squeezed wastewater generated per day.
It is large enough to accommodate 20-30 times.
The outer surface of the methane fermentation tank 3 is coated with an appropriate heat insulating material to prevent heat dissipation, and sewage water is introduced into the ceiling or side of the tank 3 at an appropriate height to introduce wastewater from the squeeze water. A mouth 31 is provided, and a digestive fluid outlet 32 is provided at the bottom of the tank 3. In the tank 3, a heat exchanger 33 for heat dissipation is arranged horizontally near the bottom of the tank, a mixer 34 with a motor is arranged above it, and a safety valve 35 and a methane gas outlet pipe are installed in the ceiling of the tank 3. 36 is attached. Sewage inlet 31
is connected to the water supply pipe 19, and the digestive fluid flows from the digestive fluid outlet 32, through the liquid supply pipe 32', and from the rising outflow end of the liquid supply pipe 32' to the mixing hopper 26 with the electric mixer. ing. An overflow pipe may be provided upright at the digestive fluid outflow port 32, which is lower than the rising and outflow end of the liquid sending pipe 32'. Regardless of whether or not the overflow channel is installed upright, due to the principle of the communicating pipe, the liquid level in the methane fermentation tank 3 is equal to the height of the outflow end of the liquid sending pipe 32'. always match, so
Digestive fluid in an amount equal to the amount of squeeze water sewage introduced into the methane fermentation tank 3 via the water supply pipe 19 and the wastewater inlet 31 is automatically transferred to the mixing hopper 26 via the digestive fluid outlet 32 and the liquid supply pipe 32'. It's starting to leak out. 3
7 is a circulation pump with an electric motor, and a return pipe 3
3' and the inlet pipe 23'.
Hot water is circulated between the heat exchanger 23 and the heat receiving heat exchanger 23. 38 is a desulfurization tower, and 39 is a methane gas supply pipe for sending methane gas to homes and the like. 40 is wet livestock manure A in the hopper 11 of the dehydrator 1
41 is an input conveyor for inputting fully ripened compost discharged from the compost discharge port 29 of the secondary fermentation tank 22.
This is an unloading conveyor that unloads _A2 .

Next, the effect will be explained. First, wet livestock manure A containing urine and washing water is carried out from the livestock barn using a cat cart, etc., and transferred to the input conveyor 40 into the hopper 1 of the dehydrator 1.
1, it is compressed and dehydrated, dehydrated and moistened to a state that is easy to ferment, that is, with a moisture content of 60 to 65%, turned into dehydrated and moistened livestock manure _A1 , and pushed out from the extrusion port 12, and transferred to a fermentation tank by a conveyor 13. It will be put into 2. Squeezed wastewater separated during dehydration and humidity control is collected in a storage tank 17 and introduced into the methane fermentation tank 3 via a water pipe 19 by a pump 18. The dehydrated and humidified livestock manure A1 put into the fermenter ₂ is the vertical primary fermenter 2
1, and then enters the horizontal secondary fermentation tank 22, where it is stirred by the agitation transfer shaft 24, and approximately 1/7 of the longitudinal length of the secondary fermentation tank 22 per day.
It is sent by a distance equivalent to ~1/10. Humidity controlled livestock manure
In the process of sedimentation in the vertical primary fermentation tank 21, _A1 is fermented and water is evaporated to become dry compost. In the horizontal secondary fermentation tank, the dried compost is humidified together with the returned mature compost B using digestive juices, re-fermented, and fully ripened, as will be described later. At this time, in order to keep the inside of the fermenter 2 aerobic, an appropriate amount of air is supplied by the blower 25' through the air supply pipe 25'' and the air jet pipe 25. Fermentation heat reaches around 70°C 2 to 3 days after livestock manure A ₁ is added. Due to this fermentation heat, the circulating water in the heat receiving heat exchanger 23 placed in the primary fermentation tank 21 reaches around 50°C. The circulation pump 37
The water is sent to the heat exchanger 33 for heat radiation inside the methane fermentation tank 3 via the water pipe 23'. Squeezed water and sewage in the methane fermentation tank 3 are removed by a heat exchanger 33 for heat dissipation.
It is heated to around ℃ and decomposed by anaerobic methane-fermenting bacteria for 20 to 30 days, producing methane gas and being digested to become digestive fluid. When the squeezing water wastewater accumulated in the storage tank 17 is appropriately introduced into the methane fermentation tank 3 by the pump 18, the same amount of digestive fluid as the introduced amount of the squeezing water wastewater is automatically added each time according to the principle of the communicating pipe. The liquid flows out from the outlet 32 into the mixing hopper 26 via the liquid feed pipe 32'. The amount of squeeze water wastewater introduced into the methane fermentation tank 3 per day corresponds to the amount generated per day. On the other hand, a part of the ripened compost is returned from the bypass port 27 of the secondary fermentation tank 22 to ripened compost B.
The mixed hopper 26 is returned to the mixing hopper 26 by the return conveyor 28. In the mixing hopper 26, the return ripe compost B and the digestive fluid are mixed and stirred, and the return ripe compost B is humidified by the digestive fluid and then transferred through the secondary fermentation tank 22 by the stirring transfer shaft 24. It is then gradually mixed into the dry compost after primary fermentation, which is in progress. As a result, the dry compost in the secondary fermentation tank 22 is moderately moistened by the humidified returned ripe compost, and is seeded by the fermentation bacteria contained in large quantities in the returned ripe compost B. It is fermented again under optimal fermentation conditions, and the water evaporates until it is fully ripened.
The compost becomes fully ripened and is discharged from the compost outlet 29. The squeezing water wastewater separated in dehydrator 1 is
Although it contains a BOD of 15,000 to 20,000 PPM and a solid concentration of 6 to 8%, it is reduced to about 3,000 to 4,000 PPM by digestion in the methane fermentation tank 3. At the same time, for example, in the case of cows, per head per day.
Generates ^1.12-1.16m3 of methane gas. The generated methane gas is collected in the gas reservoir above the liquid level in the methane fermentation tank 3, and introduced into the desulfurization tower 38 via the methane gas outlet pipe 36, where the sulfur content is removed and used as household or engine fuel. It will be done. Squeezed wastewater from dehydrator 1 is transferred to methane fermentation tank 3
By digesting the wastewater inside the methane fermentation tank 3, scum is less likely to be generated in the upper part of the wastewater inside the methane fermentation tank 3. This facilitates automatic outflow of digestive juices. By operating the motorized mixer 34 located inside the methane fermentation tank 3, the generation of scum in the upper part of the sewage inside the methane fermentation tank 3 is prevented, and during cold winters, the mixer 34 is operated. The heat generated by the operation of 34 can assist in heating the squeeze water wastewater in the methane fermentation tank 3. Further, when there is no need to use hot water for the methane fermentation tank 3, the hot water can be taken out by a bypass valve attached to the inlet pipe 23' and the return pipe 33' and used for cleaning or the like.

When using the livestock manure processing equipment of the present invention, a dehydrator that dehydrates and adjusts the humidity of wet livestock manure to a state where it is easy to ferment;
By being equipped with a fermenter that composts dehydrated and humidified livestock manure in two stages, and a methane fermentation tank that digests the squeezed water wastewater separated during dehydration and humidification with methane fermentation, Digestion of sewage becomes easier, composting of humidified livestock manure in the fermenter becomes easier, and the composting process can be completed in a short time. In composting dehydrated and moistened livestock manure in two stages, the fermentation tank is formed by connecting a vertical primary fermentation tank and a horizontal secondary fermentation tank in an L-shape, so that the primary fermentation There is no need to provide a feeding means in the tank, which simplifies the structure and reduces the installation floor area of the fermenter. By digesting squeezing water wastewater in the methane fermentation tank, the generation of scum in the methane fermentation tank is reduced, and the digestive fluid flows out smoothly from the methane fermentation tank. Digestion is promoted because the squeezed wastewater in the methane fermentation tank is heated and maintained using fermentation heat. In squeezing the fermentation heat and using it to digest water and sewage, a heat exchanger for heat reception is placed inside the fermenter, a heat exchanger for heat radiation is placed inside the methane fermentation tank, and a heat exchanger for heat reception and a heat exchanger for heat radiation are placed inside the methane fermentation tank. Since the heat exchanger for heat dissipation is connected to allow hot water to circulate, there is no clogging of the heat exchanger for heat reception and heat exchanger for heat dissipation. No equipment is required, the processing equipment is simplified, and maintenance management becomes easier. A portion of the fully ripened compost discharged from the secondary fermenter is returned to the mixing hopper installed at the starting end of the secondary fermenter, and is mixed with the digestive fluid flowing out from the methane fermenter via the liquid pipe. The fermenter is then returned to the secondary fermenter, so
After the primary fermentation, the dry compost is humidified with digestive juices, and the returned ripe compost is used to seed fermentation bacteria. Secondary fermentation is carried out under favorable conditions, and fully ripe compost is obtained. As described above, the entire amount of wet livestock manure can be composted without causing secondary pollution due to waste water from the squeezing water, and methane gas can be obtained.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a schematic diagram showing the overall arrangement of livestock manure processing equipment;
FIG. 2 is an enlarged view of the main part, partially cut away. 1: Dehydrator, 2: Fermenter, 3: Methane fermenter,
21: Vertical primary fermenter, 22: Horizontal secondary fermenter,
23: Heat exchanger for heat reception, 23': Inlet pipe, 26:
Mixing hopper, 32': Liquid sending pipe, 33: Heat exchanger for heat radiation, 33': Return pipe.

Claims (1)

[Scope of Claims] 1. A dehydrator that dehydrates and moisturizes wet livestock manure to a state where it can be easily fermented, and a vertical primary fermenter and horizontal secondary fermenter that compost the dehydrated and moistened livestock manure in two stages. It is equipped with a fermentation tank that communicates with the tank in an L-shape, and a methane fermentation tank that digests the squeezing water wastewater separated during dehydration and humidity control with methane fermentation, and a heat exchanger for heat reception inside the fermentation tank. A heat exchanger for heat radiation is placed inside the methane fermentation tank, and the heat exchanger for heat reception and the heat exchanger for heat radiation are connected so that hot water circulates, and hot water is discharged from the secondary fermentation tank. A portion of the fully ripened compost is returned to the mixing hopper installed at the starting end of the secondary fermenter, and the digestive juice flowing out from the methane fermenter via the liquid pipe is mixed with this and returned to the secondary fermenter. Livestock manure processing equipment characterized by the following features: 2. The livestock manure processing equipment according to claim 1, wherein the dehydrator is a screw-type dehydrator.