JPH1177095A - Livestock excretion treatment system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a novel livestock excretion treatment system preventing the discharge of urine sewage treated water of livestock and mixing sludge removed in a purifying treatment process with livestock excrements and a moisture control material to ferment and dry the resulting mixture and carbonizing the obtained compost to reutilize the same as a soil conditioning material. SOLUTION: A livestock excretion treatment system is equipped with a purifying device 10, an evaporator 20 and a combuster 30 and the treated water of urine sewage purified by the purifying device 10 comes into contact with the exhaust gas discharged from the combuster 30 in the evaporator 20 to receive evaporation action to be conc. and, thereafter, the conc. water is mixed with a compost obtained by fermenting and drying livestock excrements, a moisture control material and sludge and the resulting mixture is carbonized in the combuster 30 while exhaust gas comes into contact with treated water in the evaporator 20 to be discharged to the outside.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a system for treating manure discharged from livestock such as a pig farm.

[0002]

BACKGROUND OF THE INVENTION In pig farms and the like, a method of purifying or fermenting livestock excreta has been conventionally used, and then discharged to a river or reused as compost. However, in recent years, the construction sites for livestock pens have shifted to mountainous areas due to foul odors, etc., and the treated water from the livestock breaches is discharged near the headwaters of the rivers. The quality of the final treated water has deteriorated beyond the purification capacity of the existing purification treatment facility, and there has been a problem that it is impossible to discharge the treated water due to complaints from swine farmers around the residents. In addition to this, the demand for compost obtained by fermenting and drying sludge and the like removed in livestock manure and the purification treatment process has decreased, and there has been a problem that it is difficult to sell compost.

[0003]

[Technical Problems Attempted to Be Developed] The present invention has been made in view of such a background. The present invention has been made to release treated water after treating urinary sewage of livestock and to carbonize compost,
This is an attempt to develop a new livestock manure treatment system that can be reused as a soil conditioner.

[0004]

A livestock manure treatment system according to a first aspect of the present invention comprises a purifying apparatus for purifying livestock wastewater discharged from a barn and an evaporating apparatus for evaporating treated water after the purification processing. And a combustion device for fermenting solids and sludge discharged during the purification process of livestock and carbonizing or incineration of dried compost, and the treated water purified by the purification device is It is subjected to an evaporative action in an evaporator, concentrated, then mixed with the compost, and carbonized or incinerated in a combustion device. According to the present invention, it is possible to eliminate the treated water that has been often discharged into a river after the conventional purification treatment. Therefore, the surrounding environment is not deteriorated.

According to a second aspect of the present invention, in addition to the requirement of the first aspect, the treated water after the purification treatment comes into contact with exhaust gas discharged from a combustion device in an evaporator, and the wastewater is treated with the same. It is characterized by being subjected to evaporation by waste heat. According to the present invention, since the treated water is evaporated by using the waste heat of the exhaust gas discharged from the combustion device, the operation cost and the maintenance cost of the entire system can be reduced.

According to a third aspect of the present invention, in addition to the requirements of the first or second aspect, the exhaust gas discharged from the combustion device is contacted with treated water in an evaporator and then discharged to the outside. It is characterized by being released. According to the present invention, the exhaust gas is washed by coming into contact with the treated water, and can be released in a state where air pollutants contained in the exhaust gas are reduced as much as possible.

A livestock manure processing system according to a fourth aspect is characterized in that, in addition to the requirements according to the first, second or third aspect, a carbide is generated in the combustion device. According to the present invention, livestock manure and sludge are fermented, carbonized without completely burning the dried compost, and can be used and sold as a soil improvement material by generating carbides. Can be reduced.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the illustrated embodiments. In the description, the livestock manure processing apparatus 1 which substantially constitutes the livestock manure processing system of the present invention will be described, and then the livestock manure processing system will be described together with the operation mode of this apparatus. As shown in the flow chart of FIG. 1, the livestock manure treatment device 1 includes a purification device 10 for purifying urine sewage discharged from the barn A, and an evaporator 2 for evaporating treated water after the purification process.
0 and a combustion device 30 for incinerating or carbonizing compost. The outline of each device will be described below.

First, the purifying device 10 will be described. The purifying apparatus 10 is for purifying urine sewage discharged from a livestock house A such as a piggery. As shown in FIG. 1, as an example, a raw water tank 11, a solid-liquid separator 12, a regulating tank 13, an anaerobic tank, 1
4, aerobic tank 15, sedimentation tank 16, and coagulation sedimentation device 17
And a sludge storage tank 18 and a dehydrator 19. The raw water tank 11 temporarily stores the urine sewage discharged from the barn A, and the solid-liquid separator 12 separates the urine sewage sent from the raw water tank 11 into solid and liquid. The solid-liquid separator 12 filters urine sewage by a screen, a filter, or the like to remove solids. The solid matter removed by the solid-liquid separator 12 is a fermentation compost C
Sent to Livestock dung discharged from the livestock house A is also sent to the fermentation compost house C.

The regulating tank 13 is for storing urine sewage from which solids have been removed by the solid-liquid separator 12 and for sending urine sewage to the anaerobic tank 14 at a constant flow rate. The anaerobic tank 14 and the aerobic tank 15 perform so-called biological treatment in which anaerobic microorganisms and aerobic microorganisms respectively decompose organic substances in urine wastewater. Aerobic tank 15
In order to activate the purifying action of aerobic microorganisms, an aeration blower 15a for blowing air to dissolve oxygen is provided, and in the anaerobic tank 14, a stirrer 14a for activating the decomposition action of anaerobic microorganisms is provided. . The sedimentation tank 16 sediments sludge such as microorganisms generated by the biological treatment by sedimentation by gravity sedimentation and removes the sludge.

The coagulating sedimentation device 17 is a device that combines a large number of fine particles remaining in the liquid after the sludge or the like is removed by the sedimentation tank 16 with a coagulant and removes them as a precipitate. Therefore, such treatment is also called chemical treatment. The treated water from which the sludge and the like have been removed by the coagulation and sedimentation device 17 is sent to the relay tank 21 of the evaporator 20. As the coagulant, an aluminum salt, an iron salt or the like is used as an example. The sludge storage tank 18 stores sludge and the like removed by the sedimentation tank 16 and the coagulation sedimentation device 17, and the dehydrator 19 dewaters the sludge and the like sent from the sludge storage tank 18 using a coagulant. It is.

Next, the evaporator 20 will be described. The evaporator 20 is for evaporating and concentrating a part of the treated water after the purification treatment. The evaporator 20 temporarily stores the treated water sent from the purifier 10 and the two treated water tanks 22, 23.
And a packed tower 24 and a spray tower 25. The relay tank 21 is for temporarily storing the treated water supplied from the purification device 10 and then sending the treated water to the treated water tank 22. The packed tower 24 is filled with an appropriate packing material, and the treated water pumped from the treated water tank 22 is supplied from the upper portion, and is simultaneously relayed from the lower portion to the spray tower 25 and discharged from the combustion device 30. Exhaust gas is being supplied.
For this reason, the treated water is subjected to an evaporating action by the exhaust gas while circulating through the treated water tank 22 and the packed tower 24. Further, the filler plays a role of increasing the contact area between the treated water and the exhaust gas in order to promote the evaporation action.

The treated water tank 23 is configured to overflow the treated water subjected to the above-described evaporating action from the treated water tank 22. The spray tower 25 is also sprayed with the treated water pumped from the treated water tank 23 from the upper part, and at the same time, the exhaust gas discharged from the combustion device 30 is supplied from the lower part. Therefore, the treated water is supplied to the treated water tank 23 and the spray tower 2
While circulating through 5, the gas is subjected to an evaporating effect by the exhaust gas, and is discharged as concentrated water from the lower part of spray tower 25 to treated water tank 23. On the other hand, the exhaust gas is washed by coming into contact with the treated water in the spray tower 25 and the packed tower 24, and the air pollutants contained in the exhaust gas are dissolved into the concentrated water and removed. After that, the exhaust gas discharged from the packed tower 24 is collected by a dust collector, and is discharged to the outside by an induction fan.

Next, the combustion device 30 will be described. As the combustion device 30, for example, a device capable of selectively performing carbonization treatment or incineration treatment as required in Japanese Unexamined Patent Publication No. Hei 8-121634, "Method and Apparatus for Carbonization and Incineration of Sludge" is applied. Alternatively, only the carbonization treatment may be performed. A fermentation compost C is provided in front of the combustion device 30. Livestock manure discharged from the barn A, solids removed by the solid-liquid separator 12 of the purification device 10, and sludge removed by the dehydrator 19 are provided. Are fermented in this fermentation compost house C, mixed with a water conditioner, fermented, dried and composted. The combustion apparatus 30 includes, for example, a combustion furnace 31, a combustion blower 32, a combustion burner 33, and a deodorization burner 34. The combustion furnace 31 is a feed hopper 3 for receiving the compost sent from the fermentation composting room C and the treated objects such as the treated water concentrate sent from the treated water tank 23.
5, a stirring member 36 for evenly stirring the object in the combustion furnace 31, an exhaust port 37 for discharging exhaust gas mainly to the spray tower 25, and an outlet port 38 for discharging generated carbides and the like.
It comprises.

The combustion blower 32 sends the combustion air to the object supplied into the combustion furnace 31, and switchesably sends the air to the surface of the object or a layer of the object as required. Although it takes a form, a form in which it is fed only to the surface of the object to be processed may be adopted. This is for the purpose of first creating a state of low oxygen in the layer of the object to be treated when carbonizing the object to be treated, and to completely burn the object to be treated when incinerating the object to be treated. Therefore, in a mode in which only the carbonization process is performed, the combustion air only needs to be sent to the surface of the workpiece.

A deodorizing burner 34 is provided in the vicinity of the exhaust port 37 to deodorize the exhaust gas and to remove pyrolysis gas volatilized from the processing object at the time of carbonization.
Is burned in the upper part of the refuse, and the amount of heat required to carbonize the object is used as radiant heat transfer. The combustion burner 33 is for burning an object to be processed.
The exhaust gas discharged from the combustion furnace 31 is mainly
Sent to 5.

Next, the livestock manure processing system of the present invention will be described together with the operation mode of the livestock manure processing apparatus 1 configured as described above. (1) Purification treatment First, urine sewage discharged from a livestock house A such as a piggery is once stored in a raw water tank 11, and then separated into a solid and a liquid by a solid-liquid separator 12. Thereafter, the removed solid matter having a water content of about 85% is sent to the fermentation compost C, mixed with livestock dung and a water conditioner, and fermented and dried until the water content becomes about 30%. On the other hand, the urine sewage from which solids have been removed by the solid-liquid separator 12 is sent to the adjusting tank 13 where it is sent to the anaerobic tank 14 while controlling the flow rate.

(2) Purification (biological treatment) The urine sewage sent from the regulating tank 13 is first subjected to anaerobic microorganisms (anaerobic bacteria) in an anaerobic tank 14 and then to aerobic microorganisms in an aerobic tank 15. Most of the organic matter inside is removed. The urine sewage is returned from the aerobic tank 15 to the anaerobic tank 14 again, and while circulating, the organic nitrogen and ammonia nitrogen are converted into nitric or nitrite nitrogen in the aerobic tank 15, and It is decomposed into nitrogen gas in the anaerobic tank 14, and nitrogen in urine sewage is removed. By the way, in the aerobic tank 15, about half of the organic matter in the urine sewage is converted by the aerobic microorganisms into cellular substances constituting the cells of the microorganism, and the microorganisms are newly grown, and the other half is decomposed into carbon dioxide and water. As a result, urine sewage is purified. In the anaerobic tank 14, high-molecular organic matter in urine sewage is hydrolyzed to lower molecular weight by anaerobic microorganisms, and is eventually converted into methane gas and carbon dioxide. The ratio is about 90%, and the rest is new. Propagation of various microorganisms (anaerobic bacteria). When the biological treatment described above is sufficiently advanced, microorganisms and the like increase in urine sewage. A very large number of such microorganisms may form large clumps called flocs and precipitate in some cases, and the urine sewage that has been sufficiently subjected to biological treatment is sent to the sedimentation tank 16 and the sediment is removed. Will be removed. Incidentally, this precipitate is generally called sludge. Thereafter, the sludge, which is the sediment, is removed from the sludge storage tank 18.
The liquid after the sludge is removed is transferred to the coagulation and sedimentation device 1
7

(3) Purification Treatment (Chemical Treatment) In the coagulation / sedimentation apparatus 17, a coagulant such as aluminum salt or iron salt is added, and fine particles contained in the liquid sent from the precipitation tank 16 have a negative charge. Summed, aggregated and settled off. In addition, phosphorus contained in the liquid after the biological treatment is also removed by such chemical treatment, and treated water with high clarity is obtained. In this case as well, the sludge as the precipitate is sent to the sludge storage tank 18, and the treated water after the treatment is sent to the relay tank 21 of the evaporator 20. And the sedimentation tank 16 and the coagulation sedimentation device 1
The sludge sent from 7 is once stored in a sludge storage tank 18 and then sent to a dehydrator 19 with a water content of about 98%, where a coagulant is added and dewatered until a water content of about 85%. After that, it is sent to fermentation compost C. On the other hand, the water dehydrated by the dehydrator 19 is returned to the adjusting tank 13 and processed again.

(4) Evaporation treatment The clean treated water supplied to the relay tank 21 of the evaporator 20 is sent to the treated water tank 22 and then overflowed to the treated water tank 23. From the treated water tank 23 to the spray tower 25. Further, exhaust gas discharged from the combustion device 30 is sent from the spray tower 25 to the packed tower 24, and the treated water is supplied to the packed tower 2
4 and the spray tower 25 are subjected to an evaporating effect due to contact with the exhaust gas. The treated water is mainly used in the spray tower 2
5 and is sent to the combustion device 30 in a state of a treated water concentrate of about 20 times as an example. After the exhaust gas is discharged from the packed tower 24, it passes through the dust collector and is discharged to the outside from the induction fan. However, since the exhaust gas is in contact with the treated water in the spray tower 25 and the packed tower 24, the air pollutants are removed. It will be released to the outside in the state where it was.

(5) Combustion treatment The solids and sludge removed by the solid-liquid separator 12 and the dehydrator 19 of the purification device 10 together with livestock manure and a water conditioner have a water content of about 30% in the fermentation manure C. After being fermented into compost and dried, the compost is supplied to the supply hopper 35 of the combustion device 30. At this time, about 97.8% discharged from the treated water tank 23
When the treated water concentrate having a water content of 3 is mixed with compost to be treated and put into the combustion furnace 31, the moisture content of the treated material is set to about 46%. In the combustion furnace 31, the stirring operation by the stirring member 36 is started.
And the supply of combustion air by the combustion blower 32 is started. At this time, the combustion air is supplied to the surface of the object to be processed, and a low oxygen state is created in the layer of the object to be processed. At the same time, the pyrolysis gas volatilized from the object is burned by the deodorizing burner 34 near the exhaust port 37,
Used as radiant heat transfer required for carbonization. Thereafter, the generated carbide is carried out from the outlet 38. When the object to be treated is incinerated in the combustion device 30, the supply of the combustion air by the combustion blower 32 is sufficiently fed into the layer of the object to be treated to completely burn the object to be treated.

[0022]

According to the livestock manure treatment system of the present invention, the treated water purified by the purification device 10 is evaporated and concentrated by the evaporator 20 and then the combustion device 3
At 0, it is mixed with sludge or the like removed during the purification treatment step and carbonized, so that no urine wastewater can be discharged. Also, the surrounding environment is not deteriorated.

According to the livestock manure treatment system of the second aspect, the treated water purified by the purification device 10 is subjected to an evaporative action by coming into contact with the exhaust gas discharged from the combustion device 30. As much as 30 heat can be used as much as possible, and the operating and maintenance costs of the entire system can be reduced.

Further, according to the livestock manure treatment system of the third aspect, the exhaust gas is contacted with the treated water in the spray tower 25 and the packed tower 24 to evaporate the treated water while the exhaust gas is washed. And air pollutants are reduced as much as possible.

Further, according to the livestock manure treatment system of the fourth aspect, livestock manure and sludge are fermented and carbonized without drying the compost completely dried, and the resulting carbonized material is used as a soil improving material. Can be recycled.

[Brief description of the drawings]

FIG. 1 is a flow chart schematically showing a livestock manure treatment system of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Livestock excrement processing apparatus 10 Purification apparatus 11 Raw water tank 12 Solid-liquid separator 13 Adjustment tank 14 Anaerobic tank 14a Stirrer 15 Aerobic tank 15a Aeration blower 16 Sedimentation tank 17 Aggregation sedimentation apparatus 18 Sludge storage tank 19 Dehydrator 20 Evaporation apparatus 21 Relay Tank 22 Treated water tank 23 Treated water tank 24 Filling tower 25 Spray tower 30 Combustion device 31 Combustion furnace 32 Combustion blower 33 Combustion burner 34 Deodorizing burner 35 Supply hopper 36 Stirrer 37 Exhaust port 38 Discharge port A Livestock house C Fermentation compost building

Continued on the front page (51) Int.Cl. ⁶ Identification code FI F23G 7/04 ZAB F23G 7/04 603J 603 B09B 3/00 302G

Claims (4)

[Claims] 1. A purifying apparatus for purifying livestock urine sewage discharged from a livestock barn, an evaporating apparatus for evaporating treated water after the purifying processing, a dung for livestock and solid matter discharged during the purifying processing. Fermentation, sludge, etc., and a combustion device for carbonizing or incinerating the dried compost, and the treated water purified by the purification device is subjected to an evaporating action in the evaporator, concentrated, and then concentrated with the compost. A livestock manure processing system, which is mixed and carbonized or incinerated in a combustion device. 2. The treated water after the purification treatment is brought into contact with exhaust gas discharged from a combustion device in an evaporator, and is subjected to an evaporative action by waste heat thereof.
A livestock manure processing system as described. 3. The livestock manure treatment system according to claim 1, wherein the exhaust gas discharged from the combustion device is discharged to the outside after coming into contact with the treated water in the evaporator. 4. The livestock manure treatment system according to claim 1, wherein the combustion device generates carbide.