Animal waste treatment system with water circulation system

Abstract

To provide a water circulation type excreta disposal system for animals which can suppress the volatilization of ammonia contained in excreta that causes strong bad odor, and can be managed by a small number of personnel.SOLUTION: A water circulation type excreta disposal system for animals precipitates and removes a solid matter by dropping excreta of a mouse M to the lower side of a cage 110 and feeding filthy water obtained by mixing treated water flowing on the lower side thereof with the excreta to a precipitation tank 130, achieves deodorizing by feeding the filthy water to an ammonia decomposition tank 140 and performing nitrification processing with a microorganism group attached to a carrier 141, and circulates the treated water by recirculating back the treated water to a water channel 120.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a system for treating feces and urine excreted during animal breeding, and in particular to an animal water circulation type feces and urine treatment system that decomposes ammonia contained in the feces and urine to suppress the generation of unpleasant odors. [Background technology]

[0002] The foul odor caused by animal feces and urine often has a negative impact on the living environment. For example, frozen mice, which are used as food for reptiles kept in zoos and homes, are produced by breeding and raising a large number of parent mice (tens of thousands) in a breeding facility. Mice are usually bred in cages, and the excreted feces and urine are treated by changing the flooring material made of wood chips, water-absorbing polymers, etc. several times a day. Ammonia volatilizes from the flooring material containing feces and urine, generating a strong foul odor, which may spread over a wide area outside the breeding facility and cause a pollution accident. For this reason, breeding facilities for producing frozen mice need to be built on a large site so that the foul odor caused by the feces and urine does not affect people's lives, but it is difficult to secure a site large enough for this purpose in Japan. In addition, the flooring material containing feces and urine must be replaced every day for tens of thousands of mice, and the replaced flooring becomes a large amount of waste, so the production of frozen mice requires a lot of effort and cost.

[0003] For this reason, most of the frozen mice supplied in Japan are currently imported from foreign countries where they can be produced at low cost. On the other hand, the demand for frozen mice in Japan is increasing year by year, and it is expected that it will be difficult to meet the demand with imports alone in the future. Therefore, there is a demand for a feces and urine treatment system that can suppress the generation of odors caused by ammonia in particular, and can be operated with few personnel and at low cost.

[0004] In addition, in chicken farms where chickens are raised for egg production, the manure accumulated in the cages is discharged and collected outside and incinerated, but there is a problem that the manure ferments and generates heat before being processed, causing the temperature inside the chicken farm to rise. For this reason, large ventilating fans are installed in chicken farms to exhaust heat and ventilate the farm on a daily basis. However, when the air inside the chicken farm is ventilated, not only does the exhaust of the foul odor caused by the manure have a negative impact on the surrounding environment, but there is also a concern that the inflow of outside air into the chicken farm increases the risk of chickens contracting infectious diseases. In addition, the cost of manure treatment is one of the factors that increases costs. Therefore, there is a demand for a manure treatment system that can exhaust heat and suppress foul odors without ventilating the chicken farm and can reduce the cost of manure treatment.

[0005] On the other hand, as a conventional system for treating animal feces and urine to suppress the generation of bad odors, for example, animals are fed feed containing a first actinomycete that makes the feces and urine odorless and easy to decompose, and then the excreted feces and urine are decomposed into carbon dioxide and water, as well as NO2 (nitrogen dioxide) and odorless NH4 - Examples of such systems include a manure treatment system that introduces a second actinomycete that decomposes livestock manure into ammonium ions (ammonia ions) (see, for example, Patent Document 1), and an odor reduction system 1 (see, for example, Patent Document 2) that includes a livestock barn 2 having a floor 3 onto which livestock manure can fall and a water storage section 4 made of FRP formed under the floor and storing water for odor reduction to receive the fallen manure, an aeration tank 21 that aerates the manure mixed water discharged from the water storage section 4, a settling tank 31 that settles and separates the aerated sludge that has been aerated in the aeration tank 21, and a return flow path 41 that returns the supernatant water from the settling tank 31 to the water storage section 4.

[0006] The system of Patent Document 1 is a system in which animals are made to take in actinomycetes into their bodies, excreting feces in which ammonia has been decomposed to a certain extent, and the feces is further decomposed by actinomycetes. However, since excretion from animals is continuous, feces and urine are always present in the feces and urine layer 6 and the decomposition tank 9 arranged under the floor of the livestock barn 7, and a certain amount of feces and urine that has not been fully decomposed is included therein, so it is difficult to say that the livestock barn 7 is in a sufficiently hygienic environment. In addition, the system of Patent Document 2 aims to reduce ammonia odor by moving water containing feces and urine that has fallen from the floor into the water storage tank 4 to the aeration tank 21 and aerating it. However, the system configuration is complicated, and many devices that require power supply, such as air sprayers, air compressors, and pumps, are installed in various places, so there is a risk of high running costs. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] JP 2005-160418 A [Patent Document 2] JP 2020-31624 A Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention aims to provide an animal water circulation type manure treatment system that can efficiently suppress odors, eliminate the need for ventilation, and can be operated with a small number of personnel and at low cost in breeding facilities where strong odors are generated due to ammonia volatilizing from manure, such as the above-mentioned frozen mouse breeding facilities and chicken farms, or in breeding facilities where it is not desirable to ventilate the facility. [Means for solving the problem]

[0009] The means adopted by the present invention to solve the above problems is a cage having a floor through which animal feces and urine can pass, and a filter arranged below the cage and extending from the upstream side Always inflow BeThe treated water is Falling from The wastewater containing the feces and urine is Constant outflow from downstream and a downstream side of the waterway, Inflowed a settling tank for settling and removing solids from the wastewater; was then transferred to an ammonia decomposition tank in which a carrier inhabited by a group of microorganisms that nitrify ammonia dissolved in the wastewater is disposed; and the wastewater treated in the ammonia decomposition tank is supplied to the upstream side of the waterway as treated water. Always send out A circulation pump and 、 Equipped with The amount of the treated water discharged from the circulation pump to the waterway is equal to the amount of the wastewater flowing from the waterway to the settling tank. The present invention relates to an animal water circulation type excrement treatment system.

[0010] In the animal water circulation type excrement treatment system (hereinafter, simply referred to as the excrement treatment system for convenience), the excrement of animals is dropped below the cage, and the treatment water flowing through the waterway below the cage becomes wastewater containing the excrement, which flows into a settling tank where solid matter is removed, and then ammonia is nitrified in an ammonia decomposition tank, and the treated water is returned to the waterway as treated water. That is, by circulating water through the excrement treatment system, it is possible to transport the excrement and treat the wastewater. In this way, the wastewater containing the excrement is deodorized by the settling of solid matter and the decomposition of ammonia by microorganisms, and the generation of strong odors can be suppressed. In addition, since the work of replacing the floor material, which was previously performed, is no longer necessary, the labor and cost involved can be reduced. Furthermore, since the excrement of animals is treated immediately after it is excreted, the excrement does not remain in the cage, and the cage can be kept clean.

[0011] The floor portion may be formed in a mesh, lattice or porous shape.

[0012] This allows the floor to function both as a support for the animals housed in the cage and as a passage for excreted urine and feces to fall onto.

[0013] The microbial group may also include one or more nitrite-producing bacteria belonging to the genera Nitrosomonas, Nitrosococcus, Nitrosospira, Nitrosopumilus, and Nitrosospaella, and one or more nitrate-producing bacteria belonging to the genera Nitrobacter and Nitrospira.

[0014] The main cause of the strong odor of manure is the ammonia contained in it. The microorganisms living in the carriers installed in the ammonia decomposition tank have the ability to oxidize ammonia (NH3) and produce nitrite ions (NO2 - ) and nitrite-producing bacteria that produce nitrite ions (NO2 - ) to oxidize to nitrate ions (NO3 - In the ammonia decomposition tank, the nitrite-producing bacteria and the nitrate-producing bacteria act synergistically to nitrify the ammonia dissolved in the wastewater flowing into the ammonia decomposition tank, thereby making it possible to deodorize feces and urine. Effect of the Invention

[0015] According to the animal water circulation type excrement treatment system of the present invention, ammonia, which causes a strong odor in wastewater containing excrement and urine, can be nitrified and deodorized, thereby suppressing the generation of odors inside and outside the breeding facility. In addition, the labor required for cleaning cages is eliminated, which reduces the number of personnel required and the cost. Furthermore, the excrement does not remain inside the cage, so the inside of the cage can be kept clean at all times. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic diagram of an animal water circulation type excrement treatment system according to a first embodiment. [Diagram 2] FIG. 11 is a schematic diagram of an animal water circulation type excrement treatment system according to Example 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] The present invention is an animal water circulation type manure treatment system that is installed in breeding facilities for breeding animals for feed and raising livestock animals, and in particular, is a manure treatment system that is capable of highly efficiently decomposing ammonia, which volatilizes from manure and causes strong odors.

[0018] The manure treatment system includes a cage, a waterway, a settling tank, an ammonia decomposition tank, and a circulation pump.

[0019] A cage is a place where animals are housed and raised, and the size and shape are appropriately set according to the type and size of the animals housed, but the floor part constituting the floor surface of the cage is formed so that it can support the animals while allowing the feces and urine excreted from the animals to pass through and fall below the cage. For example, the floor part can be made of wire netting or mesh material, or made into a lattice shape by combining multiple members, or formed by drilling multiple holes in a plate. In addition, the floor part can be made of materials such as metal or resin that are unlikely to corrode even when in contact with feces and urine, or the surface can be coated with a paint that prevents corrosion. In this way, it is possible to prevent the floor part from corroding and being damaged by the corrosive components contained in the feces and urine. The number and arrangement of the cages are not particularly limited and can be set appropriately. For example, one cage may house one or more animals, or one or more cages may be lined up and used.

[0020] The waterway allows treated water to flow below the cage. In other words, feces and urine that pass through the floor of the cage are received by the waterway and are then entrained in the treated water flowing through it and carried downstream. Therefore, the longitudinal length and width of the waterway are preferably set to be approximately the same as the floor of the cage so that the feces and urine can be reliably received. It is also preferable that the waterway is set to a depth such that the treated water flowing through it does not spill or overflow. It is also preferable that the bottom of the waterway is formed or installed so that it slopes appropriately from the upstream side to the downstream side so that the wastewater containing feces and urine can flow smoothly.

[0021] The settling tank retains treated water (sewage) containing feces and urine for a certain period of time, and solids contained therein, such as feces, are removed by settling. Therefore, the settling tank is connected to the downstream side of the waterway and is configured to receive the wastewater discharged from this waterway. The retention time of the wastewater in the settling tank is set to a retention time sufficient to allow solids to settle. There are no particular limitations on the means by which the wastewater flows in; for example, the settling tank may be installed at a height lower than the downstream side of the waterway to allow natural flow, or the wastewater may be pumped in using a pump.

[0022] The ammonia decomposition tank is a tank where ammonia dissolved in wastewater from which solids have been removed is nitrified by a group of microorganisms. That is, in the ammonia decomposition tank, ammonia, which is the cause of odor, is converted into nitric acid, and feces and urine are deodorized. In the ammonia decomposition tank, a carrier is disposed on which one or more types of microorganisms that nitrify ammonia are attached. The type, size, and shape of the carrier are not particularly limited as long as the microorganisms can grow to an extent that the nitrification of ammonia is sufficiently performed, and the carrier can be appropriately selected according to the characteristics of the microorganisms and the carrier. For example, materials derived from natural sources such as coral fossils, zeolite, and activated carbon, as well as those made from ceramics, glass, acrylic, cellulose, etc. can be used.

[0023] The microorganisms to be allowed to live on the carrier are not particularly limited as long as they have the ability to nitrify ammonia, and one or a combination of two or more types may be used. The nitrification process of ammonia by microorganisms is represented by the following formulas (1) to (3).

[0024] NH 3 +3 / 2O 2 → NO2 - + H2O + H + (1) NO2 - + 1 / 2O2 → NO3 - (2) NH3+ 2O2→ NO3 - + H2O + H + (3)

[0025] The microorganisms performing the nitrification process shown in the above formulas (1) to (3) preferably include, for example, one or more nitrite-producing bacteria belonging to the genera Nitrosomonas, Nitrosococcus, Nitrosospira, Nitrosopumilus, and Nitrosospaella, and one or more nitrite-producing bacteria belonging to the genera Nitrobacter and Nitrospira. These nitrite-producing bacteria and nitrate-producing bacteria are known to exhibit excellent nitrification activity, and by appropriately combining them and allowing them to live on a carrier, it becomes possible to perform deodorization treatment of wastewater with high efficiency.

[0026] Although there is no particular limitation on the means for allowing the wastewater from the settling tank to flow into the ammonia decomposition tank, it is preferable to allow the overflow water from the settling tank to flow in. In this way, the water located at the top of the settling tank from which solids have been thoroughly removed can be allowed to flow in first.

[0027] The circulation pump returns the treated water, which is obtained by deodorizing the wastewater in the ammonia decomposition tank, to the waterway. The circulation pump is disposed between the ammonia decomposition tank and the upstream side of the waterway. The amount of water sent from the pump to the waterway is related to the residence time in the settling tank and the ammonia decomposition tank, and is set so that this is the optimal time.

[0028] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. EXAMPLES

[0029] 1 shows an example of an installation of a feces and urine treatment system 100 according to Example 1 in a breeding facility where parent mice are bred to produce frozen mice to be used as food for animals such as reptiles. The feces and urine treatment system 100 includes a cage 110, a waterway 120, a settling tank 130, an ammonia decomposition tank 140, and a circulation pump 150, and is configured so that treated water, which will be described later, circulates through the waterway 120, the settling tank 130, the ammonia decomposition tank 140, and the circulation pump 150 in that order.

[0030] The cage 110 is composed of a plurality of breeding boxes 110a to 110e arranged in series. Each of the breeding boxes 110a to 110e is made of a box-shaped plastic container with an open top, and houses one or more mice M inside. The floor 111 of each of the breeding boxes 110a to 110e is made of a wire mesh formed by crossing a plurality of stainless steel wires vertically and horizontally, and supports the weight of the mouse M while allowing excreted feces and urine to pass through and fall.

[0031] A waterway 120 is disposed below the cage 110 in the longitudinal direction. The waterway 120 is formed with a generally concave cross section, and treated water, which will be described in detail later, flows through the inside of the concave shape. That is, in the waterway 120, the treated water flows while dragging with it feces and urine that drop from the cage 110, and this becomes wastewater containing feces and urine.

[0032] The longitudinal length and width of the waterway 120 are formed to be approximately the same as or slightly longer than the longitudinal length and width of the cage 110. The waterway 120 is also formed or arranged so that the bottom surface gently slopes from one end 120a on the upstream side to the other end 120b on the downstream side so that the wastewater flows in one direction. As a result, the wastewater flowing through the waterway 120 is sent from the other end 120b toward the settling tank 130.

[0033] The settling tank 130 is disposed below the other end 120b of the waterway 120 so that the wastewater discharged from the waterway 120 naturally flows into it. The wastewater remains in the settling tank 130 for a certain period of time, during which solid matter such as feces is allowed to settle and removed from the treated water. The amount of treated water flowing into the settling tank 130 is adjusted so that the residence time in the settling tank 130 is set to 6 to 72 hours, which is sufficient to allow the solid matter contained in the wastewater to settle. An outlet 131 is provided at the top of the wall surface 130a of the settling tank 130, and the wastewater overflows from this outlet 131 and naturally flows into the ammonia decomposition tank 140.

[0034] The ammonia decomposition tank 140 is provided with an inlet 141 in communication with the outlet 131 of the settling tank 130 at an upper portion of a wall surface 140a so that wastewater overflowing from the settling tank 130 flows into the ammonia decomposition tank 140. The wastewater flowing into the ammonia decomposition tank 140 is wastewater from which solids have been removed and in which ammonia is dissolved at a high concentration.

[0035] A plurality of carriers 143 are laid on the bottom of the ammonia decomposition tank 140. The carriers 143 are porous coral fossils processed into blocks or granules, and microorganisms that nitrify ammonia are attached to the pores. The microorganisms mainly include nitrite-producing bacteria such as Nitrosomonas that oxidize ammonia to produce nitrite ions, and nitrate-producing bacteria such as Nitrobacter that oxidize nitrite ions to produce nitrate ions. When the microorganisms come into contact with the wastewater, the dissolved ammonia is decomposed, and the treated water is deodorized. Furthermore, minute residues that could not be completely removed in the sedimentation tank 130 are adsorbed and filtered by the carriers 143.

[0036] The circulation pump 150 is disposed between an outlet 142 provided at the bottom of a wall surface 140b of the ammonia decomposition tank 140 and one end 120a on the upstream side of the water channel 120, and sends out treated water that has been deodorized in the ammonia decomposition tank 140 toward the one end 120a. In other words, the treated water sent out here becomes the treated water circulating through the water channel 120. Note that the amount of water sent by the circulation pump 150 is equal to the amount of water sent to the settling tank 130 connected to the water channel 120, and therefore the amount of wastewater that flows into the settling tank 130 is determined by the settings of the circulation pump 150.

[0037] Next, a method for treating feces and urine using the feces and urine treatment system 100 will be described.

[0038] The mice M housed in the cage 110 are parent mice that give birth to baby mice that will become the material for the frozen mice, and are fed and raised in the cage 110. The feces and urine excreted from the mice M pass through the floors 111 of the breeding boxes 110a to 110e and fall into the waterway 120. At the same time, the treated water flowing from one end 120a to the other end 120b of the waterway 120 engulfs the fallen feces and urine and becomes wastewater. Next, the wastewater that has flowed through the waterway 120 is sent out from the other end 120b and naturally flows into the settling tank 130.

[0039] The wastewater that flows into the settling tank 130 remains there for a certain period of time, during which solid matter contained in the wastewater, such as feces, is settled and removed. Then, the wastewater from which solid matter has been sufficiently removed overflows from the outlet 131 in conjunction with the inflow of wastewater, and is sent toward the inlet 141 of the ammonia decomposition tank 140.

[0040] The wastewater that flows into the ammonia decomposition tank 140 stays there for a certain period of time and comes into contact with the microorganisms attached to the carrier 143. As a result, the ammonia contained in high concentrations in the wastewater is nitrified, and the wastewater is deodorized.

[0041] After the retention time has elapsed, the treated water obtained by deodorizing the wastewater in the ammonia decomposition tank 140 is pumped up by the circulation pump 150 through the outlet 143 of the ammonia decomposition tank 140 and sent toward one end 120a of the waterway 120. The treated water then flows through the waterway 120 again, and is deodorized by catching the feces and urine that drop from the cages 110. In this way, by circulating the treated water within the feces and urine treatment system 100, it is possible to build a breeding facility that does not produce an ammonia odor. The solid matter that has accumulated in the settling tank 130 is removed as appropriate while monitoring the situation, and the circulating treated water is also replaced as appropriate.

[0042] According to the feces and urine treatment system 100 of this embodiment, the wastewater flowing through the waterway 120 is treated to remove solid matter in the settling tank 130, and then the dissolved ammonia is nitrified to make it odorless. This eliminates the problem of the location of the breeding facility, since no foul odor is emitted inside or outside the breeding facility in which the feces and urine treatment system 100 is installed. In addition, since the work of replacing flooring and cleaning cages, which was previously required, is no longer necessary, the number of workers can be reduced, and frozen mice can be produced at low cost. Furthermore, the feces and urine excreted by the mouse M are immediately discharged into the waterway 120 outside the cage 110, so that the inside of the cage 110 can be kept clean at all times. EXAMPLES

[0043] The feces treatment system 100 of the second embodiment is a modification of the first embodiment, and has a basic configuration in common with the first embodiment. Therefore, in the second embodiment, the configuration that is changed from the first embodiment will be described in detail, and the description of the other configurations will be omitted.

[0044] 2 shows a manure treatment system 100 according to Example 2. The manure treatment system 100 of Example 2 is an example of installation in a poultry farm, and differs from Example 1 in the configurations of a cage 110, a feeding feeder 150, an egg collector 160, a first treatment tank 170, and a second treatment tank 180.

[0045] The cage 110 is constructed in the same way as those installed in general chicken farms, and is formed so that a plurality of chickens C are housed in series in housing sections 110a-110e, which are partitioned at regular intervals. The floor section 111 of the cage 110 is formed of a wire mesh formed by crossing a plurality of stainless steel wires vertically and horizontally, and is designed to support the weight of the chickens C while allowing excreted feces and urine to pass through and fall. In addition, an opening (not shown) large enough for the chickens C to stick their heads out is provided in the front of the cage 110.

[0046] The feeding feeder 150 includes a lane 150a arranged on the front side of the cage 110, and a supplying unit 150b that automatically supplies feed to the lane 150a. The egg collecting machine 160 includes a lane 160a below which eggs E laid by the hens C in the cage 110 are received and transported, and an egg collecting unit 160b that collects the transported eggs E. That is, feeding and egg collection are performed automatically by the feeding feeder 150 and the egg collecting machine 160.

[0047] The first treatment tank 170 is disposed below the other end 120b of the waterway 120 so that the wastewater discharged from the waterway 120 naturally flows into it, and a carrier 172 having a group of microorganisms that nitrify ammonia attached in the pores of porous coral fossils processed into a block or granular shape is placed on a carrier receiving part 171 formed in a tray shape. In other words, the first treatment tank 170 functions as both the settling tank 130 and the ammonia decomposition tank 140 of the first embodiment. The wastewater flowing in from the waterway 120 is retained in the first settling tank 170 for a certain period of time, during which solid matter such as feces is precipitated and removed from the treated water, and at the same time, ammonia is decomposed by the group of microorganisms.

[0048] The second treatment tank 180 includes a carrier receiver 181 and a carrier 182, and functions as both the settling tank 130 and the ammonia decomposition tank 140 of the first embodiment, similar to the first treatment tank 170. The second treatment tank 180 is installed adjacent to the first treatment tank 170 with a partition wall 190 in between, and communicates with the first treatment tank 180 below the carrier receiver 181, through which the wastewater that has been primarily treated in the first settling tank 170 flows in and undergoes secondary treatment of settling and removing solid matter and decomposing ammonia. The carrier 182 is formed with a smaller diameter than the carrier 172 of the first treatment tank 170. The wastewater that has completed the secondary treatment is pumped up from the supernatant portion to the waterway 120 as treated water by a circulation pump 150 disposed above the second treatment tank 180, and circulates through the feces and urine treatment system 100.

[0049] According to the manure treatment system 100 of the second embodiment, the wastewater flowing through the waterway 120 is treated to remove solids in the settling tank 130, and then the dissolved ammonia is nitrified to make it odorless. This prevents the release of bad odors inside and outside the poultry farm, preventing a negative impact on the living environment around the poultry farm. In addition, the manure excreted by the chickens C is immediately discharged into the waterway 120 outside the cage 110 after excretion, so not only can the cage 110 be kept clean at all times, but there is also no need to ventilate to remove the heat generated by the fermentation of the manure, allowing air conditioning in the poultry farm. Furthermore, there is no need to accumulate or dispose of the manure, so the cost of treating the manure can be significantly reduced.

[0050] The present invention is not limited to the above-described embodiments, and various modifications and combinations are possible within the scope of the claims and the scope of the embodiments, and these modifications and combinations are also included in the scope of the rights.

[0051] For example, Example 1 shows an example of installation of a facility for raising parent mice for producing frozen mice, and Example 2 shows an example of installation of a chicken farm, but the installation is not limited to these facilities, and for example, by modifying the configuration of cage 110, it can also be applied to a facility for raising livestock such as pigs.

[0052] Furthermore, instead of constituting the settling tank 130 and the ammonia decomposition tank 140 as a single tank, two or more tanks may be connected together to enable multi-stage treatment, and two or more types of carriers 143 may be provided in the ammonia decomposition tank 140, or a separate filter material may be provided to remove residue. [Explanation of symbols]

[0053] 100 Animal water circulation type manure treatment system 110 Cage 120 Waterway 130 Sedimentation tank 140 Ammonia decomposition tank 141 Carrier (Coral Fossils) 150 Circulation Pump

Claims

1. A cage having a floor through which animal feces and urine can pass; a waterway disposed below the cage for constantly discharging wastewater from a downstream side, the wastewater being a mixture of treated water constantly flowing in from an upstream side and the feces and urine dropping from the floor; A settling tank connected to the downstream side of the waterway for settling and removing solids from the wastewater that flows in; an ammonia decomposition tank connected to the settling tank, the ammonia decomposition tank having a carrier inhabited therein a group of microorganisms that nitrify ammonia dissolved in the wastewater that is introduced after the solid matter has been settled and removed; a circulation pump that constantly sends out the wastewater treated in the ammonia decomposition tank as the treated water toward the upstream side of the waterway, An animal water circulation type excrement treatment system, characterized in that the amount of treated water discharged from the circulation pump to the waterway is equal to the amount of wastewater inflowing from the waterway to the settling tank.

2. 2. The animal water circulation type excrement treatment system according to claim 1, wherein the floor portion is formed in a mesh, lattice or porous shape.

3. The animal water circulation type manure treatment system according to claim 1 or 2, characterized in that the microbial group includes one or more nitrite-producing bacteria belonging to the genera Nitrosomonas, Nitrosococcus, Nitrosospira, Nitrosopumilus, and Nitrosospaella, and one or more nitrate-producing bacteria belonging to the genera Nitrobacter and Nitrospira.

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