How to dispose of discarded chickens

Abstract

To provide a method for disposing of discarded chickens, which can maintain the chickens discarded by slaughter or the like in a safe state even after burying them in the ground by a simple method that prevents or suppresses the infiltration of water into the soil. [Solution] This method for disposing of discarded chickens includes an excavation step of digging a hole in the ground of the land where the discarded chickens are to be buried, a throwing step of throwing the discarded chickens into the hole, a burying step of backfilling the hole with soil and a spraying step of spraying a treatment agent containing a thermoplastic resin onto the surface of the backfilled soil, and the soil is not compacted in the burying step.

Description

[Technical field]

[0001] The present invention relates to a method for disposing of discarded chickens that have been buried in the ground after slaughter or the like. [Background technology]

[0002] For example, in Japan, when highly pathogenic avian influenza (hereafter simply referred to as "avian influenza") occurs, a prefectural governor issues an order to kill chickens, and chickens are killed at poultry farms. The killed chickens are sterilized with lime, then packed into flexible container bags (hereafter referred to as "flexible container bags") and buried in the ground.

[0003] By the way, when chickens are slaughtered, rigor mortis occurs. If such rigor mortis chickens are packed into a FIBC bag, the rigor mortis carcass may break through the FIBC bag, and the chicken's body fluids may leak from the broken part. In response to this problem, the present inventors developed a method for disposing of discarded chickens using a superabsorbent polymer (SAP) (Patent Application No. 2024-34144), which was able to solve the problem before burial (for example, during transportation of the FIBC bag). However, after the FIBC bag is buried in the ground, the weight of the soil puts a large pressure on the FIBC bag, which again increases the possibility of body fluids leaking from the broken part. Since chicken body fluids are infectious organic waste, there is a concern that if the soil is eroded by rainfall or flooding, and the water seeps into the ground and the chicken's body fluids leak out, secondary contamination will spread to the surrounding area.

[0004] Technologies for preventing soil erosion caused by rainfall or flooding are seen in civil engineering works, slope greening works, etc. For example, the soil surface stabilization method of Patent Document 1 involves spraying a chemical on the soil surface, which is a mixture containing an acetylene alcohol derivative and a cationic water-soluble polymer to which a polymer emulsion has been added. According to Patent Document 1, it is said that this method can effectively prevent turbid water from occurring during rainfall.

[0005] In addition, the soil stabilization method of Patent Document 2 involves spreading a solution of chitosan obtained from crab shells diluted with water onto soil as an erosion prevention agent. According to Patent Document 2, adjusting the chitosan concentration to a specific range is expected to have an anti-erosion effect on soil. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Publication No. 11-80727 [Patent Document 2] JP 2010-275697 A Summary of the Invention [Problem to be solved by the invention]

[0007] However, the soil surface stabilization method of Patent Document 1 uses a chemical agent containing a cationic water-soluble polymer, which raises concerns about fish toxicity. In addition, since it is necessary to mix multiple components to prepare the chemical agent, preparation before starting the work is time-consuming.

[0008] The soil stabilization method of Patent Document 2 uses chitosan, a natural biodegradable material, so there is no problem of fish toxicity, but the water inundation prevention effect is not sustainable. In fact, Patent Document 2 states that "the purpose of the method of the present invention is not to stabilize the slope permanently, but to stabilize the slope for a certain period after the slope is formed until plants grow" (paragraph 2 of Patent Document 2)

[0009] See reference), and are not intended to maintain the water ingress prevention effect for a long period of time.

[0009] Furthermore, both Patent Documents 1 and 2 relate to technologies in the field of civil engineering works, and are not intended to be used in the treatment of infectious organic waste.

[0010] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a method for disposing of discarded chickens, which can prevent or suppress the infiltration of water into the soil by a simple method and maintain chickens discarded by slaughter or the like in a safe state even after they are buried in the soil. [Means for solving the problem]

[0011] The characteristic configuration of the method for processing discarded chickens according to the present invention to solve the above problems is as follows: An excavation process for digging a hole in the ground where the discarded chickens will be buried; A step of putting discarded chickens into the hole; A step of backfilling the hole with soil and sand; A spraying step of spraying a treatment agent containing a thermoplastic resin on the surface of the backfilled soil and sand; Inclusive of In the embedding step, the soil is not compacted.

[0012] According to the disposal method for discarded chickens of this configuration, a hole is dug in the ground of the land where the discarded chickens are to be buried (digging process), the discarded chickens are put into the hole (putting process), the hole is then backfilled with soil (burying process), and finally a treatment agent containing a thermoplastic resin is sprayed on the surface of the backfilled soil (spraying process). This simple method forms a thermoplastic resin layer (waterproof layer) on the surface of the soil, which prevents or suppresses the infiltration of water into the soil, thereby reducing the risk of infectious organic waste derived from chicken body fluids, etc., flowing out due to rainfall or flooding, and chickens discarded by slaughter, etc. can be maintained in a safe state even after being buried in the soil. In addition, since the soil is not compacted in the burying process, the discarded chickens in the soil are not crushed by pressure, and in this respect, the disposal method for discarded chickens of this configuration can be said to be highly safe. Furthermore, since the shape of the soil can be sufficiently maintained by the thermoplastic resin layer (waterproof layer) even without compacting the soil, the compaction work can be omitted, so that the disposal method for discarded chickens of this configuration can be said to be efficient in terms of work efficiency.

[0013] In the method for treating discarded chickens according to the present invention, In the burying step, it is preferable that the soil and sand are used to form a bank.

[0014] According to the present method for disposing of discarded chickens, by forming a mound of soil in the burial step, even if the discarded chickens buried in the ground naturally decompose and create cavities in the soil, the mound will sink into the cavities, thereby preventing the ground from sinking (creating holes).

[0015] In the method for treating discarded chickens according to the present invention, In the filling step, it is preferable to use the soil generated in the excavation step as the soil for backfilling the hole.

[0016] According to the method for treating discarded chickens of this configuration, the generated soil can be effectively reused by using the soil generated in the excavation process as the soil to backfill the hole in the burying process. Moreover, since the same soil is used in the excavation process and the burying process, the properties of the land where the discarded chickens are treated do not change, and the treatment can be carried out safely and appropriately.

[0017] In the method for treating discarded chickens according to the present invention, In the spraying step, the content of the thermoplastic resin in the treatment agent is preferably 3 to 10.5% by weight.

[0018] According to the present method for treating discarded chickens, the content of thermoplastic resin contained in the treatment agent in the spraying step is set to 3 to 10.5% by weight, so that a good thermoplastic resin layer (waterproof layer) is formed on the surface of the soil and sand, thereby reliably preventing infectious organic waste derived from chicken body fluids, etc. from being washed away by rainfall, flooding, etc.

[0019] In the method for treating discarded chickens according to the present invention, In the spraying step, the amount of the treatment agent sprayed is 0.5 kg / m 2 More preferably, it is equal to or greater than this.

[0020] According to the method for treating discarded chickens of this configuration, the amount of treatment agent sprayed in the spraying step is 0.5 kg / m 2By doing the above, the treatment agent can penetrate to an appropriate depth from the soil surface, and a good thermoplastic resin layer (waterproof layer) can be formed on the soil surface as a waterproof layer. As a result, it is possible to reliably prevent infectious organic waste derived from chicken body fluids, etc. from flowing out due to rainfall, flooding, etc.

[0021] In the method for treating discarded chickens according to the present invention, In the spraying step, the thermoplastic resin contained in the treatment agent is preferably ethylene-vinyl acetate copolymer (EVA).

[0022] According to the method for treating discarded chickens, a strong thermoplastic resin layer (waterproof layer) can be formed on the surface of the soil by using ethylene vinyl acetate copolymer (EVA) as the thermoplastic resin contained in the treatment agent. In addition, the treatment agent containing ethylene vinyl acetate copolymer (EVA) can be sprayed on the surface of the soil in the form of a solution (emulsion), which means that the workability of the spraying process is excellent.

[0023] In the method for treating discarded chickens according to the present invention, The discarded chickens are preferably chickens that have been culled due to an outbreak of highly pathogenic avian influenza.

[0024] According to the present method for processing discarded chickens, even if chickens that have been culled due to an outbreak of highly pathogenic avian influenza damage the processing container due to rigor mortis and infectious organic waste derived from the chicken's body fluids, etc. leaks out from the processing container, the thermoplastic resin layer (waterproof layer) formed on the surface of the soil can prevent or suppress water from entering the soil, thereby reducing the risk of infectious organic waste leaking out due to rainfall, flooding, etc., and the discarded chickens can be kept safe in the soil. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a schematic diagram for explaining the method for treating discarded chickens of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] The embodiments of the method for treating discarded chickens of the present invention will be described below. However, the present invention is not limited to these embodiments.

[0027] The present inventors have been studying various methods for preventing water from seeping into the ground, and have noticed that soil can be made water-resistant by solidifying it with a thermoplastic resin. They thought that the use of such a thermoplastic resin would prevent or inhibit water from seeping into the ground, and that it would be possible to reduce the risk of infectious organic waste derived from chicken body fluids, etc., leaking out due to rainfall or flooding even after burying discarded chickens in the ground. As will be described in detail in the Examples below, a treatment agent containing ethylene vinyl acetate copolymer (EVA), an example of a thermoplastic resin, was sprayed on simulated soil to solidify the soil on the surface, and a water infiltration test was carried out on the simulated soil, confirming that the agent had a high water infiltration inhibition effect. In this way, the present inventors have discovered that discarded chickens can be safely and appropriately treated even after burying them in the ground by treating the soil with a thermoplastic resin, and have completed the present invention. That is, the method for disposing of discarded chickens of the present invention involves spraying a treating agent containing a thermoplastic resin onto the surface of the soil in which chickens to be disposed of have been buried, and is particularly intended for disposing of chickens that have been culled following an outbreak of avian influenza.

[0028] <Treatment Agent> In the method for treating discarded chickens of the present invention, a thermoplastic resin or a composition containing a thermoplastic resin is used as a treatment agent to solidify the soil. Examples of thermoplastic resins include ethylene-vinyl acetate copolymer (EVA), polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS), and acrylonitrile-butadiene-styrene copolymer (ABS). Among these thermoplastic resins, ethylene-vinyl acetate copolymer (EVA) is preferred. In ethylene-vinyl acetate copolymer (EVA), the ratio of the ethylene component to the vinyl acetate component is not particularly limited, but a flexible film can be formed by increasing the ratio of the ethylene component, and a hard film can be formed by increasing the ratio of the vinyl acetate component. Therefore, the ethylene-vinyl acetate copolymer (EVA) used as the treatment agent may be selected from those having an appropriate ratio of the ethylene component to the vinyl acetate component depending on the properties of the soil to be treated. For example, by setting the ratio of the ethylene component in the ethylene-vinyl acetate copolymer (EVA) to about 3 to 10% (molar conversion), a film with a good balance between flexibility and hardness can be formed, making it possible to handle many types of soil.

[0029] In addition to the thermoplastic resin, the treatment agent may also contain a bactericide, an antibacterial agent, an antiviral agent, a deodorizer, a thickener, a dispersant, and the like.

[0030] The treatment agent is preferably in the form of an emulsion in which a thermoplastic resin is dispersed in a solvent, and particularly preferably in the form of an aqueous emulsion in which a thermoplastic resin is dispersed in water. In this emulsion (treatment agent), the content of the thermoplastic resin (solid content) is preferably 3 to 10.5% by weight. In this range, the soil can be appropriately solidified, and a good thermoplastic resin layer can be formed as a waterproof layer on the soil surface. If the content of the thermoplastic resin contained in the treatment agent is less than 3% by weight, there is a risk that the soil cannot be sufficiently solidified. On the other hand, if the content of the thermoplastic resin contained in the treatment agent is more than 10.5% by weight, there is a risk that cracks will occur on the surface (thermoplastic resin layer) of the solidified soil.

[0031] When using (spraying) an emulsion type treatment agent, the amount used (sprayed) should be 0.5 kg / m2 on the soil surface (ground). 2 It is preferable that the content is 1 kg / m or more. 2 It is more preferable that the amount of the treatment agent used is 0.5 kg / m or more. 2 If the amount of the treatment agent is 0.5 kg / m or more, the treatment agent will reach a suitable depth (for example, 1 to 10 cm) from the soil surface, and a good thermoplastic resin layer (waterproof layer) can be formed on the soil surface as a waterproof layer. 2 If the amount is less than this, the treatment agent will not penetrate into the soil sufficiently and will remain near the soil surface, which may result in the soil not being sufficiently consolidated. On the other hand, there is no particular upper limit on the amount of treatment agent used, but considering the cost of using the treatment agent, a maximum of 5 kg / m is recommended. 2 The extent is realistic.

[0032] <How to dispose of discarded chickens> The method for treating cull chickens of the present invention using the above-mentioned treatment agent will be described. Fig. 1 is a schematic diagram for explaining the method for treating cull chickens of the present invention. The method for treating cull chickens of the present invention includes four steps: an excavation step, a throwing step, a burying step, and a scattering step. Each step will be described in detail below.

[0033] <Drilling process> In the excavation process, a hole 2 is dug in the ground 1 of the land where discarded chickens (chickens culled due to an outbreak of avian influenza) are to be buried (FIGS. 1(a) and (b)). The land where discarded chickens are to be buried is usually set within the premises of a chicken farm. Since discarded chickens are disposed of in FIBCs, the size of the hole 2 only needs to be large enough to hold several to a dozen FIBCs (diameter 1100 mm, height 1100 mm, capacity 1000 L). For the excavation means 3 for excavating the hole 2, a shovel is illustrated in FIG. 2(b) for the sake of convenience, but heavy machinery such as a backhoe is generally used. Soil 4 generated by the excavation of the hole 2 is temporarily placed near the hole 2.

[0034] <Input process> In the throwing process, discarded chickens (more precisely, flexi-con bags containing discarded chickens) 5 are thrown into the hole 2 (FIG. 1(c)). The discarded chickens 5 that are thrown in should preferably fit to a depth of about 2 / 3 of the depth of the hole 2. In addition, it is desirable to throw in the discarded chickens 5 so that they are aligned at the bottom of the hole 2.

[0035] <Burial process> In the burying process, the hole 2 is backfilled with soil 4 (FIG. 1(d)). Here, in the present invention, it is essential not to compact the soil 4. Compaction refers to hardening the ground with tools such as rollers and rammers or heavy machinery. In road construction, the laid soil is usually compacted to increase the strength of the soil surface, but when compaction is performed, the pressure is transmitted to the soil. In the present invention, the backfilled soil 4 is not compacted to prevent the discarded chickens buried in the soil from being crushed by the pressure. The soil 4 generated in the excavation process is used as the soil 4 to backfill the hole 2. This allows the soil 4 to be effectively reused. In addition, since the same soil 4 is handled in the excavation process and the burying process, the properties of the land where the discarded chickens 5 are processed do not change, and safe and appropriate processing can be performed.

[0036] <Spraying process> In the spraying step, a treatment agent 6 containing a thermoplastic resin is sprayed onto the surface of the backfilled soil 4 (FIG. 1(e)). As the thermoplastic resin, ethylene vinyl acetate copolymer (EVA) is preferable. Ethylene vinyl acetate copolymer (EVA) can form a strong thermoplastic resin layer (waterproof layer) on the surface of the soil 4. In addition, since the treatment agent containing ethylene vinyl acetate copolymer (EVA) can be sprayed onto the surface of the soil 4 in the form of a solution (emulsion), it can be said that the workability of the spraying step is excellent. The means for spraying the treatment agent 6 is not particularly limited, and examples thereof include a spraying device 11 consisting of a chemical tank 8, a pump 9, and a shower head 10 as shown in the figure. The content of the thermoplastic resin contained in the treatment agent 6 is preferably 3 to 10.5% by weight. The amount of treatment agent 6 sprayed is 0.5 kg / m 2The above is preferable. These are as explained in the above section on "treatment agent". When the treatment agent 6 dries, a thermoplastic resin layer (waterproof layer) 7 is formed on the surface of the soil 4. Note that when discarded chickens 5 buried in the soil naturally decompose, cavities may form in the soil. However, if an embankment is formed with the soil 4 as shown in FIG. 1(d), the embankment will sink into the cavities as shown in FIG. 1(f), preventing the ground from sinking (creating holes).

[0037] As described above, according to the method for treating discarded chickens of the present invention, a hole 2 is dug in the ground 1 of the land where discarded chickens 5 are to be buried (digging step), discarded chickens 5 are thrown into the hole 2 (throwing step), the hole 2 is then backfilled with soil 4 (burying step), and finally, a treatment agent 6 containing a thermoplastic resin is sprayed on the surface of the backfilled soil 4 (spraying step). This simple method forms a thermoplastic resin on the surface of the soil 4, which prevents or suppresses the infiltration of water into the soil, thereby reducing the risk of infectious organic waste derived from chicken body fluids, etc., flowing out due to rainfall or flooding, and chickens discarded by slaughter, etc. can be maintained in a safe state even after being buried in the soil. In addition, since the soil 4 is not compacted in the burying step, the discarded chickens 5 in the soil are not crushed by pressure, and in this respect, the method for treating discarded chickens of the present invention can be said to be highly safe. Furthermore, the method for disposing of discarded chickens of the present invention can be said to be efficient in that the shape of the soil 4 can be sufficiently maintained by the thermoplastic resin layer (waterproof layer) 7 without the need for compacting the soil 4, thereby eliminating the need for compaction work.

[0038] Furthermore, according to the method for treating discarded chickens of the present invention, even if chickens that have been culled due to an outbreak of avian influenza damage the FIBC (treatment container) due to rigor mortis and infectious organic waste derived from the chicken's body fluids, etc. leaks out of the FIBC, the thermoplastic resin layer (waterproof layer) 7 formed on the surface of the soil 4 can prevent or suppress water from entering the soil, thereby reducing the risk of infectious organic waste leaking out due to rainfall, flooding, etc., and the discarded chickens 5 can be kept safe in the soil. EXAMPLES

[0039] In order to verify the effectiveness of the method for treating discarded chickens of the present invention, a submersion test was carried out on soil treated with a treating agent.

[0040] <Drugs and materials used> The drugs and materials used in the test are as follows: Treatment agent: Ethylene vinyl acetate copolymer (EVA) aqueous emulsion (solid content of original solution: 21% by weight) Comparative agent: Carboxymethylcellulose (CMC) Clay: Clay from Tochigi Prefecture (Tochiclay (registered trademark)) Sand: A 1:1 mix of silica sand No. 3 and silica sand No. 5 (by weight)

[0041] <Reproduction of rainfall> According to the Ministry of Land, Infrastructure, Transport and Tourism website, the average annual rainfall in Japan is 1718 mm. According to the Japan Meteorological Agency website, a situation in which the rainfall per hour is between 50 mm and 80 mm is considered "very heavy rain," and a situation in which the rainfall is 80 mm or more is considered "severe rain." Based on this information, the target area for this flooding test was set to 120 mm x 120 mm (0.0144 m 2 ) and simultaneously reproduced the amount of precipitation (volume) and rainfall intensity (flow rate) by generating six months' worth of precipitation in a short period of time.

[0042] [Precipitation (volume)] The formula is omitted, but the average annual rainfall in Japan is 1718 mm, so it is 0.0144 m. 2 The amount of precipitation (volume) that fell in this area over a six-month period is calculated to be approximately 13 (L).

[0043] [Rain Intensity (Flow)] Using a gardening shower to spray tap water at a flow rate of 1.3 (L / min) for 10 consecutive minutes, the aforementioned six-month rainfall (volume) of 13 (L) was reproduced. The formula is omitted, but this rainfall (volume) is converted to 78 mm per hour, which is equivalent to "very heavy rain" as defined by the Japan Meteorological Agency.

[0044] <Preparation of reproduced soil> Assuming the soil generated when the ground of the land where the discarded chickens are buried is excavated, clay and sand were mixed in weight ratios of (1) 100%:0%, (2) 70%:30%, and (3) 50%:50%, and each mixed soil was watered and stirred until it became a state equivalent to general surplus soil, to obtain reproduced soils A to C. When water is added to the mixed soil and stirred, some of the soil aggregates, which increases the variation in particle size. Furthermore, since the aggregated soil has large gaps, it may not be possible to properly evaluate the soil infiltration test. Therefore, the soil was sieved using a sieve with a mesh size of 2.0 mm, and the soil that passed through the sieve was used for the test as reproduced soil. The composition of reproduced soils A to C is shown in Table 1.

[0045] [Table 1]

[0046] <Water immersion test> Soil and sand submersion tests were carried out using the treatment agents of the following Examples 1 to 8. For comparison, soil and sand submersion tests were similarly carried out using the treatment agent of Comparative Example 1 or under the conditions of Comparative Examples 2 and 3.

[0047] Example 1 An undiluted aqueous emulsion of ethylene-vinyl acetate copolymer (EVA) with a solid content of 21% by weight was diluted two-fold with water to prepare the treatment agent of Example 1 (solid content: 10.5% by weight).

[0048] Example 2 An undiluted aqueous emulsion of ethylene-vinyl acetate copolymer (EVA) with a solid content of 21% by weight was diluted 5 times with water to prepare the treatment agent of Example 2 (solid content: 4.2% by weight).

[0049] Example 3 An undiluted aqueous emulsion of ethylene-vinyl acetate copolymer (EVA) with a solid content of 21% by weight was diluted 6 times with water to prepare the treatment agent of Example 3 (solid content: 3.5% by weight).

[0050] Example 4 An undiluted aqueous emulsion of ethylene-vinyl acetate copolymer (EVA) with a solid content of 21% by weight was diluted 7 times with water to prepare the treatment agent of Example 4 (solid content: 3.0% by weight).

[0051] Example 5 An undiluted aqueous emulsion of ethylene-vinyl acetate copolymer (EVA) with a solid content of 21% by weight was diluted 8 times with water to prepare the treatment agent of Example 5 (solid content: 2.6% by weight).

[0052] Example 6 An undiluted aqueous emulsion of ethylene-vinyl acetate copolymer (EVA) with a solid content of 21% by weight was diluted 9 times with water to prepare the treatment agent of Example 6 (solid content: 2.3% by weight).

[0053] Example 7 An undiluted aqueous emulsion of ethylene-vinyl acetate copolymer (EVA) with a solid content of 21% by weight was diluted 10 times with water to prepare the treatment agent of Example 7 (solid content: 2.1% by weight).

[0054] Example 8 An undiluted aqueous emulsion of ethylene-vinyl acetate copolymer (EVA) with a solid content of 21% by weight was diluted 15 times with water to prepare the treatment agent of Example 8 (solid content: 1.4% by weight).

[0055] Comparative Example 1 An aqueous solution of carboxymethylcellulose (CMC) prepared by dissolving CMC in water was used as the treatment agent of Comparative Example 1 (solid content: 0.5% by weight).

[0056] Comparative Example 2 No treatment chemicals were used.

[0057] Comparative Example 3 No treatment chemicals were used, but the soil was compacted.

[0058] The soil submersion test and evaluation were carried out according to the following steps (1) to (7). (1) A hole with a radius of 3 cm is made in the center of a non-permeable plastic plate (120 mm x 120 mm) and a nonwoven fabric (repurposed from a ventilation fan filter) is attached to cover the hole. (2) Place a polyvinyl chloride pipe (inner diameter: approximately 3 cm, height: approximately 10 cm) on a plate with the nonwoven fabric side facing up, with the nonwoven fabric between them, aligning it with the position of the hole. Place a funnel on top of the polyvinyl chloride pipe and pour in 100 g of simulated soil and sand, allowing the soil to deposit into the polyvinyl chloride pipe by natural fall. (3) In the cases of Examples 1 to 8 and Comparative Examples 1 and 2, the polyvinyl chloride pipe was removed as is. In the case of Comparative Example 3, the hole in the plate was blocked from the opposite side of the polyvinyl chloride pipe, and the polyvinyl chloride pipe was tamped (compacted) 25 times with a 2.5 kg rammer before being removed. (4) The treatment agents of Examples 1 to 8 were sprayed onto the surface of the soil obtained in (3) above at a rate of 1 kg / m 2 A considerable amount is sprayed and allowed to dry naturally for about a day in a temperature- and humidity-controlled room (temperature: 20±5°C, humidity: 50±10%). For Comparative Example 1, since CMC is highly viscous and spraying using a spray bottle is difficult, water is first sprayed onto the surface of the soil and sand, and then the treatment agent is sprayed using a syringe before allowing to dry naturally for about a day. For Comparative Example 2, only natural drying is allowed for about a day. For Comparative Example 3, after compaction (rolling), natural drying is allowed for about a day. (5) After drying, each sample (soil + plate) is placed on top of a beaker with the soil side facing up, and a shower is placed 100 mm above it. (6) Spray tap water from the shower in the off mode (flow rate: 1.3 L / min, time: 10 min). At this time, the water that permeates the soil collects in the beaker, and the water that does not permeate the soil flows out of the beaker. (7) After watering has finished, measure the amount of water W (L) remaining in the beaker and calculate the permeability R (%) using the following formula. Water permeability R(%) = L / 13 × 100 (8) The water ingress prevention effect is evaluated comprehensively based on the permeability R and the condition of the soil. For samples where the soil could not withstand 10 minutes of water spraying and collapsed during the process, the water ingress prevention effect is evaluated based on the time until collapse, since the permeability R cannot be measured. The evaluation criteria are as follows: A + : The soil does not collapse for 10 minutes or more and the permeability is 10% or less. A : The soil does not collapse for more than 10 minutes. ·B It takes 2 to 10 minutes for the soil to collapse. C : It takes less than two minutes for the soil to collapse. D : The soil collapses instantly (in about 1 second).

[0059] <Test Results> The results of the soil submersion tests are shown in Table 2.

[0060] [Table 2]

[0061] <Consideration> As shown in Examples 1 to 4, when the undiluted solution (solid content 21% by weight) of an aqueous emulsion of ethylene vinyl acetate copolymer (EVA) was diluted 2 to 7 times with water (solid content 3.0 to 10.5% by weight) as the treatment agent, the soil did not collapse after 10 minutes of continuous water spraying for any of the reproduced soils A to C. In this way, it was confirmed that the use of the treatment agents of Examples 1 to 4 exhibited an excellent water infiltration suppression effect (evaluation A or higher). In particular, when the treatment agents of Examples 1 to 3 in which the undiluted solution was diluted 2 to 6 times were used on reproduced soil A, when the treatment agents of Examples 1 to 4 in which the undiluted solution was diluted 2 to 7 times were used on reproduced soil B, and when the treatment agents of Examples 1 to 4 in which the undiluted solution was diluted 2 to 7 times were used on reproduced soil C, the permeability was 10% or less, and an extremely excellent water infiltration suppression effect was exhibited (evaluation A or higher). + ).

[0062] As shown in Examples 5 to 8, when an undiluted ethylene-vinyl acetate copolymer (EVA) aqueous emulsion (solid content 21% by weight) was diluted 8 to 15 times with water (solid content 1.4 to 2.6% by weight) and used as a treatment agent, none of the simulated soils A to C could withstand 10 minutes of continuous water spraying. However, since it took more than 2 minutes for them to collapse, a certain degree of water seepage suppression effect was observed (evaluation B).

[0063] From the results of Examples 1 to 8, when a treatment agent containing ethylene vinyl acetate copolymer (EVA) was used, the higher the solids concentration of the ethylene vinyl acetate copolymer (EVA) contained in the treatment agent, the higher the water infiltration suppression effect tended to be. Note that, in the reproduced soil A to C, Example 1 (solids content 10.5% by weight), in which the original solution was diluted two-fold, had a slightly lower water permeability than Example 2 (solids content 4.2% by weight), in which the original solution was diluted five-fold. The reason for this is thought to be that when the solids concentration of the treatment agent reached a certain level or higher, cracks occurred in the waterproof layer (EVA layer) formed on the soil surface after drying, and some water infiltrated through the cracks.

[0064] In contrast, as shown in Comparative Example 1, when a carboxymethylcellulose (CMC) aqueous solution (solid content 0.5% by weight) was used as the treatment agent, the reproduced soils A to C collapsed in about 1 minute, and no waterlogging suppression effect was observed (Evaluation C).

[0065] As shown in Comparative Example 2, in the case where no treatment agent was used, the reproduced soils A to C all collapsed instantly (within about 1 second), and no effect of suppressing flooding was observed at all (evaluation D).

[0066] As shown in Comparative Example 3, no treatment chemicals were used, but the soil was compacted. For all of the reproduced soils A to C, the soil collapsed in about 30 seconds, and no water infiltration suppression effect was observed (Evaluation C).

[0067] As described above, according to the disposal method for discarded chickens (Example) of the present invention, the thermoplastic resin layer (waterproof layer) formed on the surface of the soil can prevent or suppress the infiltration of water into the soil, thereby reducing the risk of infectious organic waste derived from chicken body fluids, etc., flowing out due to rainfall or flooding, and chickens discarded by slaughter, etc. can be maintained in a safe state even after being buried in the soil. In addition, since the soil is not compacted, the discarded chickens in the soil are not crushed by pressure, so in this respect, the disposal method for discarded chickens of the present invention can be said to be highly safe. Furthermore, the disposal method for discarded chickens of the present invention can be said to be efficient in that the shape of the soil can be sufficiently maintained by the thermoplastic resin layer (waterproof layer) without compacting the soil, and therefore compaction work can be omitted. [Industrial Applicability]

[0068] The method for disposing of discarded chickens of the present invention is used to dispose of chickens that have been culled due to an outbreak of avian influenza, but it can also be used to dispose of chickens that have been culled for other reasons. [Explanation of symbols]

[0069] 1 ground 2 holes 3. Excavation Method 4. Soil 5. Discarded chickens 6 Treatment Agents 7 Thermoplastic resin layer (waterproof layer) 8 Chemical tank 9. Pump 10. Shower Head 11 Spraying equipment

Claims

1. An excavation process for digging a hole in the ground where the discarded chickens will be buried; A step of putting discarded chickens into the hole; A step of backfilling the hole with soil and sand; A spraying step of spraying a treatment agent containing a thermoplastic resin on the surface of the backfilled soil and sand; a forming step of forming a waterproof layer of the thermoplastic resin on the surface of the soil; Inclusive of The method for disposing of discarded chickens, wherein the soil is not compacted in the burying step.

2. 2. The method for treating discarded chickens according to claim 1, wherein the soil is used to form a mound in the burying step.

3. 2. The method for treating discarded chickens according to claim 1, wherein in the burying step, the soil generated in the excavation step is used as the soil for backfilling the hole.

4. 2. The method for treating discarded chickens according to claim 1, wherein the content of the thermoplastic resin contained in the treating agent in the spraying step is 3 to 10.5% by weight.

5. In the spraying step, the amount of the treatment agent sprayed is 0.5 kg / m ２ The method for treating discarded chickens according to claim 4.

6. The method for treating discarded chickens according to any one of claims 1 to 5, wherein in the spraying step, the thermoplastic resin contained in the treating agent is ethylene-vinyl acetate copolymer (EVA).

7. 7. The method for treating discarded chickens according to claim 6, wherein the discarded chickens are chickens that have been culled due to an outbreak of highly pathogenic avian influenza.

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