JP2006110537A - Method and agent for treating livestock excrement - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and to obtain an agent for safely treating livestock excrement slurry having a particularly high water content in a way of easy biodegradation and effective solidification, through which the resultant product is easy for handling and can be stacked up high to spare the space for store and transportation. <P>SOLUTION: The agent for treating livestock excrement comprises a vinyl alcohol copolymer having a degree of saponification of 90% by mole or above and a particle diameter of 2 to 20 mesh, and the method for treating livestock excrement comprises an aerobic fermentation process after adding the above agent to the livestock excrement and solidifying it. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a processing agent for livestock excrement and a method for processing livestock excretion, and more specifically, slurry-like livestock excrement can be solidified safely, with good biodegradability, and effectively. The present invention relates to a treatment for livestock excrement and a method for treating livestock excrement, which are easy to handle, can be stacked up, and can save space for storage and transportation.

  In recent years, contamination of rivers and groundwater due to inappropriate treatment of livestock excreta has become a problem. Conventionally, composting using sawdust, rice husk, rice straw and the like has been performed for the treatment of these livestock excreta. However, in addition to the difficulty of obtaining these materials year by year, it is necessary to secure a wide storage place because they are bulky. In addition, since the laws and regulations on livestock excrement treatment become stricter, further increase in livestock excrement to be composted is expected. In this way, there is a concern that the increase in livestock excrement to be composted and the availability of materials for composting will become more difficult. It is rare.

  In composting (composting) such as livestock manure, a water conditioner is indispensable in order to promote fermentation by microorganisms. In other words, composting is the production of compost, which is an organic fertilizer, by decomposing and changing organic matter in manure of animals such as humans, cattle, horses, pigs, and chickens. It is a temperate microorganism. The water content is optimally 60 to 70% by mass. If the water content is higher than this range, the air permeability is poor and the fermentation is inhibited, and even if the water content is low, the fermentation becomes worse.

  Currently, sawdust, rice straw, bark, and the like are used as moisture regulators for this purpose, but their water absorption is about 1 to 5 times the mass, resulting in a low water absorption rate. The amount of compost increases due to the large amount of use of the moisture adjusting agent, making it difficult to process in the region. As a result, there are problems such as an increase in equipment size and an increase in processing costs.

  In addition, since a large amount of sawdust, rice straw, etc. is used, composting takes time, and it is difficult to fully mature compost. High-moisture compost materials are very difficult to handle, and when transported by a belt conveyor or transported by a dump truck, the high-moisture compost materials spread in a slurry state, causing the surrounding pollution due to runoff, scattering, or transport efficiency. It has the problem of being lowered.

  Furthermore, in the processing of slurry-like livestock excrement, operations such as sawdust, rice husk, rice straw and the like are solidified to facilitate handling. However, since these materials have a low water absorption rate, the processing requires a large amount of material that is bulky and equal to or greater than the amount of livestock excrement, and securing storage space and increasing the amount of excrement due to processing are problematic. Yes.

  For this reason, for the treatment of livestock excreta, a polymer water-absorbing agent, for example, a cross-linked polyacrylic acid (for example, see Patent Document 1), starch or a cross-linked cellulose derivative (for example, see Patent Document 2), a cross-linked polyamino acid (for example, , Patent Document 3) and other polymer crosslinked bodies such as organic materials (for example, see Patent Documents 4 to 7) have been proposed.

  However, the cross-linked polyacrylic acid of Patent Document 1 is not biodegradable, and considering that the compost produced after the treatment is carried to the field, there is a concern of accumulation in the environment, which is inappropriate. In addition, the starch or cellulose-based polymer water-absorbing agent of Patent Document 2 has biodegradability, but has a high degradation rate, decomposition occurs during storage and transportation, and there is a possibility that the absorbed water may be discharged. The drainage measures are necessary. Although the polyamino acid polymer water-absorbing agent of Patent Document 3 is also biodegradable, it is fermentation production by microorganisms and is difficult to mass-produce. In Patent Documents 4 to 7, it cannot be said that the above-mentioned problems can be sufficiently solved as a composting aid.

  In Patent Document 8, as animal manure fertilizer, modified polyvinyl alcohol having a particle size of 20 to 100 mesh obtained by heat-treating at 130 ° C. after alkaline saponification of 98% of the vinyl acetate component in Example 1 has a water content of 70. % Of chicken manure. However, such modified polyvinyl alcohol tends to harden when mixed especially for cow or pig feces having a water content of 80% or more, and is not uniformly mixed. In addition, excrement having a high water content has a lot of stickiness after mixing and lacks solidification performance. In addition, the treated excrement becomes difficult to handle, such as adhesion to devices and instruments. Moreover, since these excrement cannot be piled up highly, a wide storage space is required and the high utilization of the storage space is calculated | required. Furthermore, when transporting by truck, etc., it cannot be transported efficiently, requiring a lot of labor, and the waste disposal facility becomes larger, and the processing facility is required to be downsized.

JP-A-60-65784 JP 57-81893 A JP 2001-261475 A JP 58-208189 A JP 62-202889 A JP-A-6-205624 JP-A-8-208362 JP-A-56-114889

  In the present invention, the slurry-like livestock excrement having a particularly high water content can be safely and biodegradable and effectively solidified, and the treated product has a good handleability and a high level. It is an object of the present invention to provide a treatment for livestock excrement and a method for treating livestock excrement, which can be stacked and can save space for storage and transportation.

  As a result of earnest research on the treatment agent for livestock excrement having the above-mentioned problems, the present inventor has used the polyvinyl alcohol copolymer having a high saponification degree and a relatively large particle size as the treatment agent. The present inventors have found that a treatment agent satisfying such performance can be obtained, easy to handle, has little storage space, and can safely and effectively treat livestock excrement.

That is, this invention provides the processing agent for livestock excrement, and the processing method of livestock excrement below.
(1) A livestock excrement treating agent comprising a polyvinyl alcohol copolymer having a saponification degree of 90 mol% or more and a particle size of 2 to 20 mesh.
(2) When a mixture of a livestock excrement treatment agent 20 g, sawdust 250 g and cow dung 1.0 kg was put into a container having an upper inner diameter of 12 cm, a lower inner diameter of 10 cm and a depth of 10 cm, and dropped from its place of 10 cm height by its own weight The processing agent for livestock excrement of (1) whose stacked height is 5 cm or more.
(3) 12 kg / head / day of sawdust and 1 kg / head / day of livestock excrement are sprayed on the barn cleaner in the dairy cattle barn. The processing agent for livestock excrement according to (1) or (2), wherein the pile height when piled up to (1.6 mx 2.0 m) is 2.0 m or higher from the floor of the loading platform.
(4) The treatment agent for livestock excretion according to any one of (1) to (3), which is applied to livestock excretion having a water content of 80% or more.
(5) The treatment agent for livestock excretion according to any one of (1) to (4), wherein the livestock excrement is cattle and / or swine excrement.
(6) A method for solidifying livestock excreta, which comprises applying the livestock excrement treating agent according to any one of (1) to (5) to livestock excrement.
(7) The method for solidifying livestock excrement according to (6), wherein the livestock excrement treatment agent is applied at a ratio of 0.1 to 30% by mass with respect to livestock excrement.
(8) A method for treating livestock excrement, comprising applying the treatment agent for livestock excrement according to any one of (1) to (5) to the livestock excrement and solidifying it, followed by aerobic fermentation.
(9) A method for treating livestock excreta, wherein the livestock excrement treating agent according to any one of (1) to (5) is used as a fermentation aid in the composting process of livestock excreta.

The treatment agent for livestock excrement of the present invention can safely and effectively solidify slurry livestock excrement with a small amount of use compared to conventional sawdust, rice husk, rice straw and the like. it can.
Further, the treatment agent for livestock excrement of the present invention has high stability, can be stored for a long time, has biodegradability, and does not accumulate in the environment. Can be processed without causing contamination.
In addition, solidified livestock excrement does not cause drainage during storage and transport, is easy to handle, can be stacked up high, requires less space for storage and transport, Because it can be transported efficiently, it leads to downsizing of the treatment facility.
In addition to this, the treatment agent for livestock excrement of the present invention can be subjected to aerobic fermentation after being applied to livestock excrement, thereby composting the livestock excrement and having excellent transportability, handleability, etc. It can be used effectively as agricultural fertilizer.
Furthermore, since the treatment agent for livestock excrement of the present invention absorbs moisture in livestock excrement, it can also be used as a fermentation aid.

  First, the polyvinyl alcohol copolymer used in the treatment agent for livestock excrement of the present invention is obtained by, for example, polymerizing a copolymer monomer and a vinyl compound such as vinyl acetate in the presence of an initiator to form a copolymer monomer and a vinyl compound. This copolymer is produced by saponification, and may be used as a crosslinked product by a crosslinking reaction. Copolymerized monomers include acrylic acid, methacrylic acid, crotonic acid, maleic acid, fumaric acid, itaconic acid, their esters and anhydrides, acrylamide, methacrylamide, N, N-dimethylacrylamide, vinyl sulfonic acid, allyl sulfonic acid , Vinyl versatate, vinyl stearate, vinyl laurate, methyl vinyl ether and the like. These may use only 1 type and may combine 2 or more types.

The treatment agent for livestock excrement of the present invention comprises a polyvinyl alcohol copolymer having a saponification degree of 90 mol% or more and a particle size of 2 to 20 mesh.
In order to improve the handleability, the added polyvinyl alcohol copolymer needs to have a particle size of a certain size or more, and by mixing it with 20 mesh or less, it is mixed with a slurry-like excrement having a particularly high water content. At this time, the polyvinyl alcohol copolymer does not set in one place but is uniformly dispersed.

  In addition, the presence of gel-like resin larger than a certain size in the livestock excrement plays the role of aggregate, can realize stronger solidification, and is less sticky and easy to handle. It is known that the properties of polyvinyl alcohol copolymers vary greatly depending on the degree of saponification. In general, when the degree of saponification is small, the polyvinyl alcohol copolymer is easily soluble in water. Conversely, as the degree of saponification increases, the crystal region increases and the solubility in water decreases. In order to maximize the solidification ability and make the livestock excrement easy to handle, the polyvinyl alcohol copolymer does not dissolve in the excrement and exists in a gel state. It needs to play a role as a material. For this purpose, the treatment agent for livestock excrement of the present invention uses a polyvinyl alcohol copolymer having a saponification degree of 90% or more, preferably 95% or more.

  FIG. 1 is an explanatory view showing the state of gel in livestock excrement. The crystalline region of the polyvinyl alcohol copolymer becomes a cross-linked portion, and the amorphous region becomes a water-absorbing portion. However, in the treatment agent for livestock excrement of the present invention, the polyvinyl alcohol copolymer having a particle size of 2-20 mesh and a saponification degree of 90% or more is used. As a polymer, by having an appropriate crystal region inside, it absorbs water in excreta and becomes a gel having an appropriate size and strength.

Examples of composting materials to be solidified include livestock excreta such as cattle, pigs, horses and chickens. In particular, the treatment agent for livestock excreta of the present invention has a water content of 80% by mass or more. It can be suitably used for the excrement of stool.
Therefore, the use place of the processing agent for livestock excrement of the present invention includes the inside of a livestock barn, a composting house, a composting center (collective large-scale composting apparatus), and the like.

  As a method for applying the treatment agent for livestock excrement of the present invention, it may be added and mixed after collecting livestock excrement, or collected simultaneously when collecting livestock excrement by spraying on the floor of the livestock barn You may do it. The application amount can be arbitrarily selected depending on the situation of livestock excretion, but is usually 0.1 to 30% by mass, preferably 1 to 10% by mass. By setting it as 0.1 mass% or more, the effect of a processing agent is acquired and handleability etc. improve. Moreover, the processing agent of this invention can also be added in the composting process process of livestock excrement, and can also be used as a fermentation aid.

The treatment agent for livestock excrement of the present invention is used in a compounded state with bark, sawdust, burrs, wood chips, pruned trees, rice straw, volcanic ash, coal ash, silica, bentonite, zeolite, talc, diatomaceous earth, calcium carbonate, etc. Alternatively, these may be added separately and used together for solidification. In addition, a general polymer water-absorbing agent such as a cross-linked polyacrylic acid, a biodegradable polymer water-absorbing agent such as a carboxymethyl cellulose cross-linked product, a carboxymethyl starch cross-linked product, and a polyaspartic acid cross-linked product may be used as long as the performance is not impaired. You may mix with the processing agent of this invention.
Moreover, the treatment agent for livestock excrement of the present invention may be one in which silica or the like is coated on the surface, or one to which a deodorant, a fermentation accelerator or the like is added.

The treatment agent for livestock excrement according to the present invention has moderate adhesiveness compared to sawdust, and can be solidified without breaking up the excrement when used in combination with sawdust. Have Moreover, since the amount of sawdust used is reduced, the storage area of sawdust is reduced, the volume of excrement after composting is small, and the processing facility can be downsized.
Furthermore, the treatment agent for livestock excrement of the present invention is biodegradable as compared with general polymer water-absorbing agents such as a cross-linked polyacrylic acid, and is safe and does not accumulate in the environment. Moreover, compared with other biodegradable polymer water-absorbing agents, the stability during storage is high before use and no drainage occurs during fermentation.

It is known that the properties of polyvinyl alcohol vary greatly depending on the degree of saponification. In general, when the degree of saponification is small, polyvinyl alcohol is easily dissolved in water. Conversely, as the degree of saponification increases, the crystal region increases and the solubility in water decreases. In order to obtain a treatment agent for the purpose of stacking, polyvinyl alcohol does not dissolve in excrement and must exist in a gel state and play a role as an adhesive substance.
In the present invention, a polyvinyl alcohol copolymer having a saponification degree of 90 mol% or more has an appropriate crystal region inside, thereby absorbing water in excreta and forming a gel having appropriate adhesiveness and strength. .

  For this reason, as shown in the following Examples 4 to 6 (cup test), the treatment agent for livestock excrement of the present invention is, for example, a container having an upper inner diameter of 12 cm, a lower inner diameter of 10 cm, and a depth of 10 cm as shown in FIG. When a mixture of 20 g of livestock excrement treatment agent, 250 g of sawdust and 1.0 kg of cow dung is put into (cup) and dropped by its own weight from a place with a height of 10 cm, the stacked height can be made 5 cm or more. By using the processing agent for livestock excrement of the present invention, livestock excrement having excellent stacking performance can be obtained, and the space can be saved by highly utilizing the space.

  Further, as shown in Examples 7 to 9 (field test) later, for example, sawdust 12 kg / head / day and livestock excrement treatment agent 1 kg / head / day of the present invention are sprayed on a barn cleaner in a dairy cowshed. Then, using a belt conveyor while solidifying the collected manure with a wheel loader, the stacking height when piled on a truck bed (1.6 mx 2.0 m) is set to 2.0 m or higher from the floor of the bed Therefore, by using the processing agent for livestock excrement of the present invention, livestock excrement can be efficiently transported, and further, the processing facility can be downsized.

In the present invention, after applying the livestock excrement treating agent to the livestock excrement, the solidified product can be aerobically fermented by aeration of air using a normal fermenter or the like. As a result, livestock excreta can be composted and used effectively as agricultural fertilizer as a fertilizer with excellent transportability and handling.
In composting livestock excreta, water adjustment is indispensable to promote fermentation by microorganisms. In other words, composting is the production of compost, which is an organic fertilizer, by decomposing and changing with the microorganisms in livestock excreta, and the microorganisms working at this time are mainly aerobic microorganisms. Therefore, if the moisture content is high, the air permeability is poor and fermentation is inhibited.

The treatment agent of the present invention functions as a treatment agent for livestock excrement, and at the same time, absorbs moisture in livestock excrement and thus functions as a fermentation aid when composting.
Conventionally, sawdust, rice husk, rice straw and the like have been used as composting aids for improving air permeability in composting of livestock excreta. However, since these materials have a low water absorption rate, the processing requires bulky materials that are more than twice as bulky, and there are problems with securing storage locations, increasing excrement associated with processing, and increasing the size of processing equipment. It has become. By using the treatment agent of the present invention in the process of composting, it is possible to reduce the storage area such as sawdust in the composting process, to reduce the amount of excreta to be processed, and to reduce the size of the processing facility.

EXAMPLES Next, although an Example and a comparative example demonstrate this invention further more concretely, this invention is not limited by these Examples.
In the following Examples 1 to 3, Comparative Examples 1 to 4, and Reference Example 1, dairy cattle manure (water content 84 mass%) collected at Yamaguchi Prefectural Agricultural College was used as livestock excrement.
In Examples 4 to 10 and Comparative Examples 5 to 10, dairy cow dung having a moisture content of 87% by mass was collected as a livestock excrement from a neighboring farmhouse and used in the experiment on that day. For sawdust, sawdust having a specific gravity of 0.2 was used.
The classification of the polyvinyl alcohol copolymer used for each sample (referred to as a treating agent; hereinafter the same) was performed using a sieve according to the purpose.

(Measurement method of solidification performance)
(1) Preparation of simulated feces and urine Dock food (500 μm or less, Unicharm “Aiken Genki” for 7 years old and over) and artificial urine (in 1000 g, pure water: 970.9 g, urea: 19.4 g) , NaCl: 8.0 g, MgSO ₄ .7H ₂ O: 1.1 g, CaCl ₂ : 0.6 g) were mixed at a dock hood: artificial urine = 20: 80 (mass ratio) to obtain simulated manure.

(2) Mixing of simulated manure and sample To a 200 ml disposable cup, 100 g of the above simulated manure and 6 g of polyvinyl alcohol copolymer were added and mixed uniformly with a spatula. The sample absorbed water in the simulated manure and allowed to stand until it reached a steady state, and the relative height was measured after 5 hours.

(3) Relative Height Measurement Method Simulated manure mixed with a sample was put into the polyethylene cup shown in FIG. 3, and was pressed with a spatula from above and rubbed into a full cup. The cup was turned upside down and the internal simulated manure was gently removed. After 30 seconds, the height (A) of the simulated feces and urine that came out was measured, and the “relative height” indicating the solidification performance was calculated.
In addition, in the sample D used in Example 1 to be described later, FIG. 4 shows a comparison of “relative height” in the case of dairy cow manure used as livestock excrement and simulated manure.
FIG. 4 shows that both tendencies are similar and that simulated feces can be used as an alternative to cow dung.

(Fermentation test method)
Polyvinyl alcohol copolymer 300 g (250 ml) or sawdust 2.5 kg (12.5 L) was added to 5.0 kg of cow dung and mixed uniformly. Then, the mixture was packed in a fermenter of a small composting experiment apparatus “Kaguyahime” (Fujihira Kogyo Co., Ltd.), and the apparatus was assembled. Air was passed through this at 500 ml / min, an oxygen meter was attached to the exhaust line, and the oxygen concentration was measured. In addition, the thermocouple for temperature measurement was set so as to come to the center of the packed cow dung. The experimental apparatus was installed in a constant temperature room at 25 ° C.

(Evaluation method of stacking performance A (cup test))
A stainless steel vat was charged with 20 g of a sample (treatment agent), 250 g of sawdust and 1.0 kg of cow dung and mixed uniformly. After the treatment agent absorbed water and became a steady state, it was pressed into the polyethylene cup shown in FIG. The height (A) of the livestock excretion formed when the cup was inverted and dropped with its own weight from a place with a height of 10 cm was measured after 1 minute.

(Evaluation method for stacking performance B (field test))
Sprinkle 12kg / head / day (amount used in a normal dairy barn) and sample (treatment agent) 1kg / head / day on a barn cleaner in a dairy barn. Was used to measure the stacking height (height from the floor of the loading platform) when piled on the loading platform (1.6mx2.0m) of the truck, and the stacking performance B (field test) was evaluated as follows.
×: Less than 2.0 m (stacked height)
○: 2.0-2.5m
◎: 2.5m or more

Comparative Example 1 (solidification performance measurement and fermentation test, sample: none)
Solidification performance measurement and fermentation test were performed without mixing the treatment agent with simulated manure and dairy cow dung, respectively. Table 1 shows the results of the solidification performance measurement and the changes over time in the internal temperature and the oxygen concentration of the discharged air from the fermentation test. The “relative height” of the solidification performance measurement is 0.45, and the height is less than half. The excrement before fermentation was in a slurry state and the air permeability was poor (volume = 5.0 L, specific volume = 1.0 ml / g). Moreover, in the fermentation test, the temperature rise accompanying fermentation and the decrease in oxygen concentration were not recognized.

Comparative Example 2 (Sample A)
Using a polyvinyl alcohol copolymer (sample A: PVA-424H, manufactured by Kuraray Co., Ltd.) having a saponification degree of 79.5 mol% and a particle size of 2 to 20 mesh as a sample, the solidification performance was measured and the fermentation test was performed. The results of solidification performance measurement and fermentation test are shown in Table 1.
The “relative height” of the solidification performance measurement was 0.28, and on the contrary, the fluidity increased with addition. The excreta before fermentation was slurry-like and had a high viscosity and poor air permeability (volume = 5.3 L, specific volume = 1.0 ml / g). Moreover, in the fermentation test, the temperature rise accompanying fermentation and the decrease in oxygen concentration were not recognized.

Comparative Example 3 (Sample B)
Measurement of solidification performance and fermentation test using a polyvinyl alcohol copolymer (sample B: manufactured by Nippon Acetate / Poval Co., Ltd., JP-33) having a saponification degree of 88.0 mol% and a particle size of 2 to 20 mesh as a sample. Went. The results of solidification performance measurement and fermentation test are shown in Table 1.
In the measurement of the solidification performance after 5 hours, the solidification state was not yet sufficient, and the excrement before fermentation had a bowl-like shape and a large viscosity, and the air permeability was poor (volume = 6.4 L, specific volume = 1.2 ml). / G). In the fermentation test, although a slight increase in temperature and a decrease in oxygen concentration were observed, it was not sufficient.

Comparative Example 4 (Sample C)
Using a polyvinyl alcohol copolymer having a saponification degree of 97.0 mol% and a particle size of 20 to 100 mesh as a sample (Sample C: JM-23, manufactured by Nippon Acetate / Poval Co., Ltd.), a solidification performance measurement test was conducted. went. The results of solidification performance measurement are shown in Table 1. In the measurement of the solidification performance after 5 hours, the solidification state was still not sufficient.

Reference example (sawdust)
A fermentation test was performed using 2.5 kg (12.5 L) of sawdust having a specific gravity of 0.2 as a sample. The results of the fermentation test are shown in Table 1. Excrement before fermentation was crisp and air permeability was good (volume = 16.5 L, specific volume = 2.2 ml / g). In the fermentation test, an increase in temperature associated with fermentation and a decrease in oxygen concentration were observed. In addition, the volume of sawdust required for solidification was 12.5 L, which was about 50 times that of the polyvinyl alcohol copolymer.

Example 1 (Sample D)
Using a polyvinyl alcohol copolymer (sample D: manufactured by Kuraray Co., Ltd., PVA-624) having a saponification degree of 95.5 mol% and a particle size of 2 to 20 mesh as a sample, the solidification performance was measured and a fermentation test was performed. The results of solidification performance measurement and fermentation test are shown in Table 1. It can be seen that the “relative height” of the solidification performance is 0.9 or more, and it is hardened with almost no change in shape. Excrements before fermentation were crisp and air permeability was good (volume = 10.6 L, specific volume = 2.0 ml / g). In addition, in the fermentation test, an increase in temperature accompanying the fermentation and a decrease in oxygen concentration were observed.

Example 2 (Sample E)
The solidification performance was measured using a polyvinyl alcohol copolymer (sample E: JM-23 manufactured by Nihon Acetate & Poval Co., Ltd.) having a saponification degree of 97.0 mol% and a particle size of 2 to 20 mesh as a sample. . The results of solidification performance measurement are shown in Table 1. It can be seen that the “relative height” of the solidification performance is 0.9 or more, and it is hardened with almost no change in shape.

Example 3 (Sample F)
Using a polyvinyl alcohol copolymer (sample F: manufactured by Nippon Synthetic Chemical Co., Ltd., T-330H) having a saponification degree of 99.5 mol% and a particle size of 2 to 20 mesh as a sample, solidification performance measurement and fermentation test were performed. It was. The results of solidification performance measurement and fermentation test are shown in Table 1. Since the “relative height” of the solidification performance is 1.0, it can be seen that there is no change in shape and it is solidified. Excrements before fermentation were crisp and air permeability was good (volume = 11.1 L, specific volume = 2.1 ml / g). In addition, in the fermentation test, an increase in temperature accompanying the fermentation and a decrease in oxygen concentration were observed.

Example 4 (cup test, sample F)
The stacking performance A was evaluated (cup test) using Sample F (manufactured by Nippon Synthetic Chemical Co., Ltd., T-330H) as a treating agent. The results are shown in Table 2. After dropping, the manure was slightly crushed and deformed. The height after dropping was 7.0 cm.

Example 5 (Sample E)
Stacking performance A was evaluated using Sample E (manufactured by Nippon Vinegar Poval Co., Ltd., JM-23) as a treating agent. The results are shown in Table 2. After dropping, the manure was slightly crushed and deformed. The height after dropping was 8.3 cm.

Example 6 (Sample D)
The stacking performance A was evaluated using Sample D (manufactured by Kuraray Co., Ltd., PVA-624) as a treating agent. The results are shown in Table 2. After dropping, the manure was slightly crushed and deformed. The height after dropping was 7.5 cm.

Comparative Example 5 (no sample)
Stacking performance A was evaluated by adding 250 g of sawdust alone. The results are shown in Table 2. After falling, the manure was crushed and deformed. The height after dropping was 4.2 cm.

Comparative Example 6 (no sample, double amount of sawdust)
Stacking performance A was evaluated by adding 500 g (double amount) of sawdust alone. The results are shown in Table 2. After the fall, the manure fell apart and fell apart. The highest part of the broken piece was 4.2 cm.

Comparative Example 7 (Sample A)
The stacking performance A was evaluated using a polyvinyl alcohol copolymer (sample A: manufactured by Kuraray Co., Ltd., PVA-424H) having a saponification degree of 79.5 mol% and a particle size of 2-20 mesh as a treating agent. The results are shown in Table 2. After falling, the manure was crushed and deformed. The height after dropping was 3.3 cm.

Example 7 (Field Test, Sample F)
The stacking performance test B was evaluated (field test) using Sample F (manufactured by Nippon Synthetic Chemical Co., Ltd., T-330H). The results are shown in Table 3. It was able to load up to 2.5m in height from the floor of the truck bed.

Example 8 (Sample E)
Stacking performance B was evaluated using Sample E (JM-23, manufactured by Nippon Vinegar Poval Co., Ltd.). The results are shown in Table 3. It was possible to pile up to a height of 3.0m.

Example 9 (Sample D)
The stacking performance B was evaluated using Sample D (manufactured by Kuraray Co., Ltd., PVA-624). The results are shown in Table 3. It was able to pile up to height 2.7m.

Comparative Example 8 (no sample)
The stacking performance B was evaluated without using the sample F. The results are shown in Table 3. It could only be stacked up to a height of 1.5m.

Comparative Example 9 (no sample, double amount of sawdust)
The stacking performance B was evaluated without using the sample F and changing the amount of sawdust used to 24 kg / head / day (twice the amount). The results are shown in Table 3. It could only be stacked up to a height of 1.8m.

Comparative Example 10 (Sample A)
The stacking performance B was evaluated using Sample A (manufactured by Kuraray Co., Ltd., PVA-424H). The results are shown in Table 3. It could only be loaded up to a height of 0.9m.

It is explanatory drawing which shows the condition of the gel in livestock excrement. It is explanatory drawing which shows the evaluation method of the stacking performance A (cup test). It is explanatory drawing which shows the measuring method of the relative height in solidification performance measurement. It is a graph which shows the comparison of "relative height" in the case of dairy cow manure used as livestock excrement, and simulated manure.

Claims (9)

  A livestock excrement treating agent comprising a polyvinyl alcohol copolymer having a saponification degree of 90 mol% or more and a particle size of 2 to 20 mesh.   The stacking height when a mixture of 20 g of livestock excrement treatment agent, 250 g of sawdust and 1.0 kg of cow dung is put into a container having an upper inner diameter of 12 cm, a lower inner diameter of 10 cm and a depth of 10 cm, and dropped from its place of 10 cm in height by its own weight. The treatment agent for livestock excrement according to claim 1, wherein is 5 cm or more.   Sprinkle sawdust 12kg / head / day, livestock excrement treatment 1kg / head / day was sprayed on the barn cleaner in the dairy barn. The processing agent for livestock excrement according to claim 1 or 2, wherein the pile height when piled up to 6mx2.0m is 2.0m or more from the floor of the loading platform.   The processing agent for livestock excretion according to any one of claims 1 to 3, which is applied to livestock excretion having a water content of 80% by mass or more.   The livestock excrement treatment agent according to any one of claims 1 to 4, wherein the livestock excrement is cattle and / or swine excrement.   A method for solidifying livestock excreta, comprising applying the treatment for livestock excrement according to any one of claims 1 to 5 to livestock excreta.   The solidification method of the livestock excrement of Claim 6 which applies the processing agent for livestock excrement in the ratio of 0.1-30 mass% with respect to livestock excrement.   A method for treating livestock excrement, comprising applying the treatment agent for livestock excrement according to any one of claims 1 to 5 to solidify the livestock excrement, followed by aerobic fermentation.   A method for treating livestock excreta, comprising using the livestock excrement treating agent according to any one of claims 1 to 5 as a fermentation aid in a composting process of livestock excreta.

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