JP2018068220A - Litter for animal and method for disposing of litter for animal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide litter for an animal that allows its disposal to be carried out easily.SOLUTION: Litter for an animal is used for breeding an animal and is decomposed by a hydrolysis treatment. After the hydrolysis treatment, the content of an insoluble substance that has not been hydrolyzed is 20 mass% or less. The litter contains pulp that is hydrolyzed by a hydrolysis treatment. The content of the pulp is 80% or more to the bone-dry weight. The hydrolysis treatment is a hydrolysis treatment by an enzyme. Cellulase, for example, can be used for the enzyme, and the hydrolysis can be carried out by adding 5-40 FPU cellulase to 1 g of the bone-dry weight.SELECTED DRAWING: None

Description

  In particular, the present invention relates to an animal litter used for animal breeding and a disposal method for animal litter.

The “laying material” is a livestock material that is laid on the floor of an animal such as a relatively large livestock such as cattle, horses and pigs. The bedding softens the floor to protect the hoofs of livestock, reduces the burden on livestock, and makes you feel comfortable. In addition, the litter absorbs the moisture of the excrement when the livestock is excreted, and prevents dirt from adhering to the body of the livestock. In addition, the bedding is composed of heat-insulating ingredients, keeping the environment in the barn comfortable. Conventional bedding includes wheat straw, sawdust, paper scraps, and the like.
Here, referring to Patent Document 1 as an example of a bedding using conventional paper, the paperboard and / or the bonding paper is crushed into an indefinite shape in the range of 1-50 m / m in length and width, and the crushed pieces have a density of 0. A paper laying technique characterized by being in the range of 0.1 to 0.6 g / cm ³ is disclosed.

On the other hand, in recent years, scintigraphy (nuclear medicine examination) in which radiation emitted from a radioisotope donated into the body is detected and its distribution is imaged is used for diagnosis. Scintigraphy is used for functional diagnosis of tumors (cancers) and various organs in humans.
For example, Patent Document 2 describes a computer program for causing an image diagnosis support apparatus to execute an image by bone scintigraphy.

In recent years, in Japan, as a scintigraphy for livestock, a “bone scintigraphy” technique for inspecting racehorses and racehorses has attracted attention. Equine bone scintigraphy is used to identify fine fractures that cannot be detected by X-ray examinations. In other words, it is possible to identify a minute fracture site by administering a drug containing a radioisotope to a horse and marking osteoblasts that are present on the surface of bone tissue and have a function of creating new bone. .
This kind of equine bone scintigraphy was first reported in 1977, and is currently introduced in 24 countries (more than 100 locations). Equine bone scintigraphy devices are most popular in the order of the United States, the United Kingdom, and Germany, where 500 cases are examined and diagnosed per year. This technology not only has the effect of avoiding economic loss by preventing horse breakage accidents by detecting abnormalities in racehorses and horses at an early stage, but also prevents horsemen and athletes from falling. It also leads to the effect of saving lives.
In large-scale equestrian competitions such as the Olympics, since many race horses visit Japan together with athletes from various countries, scintigraphy of horses staying in Japan is indispensable. In contrast, in Japan, the Enforcement Regulations for the Veterinary Medicine Act was revised in 2008, and the legislation relating to nuclear medicine testing was completed, but it has not yet been realized.

JP 2000-60336 A JP2015-105841A

Here, in Japan, contaminated litter is treated as a solid radioactive contaminant and incinerated or permanently stored in a radiation control area. Even when incinerated, the incineration ash had to be stored permanently in the radiation control area. Also, when the animal suffers from an infectious disease, it is difficult to discard the bedding.
For this reason, when the conventional bedding as described in Patent Document 1 is used for diagnosis of animal scintigraphy or the like, there is a serious problem that disposal is difficult.

  The present invention has been made in view of such a situation, and an object thereof is to solve the above-described problems.

The animal litter of the present invention is an animal litter used for animal breeding and is characterized by being decomposed by hydrolysis treatment.
The animal litter of the present invention is characterized in that after the hydrolysis treatment, the content of insoluble substances that are not hydrolyzed is 20% by mass or less.
The animal litter of the present invention is characterized by containing pulp that is hydrolyzed by the hydrolysis treatment.
The animal bedding according to the present invention is characterized in that the content of the pulp is 80% or more based on the absolute dry weight.
The animal litter of the present invention is characterized in that the hydrolysis treatment is a hydrolysis treatment with an enzyme.
The animal litter of the present invention is characterized in that the enzyme is cellulase.
The animal litter of the present invention is characterized by being hydrolyzed by adding 5 to 40 FPU of the cellulase with respect to 1 g of an absolutely dry weight.
The animal bedding according to the present invention is characterized in that the pulp is kraft pulp subjected to alkaline oxygen delignification treatment.
The animal litter of the present invention is characterized in that the pulp is kraft pulp that has been subjected to alkaline oxygen delignification treatment and bleaching treatment.
The disposal method of the present invention is a disposal method for animal litter used for animal breeding, characterized in that the animal litter is decomposed by hydrolysis treatment.

  According to the present invention, an animal litter that can be easily disposed of can be provided by being configured to be decomposed by hydrolysis treatment.

<Embodiment>
The present inventors can easily dispose of even when radioactive waste is used for scintigraphy or the like, or when animal litter used for examination of sick animals becomes infectious waste. The idea was to develop a water-soluble bedding. This is because if it is water-soluble, the volume of storage space for radioactive waste can be reduced, and if it is 40 Bq / cm ³ or less, it can be discharged (Science and Technology Agency Notification No. 5 in 2000). In addition, if water-soluble, autoclave sterilization and the like can be easily performed. However, strictly speaking, normal paper and pulp are not water-soluble and are only dispersed in an aqueous solution, and do not satisfy the requirements for enabling discharge under various regulations. For this reason, the present inventors have intensively and repeatedly experimented to develop an animal bedding based on pulp that is decomposed by hydrolysis, and completed the present invention.
Specifically, the animal bedding according to the embodiment of the present invention is an animal bedding used for raising animals, and is characterized by being decomposed by hydrolysis treatment. That is, since the water-soluble litter of the present invention can be easily made into a water-soluble state by hydrolysis after use, there is an advantage that disposal becomes easy. Specifically, the animal litter according to the embodiment of the present invention can be water-solubilized by glycation (saccharification) with an enzyme such as cellulase. Moreover, the saccharide produced | generated by the hydrolysis process can also be used as a manufacturing raw material of useful substances, such as ethanol.
Below, the detail of the structure of the animal bedding of this embodiment is demonstrated.

(Raw material for animals)
The animal litter according to the embodiment of the present invention is not particularly limited as long as it is hydrolyzed by hydrolysis treatment. Below, the pulp which can be hydrolyzed with cellulase is demonstrated as a representative example.
First, the detail of the raw material of the pulp hydrolyzed by this embodiment is demonstrated. As a raw material of the pulp of the present embodiment, any biomass derived from woods and herbs can be used without particular limitation.
More specifically, the biomass derived from the wood of this embodiment includes hardwood, conifer xylem, bark, branches, leaves, etc., woodland residual materials, thinned wood, waste wood chips or bark, lumber factory Sawdust, etc., pruned branches and leaves of street trees, construction waste, etc. Moreover, as a biomass raw material derived from herbs, it is also possible to use parts such as stems, leaves, etc. of kenaf, hemp, bagasse, rice and the like without particular limitation.
In the present embodiment, it is preferable to use woody biomass among these biomasses, and it is particularly preferable to use lignocellulosic biomass such as broad-leaved trees and coniferous trees.

The woody material used as biomass in the present embodiment may be a hardwood or a conifer.
Specifically, the hardwood of the present embodiment, for example, Eucalyptus spp (Eucalyptus globulus, Eucalyptus grandis, Eucalyptus urograndis, Eucalyptus pellita, Eucalyptus brassiana, Eucalyptus camaldulensis, etc. Eucalyptus nitens), Acacia genus (Acacia melanoxylon, Acacia mangium, Acacia mearnsiii etc.), Aceа genus (Aceа rubrum, Aceа saccharum etc.), Fagus genus (Fagus sylvаtica etc.), Betula genus (Betula verrucosa, Betula apilifera etc. Although Alnus spp (Alnus incana, etc.) include, but are not limited to.

  Specifically, examples of the conifers of the present embodiment include, for example, Larix genus (Larix leptolepis, Larix sibirica, Larix decidua, etc.), Pinus genus (Pinus radiata, Pinus syltis, etc.), Pseudotsugstisgis, etc. Cryptomeria genus (Cryptomeria japonica etc.), Abies genus (Abies balsameа etc.), Tsuga genus (Tsuga canadensis etc.), Picea genus (Picea abis, Picea glaca, etc. are not limited).

In the present embodiment, these biomasses may be used alone or in combination.
The biomass can be used as a dry solid, a solid containing water, or a slurry.
Here, if the biomass in the present embodiment is a dry solid or a solid containing moisture, it is preferable to supply the biomass after mixing it with water to form a slurry.

  Moreover, in this embodiment, it is also possible to use xylem parts and bark parts of trees, or parts such as stems and branches and leaves of herbaceous plants.

(Craft pulp production method)
Next, the manufacturing method of the pulp of this embodiment is demonstrated.
The pulp of this embodiment is characterized in that unbleached kraft pulp is kraft pulp that has been subjected to alkaline oxygen delignification treatment.
This unbleached kraft pulp can be produced by chemical pulping methods common to those skilled in the art such as kraft cooking method, polysulfide cooking method, soda cooking method, alkali sulfite cooking method and the like. For example, when the kraft cooking method is used, the cooking liquid impregnated into the chips has a sulfidity of 10 to 80%, an effective alkali addition rate of 10 to 40% by mass of the absolutely dry wood mass, a cooking temperature of 120 to 180 ° C. and a residence time. Kraft cooking can be performed under conditions such that the time (cooking time) is 60 to 120 minutes, and unbleached kraft pulp can be obtained. At this time, a cooking aid common to those skilled in the art may be added to the cooking solution used.
In the alkaline oxygen delignification treatment, the above-mentioned unbleached kraft pulp is washed, roughly selected and carefully selected, and then delignified by alkali oxygen bleaching generally used by those skilled in the art. For this alkaline oxygen bleaching, a medium concentration method or a high concentration method common to those skilled in the art can be applied. In the present embodiment, for example, it is preferable to use a medium concentration method in which the pulp concentration is 8 to 15%.

  In the alkaline oxygen delignification treatment of the present embodiment, caustic soda or oxidized kraft white liquor can be used as the alkali in the alkali oxygen bleaching by the medium concentration method. At this time, as the oxygen gas, for example, oxygen from a cryogenic separation method, oxygen from PSA (Pressure Swing Adsorption), oxygen from VSA (Vacuum Swing Adsorption), or the like can be used. Oxygen gas and alkali are, for example, added to a medium-concentration pulp slurry in a medium-concentration mixer, mixed well, and then sent to a reactor that can hold the pulp, oxygen, and alkali mixture under pressure for a certain period of time. And delignified.

In the alkaline oxygen delignification treatment of the present embodiment, the oxygen gas addition rate is 0.5 to 3% by mass per the dry pulp mass, the alkali addition rate is 0.5 to 4% by mass, and the reaction temperature is 80 to 120 ° C. The reaction time is preferably 15 to 100 minutes, and the pulp concentration is preferably 8 to 15% by mass. Other conditions that are common to those skilled in the art can be applied. In the present embodiment, alkaline oxygen bleaching can be continuously performed a plurality of times to advance delignification.
Thus, by delignifying, when a cellulose fiber is hydrolyzed, it becomes less blocked by lignin, and it becomes possible to produce a pulp that is easily hydrolyzed.

Further, the pulp subjected to the alkaline oxygen delignification treatment of the present embodiment is sent to a washing step, and after washing, as described below, can be subjected to chlorine bleaching treatment. That is, in the animal litter according to the embodiment of the present invention, the pulp may be further subjected to a bleaching treatment on the pulp subjected to the alkaline oxygen delignification treatment. This bleaching treatment can be performed using any one or any combination of bleaching agents and bleaching assistants common to those skilled in the art, such as chlorine dioxide, alkali, oxygen, hydrogen peroxide, ozone, peracid, and the like. is there. Further, for example, it is possible to perform a multi-stage bleaching process in which chlorine dioxide bleaching or ozone bleaching is performed in the first stage, and alkali extraction or hydrogen peroxide bleaching process is performed in the second stage. Further, after the third stage, bleaching treatment using chlorine dioxide or hydrogen peroxide may be performed. Further, a chelating agent treatment with ethylenediaminetetraacetic acid (EDTA), diethylenetriaminepentaacetic acid (DTPA) or the like may be performed during the multi-stage bleaching treatment.
By performing the bleaching treatment in this way, it is possible to inactivate or remove the lignin enclosing the cellulose of the pulp almost completely, and it is possible to produce a pulp that is more easily hydrolyzed.

  In addition, the animal litter according to the embodiment of the present invention is manufactured by appropriately drying and molding the above-described pulp or processing the paper into a roll shape as appropriate. At this time, for example, the crusher may be crushed into an indefinite shape having a maximum length of 1 m / m to 100 m / m with flexibility.

(animal)
In the animal litter according to the embodiment of the present invention, the animals to be lapped are various birds and beasts kept by humans such as so-called companion animals. Examples of such animals include dogs, cats, ferrets, rabbits, monkeys, hamsters, mice, rats, and pets, in addition to working or edible livestock such as horses, pigs, cattle, goats, sheep, and birds. It includes animals as various pets such as birds, reptiles, amphibians and insects. The animals of this embodiment include various animals bred in zoos, amusement parks, etc., experimental animals, and the like.
In addition, as the floor on which the animal litter of the present embodiment is laid, the above-mentioned stables, cowsheds, pig houses, various livestock houses such as poultry houses, various pet breeding boxes such as kennels, pet toilets, breeding gauge floors Etc. In addition to this, the animal litter of this embodiment can be laid on the floor of a treatment facility or treatment machine when performing scintigraphy or the like.

(Animal scintigraphy processing)
Here, the scintigraphy process of the animal which concerns on embodiment of this invention is demonstrated. In the animal scintigraphy of this embodiment, for example, a drug containing technetium is used as a radioisotope. For example, when diagnosing a horse, a drug containing technetium is administered, the diagnosis is started 3 hours later, and the diagnosis itself is completed in about 2 hours.
In this diagnosis, sedation is used but anesthesia is not used. For this reason, it becomes a diagnostic method with very few risks. This is because, when anesthesia is used, there is a possibility of worsening the micro-fracture site when staggered.
The technetium that enters the body decreases (decays) in radioactivity over time. Moreover, technetium is given to diuretics and discharged outside. Technetium has a very short half-life of 6 hours, and even at a standard dose such as 5 GBq for a horse weighing 500 kg, it will become 1 Bq or less after 200 hours. That is, the standard for general foods is 100 Bq / kg or less, 10 Bq / kg or less for drinking water, and 1 Bq or less is treated as substantially zero.
As a result, in 48 hours in Japan (24 hours overseas), the horse can be taken out of the radioactive control facility and returned.
In scintigraphy, it is of course possible to use a radioisotope other than technetium.

(Product characteristics of animal litter)
Here, the structure of the specific characteristic of the animal bedding which concerns on embodiment of this invention is demonstrated.
The animal litter of this embodiment is characterized in that the content of insoluble substances that are not hydrolyzed is 20% by mass or less after the hydrolysis treatment. Thus, when it processes by a hydrolysis, processing of a waste becomes easy because content of an insoluble substance will be 20 mass% or less. That is, when the animal litter of this embodiment is used for scintigraphy, the storage space as radioactive waste can be reduced, and further, if it is 40 Bq / cm ³ or less, it can be discharged.
In addition, the animal bedding according to the embodiment of the present invention is characterized in that the pulp content is 80% or more based on the absolute dry weight. The pulp content is preferably 85% or more, more preferably 90% or more, and particularly preferably 95% or more. When the pulp content is 80% or more, unnecessary substances that are not hydrolyzed can be reduced and disposal can be facilitated. In addition, when the pulp content is 80% or more, performances such as cushioning and moisturizing properties as a bedding, and absorbability of excreta can be enhanced.

The animal litter according to the embodiment of the present invention is characterized in that the hydrolysis treatment is a hydrolysis treatment with an enzyme.
Here, the animal litter of this embodiment is characterized in that, for example, this enzyme is a cellulase. Thus, when cellulase is used as an enzyme, it is possible to use various cellulases derived from fungi such as Trichoderma genus, eubacteria, arthropods such as silkworm shrimp and termites, and shellfish. It is also possible to use these various cellulases produced by genetically modified bacteria. In addition to cellulase, enzymes such as hemicellulase can be used.
Moreover, when hydrolyzing the animal litter of this embodiment with a cellulase, it is suitable to hydrolyze by adding cellulase 5-40FPU with respect to 1g of the absolute dry weight of a pulp. The amount of cellulase added, the optimum pH, the amount of metal ions to be added, the reaction temperature, the reaction time, etc. may be adjusted according to the enzyme activity and properties of the cellulase described above, and may be changed as appropriate.

(Animal litter disposal method)
The animal litter disposal method according to the embodiment of the present invention is an animal litter disposal method used for animal breeding, wherein the animal litter is decomposed by hydrolysis. . In this way, by hydrolyzing the bedding, as described above, the residue can be reduced and can be easily disposed of.
Moreover, the animal bedding of this embodiment reduces the storage space by hydrolyzing and saccharifying (glucosylation), and water-solubilizing a pulp with enzymes, such as a cellulase, as mentioned above, and depending on the case, It can also be discharged.
In this case, the hydrolysis treatment time is preferably 0.1 to 150 hours, more preferably 0.5 to 100 hours, and more preferably 0.5 to 72 hours.
Moreover, the range at the time of a hydrolysis process has the preferable range of 3.5-10.0, and the range of 4.0-7.5 is more preferable.
For example, when cellulase derived from the genus Trichoderma is used, saccharification can be almost completely carried out at a pulp concentration of 5% by mass, 50 ° C., and 15 to 24 hours with the above-mentioned addition amount. In addition, when the bacteria contained in the bedding are not sterilized at 50 ° C., the pretreatment can be used after sterilization with alcohol, hypochlorous acid, hydrogen peroxide, or the like.
Moreover, regarding the saccharification by hydrolysis, it is also possible to use a bioethanol production facility and method.
Moreover, after stirring is stopped, the residue can be easily separated by filtering the solution in the tank. This residue can be processed after drying.

[Main effects of this embodiment]
In summary, the following effects can be obtained by configuring as described above. When conventional animal litter as described in Patent Document 1 is used for horse scintigraphy and becomes radioactive waste, it must be stored in a radioactive control area in a massive amount as it is. did not become. In addition, when the animal litter used for the examination of sick animals became infectious waste, sterilization such as autoclave was necessary, and the waste collector could not collect it. For this reason, even if used animal litter is incinerated, it is necessary to install an incinerator in accordance with the enforcement of the Veterinary Medical Law, and although the amount can be reduced, the incineration ash itself must be permanently stored or collected by a disposal company. Investment and operational costs were incurred.
On the other hand, the animal litter according to the embodiment of the present invention is an animal litter used for breeding animals, and is characterized by being decomposed by hydrolysis treatment. Thereby, after using the water-soluble bedding of this embodiment, since it can be easily made into a water-soluble state by a hydrolysis treatment, disposal becomes easy. Moreover, if the requirements of various regulations are satisfied, the waste liquid after the hydrolysis treatment can be discharged.
Moreover, it is also possible to use the saccharide produced by the hydrolysis treatment of the animal litter according to the embodiment of the present invention as a raw material for producing useful substances such as ethanol.

Conventionally, especially in scintigraphic examinations, animals such as horses have been restrained for about 48 hours, so that a burden (stress) has been applied. However, if the scintigraphy or the like of an animal is performed without using a litter, a load is placed on the leg of a horse or the like, so that the floor cushioning is important. Moreover, even if a mat or the like is used, the excrement is difficult to process, and the processing when it becomes obsolete is also difficult.
In contrast, the animal litter according to the embodiment of the present invention has a cushioning property equivalent to or higher than that of conventional wheat straw, sawdust, paper waste, etc. It can protect against the cold from the floor and can reduce the stress of animals. Also, the animal litter of the present embodiment, unlike mats and the like, can effectively capture feces and urine, etc., and keep the animal body and floor dry to maintain cleanliness, and is discarded as described above. Material handling is also simplified. Thereby, the stress of an animal can be reduced and a habitability can be improved and it becomes possible to perform a diagnosis easily.

  In addition, as biomass derived from herbs used as a raw material for the hot water extract of the present embodiment, residues of industrial crops such as kenaf, rice straw, straw, corn cob, bagasse, and industrial crops such as oil crops and rubber crops It is also possible to use biomass such as waste, herbaceous energy crops Eliansus, Miscanthus and Napiergrass. Further, for example, EFB (Empty Fruit Bunch) can be used as the residue and waste of the craft crop.

Moreover, in the above-mentioned embodiment, although the example which uses a pulp as a raw material of animal bedding was described, if it is a compound hydrolyzed, it will not be restricted to this. For example, various biodegradable plastics, rayon, amylose-containing fibers, and the like can be used instead of pulp. Moreover, it is also possible to use as an animal litter by appropriately crushing paper produced as a product instead of pulp itself.
In addition, during the hydrolysis treatment, it is possible to use an inorganic catalyst other than an enzyme, or perform hydrolysis by applying various chemical substances, heat or pressure.

  EXAMPLES Next, although an Example demonstrates this invention further based on drawing, the following specific examples do not limit this invention.

<Production Example 1>
(Manufacture of water-soluble litter 1)
Eucalyptus chips are kraft cooked under the conditions of 5 liquid ratio, 22% active alkali per mass of dry chips, 28% sulfidity of cooking liquor, 160 ° C cooking temperature, 90 minutes residence time (cooking time), unbleached A kraft pulp was obtained.
70.0 g of this unbleached kraft pulp was collected at an absolute dry mass, caustic soda was added at 2.0% per absolute dry pulp mass, and then diluted with ion-exchanged water to prepare a pulp concentration of 10% by mass. A suspension was obtained. Put the pulp suspension into an indirect heating autoclave, inject 99.9% commercial compressed oxygen gas and perform oxygen delignification (alkali oxygen bleaching) at 100 ° C for 60 minutes at a gauge pressure of 0.5 MPa. It was. After the oxygen bleaching was completed, the pressure was reduced until the gauge pressure became 0.05 MPa or less, and the pulp was taken out from the autoclave, washed and dehydrated with 7 liters of ion-exchanged water. This obtained the kraft pulp by which the alkaline oxygen delignification process was carried out.
60 g of this alkaline oxygen delignified kraft pulp was collected in an absolute dry mass, placed in a plastic bag, adjusted to a pulp concentration of 10 mass% using ion-exchanged water, and then 1.0% per mass of the dry pulp. Of chlorine dioxide was added and immersed in a constant temperature water bath at 70 ° C. for 60 minutes to perform chlorine dioxide bleaching. The obtained pulp was diluted to 3% by mass with ion-exchanged water, and then dehydrated and washed with a Buchner funnel. Thereby, the pulp after chlorine dioxide bleaching was obtained.
Put the pulp after bleaching chlorine dioxide into a plastic bag, add ion exchange water to adjust the pulp concentration to 10% by mass, then add 1.0% caustic soda and 0.2% hydrogen peroxide per mass of dry pulp After thoroughly mixing, the mixture was immersed in a constant temperature water bath at a temperature of 70 ° C. for 90 minutes to perform hydrogen peroxide bleaching. The obtained pulp was diluted to 3% by mass with ion-exchanged water, and then dehydrated and washed with a Buchner funnel.

  The hydrogen peroxide-bleached pulp is put in a plastic bag, adjusted to a pulp concentration of 10% by mass with ion-exchanged water, 0.3% of chlorine dioxide is added per mass of completely dry pulp, and the temperature is kept at 70 ° C. It was immersed in a water tank for 60 minutes and subjected to chlorine dioxide bleaching to obtain kraft pulp. This kraft pulp was suspended in 1000 kg of water to prepare a 5% slurry. A pulp sheet (moisture content of 5% by mass) was prepared from this slurry, and the resulting litter was “water-soluble litter 1”.

<Production Example 2>
(Manufacture of water-soluble bedding 2)
Eucalyptus chips are kraft cooked under the conditions of 5 liquid ratio, 22% active alkali per mass of dry chips, 28% sulfidity of cooking liquor, 160 ° C cooking temperature, 90 minutes residence time (cooking time), unbleached A kraft pulp was obtained.
70.0 g of unbleached kraft pulp was collected at an absolute dry mass, caustic soda was added at 2.0% per absolute dry pulp mass, and then diluted with ion-exchanged water to adjust the pulp concentration to 10 mass%. A turbid liquid was obtained. Put the pulp suspension into an indirect heating autoclave, inject 99.9% commercial compressed oxygen gas and perform oxygen delignification (alkali oxygen bleaching) at 100 ° C for 60 minutes at a gauge pressure of 0.5 MPa. It was. After the oxygen bleaching was completed, the pressure was reduced until the gauge pressure became 0.05 MPa or less, the pulp was taken out from the autoclave, washed and dehydrated with 7 liters of ion-exchanged water, and kraft pulp was obtained. This kraft pulp was suspended in 1000 kg of water to prepare a 5% slurry. A pulp sheet (moisture content of 5% by mass) was prepared from this slurry, and the resulting litter was “water-soluble litter 2”.

<Example 1>
The water-soluble litter 1 prepared in Production Example 1 was used as a horse litter for 48 hours. 40 kg of used litter and 800 L of water were supplied to the tank and disaggregated with a stirrer. Cellulase solution (Viscamyl Flow manufactured by Genencor) 3 L (150 FPU / ml) was added to the disaggregated suspension, and the mixture was stirred at 50 ° C. (pH 5.5) for 18 hours. Stirring was stopped after 18 hours, and the solution in the tank was filtered through an 80 mesh screen. The weight of the residue remaining on the screen (absolute dry weight) was measured.

<Example 2>
Using the water-soluble bedding 2 prepared in Production Example 2 as a horse litter, the test was performed in the same manner as in Example 1.

<Comparative Example 1>
In Example 1, all tests were performed in the same manner as in Example 1 except that rice straw was used as a bedding instead of the water-soluble bedding 1.

<Comparative example 2>
In Example 1, it tested by the method similar to Example 1 except having used the straw instead of the water-soluble bedding 1 as a bedding.

<Comparative Example 3>
In Example 1, all tests were performed in the same manner as in Example 1 except that sawdust was used as the bedding instead of the water-soluble bedding 1.

<Comparative Example 4>
In Example 1, all the tests were performed in the same manner as in Example 1 except that newspaper was used as a bedding instead of the water-soluble bedding 1.

<Comparative Example 5>
In Example 1, all tests were performed in the same manner as in Example 1 except that paperboard was used as a bedding instead of the water-soluble bedding 1.

Thus, the rice straw, wheat straw, sawdust, etc. of Comparative Examples 1 to 3 similar to those used in conventional vegetable beddings could not be sufficiently decomposed by hydrolysis. Moreover, even normal papers such as newspapers and paperboards used in conventional bedding as described in Patent Document 1 and the like could not be hydrolyzed so as to be sufficiently water-soluble.
On the other hand, in Example 1, the residue weight after saccharification was 0.01 kg or less, and the content of the residue (residue) with respect to the bedding was 0.025% or less, and it was possible to almost completely dissolve in water. . Also in Example 2, the residue weight was 0.16 kg, and the residue (residue) was 0.4% or less, satisfying the water-soluble conditions that can be discharged as waste.

  In summary, the water-soluble litter 1 of Example 1 and the water-soluble litter 2 of Example 2 had very little residue after saccharification compared to rice straw, straw, sawdust, newspaper, and paperboard. From these results, the water-soluble bedding could be easily made into a water-soluble state by saccharification treatment.

  Note that the configuration and operation of the above-described embodiment are examples, and it is needless to say that the configuration and operation can be appropriately changed and executed without departing from the gist of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used industrially by providing a bedding that reduces waste in animal diagnostic applications and the like.

Claims (10)

Animal litter used for animal breeding,
Animal bedding characterized by being decomposed by hydrolysis treatment. The animal bedding according to claim 1, wherein the content of the insoluble substance that is not hydrolyzed is 20% by mass or less after the hydrolysis treatment. The animal bedding according to claim 1 or 2, comprising pulp hydrolyzed by the hydrolysis treatment. The animal bedding according to claim 3, wherein the content of the pulp is 80% or more based on the absolute dry weight. The animal litter according to any one of claims 1 to 4, wherein the hydrolysis treatment is a hydrolysis treatment with an enzyme. The animal litter according to claim 5, wherein the enzyme is cellulase. The animal litter according to claim 6, wherein the cellulase is hydrolyzed by adding 5 to 40 FPU with respect to 1 g of an absolute dry weight. The animal bedding according to any one of claims 3 to 7, wherein the pulp is kraft pulp subjected to an alkaline oxygen delignification treatment. The animal bedding according to any one of claims 3 to 7, wherein the pulp is kraft pulp that has been subjected to alkaline oxygen delignification treatment and bleaching treatment. A method for disposing of animal litter used for animal breeding,
A method for disposing of animal litter, comprising decomposing the animal litter by hydrolysis.