JP2004121264A - System for processing dirty liquid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system for processing dirty liquid, surly suppressing nasty smell of the dirty liquid such as urine excretion of a pet. <P>SOLUTION: The system for processing dirty liquid has a draining lattice board 1 and a seat-like dirty liquid-treating/absorbing body 2 set under the draining lattice board 1. The undersurface of the draining lattice board 1 is intimately adhered with the upper surface of the dirty liquid-treating/absorbing body 2. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a wastewater treatment system for urinating pets such as cats and dogs, and more particularly to a sludge and a wastewater treatment method.

As a conventional technology relating to a urination processing system for pets such as cats and dogs, a pet manure processing floor described in Patent Literature 1 below is known. In this manure processing floor, the inside of the tray is vertically divided by a porous member such as a wire mesh or perforated metal, sand having a water-repellent function is laid above it, and a water-retaining absorbent resin is provided below. A urine absorbing member is laid so that urine that has passed through the sand is retained in the urine absorbing member.

By the way, in the above-mentioned manure processing bed, since no consideration is given to the urination remaining in the porous member, there is a problem that when the urination stays on the upper surface of the porous member, a bad smell is emitted. Further, when a reinforcing rib or the like is formed on the porous member, a gap is formed between the porous member and the urine absorbing member, and the waste liquid tends to stay as a liquid film on the entire surface of the hole. Had the problem of stinking as well.

JP-A-7-67489

Accordingly, an object of the present invention is to provide a wastewater treatment system, a slug, and a wastewater treatment method that can suppress stagnation of wastewater and reliably prevent malodor.

The present invention relates to a sewage treatment system including a soot and a plate-like sewage treatment absorber laid below the soot, wherein a lower surface of the soot and an upper surface of the sewage treatment absorber are closely contacted. The above object has been achieved by providing a wastewater treatment system as described above.

Further, the present invention is a dirt for treating wastewater, which has a number of liquid passage holes, a vertical section of a boundary portion thereof is formed in a predetermined shape, and lower surfaces of the boundary portions are substantially flush with each other. The above object has been attained by providing a mushroom formed in the above-mentioned manner.

Further, in the present invention, a plate-shaped or sheet-shaped sewage treatment absorber is laid below the above-mentioned soot of the present invention, and the sewage that has passed through the saw is absorbed by the sewage treatment absorber. The above object has been achieved by providing a wastewater treatment method.

According to the present invention, it is possible to eliminate the liquid remaining on the slats such as urinating the pet and to surely suppress the odor caused by the waste liquid.

Hereinafter, the present invention will be described based on preferred embodiments with reference to the drawings.

FIG. 1 shows an embodiment of the wastewater treatment system of the present invention using the duck of the present invention. In the figure, reference symbol S indicates a wastewater treatment system.
The sewage treatment system S of the present embodiment includes a saw blade 1 and a plate-like sewage treatment absorber 2 laid below the saw blade 1. The lower surface of the saw blade 1 and the upper surface of the wastewater treatment absorber 2 are in close contact. As shown in the figure, it is preferable that the wastewater treatment system S is constructed by laying a sink 1 and a waste liquid absorber 2 in a tray 3 and laying sand 4 on the sink 1.

As shown in FIG. 2, the sinkboard 1 has a large number of liquid passage holes 1a, the longitudinal section of the boundary portion 10 is formed in a predetermined shape, and the lower surfaces of the boundary portions 10 (11) are substantially flush. Is formed.
As shown in the figure, the saw 1 has a rectangular outer shape in plan view. The lower surface of the blade 1 is not provided with a reinforcing rib or the like, and the lower end surface of the boundary portion 10 is substantially flush with the upper surface of the wastewater treatment absorber 2 so that the lower surface of the blade 1 can be in close contact with the upper surface of the wastewater treatment absorber 2. Is formed.

In the frame of the present invention, the boundary forming the skeleton is such that, as shown in FIG. 3, the waste liquid can be guided to the absorber without remaining on the upper surface of the bag (the upper surface of the boundary). When the vertical cross-sectional shape is a square or a trapezoid, the width a of the upper surface of the boundary is preferably 2 mm or less, more preferably 1 mm or less. When the vertical cross-sectional shape of the boundary is circular, the radius R is preferably 2 mm or less, more preferably 1 mm or less.

In the present invention, the cross section (horizontal cross section) form and arrangement of the liquid passage hole are not particularly limited as long as the cross section forms and arranges such that the boundary is within the above range. From the viewpoint of the shape and the like, for example, it is preferable that the cross-sectional form of the hole is a regular polygon such as a regular triangle, a square, a regular pentagon, a regular hexagon or a circle, or a combination of these regular polygons or circles. It is particularly preferable that the liquid holes are arranged in the closest density (for example, in the case of a regular hexagon, a honeycomb shape).

According to the present invention, as in the case of the boundary 11 shown in FIG. 2, the strength can be increased by increasing the height of some of the boundaries and increasing the width as necessary. . Also in this case, the lower surface of the boundary portion is formed flush.

As shown in FIG. 2, the scrubber of the present invention may be provided with the peripheral wall portion 12 so that it is not scattered when sand is laid thereon, and the sand can be cleaned with the sawdust. preferable. The height of the peripheral wall is preferably 50 to 300 mm, more preferably 100 to 200 mm.

Although the outer shape of the die of the present invention is not particularly limited, examples thereof include a rectangular shape, a circular shape, and an elliptical shape. The area of the gridiron is not particularly limited, is preferably 400～3600Cm ^2, more preferably 900~2500cm ^2.

This forming material of the present invention is not particularly limited as long as it has corrosion resistance to the waste liquid to be treated, but it is lightweight and easy to handle, from the viewpoint of good moldability, for example, polypropylene, polyethylene, polyethylene terephthalate, The one molded integrally with a general-purpose synthetic resin such as vinyl chloride or ABS is preferable.

The scoop of the present invention can be integrally formed by injection-molding the above synthetic resin. However, in the injection molding, a metal designed so that the injection mark of the injection pin of the molten resin remains on the lower surface side. It is preferable to mold with a mold. By doing so, it is possible to prevent the waste liquid from accumulating in the concave portion of the injection mark of the injection pin, and it is possible to more reliably prevent the generation of offensive odor.

(4) In order to improve the surface wettability and enhance the liquid permeation performance, the scrub of the present invention is preferably subjected to a water-repellent treatment or an antibacterial treatment. The water repellent processing and the antibacterial processing can be performed using a usual technique.

In the so constructed socks, the sewage that has passed through the bed sand laid thereabove reaches the inside of the through-hole, immediately passes through the through-hole, and stays on the upper surface of the soot or passes through. Since a liquid film is not formed and stays in the liquid hole, generation of offensive odor can be surely prevented.

The sewage treatment absorber used in the sewage treatment system of the present invention is formed in a plate or sheet shape and has a predetermined thickness. In the sewage treatment system of the present invention, it is particularly preferable that the lower surface of the soot and the upper surface of the sewage treatment absorber are entirely in close contact with each other, but the contact area is preferably at least 80%, more preferably 90% or more. Is more preferable. If the contact area is less than 80%, odor due to urine retention is likely to occur. Further, the sewage treatment absorber used in the sewage treatment system of the present invention is particularly preferably a flat plate having a flat upper surface, but using a saw blade having a convex portion such as a reinforcing rib on the lower surface. In this case, a structure having a concave portion corresponding to the convex portion can be used, and thereby, both can be brought into close contact.
As described below, the wastewater treatment absorbent is formed by mixing a surfactant or the like with a wastewater absorbent base mainly composed of vegetable fiber or pulp and molding the mixture into a plate shape (also referred to as a first absorbent). A viscous mineral formed into a plate (also referred to as a second absorber); a mixture of pulp and a water-absorbing polymer wrapped in a sheet of nonwoven fabric or the like to form a sheet (also referred to as a third absorber) It is.
The first absorber forms a mixture obtained by mixing a surfactant having an antibacterial property or a surfactant and an antibacterial agent with at least one of a binder, a crosslinking agent and water on a waste liquid absorbing base material. It is made.

The waste liquid absorbing substrate is mainly made of vegetable fiber or pulp. A sewage treatment absorber comprising such a sewage absorbing base material mainly composed of vegetable fiber or pulp is porous and has a low density, so that it is excellent in absorbing sewage such as urine and has a deodorizing effect. Have. Further, since it is a combustible material, it can be easily incinerated and disposed of as combustible waste after use.
As used herein, the term "vegetable fiber" refers to a fiber constituting a plant or an aggregate thereof, which contains components such as lignin, hemicellulose, resin, and ash in addition to cellulose. The term "pulp" refers to a high-purity cellulose obtained by removing components other than cellulose from "vegetable fiber" as much as possible, and so-called chemical pulp corresponds to this.

As the vegetable fiber, ground pulp, sawdust, jute, coconut fiber and the like can be used alone or in combination of two or more. In particular, it is preferable to use ground pulp and / or sawdust from the viewpoints of improving the absorbability of urine and the like and the deodorizing effect, and providing a stable supply. Grand pulp (GP) is also called groundwood pulp and is a so-called mechanical pulp. In addition to GP, mechanical pulp includes stone ground wood pulp (SGP), refiner ground wood pulp (RGP), thermomechanical pulp (TMP), and the like. In this specification, these are collectively referred to as ground pulp. Among ground pulp, it is particularly preferable to use ground stonewood pulp from the viewpoint of the deodorizing effect.
As the pulp, it is preferable to use waste paper pulp, but it is particularly preferable to use deinking pulp from the viewpoint of water absorption.
The vegetable fiber and the pulp may be used alone as a waste liquid absorbing base material, or both may be used as a waste liquid absorbing base material. When both are mixed, the mixing ratio (weight) of the vegetable fiber and the pulp can be appropriately selected in the range of vegetable fiber: pulp = 10: 1 to 1: 100.

The first absorbent preferably contains the vegetable fiber, the pulp or a mixture thereof in an amount of 50 to 95% by weight, particularly 70 to 90% by weight. It is preferred from the viewpoint of improving the strength and imparting necessary strength.

１ The first absorbent contains a surfactant having or not having antibacterial properties. Thereby, the hydrophilicity of the wastewater treatment absorber is improved, and the speed of absorbing urine and the like can be improved. As a result, as will be described later, the water absorption amount and the water absorption speed are improved in combination with the low density and high porosity of the wastewater treatment absorber.

(4) When the surfactant has antibacterial properties, the growth of bacteria that generate ammonia by decomposing sewage such as urine can be suppressed, so that the surfactant can be used for a long period of time without emitting malodor to the surroundings. On the other hand, when the surfactant has no antibacterial property, the same effect can be exhibited by using the surfactant in combination with the antibacterial agent.

カ チ オ ン As the surfactant having antibacterial properties, a cationic surfactant or an amphoteric surfactant can be used. As the cationic surfactant, for example, alkyltrimethylammonium chloride, dialkyldimethylammonium chloride, benzalkonium chloride, or the like can be used alone or in combination of two or more thereof. It is preferable to use benzalkonium. As the amphoteric surfactant, for example, alkyldimethylaminoacetic acid betaine, alkyldimethylamine oxide, alkylcarboxymethylhydroxyethylimidazolinium betaine, alkylamidopropyl betaine, and the like may be used alone or in combination of two or more. It is particularly preferable to use alkyldimethylamine oxide from the viewpoint of antibacterial and deodorant properties. In addition, in order to further improve the antibacterial property of the plate-shaped wastewater treatment absorber, the surfactant having antibacterial property may be used in combination with an antibacterial agent. In this case, the antibacterial agent is preferably a water-soluble one.

The first absorbent preferably contains 0.1 to 5% by weight, particularly 0.5 to 3% by weight of the surfactant having antibacterial property, so that the absorbability of urine and other contaminants is improved. It is preferable because it can be used for a long period of time while preventing the emission of offensive odor.

非 A nonionic surfactant can be used as the surfactant having no antibacterial property. Examples of the nonionic surfactant include glycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene glycol fatty acid ester, and the like. In particular, it is preferable to use a nonionic surfactant having an HLB calculated by the HLB-dispersion method of 10 to 19 from the viewpoint of solubility in water. The antibacterial agent used in combination with the surfactant having no antibacterial property is preferably a water-soluble one. For example, sodium benzoate, chloramine T, chlorcresol, sodium salicylate, ethyltrimethylammonium bromide, Potassium sorbate, sodium dehydroacetate, parachlorophenol, phenol and the like can be used alone or in combination of two or more thereof. In particular, it is preferable to use sodium benzoate from the viewpoint of odor and safety for animals. .

The first absorbent preferably contains a surfactant having no antibacterial property in an amount of 0.01 to 5% by weight, more preferably 0.1 to 5% by weight, particularly 0.1 to 2% by weight. Preferably, the antimicrobial agent is contained in an amount of 0.001 to 5% by weight, more preferably 0.1 to 0.5% by weight.

The binder, the cross-linking agent or the water is used as a binder for the vegetable fiber and the pulp (hereinafter, these components are collectively referred to as an inter-fiber binder).
By containing these inter-fiber binders in the sewage treatment absorber, practically necessary strength can be imparted to the sewage treatment absorber, excellent in handleability and disposal properties, and can be used for a long time. It can be a wastewater treatment absorber.

に お い て In the present specification, the “crosslinking agent” refers to a substance that crosslinks between fibers by hydrogen bonding, and can be particularly preferably used when a wastewater treatment absorbent is produced by a wet production method described later. The term "binder" refers to an adhesive (a substance used for bonding two solids of the same or different types) excluding the "crosslinking agent".

As the binder, for example, polyvinyl alcohol, modified starch, agar, carboxymethylcellulose, polyacrylamide, and the like can be used alone or in combination of two or more. In particular, from the viewpoint of water absorption, polyvinyl alcohol and / or It is preferable to use modified starch. Furthermore, it is preferable that both the polyvinyl alcohol and the modified starch have a gelatinization temperature of 60 ° C. or higher, particularly 70 to 80 ° C. When the gelatinization temperature of these binders is 60 ° C. or higher, the binders do not dissolve in the used wastewater treatment absorber which is in a wet state at room temperature. The strength is kept constant, the shape does not collapse, and the handling and disposal are easy.
The first absorber preferably contains the binder in an amount of 1 to 45% by weight, more preferably 5 to 45% by weight, especially 7 to 20% by weight.

As the cross-linking agent, those generally used as a paper strength agent in a wet papermaking method can be used, for example, polyamidoamine / epichlorohydrin resin, polyacrylamide, polyethylene, methylolated polyacrylamide, etc., by one or more of these. Can be used. The crosslinking agent can be used alone as an inter-fiber binder, or water can be used in combination as a medium.
The first absorber preferably contains 0.01 to 3% by weight, more preferably 0.3 to 1% by weight of the crosslinking agent.

場合 When only water is used as the binder for the vegetable fiber or the like, the water content of the first absorber is preferably 1 to 20% by weight, more preferably 5 to 20% by weight.

The first absorbent may be deodorized, if necessary, in addition to the above-mentioned components (soil absorbing substrate, surfactant having or not having antibacterial properties, antibacterial agent and inter-fiber binder). An additive such as an agent or a masking agent can be appropriately contained. The content of these additives is preferably 0.01 to 1% by weight, more preferably 0.03 to 0.1% by weight.

The first absorber has a thickness of 3 mm or more, preferably 5 to 50 mm, more preferably 10 to 10, obtained by mixing a mixture obtained by mixing the above-mentioned components and the additives used as necessary. It is formed into a 20 mm flat plate. The wastewater treatment absorber formed into a flat plate having a predetermined thickness as described above has a greater amount of water absorption of urine and the like and a higher strength than a paper-like sheet. Further, unlike a granular type wastewater treatment absorber, dust is hardly generated during handling, and disposal is easy.

The thickness is measured as follows.
<Method of measuring thickness>
The thickness at each location was measured by applying a micro gauge (thickness measuring device) at intervals of 10 cm along the width direction of the first absorber, and the average value thereof was defined as the thickness of the first absorber.

The first absorbent has a bulk density of 0.05 to 0.3 g / cm ³ , preferably 0.1 to 0.25 g / cm ^3, and more preferably 0.15 to 0.2 g / cm ³ . ing. By setting the bulk density within the above range, it is possible to improve the absorption rate of the waste liquid while maintaining the required strength as a molded product.
Since the first absorber is a low-density body whose bulk density is within the above range and is a porous body as described above, it releases water contained in the absorbed waste liquid under low humidity, It is possible to absorb the waste liquid which the first absorbent body originally has, which is equal to or greater than the water absorption measured by the measurement method described later.

The bulk density is measured by the following method.
<Method of measuring bulk density>
From the first absorber, a test piece (volume 36 cm ³ ) having a length of 6 cm, a width of 6 cm and a thickness of 1 cm was cut, the weight of the test piece was measured, and the bulk density (g / cm ³ ) was calculated by the following formula. I asked.
Bulk density (g / cm ³ ) = weight (g) / 36 (cm ³ )

The first absorber is excellent in water absorption, and has a saturated water absorption of 2 g / 1 g or more, preferably 5 g / 1 g or more, more preferably 8 g / 1 g or more, and the water absorption rate is 30 g / g. The time is at most 10 seconds, preferably at most 10 seconds, more preferably at most 3 seconds. The upper limit of each of the saturated water absorption and the water absorption rate is not limited and is preferably as high as possible. However, in practice, the upper limit of the saturated water absorption is about 5 g / 1 g, and the upper limit of the water absorption rate is about 1 second.

The saturated water absorption is measured by the following method.
<Method of measuring saturated water absorption>
From the first absorber, a test piece of 60 mm in length and 60 mm in width is cut as it is, and the test piece is dried in a dryer set at 105 ° C. for 1 hour, and then transferred into a desiccator to room temperature. Allow to cool. Then, using a device (Demand Wettability Tester) generally known as a device for performing the DW method, the test piece was placed on a glass filter in which the level of the physiological saline in the burette was set at an equal water level, The stopcock is opened and the test piece is allowed to absorb physiological saline, and the amount of water absorbed when no bubbles are generated (the amount of water absorbed is measured on a burette scale indicating the decrease in the level of the physiological saline). Was measured, and this value was defined as the saturated water absorption (g) (average value of n = 3; measurement was performed once for each test piece).

The water absorption rate is measured by the following method.
<Method of measuring water absorption rate>
From the first absorber, a test piece of 60 mm in length and 60 mm in width is cut as it is, and the test piece is dried in a dryer set at 105 ° C. for 1 hour, and then transferred into a desiccator to room temperature. Allow to cool. 2.5 cc of physiological saline was dropped at the center of the test piece, the time from immediately after dropping until the water drop was absorbed by the test piece was measured, and this was taken as the water absorption rate (second) (average of n = 3). Value, one measurement per specimen).

湿潤 The first absorber has a wet strength of 49 cN or more, preferably 98 cN or more, more preferably 196 cN or more. The first absorber having a wet strength equal to or more than the above value can maintain a flat plate shape even when it absorbs urine and the like and becomes wet, so that it is easy to handle and dispose. The upper limit of the wet strength is not limited, and the higher the better, the better. However, the actual upper limit is about 196 cN from the viewpoint of balance with other required strengths.

The wet strength is measured by the following method.
<Method of measuring wet strength>
From the first treated absorbent, a test piece having a length of 80 mm and a width of 25 mm was cut as it was, and the test piece was immersed in water for 5 minutes. After immersion, the test piece is placed on two triangular prism-shaped supports provided at intervals of 50 mm such that the longitudinal center of the test piece is located at the center between the two supports. Thereafter, the push-pull cage was pressed against the center of the test piece, and the gauge pressure when the test piece was broken was measured, and this was defined as the wet strength (cN) (average value of n = 3).

と す る In order to obtain a wastewater treatment absorber that satisfies each of the physical properties such as the bulk density described above, it is preferable to manufacture the wastewater-absorbing substrate made of ground pulp by a manufacturing method described below. Since the ground pulp contains a large amount of lignin having high rigidity and a large amount of hemicellulose having a high water absorption, the wastewater treatment absorber containing the predetermined amount of the ground pulp is a wastewater treatment product containing ordinary chemical pulp. The bulk density is lower, the bulkiness is thicker, and the saturated water absorption and the water absorption speed are higher than those of. In addition, since the ground pulp itself has a certain degree of deodorizing and antibacterial effect, an antibacterial agent (an antibacterial agent or a surfactant having an antibacterial property) is further blended into the wastewater treatment / absorbing base material composed of the ground pulp. In addition, if a deodorant is appropriately added as needed, a wastewater treatment absorber that does not emit malodor for a long period of time and can be used in a sanitary manner can be obtained. In addition, when using ground pulp, when the content increases, the strength of the wastewater treatment absorbent, particularly the wet strength tends to decrease, but the first absorbent used in the wastewater treatment system of the present invention is As described above, since the above-mentioned predetermined amount of the interfiber binder is contained, it has practically sufficient strength and wet strength. In addition, depending on the inter-fiber binder used, the hydrophilicity of the absorbent may be reduced, and the absorbency of the waste liquid may be reduced. However, the absorbent contains the surfactant in the predetermined amount as described above. As a result, not only the decrease in hydrophilicity due to the use of the inter-fiber binder is prevented, but also the absorbent has a water absorption capacity greater than the original water absorption capacity of the ground pulp. It has become.

The first absorber can be manufactured by any of a dry method and a wet method. As a dry production method, for example, a mixture of a surfactant, an antibacterial agent and a binder as an interfiber binder is mixed with a vegetable fiber or the like which is a raw material of a waste liquid absorbing base material, and the mixture is subjected to a predetermined process. A method in which the plate-shaped material is put into a shape mold to form a plate-like material, and the plate-like material is subjected to a hot press treatment to be preliminarily dehydrated, and then dried with a dryer or the like until a desired moisture content is obtained. Can be adopted. At this time, the conditions of the hot press treatment are as follows: from the viewpoint of setting the bulk density within the above range and setting the thickness to the above value, the press pressure is preferably 4 to 2400 kPa, more preferably 10 to 1000 kPa, and the press temperature is preferably Is 60 to 120 ° C, more preferably 20 to 105 ° C, and the pressing time is 0.5 to 20 minutes, more preferably 3 to 5 minutes. On the other hand, as a wet production method, for example, a long net papermaking method, a circular net papermaking method, and the like which are performed in the production of general paper can be adopted, and a known paper machine can be used. In the wet production method, a cross-linking agent (paper strength agent) is suitably used as the inter-fiber binder as described above.

る の で Because the first absorber is a fixed type, it is easy to handle without generating dust like the granular type wastewater treatment absorber. Further, at the time of use, the wastewater treatment absorber has a high deodorizing effect and can suppress the emission of offensive odors by the antibacterial effect, so that there is no need to consider the installation location and it can be used hygienically. Furthermore, since the absorbent has a large amount of absorption of urine and the like and is excellent in absorbability, it can be used for a long time in combination with the high deodorizing effect and antibacterial effect. After use, the wastewater treatment absorber has a high wet strength and can maintain a flat plate shape even when it absorbs urine and the like, so that it can be easily taken out and easily incinerated as combustible waste.

前 記 The second absorber in the wastewater treatment system of the present invention is a clay mineral formed into a plate.

粘土 Kaolin, bentonite, zeolite, diatomaceous earth, etc. are used as the clay mineral used for the second absorber.

The second absorber mixes the clay mineral, water and binder pulverized to a predetermined particle size into a slurry, pours the slurry into a mold having a predetermined shape, and at a predetermined temperature until a predetermined moisture content is reached. After drying, it is removed and made.
Examples of the binder used for producing the second absorbent include corn starch, potato starch, tapioca starch, methyl cellulose, carboxymethyl cellulose, and the like.
The mixing ratio of the clay mineral in the slurry used for producing the second absorber is preferably 80 to 95% by weight, and 88 to 92% by weight in view of water absorption, deodorization, and cost. Is more preferable. Further, the mixing ratio of the binder in the slurry is preferably 5 to 15% by weight, more preferably 8 to 12% by weight, from the viewpoint of ensuring the preservation.

The third absorber in the wastewater treatment system of the present invention is a material in which an absorbent composition in which pulp and a water-absorbing polymer are mixed at a predetermined mixing ratio is wrapped in a sheet of nonwoven fabric or the like to form a sheet. is there.

パ ル Pulps used for the third absorbent include chemical pulp and mechanical pulp. The mixing ratio of pulp in the absorbent composition is preferably from 70 to 90% by weight, and more preferably from 80 to 85% by weight.

The water-absorbing polymer used for the third absorber includes starch-acrylic acid copolymer, cross-linked polyacrylate, copolymer of vinyl ester and unsaturated carboxylic acid, isobutylene-maleic anhydride copolymer , A starch-acrylonitrile copolymer crosslinked product, a hydrolyzate thereof, a crosslinked carboxymethyl derivative, a crosslinked polyethylene oxide derivative, a partially hydrolyzed polyacrylamide, a crosslinked polyvinyl alcohol, and the like. The mixing ratio of the water-absorbing polymer in the absorbent composition is preferably from 10 to 30% by weight, and more preferably from 15 to 20% by weight. These water-absorbing polymers can be used in any shape, such as powder, granule, granule, granule, scale, lump, bead, and fiber. In view of this, it is preferable to use a powdery or granular material.

不 織布 A non-woven fabric such as a heat-rolled non-woven fabric or an air-through non-woven fabric is used for the sheet used for the third absorber. Among these, a heat-rolled non-woven fabric is preferably used in terms of cost.

In the production of the third absorbent body, the pulp and the water-absorbing polymer are mixed by a usual mixing method to produce the absorbent composition, and the absorbent composition is included in the sheet and formed into a sheet. It can be manufactured.

The bed sand in the wastewater treatment system of the present invention is preferably spherical or cylindrical in that it allows the wastewater to penetrate downward without accumulating. The bed sand has a diameter of 2 to 8 mm from the viewpoint of not spilling down from the liquid passage hole of the soot when the sand is laid on the above-mentioned sandbag, and not blocking the passage of the soot to prevent passage of the waste liquid. And more preferably 4 to 6 mm.
The bedding sand has the above-mentioned form and is not particularly limited in its material as long as it has corrosion resistance to the wastewater to be treated, but from the viewpoint of deodorization, wood, okara, soybean, coconut, rape, etc. And the like are preferably used.

The tray in the sewage treatment system of the present invention, the tray, the size of the tray, the sewage treatment absorber and the litter can be accommodated without hindrance, strength, if it has corrosion resistance, the material, The form is not particularly limited, but those made of a synthetic resin such as polypropylene, polyethylene, polyethylene terephthalate, vinyl chloride, and ABS are preferable from the viewpoint of ease of handling and moldability.

In the wastewater treatment system of the present invention, for example, when the pet urinates on the litter, urine exuding from between the litter passes through the liquid passage hole without staying on the upper surface of the litter, and the litter is contaminated. Immediately absorbed by the treatment absorber.

As described above, according to the sewage treatment system of the present embodiment, sewage such as urination of pets can be quickly absorbed, and furthermore, since sewage does not stay on the upper surface of the sand, bad odor can be reliably eliminated over a long period of time. Can be suppressed.

Next, a wastewater treatment method of the present invention will be described as a preferred embodiment based on an embodiment using the wastewater treatment system S of the above embodiment.

(1) First, as shown in FIG. 1, a sewage treatment absorber 2 is laid below a saw blade 1. It is preferable that the wastewater treatment absorber 2 and the saw blade 1 are arranged in the tray 3. In addition, it is preferable to lay a predetermined amount of the sand 4 on the saw blade 1. Then, for example, pets such as cats and dogs are urinated on the bed sand 4, and urine (filtration liquid) that has passed through the liquid passage holes of the scissors 1 is absorbed by the filth treatment absorber 2.

In the sewage treatment method of the present invention, when the sand is buried on the sawboard, the laying amount may be 1 to ³ g / cm ³ in terms of efficiently introducing the sewage into the absorber. More preferably, it is 1.5 to 2.5 g / cm ³ .

The present invention is not limited to the above embodiment, and can be appropriately changed without departing from the spirit of the present invention.
For example, the sewage treatment system of the present invention preferably uses the drape of the present invention as in the above-described embodiment, but other drapes, and the lower surface of the drape and the upper surface of the sewage treatment absorber are different from each other. It goes without saying that other blades can be used as long as they can be closely connected.

[Example 1]
The following mushrooms were placed on the following wet-processed sewage treatment absorber to prepare a sewage treatment system, and artificial urine having the following composition was applied at 30 ml / 10 seconds using a washing bottle. The stagnant state in the saw was visually observed. And it evaluated in the following stages. Table 1 shows the results.
<Sunoko>
External shape: rectangle (300 x 400 mm): peripheral wall height: 160 mm
Boundary section longitudinal cross-sectional shape: trapezoid (upper base = 1.5 mm, lower base = 2.5 mm)
Opening area at the upper end surface of the liquid passage hole: 4 mm x 4 mm
Opening area at the lower end face of the liquid passage hole: 3 mm x 3 mm
Material: Polypropylene <Sewage treatment absorber>
Dimensions: rectangle (300 x 300 mm), thickness (10 mm)
Wood fiber molding: (Composition composition: ground pulp: corn starch: water = 100: 10: 70)
Surfactant: Amphoteric surfactant ("Amphitol 20N" manufactured by Kao Corporation)
0.2% by weight (based on wood fiber)

[Comparative Examples 1 and 2]
A sewage treatment system was produced using the same shape as in Example 1 except that ribs 3 mm and 7 mm protruding downward were formed on the lower surface side. The retention state was examined. Table 1 shows the results.

(Evaluation of staying state)
◎: Almost none ○: Somewhat small △: Neither of them ●: Somewhat many ×: Many

As shown in Table 1, in the case of a sewage treatment system (product of the present invention) in which a lower surface of a boundary portion without a rib uses a flat surface and is closely contacted with an upper surface of a sewage absorber, artificial urine is placed on the upper surface of the sewage. There is almost no residue, and no liquid film is formed in the liquid passage hole, and urine is smoothly absorbed by the wastewater treatment absorber and does not give off odor. In the system, it was confirmed that urine stayed in the form of droplets on the upper surface of the soot and as a film in the liquid passage hole, causing a bad smell.

[Examples 2 to 4, Comparative Examples 3 to 6]
Example 1 A wastewater treatment system was produced using the same dumbbells as in Example 1 and the same wastewater absorber as in Example 1 except that the vertical cross-sectional shape of the boundary portion was changed to the form shown in Table 2. According to the same method as that described above, the state of retention of artificial urine in the grass was examined. Table 2 shows the results.

As shown in Table 2, in the case of a sewage treatment system using a ginger with a width of 2 mm or less in the vertical cross section of the gutter, almost no artificial urine remains on the upper surface of the gutter, and the flow of the artificial urine remains. No liquid film was formed on the liquid hole, and urine was smoothly absorbed by the sewage treatment absorber and did not give offfensive odor. On the other hand, when the width of the upper surface of the boundary in the vertical cross section of the boundary exceeded 2 mm. It was confirmed that urine stayed in the form of droplets on the upper surface of the soot, causing a bad smell.

[Example 5]
A commercially available toilet sheet (trade name "Deosheet" manufactured by Unihearts) was used as the same sawdust and wastewater absorber as in Example 1, and the wastewater absorber was placed on the sawdust to produce a wastewater treatment system. Then, artificial urine was applied in the same manner as in Example 1, and the state of retention of the artificial urine in the corn was visually observed. As a result, it was confirmed that almost no urine stayed in the sward, and that almost all of the applied urine was absorbed by the waste liquid absorber.

BRIEF DESCRIPTION OF THE DRAWINGS It is the schematic which shows one Embodiment of the waste liquid treatment system of this invention, (a) is sectional drawing of the whole structure, (b) is an expanded sectional view of a principal part structure. It is the schematic which shows this one Embodiment of this invention, (a) is a top view and (b) is a front sectional view. It is a figure which shows the example of the external shape of the longitudinal cross section of the boundary part in the grinder of this invention, (a) is a rectangular cross section, (b) is a trapezoid cross section, (c) is an inverted trapezoid cross section, (d) is a circular cross section. is there.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Slope 1a Liquid passage hole 10,11 Boundary part 2 Sewage treatment absorber 3 Tray 4 Sand S Sewage treatment system

Claims (4)

In particular, the present invention provides a sewage treatment system including a plate-like or sheet-like sewage treatment absorber laid below the sink, wherein the saw has a large number of through-holes, A sewage treatment system in which a vertical section of a boundary portion of a liquid hole is trapezoidal, triangular, or circular, and a lower surface of the sink is in close contact with an upper surface of the sewage treatment absorber. The wastewater treatment system according to claim 1, wherein the lower surfaces of the boundaries between the liquid passage holes are substantially flush with each other. (3) The wastewater treatment system according to (1) or (2), wherein the width of the upper surface of the boundary in the vertical section of the boundary is 2 mm or less. A sewage treatment method using the sewage treatment system according to any one of claims 1 to 3, wherein the plate-like or sheet-like sewage treatment absorber is laid below the dish, A sewage treatment method in which the sewage that has passed through the saw blade is absorbed by the sewage treatment absorber.

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