JP3522664B2 - Wastewater treatment system - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to sewage, particularly cats,
About the dirty liquid processing system of urination such as a pet such as a dog.

[0002]

2. Description of the Related Art As a prior art relating to a urine disposal system for pets such as cats and dogs, a pet manure disposal bed described in JP-A-7-67489 is known. . In this manure treatment floor, the inside of the tray is divided into upper and lower parts by a wire mesh or a porous member such as punching metal, and sand having a water-repellent function is laid above the tray, and the absorbent resin having a high water-retaining property is formed below. The urine absorbing member is laid so that the urine that has passed through the sand is retained inside the urine absorbing member.

By the way, in the above-mentioned manure treatment bed, since no consideration is given to the urination accumulated in the porous member, there is a problem that when the urine is accumulated on the upper surface of the porous member, a bad odor is emitted. . In addition, when a reinforcing rib or the like is formed on the porous member, a gap is generated 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. , As well, had a stinking problem.

It is therefore an object of the present invention, malodor that can reliably prevent suppressing the retention of contaminated liquids, contaminated liquids processing system
To provide.

[0005]

The present invention relates to a sewage treatment system comprising a soot and a plate-like or sheet-like sewage treatment absorber laid below the sutter, which comprises Has a large number of liquid passage holes, the lower surfaces of the boundary portions of the respective liquid passage holes are substantially flush with each other, and a molten resin injection pin is injected on the lower surface side.
It is integrally molded with general-purpose synthetic resin so that the recessed portion remains
The above object is achieved by providing a sewage treatment system in which the lower surface of the soot and the upper surface of the sewage treatment absorber are in close contact with each other.

[0006]

[0007]

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will now be described based on its preferred embodiments with reference to the drawings.

FIG. 1 shows an embodiment of a wastewater treatment system of the present invention using the sludge of the present invention. In the figure, the symbol S indicates a waste liquid treatment system.
The sewage treatment system S of the present embodiment includes a drainboard 1 and a plate-shaped sewage treatment absorber 2 laid below the drainboard 1. The lower surface of the drainboard 1 and the upper surface of the wastewater treatment absorber 2 are in close contact with each other. As shown in the figure, the sewage treatment system S is preferably constructed by laying the sludge 1 and the sewage absorber 2 in a tray 3 and laying sand 4 on the sludge 1.

As shown in FIG. 2, the drainboard 1 has a large number of liquid passage holes 1a, and the longitudinal section of the boundary portion 10 is formed in a predetermined shape, and the lower surface of the boundary portions 10 (11) is formed. It is formed to be substantially flush. Also, as shown in the figure,
The drainboard 1 has a rectangular outer shape in a plan view.
Reinforcing ribs or the like are not formed on the lower surface of the sludge 1, and the lower end surface of the boundary portion 10 is substantially flush so that the lower surface of the sludge and the upper surface of the wastewater treatment absorber 2 can be in close contact with each other without a gap. Is formed in.

In the sludge of the present invention, the boundary portion forming the skeleton is shown in FIG. 3 in that the waste liquid can be guided to the absorbent body without remaining on the upper surface of the sludge (the upper surface of the boundary portion). As described above, when the vertical cross-sectional shape is quadrangular or trapezoidal, the width a of the upper surface of the boundary portion is preferably 2 mm or less, and more preferably 1 mm or less. When the boundary has a circular vertical cross-sectional shape, the radius R is preferably 2 mm or less, and more preferably 1 mm or less.

In the sludge of the present invention, the cross-section (horizontal cross-section) form and arrangement of the liquid passage holes are not particularly limited as long as the cross-section form and arrangement are such that the boundary portion is within the above range.
From the viewpoint of formability, strength, shape of paved sand, etc., for example, the cross-sectional shape of the hole may be 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 preferable that each of the liquid passage holes is arranged in the closest packing (for example, a regular hexagon has a honeycomb shape).

The saw blade of the present invention has a boundary portion 11 shown in FIG.
As described above, the strength can be increased by increasing the height of a part of the boundary portion or increasing the width thereof as necessary. In this case as well, all the lower surfaces of the boundary portion are formed flush with each other.

As shown in FIG. 2, the sludge of the present invention is provided with a peripheral wall portion 12 from the viewpoint that the sludge can be washed together with the sludge when it is laid on the sludge, as shown in FIG. Is preferred. The height of the peripheral wall is 50 to 300
mm is preferable, and 100 to 200 mm is more preferable.

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

The material for forming the soot of the present invention is not particularly limited as long as it has corrosion resistance to the sewage to be treated, but is lightweight, easy to handle and has good moldability. For example, polypropylene, polyethylene, It is preferable to integrally mold a general-purpose synthetic resin such as polyethylene terephthalate, vinyl chloride or ABS.

The sludge of the present invention can be integrally formed by injection molding the above-mentioned synthetic resin, but in injection molding, it is designed so that the injection mark of the injection pin of the molten resin remains on the lower surface side. It is preferable to perform molding with a molded die. 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 a bad odor.

In order to improve the surface wettability and enhance the liquid passing performance, it is preferable that the sludge of the present invention is subjected to a water repellent treatment or an antibacterial treatment. The water repellent treatment and the antibacterial treatment can be performed by using a usual method.

In the thus constructed soot, the sewage that has passed through the spread sand laid above it reaches the inside of the liquid passage hole, immediately passes through the liquid passage hole, and stays on the upper surface of the soup. Or, since it does not stay by forming a liquid film in the liquid passage hole,
It is possible to reliably prevent the generation of offensive odors.

The sewage treatment absorber used in the sewage treatment system of the present invention is formed into a plate shape or a 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 in intimate contact with each other over the entire surface, but it is preferable that the contact area is at least 80% or more.
% Or more is more preferable. 80% of the contact area
If it is less than 1, the bad odor due to the retention of urine 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 a sludge having a convex portion such as a reinforcing rib on the lower surface is used. In this case, it is also possible to use a form having a concave portion corresponding to the convex portion, whereby the both can be brought into close contact with each other. As described below, the sewage treatment absorber is formed by mixing a sewage absorption base material mainly composed of plant fibers or pulp with a surfactant or the like to form a plate (also referred to as a first absorber). A sheet made of clay mineral (also referred to as a second absorber), a sheet made by wrapping a mixture of pulp and a water-absorbing polymer in a sheet such as a nonwoven fabric (also referred to as a third absorber) Is. The first absorbent body is formed by mixing a sewage absorbing base material with a surfactant or a surfactant and an antibacterial agent having antibacterial properties, and a binder, a crosslinking agent or at least one kind of water. It will be done.

The sewage absorbing substrate is mainly composed of vegetable fiber or pulp. The sewage treatment absorber comprising such a sewage absorption base material mainly composed of plant 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 discarded as combustible waste after use.
In the present specification, the “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. Further, the "pulp" means a substance having a high cellulose purity 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, the deodorizing effect, and the stable supply.
Ground pulp (GP) is also called groundwood pulp and is so-called mechanical pulp. For mechanical pulp, GP
In addition to stone groundwood pulp (SGP), refiner groundwood pulp (RGP), thermomechanical pulp (TM)
P), etc., but these are collectively referred to as ground pulp in this specification. Among ground pulps, stone groundwood pulp is particularly preferably used from the viewpoint of deodorizing effect. Further, it is preferable to use waste paper pulp as the pulp, but it is particularly preferable to use deinking treated pulp from the viewpoint of water absorption. The plant fiber and the pulp may be used alone as the sewage absorbing base material, or may be mixed and used as the sewage absorbing base material. When both are mixed, the mixing ratio (weight) of vegetable fiber and pulp is from vegetable fiber: pulp = 10: 1.
It can be appropriately selected within the range of 1: 100.

The first absorbent body preferably contains 50 to 95% by weight, particularly 70 to 90% by weight, of the vegetable fiber, the pulp or a mixture thereof in order to absorb sewage such as urine and the like. It is preferable from the viewpoint of improving the deodorizing effect and imparting necessary strength.

The first absorber contains a surfactant with or without antibacterial properties. As a result, the hydrophilicity of the sewage treatment absorber can be improved, and the absorption rate of urine or 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.

When the above-mentioned surfactant has antibacterial properties, it can suppress the propagation of bacteria that decompose sewage such as urine to produce ammonia, so that it can be used for a long period of time without emitting a bad odor to the surroundings. On the other hand, when the surfactant does not have antibacterial properties, the same effect can be exhibited by using the surfactant in combination with the antibacterial agent.

As the above-mentioned surfactant having antibacterial property,
Cationic or amphoteric surfactants can be used. As the cationic surfactant, for example, alkyltrimethylammonium chloride, dialkyldimethylammonium chloride, benzalkonium chloride and the like can be used alone or in combination of two or more thereof. Preference is given to using benzalkonium. As the amphoteric surfactant, for example, alkyldimethylaminoacetic acid betaine, alkyldimethylamine oxide, alkylcarboxymethylhydroxyethylimidazolinium betaine, alkylamidopropyl betaine, etc. may be used alone or in combination of two or more thereof. In particular, it is preferable to use alkyldimethylamine oxide from the viewpoint of antibacterial deodorant property. still,
In order to further improve the antibacterial property of the plate-shaped wastewater treatment absorber, the above-mentioned surfactant having antibacterial property may be used in combination with the antibacterial agent. In this case, the antibacterial agent is preferably water-soluble.

The first absorber preferably contains 0.1 to 5% by weight, especially 0.5% by weight of the surfactant having antibacterial properties.
The content of 3 to 3% by weight is preferable because the absorbability of sewage such as urine is improved, the emission of a bad odor is prevented, and the composition can be used for a long time.

A nonionic surfactant can be used as the above-mentioned surfactant having no antibacterial property. As the nonionic surfactant, for example, glycerin fatty acid ester, sorbitan fatty acid ester, polyoxyethylene sorbitan fatty acid ester, polyoxyethylene alkyl ether, polyoxyethylene glycol fatty acid ester, etc. may be used alone or in combination of two or more. From the viewpoint of being soluble in water, it is particularly preferable to use a nonionic surfactant having an HLB of 10 to 19 calculated by the HLB-dispersion method. The antibacterial agent used in combination with the non-antibacterial surfactant is preferably a water-soluble antibacterial agent, 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, and it is particularly preferable to use sodium benzoate from the viewpoint of odor and safety to animals.

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

The binder, crosslinking agent or water is used as a binder for the vegetable fiber and the pulp (hereinafter, these components are collectively referred to as interfiber binder). By containing these interfiber binders in the sewage treatment absorber, the strength required for practical use can be imparted to the sewage treatment absorber, which is excellent in handleability and disposal and can be used for a long period of time. It can be used as a sewage treatment absorber.

In the present specification, the term "crosslinking agent" means an agent that crosslinks between fibers by hydrogen bond, and can be particularly preferably used when a sewage treatment absorbent is produced by a wet production method described later. Further, the "binder" refers to an adhesive (a substance used for the purpose of bonding two solids of the same kind or different kinds) without the above "crosslinking agent".

As the binder, for example, polyvinyl alcohol, modified starch, agar, carboxymethyl cellulose, polyacrylamide and the like can be used alone or in combination of two or more thereof. Particularly, from the viewpoint of water absorption, polyvinyl alcohol is used. And / or modified starch is preferably used. Further, both polyvinyl alcohol and modified starch have a gelatinization temperature of 60 ° C. or higher, particularly 70-80.
C. is preferred. When the gelatinization temperature of these binders is 60 ° C. or higher, the binder does not dissolve in the used sewage treatment absorbent in a wet state at room temperature. The strength is kept constant and the shape does not collapse, and it is easy to handle and discard. The first absorber preferably contains 1 to 45% by weight, more preferably 5 to 45% by weight, and especially 7 to 20% by weight of the binder.

As the cross-linking agent, those generally used as a paper strengthening agent in the wet papermaking method can be used. For example, polyamidoamine-epichlorohydrin resin, polyacrylamide, polyethylene, methylolated polyacrylamide and the like can be used. It can be used in more than one species. The cross-linking agent may be used alone as an interfiber binder, or may be used in combination with water as a medium. First
The absorber preferably contains 0.01 to 3% by weight, more preferably 0.3 to 1% by weight, of the crosslinking agent.

When only water is used as the binder for the vegetable fibers and the like, the water content of the first absorber is preferably 1
-20% by weight, more preferably 5-20% by weight.

The first absorbent body contains, in addition to the above-mentioned components (sewage absorbing base material, surfactant with or without antibacterial property, antibacterial agent and interfiber binder), if necessary. , Additives such as deodorants and masking agents can be appropriately contained. The content of these additives is preferably 0.01 to
It is 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 a mixture obtained by mixing the above-mentioned components and the above-mentioned additives used as necessary. Is formed into a flat plate of 10 to 20 mm. Thus, the sewage treatment absorber formed in a flat plate shape having a predetermined thickness has a larger amount of water absorption such as urine and a higher strength than that of a paper sheet. Further, unlike the granular type wastewater treatment absorber, dust is hardly generated during handling, and it is easy to dispose.

The thickness is measured as follows. <Method of measuring thickness> 1 along the width direction of the first absorber
A micro gauge (thickness measuring instrument) was applied at intervals of 0 cm to measure the thickness at each location, and the average value of these was used as the thickness of the first absorber.

The first absorber has a bulk density of 0.05 to
0.3 g / cm ³ , preferably 0.1-0.25 g / c
m ³ , more preferably 0.15 to 0.2 g / cm ³ . 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 absorbent body is a low-density body having a bulk density 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 amount of sewage which the first absorbent body originally has and which is equal to or more than the water absorption amount measured by the measuring method described later.

The bulk density is measured by the following method. <Measurement method of bulk density> From the first absorber, length 6 cm, width
6 cm, 1 cm thick test piece (volume 36 cm ³) Is cut
Then, the weight of the test piece is measured, and the bulk density (g
/ Cm³) Was asked. Bulk density (g / cm³) = Weight (g) / 36 (cm³)

The first absorber is excellent in water absorption and has a saturated water absorption of 2 g / 1 g or more, preferably 5 g.
/ G or more, more preferably 8g / 1g or more, the water absorption rate is 30 seconds or less, preferably 10 seconds or less, more preferably 3 seconds or less. It should be noted that there is no limit to the upper limit of the saturated water absorption amount and the water absorption speed, and the higher the higher, the more preferable. However, the upper limit of the saturated water absorption amount is actually 5 g / 1 g.
The upper limit of the water absorption speed is about 1 second.

The saturated water absorption is measured by the following method. <Measurement method of saturated water absorption amount> A test piece having a thickness of 60 mm and a width of 60 mm was cut from the first absorbent body, and the test piece was dried for 1 hour in a dryer set at 105 ° C. Then, it was transferred to a desiccator and cooled to room temperature. Then, using a device (Demand Wettability Tester) generally known as a device for carrying out the DW method, the test piece was placed on a glass filter in which the liquid level of physiological saline in a buret was set to an equal water level, A stopcock is opened to allow the test piece to absorb physiological saline, and the amount of water absorbed when no bubbles are generated (the amount of water absorbed is measured with a burette scale indicating the amount of decrease in the level of physiological saline). Was measured, and this value was defined as the saturated water absorption (g) (average value of n = 3. Test piece 1
Once per measurement).

The water absorption rate is measured by the following method. <Measurement Method of Water Absorption Speed> From the first absorbent body, a test piece having a thickness of 60 mm in length and 60 mm in width was cut, and the test piece was dried in a dryer set at 105 ° C. for 1 hour. It was transferred to a desiccator and cooled to room temperature. 2.5 cc of physiological saline was dropped in the center of the test piece, and the time immediately after the dropping until the water droplet was absorbed by the test piece was measured,
This was defined as the water absorption rate (second) (average value of n = 3. One test piece was measured once).

The first absorber has a wet strength of 49 cN or more, preferably 98 cN or more, more preferably 196 cN.
It is N or more. First with a wet strength of at least the above value
The absorbent body can maintain its flat plate shape even if it absorbs urine or the like and becomes wet, so that it is easy to handle and discard. The upper limit of the wet strength is not limited, and the higher the wet strength, the better, but from the viewpoint of balance with other necessary strength,
The actual upper limit is about 196 cN.

The wet strength is measured by the following method. <Method of measuring wet strength> From the first treated absorbent body, a test piece having a thickness of 80 mm and a width of 25 mm was cut as it was,
The test piece was immersed in water for 5 minutes. After immersion, the test piece was
The test piece is placed on two triangular prism-shaped supports provided at intervals of 50 mm so that the central part of the test piece in the vertical direction is located at the center between the two supports. Then, a 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 taken as the wet strength (cN) (average value of n = 3).

In order to obtain a sewage treatment absorber satisfying the above-mentioned physical properties such as bulk density, it is preferable to use the sewage absorption base material made of ground pulp and to produce it by the production method described later. Since the ground pulp contains a large amount of highly rigid lignin and highly water-absorbing hemicellulose, the sewage treatment absorber containing the predetermined amount of the ground pulp is a sewage treatment formed product containing an ordinary chemical pulp. Compared with, bulk density is low, bulky and thick, and saturated water absorption amount and water absorption rate are large. In addition, since the ground pulp itself has some deodorant / antibacterial effect, the sewage treatment and absorption base material made of ground pulp further has an antibacterial agent (antibacterial agent or surfactant having antibacterial property).
If a deodorant is appropriately blended in addition to the above, a sewage treatment absorber which does not emit a bad odor for a long period of time and can be used sanitarily can be obtained. When ground pulp is used, if its content increases, the strength of the sewage treatment absorber,
In particular, the wet strength tends to decrease, but the first absorbent body used in the sewage treatment system of the present invention contains the interfiber binder in the predetermined amount as described above, and therefore has a practically sufficient strength. And wet strength. Further, depending on the interfiber binder used, the hydrophilicity of the absorber may be lowered, and the absorbability of waste liquid may be lowered, but the absorber contains the predetermined amount of the surfactant as described above. Therefore, not only the decrease in hydrophilicity due to the use of the interfiber binder is prevented, but also the absorbent body is given a water absorption capacity higher than the original water absorption capacity of the ground pulp, resulting in an excellent absorption of waste liquid. It has become a thing.

The first absorber can be manufactured by either a dry method or a wet method. As a dry manufacturing method, for example, a vegetable fiber or the like which is a raw material of the sewage absorbing base material is mixed with a surfactant, an antibacterial agent and a binder which is an interfiber binder to obtain a mixture, and the mixture is predetermined. A method in which a plate-shaped product is placed in a shaped mold, the plate-shaped product is subjected to hot press treatment for preliminary dehydration, and then the plate-shaped product is dried to a desired water content by a dryer or the like. Can be adopted. At that time, the press pressure is preferably 4 to 24 from the viewpoint that the bulk density is within the above range and the thickness is not less than the above value.
00 kPa, more preferably 10 to 1000 kPa, the pressing temperature is preferably 60 to 120 ° C., more preferably 20 to 105 ° C., and the pressing time is 0.5 to 2
0 minutes, more preferably 3 to 5 minutes. On the other hand, as a wet manufacturing method, for example, a Fourdrinier paper making method or a cylinder paper making method, which is used in the manufacture of general paper, can be adopted, and a known paper machine can be used. In the wet manufacturing method, the crosslinking agent (paper strengthening agent) is preferably used as the interfiber binder as described above.

Since the first absorber is of a fixed shape, it does not generate dust unlike the granular type sewage treatment absorber and is easy to handle. Further, when used, the sewage treatment absorbent has a high deodorizing effect and can suppress the emission of bad odors due to the antibacterial effect, so that it can be used hygienically without considering the installation place. Furthermore, since the absorbent body has a large amount of absorbed urine and the like and is excellent in absorbability, it can be used for a long period of time in combination with its high deodorant effect and antibacterial effect. After use, the sewage treatment absorber has a high wet strength and can maintain a flat plate shape even when absorbing urine and the like, so that the sewage treatment absorber can be easily taken out and can be easily incinerated and discarded as combustible waste.

The second absorber in the wastewater treatment system of the present invention is formed by molding clay mineral into a plate shape.

Clay minerals used for the second absorber include
Kaolin, bentonite, zeolite, diatomaceous earth, etc. are used.

The second absorber is made into a slurry by mixing the clay mineral crushed to a predetermined particle size, water and a binder, and the slurry is poured into a mold having a predetermined shape until a predetermined water content is reached. It is manufactured by drying after drying at a predetermined temperature. Examples of the binder used for producing the second absorbent body include corn starch, potato starch, tapioca starch, methyl cellulose, carboxymethyl cellulose and the like. The blending 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 terms of water absorption, deodorant property and cost. Is more preferable. The blending 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 retention.

The third absorbent body in the sewage treatment system of the present invention is formed into a sheet by wrapping an absorbent composition in which pulp and a water-absorbent polymer are mixed in a predetermined mixing ratio with a sheet such as a nonwoven fabric. It was done.

The pulp used for the third absorber includes chemical pulp and mechanical pulp. The blending ratio of pulp in the absorbent composition is 70 to 90% by weight.
Is preferable, and more preferably 80 to 85% by weight.

The above water-absorbing polymer used in the third absorber includes starch-acrylic acid copolymer, cross-linked polyacrylic acid salt, vinyl ester-unsaturated carboxylic acid copolymer, isobutylene-maleic anhydride. Copolymer, starch-acrylonitrile copolymer crosslinked product, its hydrolyzate, crosslinked carboxymethyl derivative, crosslinked polyethylene oxide derivative, polyacrylamide partially hydrolyzed product,
Examples thereof include crosslinked polyvinyl alcohol. The content ratio of the water-absorbent polymer in the absorbent composition is preferably 10 to 30% by weight, and more preferably 15 to 20% by weight. These water-absorbent polymers can be used in any shape such as powdery, granular, granulated, scaly, lumpy, beaded, fibrous, etc., but they are easy to handle and can be sucked and distributed. From this point of view, it is preferable to use a powdery or granular material.

Nonwoven fabrics such as heat roll non-woven fabric and air-through non-woven fabric are used for the sheet used for the third absorber, and of these, the heat roll non-woven fabric is preferably used in terms of cost.

In the production of the third absorbent body, the above-mentioned pulp and water-absorbing polymer are mixed by an ordinary mixing method to produce the above-mentioned absorbent composition, and the above-mentioned absorbent composition is included in the above-mentioned sheet to form a sheet. It can be manufactured by molding.

The bed sand in the sewage treatment system of the present invention is preferably spherical or cylindrical from the viewpoint of allowing sewage to pass downward without accumulating. The spread sand has a diameter of 2 to 8 mm from the viewpoint that it does not spill from the liquid passage holes of the drape when laid on the sludge, and does not block the liquid passage holes of the drape to prevent the passage of waste liquid. It is preferable and it is more preferable that it is 4 to 6 mm. The sand is
The material is not particularly limited as long as it has the above-mentioned form and has corrosion resistance to the waste liquid to be treated,
From the viewpoint of deodorization, wood, okara, soybean, coconut, rapeseed, and the like squeezed oil dregs are preferably used.

In the sewage treatment system of the present invention, the tray is of a size capable of accommodating the sludge, the sewage treatment absorber and the bed sand without any trouble, and has strength and corrosion resistance. The material and form are not particularly limited, but from the viewpoint of ease of handling, moldability, etc., those made of synthetic resin such as polypropylene, polyethylene, polyethylene terephthalate, vinyl chloride, ABS are preferable.

In the waste liquid treatment system of the present invention, for example, when a pet urinates on the bed sand, the urine exuded from between the bed sand passes through the liquid passage hole without staying on the upper surface of the sludge. , Immediately absorbed by the sewage treatment absorber.

As described above, according to the sewage treatment system of this embodiment, sewage such as urine of a pet can be quickly absorbed,
Moreover, since the sewage does not stay on the upper surface of the spread sand, the bad odor can be reliably suppressed for a long period of time.

Next, the sewage treatment method of the present invention is a preferred embodiment of the sewage treatment system S of the above embodiment.
Will be described based on the embodiment using.

First, as shown in FIG. 1, a waste water treatment absorber 2 is laid under the drainboard 1. It is preferable that the waste water treatment absorber 2 and the drainboard 1 are arranged in the tray 3. Further, it is preferable to lay a predetermined amount of the sand 4 on the drainboard 1. Then, for example, a pet such as a cat or a dog is caused to urinate on the spread sand 4, and the urine (filtrate) that has passed through the liquid passage hole of the drainboard 1 is absorbed by the sewage treatment absorber 2.

In the wastewater treatment method of the present invention, when the sand is buried on the slats, the amount of the wastewater to be laid is 1 to ³ g / cm ³ in terms of efficiently introducing the wastewater into the absorber.
Is preferable, and more preferably 1.5 to 2.5 g / cm ³ .

The present invention is not limited to the above-mentioned embodiment, and can be appropriately modified without departing from the spirit of the present invention. For example, in the sewage treatment system of the present invention, as in the above-described embodiment, it is preferable to use the sludge of the present invention, but in the case of other saws, the lower surface of the sludge and the upper surface of the sewage treatment absorber are It goes without saying that other slates can be used as long as they can be in close contact.

[0064]

[Example 1] The following sludge was placed on the following wet-processed sewage treatment absorber to prepare a sewage treatment system, and a cleaning bottle was used to prepare the following composition at 30 ml / 10 seconds. Artificial urine was applied and the state of retention of the artificial urine in the sludge was visually observed. And it evaluated at the following stages. The results are shown in Table 1.
Shown in. <Drainboard> External shape: Rectangle (300 x 400 mm): Height of surrounding wall:
160 mm Longitudinal cross-sectional shape of boundary: trapezoid (upper bottom = 1.5 mm,
Lower bottom = 2.5 mm) Opening area at the upper end surface of the liquid passage hole: 4 mm × 4 mm Opening area at the lower end surface of the liquid passage hole: 3 mm × 3 mm Material: Polypropylene <Sewage treatment absorber> External dimensions: Rectangular (300 × 300mm), thickness (10m
m) Wood fiber molding: (compounding composition: ground pulp: corn starch: water = 100: 10: 70) Surfactant: amphoteric surfactant (“Amphitol 20N”)
0.2% by weight (made by Kao Corporation) (for wood fiber molding)

[Comparative Examples 1 and 2] A sewage treatment system was produced using a sludge having the same configuration as in Example 1 except that ribs 3 mm and 7 mm protruding downward were formed on the lower surface side. The retention state of artificial urine was examined in the same manner as in Example 1. The results are shown in Table 1.

[Evaluation of retention state] ◎: Almost no ○: Slightly less △: Neither can be said ●: Moderately high ×: Many

[0067]

[Table 1]

As shown in Table 1, in the case of the sewage treatment system (the product of the present invention) in which the lower surface of the boundary portion having no rib is a flat saw, and the upper surface of the sewage absorber is in close contact, Almost no artificial urine remained in the sample, no liquid film was formed in the liquid passage hole, and the urine was smoothly absorbed by the waste treatment absorber and did not give off a bad odor. In the sewage treatment system, it was confirmed that urine stagnates as droplets on the upper surface of the soot and as a film in the liquid passage holes, causing a bad odor.

[Examples 2 to 4 and Comparative Examples 3 to 6] The same sludge as in Example 1 and the same sewage as in Example 1 except that the longitudinal cross-sectional shape of the boundary portion is changed to the form shown in Table 2. A sewage treatment system was produced using the absorber, and the retention state of artificial urine in the sludge was examined by the same method as in Example 1. The results are shown in Table 2.

[0070]

[Table 2]

As shown in Table 2, in the case of the wastewater treatment system using the sludge whose width of the upper surface of the boundary in the longitudinal section of the boundary is 2 mm or less, almost no artificial urine remains on the upper surface of the sludge. In addition, no liquid film was formed in the liquid passage hole, and urine was smoothly absorbed by the sewage treatment absorber and did not give off a bad odor.
If it exceeds mm, urine stays in the form of droplets on the upper surface of the soup,
It was confirmed that there was a bad smell.

[Example 5] As in the case of Example 1, commercially available toilet sheets (trade name "Deosheet" manufactured by Unihearts) were used as the sludge and the waste liquid absorber, and the waste liquid absorber was placed on the sludge. Example 1
Artificial urine was applied in the same manner as in 1. and the state of retention of the artificial urine on the sludge was visually observed. As a result, it was confirmed that urine was hardly retained in the sludge and almost all of the applied urine was absorbed by the waste liquid absorber.

[0073]

According to the present invention, it is possible to eliminate the liquid remaining on the sludge such as urine of pets and to reliably suppress the malodor caused by the waste liquid.

[Brief description of drawings]

FIG. 1 is a schematic view showing an embodiment of a wastewater treatment system of the present invention, (a) is a cross-sectional view of the entire configuration, and (b) is an enlarged cross-sectional view of the configuration of a main part.

2A and 2B are schematic views showing one embodiment of the soot of the present invention, in which FIG. 2A is a plan view and FIG. 2B is a front sectional view.

FIG. 3 shows an example of an outer shape of a vertical cross section of a boundary portion of a sludge of the present invention, (a) is a rectangular cross section, and (b) is a cross section.
Is a trapezoidal cross section, (c) is an inverted trapezoidal cross section, and (d) is a circular cross section.

[Explanation of symbols]

1 Sunoko 1a Through hole 10, 11 boundary 2 Sewage treatment absorber 3 trays 4 bed sand S Sewage treatment system

Claims (3)

(57) [Claims] 1. A sewage treatment system comprising a soot and a plate-like or sheet-like sewage treatment absorber laid below the soot, wherein the sludge has a large number of liquid passage holes. a, and the lower surface the lower surface is in substantially flush of the boundary portions of the vent inlet hole
So that the recess of the injection mark of the molten resin injection pin remains on the side.
Sewage treatment system integrally formed of a synthetic resin for use, wherein the lower surface of the soot and the upper surface of the sewage treatment absorber are in close contact with each other. 2. The plate-like sewage treatment absorber comprises a liquid-absorbent base material mainly composed of plant fibers or pulp, and a surfactant or a surfactant and an antibacterial agent, and a binder, a cross-linking agent, or at least one kind of water. The sewage treatment system according to claim 1, which is obtained by molding a mixture obtained by mixing and. 3. A vertical cross section of the boundary portion is trapezoidal, triangular, or
The sewage treatment system according to claim 1 or 2 , wherein is a circle .