JPH08281668A - Large-scaled purifying tank - Google Patents

Abstract

PURPOSE: To solve various problems possessed by a purifying tank using conventional FRP by forming specific ribs having a specific uneven shape by utilizing a crosslinked polymer obtained by polymerizing and crosslinking metathesis polymerizable cyclic olefin in a mold using a metathesis polymerization catalyst. CONSTITUTION: At least, upper and lower tank parts have a large number of square uneven ribs in a vertical direction. The respective uneven ribs satisfy 10<=H<=50, 30<=W<=200, 2<=R<=H, 2<=R'<=H and 3<=t excepting a contact aeration tank part. The uneven ribs in the contact aeration tank part satisfy 10<=H'<=80, 30<=W'<=300, 2<=Q<=H', 2<=Q'<=H' and 3<=t'. Further, in a large- scaled purifying tank, the height H' of the uneven ribs of the contact aeration tank of at least the upper or low tank part is higher than the height H of the uneven ribs of other tank. By this constitution, the large-scaled purifying tank capable of being reduced in wt, strong against an impact, having durability and pressure resistance and capable of being recycled is obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a large-sized septic tank which is lightweight, strong against impact, and excellent in durability. The present invention also relates to a large-scale septic tank integrally molded, which does not require fiber reinforcement, can be recycled, and does not generate harmful gas during incineration and is non-polluting.

[0002]

2. Description of the Related Art Conventionally, most septic tanks are molded using fiber reinforced plastic (FRP). In particular, it is molded using an unsaturated polyester resin reinforced with glass fiber. When a septic tank is formed by using this unsaturated polyester resin reinforced with glass fibers, there is a problem that a large amount of dust containing glass fibers is generated and the working environment becomes poor. In addition, such a septic tank using FRP has a heavy weight, and has a drawback that cracks easily occur due to the impact when dropped during transportation or hit by pebbles during construction. Further, since the FRP molded product contains glass fiber, it is difficult to crush and crush it at the time of disposal, and even if it is incinerated, a large amount of glass fiber remains and it takes time and labor to process it.

[0003]

SUMMARY OF THE INVENTION Therefore, a first object of the present invention is to provide a large-sized septic tank which solves various problems of the conventional septic tank using FRP. A second object of the present invention is to avoid environmental problems in the manufacturing process,
Moreover, it is an object of the present invention to provide a large-sized septic tank which can be molded relatively easily by the reaction injection molding method. A third object of the present invention is to provide a large-sized septic tank which is lightweight, has sufficient strength against impact, and can sufficiently withstand internal and external pressures after installation. Another object of the present invention is to provide a septic tank in which the used resin molded product can be recycled and can be easily disposed of. Still another object of the present invention is to provide a septic tank that can be advantageously used as a large-scale septic tank, especially as a combined septic tank.

[0004]

Means for Solving the Problems As a result of intensive studies to solve the above-mentioned object of the present invention, the present inventors have found that a metathesis polymerization catalyst system (metathesis catalyst system) is used to produce a metathesis polymerization catalytic cyclic olefin. By using the crosslinked polymer obtained by polymerizing and crosslinking reaction in the mold, by forming ribs with a specific uneven shape, it is easy to manufacture, it is possible to reduce the weight, it is strong against impact, and durable. Further, the inventors have found that a large-scale recyclable septic tank having pressure resistance can be obtained, and the present invention has been achieved.

That is, according to the present invention, it is a large-scale septic tank comprising an upper tank portion and a lower tank portion, or an upper tank portion, a lower tank portion and an intermediate tank portion of a plate-like belt connecting them. In the large-scale septic tank, (1) at least the upper tank portion and the lower tank portion are composed of a monomer liquid A (solution A) composed of a metathesis polymerizable cyclic olefin containing a catalyst component of the metathesis polymerization catalyst system and a metathesis polymerization catalyst system. Obtained by mixing a monomer liquid B (solution B) containing a metathesis-polymerizable cyclic olefin containing an activator component, injecting the raw material mixed liquid into a mold, and causing polymerization and crosslinking reaction in the mold. (2) at least the upper tank part and the lower tank part have a large number of rectangular ribs in the longitudinal direction, and (3) except for the contact aeration tank part, respectively. Uneven ribs following shape (i) ~ (i
v), the uneven ribs in the contact aeration tank portion satisfy the following shapes (v) to (viii), and further, at least the height of the uneven ribs in the contact aeration tank of the upper tank portion or the lower tank portion. There is provided a large-sized septic tank characterized in that (H ′) is higher than the height (H) of the uneven ribs in the other tank. (I) 10 ≦ H ≦ 50 (ii) 30 ≦ W ≦ 200 (iii) 2 ≦ R ≦ H, 2 ≦ R ′ ≦ H (iv) 3 ≦ t (v) 10 ≦ H ′ ≦ 80 (vi) 30 ≦ W ′ ≦ 300 (vii) 2 ≦ Q ≦ H ′, 2 ≦ Q ′ ≦ H ′ (viii) 3 ≦ t ′ [wherein, H and H ′ respectively indicate the height (depth) of the uneven ribs, W and W'represent the width of the uneven ribs, t and t'represent the average thickness of the molded product in a cross section at right angles to the length direction of the uneven ribs, R, R ', Q and Q'respectively The radius of the bent portion of the uneven portion is shown.
All units of t, t ', H, H', W, W ', R, R', Q and Q'are expressed in millimeters (mm). ]

According to the present invention, the tank volume is 2 m ³ or more, preferably ³ to 15 m ³ , and particularly preferably 3 to 12
A large m ³ septic tank is provided.

The present invention will be described in more detail below. As the metathesis-polymerizable cyclic off-line for forming the cross-linked polymer which constitutes the septic tank of the present invention, those containing 1-2 metathesis-polymerizable cycloalkene groups in the molecule are used. A compound having at least one norbornene skeleton in the molecule is preferable. Specific examples thereof include dicyclopentadiene, tricyclopentadiene, cyclopentadiene-methylcyclopentadiene co-dimer, 5-ethylidene norbornene, norbornene, norbornadiene, 5-cyclohexenyl norbornene, 1,4,5,8-dimethano -1,4,4a, 5,6,
7,8,8a-octahydronaphthalene, 1,4-methano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene, 6-ethylidene-1,4,5,8-dimethano- 1,
4,4a, 5,6,7,8,8a-octahydronaphthalene,
6-ethylidene-1,4-methano-1,4,4a, 5,6,
7,8,8a-octahydronaphthalene, 1,4,5,8-
Dimethano-1,4,4a, 5,8,8a-hexahydronaphthalene, ethylene bis (5-norbornene) and the like can be mentioned, and a mixture thereof can also be used. Especially cidiclopentadiene or 50 mol% thereof
A mixture containing at least 70 mol% is preferably used.

If necessary, a metathesis-polymerizable cyclic olefin having a polar group containing a different element such as oxygen and nitrogen can be used as a copolymerization monomer. Such a copolymerizable monomer also preferably has a norbornene structural unit, and the polar group is an ester group,
Ether groups, cyano groups, N-substituted imide groups, halogen groups and the like are preferable. Specific examples of the copolymerization monomer include 5-methoxycarbonylnorbornene and 5- (2-
Ethylhexyloxy) carbonyl-5-methylnorbornene, 5-phenyloxymethylnorbornene, 5-cyanonorbornene, 6-cyano-1,4,5,8-dimethano-1,4,4a, 5,6,7,8 Examples include 8,8a-octahydronaphthalene, N-butyl nadecic acid imide, and 5-chloronerbornene.

The monomer solution A (solution A) in the present invention contains a catalyst component of a metathesis polymerization catalyst system. As such a catalyst component, a metal halide such as tungsten, rhenium, tantalum or molybdenum is used, and a tungsten compound is particularly preferable. As such a tungsten compound, tungsten hexahalide, tungsten oxyhalide and the like are preferable, and more specifically, tungsten hexachloride, tungsten oxychloride and the like are preferable. Further, organic ammonium tungstate or the like can also be used. It has been found that when such a tungsten compound is directly added to the monomer, it immediately starts cationic polymerization, which is not preferable. Therefore, such a tungsten compound is preferably suspended in an inert solvent such as benzene, toluene, chlorobenzene and the like in advance and solubilized by adding a small amount of an alcohol compound and / or a phenol compound to be used. Further, as described above, it is preferable to add about 1 to 5 mol of Lewis base or chelating agent to 1 mol of the tungsten compound in order to prevent undesired polymerization. Examples of such additives include acetylacetone, acetoacetic acid alkyl esters, tetrahydrofuran, and benzonitrile. When a polar monomer is used, it may be a Lewis base itself as described above, and it may have its action even if the above compound is not added. As described above, the monomer liquid A (solution A) containing the catalyst component has substantially sufficient stability.

On the other hand, the monomer solution B (solution B) in the present invention contains an activator component of the metathesis polymerization catalyst system. The activator component is preferably an organometallic compound centered on a metal alkylated compound of Groups I to III of the Periodic Table, particularly tetraalkyltin, an alkylaluminum compound, and an alkylaluminum halide compound,
Specific examples thereof include diethyl aluminum chloride, diethyl aluminum chloride, trioctyl aluminum, dioctyl aluminum iodide, and tetrabutyl tin. By dissolving the organometallic compound as the activator component in the monomer, the monomer liquid B
(Solution B) is formed.

Basically, the solution A and the solution B are mixed and injected into a mold to obtain a molded article of the desired crosslinked polymer. Is initiated very quickly, so that curing can occur before it has flowed sufficiently into the mold, which is often a problem. Therefore, it is preferable to use an activity regulator. As such a regulator, Lewis bases are generally used, among others, ethers, esters,
Nitriles and the like are used. Specific examples include ethyl benzoate, butyl ether, diglyme and the like. Such a regulator is generally used by adding it to the solution (solution B) side of the component of the activator of the organometallic compound. When a monomer having a Lewis base is used as described above, it can also serve as a regulator.

The amount of the metathesis polymerization catalyst system used is, for example, when a tungsten compound is used as the catalyst component, the ratio of the tungsten compound to the raw material monomer is
It is about 1.000: 1 to 15,000: 1, preferably about 2,000: 1 on a molar basis, and when an alkylaluminum is used as the activator component, an aluminum compound for the above raw material monomer is used. The ratio of about 100 to 1 to 10,000 to 1, preferably 20.
Around 0 to 1 to 1000 to 1 is used. Further, as described above, the chelating agent and the regulator can be appropriately adjusted and used depending on the amount of the catalyst system used by experiments.

The molded article of the present invention can basically be obtained by injecting the above-mentioned solution A and solution B into a mixed mold. At that time, the catalytic activity of the metathesis catalyst system formed by mixing the solution A and the solution B can be expressed by the time from when the two solutions are mixed to when the mixed solution loses fluidity. That is, if the time until the fluidity is lost is defined as the time from when both solutions are placed in a glass container equipped with a stirrer and the stirring is started until the solution gels and entangles with the stirring shaft of the stirrer. It is desirable that the solution A and the solution B of the present invention lose their fluidity at 30 ° C. for 1 to 120 seconds, preferably 2 to 100 seconds.

The molded article of the crosslinked polymer obtained by the present invention may further contain various additives depending on the purpose in order to improve or maintain the characteristics in practical use. Such additives include fillers, pigments, antioxidants, light stabilizers, flame retardants, polymer modifiers and the like. Such additives cannot be added after the crosslinked polymer of the present invention has been molded, and therefore, when added, it is necessary to add them to the above-mentioned raw material solution in advance.

The simplest method is the solution A described above.
And a solution B may be added in advance to either or both of them, but in that case, they do not react to a certain extent with the catalyst component and activator component having strong reactivity in the liquid and do not react to some extent. , And it should not interfere with the polymerization. If the reaction does not substantially hinder the polymerization even when the reaction is unavoidable, it is possible to prepare a third liquid by mixing with the monomer and mix and use it immediately before the polymerization. Further, the polymerization catalyst or activator is used as the third liquid, and solution A or solution B containing no third catalyst
A method of adding the above-mentioned additive to is also conceivable. Further, in the case of a solid filler, when the two components are mixed and the shape is such that the voids can be sufficiently filled immediately before starting the polymerization reaction or during the polymerization, it is filled in the molding die. It is also possible to keep it. Reinforcing agents or fillers as additives are effective in improving the bending modulus. Examples of such a material include glass fiber, mica, carbon black, wollastonite and the like. Those obtained by surface-treating these with a so-called silane coupler can be preferably used.

Further, it is preferable to add an antioxidant to the molded article according to the present invention. Therefore, it is desirable to add a phenol type or amine type antioxidant to the solution in advance. Specific examples of these antioxidants include 2,6-di-t-butyl-p-cresol and N, N '.
-Diphenyl-p-diphenylenediamine, tetrakis [methylene (3,5-di-t-butyl-4-hydryloxycinnamate)] methane and the like.

Further, the molded article of the present invention can be obtained by adding another polymer in a monomer solution state at the time of molding. As such a polymer additive, the addition of an elastomer is effective in enhancing the impact resistance of the molded product and controlling the viscosity of the solution. Elastomers used for such purposes include styrene-butadiene-styrene triblock rubber, styrene-isoprene-styrene triblock rubber, polybutadiene, polyisoprene, butyl rubber, ethylene propylene-diene terpolymer,
There is a wide range of elastomatos such as nitrile rubber.

Examples of the material of the mold for forming the large-scale septic tank of the present invention include steel, cast or forged aluminum, cast aluminum, casting and spraying of zinc alloy, electroforming of nickel and copper, and resin. Can be mentioned. Also, the mold structure is such that the pressure generated in the mold during molding is several k.
Since the g / cm ² is low compared to other molding methods, a simple one is sufficient, and thus it can be manufactured at a lower cost than a mold of other molding methods.

One of the features of the cyclic off-line cross-linked polymer molded article of the present invention is that it is excellent in impact resistance and will not be easily broken even if dropped or hit by solid matter such as pebbles. . Further, the molded article of the present invention basically does not need to use a reinforcing material such as glass fiber. Therefore, the flexural modulus is generally lower than those using these reinforcing materials. As a means for solving this, it has a shape having a rib having a specific structure.

Once the septic tank is installed, it will be used for a long period of 10 to 20 years or more. Moreover, since water enters the inside of the septic tank, water pressure is applied to the inside, and when it is buried underground, it will come from outside due to earth and sand or ground water. Even if pressure is constantly applied, rigorous durability and pressure resistance are required. In order to meet such required characteristics, the large-sized septic tank of the present invention has a certain number of ribs having a specific unevenness, so that there is no problem in pressure resistance and durability in the short term and the long term.

Next, the structure of the large-scale septic tank of the present invention will be described with reference to the drawings. The large-scale septic tank of the present invention is basically composed of two or three members. That is, it is composed of two members, an upper tank part and a lower tank part, or is composed of three members, an upper tank part, a lower tank part, and a plate-shaped intermediate tank part connecting them.

FIG. 1 shows an example of a large-scale septic tank according to the present invention. A is a front view thereof and B is a side view thereof. In FIG. 1, 1 is an upper tank part and 2 is a lower tank part.
In FIG. 1, the upper tank portion 1 and the lower tank portion 2 are fixed by flanges 3 and 3 '. Further, the upper tank portion 1 and the lower tank portion 2 may be fixed to each other by a plate-shaped intermediate tank portion connecting them. This intermediate tank part is not shown in FIG.
The intermediate tank portion is usually fixed firmly between the upper tank portion and the lower tank portion via a flange. By providing this intermediate tank part,
A septic tank having an increased inner volume can be obtained.

In the large-scale septic tank of the present invention, at least the upper tank portion and the lower tank portion are molded products of the crosslinked polymer of the above-mentioned metathesis-polymerizable cyclic olefin, preferably the upper tank portion,
All of the lower tank portion and the intermediate tank portion are molded products of this crosslinked polymer. Each of the upper tank portion, the lower tank portion, and the intermediate tank portion is also characterized in that they are integrally molded products.

Since the molded article of the present invention does not contain a reinforcing material such as glass fiber, the material itself has a low rigidity, but the rigidity is improved as a structure based on the shape of the ribs of the unevenness. As described above, the uneven rib is provided in the vertical direction of the septic tank as a structure that can withstand the internal pressure and the external pressure. In the large-scale septic tank of FIG. 1, ribs 4 and 4'are vertically provided in the upper tank portion and the lower tank portion (the number of concave and convex ribs is 5 in the front view and 2 in the side view in FIG. 1). Is).

The large septic tank of the present invention is provided with a vertical rib (hereinafter referred to as "vertical rib") provided in the upper tank portion or the lower tank portion.
It may be abbreviated as "). The height of the concave-convex rib is different from that of the contact aeration tank portion and the other tank portions. That is, at least in the contact aeration tank portion in the upper tank portion or the lower tank portion, the vertical rib is characterized in that the height of the rib is higher than that of the vertical ribs existing in other than the contact aeration tank portion. The vertical ribs of the contact aeration tank of both the upper tank portion and the lower tank portion, the height of the rib is higher than that of the vertical ribs other than the contact aeration tank portion,
Most preferably in the present invention, it is also included in the present invention that the vertical rib of the contact aeration tank in either the upper tank portion or the lower tank portion is higher than the vertical ribs in the other tank portions. For the purpose of the present invention of strengthening the contact aeration tank, the height of the vertical rib of the upper tank portion or the lower tank portion which is not high is equal to the height of the vertical ribs other than the contact aeration tank.

That is, the vertical ribs provided in the large-sized septic tank of the present invention satisfy the following shapes (i) to (iv) except for the contact aeration tank portion, and the uneven ribs of the contact aeration tank portion have the following shape. It satisfies (v) to (viii). (I) 10 ≦ H ≦ 50 (ii) 30 ≦ W ≦ 200 (iii) 2 ≦ R ≦ H, 2 ≦ R ′ ≦ H (iv) 3 ≦ t (v) 10 ≦ H ′ ≦ 80 (vi) 30 ≤W '≤ 300 (vii) 2 ≤ Q ≤ H', 2 ≤ Q '≤ H' (viii) 3 ≤ t'where H, H ', W, W', R, R ', Q, Q' , T and t ′ have the meanings given above respectively,
Basically, it will be explained based on. FIG. 2 is a sectional view showing an example of the uneven rib.

In FIG. 2, the height of the rib is H, the width of the rib is W, the average thickness of the molded product in a cross section perpendicular to the length direction of the rib is t, the radius at the bent portion of the uneven portion is R and R '
However, these have the same meaning as the shape (cross section) of the vertical ribs in the contact aeration tank portion and the other tank portions. In the above formulas (i) to (viii), in the formulas (v) and (viii), H ′, W ′ and t ′ are the same as those shown as H, W and t in FIG. 2, respectively. It should be understood to have meaning. Further, Q and Q ′ have the same meanings as R and R ′ in FIG.

The standards for treatment by septic tanks are becoming stricter year by year, and it is required to clean the treated water discharged from the septic tanks. The contact aeration tank is a place to be treated with activated sludge, and in order to improve the treatment there, it is necessary to lengthen the flow path or enlarge the entire contact aeration tank to lengthen the contact time. Therefore, the contact aeration tank becomes large and long, and the interval between the partition plates forming the contact aeration tank increases. When the distance between the partition plates increases, the deformation increases when the internal pressure or the external pressure is applied as it is. In order to suppress the deformation, it is better to increase the wall thickness of the tank, but the weight becomes heavier. Alternatively, it is possible to increase the number of uneven ribs, but increasing the number of ribs between fixed fulcrums is a limit in terms of the effect on rigidity. Also, increasing the number of ribs makes molding more difficult.

This contacting aeration tank portion is a place to be brought into contact with activated sludge, and even if the shape of the wall portion of the tank is slightly uneven, it has little influence on the treatment itself and the flow of water.
Therefore, it was found that increasing the height of the uneven ribs in the contact aeration tank can sufficiently cope with a larger contact aeration tank. By increasing the height of the uneven ribs, considering the draft angle, the molding is almost the same as the conventional one in terms of weight and the deformation can be suppressed.

On the other hand, widening the width of the uneven rib also has the effect of suppressing deformation in the same manner without changing the molding or weight. However, with respect to the height and width of the uneven ribs, the effect of suppressing the deformation is larger when the height is changed, and it is more preferable that the height of the uneven ribs is changed.

In FIG. 2, the height of the convex portion (or concave portion) of the concave-convex rib is represented by H. This height H is in the range of 10 to 50 mm, preferably 1 excluding the contact aeration tank.
It is in the range of 5 to 40 mm. When the height H is less than 10 mm, the rigidity of the structure is less improved, while 50 m
If it exceeds m, the depth of the uneven ribs is too large, which makes the handling during transportation and construction troublesome and further complicates the internal structure of the septic tank. In the contact aeration tank, since the internal structure of the septic tank is not as strict as that of the anaerobic filter bed tank and the partition plate interval is long, the height (H ') is 10 to maintain rigidity.
It is in the range of 80 mm, preferably in the range of 15 to 60 mm, and (H ') is higher than the height (H) other than in the contact aeration tank at least in either the upper tank part or the lower tank part. It is necessary.

The width W of the uneven rib excluding the contact aeration tank is 30
˜200 mm, preferably 50 to 180 mm. Narrower than 30 mm and wider than 200 mm is not desirable due to the strong rigidity of the structure. The width (W ') of the uneven rib in the contact aeration tank is 3
It is preferably 50 to 220 mm in the range of 0 to 300 mm. In the contact aeration tank part, the rib width (W ') is long because the partition plate interval is long. Therefore, the rib width (W) of other tanks may be widened to balance rigidity. Are generally preferred.

The radii R, R ', Q and Q'of the bent portions of the uneven ribs are 2 mm to Hmm (or H'm independently).
The range is m). When the bending radius is 2 mm or less, the concave and convex ribs are bent almost at right angles, and the possibility that the bent portion is bent increases. On the other hand, the value is the height Hm
If it is larger than m (or H'mm), it becomes too gentle, and the efficiency of the rigidity up becomes small. R, R ′, Q and Q ′ may be different from each other, but generally the same value is used. In the present invention, the number of the plurality of rectangular concave-convex ribs at least in the vertical direction of the upper tank portion and the lower tank portion is 0.7 to 6 per 1 m on average with respect to the lateral length of the septic tank, preferably It has 1.5 to 5 pieces per 1 m. However, at least one contact aeration tank and at least one contact aeration tank are provided in addition to the contact aeration tank.

The thickness (t and t ') of the septic tank of the present invention is 3 mm or more, preferably 4 mm or more, and more preferably 4.5 mm or more in terms of strength, similar to the thickness of the uneven ribs.
On the other hand, the thicker the structure, the greater the strength and rigidity of the structure, but the heavier and more expensive it becomes. Therefore, the thickness (t and t ') of the septic tank (uneven rib) of the present invention is 15 mm or less, preferably 10 mm or less.

In the large-scale septic tank of the present invention, ordinary rod-shaped ribs or plate-shaped ribs may be provided in addition to the uneven ribs of the present invention. Further, a partition plate for partitioning is required inside the septic tank in terms of the function of the septic tank, but the partition plate is important as a septic tank structure for preventing deformation against internal pressure and external pressure, and the partition plate has high rigidity. By using a material or a structure, it is possible to prevent the entire septic tank from being deformed. In the present invention, the uneven ribs are installed in the vertical direction of the septic tank. However, when the septic tank is buried underground, the pressure for pushing up groundwater at the bottom of the septic tank is generally large. Therefore, it is possible to increase the rigidity of the bottom portion by extending a part of the uneven ribs provided in the vertical direction to the bottom portion of the septic tank as it is.

The septic tank of the present invention is generally divided into two parts, an upper tank part and a lower tank part, and if necessary an intermediate tank part is formed separately. The molding method is already known,
For example, it is molded by the method disclosed in Japanese Examined Patent Publication No. 3-28451. A flange portion serving as a joint is provided at the openings of the upper tank portion and the lower tank portion, and by combining with the flange, the upper tank portion and the lower tank portion are combined to form a septic tank. In the present invention, the height and volume of the septic tank can be increased by inserting and sandwiching the strip-shaped intermediate tank portion having upper and lower flanges between the flanges of the upper tank portion and the lower tank portion. The flange has a septic tank structure,
The rib structure is provided in the lateral direction, and its thickness is also important. The thickness of the entire flange is 1.5 to the average thickness of the septic tank.
A thickness of 5 times is preferably used.

The inside of the septic tank of the present invention is the same as the inside of a normal septic tank, which is not shown in the figure, and is divided by function such as an anaerobic tank, an aerobic tank (contact aeration tank), and a disinfection tank.
Each section is filled with various members for efficiently purifying wastewater, and a running water channel is provided. The septic tank of the present invention can be used as a single tank for only treating human waste or as a combined septic tank for purifying both human waste and domestic wastewater. In particular, the septic tank of the present invention is suitable for upsizing, especially for those having an internal volume of 2 m ³ or more, and can be particularly suitably used for the purpose of a combined septic tank, which is in great demand in the future in view of environmental measures.

[0038]

EXAMPLES The present invention will be described below with reference to examples. still,
The examples are illustrative and the invention is not limited thereto.

Example 1 [Mold] An aluminum mold incorporating the product shape shown in FIG. 1 was used. The dimensions of the septic tank made in the examples were as follows. A = 390 mm, B = 520 mm, C = 490 mm, D
= 220 mm E = 320 mm, F = 520 mm, L = 2460 mm I = 260 mm, J = 1140 mm, G = 950 mm,
K = 800 mm All of the uneven ribs except for the contact aeration tank portion (side surface portion) had the following shape and size in FIG. (I) H = 30 mm (ii) W = 160 mm (iii) R = 25 mm, R ′ = 25 mm (iv) t = 4.3 mm All the uneven ribs of the contact aeration tank portion (side surface portion) are shown in FIG. Had the following shape and size. (V) H '= 55 mm (vi) W' = 200 mm (vii) R = 25 mm, R '= 25 mm (viii) t' = 4.3 mm

[Monomer solution] (Preparation of solution A) 28 parts by weight of tungsten hexachloride were added to 80 parts by weight of dry toluene under a nitrogen stream, and then t
-Add a solution of 1.3 parts by weight of butanol in 1 part by weight of toluene and stir for 1 hour, then add nonylphenol 1
A solution of 8 parts by weight and 14 parts by weight of toluene was added, and the mixture was stirred for 5 hours under a nitrogen purge. Further, 14 parts by weight of acetylacetone was added. While the hydrogen chloride gas produced as a by-product was driven out, stirring was continued overnight under a nitrogen purge to prepare a polymerization catalyst solution.

Next, ethylene was added to a monomer mixture consisting of 95 parts by weight of purified dicyclopentadiene (purity 99.7% by weight, hereinafter the same) and 5 parts by weight of purified ethylidene norbornene (purity 99.5% by weight, hereinafter the same). 70
To the solution prepared by adding 3 parts by weight of ethylene-propylene-ethylidene norbornene copolymer rubber (mol%) and 2 parts by weight of Etanox 702 as an oxidation stabilizer, the above polymerization catalyst solution was added so that the tungsten content was 0.01 M / L. To prepare a monomer liquid A (solution A) containing a catalyst component.

(Preparation of Solution B) 70 mol% of ethylene content based on a monomer mixture consisting of 95 parts by weight of purified dicyclopentadiene and 5 parts by weight of purified ethylidene norbornene.
3 parts by weight of ethylene-propylene-ethylidene norbornene copolymer rubber was dissolved in a solution of trioctyl aluminum 85 and dioctyl aluminum iodide 1
5. Add the activator mixture for polymerization prepared by mixing 100 parts of diglyme at a ratio of aluminum content 0.03 M / L to prepare a monomer liquid B (solution B) containing an activator component. did.

[Molding] The aluminum mold for molding was heated to 90 ° C. for the cavity mold and 60 ° C. for the core mold and the mold was closed. Then, an equal amount of the solution was mixed in the molding head using a RIM molding machine. A and solution B were collision-mixed and injected. Two minutes after the liquid injection and filling, the mold was opened and after 3.5 minutes, the crosslinked polymer product was taken out.

[Evaluation as a septic tank] The upper and lower tanks of the obtained crosslinked polymer molded article were fixed with bolts and an adhesive through the flange portion to obtain a product for evaluation. The product is FR
Three P partition plates are used and fixed with the same bolt and adhesive. In the rigidity test based on JIS A4101, items 5 and 8, the product had a maximum deformation amount of 10 mm in the lower central portion of the contact aeration tank when water was poured into the septic tank up to 300 mm.

Comparative Example 1 A septic tank having the same size and shape as in Example 1 except that H ′ = 25 mm in Example 1 was formed. When the same rigidity test as in Example 1 was performed,
The maximum amount of deformation was 26 mm at the lower center of the contact aeration tank.

Example 2 A septic tank was molded with the same size and shape as in Example 1 except that H '= 65 mm.
As a result of the rigidity test, the maximum deformation amount was 4 mm in the lower central portion of the contact aeration tank.

[Brief description of drawings]

1 shows an example of a large-scale septic tank according to the present invention, where A is a front view and B is a side view.

FIG. 2 shows a cross-sectional view of the uneven ribs in the large-sized septic tank according to the present invention.

FIG. 3 shows a plan view of an example of a large-sized septic tank according to the present invention as seen from the bottom thereof.

[Explanation of symbols]

 1 septic tank upper tank part 2 septic tank lower tank part 3 flange 3'flange 4 uneven rib 4'uneven rib I first anaerobic tank II second anaerobic tank III contact aeration tank IV precipitation tank

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Claims (1)

[Claims] 1. A large-sized septic tank comprising an upper tank part and a lower tank part, or an upper tank part, a lower tank part and an intermediate tank part of a plate-shaped belt connecting them. (1) At least the upper tank part and the lower tank part contain a monomer liquid A (solution A) composed of a metathesis-polymerizable cyclic olefin containing a catalyst component of a metathesis polymerization catalyst system and an activator component of the metathesis polymerization catalyst system. Monomer liquid B containing the metathesis-polymerizable cyclic olefin contained therein (solution B)
A crosslinked polymer molded article obtained by mixing and mixing the raw material mixed solution into a mold, and causing polymerization and crosslinking reaction in the mold, wherein (2) at least an upper tank part and a lower tank Section has a large number of rectangular ribs in the vertical direction, and (3) except for the contact aeration tank portion, each of the ribs satisfies the following shapes (i) to (iv), and the contact aeration tank portion The concave-convex ribs in are in the following shapes (v) to (vii
i), and at least the height (H ′) of the uneven ribs in the contact aeration tank of the upper tank section or the lower tank section is
A large septic tank characterized by being higher than the height (H) of the uneven ribs in other tanks. (I) 10 ≦ H ≦ 50 (ii) 30 ≦ W ≦ 200 (iii) 2 ≦ R ≦ H, 2 ≦ R ′ ≦ H (iv) 3 ≦ t (v) 10 ≦ H ′ ≦ 80 (vi) 30 ≦ W ′ ≦ 300 (vii) 2 ≦ Q ≦ H ′, 2 ≦ Q ′ ≦ H ′ (viii) 3 ≦ t ′ [wherein, H and H ′ respectively indicate the height (depth) of the uneven ribs, W and W'represent the width of the uneven ribs, t and t'represent the average thickness of the molded product in a cross section at right angles to the length direction of the uneven ribs, R, R ', Q and Q'respectively The radius of the bent portion of the uneven portion is shown.
All units of t, t ', H, H', W, W ', R, R', Q and Q'are expressed in millimeters (mm). ]