JPH06238253A - Refuse disposal method - Google Patents

Abstract

PURPOSE:To obtain a refuse disposal method contributing to the protection of environment by accumulating refuse on a refuse disposal site having a waterproof sheet laid on the bottom surface thereof to cover the same with a capping sheet and leveling rainwater to allow the same to flow in refuse and sending the rainwater to a sewage treatment plant from a drain port. CONSTITUTION:In a refuse disposal method, refuse 9 is accumulated on a refuse disposal site 1 having the drain port 3 connected to a sewage treatment plant provided to the bottom surface thereof and having drain troughs 5, 6, 7 provided to the planar parts of the tiered side surface thereof and having a waterproof sheet laid on the bottom and side surfaces thereof and covered with a capping sheet 10 formed by integrating a film like material composed of a photodegradable polymer with a fabric, a nonwoven fabric, a knitted fabric, a reticulated material or a perforated film like material composed of a material other than plyolefin and rainwater is leveled to be allowed to flow in the fefuse and sent to the sewage treatment plant from the drain port 3. As a result, the capping sheet 10 prevents rainwater from penetrating into refuse at the initial stage of covering and the penetration of rainwater is leveled with the elapse of time to be uniformly generated throughout the refuse.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating waste disposed of in a waste treatment plant.

[0002]

2. Description of the Related Art In recent years, the Japanese economy has continued to develop, and along with it, the population is concentrated in cities, and production activities and consumption activities have become active. In proportion to this, waste paper, wood waste, fiber waste, glass waste, etc. , Ceramic waste, rubber waste, metal waste,
Construction waste materials, waste plastics, slag, sludge, vegetables and fruits from homes and restaurants, cooking residues of cereals, meat, seafood, oils and fats, leftover foods, animal and plant wastes from food manufacturing plants A large amount of garbage is generated, which is a problem. These wastes may be incinerated in an incineration facility or separated for resource recovery, but the former must install an incineration facility, and there is opposition from nearby residents due to the generation of odors and smoke. Yes The number of facilities is limited, and the latter only collects relatively expensive materials such as plastic, metal, paper, etc., and other low value materials cannot recover the recovery cost, so there is no other way than to dispose of them, especially Food residues and food wastes are often disposed of as they are in the landfills, and the problems of offensive odors and scattering, and the problems of dogs, cats and birds hunting and eating foods in the garbage are serious. As mentioned above, the amount of waste increases year by year, and since the waste is bulky, it is partially burned in the incinerator before it is brought into the waste treatment plant to reduce the capacity, and early stabilization of the waste treatment plant is measured to landfill. The land is being used effectively. However, 10% or more of vinyl chloride resin and vinylidene chloride resin are mixed in the waste,
Since hydrogen chloride is generated when these are burned, slaked lime, quick lime, caustic soda, dolomite, etc. are added for neutralization. In many cases, neutralized products such as calcium chloride, sodium chloride, magnesium chloride, etc. are simply discarded as calcinated products together with the waste at the landfill. These calcined products easily dissolve in rainwater and flow into the sewage treatment plant connected to the waste treatment plant, but the inflow amount often exceeds the treatment capacity of the sewage treatment plant and overflows into rivers and fields. Untreated, it may cause damage to crops and seafood, and in some cases, damage factories and water treatment plants that use downstream river water. In addition, garbage is generated from vegetables, fruits, cereals, meat, seafood, cooking residues of oils and fats from homes and restaurants, foods left uneaten, animal and plant wastes from food manufacturing plants, etc. There are a large amount of water-soluble substances, which are also brought to the sewage treatment plant in large quantities by rainwater, and the above-mentioned calcium chloride, sodium chloride,
It causes the same damage as magnesium chloride.

[0003]

In consideration of such a situation, the present invention is designed so that the runoff of water-soluble substances contained in the waste due to rainwater falls within the treatment capacity of the wastewater treatment plant. A waste treatment method that gradually dissolves water-soluble substances from the waste and prevents foul odors and scattering of the waste and contributes to environmental protection such as preventing dogs, cats, and birds from hunting food in the waste. Is an issue.

[0004]

[Means for Solving the Problems] As a result of earnest studies, the present inventors have made it possible to discharge the rainfall to the waste treatment plant to the outside of the system of the waste treatment plant without contacting the waste as much as possible, and then to the rainfall on the waste. Found a method of gradually passing through the waste to prevent a large amount of treated substances from being brought to the sewage treatment plant at one time, and filed a patent application therefor (Japanese Patent Application No. 3-265223). The gist of the patent application is, as shown in claim 1, that "a drainage port is connected to a sewage treatment plant on the bottom surface, a side surface is stepped, and a drainage groove is formed on the flat surface. Collects waste at a landfill where a waterproof sheet is laid, and coats a capping sheet with a photo-degradable polymer on a woven fabric, non-woven fabric, knitted fabric or mesh made of polyolefin on top of it. It is a waste treatment method characterized by leveling and inflowing it into the waste and sending it to the sewage treatment plant from the drainage. ”After that, when materials other than polyolefin were tested in the above, good results were obtained. The present invention was completed by finding a material and demonstrating that the problem of the present invention can be solved.

That is, the waste treatment method of the present invention has a drainage port connected to a sewage treatment plant on the bottom surface, a side surface is stepwise and has a drainage groove on its flat surface, and the bottom surface and the side surface are waterproof. Is deposited on a waste treatment plant where a flexible sheet is laid, and a woven fabric made of a material other than polyolefin, a non-woven fabric, a knitted fabric, a perforated membrane or a film made of a photodegradable polymer is formed on the perforated membrane. It is characterized by covering with a capping sheet that integrates the items, leveling rainwater, flowing it into the waste, and sending it to the wastewater treatment plant from the drainage port. In the present specification, "leveling rainwater to flow into the waste" means that the capping sheet coated on the surface of the waste layer is initially waterproof and does not allow rainwater to flow into the waste layer, but the passage of time. At the same time, the photo-disintegrating polymer film of the sheet collapses, and many fine holes are formed on the surface of the sheet, so rainwater penetrates uniformly into the dust layer and dissolves a certain amount of the water-soluble substance in the dust layer. Means to let. Rainwater leveled and passed through the waste is sent to the sewage treatment plant through the drainage port on the bottom of the sewage treatment plant, where it is purified and discharged, but the amount to be treated is constant, so the treatment capacity of the sewage treatment plant must be exceeded. There is no.

In the waste treatment method of the present invention, the operation of depositing dust and coating the capping sheet on the dust is repeated a plurality of times, and the drain groove located at a position higher than the capping sheet is provided at a position higher than the drain groove. It is preferable to let the rainfall flow into a side surface and discharge it outside the system of the waste treatment plant.

Further, the periphery of the capping sheet is fixed to a drain on the side of the waste treatment plant so that rainwater can flow into the drain so that the rainwater does not flow into the drain on the bottom of the waste treatment plant. It is desirable to do so.

In the present invention, the waste treatment plant has a drainage port connected to the sewage treatment plant on the bottom surface, a side surface is stepped and has a drainage groove on its flat surface, and the bottom surface and the side surface are waterproof. The property sheet is laid, and it is a flat land where waste is discarded, a depression in a mountain valley, a gravel collection site, a soil collection site, a coastal landfill site, etc. The waterproof sheet is for preventing contaminated water from dust from penetrating into the ground. In addition, the rainwater that has passed through the waste is sent together with the water-soluble components in the waste from a drain port provided on the bottom surface to a sewage treatment plant via an appropriate drainage channel and is purified there.

In the present invention, garbage means paper waste, wood waste, fiber waste, glass waste, ceramic waste, rubber waste, metal waste, construction waste, waste plastics, slag, sludge, vegetables and fruits from households and restaurants, Grains, meats, seafood, seaweeds, cooking residues of oils and fats, foods left over, food manufacturing plants (for example, tofu, konjac, yuba, udon, buckwheat, potato chips, kamaboko, chikuwa, starch, agar, gelatin, etc. Animal and plant waste from the manufacturing plant), or combustion products obtained by completely or partially burning these wastes in an incinerator, or neutralized products obtained by adding slaked lime, quick lime, caustic soda, dolomite, etc. to these Means

In the present invention, as described above, the capping sheet used for coating dust is a material other than polyolefin, preferably vinyl polymer, polycondensation polymer, ring-opening polymer, polyaddition polymer, addition condensation. A woven fabric, a non-woven fabric, a knitted fabric, a reticulated product or a perforated film made of a polymer, a natural polymer, an inorganic substance and a metal, etc., and a film made of a photodegradable polymer are integrated. However, this will be described in detail below. Vinyl polymers include styrene, α-methylstyrene, p-methylstyrene, t-butylstyrene, allylbenzene, butanediene, isoprene, chloroprene, vinyl fluoride, vinyl chloride, vinyl bromide, vinylidene fluoride, vinylidene chloride, Vinylidene bromide, tetrafluoroethylene, trifluoroethylene, chlorotrifluoroethylene, dichlorodifluoroethylene,
Vinyl acetate, vinyl propionate, methyl acrylate,
Ethyl acrylate, butyl acrylate, octyl acrylate, stearyl acrylate, methyl methacrylate, octyl methacrylate, stearyl methacrylate, methacrylic acid, itaconic acid, methylene glutaric acid, itaconic anhydride, methyl vinyl ketone, phenyl vinyl ketone, Ethyl vinyl ketone, methyl isopropenyl ketone, methyl vinyl ether, ethyl vinyl ether, phenyl vinyl ether, vinyl thioether, acrylonitrile, acrylamide, acryl dimethylamide, dimethylaminoethyl methacrylate, 2-hydroxyethyl acrylate, glycerin methacrylate, glycidyl acrylate, glycidyl methacrylate. , Allyl acrylate, allyl methacrylate, ethylene glycol diacrylate, divinyl ether Ether, N- vinylpyrrolidone, N
-Vinylimidazole, ethylmaleimide, N-vinylphthalimide, vinylpyridine, N-vinylcarbazole, N-vinyl-N-methylacetamide, N, N-dimethylaminoethyl acrylate, t-butylacrylamide, methacrylamide, t-butylaminoethyl Methacrylate, vinyl sulfide, trimethoxyvinylsilane, triethoxyvinylsilane, γ-methacrylopropyltrimethoxysilane, vinyltrichlorosilane,
It is a homocopolymer or copolymer such as diphenylmethylvinylsilane. Also, when producing these polymers,
A small amount of propylene, butene-1,
4-methylpentene-1, hexene-1, octene-
1, nonene-1, decene-1, tetradecene-1, octadecene-1, etc. may be present and copolymerized. A polycondensation polymer is a polymer obtained by polymerizing a compound having a functionality of two or more while repeating a condensation reaction, such as nylon,
Examples thereof include polyethylene terephthalate, polyamide imide, polyimide, polybutylene terephthalate, polycarbonate, polyurethane, polysulfone, aromatic polyether, and heterocyclic polymer. The ring-opening polymer is a ring compound in which a cyclic compound is opened and they are added to each other to form a linear polymer. Examples of the cyclic compound include cyclic ethers, lactones, lactams, acid anhydrides, imides, and cyclic carbonates. Examples of the ring-opening polymer include polyamide, polyester, polycaprolactone, and the like.
Examples thereof include polysiloxane, polyethylene oxide, polypropylene oxide, polyacetal and the like. The polyaddition polymer is a polymer obtained by a reaction involving the movement of hydrogen during the addition reaction, and examples thereof include polyurethane, epoxy resin, polyguanidine, nylon 3, polyimine, polythioetherimine, polyimide, polyamide, and polythioether. To be The addition condensation polymer is a polymer obtained by a reaction in which an addition reaction and a condensation reaction occur repeatedly, and examples thereof include a phenol resin, a urea resin, and a melamine resin. Natural polymers are silk, wool,
Cotton, mohair, angora, alpaca, cashmere, hemp, silk banana, pineapple fiber, ramie, linen, rayon, tencel, chitin, chitosan, collagen fiber, algin fiber, acetate, triacetate, wood pulp, three-pronged, ramie, ramie It is a fiber. The inorganic substances include glass fibers, rock fibers, ceramic fibers, alumina fibers, carbon fibers and the like. Metal means aluminum fiber, stainless fiber,
Such as iron fiber.

In the present invention, the photo-disintegrating polymer is a polymer which is disintegrated by light, for example, ethylene-carbon monoxide copolymer, ethylene-carbon monoxide-ethylenically unsaturated compound copolymer, crystallinity 20. To 30% syndiotactic 1,2-polybutadiene, vinyl aromatic monomer and conjugated diene 0.1 to 9.5% by weight copolymer, photosensitizer-containing plastics, transition metal compound-containing plastics Among them, ethylene-carbon monoxide-ethylenically unsaturated compound copolymer is preferable from the viewpoints of cost, processability, disintegration property, film initial strength and the like. The ethylene-carbon monoxide-ethylenically unsaturated compound copolymer has ethylene as a main constituent, and carbon monoxide or a copolymer of carbon monoxide and an ethylenically unsaturated compound, The copolymerization ratio of carbon oxide is preferably 0.5 to 10% by weight, but if it is less than 0.5% by weight, the photodegradation rate is remarkably small, and if it exceeds 10% by weight, the photodegradation rate is conversely. Is too large and the photodegradability deteriorates in a short time, which is not desirable. Further, as the ethylenically unsaturated compound,
Vinyl acetate, vinyl butyrate, (meth) acrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate,
Butyl (meth) acrylate, maleic acid, fumaric acid, acrylonitrile, acrylamide, vinyl methyl ether, vinyl phenyl ether, styrene, vinyl chloride,
Propylene, butene-1, hexene-1, octene-
1, decene-1, 4-methylpentene-1 and the like, but cost, film strength, heat resistance, gloss,
Vinyl acetate and ethyl acrylate are preferable in terms of haze and the like. Furthermore, when such an ethylenically unsaturated compound is copolymerized with ethylene together with carbon monoxide, photodegradation rapidly occurs after a certain period of time, and the transparency of the capping sheet is increased. When an ethylenically unsaturated compound is copolymerized, the copolymerization ratio is preferably 1 to 20% by weight, but if it is less than 1% by weight, the effect of the copolymerization will not be exhibited and it will exceed 20% by weight. However, not only does the effect of copolymerization reach the saturation point and does not rise further, but also the strength of the capping sheet decreases.

The photodisintegrating polymer used in the present invention can be prepared by the method disclosed in the following patent publications: US Pat. No. 2,497,323, 2641590, 3083184,3.
248359, 3530109, 3676401, 36
89460, 36941412, 3780140, 383
5123, 3929727, 3948832, 3948
850, 3948873, 3968082, 39843
88, 4024104, 4024325, 402432
6,4076911, 4143096, 413738
No. 2,413,952,4143096,4304887 Japanese Patent Publications Sho 53-128690, Sho 53-128691, Sho 62
-115026, Hei 1-153723 Japanese Patent Publication No. 50-39705. Specifically, the following method for producing a photo-disintegrating polymer can be exemplified: Using a high-pressure low-density polyethylene production apparatus, under the conditions of a reaction temperature of 150 to 300 ° C. and a pressure of 500 to 3000 atm, dilauroyl peroxide is used. , Tert-butyl peroxide, tert-butyl perisobutyrate, tert-butyl peracetate or α, α'-azobisisobutyronitrile and other free radical generators as an inert organic solvent such as benzene, kerosene or mineral oil. Injecting what was melted in the reactor into the reactor and copolymerizing ethylene with carbon monoxide and, if necessary, other ethylenically unsaturated compound, using a medium- and low-pressure method high-density polyethylene production apparatus, reaction temperature 50 Coordination catalyst or metal catalyst (Ziegler type, Natta type or Phillips type etc.) In the presence of), a method of copolymerizing ethylene with carbon monoxide and optionally other ethylenically unsaturated compound by a slurry method, a solution method, a gas phase method or the like.

In the present invention, the photodisintegrating polymer may be blended with a microbial disintegrating polymer. This microbial disintegrating polymer means a polymer that can be decomposed by microorganisms in a waste treatment plant, such as polycaprolactone (eg:
Trade name TONE, manufactured by Union Carbide Co .; trade name Praxel, manufactured by Daicel Chemical Co., Ltd.), aliphatic polyester polycondensed from glycol and aliphatic dicarboxylic acid (Example: trade name Bionore, Showa High Polymer), poly-β- Copolymer of hydroxybutyric acid and β-hydroxyvaleric acid (ex: trade name Piopol, manufactured by ICI), IPN alloy of starch and modified polyvinyl alcohol (ex: trade name: Matterby, Novamont), starch-blended polyethylene (Example: Product name Eco Star, manufactured by Hagiwara Kogyo), Acetobacter
Cellulose produced by fungi (eg, trade name: bacterial cellulose, made by Ajinomoto), Alcaligenes, Agrobacterium, Agto
Microbial polysaccharides produced by racterium bacteria (eg, trade name Pullulan, Hayashibara Shoji; trade name Curdlan, Takeda Yakuhin), poly-γ-methyl glutamate (eg, trade name polyglutamic acid, Ajinomoto), cellulose, Hemicellulose-2, pectin, starch, polymers having a lignin structure [poly (4-hydroxystyrene), poly (4-hydroxy-3-methoxystyrene), poly (4-hydroxy-3,5-dimethoxystyrene), etc.] , Chitin, chitosan, alginic acid, polyvinyl alcohol, polyether, a copolymer of lactic acid and glycolic acid (eg, trade name Resomer, manufactured by Boehringer Ingelheim), etc., and these may be used alone or in a mixture. , Or mixed with other polymers. Other polymers include polypropylene, high-density polyethylene, linear low-density polyethylene, high-pressure low-density polyethylene, ethylene-vinyl acetate copolymer, ethylene-acrylic acid ester copolymer, acetalized ethylene-vinyl alcohol copolymer. , Ionomers and the like are preferable.

The woven fabric, non-woven fabric, knitted fabric, reticulated product or perforated film which is the base material of the capping sheet in the present invention is, for example, a monofilament made of the above polymer,
It can be manufactured from flat yarns, split yarns or films. Monofilament thickness is 100-6000
Denier, circular cross section, elliptical and irregular shaped monofilament, flat yarn is a tape-like yarn having a thickness of about 400 to 15,000 denier, and split yarn has a thickness of 1000 produced by shearing a film. ~ 200000
Denier fibers (what are called defibrated yarns, wariffs, etc.)
, Which may be stretched or unstretched. Further, the reticulate material can be produced not only from the above monofilament, flat yarn or split yarn, but also by melting polyolefin in an extruder and extruding from a die having a special shape to produce it all at once. The perforated membranous material has a perforated structure during film formation and is water-permeable. As the method, a special extrusion die is used to intermittently form holes or other shaped spaces in the film, a method of stretching the film, a method of forming a hole in the film with a needle, and a method of pressing the film with a press. Examples thereof include a method of forming a hole or a space having another shape, a method of irradiating the film with a laser beam, and the like.

The various polymers constituting the capping sheet in the present invention, the photo-disintegrating polymer and the microbial disintegrating polymer which may be appropriately used include a deodorant / deodorant,
Dogs, cats and bird dislike agents may be added. deodorize·
The deodorant is for adsorbing or chemically binding the odor generated from waste to prevent residents in the vicinity of the waste treatment site from becoming uncomfortable. Flavonoids, catechins, terpenes, wood vinegar, aliphatic polycarboxylic acid. , Phytoncide,
Copper chlorophyllin sodium, 1,4-naphthoquinone,
Baicalin, plantaginine, isocartamidine, sodium perborate, hypochlorous acid, manganese dioxide, permanganate, benzoquinone, naphthoquinone, glyoxal, acrolein, 1,2-propylene oxide,
1,2-n-butylene oxide, copper sulfate, zinc sulfate, activated carbon, silica gel, zeolite, alumina gel, Otani stone powder, cristobalite, zinc oxide, magnesium oxide,
Calcium oxide, titanium oxide, iron oxide, calcium carbonate, magnesium carbonate, a composition consisting of ferrous sulfate and sodium bicarbonate, a composition consisting of ferrous sulfate and acid clay, ferrous sulfate, ferrous chloride It is a single compound or a plurality of compounds selected from a composition comprising an iron (II) compound selected from iron and ferrous nitrate and L-ascorbic acid. Some of these cannot be directly kneaded with the polymer, but they can be used if an inorganic porous adsorbent, cyclodextrin, etc. are used in combination. Dog, cat and bird aversion agents are captive sheets coated on the trash when the food items in the trash are approached by these small animals as they prey on them, causing an offensive odor. , For escaping, cycloheximide, menthol, formic acid, 2-butoxyethanol, limonene, bis (2-chloroisopropyl) ether, cyclohexanone, isophorone, methylnonylketone, methylphenylketone, orangegrass oil, lemongrass oil, Selected from citral, N, N-diethyl-m-toluamide, allyl isothiocyanate, rhenonyl ratatone, 1,17-diguanidino-9-azaheptadecane (salt), bis (dimethylthiocarbamoyl) disulfide, ethylthiomethone, isothioate, etc. 1 or 2 or more Zeolite, silica gel, alumina gel, vermiculite, perlite, cristobalite, crisbal, sillal balloon, leeche stone, pumice stone, Otani stone, activated clay, kaolin, hydrotalcite, talc, bentonite, snowtex, cyclodextrin. When it is adsorbed or clathrated on the like, it is preferable because the plastics can be easily kneaded.

The various polymers of the capping sheet of the present invention, the photo-disintegrating polymer and the microbial-disintegrating polymer which may be appropriately used may further include an antistatic agent, an antifogging agent, a lubricant, a stabilizer, an antioxidant and a processability. You may add a improver, a pigment, a filler, a fragrance | flavor etc. in the range which does not impair the objective of this invention.

The above-mentioned various polymers, photo-disintegrating polymers and microbial-disintegrating polymers which may be appropriately used are prepared by mixing each component mixture with a Banbury mixer, a pressure kneader, a twin screw extruder, a Busco kneader, a Henschel mixer, a roll kneader. It can be obtained by a conventional kneading method using, for example, kneading under heating (usually 80 to 200 ° C.) with sufficient shearing force, extruding and pelletizing. Further, the photo-disintegrating polymer layer or the layer of the photo-disintegrating polymer and the microbial-disintegrating polymer can be produced by an inflation tubular film production method, a T-die casting method or the like, and a substrate (woven fabric, nonwoven fabric, It is preferable to laminate-coat directly on a knit, net or perforated film, but other methods such as overlapping the two, laminating the two with an adhesive, sewing with a sewing thread, and partly heat sealing The thickness of the coating layer (photo-disintegrating polymer layer in which a microbial-disintegrating polymer or the like may be blended) may be 2 or more.
It is 0 to 1000 μm, preferably 50 to 400 μm.
If it is less than 20 μm, the mechanical strength of the capping sheet becomes low and it is easy to break it. If it exceeds 1000 μm, the time required for the collapse is two years or more, and the next dust layer is formed on the capping sheet before it collapses. This is because it is discarded and not desirable.

In the capping sheet of the present invention, the base material, woven fabric, non-woven fabric, knitted fabric, net-like product or perforated film-like product, preferably has a light shielding rate of less than 50% and is water permeable. When the light-shielding rate is 50% or more, when the photodegradable polymer layer is used on the lower side (ground side), sunlight is blocked, the photodegradable polymer layer does not collapse for a long period of time, and rainwater penetrates. This is because the purpose of the present invention cannot be achieved without carrying out the treatment, and if the layer is not water permeable, this layer does not allow rainwater to permeate and the purpose of the present invention cannot be achieved. Further, it is desirable that these woven fabrics, nonwoven fabrics, knitted fabrics, net-like products or perforated film-like products have high mechanical strength in the initial stage of use. Further, in the present invention, it is preferable that the capping sheet has the photo-disintegrating polymer layer on the ground side because the collapsed film-like material does not scatter. However, it is needless to say that the photodisintegrating polymer layer may be placed on the upper side (sun side) when it is desired to accelerate the disintegration of the film-like material made of the photodisintegrating polymer.

[0019]

In the waste treatment method of the present invention, as described above, the wastewater is leveled by coating the waste with the capping sheet coated with the photodegradable polymer, and the rainwater is made to flow into the waste. That is, since the capping sheet is used to cover the trash at the beginning, the sheet is waterproof and non-breathable, so rainwater does not penetrate into the trash and has the function of blocking the bad odor generated from the trash, and the passage of time. At the same time, the coating layer of photo-disintegrating polymer collapses, many fine holes are evenly formed on one surface of the sheet, rainwater penetrates evenly into the dust layer, dissolves a certain amount of water-soluble substance in the dust, and waterproof treatment The load on the site is made uniform, and sewage does not overflow untreated. In addition, when the photo-disintegrating polymer coating layer in the present invention is replaced with a non-photo-disintegrating polymer coating layer, it becomes a permanent closed system and the elution of inorganic salts and calcium components does not proceed, so the water treatment period is as long as about 10 years. Moreover, since the stabilization of the ground is not promoted, the early use of the site becomes difficult in practice.
In the waste disposal method of the present invention, the operation of laying a capping sheet on the waste is repeated each time the waste is brought into the waste disposal site and reaches a certain amount.
Therefore, the uppermost layer is always covered with the capping sheet without fine holes, so that the bad odor of dust is not dissipated to the surroundings and the environment is not deteriorated. In addition, it is necessary to allow rain that has fallen to the side surface that is higher than the drainage groove to flow into the drainage groove that is located higher than the laying position of the capping sheet, and not to flow into the lower waste. By discharging the wastewater to the outside, it is possible to further reduce the burden on the treatment capacity of the sewage treatment plant.

[0020]

EXAMPLES The present invention will now be described based on examples.
The present invention is not limited to these. In the examples,% and parts are based on weight. Example 1 A polyester yarn having a width of 4 mm and a thickness of 25 μm was woven as a warp yarn and a weft yarn to obtain a flat yarn woven fabric, and an ethylene-carbon monoxide copolymer having a carbon monoxide content of 3% was obtained on the surface thereof. Was extruded from a T-die with a thickness of 50 μm and laminated to obtain a capping sheet. This sheet was heat-sealed to obtain a square capping sheet having a side of 20 m. FIG. 1 is a cross-sectional view of the refuse processing plant 1. In the figure, 2 is the soil of the landfill site, the bottom surface is flat, the drainage port 3 is provided in the center, and the rainwater that has passed through the wastewater passes through the drainage channel 4 from the drainage port 3. Sent to a sewage treatment plant (not shown) for purification. On the other hand, the side surfaces of the refuse treatment plant 1 are stepwise with the diameter increasing toward the top, and drainage grooves 5, 6, 7 are provided in the flat surface thereof.
A waterproof sheet 8 is laid all over the bottom surface and side surfaces. At the bottom of this waste treatment plant 1, 15 m ^{3 of} garbage 9 obtained by heating garbage generated from ordinary households and garbage containing vinyl chloride resin film at 500 ° C.
At a height of, the capping sheet 10 is coated on the dust, and the periphery of the sheet 10 is coated with a soil (not shown) having a width of 50 cm and a height of 20 cm and fixed to the drainage channel 5, The rainwater around the sheet 10 and the rainwater on the sheet 10 at the initial stage of coating were allowed to flow into the drainage groove 5. For a while, no odor of garbage was felt, there was no scattering of garbage, no hunting by dogs, cats, birds, etc. occurred, and no fly flies were observed. Capping sheet 1
0 Since rainwater is blocked at the beginning of coating, rainwater does not cause a sudden increase in the burden on the sewage treatment plant by dissolving harmful or organic components in the waste at one time. The photo-disintegrating polymer layer of the capping sheet collapses with the passage of time, and 50% of the rainfall amount is 1 month after the coating and 9% is the second month.
Although it passed through 0% and penetrated directly into the waste layer, in this case, the amount of water-soluble substance in the waste dissolved in rainwater was leveled because the rainwater penetrated into the waste evenly from the entire capping sheet, and the wastewater was leveled. It was within the processing capacity of the treatment plant. After that, the garbage was carried in six times, and the capping sheet was coated each time, and the treatment status of the wastewater treatment plant was observed. In all cases, the treatment capacity was within the range. Note that FIG. 2 is a cross-sectional view when the second-layer dust 11 is carried in on the capping sheet 10 that has undergone photo-degradation to a certain degree, and the same capping sheet 12 is covered thereon. In this case, the drainage to the drainage channel 5 is sent to the sewage treatment plant like the drainage from the drainage port 3.

Comparative Example 1 The same as Example 1 except that the photo-degradable polymer was replaced with a non-photo-degradable polymer (high-pressure method low-density polyethylene) in Example 1 and no drain was provided on the side surface of the waste treatment plant. Similar experiments were conducted. Although the rainwater was completely shut out with the capping sheet in the early days, the burden on the sewage treatment plant could be reduced, but because this condition persists, the soil does not progress toward soil and water-soluble components are also contained in the waste. As the amount of waste carried in increased, the amount of rainwater inflowed from the seams of the capping sheets and the surrounding area in a short time, and the treatment capacity of the wastewater treatment plant was exceeded.

Example 2 An experiment similar to that of Example 1 was carried out, having 5 side surfaces each having a tilt angle of 30 degrees and a height of 3 m and a drainage groove provided in each step plane portion. Rainwater at a position higher than the uppermost capping sheet was allowed to flow out of the drainage grooves (in the case of FIG. 1, from the wastewater grooves 6 and 7) to the outside of the system, so that the load on the wastewater treatment plant was not increased.

Comparative Example 2 The same experiment as in Example 2 was carried out except that the function of the drainage channel in Example 2 was abolished, and a large amount of rainwater flowed into the garbage in a short time, and the water-soluble components in the garbage were collected. Since a large amount is dissolved and sent to the sewage treatment plant, it exceeds the treatment capacity of the sewage treatment plant, and therefore the wastewater containing harmful components must be overflowed.

Example 3 In place of the flat yarn woven fabric in Example 1, a nylon waiff-like material (the size of which is based on Nisseki Warif HS3000) was used, and an ethylene-carbon monoxide copolymer (containing carbon monoxide) was used. The same experiment as in Example 1 was performed, except that a capping sheet coated with a 100 μm-thick equivalent mixture of polycaprolactone) was used. Rainwater passage rate is 80% in 2 months after coating and 98% in 3 months,
All were within the treatment capacity of the sewage treatment plant.

Example 4 Instead of the flat yarn woven fabric of Example 1, polyacrylonitrile net [measured by Nisseki COMWED multi net OV1690 (polypropylene mesh 17 × 19)
Example 1 except that a capping sheet coated with an ethylene-carbon monoxide copolymer (carbon monoxide content 7%) to a thickness of 300 μm was used. The same experiment was performed. Rainwater passage rate is 30% for 1 month after coating, 70% for 2 months and 90 for 3 months.
%, And all were within the treatment capacity range of the sewage treatment plant.

Example 5 Unitika 20451FLV (polyester spunbonded nonwoven fabric, basis weight 13 g / m ² , thickness 70 μm) was used in place of the flat yarn woven fabric in Example 1, and high pressure low density polyethylene (density 0. 924 g / ml,
The same experiment as in Example 1 was carried out except that a capping sheet having a thickness of 30 μm coated with a resin composition prepared by mixing 100 parts of melt index (3.2 g / 10 min) with 3 parts of cobalt acetylacetonate was used. The rainwater passage rate was 60% one month after coating and 85% two months after coating, both of which were within the treatment capacity of the sewage treatment plant.

Example 6 As Example 1 except that a capping sheet was used which was prepared by coating the ethylene-carbon monoxide copolymer (carbon monoxide content: 2%) in a thickness of 50 μm on Japanese paper produced from trigeminal bark. Similar experiments were conducted. Rainwater passage rate is 75 two months after coating
% Was 87% in 3 months, and both were within the treatment capacity of the sewage treatment plant.

[0028]

In the waste treatment method of the present invention, a capping sheet in which a film-like material made of a photodisintegrating polymer is integrated is used for dust covering. It does not permeate inside, does not emit offensive odors from the waste to the surroundings, and after the passage of time, the permeation of rainwater is leveled and occurs evenly throughout the waste.
A large amount of rainwater does not penetrate into the waste in a short time, and harmful water-soluble components do not elute at one time, and the treatment capacity of the wastewater treatment plant is not exceeded. Moreover, by providing the drainage groove on the side surface of the waste treatment plant, it is possible to further prevent a large amount of rainwater from penetrating into the waste in a short time and the temporary elution of the water-soluble component. Therefore, the waste treatment method of the present invention contributes to environmental protection and beautification without releasing pollutants to the environment.

[Brief description of drawings]

FIG. 1 is a cross-sectional view when depositing a first layer of dust in an embodiment of the dust treatment method of the present invention.

FIG. 2 is a cross-sectional view of a second layer of dust deposited in an embodiment of the dust treatment method of the present invention.

[Explanation of symbols]

 1 Waste treatment plant 2 Soil 3 Drainage port 4 Drainage channel 5,6,7 Drainage channel 8 Waterproof sheet 9,11 Garbage 10,12 Capping sheet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nao Inoue 222-1-203 Imainishi-cho, Nakahara-ku, Kawasaki-shi, Kanagawa Prefecture (72) Kunihiro Hirose 2-24-3-103 Kunihiro Hirose, Kawasaki-shi, Kanagawa Prefecture

Claims (4)

[Claims] 1. A waste having a drainage port connected to a sewage treatment plant on a bottom surface, a side surface having a step-like shape and a drainage groove on a flat surface thereof, and a waterproof sheet being laid on the bottom surface and the side surface. Garbage is deposited at the treatment plant, and a capping sheet that is a woven fabric, a non-woven fabric, a knitted fabric, a reticulated product or a perforated film made of a material other than polyolefin and a film made of a photodegradable polymer is integrated on the capping sheet. A waste treatment method characterized by covering, leveling rainwater, flowing it into the waste, and sending it from a drain to a sewage treatment plant. 2. The waste treatment method according to claim 1, wherein the operation of depositing dust and coating the capping sheet thereon is repeated a plurality of times. 3. The waste treatment method according to claim 1, wherein the drainage groove located at a position higher than the capping sheet causes the rainfall to flow into a side surface located at a position higher than the drainage groove and is discharged out of the system of the waste disposal site. 4. The material other than polyolefin is selected from the group consisting of vinyl polymers, condensation polymerization polymers, ring-opening polymerization polymers, polyaddition polymers, addition condensation polymers, natural polymers, inorganic substances and metals. Described garbage disposal method.