JP2948130B2 - How to treat muddy or granular waste - Google Patents

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 sludge, powdery or granular waste.

[0002]

2. Description of the Related Art Sludge of any kind, organic or inorganic, such as water and sewage sludge, sludge, sediment sludge, or its incineration ash, stone powder from quarries, papermaking sludge, incineration ash from various garbage disposal sites, or the like Granular municipal or industrial waste may contain harmful heavy metals such as cadmium, lead, arsenic, and cyanide, and if they are dumped into final disposal sites as they are, they cause soil pollution and water pollution.

[0003] Therefore, a method of solidifying and discarding these so as not to elute is usually employed. Tokiko Sho 55-
Japanese Patent No. 51635 discloses a method of solidifying with cement and asphalt, and Japanese Patent Publication No. 60-7554 discloses a method of solidifying by sintering.

[0004]

However, in the case of solidification with cement or the like, harmful heavy metals are eluted by rainwater due to high alkali. In the case of sintering, the equipment requires high cost. Furthermore, the solidified and granulated treated material is directly dumped in a landfill, which may cause a liquefaction phenomenon. In addition, recently, as disclosed in JP-A-1-218673, by using a chelating agent and a high molecular compound in combination, the chelating agent is reacted with harmful heavy metals to form a chelating compound, which is used as a highly chelating agent. Techniques for containment by molecular compounds have also been proposed. However, this technique is also too expensive to process because the materials used are generally expensive.

It is an object of the present invention to provide a method in which after a temporary treatment for solidifying the waste is carried out, an intermediate treatment product in a fluidized state before the solidification is completed is filled in a predetermined container, and the container is finally filled. It is an object of the present invention to provide a method for treating the waste, which can perform a stable landfill without causing harmful components in the waste to penetrate into the ground at a relatively low cost by burying the waste in a treatment plant. .

[0006]

In order to achieve the above-mentioned object, the method of the present invention is characterized in that it has the following arrangement. That is, in the method of the present invention, a solidifying agent is added to mud-like, powdery or granular waste, and mixed and stirred in the presence of moisture to obtain a fluid intermediate treatment product. This is a waste treatment method in which a container is filled, the intermediate processed material in the container is dried and solidified, then the intermediate processed material input port is closed, and the sealed container is buried in the disposal site. The container to be used is formed of a polyhedron made of a synthetic resin material, and has, on one of its peripheral surfaces, a closable charging port for filling an intermediate product, and upper and lower surfaces with legs that can be stacked and engaged with each other and a recess for receiving the leg. Are further provided on the peripheral surface with projections and recesses which are engaged with each other in the horizontal direction to prevent displacement. Then, once the container is positioned so that the surface having the charging port faces upward, the intermediate processing product is filled from the charging port, and after the intermediate processing product in the container is dried and solidified, the lid is closed. The surface having the input port is positioned in the original circumferential direction. Next, a large number of containers filled with the processed material are arranged in the horizontal direction by engaging the projections and the concave portions, and are stacked and embedded vertically by engaging the legs and the dents.

As wastes to be treated, various sludge, powder, and granular wastes such as sludge or incinerated ash, stone powder in a quarry, paper sludge, or incinerated ash in a garbage disposal plant can be used. Applicable.

Before adding the solidifying agent to the waste, it is preferable to adjust the particle size of the granular waste.

It is desirable that the solidifying agent is obtained by adding a water-soluble cellulose resin to Portland cement. The addition amount of the solidifying agent is based on 100 parts by weight of the waste.
The Portland cement is preferably 20 parts by weight and the water-soluble cellulose resin is preferably 0.04 parts by weight. The moisture adjustment is set to about 40%.

The container for filling the intermediate treatment product is a polyhedron made of synthetic resin. For example, in the case of a substantially regular hexahedron container, the input port is formed in the front wall. The lower wall is provided with a leg, and the upper wall is provided with a recess capable of receiving the leg. Furthermore, a pair of left and right engaging ridges extending in the vertical direction are respectively provided on the left and right side walls, and a pair of left and right concave portions engaging with these engaging ridges are provided on the front wall and the rear wall, respectively. ing.

Further, the container may have a honeycomb shape in cross section. In this case, the lower wall has a leg that can receive the leg, and the upper wall has a recess that can receive the leg. Also, out of the six peripheral walls, every other peripheral wall is provided with an engaging ridge extending vertically, and on every other peripheral wall which does not have this engaging ridge, the above-mentioned engaging ridge is provided. , And each of the peripheral walls is provided with the input port. Then, an inlet for the intermediate treatment product is formed in one of the peripheral walls. A plurality of reinforcing bars extending in the vertical direction may be provided in the inner space of the container body, and a closed air vent hole may be provided in a peripheral wall provided with the inlet.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on illustrated embodiments. FIG. 1 is a flowchart showing an embodiment in which the method of the present invention is applied to the treatment of cinders of garbage.

The collected household garbage is incinerated at an incineration plant to produce incineration ash, usually called cinder, as waste. This cinder is transported by a truck or the like as appropriate and stocked in a stock yard or the like. After adjusting the particles with a crusher or the like, the stored cinders are added to a kneading machine after adding about 40% of the total weight of the waste. If the waste originally contains water, such as stone sludge or sludge itself, the water content is adjusted to be 30 to 40% of the total weight of the waste.

A solidifying agent is simultaneously added to the waste in the kneader. Various solidifying agents such as cement or a polymer compound can be used as the solidifying agent. In the present embodiment, portland cement and a water-soluble cellulose resin are used. The water-soluble cellulosic resin is specifically, methyl cellulose, hydroxypropyl methyl cellulose, or hydroxyethyl methyl cellulose obtained by treating cellulose with caustic soda and reacting with an etherifying agent such as propylene oxide or ethylene oxide. Ingredients. Therefore, this additive is a nonionic water-soluble cellulose ether having a methoxyl group and a hydroxypropoxyl group having relatively large lipophilicity, and has relatively stable properties to acids and alkalis.

The water-soluble cellulosic resin is immediately dissolved in the cement and is dispersed in water added to the waste to improve the viscosity. Then, the waste is cement-solidified by surface tension due to liquefaction crosslinking and adhesion between particles and binding force caused by capillary action. When a water-soluble cellulosic resin is added, the components are strongly bonded to each other, and stable solidification, which is hardly eluted with water, is performed as compared with the case of simply solidifying with cement.

The amount of the solidifying agent is about 20 parts by weight of Portland cement and about 0.04 parts by weight of a water-soluble cellulose resin based on 100 parts by weight of waste. This addition amount is appropriately changed according to the physical properties, particle size, etc. of the waste to be treated. If stone powder is mixed in the solidifying agent at a ratio of, for example, 6 with respect to solidifying agent 4, lumps hardly occur in the kneader.

The waste kneaded by the kneader is taken out in a mortar state and filled in a predetermined container.

The container 1 is formed of a synthetic resin material as a substantially regular hexahedron as shown in FIGS.
In the figure, reference numeral 2 denotes a front wall of which a mortar-like waste inlet 3 (see FIG. 4) is formed substantially at the center.
A cover 4 that can be closed is screwed into the cover. Openings 5 and 5 (see FIG. 4) for venting air are formed at the upper right corner and the lower left corner of the front wall 1 in the figure, and a lid 6 that can close these openings 5 is screwed. In addition, concave grooves 7, 7 extending in the vertical direction are formed on the left and right sides of the inlet 3, respectively.

Reference numeral 8 denotes an upper wall of the container, as shown in FIG. 5, on the surface of which four recesses 9 having an inverted trapezoidal cross section are formed. Further, a suspension bolt 10 is fixed at a position slightly inward from the approximate center of each side of the upper surface wall 8.

Numeral 11 denotes a right side wall of the container. As shown in FIG. 2, two right and left ridges 12, 12 fitted into these concave grooves 7 are provided at positions corresponding to the concave grooves 7, 7 on the front wall 2 described above. It is formed to extend in the up-down direction. Also, left side wall 1
3 also has two right and left ridges 12, 12 like the right side wall 11.
Is provided.

As shown in the plan view of FIG. 5, the rear wall 14 has two left and right grooves 7,
7 is provided.

Further, as shown in FIG.
6. The leg 16 is provided with the recess 9 of the upper wall 8 described above.
To prevent the containers from being displaced in the stacked state, and four are provided at positions corresponding to the recesses 9.

Reference numeral 17 in the figure denotes a reinforcing bar disposed inside the container so as to extend in the vertical direction (see FIG. 6).

To fill the container 1 with the mortar-like waste, first, the container 1 is positioned so that its front wall 2 is on the upper surface (see FIG. 4). In this state, mortar-like waste is introduced from the upwardly-directed inlet 3. Since the two air vent holes 5 are provided, the mortar-like waste is filled up to the inner surface of the front wall 2. After filling, the mortar-like waste inside is cured until it is dried and solidified. The container 1 is provided with the ridges 12 and the concave grooves 7 on its surface wall 2 and has a large surface area, so that the drying time is shortened. After drying, the lids 4 and 6 are fixed to the inlet 3 and the air vent hole 5,
The transport vehicle is loaded by a crane or the like using the suspension bolts 10 on the upper wall 8. The loaded containers 1 are transported to the landfill site of the final disposal site as they are, where they are stacked and constructed.

At the time of construction, the legs 16 of the upper container are fitted into the recesses 9 of the upper wall 8 of the lower container such that the upper wall 8 is on the upper surface, and are sequentially stacked. The horizontally adjacent containers are sequentially connected by engaging the ridges 12 of the left and right side walls 11.13 with the concave grooves 7 of the front wall 2 and the rear wall 14. As a result, all the containers resist the horizontal acting force and are stabilized (FIG. 7).
reference).

The stacked containers add a large weight to the lowermost container, but have reinforcing bars 17 in the vertical direction in the container.
Are formed on the front wall 2 and the rear wall 14 and the left and right side walls 11 and 13 of the container. Never.

Further, even if the mortar-like waste is dried and solidified to reduce the volume and create a gap between the mortar-like waste and the inner surface of the front wall, the gap is located in the vertical direction of the container at the construction site. In addition, the container is not deformed by the stacking load.

The landfill is completed by covering the upper portion of the stacked containers with a cover soil of about 1 m.

FIG. 8 schematically shows a use state of another embodiment of the container used in the method of the present invention. In this embodiment, the container 20 is formed in a substantially honeycomb shape in cross section. Although not specifically shown, the structure of the upper wall and the lower wall is the same as that of the above-described embodiment, and the lower wall is provided with the legs, and the upper wall is provided with a recess capable of receiving the legs. And 6
The two peripheral walls are formed such that the engaging ridges extending in the vertical direction every other one thereof extend in the vertical direction,
Further, a recessed portion which engages with the engagement ridge is formed on every other peripheral wall having no engagement ridge. The inlet is provided on any one of the peripheral walls.

When filling the mortar-like waste, the peripheral wall having the inlet is located on the upper surface, but members for supporting the peripheral wall on the left and right sides of the peripheral wall located on the lower surface are provided for stabilizing sitting. It is good to use.

The containers of this embodiment stacked at the landfill site form a honeycomb as shown in FIG. 8, and have a strong resistance to the vertical acting force. The container may have any of various other polyhedral shapes, and can be used in the method of the present invention.

Further, various kinds of industrial waste can be treated in the same procedure by crushing them with a crusher into powder and granules.

[0033]

[Examples] 100 parts by weight of incineration ash obtained from a garbage incineration plant in Kumagaya City, Saitama Prefecture, 15 parts by weight of cement and 0.0 part of an additive composed of hydroxypropylmethylcellulose.
4 parts by weight were added, and 35 parts by weight of water was added thereto, followed by mixing and stirring in a granulator for 10 seconds, and the obtained granules were dried for 2 days. When this treated product was subjected to a dissolution test for harmful substances contained in the incineration ash, the results shown in Table 1 were obtained.

[0034]

[Table 1]

Most of the detection of incinerated ash is performed based on the method of surveying bottom sediment, and all of the detection of detected substances in the treated material is performed based on the Notification No. 13 of the Environment Agency. Was. As can be seen from Table 1,
The harmful substances contained in the incineration ash hardly elute from the treated product according to the method of the present invention.

[0036]

As described above, according to the method of the present invention,
A fluid intermediate product is obtained by mixing and stirring the mud-like or powdery waste with the solidifying agent, filling this into a corrosion-resistant container, drying it, and then stacking the sealed container as it is. Because it is used for landfill, no harmful substances are eluted and no harmful gas is generated even if the waste contains harmful metals.
The waste can be subjected to permanent safety treatment at a relatively low cost. In addition, the charging port for filling the intermediate processing material is provided on one of the peripheral walls, and the charging port is located on the upper surface during filling, and the charging port is used in a horizontal direction during stacking after drying and solidification, The voids in the inner space of the container due to the decrease in the volume of the intermediate processed product after drying are positioned in the circumferential direction and stacked, so that deformation of the lower container due to the stacked weight can be prevented as much as possible.

When Portland cement is added with a water-soluble cellulose resin as a solidifying agent, the harmful substances can be prevented from being eluted during the intermediate treatment, and a safer treatment method can be used. Can be provided.

Further, according to the container of the present invention, since the container has legs and depressions that can be stacked up and down, it is possible to prevent a displacement at the time of stacking. Since it is provided with the concave portion, it is possible to bury the whole integrated structure in the ground.

By forming the concave and convex for the engagement with the concave groove extending in the vertical direction and the ridge, not only can a large strength against the vertical load be exerted, but also the fluid intermediate processing material filled inside can be exhibited. It can contribute to shortening of the drying time.

[Brief description of the drawings]

FIG. 1 is a flowchart showing a processing method according to an embodiment of the present invention.

FIG. 2 is a perspective view of an example of a container used in the method of the present invention.

1. FIG. 3 is a perspective view of the container shown in FIG.

FIG. 4 is a front view of the container of FIG. 2;

FIG. 5 is a plan view of the container of FIG. 2;

FIG. 6 is a cross-sectional view of the container of FIG. 2 as viewed from the side.

FIG. 7 is a plan view showing a construction state of the container of FIG. 2;

FIG. 8 is a plan view showing the construction state of another example of the container used in the method of the present invention.

[Explanation of symbols]

 1, 20 ... Container 2 ... Front wall 3 ... Input port 5 ... Air vent hole 7 ...・ Concave groove 8 ・ ・ ・ ・ ・ ・ ・ ・ ・ Top wall 9 ・ ・ ・ ・ ・ ・ ・ Recess 11 ・ ・ ・ ・ ・ ・ ・ Right side wall 12 ・ ・ ・ ・ ・ ・ ・ Protrusion 13 ・ ・ ・ ・ ・ ・... Left side wall 14 ... Back wall 15 ... Bottom wall 16 ... Legs

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B65F 1/00 B09B 3/00 ZAB C02F 11/00 101 301S ZAB 301M 301E B65D 21/02 B (56) References JP-A-48-48 JP-A-37886 (JP, A) JP-A-4-63530 (JP, A) JP-A-6-170351 (JP, A) JP-A-57-12708 (JP, A) JP-A-4-135686 (JP, A) JP-A-3-290209 (JP, A) JP-A-4-135685 (JP, A) JP-A-57-88400 (JP, A) JP-A-7-251140 (JP, A) JP-A-2- 87100 (JP, A) JP-A-8-47679 (JP, A) JP-A 8-129100 (JP, A) JP-A 8-243525 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B09B 1/00 B09B 3/00 B65D 21/02 B65F 1/00 C02F 11/00

Claims (6)

(57) [Claims] 1. A solidifying agent is added to a mud-like, powdery or granular waste and mixed and stirred in the presence of water to obtain a fluid intermediate treatment product. After the intermediate processed material in the container is dried and solidified, the intermediate processed material input port is closed, and the sealed container is buried in the disposal site. One of the peripheral surfaces is formed into a polyhedron, and one of the peripheral surfaces is provided with a closable inlet for filling the intermediate processing material, the upper and lower surfaces are provided with legs that can be engaged with each other and recesses for receiving the same, and the peripheral surface is provided with a horizontal direction. The container has a projection and a concave portion which are engaged with each other to prevent displacement, and the container is once positioned so that the surface having the charging port faces upward, and the intermediate processing product is filled from the charging port, and Wait for the intermediate product to dry and solidify before opening the closed Many containers filled with processed material are arranged horizontally by engaging the projections and recesses, while the legs and recesses are engaged and stacked vertically. A method for treating muddy or granular waste, characterized by burying it. 2. The method according to claim 1, wherein the particle size is adjusted before adding a solidifying agent to the waste. 3. The processing method according to claim 1, wherein the solidifying agent is formed by adding a water-soluble cellulosic resin to Portland cement. 4. The method according to claim 3, wherein 20 parts by weight of Portland cement and 0.04 part by weight of a water-soluble cellulose resin are added as the solidifying agent to 100 parts by weight of the waste. Processing method described 5. The processing method according to claim 1, wherein the moisture adjustment is set to about 40%. 6. The method according to claim 6, wherein the waste is sludge or incinerated ash thereof.
The processing method according to claim 1 or 2, wherein the processing method is stone powder, papermaking sludge, or incineration ash from a quarry.