JP2003047389A - Germination-suppressing material, germination- suppressing construction and method for suppressing germination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a germination-suppressing material capable of suppressing germination of plants such as weeds and the like by effectively using sludge discharged in a large amount and provide a germination-suppressing construction and a method for suppressing germination. SOLUTION: This germination-suppressing material is produced by adding a sludge-solidifier containing calcium oxide to the sludge. This germination- suppressing material is laid in a layer state having a thickness W on the surface M part of a ground of an objective point P. When the laid surface 8 is pressed, the laid layer is compressed to be a water impermeable layer having >=ca.10<5> coefficient of permeability and a laid product 7 is formed on the surface M part of the objective point P for suppressing germination. Germination and growth of a large number of weeds such as bamboo, ferns, Japanese pampas grass, grass family and the like are suppressed for a long period.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an anti-germination material, an anti-germination laying material, and an anti-germination method capable of suppressing the germination of weeds and the like by the granular soil produced by regenerating sludge.

[0002]

2. Description of the Related Art Recently, environmental protection on a global scale has been clamored for. However, disposal of organic sludge such as sludge, oil mud and food residue, and inorganic sludge such as construction sludge has become a social problem. ing. For example, the emission of construction sludge in Japan is said to reach about 10 million tons per year, and most of it is landfilled at the final disposal site. However, at present, there is a shortage of final disposal sites all over the country, and it is difficult to construct new facilities due to the shortage of construction sites. For this reason, efforts are being made to recycle large amounts of sludge.

On the other hand, unpaved ground such as road shoulders, waterway management slopes, farm road slopes, ridges of fields and paddy fields is ground paved with asphalt or concrete (hereinafter referred to as "paved ground" in this section). The soil on the ground surface is exposed and exposed. Therefore, when the unpaved ground is left for a long time, weeds germinate from the surface of the ground and vegetate (grow), and the landscape of the paved ground adjacent to the unpaved ground is impaired. Moreover, overgrown weeds on shoulders of roads, slopes of farm roads, and ridges hinder the passage of vehicles and people.
For this reason, generally, on the above-mentioned unpaved ground, weeds are regularly sprayed or mowed to remove weeds.

[0004]

[Problems to be Solved by the Invention] However, although sludge recycling activities are promoted as described above,
The recycling rate is not sufficient. For this reason, a large amount of sludge is still being landfilled at the final disposal site, and there is a problem that it is necessary to further improve the sludge recycling rate.

Further, the weeds vegetated on the unpaved ground such as the shoulders of the roads described above have strong reproductive power and grow in a short period of time. For this reason, it is necessary to spray herbicide and mow frequently in a short cycle on unpaved ground.
There has been a problem that the cost required for these operations increases significantly. In addition, since the unpaved ground such as the shoulders of the road covers a wide area, there is a problem that a great burden is imposed on a worker required for the spraying of the herbicide and the mowing work.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to effectively reuse sludge discharged in a large amount to suppress germination of plants such as weeds. It is intended to provide materials, anti-germination laying materials and anti-germination method.

[0007]

Means for Solving the Problems To achieve this object, the anti-germination material according to claim 1 is a granular soil laid on the surface of a target ground in order to suppress germination of weeds and the like,
The granular soil hydrates water in the sludge and calcium oxide by mixing sludge and calcium oxide, and sludge particles in the sludge are removed through calcium hydroxide generated by the hydration reaction. Aggregates are formed, and the calcium hydroxide is changed to calcium carbonate by carbon dioxide gas. Further, the anti-germination material according to claim 2,
The anti-germination material according to claim 1, wherein the granular soil has a pH value.
It is alkaline with a value of more than about 8.

The anti-germination laying material according to claim 3 is for suppressing the germination of weeds and the like on the surface of the target land. By mixing sludge and calcium oxide, the water content and calcium oxide in the sludge are removed. The sludge particles in the sludge are aggregated through a hydration reaction and the calcium hydroxide produced by the hydration reaction.Furthermore, a granular soil in which the calcium hydroxide is converted to calcium carbonate by carbon dioxide gas is generated. The granular soil is laid in layers with a predetermined thickness on the surface of the target ground, and the laying layer of the granular soil is made impermeable by pressing.

The anti-germination laying material according to claim 4 is the same as that according to claim 3.
In the described anti-germination laying, the granular soil is alkaline with a pH value of more than about 8. The anti-germination laying material according to claim 5 is the anti-germination laying material according to claim 3 or 4, wherein the permeability of the laying layer of the granular soil is approximately 10.
^{It is set to 5} or more.

The anti-germination method according to claim 6 is a method for suppressing the germination of weeds and the like on the surface of the target land, wherein sludge particles in the sludge are mixed with calcium hydroxide by mixing sludge and calcium oxide. The laying process of laying the granular soil, which has been aggregated through and whose calcium hydroxide has been changed to calcium carbonate by carbon dioxide gas, in a layered manner with a predetermined thickness on the target ground surface, and by the laying process And a pressure step of pressing the laid surface of the granular soil to make the laid layer of the granular soil an impermeable layer.

The anti-germination method according to claim 7 is the anti-germination method according to claim 6, wherein in the pressing step, the granular soil is laid so that the hydraulic conductivity of the laying layer of the granular soil is about 10 ⁵ or more. Pressurize the surface.

The anti-germination material, anti-germination laying material and anti-germination method of the present invention described above function as follows. Specifically, when the granular soil is laid in a layer with a predetermined thickness on the surface of the target ground, calcium carbonate in the granular soil is exposed to carbon dioxide in the atmosphere and acid rain (carbonic acid, etc.) on the surface of the laying layer of the granular soil. It is neutralized by reacting with the acid contained in the acidified rainwater). Therefore, alkali damage around the target surface is suppressed. Moreover, since calcium carbonate in the granular soil has a low affinity with water, it is possible to prevent the granular soil generated from the sludge from becoming mud again due to rainwater or the like.

By the way, generally, weeds grow in a pH range of soil in the range of about 3 to 8. Here, since the pH value of the granular soil is alkaline exceeding approximately 8, if the granular soil is laid on the target ground surface with a predetermined thickness, the pH value of the target ground surface where the laying layer of the granular soil is provided. Exceeds about 8. Therefore, it is possible to suppress the germination and growth of weeds on the surface of the target ground, that is, on the surface where the granular soil is laid.

If the laying surface of the laying layer of the granular soil is pressed to make the laying layer of the granular soil an impermeable layer, the permeation of acid rain into the deep portion of the laying layer is suppressed. For this reason, even if the surface portion of the laying layer of the granular soil is neutralized, the deep portion of the laying layer is kept alkaline, and the alkalinity suppresses germination and growth of weeds. Moreover, by making the laying layer of granular soil an impermeable layer in this way, rainwater permeates to the target surface, various nutrients permeate to the target surface, and sunlight is blocked. Of water, nutrients and photosynthesis necessary for germination and growth of sorghum. As a result, the germination and growth of weeds are further suppressed. The laid layer of granular soil is a water impermeable layer capable of sufficiently preventing permeation of rainwater and the like by having a water permeability coefficient of about 10 ⁵ or more.

Further, the laying layer of granular soil has a lower strength than pavement such as concrete. Therefore, an agricultural machine tool such as a hoe or a pickaxe will not be damaged even if it comes into contact with the laid layer of granular soil, and the laid layer of granular soil can be easily excavated by the agricultural machine. Also, if the laying layer of granular soil becomes unnecessary, the granular soil dug up from the laying layer is also used as a soil improvement material for paddy fields and fields, partial embankment material, and repair material to repair missing slopes. can do.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the present invention will be described below. The anti-germination material of the present invention is granular soil that has been modified into aggregates by mixing and stirring sludge to which a sludge solidifying agent has been added, and is laid on the target surface where weeds do not want to germinate or grow. Is used. The sludge targeted by this anti-germination material is inorganic sludge such as construction sludge, and organic sludge such as sludge, oil mud or food residue.Hereinafter, these inorganic sludge and organic sludge are collectively referred to as "sludge". The particles that make up this sludge are called sludge particles.

On the other hand, as the sludge solidifying agent added to the sludge, one containing calcium oxide as a main component is used. Specifically, this sludge solidifying agent contains 78.4% calcium oxide,
Silicon dioxide is 9.1%, alumina (aluminum oxide) is 2.6%, iron oxide is 1.3%, and sulfur trioxide is 0.1%.
It has a chemical composition of 6%, 0.9% magnesium oxide, and 6.9% loss on ignition.

An example of the manufacturing process of the anti-germination material of the present invention will be described with reference to FIG. FIG. 1 is a process diagram conceptually showing the manufacturing process of the anti-germination material 5. In FIG. 1, after sludge 1 which is a raw material is stored in a sludge pit which is a storage tank (S1), it is carried out from the sludge pit by a backhoe which is a kind of heavy machinery (S2) and vibrated by a vibrating sieving machine. Sieve is applied (S3). This vibrating screen (S
According to 3), among the sludge particles of sludge 1, the particle size is approximately 10
Those less than mm are screened (S4), and the screened sludge particles are used as the fine particle sludge 2 for producing the anti-germination material 5. On the other hand, the sludge particles contained in the sludge 1 having a particle size of 10 mm or more are vibrated and sieved (S
It is separated and collected by 3) and discharged (S5).

The fine-grained sludge 2 is screened by a vibrating screen (S3) (S4), and then charged into a charging hopper (S).
6) It is transferred to the rotary kiln by the transfer pump (S7). On the other hand, the sludge solidifying agent 3 is stored in the solidifying agent silo which is a storage tank for the sludge solidifying agent 3 (S8),
It is weighed by a weighing device (S9), and an amount corresponding to the mixing ratio with the fine particle sludge 2 is put into the solidifying agent hopper (S1).
0). Here, the amount of the sludge solidifying agent 3 added is the anti-germination material 5
Is adjusted to a pH value of more than about 8 and preferably within a range of about 9.0 to 10.0. The sludge solidifying agent 3 put into the solidifying agent hopper is transferred to the rotary kiln by the screw conveyor (S1).
1).

The rotary kiln has a charging port into which the fine-grained sludge 2 and the sludge solidifying agent 3 are charged, a rotary drum containing the fine-grained sludge 2 and the sludge solidifying agent 3 charged from the charging port, and a rotary drum inside the rotary drum. It is provided with a stirring blade provided and a discharge port for discharging the granular soil 4 which is a mixed reaction product of the fine particle sludge 2 and the sludge solidifying agent 3 from the inside of the rotary drum. The rotary drum of the rotary kiln has a predetermined rotation speed (for example,
When it is rotationally driven at about 5 to 10 rpm), the fine particle sludge 2 and the sludge solidifying agent 3 charged from the charging port are continuously transferred to the discharging side by the stirring blade and mixed and stirred (S12).

By the mixing and stirring by the stirring blades, the water contained in the fine sludge 2 (that is, the surface water and the contained water of the fine sludge 2) and the calcium oxide contained in the sludge solidifying agent 3 are hydrated in the rotary drum. A reaction is caused to generate calcium hydroxide, and the surface of the sludge particles of the fine sludge 2 is covered with this calcium hydroxide. The sludge particles whose surfaces are thus covered with calcium hydroxide are mutually agglutinated through the calcium hydroxide, and the agglomeration produces the granular soil 4 having an aggregate structure from the fine sludge 2.

In the granular soil 4, since the surface of the sludge particles is covered with calcium hydroxide, it is possible to prevent the sludge particles from sticking to each other. For example, the solubility of the granular soil 4 in water is about 0. It can be made as small as 12%. Moreover, since the inside of the rotary drum is heated by the heat generated by the hydration reaction that produces calcium hydroxide, the water content of the granular soil 4 generated from the fine sludge 2 can be further reduced.

When the granular soil 4 is discharged from the rotary kiln outlet to the outside of the rotary drum, it is carried out by the conveyor (S13) and left in the stockyard, which is an indoor or outdoor storage place (S14). When the calcium hydroxide contained in the granular soil 4 reacts with carbon dioxide (carbon dioxide gas) in the atmosphere by this standing, the calcium hydroxide changes into calcium carbonate, and the anti-germination provided with the granular soil 4 containing calcium carbonate. The material 5 is generated. In addition,
Calcium carbonate is a substance having a very low affinity with water, and for example, the granular soil 4 has a solubility in water of about 0.0014.
%. For this reason, it is possible to prevent the granular soil 4 from absorbing water such as rainwater and being transformed into sludge again.

A method of using the anti-germination material 5 will be described with reference to FIG. 2 (a) is a cross-sectional view of the target site P on which the weeds G grow, and FIG. 2 (b) shows a state in which the anti-germination material 7 composed of the anti-germination material 5 is laid on the target site P. It is a sectional view shown, and a plurality of diagonal dotted lines in Drawing 2 (b) show rainwater R. As shown in FIG. 2A, a large number of weeds G such as bamboos, ferns, oysters, and rice families are clustered on the ground surface M of the target site P. Such a target site P
In the case of suppressing the germination and growth of the weed G, the first step is to excavate a predetermined depth W from the surface M, which is the surface layer of the target site P, to the deep portion D, and then the surface M is concave in cross section. The installation recess 6 is constructed.

After the installation recess 6 is constructed, when the granular soil 4 containing calcium carbonate, that is, the anti-germination material 5 is put into the installation recess 6 and buried therein, the anti-germination material is applied to the ground surface M of the target site P. A layered laying layer having a thickness W constituted by 5 is laid (laying step). Then, when the laying surface 8 of the laying layer of the anti-germination material 5 is pressed (pressurizing step), the laying layer is compressed to become an impermeable layer having a permeability coefficient of about 10 ⁵ or more, and the target site P The anti-germination laying 7 is formed on the ground surface M portion. The thickness of the anti-germination layer 7 is preferably about 1
It is in the range of 5 cm to 20 cm, and the hydraulic conductivity of the anti-germination laying 7 is preferably in the range of approximately 10 ⁵ to 10 ⁷ .

As described above, since the anti-germination material 5 is alkaline having a pH value of more than about 8, the anti-germination material 7 is also alkaline having a pH value of more than about 8. However, the surface layer portion 9 on the laying surface 8 side of the anti-germination laying material 7 is
It reacts and is neutralized by coming into contact with rainwater R (that is, acid rain) R having a value of approximately 4.5 to 5.5 and having a carbon dioxide gas in the atmosphere. Therefore, it is possible to prevent the occurrence of alkali damage around the target site P due to the installation of the anti-germination laying 7.

Moreover, since the anti-germination laying material 7 is a water impermeable layer, it is difficult for acidic rainwater R and carbon dioxide gas in the atmosphere to penetrate into the deep portion 10 of the anti-germination laying material 7. Therefore, the deep layer portion 10 of the anti-germination laying portion 7 is
It is possible to maintain alkaline for a long time with a value exceeding about 8. Therefore, the anti-germination laying 7 (anti-germination material 5) can suppress the germination and growth of a large number of weeds G such as bamboos, ferns, oysters and rice families for a long period of time.

The present invention has been described above based on the embodiments, but the present invention is not limited to the above embodiments, and various improvements and modifications can be made without departing from the spirit of the present invention. Is easily guessed.

For example, in this embodiment, as the sludge solidifying agent added to the sludge, calcium oxide is 78.4%, silicon dioxide is 9.1%, alumina is 2.6%, and iron oxide is 1.3%. Sulfur trioxide (0.6%), magnesium oxide (0.9%), and ignition loss were 6.9%. However, the component of the sludge solidifying agent added to the sludge is not necessarily limited to this, and may have another chemical composition as long as it contains calcium oxide.

Further, in this embodiment, among the sludge particles of the raw material sludge 1, those having a particle size of less than about 10 mm are used to generate the anti-germination material 5, while those having a particle size of 10 mm or more are separated. Recovered. However, the particle size is not necessarily 1
It is not necessary to separate and collect sludge particles having a diameter of 0 mm or more. For example, the sludge particles having a particle diameter of 10 mm or more may be crushed to have a smaller particle size and used as a raw material for the fine sludge 2.

[0031]

As described above, according to the anti-germination material, anti-germination laying and anti-germination method of the present invention, since granular soil is produced by mixing calcium oxide into sludge, it is treated as waste. The sludge discharged can be effectively reused, and the recycling rate of such sludge can be improved.

By laying the granular soil in layers on the surface of the target ground, the laid layer of the granular soil can sufficiently suppress the germination of weeds on the surface of the target ground. Therefore,
By constructing a laying layer of granular soil on unpaved ground,
It eliminates the need for herbicide spraying and mowing work for a long period of time, reducing the costs required for these works,
Further, there is an effect that the burden on workers engaged in these works can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a process diagram conceptually showing a manufacturing process of an anti-germination material which is an embodiment of the present invention.

FIG. 2 (a) is a cross-sectional view of a target site where weeds G grow, and FIG. 2 (b) is a cross-sectional view showing a state in which an anti-germination laying material composed of an anti-germination material is laid on the target site. is there.

[Explanation of symbols]

1 sludge 3 Sludge solidifying agent 5 Anti-germination material 7 Anti-germination laying G weed M ground surface (target ground surface) R rainwater

Claims (7)

[Claims] 1. A granular soil that is laid on the surface of an object to suppress the germination of weeds and the like. The granular soil mixes sludge and calcium oxide to form water and calcium oxide in the sludge. Hydration reaction is carried out, the sludge particles in the sludge are aggregated through the calcium hydroxide generated by the hydration reaction, and the calcium hydroxide is converted to calcium carbonate by carbon dioxide gas. Anti-germination material characterized by being 2. The anti-germination material according to claim 1, wherein the granular soil is alkaline having a pH value of more than about 8. 3. An anti-germination laying for suppressing the germination of weeds and the like on the surface of a target land, by mixing sludge and calcium oxide to hydrate the water in the sludge and calcium oxide, and Sludge particles in sludge are aggregated through calcium hydroxide generated by the hydration reaction, and granular soil is used in which the calcium hydroxide is converted to calcium carbonate by carbon dioxide gas. Soil is laid in layers with a certain thickness on the target surface,
An anti-germination laying characterized in that the laying layer of the granular soil is made impermeable by being pressed. 4. The anti-germination laying material according to claim 3, wherein the granular soil is alkaline having a pH value of more than about 8. 5. The anti-germination laid product according to claim 3, wherein the laying layer of the granular soil has a hydraulic conductivity of about 10 ⁵ or more. 6. An anti-germination method for suppressing the germination of weeds or the like on the surface of a target land, wherein sludge particles in sludge are aggregated through calcium hydroxide by mixing sludge and calcium oxide. The laying process of laying the granular soil in which the calcium hydroxide has been changed to calcium carbonate by carbon dioxide in a layer with a predetermined thickness on the target ground surface, and the laying surface of the granular soil laid by the laying process is pressed. Accordingly, the anti-germination method comprising the step of applying a pressure to make the laid layer of the granular soil impermeable. 7. The pressing step is performed in a laying layer of granular soil.
The permeability coefficient is about 10 ⁵Laying surface of granular soil as above
7. The anti-germination method according to claim 6, characterized in that
Law.