JP2000014239A - Vegetation base material and vegetation base and production of vegetation base material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make use of dehydrated cake subjected to fill disposal through preparing a fill site so as to be suitable for vegetation. SOLUTION: This vegetation base material 12 is obtained by the following process: dehydrated cake is charged from a dehydrated cake feeder 2 into a mixer 1, and a solidifying material such as cement is charged as well from a relevant charger 3; the resulting mixture is then fed into a hopper 8 while finely granulating the mixture in the mixer 1, and the mixture thus finely granulated is fed from the hopper 8 via a conveyance line 10 into the mixer 1 again, where the mixture is finely granulated again and then mixed, via the hopper 8, with a fertilizer in a fertilizer mixer 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for effectively utilizing a dewatered cake formed by dehydrating turbid water generated by washing water for aggregates or the like.

[0002]

2. Description of the Related Art At construction sites such as dams, turbid water containing fine-grained clay is generated due to the production of aggregate (gravel, sand) at the time of placing concrete, the operation of a batcher plant and the foundation treatment, and the rainfall of a raw stone mountain. appear. Each of these turbid waters is sent to a turbid water treatment facility and treated with chemicals and the like.As a method, there is a sedimentation basin method in which turbid water treated sludge is stored in a sedimentation basin excavated in advance by a pump or the like and naturally dried. The dewatered cake is produced by dewatering the above-mentioned sludge with a dewatering device such as a filter press, the dewatered cake is transported by a dump truck or the like, and a mechanical dewatered cake method of embankment at a designated construction waste receiving site or the like. is there. When the above-mentioned sedimentation basin method is adopted, it is necessary to secure a vast sedimentation basin site for processing a large amount of sludge generated in dam construction. A turbid water treatment is performed by a dewatering cake method.

[0003]

However, in the method of embedding the dehydrated cake at the receiving site, a large area of land to be used as the receiving site (a portion capable of securing the embankment capacity) must be secured in advance. And management disadvantages. In addition, since the dewatered cake is in a so-called mud state of 0.2 MPa or less when expressed by a cone index which is an index indicating the strength of the soil, in this state, it is not only inconvenient to transport due to exhibiting fluidity at the time of transport, However, since the above-mentioned state is such that no one can walk on it, even when embedding the dehydrated cake at the receiving site, there is no strength enough to stack one by one and embankment. At the time of transportation by dumping etc., it was necessary to pay attention to handling such as not to drop it on the road. Therefore, in order to continuously dispose of the dewatered cake at the receiving site, the strength of the dewatered cake is improved to a state suitable for the embankment material, and the embankment workability is improved, and the long-term sliding on the embankment is prevented. It was necessary to ensure safety. For this reason, the method of embedding the dehydrated cake at the receiving site has had some limitations in terms of cost, transportation, handling, and throughput.

SUMMARY OF THE INVENTION The present invention has been made in view of the conventional problems, and uses dehydrated cake as a vegetation base material and a vegetation base. In addition, it is possible to provide a method for producing a vegetation base material without limiting the amount of handling and processing, and to enable efficient production of a vegetation base material.

[0005]

According to a first aspect of the present invention, there is provided a vegetation base material in which fertilizer is mixed with a granular material of a dewatered cake obtained by mixing a dewatered cake and a solidifying material such as cement.

According to a second aspect of the present invention, there is provided a vegetation base wherein fertilizer is mixed with granular material of a dewatered cake obtained by mixing a dewatered cake and a solidifying material such as cement, and the fertilizer is blown to a vegetation site by pressure. is there.

According to a third aspect of the present invention, the dewatered cake is granulated and mixed with a solidifying material such as cement to obtain a dewatered cake granular material suitable for a vegetation base material.

[0010] According to a fourth aspect of the present invention, the dewatered cake that has been granulated for the first time is granulated again.

In the invention according to claim 5, the granulation treatment for the first time or the second time is performed by using a granulation device for shredding a dehydrated cake.

According to a sixth aspect of the present invention, the first or second granulation treatment is performed by passing the dehydrated cake through a paddle mixer and sizing.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a configuration diagram for explaining a vegetation base material, a vegetation base, and a method of manufacturing the vegetation base material. In FIG. 1, reference numeral 1 denotes an apparatus for performing fine-graining while mixing a dewatered cake and a solidified material. A certain mixer, 2 is a dewatering cake supply device, 3 is a solidified material supply device, 4
Is a dewatering cake processing device. 5 is a filter press for dewatering sludge sent from a turbid water treatment facility (not shown) to produce a dewatered cake, 6 is a stock yard for storing the produced dewatered cake, and 7A is a solidified material A.
(For example, cement), 7B is solidifying material B
A silo 8 for storing (eg, lime) is a loading hopper for storing the dehydrated cake solidified by the mixer 1 and for supplying the solidified dehydrated cake to a transport truck. Reference numeral 10 denotes a transport line for re-granulating the dewatered cake that has been pulverized. The mixer 1 is provided with a processing speed control unit Cl for controlling the processing speed of the dewatered cake by controlling the rotation speed of a rotor provided in the mixer 1. Further, a solidification material supply amount control means C3 for controlling a mixing ratio of the solidification material A and the solidification material B and a supply amount of the solidification material is provided.

Next, a dewatered cake processing system having the above-described configuration will be described. At construction sites such as dams, turbid water generated by the production of aggregates (gravel, sand) during concrete casting, the operation of a batcher plant and foundation treatment, and the flooding of rough rocks are sent to turbid water treatment facilities. After being treated with a chemical or the like, it is sent to the filter press 5 and dewatered, and a dewatered cake is generated. The dewatered cake is temporarily stored in a dewatered cake stock yard 6 and then sent to a dewatered cake supply device 2 of a dewatered cake processing device 4 by a conveyor such as a belt conveyor by a predetermined processing amount. After the water content and the particle size are measured by the measuring device and the particle size distribution measuring device, the water content and the particle size are charged into the mixer 1 of the dehydrated cake supply device 2 at a predetermined charging speed. On the other hand, the solidified material A (for example, cement) stored in the silo 7A and the solidified material B (for example, lime) stored in the silo B are supplied by a predetermined amount of the solidified material of the dewatering cake supply device 2. Sent to device 3,
After being mixed at a ratio based on the measured moisture content and particle size of the dehydrated cake, the dehydrated cake is charged into the mixer 1 at a predetermined charging speed. As will be described later, the mixer 1 is provided with rotors 1A, 1B, which shred and pulverize the above-mentioned dewatered cake.
1C, and the finely divided dewatered cake is discharged from the mixer 1 to the hopper 8 in a state of being uniformly mixed with the solidified material. The strength of the solidified dewatered cake is determined by the solidification material A (for example, cement) and the solidification material B.
Although slightly different depending on the mixing conditions such as the mixing ratio with (for example, lime) and the processing speed of the mixer 1, when expressed by a cone index, it is about 0.4 MPa or more, and the strength is remarkably improved as compared with the dewatered cake before the processing. . The dewatered cake subjected to the granulation treatment is sent to a loading hopper 8 by a conveyor such as a belt conveyor in a predetermined amount, and then cured by the hopper 8 for a predetermined time (for example, 24 hours). For example,
After being supplied to the mixer 1 again from the dewatering cake supply device 2 via a belt conveyor), the mixture is refined. In this case, the supply of the dewatered cake before the granulation from the dewatered cake stockyard 6 is stopped, and the supply of the solidified material from the solidified material supply device 3 is stopped, and the granulation is performed again. .

Here, the configuration and operation of the mixer 1 will be described in detail. The mixer 1 is referred to as a multi-shaft vertical mixer, and as shown in FIG. 2A, is composed of a cylindrical rotary shaft 1a having a plurality of blades 1b at different angular positions on a side surface. Multiple rotors 1A, 1B, 1
C, and the dewatered cake fed from the material inlet at the top of the mixer 1 is shredded by the blades 1b into fine particles, and the solidified material fed from the material inlet and the fine particles are ground. The dehydrated cake is stirred and mixed to solidify the dehydrated cake. In this example, the process of granulating the dewatered cake by shredding is referred to as granulation. The above-mentioned blade part 1
b, as shown in FIG. 2 (a), a flat dehydrated cake cutting plate 1c is connected to the rotating shaft 1a via a rod-shaped support member 1d.
The rotary shaft 1a is mounted by a motor (not shown).
And by rotating the plurality of blades 1b,
As shown in FIG. 2 (b), the massive dewatered cake 9 is cut into fine pieces. Further, as shown in FIG. 1, the rotors 1A and 1B are arranged so as to face the upper part of the mixer 1, and the rotation direction is the rotors 1A and 1B.
The rotation directions are set opposite to each other so as to take in the dehydrated cake put in the gap. And the above rotor 1
A dehydration cake shredded and refined by the rotors 1A and 1B and mixed with the solidified material is further shredded and refined and mixed with the solidified material by the rotor 1C provided below the rotors A and 1B. Thereby, the dewatered cake and the solidified material can be uniformly mixed, and the processing speed is high, so that a large number of dewatered cakes can be refined.

As described above, the finely divided dewatered cake once mixed with the solidified material in the mixer 1 is again supplied from the hopper 8 to the mixer 1 via the transfer line 10 and then re-mixed. A fine graining process is performed. By re-granulating in this way, relatively small granules are obtained, as described later, and are supplied to the fertilizer mixer 11 to be mixed with the fertilizer to vegetate from the fertilizer mixer 11. A vegetation base material 12 most suitable for growing a plant to be grown is obtained. Next, the vegetation base material 12 composed of a dehydrated cake mixed with fertilizer is:
The plant may be transported as it is by a truck or the like and laid on a landscaping site or the like, and vegetation may be vegetated on a vegetation base in the landscaping obtained thereby. Further, the vegetation base material 15 may be formed by supplying the vegetation base material 12 to the pressure blowing device 13 shown in FIG. The pressure-feeding spraying device 13 converts the air from the air inlet 16, the vegetation base material 12 introduced from the introduction pipe 17, and the hydrophobic agent 19 introduced from the introduction pipe 18 from the outlet 20 at a relatively high speed. The hydrophobic agent 19 has a function of aggregating the vegetation base material blown out from the blowout port 20. The vegetation base material 12 composed of a mixture of the granulated dewatered cake and fertilizer introduced into the introduction pipe 17 is mixed with appropriate water to form a muddy material.
And blown out with the air. Alternatively, the dewatered cake that has been subjected to the refining process again may be blown under pressure by using a normal spraying plant apparatus (not shown) to form the vegetation base 15 at the vegetation site 14.

The vegetation base 15 can be formed by spraying the surface of the vegetation site 14 with a substantially uniform thickness using such a pressure blowing device 13. Plants can be planted. As the vegetation site 14, for example, a slope of cut and embankment generated by a collapsed slope development work or the like, a ground surface of a dune with extremely dryness, or a soft rock or a cohesive soil with little rock or soil, etc. Or an artificial part such as an inclined part of a structure such as a building, and any point may be used as long as it is a part to be greened. FIG. 4 is a characteristic diagram showing a case where a granular material obtained by granulation by the fine-granulating device shown in FIG. 1 is sieved. In FIG. 4, a characteristic curve 21 indicates a relationship between the dehydrated cake and the solidified material. The characteristic curve 22 shows the characteristics in the case where the fine-graining treatment of mixing into the mixer 1 while performing fine-graining is performed only once (first time), and the characteristic curve 22 is first finely-granulated using the transport line 10. This shows the characteristics when the dewatered cake obtained is again subjected to the granulation treatment by the mixer 1. In the characteristic curves 21 and 22, it is preferable that the particles of the dewatered cake that can be used in the pressure blowing device 13 are small enough to pass through a mesh having a sieve nominal size of about 20 mm or less. In the case of a small granular material, only a maximum of about 50% can be obtained in the characteristic curve 21 (only one time of fine-graining), but in the characteristic curve 22 (two times of fine-graining), a material having a sieve nominal size of about 20 mm and 90% or more can be obtained. Since it can be understood that the material passes through the sieve, it can be understood from this that the vegetation base material 12 including the small granular material that can be used for the pressure spraying device 13 can be obtained by performing the grain refining process twice. Understand.

Embodiment 2 FIG. 5 is a configuration diagram showing a vegetation base material and a method for manufacturing a vegetation base material and a vegetation base material according to the second embodiment of the present invention, and the same components as those in FIG. In the second embodiment, after the dehydrated cake stored in the hopper 8 is cured, for example, for one day, the dehydrated cake is supplied to the paddle mixer 24 via the transport line 23, and the dewatered cake is rotated based on the rotation of the paddle 25 of the paddle mixer 24. The dewatered cake is re-granulated in such a manner that the dewatered cake is lifted from the bottom while being sent in a certain direction, and is lifted. In the present example, the grain refinement by the paddle mixer 24 is referred to as grain sizing. FIGS. 6A and 6B schematically show the paddle mixer 24. The paddle 25 is formed by two parallel shafts 27 and 28 provided in the longitudinal direction of the gutter 26 of the paddle mixer 24. A plurality of arms 29 projecting from the outer circumference at regular intervals at 90 degrees from each other in the circumferential direction are attached at a predetermined angle (for example, 45 degrees). With the rotation of the shafts 27 and 28, the plurality of paddles 25 rotate, and the dewatered cake put into the gutter 26 of the paddle mixer 24 is unwound while being sent downstream, whereby the dewatered cake is finely sized.
The parallel shafts 27 and 28 are rotating in opposite directions so that the supplied dewatered cake is carried between the shafts 27 and 28. In this way, the vegetation base material 1 sized again by the paddle mixer 24 again
2 is supplied to the pressure blowing device 13 described in FIG. 3 and sprayed onto the vegetation site 14 to form a vegetation base 15. In this case, when the re-granulated dewatered cake was sieved, the characteristic curve 23 in FIG. 4 was selected. As can be understood from the characteristic curve 23, since the sieve having a nominal size of about 20 mm and about 90% or more passes through the sieve,
3 would be applicable.

Embodiment 3 FIG. 7 is a diagram showing an example of the third embodiment, in which the same components as those in FIG. In this case, the same rotors 1A, 1B,
A device 30 for performing the grain refining treatment provided with 1C is separately provided. In this device 30, the dewatered cake from the side of the mixer 1 placed in the hopper 8 is once cured, and then re-filled to be refined. It will be granulated. That is, the difference from FIG. 1 is that the dewatering cake is finely divided again by shredding the dewatered cake by separately providing a device 30 for finely granulating. Thus, even if the grain is refined twice using another apparatus 30, the same favorable result as in the case of FIG. 1 can be obtained.

In the present invention, the pressure blowing device 1
The size of the most preferable sieve size for No. 3 has been described as being a maximum of 20 mm, but this maximum value may vary depending on the processing speed of the pressure blowing device 13 and the size of the diameter of the outlet 20 as a matter of course. It is.

Although the mixing of the fertilizer has been described as providing the fertilizer mixer 11 separately and mixing with the dewatered cake, the fertilizer is put into the mixer 1 and the fertilizer is mixed with the dewatered cake using the mixer 1. Alternatively, the liquid containing fertilizer may be supplied to the pressure blowing device 13 and mixed with the dewatered cake by the pressure blowing device 13.

Although the dewatered cake has been described as being subjected to granulation treatment such as grain refining or sizing twice, the granulation treatment may be performed three or more times. Further, the granulation treatment such as fine-graining or sizing is not limited to the treatment using a mixer or a paddle mixer, but may be, of course, performed using another device.

Further, it has been found that the re-granulation treatment performed after the first granulation treatment is preferably performed after the dewatered cake subjected to the first granulation treatment is once cured for a certain period of time. . The curing time is set in consideration of the size of the granular material contained in the vegetation base material obtained by granulation.

The fertilizer mixed with the dewatered cake may be, for example, bark compost. However, various fertilizers may be used depending on the type of plant to be vegetated. Then, an optimal value may be set. In this case, peat moss may be used instead of bark compost, and the amount of the replacement is calculated by detecting the concentration of organic matter in the vegetation base material 12. As for the amount of the solidifying material such as cement and the amount of water supplied to the mixer 1 together with the dewatered cake, the magnitude of the soil hardness and the supporting strength of the vegetation base 15 itself formed by spraying are calculated. Of course, it is set by the thing. Also, the vegetation base material 12 may of course mix components such as earth and sand in addition to the dewatered cake and the solidified material.

It is conceivable that cement and lime as a solidifying material added to the dewatered cake are crushed and mixed at a weight ratio of 1: 1. Are set to various values in consideration of Also, the first granulation process has been described as being performed by the mixer 1, but this process may be performed by the paddle mixer 24.

[0024]

According to the first aspect of the present invention, the vegetation base material is formed by mixing fertilizer with the granular material of the dewatered cake obtained by mixing the dewatered cake and the solidified material. By layering on various vegetation sites such as a place for landscaping or bedrock, it is possible to plant and grow here, and it is necessary to secure land for embankment of dewatered cake as in the past. Without cost advantage.
In addition, since the vegetation base material is a granular material, it is advantageous in terms of transportation and handling.

According to the second aspect of the present invention, the fertilizer is mixed with the granular material of the dewatered cake obtained by mixing the dewatered cake and the solidified material such as cement, and the mixture is blown under pressure to the vegetation site to thereby form the vegetation base. Since the vegetation is formed, it is possible to easily form the vegetation base on an inclined portion such as a bedrock by the spraying.

According to the third aspect of the present invention, the dewatered cake is granulated while being mixed with the solidified material to obtain the granulated material of the dewatered cake. Therefore, the mixing process of the solidified material and the granulation process are performed simultaneously. And granulation can be performed efficiently.

According to the fourth aspect of the present invention, since the dewatered cake is re-granulated, it is possible to obtain a vegetation base material having a small particle size and suitable for a pressure blowing device.

According to the fifth aspect of the present invention, the granulation treatment for the first or second time is performed by using the device for shredding the dewatered cake, so that the granulation treatment can be performed with simple equipment.

According to the sixth aspect of the present invention, the first or second granulation treatment is performed by passing the dehydrated cake through a paddle mixer, so that the vegetation base material containing the granular material having a smaller particle size can be used. You can get it.

[Brief description of the drawings]

FIG. 1 is a simplified configuration diagram showing one embodiment of the present invention.

FIG. 2 is a simplified configuration diagram showing a main part of one embodiment of the present invention.

FIG. 3 is a diagram showing an example of a pressure blowing device used in one embodiment of the present invention.

FIG. 4 is a characteristic diagram for explaining a size of a granular material included in a vegetation base material according to one embodiment and another embodiment of the present invention.

FIG. 5 is a simplified configuration diagram showing another embodiment of the present invention.

FIG. 6 is a view schematically showing a paddle mixer used in another embodiment of the present invention.

FIG. 7 is a diagram showing another embodiment of the present invention.

[Explanation of symbols]

1 mixing machine, 2 dewatering cake supply device, 3 solidified material supply device, 8 hopper, 10, 23 transfer line, 11
Fertilizer mixer, 12 vegetation base material, 13 pumping spraying device, 14 vegetation site, 15 vegetation base, 24 paddle mixer.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Rikuo Matsuda 128-1 Kawaharaya, Yoshino-cho, Yoshino-gun, Nara Prefecture Inside the Kinaki Regional Construction Bureau Otaki Dam Construction Office (72) Inventor Takashi Oka Osaka-shi, Osaka 2-10-5 Katamachi, Miyakojima-ku, Kumagaya Gumi Osaka Branch (72) Inventor Masahiro Shoda 2-10-5 Katamachi, Miyakojima-ku, Osaka-shi, Osaka City F-term (reference) 2B022 AB02 BA01 BA13 BA14 BA15 BA16 BA18 BB01

Claims (6)

[Claims] 1. A fertilizer is mixed with a granular material of a dewatered cake obtained by mixing a dewatered cake formed by dehydrating turbid water generated by washing water of aggregate with a solidifying material such as cement. Vegetation base material. 2. A fertilizer is mixed with a granular material of a dewatered cake obtained by mixing a dewatered cake formed by dewatering turbid water generated by washing water of aggregates and a solidifying material such as cement. A vegetation base characterized in that the vegetation is sprayed under pressure. 3. A dewatered cake formed by dewatering turbid water generated by washing water of aggregate or the like, and granulating while mixing with a solidifying material such as cement to obtain a granular material of the dewatered cake. Item 4. The method for producing a vegetation base material according to Item 1. 4. The method for producing a vegetation base material according to claim 3, wherein the dewatered cake that has been granulated for the first time is re-granulated. 5. The method for producing a vegetation base material according to claim 4, wherein the granulation treatment for the first time or the second time is performed using a fine-granulation device for shredding the dewatered cake. 6. The method for producing a vegetation base material according to claim 4, wherein the first or second granulation treatment is carried out by passing the dehydrated cake through a paddle mixer and sizing.