JP3203284B2 - Concrete molded article, method for producing the same, and use of the molded article - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete molding, a method for producing the same and a use of the molding.

[0002]

2. Description of the Related Art Conventionally, a porous lightweight cellular concrete (hereinafter, referred to as ALC) molded product obtained by semi-curing a lightweight cellular concrete raw material slurry and curing it at a high temperature and a high pressure has a specific shape and a predetermined size. A method for producing a water treatment material by cutting and processing is known (Japanese Patent Application Laid-Open No. 3-275194).

[0003]

When the above-mentioned water treatment material is brought into contact with sewage, microorganisms inhabit the water treatment material.
It is known to purify sewage water by the action of the microorganisms, and when phosphorus is contained in the sewage water, the phosphorus is captured by the water treatment material to exert a dephosphorization action.

[0004] However, the water treatment material obtained by the above method has the following problems. (1) Since the water treatment material is lightweight and has a low water absorption rate, when the water treatment material is put into a sewage treatment tank already filled with sewage or a water channel or a river contaminated with domestic wastewater, the treatment material is as described above. It floats on the sewage in the sewage tank and the upper layer of the domestic wastewater. (2) When the water treatment material floats on the upper layer, the contact efficiency with wastewater or wastewater is reduced, and the original water treatment effect of the water treatment material cannot be sufficiently exhibited. (3) When the water treatment material is filled in the tank filled with water, the water treatment material floats and cannot be filled with a predetermined amount of the water treatment material. (4) Further, in waterways and rivers, the water treatment material flows out while floating. Therefore, it is necessary to stop the water treatment material at a predetermined place and make it contact with the drainage flowing down. Therefore, an object of the present invention is to provide a lightweight aerated concrete-based water treatment material that does not float even when put into a sewage treatment tank or into a waterway or river.

[0005]

According to a first aspect of the present invention, there is provided a concrete molded product formed by solidifying granules made of porous lightweight cellular concrete with a joining material and forming a shape. And The invention of claim 2 is
In order to obtain the above-mentioned molded product, a water slurry of an uncultivated organism obtained by semi-curing the lightweight cellular concrete raw material slurry, and a granule made of porous lightweight cellular concrete are mixed to obtain a non-fluid once. Means is employed in which a molded body from the non-fluid is subjected to high temperature and high pressure steam curing. The invention of claim 3 is intended to exhibit water immersion even when the bulk specific gravity of the molded article is 1 or less, and to utilize the molded article for the intended use of a water treatment material intended by the present invention.

[0006]

The following effects are exhibited in the present invention. According to the first aspect of the present invention, at the same time as the particles are joined with the joining material, a space is formed between the particles. According to the third aspect of the present invention, when this molded body is used as a water treatment material, the water treatment material naturally comes into contact with the sewage. Once the mass of water treatment material once floats is immersed downward, the chance of contact with water increases.

In the invention of claim 2, first, a water slurry of uncultivated organisms obtained by semi-hardening a raw material slurry of lightweight cellular concrete and a granular material made of porous lightweight cellular concrete are mixed, and then a non-fluidized material is mixed. Therefore, uncultivated organisms adhere to the peripheral surface of the granular material in the non-fluid. Next, when the non-fluid is formed, the uncultivated organism acts to maintain the whole granular material in a predetermined shape. When the molded body obtained in this way is cured with high temperature and high pressure steam,
The uncultivated organism becomes chemically equivalent to the granular material, and acts to join the granular materials.

[0008]

Embodiment 1 Next, an embodiment of the present invention will be described with reference to the drawings. First, two kinds of raw materials are prepared. About 60 parts by weight of siliceous raw material, about 15 parts by weight of calcareous raw material,
A water slurry composed of a lightweight cellular concrete raw material comprising about 20 parts by weight of cement and about 5 parts by weight of gypsum and a small amount of aluminum powder was semi-cured to obtain an uncultivated organism. About 30 parts by weight of water was mixed with 100 parts by weight of the uncultivated organism to obtain a water slurry of the uncultivated organism.

On the other hand, granules obtained by pulverizing ALC obtained by a well-known method and passing through a sieve having a mesh interval of 5 mm (thus including powder) were prepared. Next, about 100 parts by weight of the granular material was mixed with 100 parts by weight of the water slurry of the uncultivated organism to prepare a non-fluid.

A non-fluid material is filled in a cylindrical form having an inner diameter of 5 cm and a core having a diameter of 2 cm provided at the center of the form, and pressure is applied from above and below to form a ring-shaped molded body. I got This compact is placed in an autoclave and
Steam curing was carried out at a temperature of 10 ° C. and a pressure of 10 atm for 5 hours (the invention of claim 2).

The molded body 1 obtained as shown in FIG. 1 has a hollow cylindrical shape, and when a part of its surface is observed, FIG.
As shown in (1), the granular bodies 2 in the molded body 1 are solidified in a horizontal shape, and a space 4 is formed in a portion where the granular bodies 2 are not joined to each other.
Invention).

The absolute dryness specific gravity of a portion of the molded body 1 excluding the hollow portion 3 occupied by the core was about 0.7.

[0013] The water absorption test of the hollow cylindrical molded body 1 thus obtained having an outer diameter of 50 mm, an inner diameter of 25 mm and a height of 50 mm was performed as follows. First, the molded body 1 is
It was left in a constant temperature room at 05 ° C. for about 48 hours to make it completely dry.
The molded body 1 was placed in a water tank filled with purified water, and the amount of water absorption was measured over time. As a result, a result shown by a curve a in FIG. 3 was obtained. The molded body 1 was immersed in purified water several seconds after being put into the water tank.

[0014]

COMPARATIVE EXAMPLE For comparison, a water absorption test was carried out on the molded article obtained by the above-mentioned prior art according to the same manner as in Example 1.
And the result shown by the curve b of FIG. 3 was obtained. This molded product did not completely submerge in water even though 10 minutes had passed after it was put into the water tank.

As is apparent from the curves a and b, the molded article of Example 1 according to the present invention not only has a high water absorption rate but also has a very short immersion time in water as compared with that of the prior art. I understand.

[0016]

Example 2 An experiment on the treatment of swine urine sewage was performed using the sewage treatment apparatus 10 shown in FIG. The sewage treatment apparatus 10 is basically a rectangular primary treatment tank 11 of 200 mm × 150 mm × 310 mm, and a 200 mm × 150 mm × 290 for successively treating the sewage treated in the treatment tank 11.
mm of the secondary treatment tank 12. Each of the treatment tanks 11 and 12 was provided with aeration tubes 13 and 14 capable of supplying air of 500 mm liter / min into the sewage. The sewage is supplied from the first supply pipe 15 at a flow rate of 10 liters / day to the lower part of the primary treatment tank 11, from which the primary treated water overflows, and then the second supply pipe The treatment water is supplied below the second treatment tank 12 through 16, and is finally treated in the second treatment tank 12 in the same manner as described above and discharged to the outside through the discharge pipe 17.

Each of the treatment tanks is filled with a large number of compacts manufactured in Example 1 so as to occupy about 90% of the volume of the wastewater in each treatment tank as the water treatment material 18. It had been. When the water treatment material 18 was put into a treatment tank filled with sewage, the water treatment material immediately submerged and settled downward. In this experiment, the first treatment tank 1
PH of sewage supplied from the first supply pipe 15 with respect to 1,
The BOD and the total phosphorus concentration (TP) were measured, and at the same time, the same characteristics of the treated water discharged from the discharge pipe of the secondary treatment device 12 were measured. The results are shown in the table.

[0018]

【table】

[0019]

Comparative Example 2 The same experiment as in Example 3 was conducted using the water treatment material of the prior art. When the conventional water treatment material was put into the treatment tank, the treatment material did not readily sink, so the water treatment material was forcibly filled not only below the sewage surface but also into the space above the sewage surface. Therefore, more water treatment materials were required than in the case of Example 3. The results of this experiment are also shown in the above table.

As is evident from the above table, the wastewater treatment performance of Example 3 is not only better than the prior art but also requires less water treatment material.

The present invention can be carried out by partially modifying the above-described embodiments as long as the effects of the present invention are not significantly impaired following the fundamental technical idea. For example, cement may be added to the uncultivated organism to develop the strength of the molded body before curing, or a thickener such as methyl cellulose may be added to adjust the viscosity. Part of the lightweight cellular concrete granules can be replaced with activated carbon, zeolite, or the like.

In order to adjust the porosity of the compact, the mixing ratio of the two raw materials can be changed. For example, in order to increase the porosity, the mixing ratio of the uncultivated organism can be made lower than the value of the embodiment. Conversely, the mixing ratio of uncultivated organisms can be increased in order to increase the strength of the molded body. The granules of the present invention can also utilize crushed ALC generated during the ALC manufacturing process or the construction of an ALC building.

[0023]

As described above in detail, when the molded article according to the present invention is used as a water treatment material, the molded article is immersed in the water treatment tank without floating on the upper layer. Therefore, the water treatment material according to the present invention exhibits an excellent effect that the contact efficiency with wastewater can be enhanced, and thus the water treatment efficiency can be enhanced. The invention also provides an optimal method for producing the above-mentioned molded body.

[Brief description of the drawings]

FIG. 1 is a perspective view of a molded body manufactured in an example according to the present invention.

FIG. 2 is a partially enlarged view showing a part of FIG. 1 in an enlarged manner.

FIG. 3 is a diagram showing water absorption characteristics of a water treatment material.

FIG. 4 is a schematic view of a water treatment apparatus according to a third embodiment.

[Explanation of symbols] 1 molded body 2 granular body 3 hollow part 4 space part

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-5-200393 (JP, A) JP-B-63-27311 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 3/02-3/10 C04B 38/00-38/10

Claims (3)

(57) [Claims] 1. A concrete molded article obtained by solidifying granules made of porous lightweight cellular concrete with a joining material and forming the same. 2. A non-cultivated water slurry obtained by semi-hardening a lightweight cellular concrete raw material slurry, and a granular material composed of porous lightweight cellular concrete are mixed to obtain a non-fluid material once. A method for producing a concrete-based molded body, comprising subjecting a molded body from a fluid to high-temperature and high-pressure steam curing. 3. A water immersion material having an absolute dryness specific gravity of 1 or less, wherein a granular material made of porous lightweight cellular concrete is solidified with a joining material and formed into an oval shape.