KR101338712B1 - Preparation method of pavement block using wasted water sludge - Google Patents

Abstract

The present invention provides a method of manufacturing a pavement block using wasted water sludge and the method includes: a step of preparing a raw material by mixing a composite comprising 40 to 60 wt% waste water sludge powder, sand 5 to 20 wt%, clay 10 to 20 wt%, gypsum 10 to 20 wt%, iron 5 to 10 wt%, ash 1 to 2 wt%, fiber 5 to 10 wt% and calcium 1 to 2 wt%; a step of pressurization-forming the raw material by inserting the raw material into a press; and a step of sintering the formed material in a sintering furnace at temperature of 1100 to 1300°C for 12 to 36 hours and cooling the sintered material. [Reference numerals] (AA) Mixing raw materials (sludge, sand, clay, gypsum, iron, ash, fiber, calcium, and other additives);(BB) Pressurization-molding using a press;(CC) Drying pressurization-molded materials;(DD) Sintering the dried molded materials

Description

Manufacturing method of sidewalk block using sewage sludge {PREPARATION METHOD OF PAVEMENT BLOCK USING WASTED WATER SLUDGE}

The present invention relates to a method for manufacturing a sidewalk block using sewage sludge, and more particularly, to solve environmental problems by recycling sludge such as sewage and wastewater, and excellent in general properties including compressive strength, water absorption and water permeability. The present invention relates to a method for producing a sidewalk block and a sidewalk block manufactured by the same.

Economic development and improved living have caused pollution of drinking water sources, and the facilities of sewage treatment plants and wastewater treatment plants have been inevitably increased. Due to the increased sewage treatment plant and wastewater treatment plant, the amount of sewage and wastewater sludge generated during sewage and wastewater treatment is gradually increased, and its treatment is a serious environmental problem.

At present, the treatment of these sewage and wastewater sludges has been processed depending on landfilling, incineration after drying and ocean dumping. However, due to the reclamation of sewage and wastewater sludge, heavy metals and organic matter contained in the sludge cause heavy metal concentrations in the soil, groundwater contamination, various pathogens and odors, and during marine dumping, it is a major cause of marine pollution. Since 2013, marine dumping has been completely banned since 2013. In addition, since the moisture contained in the sludge exists in the bound or unbound water in the micropores of the solid or is surrounded by organic membranes, it is difficult to dry by a mechanical dehydration method. As it is expensive, the incineration method also uses a heat source, which is expensive as in the above heating and dehydration method, and causes secondary environment problems due to the scattering of ash or heavy metals.

The present invention has been made to solve the problems of the prior art as described above, the object is to solve the environmental problems by recycling the sludge such as sewage and wastewater, including compressive strength, water absorption and water permeability aspects To provide excellent sidewalk block in physical properties.

The technical problem of the present invention as described above is achieved by the following means.

(1) 40 to 60% by weight of sewage sludge powder, 5 to 20% by weight of sand, 10 to 20% by weight of clay, 10 to 20% by weight of gypsum, 5 to 10% by weight of iron, 1 to 2% by weight of ash, 5 to 5% of fiber Preparing a raw material by mixing a composition composed of 10 wt% and 1-2 wt% of calcium;

Putting the mixed raw materials into a press and press molding into a press block shape;

Calcining and cooling the molded material for 12 to 36 hours in a firing furnace at 1,100 to 1,300 ° C.

(2) The method according to claim 1,

Method of producing a sidewalk block, characterized in that the step of further drying for 1 to 2 hours at 60 ~ 80 ℃ in the drying room after the pressure molding.

(3) The method according to claim 1,

Method for producing a sidewalk block, characterized in that the bottom ash is added to the bottom ash 5-10% by weight.

(4) The method according to 1 or 2,

5 to 10% by weight of volcanic stone and 2 to 5% by weight of zeolite, the production method of the sidewalk block.

(5) The method according to claim 1 or 2,

The firing and cooling process is repeated 2 to 3 times, the cooling method of producing a sidewalk block, characterized in that performed using nitrogen.

(6) A sidewalk block produced by the method of paragraph 1.

According to the present invention as described above, while solving the environmental problems by recycling the sludge, such as sewage and wastewater, it provides an excellent sidewalk block in the overall physical properties including aspects of compressive strength, water absorption and permeability.

1 is a manufacturing process diagram of the sidewalk block of the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the present invention, after the wastewater sludge is collected from the wastewater sludge of the dehydrated cake state having a water content of 80% or more in a sewage treatment plant or industrial wastewater treatment plant, the wastewater sludge cake is first dried at about 100 to 120 ° C. for 24 to 36 hours, and The first dried sewage sludge is pulverized with a pulverizer to be used.

In the present invention, 40 to 60% by weight of the pulverized sewage sludge powder, 5 to 20% by weight of sand, 10 to 20% by weight of clay, 10 to 20% by weight of gypsum, 5 to 10% by weight of iron, 1 to 2% by weight of ash, A composition composed of 5 to 10% by weight of fibers and 1 to 2% by weight of calcium is mixed and placed in a press having a predetermined shape and pressure molded.

Preferably, 5-10% by weight of bottom ash is added to replace a part of sand together with the sludge powder in the composition of the mixture. By adding bottom ash, it is possible to further improve heat resistance and compressive strength and reduce weight.

More preferably, by adding a predetermined amount of volcanic stone and zeolite in the composition of the mixture, it is possible to further improve overall physical properties. For this purpose, the volcanic stone can be used in the range of 5 to 10% by weight, and zeolite is preferably added in the range of 2 to 5% by weight. Care should be taken because it is difficult to expect, as well as the physical property will fall due to excessive addition.

The material molded by the above process is preferably dried for 1 to 2 hours at 60 ~ 80 ℃ in a drying chamber, the dried material is preferably fired for 12 to 36 hours in a firing furnace of 1,100 ~ 1,300 ℃, Cooling process

The firing and cooling process is preferably performed by repeating about 2 to 3 times, in which case it is preferable to cool by using nitrogen in order to perform the process quickly to increase the amount of production.

The drying conditions are important in raising and maintaining the density of the tissue and the strength of the product, and if the conditions are out of these conditions, the function may be remarkably deteriorated to be used as a sidewalk block due to deterioration of physical properties.

As described above, in the present invention, a material obtained by powdering sludge of wastewater is mixed with sand, clay, gypsum, iron, ash, fiber, calcium, and other additives, and the material obtained by sintering is applied to conventional cement. Compared to the conventional sidewalk block obtained by applying the conventional cement in terms of permeability and water absorption, the compressive strength is high due to the strong binding force between the components, and can be used as a sidewalk block having various uses.

The composition ratio of each component is important in terms of the overall physical properties required as the sidewalk block, and if excessive or insufficient in the content thereof, the compressive strength is lowered, the permeability and the water absorption are lowered, and its function is desired. Since there is a possibility that it cannot be satisfied, it is preferable to maintain the composition ratio between the components.

Hereinafter, the present invention will be described in more detail with reference to Examples. It is to be understood, however, that these examples are provided so that the scope of the present invention is not limited thereto.

Example 1

According to the procedure shown in FIG. 1, 60% by weight of sewage sludge powder, 8% by weight of sand, 10% by weight of clay, 10% by weight of gypsum, 5% by weight of ash, 1% by weight of ash, 5% by weight of fiber, 1% by weight of calcium The composition consisting of a mixture was put into a press having a predetermined shape and pressure molded.

The molded material was dried at 80 ° C. for 1 hour in a drying room, and then the dried material was calcined at 1,200 ° C. for 24 hours and cooled to prepare a sidewalk block. Instead of the sewage sludge powder, a substitute of ordinary cement was used as a comparative example.

[Example 2]

Sewage sludge powder 40%, sand 18%, clay 20%, gypsum 10%, iron 5%, ash 1%, fiber 5%, calcium 1% by weight It is put into a press having a shape and press-molded.

The molded material was dried at 80 ° C. for 1 hour in a drying room, and then the dried material was calcined at 1,200 ° C. for 24 hours and cooled to prepare a sidewalk block.

[Example 3]

Composition consisting of 40% by weight sewage sludge powder, 10% by weight bottom ash, 8% by weight sand, 20% by weight clay, 10% by weight gypsum, 5% by weight iron, 1% by weight ash, 5% by weight fiber, 1% by weight calcium The mixture is put into a press having a predetermined shape and press-molded.

The molded material was dried at 80 ° C. for 1 hour in a drying room, and then the dried material was calcined at 1,200 ° C. for 24 hours and cooled to prepare a sidewalk block.

Example 4

Composition consisting of 40% by weight sewage sludge powder, 5% by weight bottom ash, 13% by weight sand, 20% by weight clay, 10% by weight gypsum, 5% by weight iron, 1% by weight ash, 5% by weight fiber, 1% by weight calcium The mixture is put into a press having a predetermined shape and press-molded.

The molded material was dried at 80 ° C. for 1 hour in a drying room, and then the dried material was calcined at 1,200 ° C. for 24 hours and cooled to prepare a sidewalk block.

[Example 5]

Sewage water sludge powder 40% by weight, bottom ash 5% by weight, sand 13% by weight, clay 10% by weight, volcanic stone 5% by weight, zeolite 5% by weight, gypsum 10% by weight, iron 5% by weight, ash 1% by weight, fiber 5 The composition consisting of weight% and calcium 1% by weight is mixed, put into a press having a predetermined shape, and pressure molded.

The molded material was dried at 80 ° C. for 1 hour in a drying room, and then the dried material was calcined at 1,200 ° C. for 24 hours and cooled to prepare a sidewalk block.

Experimental Example 1 Compressive Strength

Compressive strength was measured for the sidewalk blocks manufactured through the above examples. The compressive strength was used by the hydraulic servo material tester (UTM), and the experiment was carried out by putting the manufactured block on the measuring equipment and maintaining the load control valve constant and stopping the highest peak value when the block was broken. Measured.

Sample Compressive strength (N / ㎡) Example 1 1500 Example 2 1500 Example 3 1600 Example 4 1650 Example 5 1700 Comparative Example 800

As shown in Table 1, the sidewalk block according to the present invention appeared to be higher than the comparative example, it can be confirmed that it is very suitable as a sidewalk block because the phenomenon does not crack or break.

Experimental Example 2 Permeability

Permeability was measured for the sidewalk blocks manufactured through the above examples.

The permeability was produced by fixing the frame of 5cm × 5cm × 6cm and attaching the two sidewalk blocks manufactured through the firing process to each other to fix the bottom of the frame to measure the permeability. Permeability was measured by measuring the amount of water permeated through the press block for 10 minutes in 500ml of water, the amount of water permeated was measured using a measuring cylinder.

Sample Permeability (ml / min) Example 1 13.1 Example 2 13.2 Example 3 15.5 Example 4 15.8 Example 5 17.5 Comparative Example 5.3

As shown in Table 2, in the case of the sidewalk block according to the present invention can be confirmed that the water permeability is superior to the comparative example is particularly useful in the manufacture of a water-permeable block.

Experimental Example 3 Absorption Rate

Absorption was measured for the sidewalk blocks prepared through the above examples.

Absorption rate was measured in a desiccator, dried in an air bath for 24 hours at 105 ± 10 ℃ in a dryer, measured the dry weight (m ₁ ) and then measured the distance between the top of the specimen and the water surface. It was 60 mm and it was left to stand in water of 20 +/- 5 degreeC for 24 hours. The specimen was removed from the water and quickly wiped off the surface moisture with a cloth, and then the weight of the specimen was measured (m ₂ ) to calculate the absorption rate according to the following equation.

Sample Absorption Rate (%) Example 1 31.1 Example 2 31.3 Example 3 32.5 Example 4 34.2 Example 5 35.6 Comparative Example 21.6

As shown in Table 3, the sidewalk block according to the present invention can confirm that the absorption rate is superior to the comparative example, it can be seen that it can be used for various purposes of the sidewalk block.

In the present invention, the sidewalk block is described, but the present invention is not limited thereto, and the same can be applied to the braille block.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims. It can be understood that

Claims (6)

40 to 60% by weight of sewage sludge powder, 5 to 20% by weight of sand, 10 to 20% by weight of clay, 10 to 20% by weight of gypsum, 5 to 10% by weight of ash, 1 to 2% by weight of ash, 5 to 10% by weight of fiber Preparing a raw material by mixing the composition consisting of 1 to 2% by weight of calcium;
Putting the mixed raw materials into a press and pressing-molded into a press block shape;
Calcining and cooling the molded material for 12 to 36 hours in a firing furnace at 1,100 to 1,300 ° C. The method of claim 1,
Method of producing a sidewalk block, characterized in that the step of further drying for 1 to 2 hours at 60 ~ 80 ℃ in the drying room after the pressure molding. delete delete 3. The method according to claim 1 or 2,
The firing and cooling process is repeated 2 to 3 times, the cooling method of producing a sidewalk block, characterized in that performed using nitrogen. Sidewalk block produced by the method of claim 1.

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