KR101236862B1 - Soil Conditioner manufacturing method utilizing sewage sludge - Google Patents

Abstract

The present invention relates to a method for manufacturing a land reformer using sewage sludge, the purpose of which is a land reformer that can be utilized as a cover material and a base soil material in a landfill facility by utilizing sewage sludge that is disposed of by-products and landfills and dumping at sea. In order to recycle waste resources more efficiently.
According to the land improvement agent manufacturing method using sewage sludge according to the present invention for this purpose; Using the pressurized fluidized bed combustion technology of the cogeneration plant, the furnace pressure is about 6-15 atm and the combustion temperature is 800-1200 ℃. The coal is supplied to the combustion furnace filled with layer material (sand, ash) and injected through the dispersion plate. Desulfurizer (limestone) is injected directly into the combustion furnace in the way of combustion by air which has been burned, and desulfurization during combustion is performed. The first mixing step (S1) of manufacturing a solid agent 30 by mixing the coal ash (10) and the papermaking combustion material (20) having a CaO content of 40 to 45% by weight after the combustion of paper sludge in a certain weight part ; A mixture of 300 to 500 MESH of silica sand powder (40), dilute sulfuric acid (50) having a sulfuric acid concentration of 85 to 90%, and dolomite (60) consisting of calcium magnesium carbonate [CaMg (CO3) 2] are mixed in a predetermined weight part. Secondary mixing step (S2) to prepare a pH regulator 70; Mixing the solid agent 30 prepared in the first mixing step (S1) and the pH adjuster 70 prepared in the second mixing step (S2) in a predetermined weight part to the sewage sludge 80 of the water content 75 ~ 85%. Reaction step (S3) to react with the water of the sewage sludge; Reaction heat (S3) of the mixture passed through the reaction heat and water vapor, and the curing step (S4) for producing a land-improving agent 90 of the same form as the soil, the land-improving agent (80) thus prepared is pH and Ammonia gas is stabilized, and mixed with soil, has the advantage that can be utilized as cover soil or base soil in landfill facilities.
Conventional sewage sludge (80) treatment method is solidifying treatment by mixing the solidifying agent composed of quicklime, hard calcinal dolomite, and combustion ash to sewage sludge, but the solidified material has a pH of 12.5 or more due to the strong alkaline properties of the solidifying agent This is close to designated wastes (waste material containing substances designated and notified by the Minister of Environment as harmful substances that may contaminate the main conversion scene), and solidified products generate a large amount of ammonia gas due to the rise in pH. It is a fact that it is not utilized as cover soil and land improvement system by
In addition, quicklime and light mineral dolomite, which are the main components of the existing solidifying agent, are manufactured using high temperature heat source of minerals collected by damaging nature in narrow land, and cause primary environmental damage when collecting raw materials, Has a problem of causing secondary environmental pollution due to the generation of CO2, and due to the prolonged foot-and-mouth disease, a large amount is used at landfill, and the price has more than doubled due to the shortage of stock, and even the shortage of stock The reality is that each company is having a lot of difficulty in purchasing the quantity.
Therefore, the present invention is a solid agent (30) consisting of a coal ash (10) of 55 to 65% by weight CaO content and a papermaking combustion material (20) of 40 to 45% by weight of CaO content and a pH reduction and By using sewage sludge (80) with pH and ammonia gas stabilized land improver (90) using a pH adjuster (70) capable of suppressing ammonia gas generation, it is possible to use as a cover material and a base soil in landfill facilities without complaints. In addition, by replacing the scarce resources with by-products generated at the workplace, it has the advantage of minimizing the secondary environmental damage and environmental pollution due to resource collection and processing.

Description

Soil Conditioner manufacturing method utilizing sewage sludge

The present invention relates to a method for manufacturing a land reformer using sewage sludge, the purpose of which is a land reformer that can be utilized as a cover material and a base soil material in a landfill facility by utilizing sewage sludge that is disposed of by-products and landfills and dumping at sea. In order to recycle waste resources more efficiently.

According to the land improvement agent manufacturing method using sewage sludge according to the present invention for this purpose; Using the pressurized fluidized bed combustion technology of cogeneration plant, the furnace pressure is about 6-15 atm, the combustion temperature is 800-1200 degrees Celsius, and coal is supplied to the combustion furnace filled with layer material (sand, ash) and injected through the dispersion plate. Desulfurizer (limestone) is injected directly into the combustion furnace in the way of combustion by the air which has been burned and desulfurization during combustion, and the fuel is burned to use heat for cogeneration, and the remaining CaO content of the residue after the combustion is 55 to 65 weight The first mixing step (S1) of manufacturing a solid agent 30 by mixing the coal ash (10) and the papermaking combustion material (20) having a CaO content of 40 to 45% by weight after the combustion of paper sludge in a certain weight part ; A mixture of 300 to 500 MESH of silica sand powder (40), dilute sulfuric acid (50) having a sulfuric acid concentration of 85 to 90%, and dolomite (60) consisting of calcium magnesium carbonate [CaMg (CO3) 2] are mixed in a predetermined weight part. Secondary mixing step (S2) to prepare a pH regulator 70; Mixing the solid agent 30 prepared in the first mixing step (S1) and the pH adjuster 70 prepared in the second mixing step (S2) in a predetermined weight part to the sewage sludge 80 of the water content 75 ~ 85%. Reaction step (S3) to react with the water of the sewage sludge; Reaction heat (S3) of the mixture passed through the reaction heat and water vapor, and the curing step (S4) for producing a land-improving agent 90 of the same form as the soil, the land-improving agent (80) thus prepared is pH and Since ammonia gas is stabilized and mixed with general soil, it has the advantage that it can be utilized as cover soil or basic soil in landfill facilities.

Conventional sewage sludge (80) treatment method is solidifying treatment by mixing the solidifying agent composed of quicklime, hard calcinal dolomite, and combustion ash to sewage sludge, but the solidified material has a pH of 12.5 or more due to the strong alkaline properties of the solidifying agent It is close to the designated waste, and the solidified material is generated a large amount of ammonia gas due to the rise in pH, and the reality is that it cannot be utilized as a cover material and land improvement agent by civil complaints.

        In addition, quicklime and light mineral dolomite, which are the main components of the existing solidifying agent, are manufactured using high temperature heat source of minerals collected by damaging nature in narrow land, and cause primary environmental damage when collecting raw materials, Has a problem of causing secondary environmental pollution due to the generation of CO2, and due to the prolonged foot-and-mouth disease, a large amount is used at landfill, and the price has more than doubled due to the shortage of stock, and even the shortage of stock The reality is that each company is having a lot of difficulty in purchasing the quantity.

       The present invention is a solid agent (30) consisting of a coal ash (10) having a CaO content of 55 ~ 65% by weight and a papermaking combustion material (20) having a 40% to 45% CaO content of the by-product generated from the workplace and pH reduction and ammonia By using the pH adjuster 70 that can suppress the generation of gas, the sewage sludge 80 is manufactured as a land improver 90 stabilized with pH and ammonia gas, thereby making the best use as a cover material and an underlying soil material in a landfill without civil complaints. In addition, by replacing the scarce resources with by-products generated at the workplace, it has the advantage of minimizing secondary environmental damage and environmental pollution due to resource collection and processing.

        The present invention for achieving this object is specifically,

        In the land improvement agent manufacturing method using sewage sludge,

The fuel is burned in the cogeneration plant, and the heat is used for cogeneration, and the coal residue 10, which is the residue remaining after the combustion, and the papermaking combustion material 20 having a CaO content of 40 to 45 wt% after the paper sludge combustion are fixed. The first mixing step (S1) for producing a solid 30 by mixing in parts by weight;

        A mixture of 300 to 500 MESH of silica sand powder (40), dilute sulfuric acid (50) having a sulfuric acid concentration of 85 to 90%, and dolomite (60) composed of calcium magnesium carbonate [CaMg (CO3) 2] are mixed at a predetermined weight part. Secondary mixing step (S2) to prepare a pH regulator 70;

        Mixing the solid agent 30 prepared in the first mixing step (S1) and the pH adjuster 70 prepared in the second mixing step (S2) in a predetermined weight part to the sewage sludge 80 of the water content 75 ~ 85%. Reaction step (S3) to react with the water of the sewage sludge;

        It characterized in that it comprises a curing step (S4) for removing the heat of reaction and steam of the mixture passed through the reaction step (S3) to produce a land modifier (90) of the same form as the soil,

In the first mixing step (S1), 20 to 40: 80 to 60 parts by weight of a coal ash 10 having a CaO content of 55 to 65% by weight and a papermaking combustion material 20 having a CaO content of 40 to 45% by weight are mixed. Characterized in that

        The secondary mixing step (S2) is characterized in that the silica sand powder 40, dilute sulfuric acid (50) and dolomite (60) is mixed in 70: 20 ~ 25: 5 parts by weight,

        The reaction step (S3) is the sewage sludge 80 of the water content 75 ~ 85%, the solidifying agent 30 of the first mixing step (S1) and the pH adjuster 70 of the second mixing step (S2) 100 : 35 to 40: 10 parts by weight of the mixture, characterized in that

        The coal ash 10 of the first mixing step (S1) is a pressure of the fluidized bed of the cogeneration plant using a pressurized fluidized bed combustion technology, the furnace pressure is about 6-15 atm, the combustion temperature is 800-1200 degrees Celsius, the layer material (sand, ash) is It supplies coal to the packed combustion furnace and burns the desulfurizer (limestone) directly into the furnace in the way that it is burned by the air injected through the dispersion plate to desulfurize during combustion, and burns fuel to use heat for cogeneration. After the combustion is finished, the remaining CaO content is 55 ~ 65% by weight, characterized in that strongly alkaline powder of pH 11.8 ~ 12.5,

        The papermaking combustion material 20 of the first mixing step (S1) dehydrates the sediment produced during papermaking wastewater treatment, and the dehydrated sediment is burned at 900 to 1000 ° C. by using a combustion device, thereby producing a CaO content of 40. Characterized in that it is a strong alkaline powder of pH 12.1 ~ 12.5 to ~ 45% by weight,

        The silica fine powder 40 of the second mixing step (S2) is characterized in that the fine powder of 300 ~ 500 MESH collected dust generated during the grinding process of silica sand,

Equal material of the silica fine powder 40 of the second mixing step (S2) is characterized in that the powder is a pulverized diatomaceous earth to 200 ~ 300 MESH dried to less than 10% moisture content having a SiO 2 structure and chemical composition as a basic unit ,

        As the equivalent material of the dolomite 60 in the second mixing step (S2), calcium carbonate (CaCO3) and magnesium carbonate (MgCO3) having the structure and chemical composition of the carbonate (CO32-) as basic units are 200 to 325 MESH. Characterized in that the powder is crushed,

        Regarding the land reformer manufacturing method using sewage sludge, characterized in that the land reforming agent 90 and the general soil produced by the curing step (S4) is mixed to 50 ~ 100: 100 parts by weight to use as a cover soil or a base soil material will be.

As described in detail above

The present invention is a solid (30) and pH reduction and ammonia composed of a coal ash (10) of 55 to 65% by weight CaO content and a paper-burning combustion material (20) of 40 to 45% by weight CaO content by-product generated at the workplace By using the pH adjuster 70 that can suppress the generation of gas, the sewage sludge 80 is manufactured as a land improver 90 stabilized with pH and ammonia gas, thereby making the best use as a cover material and an underlying soil material in a landfill facility without complaints. In addition, by replacing the scarce resources with by-products generated at the workplace, it has the advantage of minimizing secondary environmental damage and environmental pollution due to resource collection and processing.

More specifically, by using a pressurized fluidized bed combustion technology in a cogeneration plant, the furnace pressure is about 6-15 atm, the combustion temperature is 800-1200 degrees Celsius, and coal is supplied to and distributed in a furnace filled with layer material (sand, ash). Desulfurizer (limestone) is injected directly into the furnace in the way that it is combusted by the air injected through the plate to desulfurize during combustion, and the fuel is burned to use heat for cogeneration, and the remaining CaO content is Dehydration of the coal ash (10) of 55 to 65% by weight and the sediment generated during the paper wastewater treatment of the paper mill, the CaO content generated after burning the dehydrated precipitate at 900 ~ 1000 ℃ 40 to 45% by weight of pH 12.1 A solid alkaline powder (30) was prepared by mixing the paper-based combustion material (20), which is a strong alkaline powder of ˜12.5, to replace the expensive calcined lime having an CaO content of 85% by weight and light dolomite having a CaO content of 45 to 50%. By lack It is possible to prevent the waste of resources, and also quicklime and light mineral dolomite are manufactured by using high temperature heat source of minerals collected by damaging nature in narrow country. Has the advantage of minimizing secondary environmental pollution by CO2.

In addition, the solidified material treated in the conventional method for treating sewage sludge 80 has a pH near 12.5 or higher due to the strong alkalinity of the solidifying agent, and the solidified material has a large amount of ammonia gas due to the pH increase. It has been generated, and currently cannot be used as a cover material and land improver by the civil complaint, but this is produced by the pH regulator 70 of pH 1 ~ 1.5, by reducing the pH and ammonia gas stabilized land improver (90), It is possible to eliminate the cause of the occurrence, and thus can be utilized as a landfill material and landfill material in the landfill facility to the maximum has the advantage of more efficiently treating a large amount of sewage sludge (80).

1 is a block diagram showing a process of a land improvement agent manufacturing method using sewage sludge according to the present invention,
Figure 2 shows the components of the mixture according to the mixing step according to the present invention,
3 is a step-by-step embodiment according to the present invention,
4 is a land improver 90 made in accordance with the present invention.

        In the following description of the drawings in accordance with the present invention

1 is a block diagram showing a process of a land improvement agent manufacturing method using sewage sludge according to the present invention,

Figure 2 shows the components of the mixture according to the mixing step according to the present invention,

3 is a step-by-step embodiment according to the present invention,

4 is a land improver 90 made in accordance with the present invention.

Hereinafter, one preferred embodiment according to the present invention will be described in detail with reference to the accompanying drawings.

Land improvement agent manufacturing method using the sewage sludge according to the present invention;

As shown in FIG. 1,

Using the pressurized fluidized bed combustion technology of cogeneration plant, the furnace pressure is about 6-15 atm, the combustion temperature is 800-1200 degrees Celsius, and coal is supplied to the combustion furnace filled with layer material (sand, ash) and injected through the dispersion plate. Desulfurizer (limestone) is injected directly into the combustion furnace in the way of combustion by air which has been burned, and desulfurization during combustion is performed. Dehydration of coal ash (10), a strong alkaline powder of pH 11.8 ~ 12.5, and sediment produced during paper wastewater treatment at a paper mill, and the CaO content generated after burning the dehydrated sediment at 900 ~ 1000 ° C. A first mixing step (S1) of preparing a solid agent 30 by mixing a predetermined weight part of the paper-based flame retardant material 20 having a strong alkaline powder of 12.1 to 12.5 wt%;

        A mixture of 300 to 500 MESH of silica sand powder (40), dilute sulfuric acid (50) having a sulfuric acid concentration of 85 to 90%, and dolomite (60) consisting of calcium magnesium carbonate [CaMg (CO3) 2] are mixed in a predetermined weight part. Secondary mixing step (S2) to prepare a pH regulator 70;

        The first mixing step (S1) and the second mixing step (S2) described above are for convenience of explanation, and there is no order in which the mixture of the first step must be carried out first and the mixture of the second step must be carried out later. Although the second stage is mixed first, it is not related to the process. Only the solid mixture 30, which is the first mixture, and the pH adjuster 70, which is the second mixture are stored separately, and then simultaneously in the third mixing stage. There is only a restriction that requires a certain weight part.

        Mixing the solid agent 30 prepared in the first mixing step (S1) and the pH regulator 70 prepared in the second mixing step (S2) to a predetermined weight part in the sewage sludge 80 of the water content 75 ~ 85%. Reaction step (S3) to react with the water of the sewage sludge;

It includes a curing step (S4) to remove the heat of reaction and steam of the mixture passed through the reaction step (S3) to produce a land-improving agent 90 of the same form as the soil.

        In the first mixing step (S1), 20 to 40: 80 to 60 is made of coal ash (10) having a CaO content of 55 to 65 wt% and a papermaking combustion material (20) having a 40 to 45 wt% CaO content in a mixer (mixer). Step of preparing a solid (30) by mixing in parts by weight of.

        The reason is that the coal ash (10) has a CaO content of 55 to 65% by weight, which is excellent in curing function, but has a specific gravity of 2.7, and when mixed with a material having a high moisture content, it absorbs moisture and lowers the overall moisture content. . In addition, the papermaking combustion material 20 has a CaO content of 40 to 45% by weight, but the curing function is poor, but SiO2 of the components of the papermaking material is calcined at a high temperature and has a porous function. This is excellent. Therefore, as shown in Table 1, the refined fly ash (10) and the papermaking combustion material (20) are mixed at 20 to 40 parts by weight to 80 to 60 parts by weight, and the total of CaO and MgO having a curing function in the mixture is 50 to 50. It is because it is possible to produce a solid having the best curing function and water adsorption distribution function by making 60 parts by weight, and by making the sum of SiO2, a porous material having a water adsorption distribution function to 20 to 22% by weight.

        In this first mixing step (S1) CaO content of 55 ~ 65% by weight of coal ash (10) and CaO content of 40 ~ 45% by weight of the papermaking combustion material 20 by mixing CaO having a curing function of the mixture When the sum of and MgO is 50 parts by weight or less, that is, when the solid agent 30 is 100 parts by weight, when the mixing ratio of the coal ash 10 having a CaO content of 55 to 65% by weight is 20 parts by weight or less, the solidification function is deteriorated. The uniaxial compressive strength of the final land reformer 90 is 0.9 kgf / cm 2, which does not satisfy the standard value of 1 kgf / cm 2, and when the sum of CaO and MgO is more than 60 parts by weight, that is, the solid agent 30 is 100 weight. When the mixing ratio of the coal ash 10 having a CaO content of 55 to 65% by weight is 40 parts by weight or more, the water adsorption distribution function is lowered when mixing with the sewage sludge 80 in the reaction step (S3). Until this occurs, the mixture forms one unified form (stained mass) by the water of the sewage sludge 80 in the reactor. And, because in the reactor to the amount of animation curing step (S4) based mechanical feed is difficult.

Therefore, in the first mixing step (S1), the coal ash (10) having a CaO content of 55 to 65% by weight and the papermaking combustion material (20) having a CaO content of 40 to 45% by weight are 20 to 40: 80 to the mixer (mixer). It mixes by 60 weight part.

 Table 1. Chemical Composition of Fly Ash (10) and Paper Making Materials (20)

The coal ash 10 of the first mixing step (S1) uses a pressurized fluidized bed combustion technology in a cogeneration plant, and the furnace pressure is about 6-15 atm, the combustion temperature is 800-1200 degrees Celsius, and the layer material (sand, ash) is filled. It supplies coal to the furnace and burns it by air injected through the dispersion plate to directly inject the desulfurization agent (limestone) into the furnace to desulfurize during combustion and to burn fuel to use heat for cogeneration. After the completion of the remaining CaO content of 55 ~ 65% by weight, characterized in that the strongly alkaline powder of pH 11.8 ~ 12.5,

The papermaking combustion material 20 of the first mixing step (S1) dehydrates the sediment generated during papermaking wastewater treatment, and the CaO content generated after burning the dehydrated sediment at 900 to 1000 ° C. by using a combustion device is 40 ~. It is characterized in that the strong alkaline powder of pH 12.1 ~ 12.5 at 45% by weight.

        The second mixing step (S2) is a silicate powder (40), sulfuric acid concentration of 85 ~ 90% sulfuric acid (50) and dolomite (60) by mixing 60 to 75: 20 to 25: 5 parts by weight of the pH regulator (70) Manufacturing step.

Specifically, first, 70 parts by weight of high-part silica sand (40) is added to the mixer, and 20 to 25 parts by weight of dilute sulfuric acid (50) having a sulfuric acid concentration of 85 to 90% having strong acidity but no oxidizing power and dehydration is added. After mixing for 5 minutes, stirring is performed so that the dilute sulfuric acid (50) having a sulfuric acid concentration of 85 to 90% is evenly absorbed into the silica fine powder (40), and 5 parts by weight of dolomite (60) composed of calcium magnesium carbonate [CaMg (CO3) 2]. Put, stirring for about 3 to 5 minutes to prepare a strongly acidic pH adjuster 70 of pH 1 ~ 1.5.

In this case, the reason for using the silica sand (40) is that the neutral silica sand (40) having a pH of 6 to 7 absorbs the sulfuric acid (50) to the surface when reacted with the strongly acidic sulfuric acid (50), and the reaction heat and the reaction gas are not generated. Because it does not. (In other words, when mixed with alkaline powder having a pH of 7 or more, a large amount of product cannot be produced by reaction heat and reaction gas by acid and alkali.)

        Also, the reason why the silica sand 40 is added to the mixer before the dilute sulfuric acid 50 is that when the strong acid dilute sulfuric acid 50 is added to the mixer first, the silica sand powder 40 may react first in the mixer composed of iron, and the liquid dilute sulfuric acid ( 50) may elute into the mixer gap.

        In addition, the silica sand powder 40 and the dilute sulfuric acid (50) is mixed first, and then the dolomite (60) is mixed with the reason that the silica sand powder (40) does not chemically react with the strongly acidic dilute sulfuric acid (50), only the liquid dilute sulfuric acid ( Since 50) is absorbed on the surface of the silica sand 40, it maintains the strong acidic function of the dilute sulfuric acid 50 itself, but when it is stored in the cyclone by moisture contained in the dilute sulfuric acid 50, a phenomenon occurs that it aggregates by a certain pressure. do. Therefore, when the silica sand (40) and the dilute sulfuric acid (50) are mixed first, and then the dolomite (60) is mixed therewith, the dolomite gas (60) reacts with the dilute sulfuric acid (50) absorbed on the surface of the silica sand (40). This is because the surface of the mixture is dried due to mild heat, and the phenomenon of aggregation is not generated even when a constant pressure is applied during storage.

       In addition, the reason for mixing the silica sand (40), dilute sulfuric acid (50) and dolomite (60) 70: 20 ~ 25: 5 parts by weight of the reason is based on 70 parts by weight of silica sand (40) and 5 parts by weight of dolomite (60) If the 50) is less than 20, the strongly acidic function of the pH adjuster 70 is lowered by the weakly alkaline dolomite (60), and if the dilute sulfuric acid (50) is 25 or more, when stored in the cyclo by moisture contained in the dilute sulfuric acid (50) This is because agglomeration occurs due to pressure.

         Therefore, in the second mixing step (S2), the silica sand 40 and the dilute sulfuric acid 50 and dolomite 60 having a sulfuric acid concentration of 85 to 90% are mixed at 70: 20 to 25: 5 parts by weight.

         The silica fine powder 40 of the second mixing step (S2) is characterized in that the fine powder of 300 ~ 500 MESH collected dust generated during the grinding process of silica sand,

         The equivalent material of the silica fine powder 40 of the second mixing step (S2) is characterized in that the powder is ground powder of diatomaceous earth dried to less than 10% moisture content having a SiO2 structure and chemical composition as a basic unit in 200 ~ 300 MESH ,

        As the uniform material of the dolomite 60 in the second mixing step (S2), Calcium carbonate (CaCO3) and magnesium carbonate (MgCO3) having a carbonate (CO32-) structure and chemical composition as basic units are pulverized into 200 to 325 MESH. It is characterized by a powder.

 The reaction step (S3) is a pH adjuster prepared through the solid agent 30 and the second mixing step (S2) prepared by the sewage sludge 80 of the water content 75 ~ 85% and the first mixing step (S1). (70) is a step of mixing the mixture to 100 parts by weight of 35 ~ 40: 10 parts.

That is, the sewage sludge (80) containing 75 to 85% of moisture and the pH 12.3 to 12.5 prepared through the first step (S1) and the solid content of the CaO and MgO content of the components 50 to 60% by weight (30) And pH of 1 ~ 1.5 prepared through the second step (S2) is a pH adjusting agent 70 is a step of mixing the reaction to 100 parts by weight of 35:40:10. At this time, 75 ~ 85% of the sewage sludge 80 contained in 100 parts by weight of the solid agent (30) manufactured through the first step (S1) and 35 to 40 parts by weight of the second step (S2) The reason for the addition of 10 parts by weight of the pH adjuster 70 is as shown in Table 2, when the input ratio of the solid agent 30 is less than 35 parts by weight, the amount of solid adsorbent having a moisture adsorption distribution function and a curing function is less This is because the entire mixture is granulated during mixing, and when the input ratio of the solid agent 30 is more than 40 parts by weight, the pH of the mixture is increased to 11 or more, and NH 4 contained in the sewage sludge is ammonia. This is because it is generated as a gas. This is because NH4, which is dissolved in water in sewage sludge, is rapidly generated as NH3 when the pH of sewage sludge rises, that is, the amount of NH3 is also increased when PH rises. This is because it requires a facility to handle the waste easily, so it is desirable to generate less.

Therefore, in the reaction step (S3) the pH produced through the solid preparation 30 and the second mixing step (S2) produced through the first mixing step (S1) to the sewage sludge 80 of the water content 75 ~ 85%. The regulator 70 is reacted by mixing 100 parts by weight of 35 to 40: 10 parts by weight.

Table 2. Changes with Mixing Ratio

Curing step (S4) is to remove the heat of reaction and steam of the mixture passed through the reaction step (S3), to prepare a land improver 90 of the same form as the soil.

The reason for the curing step is that the CaO and MgO of the components of the solid preparation 30 prepared through the first step (S1) in the third reaction step (S3) is the pH produced through the second step (S2) Reaction of SO3 and moisture in the sewage sludge among the components of the regulator 70 generates heat of chemical reaction by acid and alkali, and the heat in the sewage sludge is partially evaporated by the heat of chemical reaction to shorten the curing time, and the solidifying agent 30 CaO and MgO are reacted with H2O in sewage sludge and replaced with Ca (OH) 2 and Mg (OH) 2, which react with CO2 in air and undergo carbonation reactions with CaCO3 and MgCO3. 90) can increase the strength.

Therefore, in the curing step (S4) to remove the heat of reaction and steam of the mixture passed through the third reaction step (S3), and to stabilize the mixture by reacting the mixture with oxygen and carbon dioxide in the air, a land improving agent having a certain strength (90) In order to manufacture the curing step (S4) is required.

Curing may be performed by natural curing or by curing the barrel to reduce the time by forcing hot air into the barrel.

In summary, the sum of CaO and MgO produced by mixing coal ash (10) having a CaO content of 55 to 65% by weight and papermaking combustion material (20) having a CaO content of 40 to 45% by weight is 50 to 60% by weight. % Solids (30), silica fine powder (40) of 300-500 MESH, sulfuric acid (50) and calcium magnesium carbonate [CaMg (CO3) 2] with strong acidity but 85-90% sulfuric acid concentration without oxidizing power and dehydration. When the pH regulator 70 prepared by mixing the composed dolomite 60 is reacted with the sewage sludge 80 having a water content of 75 to 85%, CaO and MgO in the components of the solid agent 30 are formed in the pH regulator 70. Reacts with SO3 and moisture in sewage sludge among the components, and heat of chemical reaction by acid and alkali is generated, and the water in sewage sludge is partially evaporated and starts to cure. CaO and MgO in the solid component 30 are H 2 O in sewage sludge. Reacts with Ca (OH) 2 and Mg (OH) 2, which reacts with CO2 in air to replace CaCO3 and MgCO3. By performing the reaction, which will increase the strength and also it produced the same type of land improving agent 90 and the pH and the ammonia gas is stabilized soil by a pH control agent (70).

In the land reforming agent manufacturing method using the sewage sludge, the solids 30 are manufactured to maintain the hardening function to the maximum, and to maximize the recycling amount of waste, thereby making it an inexpensive solid raw material that can replace quicklime and light dolomite. In addition, the pH regulator 70 can lower the pH, thereby suppressing a large amount of ammonia gas, and has the advantage that the land improver 90, which is the final product, can be utilized as the cover soil and the foundation soil in landfills without the occurrence of civil complaints. have.

Figure 1 shows a block diagram showing the process of the land improvement agent manufacturing method using the sewage sludge according to the present invention, the first mixing step (S1) and the second mixing step (S2) described above are attached for convenience. There is no order in which the mixture of the first stage must be carried out first and the mixture of the second stage must be carried out later, and it is not process related even if the second stage is mixed first. There is only a restriction that must be stored separately and added to a certain weight part at the same time in the reaction step.

Figure 2 shows the components of the mixture according to the mixing step according to the present invention, and describes the matter that can be used as diatomaceous earth as an alternative material of the silica fine powder 40, and as an alternative material of the dolomite 60, calcium carbonate and magnesium carbonate It describes the possible use of, and describes the weight parts of the components mixed in Table 1 and Table 2.

3 is a step-by-step embodiment according to the present invention,

4 is a land improver prepared according to the present invention.

As described above, the manufacturing method of the land improver using sewage sludge according to the present invention has been described, but the scope of the present invention is not limited thereto, and it is said that all technical matters in the range equivalent to those described in the claims are included. will be.

Description of the Related Art [0002]
10: Coal ash (Pressurized fluidized bed combustion technology in cogeneration plant uses furnace pressure of 6-15 atm and combustion temperature is 800-1200 ℃, supplying and dispersing coal to the furnace filled with layer material (sand, ash) Desulfurizer (limestone) is injected directly into the furnace in the way that it is combusted by the air injected through the plate to desulfurize during combustion, and the fuel is burned to use heat for cogeneration, and the remaining CaO content is Strong alkaline powder of pH 11.8 ~ 12.5 at 55 ~ 65% by weight)
20: Papermaking combustion material (strong alkaline powder with pH 12.1 ~ 12.5 with CaO content of 40 ~ 45 wt% after burning paper sludge at 900 ~ 1000 ℃)
30: solid agent (mixture of the coal ash (10) and the paper-burning material (20) 20 to 40: 80 to 60 parts by weight)
40: Silica fine powder (fine powder of 300 ~ 500 MESH, SiO2 which collected dust generated during the grinding process of silica sand)
50: Dilute sulfuric acid (liquid acid, liquid with 85 ~ 90% dilute sulfuric acid, 85 ~ 90% sulfuric acid with no oxidizing power and dehydration, H2SO4) (Reference: more than 90% mass sulfuric acid and less than 90% mass sulfuric acid)
60: dolomite (powder obtained by grinding calcium magnesium carbonate [CaMg (CO3) 2] to 200-325 MESH)
70: pH adjuster (a mixture of silica fine powder (40), dilute sulfuric acid (50) and dolomite (60) at 75: 20: 5 parts by weight, powder of pH 1 ~ 1.5)
80: sewage sludge (dehydrated cake with water content of 75 ~ 85%)
90: land improving agent (a mixture of sewage sludge (80), solid agent (30) and pH adjuster (70) 100: 30 ~ 40: 20 ~ 10 parts by weight)
S1: first mixing step
S2: second mixing step
S3: reaction step
S4: curing step

Claims (10)

The first mixing step (S1) of preparing a solid agent 30 by mixing coal ash (10) remaining after the fuel is terminated in the cogeneration plant and the papermaking combustion material (20) generated after burning paper sludge, and grinding of silica sand PH adjuster (70) by mixing silica fine powder (40) of 300-500 MESH, dilute sulfuric acid (50) having a sulfuric acid concentration of 85-90%, and dolomite (60) composed of calcium magnesium carbonate [CaMg (CO3) 2]. In the secondary mixing step (S2) and the sewage sludge having a water content of 75 to 85% to prepare a solid preparation 30 and the second mixing step (S2) prepared in the first mixing step (S1) Reaction step (S3) of mixing the prepared pH regulator 70 with the water of the sewage sludge, curing step of removing the reaction heat and steam of the mixture passed through the reaction step (S3) to prepare a land improving agent (90) In the land improvement agent manufacturing method using the sewage sludge provided with (S4),
The coal ash (10) is a pressurized fluidized bed combustion technology in cogeneration, the furnace pressure is 6-15 atm and the combustion temperature is 800-1200 ℃, supplying coal to the combustion furnace filled with layer material and through the distribution plate In order to burn by the injected air, desulfurizer is directly injected into the combustion furnace to desulfurize during combustion, and strong alkaline powder having pH of 11.8 ~ 12.5 with a CaO content of 55 ~ 65% by weight after fuel combustion is finished. Land improvement agent manufacturing method utilizing sewage sludge, characterized in that the. The method of claim 1,
The primary mixing step (S1) is a method for producing land improver utilizing sewage sludge, characterized in that the coal ash (10) and the papermaking combustion material 20 to 20 to 40: 80 to 60 parts by weight. The method of claim 1,
The secondary mixing step (S2) is a method for producing a land reformer using sewage sludge, characterized in that the silica sand powder (40), dilute sulfuric acid (50) and dolomite (60) to 70: 20 to 25: 5 parts by weight. The method of claim 1,
The reaction step (S3) is the sewage sludge 80 of the water content 75 ~ 85%, the solidifying agent 30 of the first mixing step (S1) and the pH adjuster 70 of the second mixing step (S2) 100 : A land improvement agent manufacturing method using sewage sludge, characterized in that mixed by 35 to 40: 10 parts by weight. delete The method according to claim 1 or 2,
The papermaking combustion material 20 dehydrates the sediment generated during papermaking wastewater treatment, and the dehydrated sediment is 40 to 45% by weight of CaO generated after combustion at 900 to 1000 ° C. using a combustion device, and pH 12.1 to A land improver manufacturing method using sewage sludge, characterized in that the strong alkaline powder of 12.5.
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