KR100788441B1 - Manufacturing method of acidic group powder lithification chemical and lithification treatment method for sludge using the same - Google Patents

Abstract

The present invention relates to a method for producing an acidic powder solidifying agent and a solidification treatment method of sludge using the same, and in detail, waste waste gypsum and ferrous sulfate heptahydrate, which are workplace wastes, are prepared as an acidic powder, and a large amount of water is used therein. This is to solidify sewage sludge and use it as cover material.

According to the method for producing an acidic powder solidifying agent and a sewage sludge solidification method using the same according to the present invention for this purpose; Sulfuric acid and ferrous sulfate heptahydrate are mixed with solids dried to within 5% water content, and then cured to prepare an acidic powder solidifying agent, and the acidic powder solidifying agent thus prepared is applied to the sludge at a predetermined ratio. It is a method of solidifying a sludge into a cover material of the same form as soil in a short time by mixing.

Currently, workplace wastes such as waste gypsum rely on landfills and yards for common waters, and sludges such as sewage sludges are treated with most of marine dumping due to low processing costs.

Therefore, the present invention is to recycle the waste of the workplace such as waste gypsum, which is dependent on landfills and yards, as an acidic powder solidifying agent, and recycle the sludge depending on ocean dumping as a cover material, so that the secondary environment by ocean discharge and landfill It has the advantage of preventing pollution and replacing earth and sand, a scarce resource.

Description

 Manufacturing method of acidic powder solidifying agent and solidifying treatment method of sludge using same {Manufacturing method of acidic group powder lithification chemical and lithification treatment method for sludge using the same}

1 shows a block diagram showing a manufacturing process according to the present invention,

2 shows the components of the mixture according to the invention,

3 is a photo of the acid-based powder manufacturing process prepared according to the present invention,

Figure 4 is a photograph of the solidification process of sewage sludge using an acid-based powder prepared according to the present invention.

* Description of the symbols for the main parts of the drawings *

10: sulfuric acid (concentration 96% or more) 20: ferrous sulfate heptahydrate

30: solid content (within 5% of water content) 40: quicklime

50: sludge

S1: 1st mixing step S2: 2nd mixing step

S3: 1st curing step S4: 3rd mixing step

S5: Second Curing Stage

The present invention relates to a method for preparing an acidic powder solidifying agent and a solidification treatment method of sludge using the same, and more specifically, to a sulfuric acid (10) having a concentration of 96% by administering a ferrous sulfate heptahydrate (20) in a predetermined ratio. Then, the waste gypsum powder, steel dust or steel slag, which is dried at a moisture content of 5% or less is administered at a predetermined rate and stirred, and the mixture is naturally cured for 2 hours to prepare an acidic powder solidifying agent. When the acidic powder solidifying agent and the alkaline powder 40 are administered to the sludge 50 containing a large amount of water at a predetermined ratio and stirred, the acidic powder solidifying agent and the alkaline powder 40 are the water of the sludge 50. Dissolved in, neutralized by acid and alkali, exothermic to above 70 degrees Celsius, and started to solidify, at which time the mixture was ferrous sulfate contained in an acidic powder solidifying agent. By oxidation with earth colors, a method of treatment and solidified in the same manner of boktojae and dirt.

Conventional methods of final treatment of various sludge and sludge wastes generated in water and sewage treatment plants, industrial wastewater treatment plants, serving plants, and livestock farms include solidification treatments such as incineration and fermentation, and landfilling. In the case of the landfill method which is widely adopted, landfill wastes of sludge or sludge with a water content of about 85% are disposed of in general waste landfills without any treatment, which reduces the quality of leachate, increases the amount of leachate, and increases the amount of landfill. It is not possible to reuse over time, increasing the secondary environmental pollution factor around the landfill.

Conventional methods for treating sludge, such as sewage sludge, include incineration, carbonization, compost, and ocean discharge. However, due to the relatively low dual treatment cost, most of the sludge is treated as marine discharge.

However, depending on the yard, the site for the yard becomes more necessary as time goes by, and the cost of the yard also increases due to the increase in land prices. It is necessary to increase the pollution of water resources due to the pollution of marine ecosystems by generating marine pollution, and it is found in the hair of young children living near the coast where there is a high possibility of eating contaminated seafood from marine waste. The fact that tertiary pollution is increasing can be easily seen through air broadcasting, and demonstrations for demonstrators to prevent such easy ocean dumping are increasing.

Since landfilling does not have economic problems due to expensive disposal costs, and the yard contains the problem of complaints such as environmental pollution, it is urgent that a new recycling method that can replace the scarce resources at a low disposal cost is urgent. .

At present, the only metropolitan landfill solidification plant in Korea is used as a cover material by mixing and solidifying cement, quicklime and frying ash, but due to the strong alkaline hardener, the mixture has a large amount of ammonia odor and is higher than the sludge import fee. There is a problem in that the treatment cost of the topic is more expensive, and above all, a long curing period is required.

Therefore, it is urgent to develop a new alternative solidifying agent and a solidification treatment technology that can prevent secondary environmental pollution caused by ocean dumping and landfilling of sludge, and minimize sludge solidification cost, and recycle sludge as cover material.

The present invention is to solve this problem; An object of the present invention is to prevent secondary environmental pollution by marine dumping and landfill of sludge, and also by recycling the solids of the workplace waste with acid-based powder solidifying agent, to minimize the cost of sludge solidification such as sludge, and also generates ammonia It is an object of the present invention to provide a method of solidifying sludge in a short time, and solidifying the cover material with the same form as soil.

The present invention for achieving this object is specifically;

In the method for producing an acidic powder solidifying agent and the sludge solidification treatment method using the same,

A first mixing step (S1) of mixing the ferrous sulfate heptahydrate 20 with sulfuric acid 10 having a concentration of 96%; A second mixing step (S2) of mixing the solid content 30 dried to within 5% of a water content to the mixture which passed through the first mixing step (S1);

Primary curing step (S3) for cooling and powdering the heat of the mixture passed through the second mixing step (S2);

A third mixing step (S4) of mixing the alkaline powder 40 and the sludge 50 containing a large amount of water in the acidic powder prepared through the first curing step (S3);

Characterized in that the secondary curing step (S5) for stabilizing the moisture of the mixture passed through the third mixing step (S4),

The mixing step (S1) is characterized in that the mixture of sulfuric acid (10) and ferrous sulfate heptahydrate (20) having a concentration of 96% to the total weight of the mixture in a ratio of 3.5 to 5: 1 by weight,

The second mixing step (S2) is a mixture of the mixture and the solid content (30) dried in less than 5% moisture content of the mixture through the first mixing step (S1) to the total weight of the mixture in a ratio of 1: 1.5 ~ 2 by weight ratio It is characterized by.

The third mixing step (S4) is a mixture of the acid-based powder and the alkali-based powder 40 prepared by the first curing step with respect to the total weight of the mixture in a ratio of 2 to 2.5: 1 by weight, and mixed acidic As the water content of the powder and the alkaline powder 40 contained in the sludge 50 containing a large amount of water is increased, the mixed acidic powder and the alkaline powder 40 are increased to 6 to a weight ratio. It is characterized by mixing in a ratio of 13:20.

Solid content 30 is added to the secondary mixing step (S2) in the present specification is waste lime, waste gypsum, steel dust, steel slag, fly ash, construction soil, stone powder sludge, purified water sludge, dredged soil, mudflat, stream sloping, dyeing sludge, It is defined as a powder obtained by drying at least one of sludge such as sewage sludge and plated sludge within 5% water content.

The alkali-based powder 40 introduced into the tertiary mixing step S4 is defined as at least one of quicklime, cement, and magnesium oxide.

The sludge 50 introduced into the tertiary mixing step (S4) is defined as at least one of sewage sludge, dyeing sludge, purified sludge, dredged soil, mudflat, stream sludge, construction soil, food sludge, and plated sludge.

The secondary curing step (S5) is the mixture is passed through the third mixing step (S4) in order to smoothly discharge the water vapor of the mixture generated by the exotherm generated by the exotherm 3 to 4 times the mixture for 24 to 48 hours By stabilizing the water through, the mixture is in contact with the air is oxidized to ocher color so as to produce an acid-based powder solidifying agent, characterized in that the solidified in the same form as the soil and the solidification treatment method of the sludge using the same.

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

1 shows a block diagram showing a manufacturing process according to the present invention,

2 shows the components of the mixture according to the invention,

3 is a photo of the acid-based powder manufacturing process prepared according to the present invention,

Figure 4 is a photograph of the solidification process of the sludge using the acid-based powder prepared according to the present invention.

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

The acid-based powder solidifying agent production method and the sludge solidification treatment method using the same according to the present invention, as shown in the block diagram showing the manufacturing process in FIG.

The first mixing step (S1) is to mix the ferrous sulfate heptahydrate 20 with 96% sulfuric acid (10), the sulfuric acid (10) and sulfuric acid of 96% concentration through a mixer (mixer) based on the total weight of the mixture It is a process of stirring ferrous heptahydrate 20 in the ratio of 3.5-5: 1 by weight ratio.

In other words, the ferrous sulfate heptahydrate is mixed to have an oxidation function of the acidic powder. At this time, the ferrous sulfate heptahydrate is preferably not more than 1 by weight ratio. The reason is that when the ferrous sulfate heptahydrate is more than 1, sulfuric acid is gelled and the mixture is agglomerated by viscosity when mixed with the secondary solids. Ferrous sulfate heptahydrate is added in a ratio of 3.5 to 5: 1 by weight.

The second mixing step (S2) is a step of mixing the solids 30 dried to within 5% of the water content to the mixture that passed through the first mixing step (S1), the first mixing step through the mixer (mixer) for the total weight of the mixture It is a process of stirring the mixture which passed through (S1) and the solid content 30 dried within 5% of water content in the ratio of 1: 1.5-2 by weight ratio, and is a process for making sulfuric acid react evenly on the surface area of solid content.

In this case, the solid content is preferably 5% or less and mixed at a weight ratio of 1.5 or more and 2 or less. The reason is that when the moisture content of the solid content is 5% or more, or 1.5 or less by weight, the mixture reacts with sulfuric acid to break up and becomes viscous and agglomerates.When the solid content is 2 or more by weight, the function of the acid group is weakened. This can be caused by degradation. That is, when the mixture of sulfuric acid and ferrous sulfate heptahydrate reacts to the maximum of the surface area of solid content at a maximum ratio of 2 or less by weight.

The powder that can be added as the solids 30 introduced into the secondary mixing step (S2) is waste lime, waste gypsum, steel dust, steel slag, fly ash, construction soil, stone sludge, purified water sludge, dredged soil, mudflat, river Journey At least one of the sludges such as dyed sludge, sewage sludge, and plated sludge is dried to within 5% water content.

The first curing step (S3) is a step for cooling and powdering the heat of the mixture passed through the second mixing step (S2), to cool and powder the heat of the mixture through the second mixing step (S2) 2 Natural curing for 4 hours.

That is, in the second mixing step, a mixture of sulfuric acid and ferrous sulfate heptahydrate is reacted with the surface of the solid to generate heat of 90 degrees Celsius or more, at which time a large amount of sulfuric acid gas is discharged and gradually reacts with air, and the mixture is, for example Waste gypsum is changed from reddish brown to green and powdered. The powdered acidic powder does not have its own oxidizing power but shows strong acidity when it comes into contact with water and has a strong oxidizing power.

The tertiary mixing step (S4) is an alkali-based powder (40) selected from at least one of quicklime, cement, and magnesium oxide in the acidic powder prepared through the first curing step (S3), containing a large amount of water, sewage sludge, At least one sludge 50 selected from dyeing sludge, purified sludge, dredged soil, mud flat, stream sludge, construction soil, food sludge, and plated sludge is mixed, and the first curing step (S3) is performed for the total weight of the mixture. The prepared acidic powder and alkali-based powder 40 are mixed in a ratio of 2 to 2.5: 1 by weight, and included in the sludge 50 containing a large amount of moisture compared to the mixed acidic powder and alkaline-based powder 40. As the water content of the water is increased, the mixed acidic powder and alkali-based powder 40 are increased, and the mixture is stirred at a ratio of 6 to 13: 20 in a weight ratio, and the mixture is stirred. If the moisture content is 60% -80% It is common with.

That is, it is a process for solidifying sludge by the neutralization reaction of acid and alkali. More specifically, the acidic powder solidifying agent and the alkaline powder 40 are dissolved in the water of the sludge 50, and by the neutralization reaction with acid and alkali, the mixture exotherms above 70 degrees Celsius and starts to solidify. At this time, the mixture is oxidized to yellow earth color by ferrous sulfate contained in the acidic powder solidifying agent, and is a process for solidifying the cover material with the same form as soil.

At this time, the acidic powder is an alkali-based powder, and in the case of quicklime, two or more times should be mixed.

The reason is that when it comes into contact with water, the acidic powder will have a pH of 1 ~ 2 and the quicklime, which is an alkaline powder, will have 12.5 ~ 13. In order to avoid the generation of ammonia gas, it is preferable that the acidic powder is maintained at least twice that of the alkaline powder.

At least one of cement and magnesium oxide may be used instead of quicklime as the alkaline powder 40 introduced into the tertiary mixing step (S4), and as the sludge 50, instead of sewage sludge, dyed sludge, purified sludge, dredged soil, At least one of tidal flats, river sills, construction soils, food sludge and plated sludge may be used.

Secondary curing step (S5) is a step for stabilizing the water of the mixture through the third mixing step (S4), is a natural curing process for stabilizing the water of the mixture through the third mixing step (S4).

That is, the process for stabilizing the moisture of the mixture passed through the third mixing step (S4). In detail, the mixture passed through the third mixing step (S4) is granulated to generate steam by exotherm. At this time, the mixture is inverted three to four times to smoothly discharge the vapor of the mixture. Thus, the water is stabilized through three to four turnovers for 24 to 48 hours, and the mixture is oxidized to ocher color in contact with air, and becomes a solid like the soil.

The manufacturing principle of the acidic powder is sulfuric acid is absorbed by the sulfuric acid when the sulfuric acid reacts with the solid content, the heat generated by the sulfuric acid gas is discharged, the surface of the waste gypsum reacted with sulfuric acid is dried by reacting with air. The solid content reacted with sulfuric acid does not have its own oxidizing power, but it has a function of continuously absorbing moisture in the air, and also has a strong oxidizing power when it is contacted with moisture and is converted into a strong acidic material.

In addition, for example, the principle of solidification treatment of sewage sludge is that the acidic powder reacts with the water of the sewage sludge to become a strongly acidic material having a strong oxidizing power, and thus reacts with strong alkaline quicklime and is strong by neutralization by acid and alkali. It is a principle that heat is generated, the water of sewage sludge is evaporated with water vapor and solidified.

Figure 2 shows the components of the mixture according to the present invention, which shows the components added to solidify the sewage sludge, and the components included in the acidic powder solidifying agent.

3 is a photo of the acid-based powder manufacturing process prepared according to the present invention,

Figure 4 is a photograph of the solidification process of sewage sludge using an acid-based powder prepared according to the present invention.

As described above, the acid-based powder solidifying agent production method and the sewage sludge solidification treatment method using the same have been described, but the scope of the present invention is not limited thereto, and all of the ranges equivalent to those described in the claims It's crazy about technical ideas.

As described in detail above; According to the acid-based powder hardener production method and the sludge solidification treatment method using the same; For example, the solid waste, including waste gypsum, is mixed and cured to produce an acidic powder solidifying agent.The acidic powder solidifying agent thus prepared is mixed with alkali powder such as quicklime in a predetermined ratio. It can be mixed with sludge, such as sewage sludge, and recycled in a short time to cover the same type of soil as soil, preventing secondary environmental pollution caused by ocean discharge and landfill, and replacing the lack of resources.

Claims (8)

In the method for producing an acidic powder solidifying agent and the sludge solidification treatment method using the same, A first mixing step (S1) of mixing the ferrous sulfate heptahydrate 20 with sulfuric acid 10 having a concentration of 96%; A second mixing step (S2) of mixing the solid content 30 dried to within 5% of a water content to the mixture which passed through the first mixing step (S1); A first curing step (S3) for cooling and powdering the mixture through the second mixing step (S2); A third mixing step (S4) of mixing the alkaline powder 40 and the sludge 50 containing a large amount of water in the acidic powder prepared through the first curing step (S3); Method for producing an acidic powder solidifying agent, characterized in that it comprises a secondary curing step (S5) for stabilizing the moisture of the mixture passed through the third mixing step (S4) and the sludge solidification treatment method using the same. The method of claim 1, The mixing step (S1) is an acidic powder solidifying agent, characterized in that the mixture of sulfuric acid (10) and ferrous sulfate heptahydrate (20) having a concentration of 96% to the weight of the mixture in a ratio of 3.5 to 5: 1 by weight ratio Manufacturing method and solidification treatment method of sludge using the same. The method of claim 1, The second mixing step (S2) is a mixture of the mixture and the solid content (30) dried in less than 5% moisture content of the mixture through the first mixing step (S1) to the total weight of the mixture in a ratio of 1: 1.5 ~ 2 by weight ratio An acid-based powder solidifying agent production method, and sludge solidification treatment method using the same. The method of claim 1, The third mixing step (S4) is a mixture of acidic powder and alkali-based powder 40 prepared by the first curing step with respect to the total weight of the mixture in a ratio of 2 to 2.5: 1 by weight, and mixed acidic As the water content of the water contained in the sludge 50 containing a large amount of water compared to the powder and the alkaline powder 40 increases, the mixed acidic powder and the alkaline powder 40 are increased to 6 to a weight ratio. 13. A method for producing an acidic powder solidifying agent, and a method for solidifying sludge using the same, characterized by mixing at a ratio of 13:20. The method of claim 1 or 3, The solids 30 introduced into the secondary mixing step (S2) are waste lime, waste gypsum, steel dust, steel slag, construction soil, fly ash, stone powder sludge, purified water sludge, dredged soil, mudflat, river sludge, dyeing sludge, sewage sludge And a powder obtained by drying at least one selected from sludge such as plating sludge within 5% of water content, and a method for solidifying sludge using the same. The method according to claim 1 or 4, Alkaline-based powder 40 is added to the tertiary mixing step (S4) is an acid-based powder solidification method, characterized in that at least any one selected from quicklime, cement, magnesium oxide and solidification treatment method of the sludge using the same. The method according to claim 1 or 4, The sludge 50 introduced into the tertiary mixing step (S4) is at least one selected from sewage sludge, dyeing sludge, purified sludge, dredged soil, mudflat, stream sludge, construction soil, food sludge, plating sludge. A method for producing an acidic powder solidifying agent and a method for solidifying sludge using the same. The method of claim 1, The secondary curing step (S5) is the mixture is passed through the third mixing step (S4) in order to smoothly discharge the water vapor of the mixture generated by the exotherm generated by the exotherm 3 to 4 times the mixture for 24 to 48 hours A method of preparing an acidic powder solidifying agent and a method of solidifying sludge using the same, characterized in that to stabilize the water through the mixture, and the mixture is oxidized to ocher color in contact with air to form a solid in the same form as soil.

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