KR101156737B1 - Additive for sludge solidifying agent, method of preparing the same, and solidification treatment method of sludge using the same - Google Patents
Additive for sludge solidifying agent, method of preparing the same, and solidification treatment method of sludge using the same Download PDFInfo
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- KR101156737B1 KR101156737B1 KR1020100063152A KR20100063152A KR101156737B1 KR 101156737 B1 KR101156737 B1 KR 101156737B1 KR 1020100063152 A KR1020100063152 A KR 1020100063152A KR 20100063152 A KR20100063152 A KR 20100063152A KR 101156737 B1 KR101156737 B1 KR 101156737B1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/30—Wastewater or sewage treatment systems using renewable energies
- Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy
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Abstract
Additives for sludge hardeners comprising from 50 to 98% by weight of a porous compound, from 1 to 49% by weight of sulfuric acid, and from 1 to 20% by weight of a surface solid agent, wherein the porous compound contains sodium aluminum sulfate, calcium sulfate, and silicon dioxide. The manufacturing method of the additive for sludge solidification agent, and the solidification process of sludge using the additive for sludge solidification agent are disclosed.
Description
The present invention relates to a sludge solidifying agent additive, a sludge solidifying agent additive manufacturing method, and a sludge solidifying agent additive treatment method.
Sludge is a liquid or semi-solid liquid with a very large volume, which is generated by the precipitation of suspended solids in the process of treating sewage or waste water. The Enforcement Decree of the Waste Management Act defines sludge to be less than 95% water content or 5% or more solids.
These sludges are high in organic matter and can collect harmful substances such as various organic compounds and heavy metals. Therefore, these sludges may have high contents of harmful substances. Although the pollutant content varies depending on the characteristics of pollutant emission from the source and the sewage treatment technique of the sewage treatment plant, sludge contains a lot of nutrients necessary for plant growth. In this case it can be used as a fertilizer. However, if it contains a significant amount of pathogens, such as bacteria, protozoa and viruses, it must be removed through a separate treatment and discharged into the environment.
Currently, most of the more than 3,000 tons of sludge generated in sewage treatment plants, industrial complexes, and end-of-life treatment plants, and in each single plant or industrial complex are disposed of in landfills or dumped at sea because of low processing costs.
However, dumping at sea will be banned from 2011 due to amendments to the Waste Management Act under the London Convention, and landfilling is not free because of the limited amount of landfills, and the conditions for landfilling are very demanding. In particular, since a large amount of wastes generated in other fields are buried together, the place for landfill is rapidly exhausted, and there are many difficulties in selecting landfill sites, causing regional conflicts and social problems. In addition, although the sludge is dewatered and dried to a certain extent before being landfilled, the water content is still high, so leachate that pollutes the air by causing odors and toxic gases during landfilling and contaminates the groundwater causes contamination of groundwater.
Alternative treatment methods for sludge include treatment methods such as incineration, fermentation, and carbonization. Incineration method is the most preferred treatment method because of the know-how of technology and high performance, but it is uneconomical due to excessive construction and investment costs, and there are many problems such as complaints about secondary environmental pollution such as dioxin emissions. There are many difficulties, and the composting or carbonization treatment is also difficult to apply due to excessive operating costs and unclear treatment of the final product.
Therefore, considering the domestic and foreign conditions and practical problems, the development of solidification agent and solidification treatment technology to prevent secondary environmental pollution and minimize the cost of solidification of sludge and recycle it as cover soil material as an effective resource plan for sludge. Development is required.
It is an object of the present invention to provide an additive for sludge hardening agent which prevents environmental pollution by landfilling and ocean dumping of sludge, minimizes the cost of solidification without generating odor of ammonia, and exhibits an improved water removal and pH lowering effect.
Another object of the present invention is to provide a method for preparing the additive for sludge hardening agent.
Another object of the present invention is to provide a sludge solidification treatment method using the additive for sludge solidifying agent.
The present invention to achieve the above object,
At least one selected from the group consisting of 50 to 98% by weight of a porous compound, 1 to 49% by weight of sulfuric acid, and 1 to 20% by weight of a surface solid agent, wherein the porous compound is selected from the group consisting of sodium aluminum sulfate, calcium sulfate, and silicon dioxide An additive for sludge hardening agent containing is provided.
In order to achieve the above another object, the present invention,
Additive for sludge hardening agent comprising 90 to 99% by weight of the porous compound and 1 to 10% by weight of the surface solidifying agent, wherein the porous compound contains at least one member selected from the group consisting of sodium aluminum sulfate, calcium sulfate, and silicon dioxide. To provide.
The surface solid agent may be at least one selected from the group consisting of calcium oxide, magnesium oxide, hydrated lime, quicklime, limestone, cement, and fly ash.
The sludge hardener additive may contain 70 to 75 wt% of the porous compound, 15 to 20 wt% of sulfuric acid, and 5 to 15 wt% of the surface solidifying agent.
The porous compound may contain 35 to 65% by weight of sodium aluminum sulfate, 10 to 40% by weight of calcium sulfate, and 10 to 40% by weight of silicon dioxide.
In order to achieve the above another object, the present invention,
Mixing the porous compound and sulfuric acid; And
Adding a surface solid agent to the resultant mixture of the porous compound and sulfuric acid to form a granular mixture,
Provided is a method for producing an additive for sludge hardening agent, wherein the porous compound contains at least one member selected from the group consisting of sodium aluminum sulfate, calcium sulfate, and silicon dioxide.
In order to achieve the above another object, the present invention,
Mixing the sludge hardener additive and the sludge hardener; And
It provides a sludge solidification treatment method comprising the step of adding a sludge to the mixed result.
According to the present invention, a porous compound (aka SAS, Sulfuric acid Aluminum Sodium salt), which is a by-product generated in a hydrofluoric acid recovery step in a polysilicon manufacturing process and contains at least one of sodium aluminum sulfate, calcium sulfate, and silicon dioxide, By recycling, it is more economical, effectively removes ammonia odor from sludge, removes moisture in a faster time, and lowers the pH of the solidified sludge to near neutrality, which can increase the utilization value as a cover material for plant growth. It is possible to provide an additive for sludge solidifying agent, and a sludge solidification treatment method using the same.
Hereinafter, the present invention will be described in more detail.
An additive for sludge solidifying agent according to an embodiment of the present invention comprises 50 to 98% by weight of a porous compound, 1 to 49% by weight of sulfuric acid, and 1 to 20% by weight of the surface solid agent, wherein the porous compound is sodium aluminum sulfate, It is an additive for sludge hardening agent containing 1 or more types chosen from the group which consists of calcium sulfate and silicon dioxide.
The sludge solidifying agent additive is a strongly acidic compound having a strong oxidizing power, and reacts with a solidifying agent, which is a strong alkali compound, in the sludge solidification process to generate heat by neutralization reaction with acid and alkali, and the moisture in the sludge by the heat of neutralization. It evaporates and serves to solidify the sludge.
The porous compound may be obtained as a by-product during the recovery of fluorine from the hydrofluoric acid compound used in the polysilicon manufacturing process, and is also advantageous in terms of recycling waste.
As a result, ferrous sulfate, aluminum sulfate, and the like, which are conventionally used for sludge solidification, are very expensive, and the porous compounds obtained from the by-products of the polysilicon production process are very inexpensive and economical.
In addition, the porous compound undergoes a calcination process at a temperature of about 400 ° C. or higher during the recovery process to have amorphous and excellent porosity properties, and unlike ordinary sulfates, the liquid absorption ability is remarkably improved.
At this time, the porous compound contains at least one member selected from the group consisting of sodium aluminum sulfate, calcium sulfate, and silicon dioxide.
The sodium aluminum sulfate generally refers to a hydrous sulfate of aluminum and sodium represented by the general formula of AlNa (SO 4 ) 2 to 12H 2 O, and has a melting point of 61 ° C. as a colorless crystal and shows acidity in water. to be.
While relatively inexpensive ammonium sulphate used for solidifying sludge has problems in handling such as ammonia odor, sodium aluminum sulphate produces ammonium sulphate when reacted with ammonia generated in sludge. It can play a role of removing, preventing the problem of additional environmental pollution even after the sludge is solidified and landfilled.
As described above, the porous compound may consist of only one kind of sodium aluminum sulfate, calcium sulfate, and silicon dioxide, or may exist in a mixture of two or more kinds.
In addition, when the porous compound is present as a mixture of sodium aluminum sulfate, calcium sulfate, and silicon dioxide, the content of sodium aluminum sulfate is 35 to 65% by weight, preferably 40 to 60% by weight, more preferably 45 to 55% by weight, the content of calcium sulfate is 10 to 40% by weight, preferably 15 to 35% by weight, more preferably 20 to 30% by weight, and the content of silicon dioxide is 10 to 40% by weight, preferably 15 to 35% by weight, more preferably 20 to 30% by weight.
At this time, when the content of sodium aluminum sulfate, calcium sulfate, and silicon dioxide in the porous compound satisfies the above range, the odor removal ability is improved during the sludge solidification treatment with sodium aluminum sulfate, and silicon dioxide having excellent porosity characteristics is particularly excellent. This further increases the absorption capacity of sulfuric acid when mixed with sulfuric acid, thereby generating sufficient heat of reaction in the neutralization reaction with the solidifying agent.
The sulfuric acid may be pure sulfuric acid or a purity of 95 to 99%. Moreover, it can mix and use with waste acid in the range which does not reduce acidity as much as possible.
In the additive for sludge hardening agent, the content of the porous compound is 50 to 98% by weight, preferably 60 to 80% by weight, more preferably 70 to 75% by weight, and the content of sulfuric acid is 1 to 49% by weight. Preferably 30 to 10% by weight, more preferably 15 to 20% by weight.
At this time, when the content of the porous compound is less than 50% by weight or the content of sulfuric acid is more than 49% by weight, the content of sulfuric acid is increased so that the heat of neutralization generated in the neutralization reaction with a strong alkali-based solidifying agent is too high. As a result, the water content of the solidified sludge can be extremely reduced, which can be too hard.
In addition, when the content of the porous compound is more than 98% by weight, or the content of sulfuric acid is less than 1% by weight, excessive aggregation occurs when mixed with the surface solid agent, or as a result of the neutralization reaction with the solidifying agent in the sludge Since the heat of neutralization is small, the rising temperature is low, and as a result, it may not be able to sufficiently remove the water contained in the sludge.
When the porous compound and sulfuric acid are mixed, most of sulfuric acid is absorbed into the internal pores of the porous compound having the property of amorphous porosity, and only a part of sulfuric acid is present on the surface of the porous compound.
Therefore, the surface solidifying agent contacts the sulfuric acid present in the exterior of the porous compound to solidify the surface to form an additive for solidifying slurry, and then the sulfuric acid absorbed inside the porous compound is discharged to the outside in the process of mixing with the sludge solidifying agent. It is responsible for inducing sufficient neutralization reaction.
As a result, the surface solid agent can be used without limitation as long as it is an alkaline compound capable of causing a neutralization reaction with sulfuric acid. For example, one kind selected from the group consisting of calcium oxide, magnesium oxide, slaked lime, quicklime, limestone, cement, and the like can be used. The above can be used.
If the content of the surface solids is 1 to 20% by weight, preferably 5 to 15% by weight, and the content of the surface solids is less than 1% by weight, the absorbed sulfuric acid may be lost due to insufficient solidification of the surface of the porous compound. In the case of more than 20% by weight, the acidity of the obtained additive for solidifying agent may be weakened, or the remaining surface solidifying agent may participate in the neutralization reaction during the sludge solidification treatment, so that it may be difficult to control the water content of the sludge smoothly.
When the porous compound, sulfuric acid, and the surface solid agent are mixed, the granular form can be formed through surface solidification reaction, and the coagulant is formed by mixing the coagulant in a constant ratio, so that the additive for the sludge solidifying agent in the form of a more uniform and solid granule is formed. This can be obtained.
The flocculant may be used without limitation as long as it can improve the flocculation performance of the mixture containing the porous compound, sulfuric acid and the surface solidifying agent, and improve the surface strength.
Specifically, at least one selected from the group consisting of inorganic coagulants, cationic polymer coagulants, anionic polymer coagulants, and nonionic polymer coagulants may be used.
Inorganic flocculants include conventionally known inorganic flocculants such as aluminum sulfate, polyaluminum chloride (PAC), iron polysulfate, polyiron chloride, aluminum silicate, ferric chloride, iron sulfate, and the like. Two or more kinds may be used in combination. Such aluminum sulfate is inexpensive and can also act as a pH adjuster for the alkali component contained in the solidifying agent. In addition, the inorganic flocculant can exhibit a synergistic flocculation effect by being combined with a polymer flocculant described later.
Cationic polymer flocculants include water-soluble aniline resin hydrochloride, polyethylene amine, polyvinyl imidazoline, polyvinylpyridine, polyamine, polydiaryldimethylammonium chloride, polyaminoacrylate, polyalkylaminomethacrylate, hexamethylenediamine-epi Conventionally known cationic polymer flocculants such as polycondensation reactants of chlorohydrin, chitosan, alkylaminomethacrylate quaternary salt polymer, alkylaminoacrylate quaternary salt-acrylamide copolymer, polyamidine hydrochloride, and the like. May be used alone or in combination of two or more thereof.
Examples of the anionic polymer flocculant include sodium acrylate, polyacrylamide partial hydrolyzate, acrylamide-vinylsulfonate copolymer, acrylamide-sodium acrylate copolymer, acrylamide-acrylamide-2-methylpropanesulfonate copolymer and acryl Conventionally known anionic flocculants such as amide-vinylsulfonic acid sodium copolymer and the like, and one of these may be used alone or in combination of two or more thereof.
In addition, polyacrylamide, polyethylene oxide, or the like may be used as the nonionic polymer flocculant.
The content of such flocculant is 0.001 to 0.5 parts by weight, preferably 0.001 to 0.005 parts by weight, based on 100 parts by weight of the mixture containing the porous compound, sulfuric acid and the surface solid agent. If the content of the flocculant is less than 0.001 part by weight, the flocculation effect may not be exhibited. If the content of the flocculant is greater than 0.5 part by weight, fine aggregates may be increased, economic efficiency may be worsened, or excess flocculant may be eluted, causing environmental pollution. .
Method for producing an additive for sludge solidifying agent according to an embodiment of the present invention comprises the steps of mixing a porous compound and sulfuric acid; And adding a surface solid agent to the mixed product of the porous compound and sulfuric acid to form a granular mixture, wherein the porous compound comprises at least one selected from the group consisting of sodium aluminum sulfate, calcium sulfate, and silicon dioxide. It contains.
The first step is to mix the porous compound and sulfuric acid. The first step is to sufficiently mix sulfuric acid using a mixer to absorb the sulfuric acid up to the inside of the porous compound. This step is to further enhance the acidic function to the porous compound which is an acidic compound so that it can occur effectively.
In the second step, the surface solid agent is added to the resultant mixture of sulfuric acid and the porous compound, which is the result of the first step, and stirred to form a granular mixture. The added surface solidizer is an alkaline compound such as calcium oxide, magnesium oxide, hydrated lime, quicklime, limestone, cement, etc., as described above, in contact with some sulfuric acid remaining on the surface of the porous compound mainly containing sulfuric acid. It serves to solidify to form a granular mixture. As a result, the strong acidic properties of sulfuric acid are preserved without weakening until the reaction with the solidifying agent occurs in the solidification treatment process of the sludge, thereby enabling the neutralization reaction to take place effectively later.
On the other hand, by adding a predetermined amount of flocculant to the mixture of the obtained granular mixture to improve the cohesive performance of the mixture, it may be further added to improve the surface strength.
The additive for sludge hardening agent according to another embodiment of the present invention may include 90 to 99% by weight of the porous compound and 1 to 10% by weight of the surface solidifying agent.
This is a form in which sulfuric acid is not mixed as compared with the additive for sludge hardening agent according to the embodiment of the present invention described above. The reason why sulfuric acid is added to the porous compound is that the compound itself is acidic in aqueous solution, but by adding more strong acid component, it maximizes the effect of the neutralization reaction in the solidification treatment process of the sludge and increases the heat of neutralization to decrease the moisture content. . However, in summer, when the average annual temperature is high, there is basically an elevated temperature due to solar heat, so that the water content of the sludge can be reduced to a desired level only by the heat of neutralization reaction of the porous compound and the alkali-based solidifying agent without the addition of sulfuric acid.
The additive for sludge hardening agent consisting of only the porous compound and the surface solid agent can be prepared simply by adding the surface solid agent to the porous compound to form a granular mixture without mixing the porous compound and sulfuric acid.
The sludge solidification treatment method according to another embodiment of the present invention comprises the steps of mixing the above-mentioned additives for sludge solidifying agent and sludge solidifying agent; And adding sludge to the resultant mixture.
That is, the sludge solidification treatment method is a step for solidifying the sludge by the neutralization reaction of the sludge solidifying agent which is an acidic compound and the sludge solidifying agent which is an alkaline compound. Specifically, the additive for sludge solidifying agent and the sludge solidifying agent are dissolved in the water contained in the sludge, generate heat to 70 ° C. or more by neutralization reaction with acid and alkali, and solidify the sludge.
The sludge is a liquid or semi-solid liquid generated by precipitation of suspended solids in a process of treating sewage or wastewater. The sludge is less than 95% water or has a solid content of 5% or more to neutralize an acidic compound and an alkali compound. Anything that can be solidified by can be used without limitation. For example, the sludge may be one or more selected from the group consisting of sewage sludge, purified sludge, food waste, livestock waste, waste gypsum, dredged soil, marine sea shells, land ponds, and dredged soils.
In addition, the sludge hardener may be used as a compound capable of causing a neutralization reaction with the above-mentioned additives for sludge hardener, and may be used alone or in combination of two or more of calcium oxide, magnesium oxide, fly ash, quicklime, limestone and dolomite. .
At this time, the content of the additive for the sludge solidifying agent is 1 to 100 parts by weight, preferably 3 to 70 parts by weight, more preferably 5 to 50 parts by weight based on 100 parts by weight of the sludge solidifying agent.
In addition, the content of the sludge solidifying agent is 10 to 100 parts by weight, preferably 20 to 80 parts by weight, more preferably 30 to 60 parts by weight based on 100 parts by weight of sludge.
At this time, when the additive for sludge solidifying agent and the sludge solidifying agent are out of the above content range, sufficient neutralization reaction does not occur so that the water content of the sludge cannot be lowered, or the temperature of the sludge is greatly increased due to excessive neutralization reaction to decrease the water content. Sludge that has been solidified may become too hard to be suitable for use as cover material.
Therefore, as a result of the solidification treatment of the sludge, the rising temperature is 5 to 100 ° C, preferably 20 to 80 ° C, most preferably 40 to 50 ° C.
In addition, the water content of the solidified sludge is 5 to 60%, preferably 15 to 40%, most preferably 30 to 35%.
In this case, the step of mixing the sludge into the mixture of the additive for the sludge solidifying agent and the sludge solidifying agent, the pH is preferably carried out at 7 to 12.
When the sludge solidifying additive and the sludge solidifying agent are mixed with the result of adding sludge to the mixed product, water vapor is generated by the heat generated by the neutralization reaction, and in order to lower the water content of the sludge by smooth discharge of the water vapor, the mixed resultant The process of mixing the inner and outer layers of inverts may be carried out several more times.
Hereinafter, the present invention will be described in more detail with reference to the following examples. However, the following examples are only for illustrating the present invention, and the present invention is not limited by the following examples, and may be changed to other embodiments equivalent to substitutions and equivalents without departing from the technical spirit of the present invention. Will be apparent to those of ordinary skill in the art.
<Examples>
Preparation of additives for sludge hardening
Example 1-1
The sulfuric acid is absorbed to the inside of the porous compound by thoroughly mixing the porous compound (used by extracting sodium aluminum sulfate from KCC Co., Ltd.) (containing 100% by weight of sodium aluminum sulfate) and 95% sulfuric acid (Duksan Pharmaceutical Co., Ltd. reagent). Then, quicklime (made by Dry Industries Co., Ltd.) was added as a surface solidifying agent to solidify the surface of the porous compound to form a granular mixture. At this time, the content of the porous compound, sulfuric acid, and quicklime used are shown in Table 1 below.
Examples 1-2
Porous compounds (using Busan Gypsum from Taean Thermal Power Plant) (containing 100% by weight of calcium sulfate) and 95% sulfuric acid (Duksan Pharmaceutical Co., Ltd. reagent) are sufficiently mixed to absorb sulfuric acid to the inside of the porous compound, followed by quicklime as a surface solid agent ( Dry industry) was added to solidify the surface of the porous compound to form a granular mixture. At this time, the content of the porous compound, sulfuric acid, and quicklime used are shown in Table 1 below.
Example 1-3
Porous compound (product of KCC) (containing 100% by weight of silicon dioxide) and 95% of sulfuric acid (Duksan Pharmaceutical Co., Ltd. reagent) are sufficiently mixed to absorb sulfuric acid to the inside of the porous compound, followed by quicklime as a surface solid ) Was added to solidify the surface of the porous compound to form a granular mixture. At this time, the content of the porous compound, sulfuric acid, and quicklime used are shown in Table 1 below.
Examples 1-4 to 1-11
The porous compound (product of KCC) (containing 50% by weight of sodium aluminum sulfate, 25% by weight of calcium sulfate, and 25% by weight of silicon dioxide) and 95% of sulfuric acid (Duksan Pharmaceutical Co. Absorbed to the inside, and then quicklime (made by Dry Industries Co., Ltd.) as a surface solidifying agent was added to solidify the surface of the porous compound to form a granular mixture. At this time, the content of the porous compound, sulfuric acid, and quicklime used are shown in Table 1 below.
Example 1-12
The additive for sludge hardening agent was prepared by mixing the porous compound (product of KCC Co., Ltd.) (containing 100% by weight of sodium aluminum sulfate) and quicklime (product of the dry industry) with a surface solidifying agent to form a granular mixture of the surface of the porous compound. . At this time, the content of the porous compound, quicklime used is shown in Table 1 below.
Examples 1-13 and 1-14
Granules of which the surface of the porous compound is solidified by mixing the porous compound (product of KCC) (containing 50% by weight of aluminum aluminum sulfate, 25% by weight of calcium sulfate, and 25% by weight of silicon dioxide) with quicklime (product of KC) A mold mixture was formed to prepare an additive for sludge hardener. At this time, the content of the porous compound, quicklime used is shown in Table 1 below.
Comparative example 1-1
Sludge in the same manner as in Example 1-13, except that 70 g of porous compound (produced by KCC) (containing 50 wt% of sodium aluminum sulfate, 25 wt% of calcium sulfate, and 25 wt% of silicon dioxide) and 30 g of quicklime were used. An additive for solidifying agent was prepared.
Sludge Solidification Treatment
Examples 2-1 to 2-12
20 g of the additive for the sludge hardener prepared in Examples 1-1 to 1-14 and 180 g of the sludge hardener (90% by weight fly ash and 10% by weight quicklime) were mixed, and then the resultant of the mixing was sewage having an initial moisture content of 80%. Into the sludge 400g was stirred.
After 10 minutes of the completion of the stirring of the sludge, the rising temperature (° C) relative to the initial temperature was measured, the water content (%) of the sludge was measured after the completion of the stirring 5 hours, and the pH of the sludge was measured after the completion of the stirring 5 hours. In addition, the evaluation of the odor degree of the solidified sludge after 5 hours of the completion of the stirring of the sludge was determined by the sensory evaluation to give a score of 1 to 5 after 10 people absorbed the odor of the sludge (1 is No odor, 5 means odor is very serious). The measurement results are shown in Table 2 below.
Example 2-13 to 2-14
60 g of the additive for the sludge hardener prepared in Examples 1-13 to 1-14 and 140 g of the sludge hardener (90 wt% fly ash and 10 wt% of quicklime) were mixed, and the resulting mixture was then sewage having an initial moisture content of 80%. 400 g of sludge was added and stirred.
Table 2 shows the measurement results of elevated temperature, water content, pH, and odor of the solidified sludge obtained by treating in the same manner as in Example 2-1.
Comparative Example 2-1
The sludge was solidified in the same manner as in Example 2-1 except that the additive for sludge hardening agent prepared in Comparative Example 1-1 was used. Table 2 shows the measurement results of elevated temperature, water content, pH, and odor of the solidified sludge obtained by treating in the same manner as in Example 2-1.
Solidifying Additives
Solidifying Additives
As can be seen from Table 2, in the result of the solidification treatment of the sludge using the additive for sludge solidifying agent of Examples 1-1 to 1-14, the higher the sulfuric acid content in the additive for sludge solidifying agent, the higher the rising temperature, It is possible to confirm the tendency of the water content of the sludge is reduced, and the sludge treated according to Examples 2-1 to 2-14 is properly controlled the moisture content, pH and odor level, so that landfill or cover material recycling can be performed without the problem of secondary environmental pollution. It is possible. In particular, when the additives for sludge hardening agents of Examples 1-8 and 1-9 containing 70 g, 75 g, sulfuric acid 20 g, and 15 g of porous compounds, respectively (Examples 2-8 and 2-9), an elevated temperature of sludge Is in the range of 30 to 35 ℃, having a water content of about 30 to 35% it can be seen that the most suitable results for later use as a cover material.
On the other hand, in Comparative Example 2-1 in which the additive for sludge solidifying agent of 1-1 was applied to the comparison, sulfuric acid was not used and the content of the porous compound was not sufficient, so the pH of the treated sludge was 12.6, and the alkalinity was strong. There was not enough odor removal, which resulted in inadequate use as cover material.
Claims (7)
Adding a surface solid agent to the resultant mixture of the porous compound and sulfuric acid to form a granular mixture,
The porous compound contains at least one selected from the group consisting of sodium aluminum sulfate, calcium sulfate, and silicon dioxide, except that the porous compound is calcium sulfate alone,
The mixture of the porous compound and sulfuric acid and the surface solid agent is 50 to 98% by weight of the porous compound, 1 to 49% by weight of sulfuric acid and 1 to 20% by weight of the surface solidifying agent for the preparation method of the additive for the sludge hardener.
10 to 100 parts by weight of the sludge hardener and 0.1 to 100 parts by weight of the additive for sludge hardener according to any one of claims 1 to 4; And
Injecting the mixed result into 100 parts by weight of the sludge, and the step of stirring,
The sludge solidifying agent is a solidification treatment method of the sludge is at least one selected from the group consisting of calcium oxide, magnesium oxide, fly ash, quicklime, limestone and dolomite.
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| CN102976586A (en) * | 2012-12-19 | 2013-03-20 | 天津生态城环保有限公司 | Silt curing agent containing industrial waste carbide slag and curing method |
| KR101483658B1 (en) * | 2013-02-14 | 2015-01-16 | (주)하이콘코리아 | Method for Producing Artificial Granule From Organic and Inorganic Sludge and Apparatus for Producing the Same |
| CN107973503B (en) * | 2017-12-11 | 2023-03-28 | 浙江大学 | Integrated granular sludge sulfurization decalcification device and method |
| KR102642669B1 (en) * | 2023-08-21 | 2024-03-04 | (주)에스씨엠금영 | Grouting composition for eco-friendly ground injection |
| CN117602859B (en) * | 2023-10-10 | 2024-04-23 | 江苏集萃功能材料研究所有限公司 | Sludge building material treatment system and treatment method |
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| KR20060082544A (en) * | 2005-01-12 | 2006-07-19 | 고성룡 | Method of construction for stabilization of ground |
| KR100771490B1 (en) * | 2006-02-27 | 2007-10-30 | 주식회사 서울암면 | Manufacturing method of solidification agent for organic or inorganic waste resources |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| KR20060082544A (en) * | 2005-01-12 | 2006-07-19 | 고성룡 | Method of construction for stabilization of ground |
| KR100771490B1 (en) * | 2006-02-27 | 2007-10-30 | 주식회사 서울암면 | Manufacturing method of solidification agent for organic or inorganic waste resources |
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| KR20120002330A (en) | 2012-01-05 |
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