KR102231778B1 - Sewage sludge treatment method and system using SMR method - Google Patents

Abstract

The present invention provides a method and system for treating sewage sludge by applying a reduction scheme, that is, SMR scheme, in which organic sludge generated in a sewage treatment plant is separated and the separated sludge is decomposed into microorganisms and destroyed. According to the present invention, it is possible to efficiently separate organic matter from sewage sludge by adsorbing organic matter to a solvent and floating. In addition, by finally decomposing the separated organic sludge into water and carbon dioxide by microbial fermentation, the organic sludge itself can be reduced and eliminated. Therefore, by applying the SMR scheme as described above, it is possible to significantly reduce the use of harmful chemicals used in conventional sewage treatment, as well as minimize the recovery facility and recovery process according to the use of the drug, thereby reducing costs.

Description

Sewage sludge treatment method and system using SMR method {Sewage sludge treatment method and system using SMR method}

The present invention is a reduction method in which organic sludge generated in a sewage treatment plant is separated, and the separated sludge is decomposed by microorganisms, that is, a method of treating sewage sludge using the SMR method and its system. About.

More specifically, the SMR method is applied to the sewage sludge that has completed any one of the aerobic tank, sedimentation tank, concentration tank, and storage tank in the sewage treatment process to efficiently separate the organic sludge contained in the sewage and remove the separated organic sludge by microorganisms. The present invention relates to a method and system for treating sewage sludge by composting by treatment or decomposing into water and carbon dioxide to reduce and/or eliminate organic sludge itself.

In recent years, the development of a technology capable of efficiently treating sewage sludge is required as the unauthorized discharge or dumping of sewage sludge causing environmental pollution, such as a total ban on dumping of sewage sludge at sea, is prohibited.

Conventionally, a polymer coagulant is used to coagulate and precipitate organic sludge contained in sewage as a lump together with water. According to this treatment method, the specific gravity is separated and recovered into a mass of sludge of about 12.

However, the mass of sewage sludge separated by agglomeration of organic matter as described above still contains more than 80% moisture even after undergoing a mechanical dehydration process with a centrifugal separator, so reduction in weight is not sufficient. The main reason for not reducing the amount is that the outermost water outside the microorganisms is not easily dehydrated as the microfloc is bound to each other due to capillary phenomenon between the particle groups of organic sludge with a size of less than 150 um. .

In addition, there is a problem that secondary treatments such as heat treatment and dry incineration are required in order to meet the moisture content standards suitable for recycling or landfill treatment even after dehydration of the agglomerated and separated organic sludge by a mechanical method as described above.

Accordingly, there is a need to develop a technology for reducing and eliminating the organic sludge itself contained in sewage sludge.

Korean Patent Registration No. 10-1954139 Korean Patent Registration No. 10-1553073

An object of the present invention is to provide a method and a system for treating sewage sludge to which the SMR method is applied in order to solve the above problems.

In order to achieve the above object, the present invention is to separate the organic sludge existing in the sewage or water by introducing a non-polar alkane-based solvent into sewage or water to attach organic matter to the solvent, Organic sludge separation step (S110); A solvent recovery step (S120) of recovering an organic matter and an alkane-based solvent attached to the separated organic sludge; Water and carbon dioxide, which are final decomposition products generated in the organic matter decomposition step (S130) and the organic matter decomposition step (S130), in which the organic matter remaining after the solvent is recovered is fermented and dried with microorganisms, are discharged to sewage or waited by using a catalyst device. It provides a method for treating sewage sludge, including the step of discharging the decomposition product (S140), which is discharged to the inside.

The present invention also includes an organic sludge separation tank 100 for adsorbing organic substances in an alkane-based solvent to separate organic substances present in sewage from the outermost water in a floating manner; A solvent recovery device 200 for recovering an alkane-based solvent contained in the separated organic sludge; An organic material decomposition tank 300 for decomposing the organic sludge from which the solvent is recovered by treating it with microorganisms; And a catalyst device 400 for converting the decomposed product generated after the decomposition into water and carbon dioxide and discharging it into the atmosphere.

According to the method and system for treating sewage sludge of the present invention, organic matter is adsorbed to a solvent to float and float, thereby enabling efficient separation of organic matter from sewage sludge. In addition, by finally decomposing the separated organic sludge into water and carbon dioxide by microbial fermentation, the organic sludge itself can be reduced and destroyed.

In addition, by applying the SMR method as described above, the use of harmful chemicals used for conventional sewage treatment can be remarkably reduced, as well as minimizing the recovery facility and recovery process due to the use of chemicals, thereby reducing cost. Is big.

1 is a flow chart showing a sewage sludge treatment method to which the SMR method according to the present invention is applied.
2 is a flowchart showing a sewage sludge treatment system to which the SMR method according to the present invention is applied.
3 is a flow chart showing a conventional general sewage sludge treatment system.
4 is a schematic diagram showing a state in which organic matters are selectively adsorbed to an alkane-based solvent according to the present invention.

Hereinafter, a method and a system for treating sewage sludge using the SMR method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, a step-by-step look at a method of treating sewage sludge to which the SMR method according to the present invention is applied.

1 is a flow chart for a method of treating sewage sludge using the SMR method according to an embodiment of the present invention.

As shown in Figure 1, the sewage sludge treatment method according to the present invention, by injecting a non-polar alkane-based solvent into sewage or water, and attaching organic matter to the solvent, to float the organic sludge present in the sewage or water. Separating in a manner, organic sludge separation step (S110); A solvent recovery step (S120) of recovering an organic matter and an alkane-based solvent attached to the separated organic sludge; Water and carbon dioxide, which are final decomposition products generated in the organic matter decomposition step (S130) and the organic matter decomposition step (S130), in which the organic matter remaining after the solvent is recovered is fermented and dried with microorganisms, are discharged to sewage or waited by using a catalyst device. It includes a step of discharging the decomposition product (S140) to be discharged to the inside.

Here, the "organic sludge" refers to various organic wastes such as food waste, sludge of sewage and wastewater, processing waste of agricultural and livestock products such as milk sludge, food waste, slaughter waste, livestock manure, and the like.

According to the present invention as described above, a non-polar alkanes-based solvent is added to sewage sludge including sewage (water), various organic substances (microbial and organic sludge) as well as some other inorganic substances and heavy metals to efficiently separate organic substances and In addition to being extractable, the extracted organic matter may be treated with microorganisms to compost, or the organic matter may be decomposed into water and carbon dioxide to be destroyed.

In the description of each step, in the organic sludge separation step (S110), an alkanes-based solvent is introduced into the sewage sludge in order to separate organic substances present in the sewage sludge. As shown in FIG. 3, the alkanes-based solvent meets the organic matter and adsorbs the organic matter. And it floats to the upper layer by a lower specific gravity than the water (outermost water) existing in the sewage sludge, and at this time, it floats together with the adsorbed organic matter. Accordingly, organic matter present in the sewage can be floated and separated. The outermost water refers to the water remaining among organic matter in sewage sludge.

Meanwhile, the present invention may further include a pretreatment step (S110-P) before the organic sludge separation step (S110). In the pretreatment step (S110-P), a concentration detection step, an input amount detection step, a concentration control step and a stirring step in order to maintain the alkanes-based solvent (hereinafter referred to as'solvent') and the sewage sludge at an appropriate system value optimized for the treatment. It may include.

In the concentration detection step, the mixed liquor suspended solid (MLSS) concentration, which is the average concentration of the mixed liquor suspended solids in the sewage sludge, is detected, and in the input amount detection step, the input amount of the introduced solvent is determined according to the detected MLSS concentration. It is very important to keep the MLSS concentration of sewage sludge at the appropriate system value, and it is necessary to optimize the MLSS concentration, such as preventing complete combustion on the outside and incomplete combustion inside when burning solid fuel in an incinerator. For example, it is preferable that the MLSS concentration of sewage sludge is less than 10,000 [ppm]. If the MLSS concentration of sewage sludge exceeds 10,000 [ppm], it is difficult to selectively adsorb organic matter and alkanes-based solvents of sewage sludge as input raw materials.

Next, in the concentration control step, when the MLSS concentration of the sewage sludge does not satisfy the system appropriate value, the ratio of water to organic matter is adjusted so that the MLSS concentration of the sewage sludge is maintained at the appropriate system value. For example, when the MLSS concentration of sewage sludge exceeds 10,000 [ppm], water is added and diluted to less than 10,000 [ppm]. The water input to maintain an appropriate system value preferably recycles the outermost water separated in the organic sludge separation step (S110) and/or the crystal water separated in the organic matter concentration step (S120).

Next, in the stirring step, impurities contained in the sewage sludge are removed, and the sewage sludge is uniformly stirred in a stirrer equipped with various sensors. Here, contaminants mean solid substances that are not extracted by a solvent.

As described above, the sewage sludge input to the pretreatment step (S110-P) is preferably supplied from a sewage treatment plant. To this end, the system to which the present invention can be applied may be linked (or connected in parallel) with a sewage treatment plant facility.

Again, returning to the organic sludge separation step (S110), in the organic sludge separation step (S110), an alkane-based solvent is added to the sewage sludge to separate the organic sludge by a flotation method. At this time, the specific gravity of the solvent is lower than 1, and it is the principle that the solvent is separated from water as it rises to the upper layer of water along with the organic matter adsorbed in the separation tank. That is, the solvent in which organic sludge and microorganisms are adsorbed in the separation tank floats on the upper side and water is separated to the lower side. The water separated in the lower layer in the separation tank refers to the outermost water, and the present invention separates the water remaining between the particle groups of the organic sludge having a microfloc of less than 150 um. Since the outermost water is a polar material having an acid-base interaction force, it is possible to separate the outermost water, which was difficult to separate in the conventional mechanical dehydration method even when water particles act as a strong attraction. do. The outermost water separated in the organic sludge separation step (S110) is stored in a water storage tank, for example, and then supplied as process water to the pretreatment step (S110-P), or discharged to a sewage treatment plant as treated water from which organic matter is separated. . At this time, the outermost water does not change the water balance in the sewage treatment plant because there is no change in pH or properties compared to the state contained in the first sewage sludge, and can be used as process water to be recycled in the pretreatment step (S110-P). .

On the other hand, it is preferable that the non-polar alkane-based solvent added to the sewage sludge in the organic sludge separation step (S110) is present in a liquid state at atmospheric pressure and room temperature. When the solvent is liquid at atmospheric pressure and room temperature, it has excellent rheological properties in which the liquid solvent is diffused and uniformly dispersed between the sewage sludge, which is a medium, and thus has a very excellent solvent extraction effect compared to the case where the solvent is a solid.

The solvent is not particularly limited as long as it is an alkanes-based solvent having a specific gravity of less than 1, but may preferably be n=5 to 17 in the _{formula C n} H _2n+2. In the formula C _n H _2n+2 , n = 1 to 4 exist in a gaseous state at atmospheric pressure and room temperature, so the process is complicated, such as a problem that is difficult to inject into the sewage sludge or the solvent is not extracted and diffused into the atmosphere. It becomes. In addition, since n=18 or more exists in a solid state at atmospheric pressure and room temperature, there is a problem that the rheological properties of diffusion and uniform dispersion between sewage sludge are rapidly deteriorated, and the molecular weight is large and the length of the carbon ring is excessively long.

Therefore, it is not particularly limited if n=5 to 17, but according to the present invention, when an alkanes solvent of n=5 is used, the selective adsorption property with organic matter in the sewage sludge is the most excellent, so that the alkanes of n=5 It is more preferable to use a solvent. The alkane solvent of n=5 may include, for example, any one or more selected from n-pentane, isopentane, neopentane, and mixtures thereof. In particular, pentane and isopentein have the lowest molecular weight among liquid alkanes and have a small specific gravity of 0.6 to 0.7, so they have the best flotation ability after selective adsorption with organic matter. That is, it is possible to float and separate organic matter within a short residence period (R/T).

The organic sludge separated through the organic sludge separation step (S110) is subjected to a solvent recovery step (S120) for recovering the alkane solvent present in the sludge. In the solvent recovery step (S120), the solvent in which the organic matter separated from the sewage sludge is adsorbed is recovered and reused. Since the recovered solvent is in a liquid phase and a gaseous phase vaporized therefrom, the solvent recovery step S120 may include a liquid solvent recovery step and a gaseous solvent recovery step.

In the liquid solvent recovery step, the liquid solvent adhered to the organic sludge is separated and recovered using a dehydrator. A vacuum deaerator, a pressure deaerator, and a centrifugal deaerator may be used as the deaerator. In addition, in the gaseous solvent recovery step, while the organic sludge is separated from the sewage sludge using a liquid solvent, the gaseous solvent vaporized on the surface of the liquid solvent or in the air is recovered. To recover the gaseous solvent, the entropy of the gaseous solvent is increased by utilizing compressed air in the vaporization activator, and the collected gaseous solvent is sent to the condenser to be liquefied (condensed), and then supplied to an air cyclone device installed in the vaporization activator. . The liquid or gaseous solvent recovered in the solvent recovery step is stored in a solvent storage tank, and the stored solvent is supplied to the pretreatment step (S110-P) described above, or in some cases, directly to the organic sludge separation step (S110). May be supplied.

The organic sludge that has passed through the solvent recovery step (S120) is then fermented and dried by microorganisms to decompose organic matter (S130). At this time, the introduced microorganism may be used without limitation, as long as it is a breathable microorganism or an aerobic microorganism. Preferably it may be a Bacillus sp. strain, for example, Bacilus cereus, Bacilus thuringiensis, Bacilus subtlis, and a mixed strain thereof. Any one selected from the group consisting of may be mentioned.

In addition, in the microbial decomposition step (S130), the reduction of organic matter is in earnest by fermenting and drying the strains of the genus Bacillus listed above in the organic matter. At this time, the fermentation and drying conditions are preferably carried out by leaving the microorganisms at a temperature of -1 to 80° C. for 10 to 120 hours after adding the microorganisms, but the conditions are not limited thereto, and the conditions are different depending on the type of microorganisms to be introduced. can do. In the present invention, it is more preferable to carry out for 10 to 120 hours at a temperature of 30 to 70 ℃ that can most activate the proliferation of the Bacillus strain.

On the other hand, during the process of going through the microbial decomposition step (S130), organic matters are decomposed by microorganisms to generate harmful gases of ammonia components. Accordingly, in order to convert the gas into water and carbon dioxide, which are final decomposition products, and then discharge it, the decomposition product discharge step (S140) of discharging the gas through the treatment of the catalytic device proceeds. At this time, the catalyst device serves to remove odors generated during discharge by adsorbing harmful components such as ammonia.

Accordingly, the present invention enables the reduction of organic sludge by separating and decomposing the organic sludge through the above-described series of processes, that is, the SMR method.

In addition, the present invention provides a sewage sludge treatment system to which the SMR method is applicable.

2 is a flowchart of a sewage sludge treatment system to which the SMR method according to an embodiment of the present invention is applied. As shown in FIG. 2, the sewage sludge treatment system according to the present invention comprises: an organic sludge separation tank 100 for separating organic matter present in the sewage from the outermost water in a flotation manner by adsorbing organic matter to an alkanes-based solvent; A solvent recovery device 200 for recovering an alkane-based solvent contained in the separated organic sludge; An organic material decomposition tank 300 for decomposing the organic sludge from which the solvent is recovered by treating it with microorganisms; And a catalytic device 400 for converting the decomposition product generated after the decomposition into water and carbon dioxide and discharging it into the atmosphere.

When describing each component, the organic sludge separation tank 100 introduces an alkanes-based solvent into the sewage sludge in order to separate organic substances present in the sewage sludge. Alkane-based solvents encounter organic matter and adsorb organic matter, and then float to the upper layer by a lower specific gravity than water (outermost water) existing in the sewage sludge, and at this time, it is suspended together with the adsorbed organic matter. Accordingly, organic matter contained in the sewage sludge can be separated from the outermost water by a flotation method. The outermost water refers to the water remaining among organic matter in sewage sludge.

Meanwhile, the present invention may further include a pretreatment step (S110-P) before the organic sludge separation tank 100. In the pretreatment step (S110-P), a concentration detection device, an input amount detection device, a concentration control device, and a stirring device in order to maintain the alkane-based solvent (hereinafter referred to as'solvent') and the sewage sludge at an appropriate system value optimized for the treatment. It may include.

In the organic sludge separation tank 100, an alkanes-based solvent is added to the sewage sludge to separate the organic sludge by a flotation method. At this time, the solvent has a specific gravity lower than 1, which is a principle that the solvent is separated from water as it rises to the upper layer of water along with the organic matter adsorbed in the organic sludge separation tank 100. That is, in the organic sludge separation tank 100, a solvent adsorbed with organic sludge and microorganisms floats on the upper side and water is separated to the lower side. The water separated in the lower layer in the organic sludge separation tank 100 refers to the outermost water, and the present invention is the water remaining between the particle groups of the organic sludge having a microfloc size of less than 150 um. Is separated. Since the outermost water is a polar material having an acid-base interaction force, it is possible to separate the outermost water, which was difficult to separate in the conventional mechanical dehydration method even when water particles act as a strong attraction. do. The outermost water separated in the organic sludge separation tank 100 is stored in a water storage tank, for example, and then supplied as process water to the pretreatment step (S110-P), or discharged to a sewage treatment plant as treated water from which organic matter is separated. . At this time, the outermost water does not change the water balance in the sewage treatment plant because there is no change in pH or properties compared to the state contained in the first sewage sludge, and can be used as process water to be recycled in the pretreatment step (S110-P). .

On the other hand, it is preferable that the non-polar alkane-based solvent introduced into the sewage sludge in the organic sludge separation tank 100 is present in a liquid state at atmospheric pressure and room temperature. When the solvent is liquid at atmospheric pressure and room temperature, it has excellent rheological properties in which the liquid solvent is diffused and uniformly dispersed between the sewage sludge, which is a medium, and thus has a very excellent solvent extraction effect compared to the case where the solvent is a solid.

The solvent is not particularly limited as long as it is an alkanes-based solvent having a specific gravity of less than 1, but may preferably be n=5 to 17 in the _{formula C n} H _2n+2. In the formula C _n H _2n+2 , n = 1 to 4 exist in a gaseous state at atmospheric pressure and room temperature, so the process is complicated, such as a problem that is difficult to inject into the sewage sludge or the solvent is not extracted and diffused into the atmosphere. It becomes. In addition, since n=18 or more exists in a solid state at atmospheric pressure and room temperature, there is a problem that the rheological properties of diffusion and uniform dispersion between sewage sludge are rapidly deteriorated, and the molecular weight is large and the length of the carbon ring is excessively long.

Therefore, it is not particularly limited if n=5 to 17, but according to the present invention, when an alkanes solvent of n=5 is used, the selective adsorption property with organic matter in the sewage sludge is the most excellent, so that the alkanes of n=5 It is more preferable to use a solvent. The alkane solvent of n=5 may include, for example, any one or more selected from n-pentane, isopentane, neopentane, and mixtures thereof. In particular, pentane and isopentein have the lowest molecular weight among liquid alkanes and have a small specific gravity of 0.6 to 0.7, so they have the best flotation ability after selective adsorption with organic matter. That is, it is possible to float and separate organic matter within a short residence period (R/T).

The organic sludge separated through the organic sludge separation tank 100 is introduced into a solvent recovery device 200 for recovering an alkanes solvent present in the sludge. The solvent recovery device 200 recovers and reuses a solvent in which organic matter separated from sewage sludge is adsorbed. Since the recovered solvent is in a liquid phase and gaseous vaporized therefrom, the solvent recovery device 200 may include a liquid solvent recovery device and a gas solvent recovery device.

As a liquid solvent recovery device, a liquid solvent adhering to the organic sludge is separated and recovered using a dehydrator. A vacuum deaerator, a pressure deaerator, and a centrifugal deaerator may be used as the deaerator. In addition, in the gaseous solvent recovery apparatus, the gaseous solvent vaporized in the air or the surface of the liquid solvent is recovered while the organic sludge is separated from the sewage sludge using a liquid solvent. To recover the gaseous solvent, the entropy of the gaseous solvent is increased by utilizing compressed air in the vaporization activator, and the collected gaseous solvent is sent to the condenser to be liquefied (condensed), and then supplied to an air cyclone device installed in the vaporization activator. . The liquid or gaseous solvent recovered from the solvent recovery device is stored in a solvent storage tank, and the stored solvent is supplied to the pretreatment step (S110-P) described above, or in some cases, directly to the organic sludge separation tank 100. May be supplied.

The organic sludge passed through the solvent recovery device 200 is then introduced into the organic matter decomposition tank 300, which is fermented and dried by microorganisms. At this time, the introduced microorganism may be used without limitation, as long as it is a breathable microorganism or an aerobic microorganism. Preferably it may be a Bacillus sp. strain, for example, Bacilus cereus, Bacilus thuringiensis, Bacilus subtlis, and a mixed strain thereof. Any one selected from the group can be mentioned.

In addition, by fermenting and drying the above-listed Bacillus strains in the organic matter decomposition tank 300, the reduction of organic matter is in earnest. At this time, the fermentation and drying conditions are preferably carried out by leaving the microorganisms at a temperature of -1 to 80° C. for 10 to 120 hours after adding the microorganisms, but the conditions are not limited thereto, and the conditions are different depending on the type of microorganisms to be introduced. can do. In the present invention, it is more preferable to carry out for 10 to 120 hours at a temperature of 30 to 70 ℃ that can most activate the proliferation of the Bacillus strain.

On the other hand, during the organic matter decomposition process in the organic matter decomposition tank 300, the organic matter is decomposed by the microorganism to generate harmful gas of ammonia component. Accordingly, in order to convert the gas into water and carbon dioxide, which are final decomposition products, and then discharge it, the decomposition product discharge step (S140) of discharging the gas through the treatment of the catalytic device proceeds. At this time, the catalyst device serves to remove odors generated during discharge by adsorbing harmful components such as ammonia.

As shown in FIG. 3, in a conventional sewage treatment plant, a chemical treatment tank 10, an aerobic tank 20, a settling tank 30, a concentration tank 40, a storage tank 50, and a dewatering device 60 are typically built as basic facilities. , These processes proceed sequentially.

Looking at each process, the aerobic tank 20 biologically treats the sewage sludge that has been chemically treated in the chemical treatment tank 10. This aerobic tank 20 is also referred to as an aeration tank, and when treating sewage by the activated sludge method, air (aeration) is supplied to treat organic matter using microorganisms. In addition, the treated water discharged from the aerobic tank 20 is treated by a settling tank 30. The aerobic tank 20 receives the returned sludge from the subsequent settling tank 30, and the remaining excess sludge is supplied to the thickening tank 40. Excess sludge refers to sewage sludge excluding return sludge used as nutrients (carbon components) necessary for maintaining the microbial ecosystem in the aerobic tank 20. In addition, in order to control the excessive inflow of the treated water discharged from the concentration tank 40, it is stored in the storage tank 50.

As described above, unlike the conventional sewage sludge flowing into the chemical treatment tank 10 to complete the treatment, followed by the aerobic tank 20, the settling tank 30, the thickening tank 40, and the storage tank 50, followed by sequential treatment. , As shown in FIG. 2, after the sludge treated in the chemical treatment tank 10 among these facilities is treated in any one of the aerobic tank 20, the settling tank 30, the thickening tank 40, and the storage tank 50, , It can be put into the organic sludge separation tank 100 without going through the dewatering device 60.

Therefore, if the system to which the present invention can be applied is installed to be linked to the existing sewage treatment plant facilities or installed in parallel, a dewatering device subsequently installed in the aerobic tank 20, the sedimentation tank 30, the thickening tank 40, or the storage tank 50 ( 60) shut down or become unnecessary. Furthermore, if a new sewage treatment plant is installed, the dewatering device 50 can be omitted.

That is, even if the sewage sludge generated in the conventional sewage treatment plant is reduced by a mechanical method, additional heat treatment, drying, and incineration processes are required because it contains a lot of moisture in the sludge, but according to the present invention, a separate reduction process after dehydration (mechanical Dehydration and thermal drying, etc.), recycling (recovery) process and landfill process according to the use of chemicals or functional materials can be omitted by replacing them with one process, thereby greatly simplifying the process.

In the above, specific embodiments of the present invention have been described above. However, the spirit and scope of the present invention are not limited to these specific embodiments, but various modifications and variations are possible within the scope of not changing the gist of the present invention. You will understand when you grow up.

Therefore, the embodiments described above are provided to completely inform the scope of the invention to those of ordinary skill in the technical field to which the present invention belongs, and should be understood as illustrative and non-limiting in all respects, The invention is only defined by the scope of the claims.

10: chemical treatment tank 20: aerobic tank
30: settling tank 40: concentration tank
50: storage tank 60: dewatering device
100: organic sludge separation tank 200: solvent recovery device
300: organic matter decomposition tank 400: catalyst device

Claims (15)

Separating organic sludge from the outermost water in a floating method by introducing a non-polar alkane-based solvent into sewage or water, attaching organic matter to the solvent, and separating organic sludge existing in sewage or water from the outermost water (S110) );
A solvent recovery step (S120) of recovering an organic matter and an alkane-based solvent attached to the separated organic sludge;
The organic matter decomposition step (S130) of fermenting and drying the organic matter remaining after the solvent is recovered with microorganisms, and
Including a decomposition product discharging step (S140) of converting the decomposition product generated in the organic matter decomposition step (S130) into water and carbon dioxide as final decomposition products using a catalytic device and then discharging it to the atmosphere,
In the organic matter decomposition step (S130), a Bacilus thuringiensis strain is added to the organic matter, and fermentation and drying are performed at a temperature of -1 to 80° C. for 10 to 120 hours, thereby converting the organic matter into a final decomposition product. Treatment method of sewage sludge, characterized in that to let.
The method of claim 1,
The organic sludge separation step (S110) is an alkanes-based solvent that satisfies n=5 to 17 in the _{formula C n} H _{2n+2, a method of treating sewage sludge.}
The method of claim 2,
The alkanes-based solvent is any one selected from the group consisting of n=5 pentane, isopentane, neopentane, and mixtures thereof.
The method of claim 1,
The solvent recovery step (S120) is to separate the solvent attached to the organic material using a dehydrator, a method of treating sewage sludge.
delete delete delete An organic sludge separating tank 100 for adsorbing organic substances in an alkane-based solvent and separating organic substances present in sewage from the outermost water in a floating method;
A solvent recovery device 200 for recovering an alkane-based solvent contained in the separated organic sludge;
An organic material decomposition tank 300 for decomposing the organic sludge from which the solvent is recovered by treating it with microorganisms; And
A catalyst device 400 for converting the decomposition product generated after the decomposition into water and carbon dioxide and discharging it into the atmosphere,
Sewage sludge introduced into the organic sludge separation tank 100 is a chemical treatment tank 10, aerobic tank 20, a settling tank 30, a concentration tank 40, a storage tank 50 and dewatering which are sequentially installed in a sewage treatment plant. After being treated in the chemical treatment tank 10 of the apparatus 60, it is treated through any one of the aerobic tank 20, the precipitation tank 30, the concentration tank 40, and the storage tank 50,
In the organic matter decomposition tank 300, a Bacilus thuringiensis strain is added to the decomposition tank, and fermentation and drying are performed at a temperature of -1 to 80° C. for 10 to 120 hours, thereby converting the organic sludge into water and carbon dioxide. Sewage sludge treatment system, characterized in that the conversion.
delete The method of claim 8,
The alkane-based solvent introduced into the organic sludge separation tank 100 satisfies n=5 to 17 in the _{formula C n} H _{2n+2, a sewage sludge treatment system.}
The method of claim 10,
The alkanes-based solvent is any one selected from the group consisting of n=5 in the _{formula C n} H _{2n+2, pentane, isopentane, neopentane, and mixtures thereof.} Phosphorus, sewage sludge treatment system.
The method of claim 8,
The solvent recovery device 200 is to recover the solvent by using a dehydrator to separate the solvent adsorbed on the organic matter, sewage sludge treatment system.
delete delete delete

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