WO2020138778A1 - 다단 분리 반응조 및 그를 이용한 알케인 계열 용매를 이용한 하수 슬러지 처리 방법 - Google Patents
다단 분리 반응조 및 그를 이용한 알케인 계열 용매를 이용한 하수 슬러지 처리 방법 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/002—Sludge treatment using liquids immiscible with water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/121—Multistep treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1205—Particular type of activated sludge processes
- C02F3/1215—Combinations of activated sludge treatment with precipitation, flocculation, coagulation and separation of phosphates
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1278—Provisions for mixing or aeration of the mixed liquor
- C02F3/1284—Mixing devices
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/20—Activated sludge processes using diffusers
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/02—Biological treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/10—Solids, e.g. total solids [TS], total suspended solids [TSS] or volatile solids [VS]
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/20—Sludge processing
Definitions
- the present invention relates to a multi-stage separation reaction tank for treating sewage sludge by forming a collection layer, a diffusion layer, a primary buffer layer, a secondary buffer layer, and an inorganic precipitate layer when treating an organic material by adding a liquid solvent having a specific gravity less than water to the sewage sludge. .
- the present invention relates to a method for treating sewage sludge using an alkane-based solvent that significantly lowers the water content of the sewage sludge using a non-polar alkane-based solvent that is in a liquid state at atmospheric pressure and room temperature.
- the wastewater sludge mass separated by agglomeration of the organic matter including microorganisms as described above is still not sufficiently reduced because it still contains 80% or more of moisture even through a mechanical dehydration process with a centrifuge.
- the first reason why the weight was not reduced is that the outermost water outside the microorganism cannot be easily dehydrated as the microfloc is bound to each other by capillarity between the particle groups of organic sludge having a size less than 150um. .
- the second reason why the weight is not reduced is because the microorganisms present in the sewage are not destroyed, and the crystalline water (internal water) existing inside the microorganisms accounts for about 40% of the total water remaining in the sewage sludge after coagulation treatment. do.
- Korean Patent Publication No. 2015-0056429, Korean Patent Publication No. 2015-0056472, and Korean Patent Publication No. 2015-0056473 use hydrocarbon-based organic solvents to extract and separate organic substances from sewage sludge to further lower the water content. .
- the hydrocarbon-based organic solvent used in the related art has a limitation in lowering the total water content because it is not evenly diffused into the entire organic sludge upon input because it is in a solid state at atmospheric pressure and normal temperature.
- the hydrocarbon-based organic solvent used in the related art has a relatively long carbon chain, which is disadvantageous in terms of rheology, and has a low selective adsorption rate of organic substances present in sewage sludge.
- a hydrocarbon-based organic solvent is mixed and introduced into a separation reaction tank 50 for the treatment of sewage sludge, whereby a mixture layer 56 composed of an organic solvent and sewage sludge is 56 To form.
- the upper portion of the mixture layer 56 is a hydrocarbon-based organic solvent having a smaller specific gravity than water and the organic material to which the organic solvent is attached is floating to form a collection layer 57, and the lower layer of the mixture has a heavy specific gravity of water and inorganic substances.
- the sedimentation layer 55 is formed by sinking.
- the ideal (ideal) is the separation layer 50 in the separation layer (50), based on the mixture layer 56, respectively, the collection layer (57) containing an organic material and the precipitation layer (55) containing an inorganic material is clearly bounded And must be separated.
- the collection layer 57 and the precipitation layer 55 are not clearly distinguished above and below the mixture layer 56 due to various reasons including interlayer diffusion, convection, and mixing, and thus the efficiency of organic matter treatment (separation) is low. .
- the present invention is to solve the above-mentioned problems, and when the organic material is treated by adding a liquid solvent having a specific gravity less than water to the sewage sludge, a sewage sludge is formed by forming a collection layer, a diffusion layer, a primary buffer layer, a secondary buffer layer, and an inorganic precipitation layer. It is intended to provide a multi-stage separation reactor to treat the.
- the present invention is to provide a method for treating sewage sludge using an alkane-based solvent that significantly lowers the water content of sewage sludge by using a non-polar alkane-based solvent in a liquid state at atmospheric pressure and room temperature.
- the multi-stage separation reaction tank in which a liquid solvent having a specific gravity smaller than water is introduced into a sewage sludge containing water, organic substances and inorganic substances, and a treatment tank body having a receiving space therein;
- a first connection pipe connected to an upper portion of the reactor body;
- a second connection pipe connected to the reaction vessel body and disposed below the first connection pipe;
- a third connection tube connected to the reaction vessel body and disposed below the second connection;
- a mixing device for supplying a mixture of the liquid solvent and sewage sludge into the reaction vessel body through the first connection pipe;
- a solvent spraying device for spraying liquid solvent droplets into the reaction vessel body through the second connection pipe;
- an aeration device for spraying air bubbles into the reaction vessel body through the third connection tube, including a diffusion layer through which the liquid solvent and sewage sludge are diffused by the mixture supplied through the first connection tube,
- the liquid solvent and the organic material are suspended from the diffusion layer to form a collection layer on the upper portion of
- the method of treating a sewage sludge using an alkane-based solvent according to the present invention is to extract and process organic substances from the sewage sludge using the multi-stage separation reaction tank as described above, wherein the alkane-based solvent is added to the sewage sludge.
- the solvent introduced in the organic matter separation step is a solvent that exists in a liquid state at atmospheric pressure and room temperature among the alkane-based solvents, and microorganisms and organic sludge attached to the solvent are suspended above the water by a solvent having a specific gravity of less than 1. It is characterized by being separated from water.
- the pre-treatment step is a concentration detection step of detecting the mixed liquor suspended solid (MLSS) concentration, the average suspended solids concentration for the sewage sludge; And an input amount detection step of determining an input amount of the injected solvent according to the detected MLSS concentration.
- MLSS mixed liquor suspended solid
- the pre-treatment step further includes a concentration control step of diluting the MLSS concentration of the sewage sludge to less than 5,000 [ppm], either the outermost water separated in the organic matter separation step or the crystalline water separated in the organic matter concentration step
- concentration control step of diluting the MLSS concentration of the sewage sludge to less than 5,000 [ppm], either the outermost water separated in the organic matter separation step or the crystalline water separated in the organic matter concentration step.
- the sewage sludge introduced in the organic material separation step is preferably a sewage sludge that has been treated in the aerobic tank, sedimentation tank or concentration tank among chemical treatment tanks, aerobic tanks, sedimentation tanks, concentration tanks and dehydration devices sequentially installed in a sewage treatment plant. .
- the present invention forms a collection layer, a diffusion layer, a primary buffer layer, a secondary buffer layer, and an inorganic precipitation layer when treating an organic material by adding a liquid solvent having a specific gravity less than water to the sewage sludge. Therefore, it is possible to separate the layers by the primary buffer layer and the secondary buffer layer, respectively.
- the present invention significantly lowers the water content of sewage sludge by using a non-alkaline solvent that is liquid and non-polar under atmospheric pressure and room temperature. Therefore, despite the capillary phenomenon between the small-sized organic matter, the organic matter is adsorbed to the solvent and separated from the water, and an extraction reaction occurs between the sewage sludges by the liquid solvent.
- the non-polar solvent penetrates the phospholipid bilayer constituting the cell membrane of the microorganism through simple diffusion, and the cell membrane of the microorganism is destroyed by the pressure of the solvent diffused into the microorganism, the water inside the microorganism is separated and removed.
- FIG. 1 is a view showing the layer structure of a separation reactor according to the prior art.
- Figure 2 is a flow chart showing a sewage sludge treatment method using an alkane-based solvent according to the present invention.
- FIG. 3 is a view showing a sewage sludge treatment system to which the present invention is applicable.
- FIG. 4 is a view showing a state in which an organic material is selectively adsorbed to the solvent of the present invention.
- FIG. 5 is a view showing a multi-stage separation reaction tank according to the present invention.
- the separation reaction tank according to the present invention is only optimized for the sewage sludge treatment method using the alkane-based solvent according to the present invention, and can be applied to other liquid solvents.
- the method for treating sewage sludge using an alkane-based solvent includes an organic material separation step (S110) and an organic material concentration step (S120).
- the preferred embodiment may further include a solvent recovery step (S130) after the organic substance concentration step (S120), and a pretreatment step (S110-P) before the organic substance separation step (S110).
- the present invention extracts and treats organic substances such as microorganisms and organic sludge by adding an alkane-based solvent to sewage sludge (or slurry) containing water, microorganisms, and organic sludge as well as some other inorganic and heavy metals. .
- the organic material separation step (S110) the organic material is separated from the outermost water contained in the sewage sludge as the organic material is adsorbed and suspended in the alkane-based solvent.
- the outermost water refers to the water remaining between organic substances in the sewage sludge.
- the cell membrane of the microorganism is destroyed by the pressure and the crystal water (body water) remaining inside the microorganism is leaked to the outside, so that the crystal water and the organic material It is separated.
- the solvent adsorbed on the organic matter separated from the water is recovered and reused.
- the recovered solvent has a liquid phase and a gas phase vaporized therefrom, as described later.
- an alkane-based solvent hereinafter, referred to as'solvent'
- sewage sludge is maintained at an optimal system value for the treatment.
- it includes a concentration detection step, an input amount detection step, a concentration control step and a stirring step.
- the mixed liquor suspended solid (MLSS) concentration which is the average suspended solids concentration for the sewage sludge, is detected, and in the input detection step, the input amount of the solvent to be input is determined according to the detected MLSS concentration as above.
- the MLSS concentration of the sewage sludge is less than 5,000 [ppm]. If the MLSS concentration of the sewage sludge exceeds 5,000 [ppm], it is difficult to selectively adsorb the organic material of the input raw material sewage sludge and the alkane-based solvent.
- the concentration control step if the MLSS concentration of the sewage sludge does not satisfy the system appropriate value, the ratio of water to organic matter is adjusted to maintain the MLSS concentration of the sewage sludge again at the system appropriate value.
- the water input to maintain the system proper value preferably recycles the outermost water separated in the organic material separation step (S110) and/or the crystalline water separated in the organic material concentration step (S120).
- the contaminant means a solid material or the like that is not extracted by a solvent.
- the sewage sludge input to the pretreatment step (S110-P) is supplied from an existing sewage treatment plant.
- the system to which the present invention is applicable can be linked (or connected in parallel) to existing sewage treatment plant facilities.
- the chemical treatment tank 10, the exhalation tank 20, the sedimentation tank 30, the concentration tank 40, and the dewatering device 50 are generally constructed as basic facilities in the sewage treatment plant.
- the present invention can be introduced into the organic matter separation step (S110) described below after pre-treatment of the sewage sludge after treatment in the aeration tank 20 or sedimentation tank 30 of these facilities.
- the sewage sludge after treatment in the concentration tank 40 may be introduced.
- the aerobic tank 20 biologically treats the sewage sludge after the chemical treatment in the chemical treatment tank 10.
- the aerobic tank 20 is also called an aeration tank, and air (aeration) is supplied to treat organic materials using microorganisms when treating sewage by an activated sludge method.
- the exhalation tank 20 receives the return sludge from the subsequent precipitation tank 30 and supplies the remaining excess sludge to the concentration tank 40.
- Surplus sludge is sewage sludge excluding return sludge used as nutrient (carbon component) necessary for maintaining the microbial ecosystem in the aerobic tank 20.
- the sewage sludge of the exhalation tank 20 is usually input only after removing and stirring the debris immediately without adjusting the concentration of the sewage sludge, because the MLSS concentration is less than 5,000 [ppm]. Of course, if the MLSS concentration exceeds 5,000 [ppm], the number of processes can be added to lower the MLSS concentration.
- the MLSS concentration in the aerobic tank 20 can be monitored using an MLSS concentration meter installed in the sewage treatment plant.
- the MLSS densitometer may use an energy attenuation method using an ultrasonic attenuation method and an envelope signal, which monitors each facility of a sewage treatment plant.
- Sewage sludge in the sedimentation tank 30 is usually MLSS concentration of 20,000 [ppm] or more, so, as described above, the process water (ie, the outermost water and/or crystal water) is diluted with it, and the MLSS concentration is 5,000 [ ppm] before use.
- the MLSS concentration of the sewage sludge after treatment in the concentration tank 40 may be adjusted to less than 5,000 [ppm] and used.
- the concentration tank 40 or the dehydration device 50 subsequently installed in the exhalation tank 20 and the precipitation tank 30 is operated. It can be interrupted or made unnecessary.
- the MLSS concentration is relatively high, the efficiency may be somewhat lower, but in the case of treating the sewage sludge that has passed through the concentration tank 40, it is possible to stop or unnecessary the operation of only the dewatering device 50, which is a subsequent process.
- an alkane-based solvent is added to the sewage sludge to separate microorganisms and organic sludge attached to the solvent from the outermost water existing outside the microorganism. .
- the separation tank ( In 100), as shown in Figure 4, the organic material is selectively adsorbed to the solvent.
- Organic matter includes organic sludge and microorganisms.
- a solvent having a specific gravity of less than 1 is separated from water as it rises as an upper layer of water together with organic substances in the separation tank 100. That is, the solvent in which the organic sludge and microorganisms are adsorbed in the separation tank 100 is floating on the upper side and water is separated on the lower side.
- the water separated in the lower layer in the separation tank 100 refers to the outermost water as described above, and is separated from the crystalline water (internal water) inside the microorganism, and the present invention provides an organic sludge having a particle group (microfloc) size less than 150um. The remaining water is separated between the particle groups.
- the outermost water is a polar substance 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 exert strong attraction. To do.
- the outermost water separated in the organic material separation step (S110) is stored in a water storage tank (S111), for example, and then supplied as process water to the pretreatment step (S110-P) or sewage as treated water from which the organic material is separated. It is discharged to the treatment plant.
- 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 it can be used as process water to recycle in the pretreatment step (S110-P). .
- the alkane-based solvent introduced together with the sewage sludge in the organic material separation step (S110) is preferably an alkane-based solvent present in a liquid state at atmospheric pressure and room temperature among the alkane-based.
- the liquid solvent When the solvent is a liquid at atmospheric pressure and normal temperature, the liquid solvent has excellent rheological properties that are diffused and uniformly dispersed between the sewage sludges as a medium, and thus has a very excellent solvent extraction effect compared to when the solvent is a solid.
- N-PENTANE has a specific gravity of 0.6 to 0.7.
- the present invention selects N-PENTANE or its isomer having the best selective adsorption properties with organic substances in sewage sludge due to the shortest and simplest carbon ring among the alkane-based solvents present in a liquid state at atmospheric pressure and room temperature. .
- N-PENTANE and isomers have the smallest molecular weight among liquid alkanes and have a specific gravity of 0.6 to 0.7, so they have the best floating ability after selective adsorption with organic substances, resulting in floating organic substances within a short residence period (R/T). And separation.
- FIG. 5 shows a multi-stage separation reaction tank according to the present invention.
- a liquid solvent is used to facilitate diffusion and acceleration in sewage sludge mixed with water, and there is no particular limitation on the applicable solvent if it can be attached to the organic material and float upward.
- the solvent applied to the multi-stage separation reaction tank 100 of the present invention is a non-polar alkane-based solvent, and the smaller the specific gravity is, the more preferable.
- the present invention is to treat the organic material by injecting a liquid solvent having a specific gravity less than water to the sewage sludge containing water, organic and inorganic materials, the reaction tank body 110, the first connector 120, the 2 includes a connecting pipe 130, a third connecting pipe 140, a mixing device 150, a solvent injection device 160 and an aeration device 170.
- the reaction tank body 110 is a single reaction tank having a receiving space therein, and as described later, five layers 111 to 115 are stacked from the bottom to the top. The five layers are divided into Layer 1 to Layer 5 and separated according to specific gravity.
- the first connection pipe 120 to the third connection pipe 140 connected to one side of the reaction vessel body 110 form water in order to divide the inorganic material of the lowest layer and the organic material of the uppermost layer by forming the multi-level separated layers 111 to 115 as above. , Sewage sludge, solvent and air are injected.
- the mixing device 150, the solvent injection device 160, and the aeration device 170 are for treating the injected water, sewage sludge, solvent and air, as described above, and a solvent (for example, alkane solvent) and sewage sludge. And the solvent or air to form bubbles.
- a solvent for example, alkane solvent
- the first connector 120 is connected to the upper portion of the reaction tank body 110 having an accommodation space therein, and the second connector 130 is disposed below the first connector 120.
- the third connector 140 is disposed below the second connector.
- the first connector 120 is a layer 4 diffusion layer ( 114).
- the second connector 130 is located on the primary buffer layer 113, which is Layer 3
- the third connector 140 is located on the secondary buffer layer 112, which is Layer 2.
- the mixing device 150 supplies a mixture of liquid solvent and sewage sludge into the reaction vessel body 110 through the first connection pipe 120.
- the mixing device 150 may be an inline mixer.
- the line mixer includes a circulation mixing device and a solvent input mixing device.
- the circulating mixing device facilitates uniform dispersion and simple separation of organic substances in sewage sludge.
- the solvent input mixing device is used for solvent adsorption and uniform dispersion of organic matter.
- the solvent injection device 160 injects a liquid solvent droplet into the reaction vessel body 110 through the second connection pipe 130. To this end, the solvent injection device 160 receives and sprays a solvent from a storage tank that supplies, for example, an alkane-based solvent.
- the injected solvent forms a submicron or nano-sized chemical droplet.
- it is sprayed evenly over the entire primary buffer layer 113, but is stably sprayed to minimize sloshing.
- the aeration device 170 injects air bubbles into the reaction vessel body 110 through the third connector 140.
- the aeration device 170 includes an external air intake fan, an air bubble generator, and the like, and generates sub-micron or nano-sized air bubbles.
- the diffusion layer 114 in which the liquid solvent and the sewage sludge are diffused is formed by the mixture supplied through the first connection pipe 120, and the liquid solvent and the organic material are suspended from the diffusion layer 114 to diffuse the diffusion layer 114. ), the collecting layer 115 is formed on the top.
- the primary buffer layer 113 is formed under the diffusion layer 114 by the liquid solvent droplets injected through the second connection pipe 130, and the air bubbles injected through the third connection pipe 140 are primary.
- the second buffer layer 112 is formed by being supplied to water and inorganic substances sinking to the lower portion of the buffer layer 113.
- An inorganic precipitation layer 111 is formed below the secondary buffer layer 112 as described above.
- the inorganic sedimentation layer 111 is stacked and separated from the secondary buffer layer 112 with air bubbles sprayed through the aeration device 170, and water and inorganic substances are settled.
- water and inorganic substances having a high specific gravity are precipitated in the inorganic precipitate layer 111 of the lowermost layer, and organic substances are attached to a solvent having a small specific gravity to the collecting layer 115 of the uppermost layer to float together, and by multiple layers therebetween. They are clearly separated from each other.
- the primary buffer layer 113 is formed on the lower portion based on the diffusion layer 114 in which the solvent and sewage sludge are mixed, organic substances and solvents are attached by solvent droplets evenly distributed in the primary buffer layer 113. And/or are invaded and no longer go downstairs and ascend upward.
- the secondary buffer layer 112 there is a secondary buffer layer 112 at the top and an inorganic precipitation layer 111 at the bottom, some organic substances and solvents diffused from the primary buffer layer 113 and descended to the lower layer. Is attached and/or entrapped and can no longer go downstairs and rises upward.
- the present invention can prevent the interlayer diffusion, convection, and miscibility, so that the collection layer 115 and the inorganic precipitation layer 111 can be clearly distinguished, and thus the efficiency of organic matter treatment (separation) is greatly improved.
- the entrainment bypass in the collection layer 115 and the inorganic sedimentation layer 111 is set to be less than 5%, respectively, so that the separation efficiency curve in the multi-stage separation reaction tank 100 is ideal compared to an error. (misplacement) should be less than 10%.
- the first discharge pipe 116 and the second discharge pipe 117 which are not described above, are connected to the uppermost collecting layer 115 and the lowermost inorganic precipitation layer 111, respectively. Therefore, the solvent and organic substances are separated and discharged through the first discharge pipe 116, and water and inorganic substances are separately discharged through the second discharge pipe 117.
- the organic material concentration step (S120) diffuses a non-polar solvent into the interior of the microorganism to induce destruction of the cell membrane of the microorganism by expansion and remains inside the microorganism by destruction of the cell membrane.
- the used crystal water is discharged to the outside to separate.
- the organic material separation step (S110) is performed in the separation tank 100, the sludge composed of the microorganisms, the organic sludge, and the solvent in which the outermost water is separated is sent to the concentration tank 4, and the crystallized water in the concentration tank 4 is sent.
- a step for separation proceeds.
- the water content of the sewage sludge exceeds 80%, and among them, the crystal water inside the microorganism occupies 40%.
- the present invention uses a non-polar alkane-based solvent that is easily diffused into the cell membrane.
- n-PENTANE and isomers of n 5, which is liquid at room temperature and has the shortest carbon ring, are used.
- the present invention is a non-polar, liquid at room temperature, and a simple diffusion is carried out through the cell membrane of a microorganism composed of a phospholipid bilayer using a solvent having a short carbon ring, thereby destroying the cell membrane of the microorganism by the resulting pressure.
- the crystalline water (body water) existing therein is separated from the solvent, and the crystalline water having a higher specific gravity than the solvent sinks to the bottom, and the organic matter adsorbed on the remaining solvent floats on the upper side and becomes crystalline water. Is separated.
- Crystal water separated in the organic material concentration step (S120) is stored in a water storage tank (S121), for example, and then supplied as process water to the pre-treatment step (S110-P), or as a treated water from which the organic material is separated. Is discharged. The sludge from which the crystal water has escaped becomes concentrated.
- the crystalline water also 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 recycle in the pretreatment step (S110-P). Do.
- the solvent that has been subjected to the organic material separation step (S110) and the organic material concentration step (S120) is collected by being input together with the sewage sludge in the above-described pretreatment step (S110-P).
- the solvent recovery step (S130) includes a liquid solvent recovery step (S131) for recovering the liquid solvent. Furthermore, as a preferred embodiment, in addition to the recovery of the liquid solvent, a gas solvent recovery step (S132) of recovering the gas solvent is included.
- the liquid solvent attached to the microorganisms and organic sludge is separated and recovered using a degasser.
- a degasser such as vacuum degassers, pressure degassers and centrifugal degassers, can be used.
- the liquid solvent recovered in the liquid solvent recovery step (S131) is stored in a solvent storage tank (S131a), and the stored solvent is supplied to the pretreatment step (S110-P) described above. Of course, in some cases, it may be directly supplied to the organic material separation step (S110).
- the gas solvent recovery step (S132) while treating the sewage sludge with a solvent extraction method using a liquid solvent, the gas solvent vaporized on the surface of the liquid solvent or in the air is recovered.
- the entropy of the gaseous solvent is increased by utilizing compressed air in the vaporization active tank, and the collected gaseous solvent is sent to a condenser to be liquefied (condensed) (S132a). Compressed air is supplied to an air cyclone device or the like installed in the vaporization active tank.
- the liquid solvent recovered and condensed in the gas solvent recovery step (S132) is also stored in the solvent storage tank, and the stored solvent is supplied to the pretreatment step (S110-P) described above. Of course, in some cases, it may be directly supplied to the organic material separation step (S110).
- the vaporization active tank and the peripheral device may constitute a closed circuit that is isolated from the external environment, and preferably, all previous processes are configured as a closed circuit.
- the sewage sludge discharged through a mechanical dehydration process in a conventional sewage treatment plant contains about 80% of moisture, and the present invention can further reduce 78%, so that it can be used as an alternative energy having high heat. .
- BOD, COD, SS, TOC and treated water with improved electrical conductivity are discharged.
- the outermost water and crystalline water are removed to produce sludge powder having a moisture content of less than 10%.
- Sludge powder containing only less than 10% moisture provides a calorific value of about 3,876 [Kcal/Kg], thus eliminating the need to landfill the sewage sludge-treated sludge powder and using it as renewable energy.
Abstract
Description
Claims (1)
- 다단 분리 반응조를 이용하여 하수 슬러지에서 유기물을 추출 및 처리하는 알케인 계열 용매를 이용한 하수 슬러지 처리 방법에 있어서,상기 하수 슬러지에 알케인(Alkane) 계열의 용매를 상기 다단 분리 반응조에 투입하여 상기 용매에 부착된 미생물 및 유기 슬러지를 상기 미생물의 외부에 존재하는 최외각수와 분리하는 유기물 분리단계(S110); 및비극성의 상기 용매를 상기 미생물의 내부로 확산시켜 팽압에 의한 미생물의 세포막 파괴를 유도하고, 세포막 파괴에 의해 미생물 내부에 잔존하던 결정수를 외부로 유출시켜 분리하는 유기물 농축단계(S120);를 포함하되,상기 유기물 분리단계(S110)에서 투입되는 용매는 상기 알케인 계열 용매 중 대기압 및 상온에서 액체 상태로 존재하는 용매이고, 상기 용매에 부착된 미생물 및 유기 슬러지는 비중이 1보다 작은 용매에 의해 물의 상측으로 부유하여 물과 분리되고,상기 유기물 분리단계(S110)에서 투입되는 상기 하수 슬러지는 하수 처리장에 순차로 설치되어 있는 화학적 처리조(10), 호기조(20), 침전조(30), 농축조(40) 및 탈수장치(50) 중 상기 호기조(20), 침전조(30) 또는 농축조(40)에서 처리를 마친 하수 슬러지이고,상기 용매 투입을 위한 전처리 단계(S110-P)를 더 포함하되,상기 전처리 단계(S110-P)는, 상기 하수 슬러지에 대한 혼합액 평균 부유물 농도인 MLSS(mixed liquor suspended solid) 농도를 검출하는 농도 검출단계; 및 상기 검출된 MLSS 농도에 따라 상기 투입되는 용매의 투입량을 결정하는 투입량 검출단계;를 포함하고, 상기 하수 슬러지의 MLSS 농도를 5,000[ppm] 미만으로 희석하는 농도 조절단계를 더 포함하며, 상기 유기물 분리단계(S110)에서 분리된 최외각수 또는 상기 유기물 농축단계(S120)에서 분리된 결정수 중 어느 하나 이상은 상기 하수 슬러지의 MLSS 농도를 시스템 적정값으로 유지시키도록 상기 하수 슬러지로 재투입되는 것을 특징으로 하는 알케인 계열 용매를 이용한 하수 슬러지 처리 방법.
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US17/417,978 US20220064042A1 (en) | 2018-12-24 | 2019-12-12 | Multistage separation reaction tank and method for treating sewage sludge by using alkane-based solvent using same |
CN201980092625.6A CN113784929A (zh) | 2018-12-24 | 2019-12-12 | 多段分离反应槽及利用其的利用烷烃系列溶剂的污水淤泥处理方法 |
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KR1020180168159A KR102018905B1 (ko) | 2018-12-24 | 2018-12-24 | 다단 분리 반응조 및 그를 이용한 알케인 계열 용매를 이용한 하수 슬러지 처리 방법 |
KR10-2018-0168159 | 2018-12-24 |
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WO2020138778A1 true WO2020138778A1 (ko) | 2020-07-02 |
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PCT/KR2019/017551 WO2020138778A1 (ko) | 2018-12-24 | 2019-12-12 | 다단 분리 반응조 및 그를 이용한 알케인 계열 용매를 이용한 하수 슬러지 처리 방법 |
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US (1) | US20220064042A1 (ko) |
KR (1) | KR102018905B1 (ko) |
CN (1) | CN113784929A (ko) |
WO (1) | WO2020138778A1 (ko) |
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KR102018905B1 (ko) * | 2018-12-24 | 2019-09-05 | (주)리사이텍 | 다단 분리 반응조 및 그를 이용한 알케인 계열 용매를 이용한 하수 슬러지 처리 방법 |
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KR102018905B1 (ko) * | 2018-12-24 | 2019-09-05 | (주)리사이텍 | 다단 분리 반응조 및 그를 이용한 알케인 계열 용매를 이용한 하수 슬러지 처리 방법 |
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KR20150056429A (ko) | 2013-11-15 | 2015-05-26 | 김용환 | 용매 추출을 이용한 슬러지와 폐수를 포함하는 하수의 처리방법 |
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2018
- 2018-12-24 KR KR1020180168159A patent/KR102018905B1/ko active IP Right Grant
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2019
- 2019-12-12 CN CN201980092625.6A patent/CN113784929A/zh active Pending
- 2019-12-12 US US17/417,978 patent/US20220064042A1/en not_active Abandoned
- 2019-12-12 WO PCT/KR2019/017551 patent/WO2020138778A1/ko active Application Filing
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JP2001070956A (ja) * | 1999-06-28 | 2001-03-21 | Yatsuka:Kk | ミネラルホールド材を用いた水処理方法及び装置 |
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KR101827305B1 (ko) * | 2017-05-23 | 2018-02-09 | 한국환경시스템 주식회사 | 유기성 슬러지의 탈수 및 분리를 위한 화학적 처리장치 및 이를 이용한 처리 방법 |
KR102018905B1 (ko) * | 2018-12-24 | 2019-09-05 | (주)리사이텍 | 다단 분리 반응조 및 그를 이용한 알케인 계열 용매를 이용한 하수 슬러지 처리 방법 |
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CN113784929A (zh) | 2021-12-10 |
KR102018905B1 (ko) | 2019-09-05 |
US20220064042A1 (en) | 2022-03-03 |
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