KR101934411B1 - High-temperature waste treatment method using sludge - Google Patents

Abstract

The present invention relates to a method for treating high-temperature wastes using sludge. High-temperature wastes containing incinerating agents, slag, and melting agents discharged from incineration plants, smelters, and thermal power plants and first dehydrated sludge with a moisture content of 30-85% are mixed at a weight ratio of 1:0.1 to 1:10 to obtain solid by-products. The high-temperature wastes are cooled so as not to form lumps and the moisture of the sludge is removed, thereby reducing the treatment cost of the high-temperature wastes and sludge and preventing environmental pollution. The finally obtained solid by-products can be recycled.

Description

[0001] The present invention relates to a high-temperature waste treatment method using sludge,

The present invention relates to a high-temperature waste treatment method using sludge, and more particularly, to a method for treating a high-temperature waste using sludge, and more particularly, to a method for treating a high-temperature waste by using sludge, Thereby cooling the hot waste and preventing the final by-product from solidifying to form a solid mass like a stone, thereby reducing the processing cost of the high-temperature waste and sludge, preventing environmental pollution, and recycling the finally obtained solid by-product The present invention relates to a high-temperature waste treatment method using sludge.

Generally, the high temperature waste such as incinerator, slag, and melted material after incineration and pyrolysis of incinerator, smelter, and thermal power plant is at least about 100 ° C. Specifically, incineration agent is at least about 400 ° C, slag is about 700 to 800 ° C, and the melting agent differs depending on the melting temperature. Generally, it is precipitated in cold water, cooled, and then treated.

On the other hand, the incinerator, slag, melter and the like are generated in an amount of less than about 20% by weight based on the weight before the incineration, melting and the like, and it is about 40 ~ 70% In particular, the incinerator has a problem in that the amount of waste to be incinerated is increased, and the operation target of the incinerator is for the reduction, compared with the incineration angle of about 40 to 70%.

In addition, when secondary wastes such as wastewater generated during the settling process are generated and landfilled without removing water, secondary environmental pollution such as increase of landfill amount and surrounding land pollution caused by leachate generated after landfilling occurs There was a problem.

Accordingly, although the method of removing water used for sedimentation is used, when the drying facility is used as a method of removing water, there is a problem that the cost and time for operating the drying facility are increased.

As a result, a method of landing without using a drying facility is used as well as a method of landing when moisture is removed. According to this method, the treatment time becomes longer and the water discharged from the field is absorbed into the surrounding soil, there was.

When the above-mentioned precipitation method is used, the high-temperature wastes are coagulated with high-temperature wastes in a process of rapidly cooling the wastes, and it is not easy to recycle the wastes as hard as a stone. In case of recycling, So that recycling is troublesome and difficult.

Therefore, it is urgently required to develop a new treatment method for reducing the amount of burnt by cooling the incinerator, slag, and melter without using a precipitation method.

On the other hand, the applicant of the present invention has found in Korean Patent Application No. 10-2017-0115206 that inevitably large quantities are generated in various industrial fields such as manufacturing of foods, agriculture, animal husbandry, etc. and in water and wastewater treatment of wastewater, A sludge having a high moisture content is mixed with fine powders such as fine carbon powder to form an atomized mixture to thereby more effectively remove moisture and odor in the sludge and to use the sludge as a sludge treating agent for other sludge treatment The Applicant of the present invention attained the present invention after carrying out a study to apply the technique of the above Patent Application 10-2017-0115206 to the treatment of high temperature waste.

Korean Patent No. 10-0613493

SUMMARY OF THE INVENTION An object of the present invention is to provide a method and a device for cooling high temperature waste such as incinerator, slag, and melted material discharged from an incineration plant, a smelter, a thermal power plant or the like so as not to form lumps by using sludge, The present invention is to provide a method of treating a high-temperature waste using sludge, which can reduce the disposal cost of wastes and sludge, prevent environmental pollution, and recycle finally obtained solid by-products.

In order to achieve the above object, the present invention is characterized in that dehydrated sludge having a moisture content of 30 to 85% (hereinafter referred to as "dehydrated sludge") discharged from a high temperature waste such as an incinerator, a slag, a melter, etc. discharged from an incinerator, a smelter, 1 dehydrated sludge) at a weight ratio of 1: 0.1 to 1: 10 to obtain a solid by-product. The heat contained in the high-temperature waste is transferred to the sludge without precipitation to form a lump of the high-temperature waste The present invention also provides a method for treating a high-temperature waste by using a sludge which is cooled without cooling the sludge and drying the sludge.

Wherein the first dewatered sludge can be directly mixed with the high temperature waste, wherein the high temperature waste temperature is less than 500 ° C.

The first dewatered sludge is mixed with the sludge treating agent and then mixed with the high temperature waste. In this case, the temperature of the high temperature waste is at least 100 ° C., and the sludge treating agent is selected from wood powder, fine carbon powder, dust collector fine powder, natural fine powder, (Hereinafter referred to as " second dehydrated sludge ") to adjust the water content to 10% to 80%.

On the other hand, some of the solid by-products may be reused in the high-temperature waste treatment process.

Also, steam and dust are generated in the process of mixing the high-temperature waste, the high-temperature waste treatment agent and the sludge. The waste heat (steam) and dust generated at this time are recovered and used again as incineration heat, so that the energy used for incineration can be saved.

In the process of manufacturing the sludge treatment agent, the atomized mixture is introduced into a vibration discriminator and classified according to the size of the particles. In the process of selecting the vibration, the first-order vibrational screening powder having the largest size is excluded, May be used.

In addition, the atomized mixture may be mixed with the first dehydrated sludge after the drying step.

On the other hand, the solid by-products obtained by cooling and drying according to the present invention are recycled to construction materials such as a revetment block, an artificial reef, an artificial aquatic plant for preventing green tide, and a garden stone.

According to the present invention, since the heat of the high-temperature waste is transferred to the sludge and cooled, there is no problem of loss of weight loss and secondary environmental pollution caused by the use of water.

In addition, it is possible to remove moisture through mixing with sludge generated in sewage or the like without mixing with a high-temperature waste without a separate dryer, and thus it is possible to treat the sludge simply and inexpensively.

In addition, the water content of the sludge mixed with the high-temperature waste is adjusted in advance so that the solid waste does not aggregate during the cooling of the high-temperature waste, so that the solid by-product can be processed without any additional crushing process, such as a revetment block, artificial reefs, And can be recycled as a building material.

1 is a process diagram showing a method for treating a high-temperature waste using sludge according to the present invention
2 is a view showing the structure of the sludge;
3 and 4 are views showing a process of manufacturing a sludge treating agent

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

It should be understood, however, that the techniques described herein are not intended to be limited to any particular embodiment, but rather include various modifications, equivalents, and / or alternatives of the embodiments of this document. In connection with the description of the drawings, like reference numerals may be used for similar components.

Also, the terms "first," "second," and the like used in the present document can be used to denote various components in any order and / or importance, and to distinguish one component from another But is not limited to those components. For example, 'first part' and 'second part' may represent different parts, regardless of order or importance. For example, without departing from the scope of the rights described in this document, the first component can be named as the second component, and similarly the second component can also be named as the first component.

In addition, the terms used in this document are used only to describe specific embodiments, and are not intended to limit the scope of other embodiments. The singular expressions may include plural expressions unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meaning as commonly understood by one of ordinary skill in the art. The general predefined terms used in this document may be interpreted in the same or similar sense as the contextual meanings of the related art and, unless expressly defined in this document, include ideally or excessively formal meanings . In some cases, even the terms defined in this document can not be construed as excluding the embodiments of this document.

The method for treating a high-temperature waste using sludge according to the present invention is characterized in that a first dehydrated sludge having a moisture content of 30 to 85%, which is discharged from a high-temperature waste such as an incinerator, a slag, a molten agent, etc. discharged from an incinerator, a smelter, And a solid-state byproduct in the form of granules, wherein the heat contained in the high-temperature waste is transferred to the sludge without precipitation, so that the high-temperature waste does not form one large lump And the sludge is dried.

In this case, the first dehydrated sludge can be directly mixed with the high-temperature waste. In this case, even if the first dehydrated sludge having high water content is in contact with the high-temperature waste, the high-temperature waste having a self- It is not quenched to form a solid mass like a stone.

1, the first dehydrated sludge 100 is mixed with a sludge treating agent 200 to produce a high-temperature waste treating agent 300 whose moisture content is adjusted to 10% to 80% In this case, the temperature of the high-temperature waste 400 is higher than 100 ° C., and the sludge treatment agent 200 is cooled to a first dehydrated sludge 100 in order to prevent the solidification of the hardened lumps due to rapid cooling with contact with moisture. To reduce the water content.

The waste heat (steam) and dust generated in this process can be recovered and reused in the incinerator to save energy costs for incineration.

The sludge treating agent 200 is prepared by mixing one or more fine powders 210 selected from wood powder, fine carbon powder, dust collector fine powder, natural fine powder and fine powder fine powder with a second dehydrating sludge 220 having a moisture content of 30 to 85% % ≪ / RTI > to 80%.

On the other hand, as shown in FIG. 2, the water contained in the sludge is free water (A), interstitial water (B), surface water (C) and intracellular andchemically bound water) (D).

The free water (A) is not attached to the sludge particles and can be separated by the gravity type precipitation method.

The pore water B may be trapped in the solid bodies in the sludge (Flocs) or may be removed with strong mechanical force with moisture present in the capillary of the dewatered cake.

The surface water (C) is moisture present in the adsorption and adhesion state on the surface of the solid particles in the sludge.

The combined water (D) is water present in the microbial cells in the sludge or chemically bonded to organic and inorganic solid particles.

Since the various water contained in the sludge is dehydrated primarily in the sewage treatment plant and the free water (A) and some pore water (B) are removed, the dehydrated sludge having a water content of 30 to 85% Is used as the first and second dewatered sludge.

On the other hand, in the conventional sludge treatment, the remaining pore water (B), surface water (C) and combined water (D) contained in the dehydrated sludge not removed in the dehydration process are removed through a drying process using a separate drier, It is lowered to 5 ~ 10% level.

In the present invention, however, the second dehydrated sludge 220, which is dewatered and maintained at a water content of about 85%, is mixed with the fine powder 210 to form the pore water B, the surface water C, ) Is quickly and effectively absorbed and removed to produce a sludge treating agent 200 in which the physical properties of the solid particles in the second dehydrated sludge are converted into particulate form.

The process for producing such an atomized mixture includes an atomization step (S10) and a vibration selection step (S40) as shown in Figs. 3 to 4.

In the atomization step S10, the fine powder 210 and the second dehydrated sludge 220 are mixed.

The second dewatering sludge 220 to be injected in the atomization step S10 is used for sludge, agricultural and livestock sludge, landfill sludge, post-wash residue (industrial, agriculture, Sludge generated after industrial activities such as fishery), dredged soil, and so on.

The sewage sludge is a sludge generated during the process of sewage treatment and has a characteristic that the concentration of the organic substance is significantly higher than that of the sludge.

Sewage sludge is a typical example of surplus sludge generated from raw sludge and final sedimentation generated from the initial sedimentation basin. It is treated by chemical treatment in advanced treatment such as total sedimentation treatment, and coagulated sedimentation sludge containing a flocculant component, sediment and sediment deposited in other sediments, Scum, and so on.

The above-mentioned manufacturing sludge is sludge generated in the process of manufacturing activities in various fields such as chemical and food. In particular, chemical sludge is sludge generated in a petrochemical plant.

The agricultural sludge is sludge generated in the process of agricultural by-products, and the livestock sludge is sludge generated from the wastewater discharged through the slaughtering, livestock wastewater treatment facility and the manure treatment facility.

The landfill sludge refers to sludge buried in a landfill.

The dredged soil is a sludge collected through dredging, which is a work of digging soil residue and soil or sand deposited on the bottom of the water. Dredged soil deposited at the bottom of a harbor, a marine road or a dam contains various organic matters inhabiting the river or sea water Organic sludge. Such dredged soil should be removed through regular dredging to maintain adequate water depth.

The fine powder 210 mixed with the second dewatered sludge 220 quickly and effectively absorbs and removes the pore water B, the surface water C and the combined water D in the second dewatered sludge 220, The physical properties of the solid particles are changed into particulate form, and the odorous components are quickly adsorbed and removed, and the viscosity is also removed.

At this time, the moisture content of the fine powder 210 should be kept below 15%. When the moisture content of the fine powder 210 exceeds 15%, the ability to absorb and remove the pore water B, the surface number C and the coupling water D in the second dehydrated sludge 220 is remarkably lowered, Can not.

Therefore, in order to carry out the smooth atomization step S10, the moisture content of the fine powder 210 should be maintained at less than 15%.

The fine powder 210 may be selected from wood powder, fine carbon powder, dust collector fine powder, natural fine powder, and fine powder fine powder. The fine powder 210 may be one kind selected from these, or two or more kinds thereof may be selected and mixed.

Wood flour is a fine dust collected during the process of processing wood in woodworks.

The dust collector fine particles are solid particulate dust collected by an industrial dust collector installed on the chimney of the industrial facility in order to block the emission of soot and particulates to the atmosphere. The particle size of the dust collector fine particles is 1 mm or less and smaller than 1 μm, and is collected according to various dust collecting methods using gravity, filtration, centrifugal force, and wavelength.

Naturally occurring fine particles are fine solid particles obtained by drying the sludge 100 under natural drying (sunlight) or similar physical drying conditions, and then separating the sludge 100 with a trays and separators of 1 mm or less, thereby maximizing the function of atomizing the sludge 100.

Premixed fine powder refers to the fine powder of fine particles coming out from the dust collector installed at the pens.

The fine carbon powder is a fine powder 210 produced by incomplete combustion or pyrolysis of fossil fuels such as petroleum, coal, and natural gas, tar, wood, etc., and is collected by an industrial dust collector, and the particle size is 1 to 500 nm.

In the atomization step S10, the mixing ratio of the second dewatered sludge 220 and the fine powder 210 is mixed at a weight ratio of 1: 0.1 to 10 according to the water content of the second dewatering sludge 220.

For example, the fine powder 210 may be mixed in a range of 1 to 1000 kg per 100 kg of the second dewatered sludge 220 having a water content of 80%, and the ratio may be adjusted within the above range depending on external conditions such as temperature and humidity of the working environment It can be controlled fluidly.

Between the atomization step S10 and the succeeding vibration selection step S40, a compression step S20 and a release step S30 may be further included.

In the pressing step S20, the contact surface area is increased by applying pressure to the mixture of the second dehydrated sludge and the fine powder using a pressing means such as a roller, so that moisture of various distribution forms in the second dehydrated sludge 220 is more easily (S30) is a step of uniformly lumping some of the agglomerated mass of the mixture in the previous squeezing step (S20).

The vibration selection step S40 is a step of injecting the atomized mixture into a vibration discriminator to separate and separate the atomized mixture according to the particle size.

The atomized mixture obtained in the atomization step (S10) has various sizes ranging from particles having a large particle size to small particles (one-stage non-passing minute-one vibration selection screen, one-step passing minute- The third passage, the fourth passage, and the fourth passage), and the pore size of the vibration separator can be variously applied by more than 0.2 mm by grasping the physical properties.

The first-order vibration fraction (the first-pass fraction) having the largest particle size is highly viscous and contains a large amount of water contained therein. Therefore, it is excluded from the sludge treatment agent and emulsified to be used as a high-efficiency fuel.

The size of the screen void of the vibration screening device used in the vibration screening step may be determined according to the test result of the physical properties of the sludge 100 to be injected in the atomizing step S10, . The degree of vibration selection can be adjusted as needed. Preferably, the sludge treating agent is selected by selecting one of the first stage separation, the second stage separation, and the third stage separation.

The high-temperature waste treatment agent 400 may be prepared by mixing the sludge treating agent that has undergone the vibration sorting step with the first dehydrated sludge 100. However, after the vibration sorting step and the drying step S50 are further performed, .

Among the vibration screening obtained by dividing the particle size, except for the primary vibration screening component having the largest size, the vibration screening component of the second or higher order is divided into two categories: (1-stage 2-stage 2-stage, , 3 stage 4 separation and 4 stage selection), and dried by each stage (1 stage 2 separation - 1 stage drying, 2 stage 3 separation - 2 stage drying, 3 stage 4 separation - 3 stage drying) do.

The higher the order, the smaller the size of the particles and the smaller the amount of water contained in the particles. Accordingly, in the drying step (S50), as the degree of vibration selection increases, the amount of supplied heat for drying is reduced so as to enhance the energy efficiency.

However, in order to simplify the process, it is possible to acquire only the secondary vibration selection minute and perform the drying step collectively.

Specifically, the secondary or tertiary vibration screening component is dried by a method selected from dry steam drying, infrared, ultraviolet, high frequency, microwave and natural (dry) drying, and the fourth vibration screening component is a breeze, It can be dried in natural light for 10 minutes to 5 hours.

The drying time and the drying method can be flexibly controlled within the above range according to the initial water content of the sludge and the weight of the vibration screen.

On the other hand, various types of organic fine solids are present in the sludge.

These organic fine solids absorb and remove moisture from various distribution forms in the sludge and adsorb and remove odor quickly.

However, organic fine solids originally contained in the sludge exist in a supersaturated state beyond a limit that can accommodate moisture.

Ultimately, the organic fine solids contained in the sludge are present in a state in which they can not substantially play a role in water absorption and odor removal.

However, these organic fine solids can also play a role when the water content is lowered.

In order to enable the organic fine solids contained in the microparticle mixture to act later, the physico-chemical properties of the organic fine solid material should be improved so as not to be carbonized due to the high temperature in the drying step (S50).

In the drying step (S50), when the vibration screening fraction is exposed to a high temperature above a certain temperature, pyrolysis proceeds and the carbonization reaction is promoted. As a result of the experiment, it is recommended to maintain the temperature below 300 ° C in the case of drying by the direct heating method and to keep it at 350 ° C or below in case of indirect heating so as not to be carbonized.

As a result, if the carbonization is overheated in the drying step, the organic fine solids present inside the vibrating screen will be damaged, and water absorption and deodorizing function will be degraded even if it is recycled for later sludge treatment.

The moisture evaporated from the vibration selective sorting step is subjected to a cooling and dehumidifying method, and is condensed and recovered through a drying step (S50), and is then subjected to water treatment, dry steam, plasma, or cantal heater.

The cooling and dehumidifying method is a method of cooling and separating moisture and odor-inducing substances by evaporating air by blowing air after cooling the vibrating screen to a predetermined temperature.

The dry steam method uses dry steam containing relatively little moisture compared to normal steam and contains warm air to remove gases containing moisture and harmful components.

The plasma method uses harmful gas by sterilizing malodor, bacteria, fine dust, bacteria and the like using plasma light similar to the solar light principle.

The cantilever type heater uses an electrically heated heat wire type heater to remove gas containing moisture and harmful components.

The collection step S60 is a step of collecting the sludge treating agent 200 by collecting the sludge or bulk dry matter and then mixing. The water content of the sludge treating agent 200 is preferably 15% or less.

As a result, the sludge having a high water content is produced from the sludge treatment agent 200 having a water content of 15% or less after the atomization step S10 to the recovery step S60.

Next, a process of mixing the sludge treating agent (200) and the first dewatered sludge (100) is performed to prepare a high-temperature waste treating agent (300) whose moisture content is variously adjusted to 10-80%.

The high temperature waste treatment agent 300 is mixed with the high temperature waste 400.

The high-temperature waste material 400 is mixed with the high-temperature waste material 400 at a weight ratio of 1: 0.1 to 1:10 by means of a screw mixer and a general mixer such as an incinerator, a slag, a melter, etc., which are incinerated and discharged in an incinerator, a smelter, Mix using a mixer or the like.

Accordingly, the heat of the incineration agent, slag, and molten metal is transferred to the high-temperature waste treatment agent to lower the temperature, and the moisture contained in the high-temperature waste treatment agent is evaporated by the heat of the incineration agent, slag, and molten agent.

The waste heat (steam) and dust generated in this process are recovered and reused in incineration facilities.

Therefore, it is possible to observe the effect of a single puddle which can dry the sludge simultaneously with the treatment of the incineration agent, the slag and the molten agent.

On the other hand, when the high-temperature waste such as incinerator, slag, and melted material is mixed with dehydrated sludge having a water content of about 80% or more at a temperature of 100 ° C or higher, it solidifies and solidifies as a stone. Can not do it. When the incinerator is cooled to produce a hard, lumpy mass like stone, much time and expense is added to the crushing operation for disposal.

Accordingly, the moisture content of the high-temperature waste treatment agent should be controlled according to the shape and properties of the dewatered sludge, the shape and properties of the high-temperature waste such as the incinerator, slag, and the melting agent, and the temperature.

For example, when the temperature of the high-temperature waste is 100 ° C to 200 ° C, the moisture content of the high-temperature waste treatment agent is adjusted to 80% or less, and when the temperature of the high-temperature waste is 200 ° C to 400 ° C, And the moisture content of the high temperature waste treatment agent is adjusted to 60% or less when the temperature of the high temperature waste is 400 ° C or higher and the melting temperature or lower.

That is, the temperature of the high-temperature waste and the moisture content of the high-temperature waste treatment agent are adjusted so as to be in inverse proportion so that when the high-temperature waste and the high-temperature waste treatment agent are mixed, they are not quenched but slowly cooled so as not to form agglomerates.

On the other hand, since the solid by-products formed by mixing the high-temperature waste and the high-temperature waste treatment agent obtained according to the present invention are in the form of small granules without being lumpy, they can be recycled as they are to building materials such as waterproofing blocks, artificial fishes, artificial herbaceous plants .

100: First dehydrated sludge 200: Sludge treating agent
210: fine powder 220: second dehydrated sludge
300: high-temperature waste treatment agent 400: high-temperature waste
500: solid byproduct

Claims (9)

delete delete A method for treating a high-temperature waste by mixing a high-temperature waste containing an incinerator, a slag, and a molten agent discharged from an incinerator, a smelter, or a thermal power plant with a high-temperature waste treatment agent,
The first dehydrated sludge having a moisture content of 30 to 85% is mixed with a sludge treating agent to produce a high-temperature waste treating agent, the high-temperature waste treating agent is mixed with the high-
The sludge treating agent may be prepared by mixing at least one fine powder selected from wood powder, fine carbon powder, dust collector fine powder, natural fine powder and fine powder fine powder having a moisture content of less than 15% with a second dehydrated sludge having a moisture content of 30 to 85% As an atomized mixture,
The sludge-
An atomization step (S10) for mixing the fine powder (210) and the second dehydrated sludge (220)
(S40) comprising two or more vibrational selection steps (S40) in which the atomized mixture is charged into a vibration discriminator to separately obtain an atomized mixture according to the particle size,
In the vibration selection step (S40), the primary vibration selection component having the largest particle size is removed,
Between the atomization step (S10) and the succeeding vibration selection step (S40), a squeezing step (S20) of increasing the contact surface area by applying pressure to the mixture of sludge and fine powder using a pressing means including a roller, (S30) for evenly pulverizing the partially agglomerated mixture agglomerates in the pulverizing step,
And a drying step (S50) of drying the organic fine solid material contained in the second dehydrated sludge after the vibration selection step (S40) to a controlled temperature so as not to carbonize the organic fine solid material. delete delete delete The method of claim 3, wherein the moisture content of the high-temperature waste treatment agent is controlled to be 80% or less when the temperature of the high-temperature waste is 100 ° C to 200 ° C, and the moisture content of the high- And the moisture content of the high-temperature waste treatment agent is adjusted to 60% or less when the temperature of the high-temperature waste is 400 ° C or more and the melting temperature or less. The method according to claim 3, wherein the solid by-product obtained by mixing the high-temperature waste and the atomized mixture is directly recycled to a construction material including a revetment block, an artificial reef, High temperature waste treatment method. 4. The method of claim 3, wherein the waste heat and dust generated in the mixing of the high-temperature waste and the high-temperature waste treatment agent are collected and reused in the incineration facility.

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