KR101167498B1 - treatment method for mud on the shores - Google Patents

Abstract

The present invention relates to a method for treating dredged soil stacked in a downstream, and to sorting waste, organic matter, and waste contained in dredged soil, and to a method for treating downstream sediment to achieve a comprehensive treatment for removal after recycling of hazardous substances. It is about. To this end, the present invention comprises the steps of dredging downstream sediment and classifying it into marine waste and dredged soil, pyrolyzing the marine waste to generate carbides, and separating and collecting nitrogen, oxygen and hydrogen gas from the cracked gas generated during the pyrolysis process. The marine waste treatment step and the dredged soil is characterized by undergoing a dredged soil treatment step of removing the heavy metal after dehydration, and then inorganic and organic matter, the organic material is dried and carbonized to produce carbide.

Description

Treatment method for mud on the shores

The present invention relates to a method for treating dredged soil stacked in a downstream, and to sorting waste, organic matter, and waste contained in dredged soil, and to a method for treating downstream sediment to achieve a comprehensive treatment for removal after recycling of hazardous substances. It is about.

Downstream, as the river's flow rate slows, the waste and fine soils transported in the runoff are stacked to form offshore sediments. Living sewage, agricultural wastewater, etc., which have flowed into the river, contain many organic substances, providing an environment in which various microorganisms actively proliferate. As a result, dissolved oxygen is very low and water quality deteriorates and anaerobic bacteria proliferate to form odors. It is acting as a cause to deteriorate the living environment and disturb the surrounding ecosystem.

In addition, since the marine sediment is deposited to the extent that the sea at the time of low tide, there is also a problem of restricting the route of the ship passing through the surrounding.

Therefore, it is necessary to dredge offshore sediments. Dredged sediments contain a large amount of domestic waste that has been pushed up during flooding, and most of them are organic sewage, livestock wastewater, etc. introduced from the upstream of the river. Furthermore, even heavy metals that are harmful by factory wastewater are deposited.

Therefore, an environmental purification process for separating such waste, organic matter, heavy metals, etc. is required for modern dredging operations.

The present invention is proposed in order to meet the above-mentioned requirements, while purifying various wastes and harmful substances contained in offshore sediment, while collecting excessively contained organic matter through a carbonization device, It is aimed at comprehensive treatment for the removal and recycling of hazardous substances.

Specifically, the purpose of the present invention is to recycle products during dredging operations by recycling carbides by marine wastes and recycling of carbides by organic substances contained in dredged soil.

Furthermore, it has the purpose of improving the energy efficiency and drying efficiency through the recovery and recycling of waste heat in each treatment step.

It also has the purpose of effectively treating the malodorous gas.

In order to solve the above problems, the present invention comprises the steps of dredging downstream sediment and classify it as marine waste and dredged soil, pyrolysis of the marine waste to generate carbides, nitrogen, oxygen and from the decomposition gas generated during the pyrolysis process The marine waste treatment step of separating and collecting hydrogen gas and the dredged soil are separated from heavy metals after dehydration, classify inorganic and organic materials, and the organic material is dredged sedimentary soil which is subjected to dredged soil treatment step of drying and carbonizing to produce carbide. It suggests how to deal with.

In addition, the dredged soil is presented a method of treating the downstream sediment, characterized in that the dewatered through the ultrasonic cavitation treatment process.

In addition, the heavy metal removal proposes a method for treating the downstream sediment, characterized in that the ultra-high magnetic field separation.

In addition, the ultra-high magnetic field separation is a ferromagnetic particle removal step for removing ferromagnetic heavy metal particles by passing the dredged soil through a magnetic disk filter of 1,000 gauss to 10,000 gauss and weak magnetic through a magnetic disk filter of 10,000 gauss to 60,000 gauss. The present invention provides a method for treating downflow sediment, characterized in that it is subjected to a weak magnetic particle removal step of removing heavy metal particles.

In addition, the drying and carbonization of the organic material is a drying step of drying the organic material supplied from the storage hopper by a rotary hot air dryer to generate a dry organic matter, and temporarily storing the dried organic matter and moving by a fixed amount through the transfer bucket And a carbonization step of generating a transported and dried organic matter into carbides through a carbonization machine, and the hot air discharged from the carbonization machine flows into the hot air dryer. .

In addition, in the drying step, the organic matter of the storage hopper is passed through the primary dryer lowering the moisture content by the hot air discharged from the carbonizer, and then introduced into the hot air dryer, and a part of the dry organic matter transferred in the transfer step is 1 A method of treating downstream sediment is characterized by being returned to a tea dryer.

In addition, the odor gas generated in the drying step is passed through the pre-filter device, the bag filter device after passing through the cyclone dust collector, and then burned through a heat storage incinerator, and then used as a heat exchange solvent in the heat exchanger to be supplied to the bag filter device. The present invention provides a method for treating downflow sediment, which generates hot air and is discharged through a scrubber for dust removal.

According to the present invention as described above, by integrating the marine sediment to achieve the concentration of the treatment process, by producing and recycling the carbide from the marine waste and organic matter has the effect of enabling a productive dredging operation.

Furthermore, the effective removal of microbiota contained in marine sediments such as anaerobic microorganisms has the effect of improving the surrounding living environment and ecosystem recovery.

In addition, there is an advantage that can be used eco-friendly in the recycling of dredged soil through the removal of heavy metals.

In addition, there is also an advantage that can increase the efficiency of heavy metal treatment through the removal of heavy metal particles for different stages of magnetic force.

In addition, it is possible to economically operate by saving the energy required for the treatment step by recycling the waste heat of the carbonizer, and also has the effect of increasing the drying efficiency through the preheating process.

In addition, the effective treatment of odor gas to remove the pollution of the surrounding air, it has the effect of maintaining the living environment of the residents around the dredging operation smoothly.

1 is a block diagram schematically showing a method for treating downflow sediment in accordance with the present invention.
2 is a view schematically showing a step of treating marine waste according to the present invention.
Figure 3 is a block diagram showing the heavy metal removal step of dredged soil according to the present invention.
4 is a view schematically showing a heavy metal removal step of dredged soil according to the present invention.
5 is a block diagram showing a treatment step of dredged soil according to the present invention.
6 is a schematic representation of a processing apparatus according to the block diagram of FIG. 5;

With reference to the accompanying drawings will be described a method of treatment of descent sediment in accordance with the present invention.

As shown in FIG. 1, the method for treating downstream sedimentary soil according to the present invention includes a classification step (SA) of dredging sedimentary sedimentary soil and separating the marine waste and dredged soil, and pyrolyzing the marine waste to generate carbides. Marine waste treatment step (SB) to separate and collect nitrogen, oxygen and hydrogen gas from the generated cracked gas and the dredged soil is to remove the heavy metal after dehydration, and then to classify the inorganic and organic matter, the organic material is dried and carbonized to produce carbide The dredged soil treatment step (SC) is to go through.

First, the classification step (SA) is a step of classifying the marine waste, such as the dredged soil, such as dog soil, sand contained in the dredged sedimentary sediment and the branches, tires contained in the dredged soil.

The sedimentation of sedimentary soils in down stream sedimentation is done using suction pumps, and the sedimentary sediment is collected by screening to collect and collect relatively bulky marine waste. This process can be accomplished through a generally known screen device. It is usually done at the lifting site of the marine sediment. For this purpose, the lifting device and the screen device of the sedimentary soil are mounted on a moving means such as a barge, and are configured to move along the dredging site of the marine sedimentary soil.

On the other hand, the marine waste treatment step (SB) is a step of carbonizing the marine waste collected from marine sediment to produce carbide. At this time, the marine wastes containing moisture are heated to a high temperature to exclude carbon materials based on carbon components, and collected by collecting and collecting nitrogen, oxygen, and hydrogen. After that, the remaining carbon material is cooled and recycled for use as a soil improving material.

Specifically, as shown in FIG. 2, the sorted marine waste is sequentially loaded through the processing chamber 120 stacked on the tray 110 and divided into multiple stages. The marine waste is temporarily stored in the storage chamber 121 and gradually heated to a high temperature while passing through the heating chamber 122, the pyrolysis chamber 123, and the carbonization chamber 124, and in the pyrolysis chamber 123. It decomposes into a mixed gas such as nitrogen, oxygen, hydrogen, etc. at a high temperature of 1400 ° C. or higher. Thereafter, the solid carbon component is cooled to room temperature through the cooling chamber 125 and then transported by the conveying conveyor 130 to be processed and used as recycled products using soil improvement materials or other carbides.

At this time, each processing chamber 120 is connected to the nitrogen supply device 140 to block the supply of oxygen, the nitrogen supply device 140, the nitrogen generator 141 for generating nitrogen, the nitrogen for storing the generated nitrogen Storage tank 142, nitrogen distribution line 143 for distributing nitrogen to each processing chamber 120 is included.

On the other hand, the decomposition gas treatment device 150 for separating and collecting the cracked gas is provided in each processing chamber 120, the collecting line 151 for collecting the cracked gas, and the cold storage tank is cooled while the collected cracked gas stays for a while ( 152, a component classification device 153 for separating cracked gas for each gas component, and a storage tank 154 for storing the separated gas are provided.

At this time, the nitrogen supply device and the cracked gas treatment device has a configuration according to a known technique.

Meanwhile, in the dredged soil treatment step (SC), after dehydration of water contained in the dredged soil from which marine wastes are removed, heavy metals are removed, and then separated into inorganic and organic materials such as sand and gravel, and the organic materials are dried and carbonized. Step to generate.

At this time, the dehydration of the dredged soil may be made through a process according to the ultrasonic cavitation. Ultrasonic cavitation may be a relatively low pressure large flanger pump and a Lichrorowicz cell-type rereactor using an underwater jet water jet, specifically, Korean Patent No. 10-796362 (Invention) It may be to use the ultrasonic cavitation complex system of the ultrasonic vacuum extraction concentrated method described in the name of: Ultrasonic Ultrasonic Extraction Method and Cavitation Complex System.

The treatment process according to the ultrasonic cavitation is to increase the instantaneous destructiveness of the bubble in the high pressure and high temperature environment through the high-frequency automatic oscillator of 10,000 to 100,000 hertz to induce the rise of ultrasonic energy to obtain a great dehydration effect. . In addition, it is possible to move the dredged soil using the SC-type booster pump without compressing the pressurized water or air. In addition, by effectively crushing the cell walls of sludge adsorption microorganisms, Escherichia coli, algae, etc. contained in the dredged soil, it is easy to separate the organic and inorganic substances, it is possible to remove harmful compounds such as chlorophenol (chloropehenol) compound .

After the treatment according to the ultrasonic cavitation to remove the heavy metal contained in the dredged soil, in this case, the heavy metal removal may be made through ultra-high magnetic field separation. The heavy metals include ferromagnetic heavy metal particles such as iron, manganese, cobalt, and nickel, and weak magnetic heavy metal particles such as calcium, magnesium, and gold. Ultra high magnetic field may be used to remove them. Specifically, as shown in FIGS. 3 to 4, dredged soil is passed through a magnetic disk filter 210 of 1,000 gauss to 10,000 gauss to remove ferromagnetic heavy metal particles. The ferromagnetic particle removal step (S1-1) and through the magnetic disk filter 220 of 10,000 gauss to 60,000 gauss may be subjected to the weak magnetic particle removal step (S1-2) to remove the weak magnetic heavy metal particles.

The dredged soil dehydrated in the ferromagnetic particle removal step (S1-1) passes through the magnetic disk filter 210 which is rotated by applying a magnetic force of 1,000 gauss to 10,000 gauss, and ferromagnetic heavy metal particles are formed on the magnetic disk filter 210. Attached. Thereafter, the surface on which the ferromagnetic heavy metal particles are attached is moved to the washing tank 230 by the rotation of the magnetic disk filter, and the ferromagnetic heavy metal particles attached to the magnetic disk filter are separated and recovered by the brush in the washing tank 230.

Meanwhile, in the weak magnetic particle removal step (S1-2), a magnetic force of 10,000 to 60,000 gauss is applied, and the weak magnetic heavy metal particles are attached to the surface of the weak magnetic heavy metal through the magnetic disk filter 220 which is slid and moved. The surface to which the particles are attached is moved to the washing tank 230 by the sliding movement of the magnetic disk filter, and likewise separates and recovers the weak magnetic heavy metal particles attached to the magnetic disk filter 220 with a brush or the like.

To this end, the magnetic disk filter 210 that rotates and the magnetic disk filter 220 that slides in a straight line are continuously provided on the trajectory (block arrow direction in FIG. 4) in which the dredged soil moves, and The washing tank 230 is provided at one side, and the washing tank 230 is provided at both left and right sides of the magnetic disk filter 220 that slides. Of course, in addition to such a configuration, a heavy metal magnetic separation device using a superconducting magnet and a high super magnetic field may be used.

Then, as shown in Figure 5 to 6, the dredged soil is separated into inorganic and organic material, the inorganic material is recycled to landfill cover material, the organic material is recycled to carbide through the drying and carbonization process. At this time, the inorganic and organic matter is separated through a wet cyclone apparatus, or other known classification.

In addition, the drying and carbonization of the organic material is a drying step (S2-1) for drying the organic material supplied from the storage hopper 310 by a rotary hot air dryer 330 to generate a dry organic matter, and temporarily storing the dried organic material And a transfer step (S2-2) for quantitatively moving through the transfer bucket 350, and a carbonization step (S2-3) for generating the dried organic matter as carbide through the carbonizer 370, wherein The hot air discharged from the carbonizer 370 may be configured to flow into the hot air dryer 330.

Specifically, in the drying step (S2-1), the storage hopper 310 is a place where the organic material from which heavy metals are removed is temporarily stored, and is introduced into the hot air dryer 330 by the transfer screw 320. The hot air dryer 330 is a device that generates dry organic matter by evaporating moisture contained in the organic material by mixing the hot hot air supplied from the outside and the organic material introduced from the storage hopper, the inside of the rotary type to mix the organic material and hot air A drum and a stirrer are provided. Therefore, the organic material added to the hot air dryer is scattered inside the drum by the operation of the spinning pad and the drum, heated by blowing hot air, and dried by removing the moisture contained therein. Dry organic matter is discharged to one end of the hot air dryer.

In the transfer step (S2-2), the transfer bucket 350 is in accordance with the configuration known as a device for vertically moving the drying organic falling from the transfer conveyor 340 to the top. The transfer bucket 350 may be provided with a plurality thereof to move the dried organic material to a high position, and a storage tank 360 may be further provided between the transfer bucket 350 to temporarily store the dried organic material. The dry matter moved through the transfer bucket 350 is introduced into the carbonizer 370 in a quantitative manner.

In the carbonization step (S2-3), the carbonizer 370 is a device that carbonizes the injected dry organic material at high temperature. The carbonizer 370 includes a burner 371 which uses natural gas or the like as a fuel source. It is configured to supply air to the burner 371 through the air compressor 380. The organic matter in the carbonizer 370 is carbonized at a high temperature to be converted into carbide and then discharged, and then passed to the carbide reprocessing process through a carbide transfer bucket. In this carbide reprocessing process, the carbide is compression molded to produce a constant shape.

On the other hand, the combustion gas generated in the carbonizer 370 is supplied to the hot air dryer 330 as a heat source, it is possible to recycle the waste heat. To this end, the hot air supply line 372 of the carbonizer 370 may be connected to the hot air dryer 330.

More preferably, in the drying step S2-1, the organic material of the storage hopper 310 passes through the primary dryer 390 which is preheated by the hot air discharged from the carbonizer 370, and then the hot air dryer ( 330, a portion of the dry organic matter transferred in the transfer step S2-2 may be returned to the primary dryer 390.

The primary dryer 390 is configured to receive the combustion gas of the carbonizer 370 and to preheat the organic matter stored in the storage hopper and to put it in the aforementioned hot air dryer, and the hot air passing through the primary dryer 390 is hot air. Is introduced into the dryer 330 is configured to use as a heat source.

As a result, by increasing the temperature of the organic material introduced into the hot air dryer, the inside of the hot air dryer can be maintained at a higher temperature, and the drying efficiency of the organic material can be further increased.

At this time, the combustion gas flowing into the hot air dryer may be passed through the primary dryer as described above, or may be combustion gas that is not shown but split from the year of the carbonizer and not passed through the primary dryer.

Further, the malodorous gas generated in the drying step (S2-1) passes through the pre-filter device 420, the bag filter device 430 after passing through the cyclone dust collector 410, and then burns through the heat storage type incinerator 440. After treatment it can be released.

In the hot air dryer 330, a mixture of a large amount of water vapor generated during the drying process and the cooled combustion gas usually contains an odor component. The odor gas passes through the cyclone dust collector 410 to collect dust, and passes through the prefilter device 420 to filter out fine dust of 10 micrometers or more, and then passes through the bag filter device 430 in order to be 1 micrometer. The odor component or volatile organic compound (VOC) component remaining after filtering to the above ultra fine dust is decomposed and then discharged from the heat storage incinerator 440 (RTO), thereby preventing the emission of the odor component.

In addition, the hot exhaust gas decomposed in the incinerator 440 may be used as a heat exchange solvent in a heat exchanger to generate hot air supplied to the bag filter device, and may be discharged through a scrubber for dust removal. The heat exchanger is used to heat the outside air inside the heat exchanger in which outside air is introduced and the high temperature of the exhaust gas is used as a heat source. The heated outside air flows into the bag filter device 430 as shown, or is supplied to the prefilter device and the bag filter device.

The exhaust gas passing through the heat exchanger 450 is discharged to the atmosphere through the flue after removing the dust and the like in the scrubber 460.

110: tray
120: treatment chamber
121: storage chamber 122: heating chamber 123: pyrolysis chamber
124: carbonization chamber 125: cooling chamber
130: conveying conveyor
140: nitrogen supply device
141: nitrogen generator 142: nitrogen storage tank 143: nitrogen distribution line
150: cracked gas treatment device
151: collecting line 152: cooling storage tank 153: component sorting device
154: storage tank
210, 220: magnetic disk filter 230: washing tank
310: storage hopper 320: transfer screw 330: hot air dryer
331: hot air supply line 340: transfer conveyor 350: transfer bucket
360: Storage tank 370: Carbonizer 371: Burner 372: Hot air supply line
380: air compressor 390: primary dryer
410: cyclone dust collector 420: pre-filter device 430: bag filter device
440: heat storage incinerator 450: heat exchanger 460: scrubber

Claims (7)

Dredging downstream sediment and classifying it as marine waste and dredged soil; A marine waste treatment step of pyrolyzing the marine waste to generate carbides and separating and collecting nitrogen, oxygen and hydrogen gas from the decomposition gas generated during the pyrolysis process; And the dredged soil is dehydrated after removal of heavy metals and the inorganic and organic matters are classified, the organic material is dried and carbonized dredged soil treatment step to produce a carbide;
Drying and carbonization of the organic material is a drying step of drying the organic material supplied from the storage hopper by a rotary hot air dryer to produce a dry organic matter; A transfer step of temporarily storing the dried organic matter and moving the fixed organic matter by a fixed amount through a transfer bucket; And a carbonization step of generating the transferred organic matter into a carbide through a carbonization machine, wherein the hot air discharged from the carbonization machine is introduced into the hot air dryer.
In the drying step, the organic material of the storage hopper is further passed through the primary dryer lowering the moisture content by the hot air discharged from the carbonizer, and then put into the hot air dryer,
A part of the dry organic matter conveyed in the said conveying step is returned to the said primary dryer, The method of processing the sedimentary downstream soils characterized by the above-mentioned. In claim 1,
The dredged soil is treated with descent sedimentary soil, characterized in that the dewatering through the ultrasonic cavitation process. In claim 2,
The heavy metal removal method of the sedimentary sediment soil, characterized in that made through ultra-high magnetic field separation. 4. The method of claim 3,
The ultra-high magnetic field separation
A ferromagnetic particle removal step of removing ferromagnetic heavy metal particles by passing the dredged soil through a magnetic disk filter of 1,000 gauss to 10,000 gauss; And
A method of treating down-flow sediment, characterized in that it comprises a; weak magnetic particle removal step of removing the weak magnetic heavy metal particles through a magnetic disk filter of 10,000 gauss to 60,000 gauss. delete delete In claim 1,
The malodorous gas generated in the drying step passes through a pre-filter device and a bag filter device after passing through a cyclone dust collector, and is then burned through a heat storage incinerator, and then used as a heat exchange solvent in a heat exchanger to be supplied to the bag filter device. The method for treating downfall sediment, characterized in that it is generated and discharged through a scrubber for dust removal.

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