KR100776651B1 - An purifying apparatus using centrifugation for dredged sediment - Google Patents

Abstract

An apparatus for purifying dredged sediment is provided to purify promptly matters containing external particles and organic substances, which are included in the sediment, in real-time. A suction pump(31) is installed on a dredger to suck sediment deposited on the bottom of the sea. A continuous type centrifuge(38) purifies floating matters included in the sucked sediment using centrifugation. An electrical reactor(40) decomposes and coagulates the purified floating matters through electrolysis. A sediment storing tank(36) stores the sediment sucked by the suction pump before inputting the sucked sediment into the continuous type centrifuge.

Description

An Purifying Apparatus Using Centrifugation for Dredged Sediment}

1 is a structure of a continuous centrifuge used in the centrifugal centrifugal apparatus for medicine centrifugal separation method according to the present invention

Figure 2 is a schematic block diagram of the apparatus for semi-setting sediment centrifugal separation method according to the present invention

<Brief description of symbols for the main parts of the drawings>

9; Centrifuge sludge outlet 10; Centrifuge Rotary Cylinder

15; Centrifuge Sludge Removal Screws

19; Centrifuge raw water discharge port 20; Centrifuge Raw Water Input Pipe

21; Centrifuge treated water outlet 22; Centrifuge Raw Water Inlet

31; Raw water suction pump 32; Bottom Centrifuge

33; Conveyor belts 34; Raw water auxiliary tank

35; Cyclone centrifugal filtration device 36; Sediment storage tank

37; Flocculant tank 38; Continuous Centrifuge

39; Centrifugal treatment tank 40; Electric reactor

41; Pressurized float 42; Pressurized floatation treatment tank

43; One-stage filtration device 44; Two stage filter

45; Filtrate treatment tank 46; Steel slag filtration device

47; Effluent On-Line Measuring Device

The present invention inhales various kinds of sediments existing on the lower surface such as semi-closed bay, lower area, harbor area, warm drainage area, fish farming area, and inland water area using hydraulic pump, air pump and electric motor pump. The inhaled sediment is purified by centrifugal force with a continuous centrifuge, and has an electric reaction tank which electrolyzes the treated water purified through the continuous centrifuge and oxidizes the suspended matter and aggregates it. Decomposition and treatment of suspended solids by indirect oxidation by active oxygen and oxides such as active hydroxyl groups, and a pressurized floatation tank that floats air bubbles at high pressure to separate and remove suspended solids and trace organic matter in the treated water. A quasi-setting device using centrifugal centrifugal separation consisting of steelmaking slag filter capable of removing nitrogen and hydrogen sulfide will be.

In the prior art, enormous amounts of dredged soils are generated along with secondary pollution such as floating soils in dredging process in which dredging projects are being carried out to maintain route and clean up polluted waters. Or it is disposed of in landfill.

Conventional dredging methods include a hopper type that sucks sediments by sending a pipeline with a suction plate of a certain size using a dredger to the seabed, and a gravure type method for pumping sediments. There is a problem in that there is a limitation in processing capacity by a general dredging method such as sending a sediment sucked by a pump dredger to a large landfill or transporting it to an offshore dumping site, and there is a problem in that it cannot be processed quickly.

In addition, in the prior art, in the patent application No. 10-0529536, filed by the applicant of the present invention has been proposed a technique for direct discharge treatment of the final treated water to the sea or reservoir by sediment dredging method, such as caged fish farm, Patent No. 10-0529536, filed and filed by the Applicant of the patent, is for dredging areas around the fish farms where fish are farmed, and many of them do not use chemicals to maintain the high quality of the final treated water. There is a problem in that the treatment process is further added to purify because it takes a lot of dredging equipment, can not achieve rapid dredging work.

The technical problem to be achieved by the present invention is to conceive and solve the problems of the prior art as described above, exist in the bottom surface of the semi-closed bay, river area, port area, on-water drainage, farmed fish farm, inland water surface, etc. The various types of sediment are sucked by hydraulic pump, air pump and electric motor pump, and relatively large foreign substances such as sand, gravel and other wastes are separated by filtration by drum filter or bottom centrifuge and the filtrate is attached with stirrer. Injecting the sediment storage tank, administering the coagulant to the injected sediment, stirring the reactant to react with the fine suspended matter present in the sediment, and then flocculating the aggregated sediment with the heavy particles using the centrifugal force of the centrifuge to make the particles larger. Are collected on the inner wall of the centrifuge barrel, and the purified separation liquid is collected inside the rotor. It is configured to be pushed out by a screw installed inside to rotate in a direction opposite to the rotational direction of the centrifuge and discharged to the sludge discharge port of the centrifuge. The separation liquid purified by centrifugation removes suspended solids by oxidation by electrolysis. It is oxidized, and it is injured in the electric reactor and flocculated suspended solids which are floated by hydrogen gas and oxygen gas generated in the process of aggregating a small amount of suspended solids by electrolysis of aluminum due to electrolysis of aluminum as electrode material. It is equipped with a pressure levitation tank for injecting high-pressure air to give more effect, and is installed to collect and remove the scraper or hopper that rotates the flocculated fine suspended matter, and to the filter of the various stages in the rear stage of the electric reactor as necessary Can be operated according to the quality of treated water. Designing by implementing a manufacturing dredging purifier from a relatively large foreign matter contained in the deposit of organic, hydrogen sulfide, etc., and small amount of organic nitrogen in real time, quick and clean it is an object of purification treatment.

It is still another object of the present invention that the concentration of fine suspended matter in the separation liquid discharged from the continuous automatic centrifuge is about 100 ppm, when the concentration of fine suspended matter such as the port area, which is dredging, is maintained at about 100 ppm. Since the conditions are similar to the conditions, the treated water can be discharged while passing through the continuous centrifuge, and there are caged fish farms in the surrounding waters, which may cause damage to fisheries and fish farms, or fine suspended matter in the surrounding waters. In areas where the concentration is required to be less than 100ppm, the concentration of fine suspended solids is purified to about 20ppm through the purification process using an electric reactor and pressurization tank, which are the next steps. It is relatively clean and can be discharged directly to the area around dredging area. Depending on the quality of the water and the degree of cleanliness of the treated water required in the dredging area, it is possible to selectively add several stages of filtration device to purify and to adsorb soluble components such as sulfur and organic phosphorus remaining in the water. For this purpose, selective operation can be automatically or manually controlled in consideration of the degree of purification, such as passing through a steelmaking slag filtration device, to economically and quickly separate and purify sediment.

Another object of the present invention to achieve a sediment semi-setting device that can be quickly restored in an environmentally friendly manner using primers, such as environmentally friendly polymer coagulants without harming the body and water pollution.

The present invention inhales various kinds of sediments existing on the lower surface such as semi-closed bay, lower area, harbor area, warm drainage area, fish farming area, and inland water area using hydraulic pump, air pump and electric motor pump. The inhaled sediment is separated and purified by centrifugal force of the centrifugal centrifuge, and has an electric reaction tank which electrolyzes the treated water purified by centrifugal force to oxidize suspended matter and oxidizes it. The present invention relates to a quasi-setting device formed by installing a pressure flotation tank and a multi-stage filter that decompose and process a floating material by indirect oxidation, and inject air bubbles at high pressure to float and remove the floating material.

Looking at the surrounding environment related to the present invention, the overall environmental pollution in other environmental management waters such as semi-closed bay, estuary area, port area, warm drainage area, fish farming area, inland water rights area, etc. To monitor, evaluate, and forecast marine pollution in real time by combining the latest engineering technology to create an ecologically healthy, economically rich, and environmentally comfortable sea so as to continuously enjoy the various values of the sea. At the same time, there is a need for an environmental technology capable of efficiently removing contaminants and restoring disturbed environments in an environmentally friendly manner.

In addition, eco-friendliness and high efficiency are considered in view of tightening regulations on ocean dumping following the entry into force of the 1996 London Dumping Convention (LDC) Protocol, deepening secondary pollution during dredging, increased environmental complaints for dredged sediments, and low pollution of fish farms. Dredging technology (hydraulic) is urgently needed, and technology to reprocess and resourceize dredged soil is urgently needed.

Hereinafter, with reference to the accompanying drawings illustrating the configuration and operation of the embodiment of the present invention, the configuration and operation of the present invention shown and described in the drawings will be described as at least one or more embodiments, whereby the present invention described above The technical idea and its core composition and operation are not limited.

With reference to the drawings shown to facilitate understanding of the present invention. Figure 1 shows the structure of the continuous centrifuge used in the centrifugal sediment semi-setting device according to the present invention, Figure 2 is a schematic configuration of the semi-sediment set-up device using the centrifugal centrifuge according to the present invention It is shown.

The present invention is a hydraulic pump, air pump or electric to suck up the various types of sediment existing in the lower surface, such as submerged fish farming area, inland water surface, such as semi-closed bay, river area, harbor area, warm drainage area, kelp, etc. Motor pumps, etc., are located on the dredger, and relatively large foreign substances such as inhaled sand, gravel and various kinds of sediments are separated by filtration, and the inhaled sediments are stored in the sediment storage tank.

The coagulant is composed of harmless and environmentally friendly components and is stirred with a stirrer installed in the sediment storage tank to quickly flocculate the suspended matter.The centrifugal force of the continuous centrifuge separates and purifies the sediment quickly, allowing the surrounding fishing and farming If it is determined that there is no problem in consideration of the conditions around the dredging sea area, the purified water is discharged in a condition similar to the water quality conditions of the dredging sea area. And discharge the purified water by selectively passing through any one of an electric reactor, pressurized flotation tank, cartridge or disk filter of various stages, and steelmaking slag filter in consideration of the conditions around the dredging water such as fish farms. Impurities in the suspended solids after selective passage Centrifuge semi-established technology for centrifugation of microorganisms, bacteria, organophosphorus, organic nitrogen and trace amounts of hydrogen sulfide that affects side effects, and it is configured to centrifuge and purify sediments quickly and cleanly in real time. .

It is provided in the intermediate treatment process and the final treatment step of the sediment recovery and purification apparatus according to the present invention is provided with various on-line measuring devices to continuously measure the state of the treated water and the final treated water for each process. The ON-Line measuring device installed to check the status of each process and the final treatment water is a device that can measure the concentration of necessary substances by continuously and automatically inspecting the quality of each process and the final treatment water. It is configured to record in real time the concentration change of fine suspended solids by each treatment process, the concentration of fine organic matter in final treated water, PH, temperature and discharged treated water.On-line measuring device It is equipped with a plurality of sensors and configured to measure the quality of water such as chemical oxygen demand (COD), phosphorus, nitrogen, sulfur compounds, and fine organic matter concentrations of the final treated water in real time and to operate according to the requirements of the treated water. have.

According to the present invention, a process of sucking the sediment with a suction pump located on the ship, and a plurality of processes to purify the sucked sediment are automatically performed by a central control unit having a programmable logic controller (PLC) or a micro processor control unit (MCU). It can be designed to be designed and manufactured to be controlled by the control or to be manually controlled by the demands of the users.

The central control unit has a self-diagnosis function that checks whether the machines operate normally during each process by incorporating a control program interlocked with a sensing sensor installed during each process, and displays an abnormality in any one process. Means for displaying on the panel are provided. If an abnormality occurs in the process during the purification process of the sediment, a feedback system (Feed Back System) configured to stop the discharge of the purified treatment water, return the treated water to the sediment storage tank and reprocess it. The power supply unit according to the present invention is configured to produce electric energy by a large generator to supply power to all the devices requiring the above power supply. It looks at a specific embodiment according to the present invention.

EXAMPLES

A specific embodiment according to the present invention will be described with reference to the drawings. The present invention is a hydraulic pump, air pump or electric motor for sucking various kinds of sediment existing on the lower surface such as semi-closed bay, lower area, harbor area, warm drainage area, fish farming area, inland water surface area, etc. A suction pump consisting of a pump or the like is installed on the dredger. The sediment sucked by the suction pump is injected into the sediment storage tank 36 installed on the dredger, and the injected sediment storage tank 36 quantitatively injects a coagulant of harmless components without environmental pollution from the coagulant tank 37 to be deposited. Stirring agitator 48 installed in the reservoir is configured to react quickly to form agglomeration.

The sediment aggregated by reacting with each other by the coagulant is injected into the continuous centrifuge (38), and the fine organic matter agglomerated with the heavy particles by the centrifugal force of the rotating continuous centrifuge (38) becomes a continuous centrifuge. (38) Collected on the inner wall of the barrel, the treated water is collected into the inner side of the rotating cylinder, and designed to rotate in the opposite direction to the rotation direction of the continuous centrifuge (38) to the inner wall of the cylinder by a screw installed inside the cylinder. The collected heavy particles and aggregated particles are pushed out and discharged to the sludge discharge port of the continuous centrifuge 38. The purified treated water while passing through the continuous centrifuge 38 undergoes an electrolysis reaction in the electrocoagulation 40 tank to agglomerate fine suspended matter, and generates fine air bubbles at high pressure in the pressure flotation tank 41. It is configured to float and float the float to the top, and to remove it quickly with a scraper or hopper for processing.

More specifically, the sediment sucked by the hydraulic pump, air pump or electric motor pump is usually sucked to about 10 to 15% of the fine suspended solids, and removes large foreign substances such as oyster shell and gravel contained in the suction deposit. A primary screen filter 32, such as a drum screen or a bottom centrifuge, is installed to be able to do so.

Damage to the screw of the continuous centrifuge (38) by passing through the cyclone filter (35), which is a secondary process in order to separate and remove a small amount of sand in the sediment passed through the primary screen filter (32) It is configured to separate and remove the sand component. The sand-free sediment is configured to be injected into the sediment storage tank 36 through an on-line flowmeter.

Inside the sediment storage tank 36, a stirrer 48 capable of adjusting the rotational speed by a rotating motor is attached, and a line capable of quantitatively introducing seawater-only coagulant (primer, which is a polymer coagulant) from the coagulant tank 37. It is configured to automatically inject seawater flocculant at a certain concentration according to the flow rate measured on the on-line flowmeter.

The injected flocculant is mixed and reacted with the deposit by the stirrer 48 attached to the deposit storage tank 36, and the reacted flocculant is configured to be injected into the continuous centrifuge 38 by a metering pump.

The sediment introduced into the feed line 12 of the continuous centrifuge 38 flows into the inlet (20 in FIG. 1) located at the center of the rotating cylinder (15 of FIG. 1) rotating at a high speed, and the center of the rotating cylinder. It is distributed through the discharge port (19 in Fig. 1) located in. The deposits that enter the rotating cylinder body are collected by the centrifugal force of the rotating cylinder at high speed, and the heavy debris is collected into the inner wall of the rotating cylinder, and the separated supernatant is collected at the center of the rotating cylinder.
In the quasi-setting device according to the present invention, the coagulation agent injection process and the number of times may be variously designed and manufactured. The coagulation agent may be injected into the sediment storage tank 36 by being installed at the front end of the continuous centrifuge 38 as described above. Floating material is agglomerated to purify, or injected into the treated water purified by the continuous centrifuge (38) is configured to aggregate and purify the suspended matter, or floating matter in the required position of the previous and subsequent steps of the continuous centrifuge (38) It can be configured to install a reservoir and inject coagulant to coagulate and purify the suspended matter. That is, the step of injecting the flocculant according to the present invention may be configured to coagulate and process the suspended matter by installing one or more in the required process.

As the sediment continues to be discharged, if the incoming capacity exceeds the internal capacity of the rotating cylinder, the separated separation liquid is discharged to the separation liquid discharge port (21 in FIG. 1) and is configured to be automatically injected into the treated water auxiliary tank 39. .

On the other hand, the sludge attached to the inner wall of the rotating cylinder is transferred in the opposite direction of the separation liquid discharge port by the screw 10 rotating at a different speed from the rotating cylinder, and dewatered while passing through the inclined surface (A Zone = Drying Zone) of the rotating cylinder. It is discharged to the sludge discharge port (9 in Fig. 1). The dewatered sludge discharged from the sludge discharge port (9 in FIG. 1) is transferred to the sludge reservoir by a sludge conveying pump installed at the lower end of the continuous centrifugal separator 38.

The treated water collected in the treated water auxiliary tank 39 is purified to about 100 ppm of fine suspended solids, and when the concentration of fine suspended solids in the surrounding area of dredged water is 100 ppm or more, the final treated water is purified in a continuous centrifuge. However, if the water quality of dredged area is less than 100ppm concentration of fine suspended solids or damage caused by polluted water quality such as caged fish farms around dredged area, electrocoagulation tank (40) and It is configured to pass through the pressure injured tank (41).

The electric reaction tank 40 and the pressure flotation tank 41 react the purified water from the continuous centrifugal separator 38 with direct current in the electric reaction tank 40 to exchange the electrons at the positive (+) surface of the electrode. Micro-floating materials are oxidized by direct oxidation and indirect oxidation by oxides such as active oxygen and active hydroxyl groups generated in the electrode, and the effect of decomposition of organic phosphorus, organic nitrogen, COD, etc. present in the treated water is high. The fine suspended solids (SS), such as organic matter, are generated in the process of oxygen gas at the positive electrode (+) and the hydrogen gas at the negative electrode (-) due to the electrolysis of the electric reaction tank. It is designed to collect floats and float them to the surface.

The purification method of the treated water by the electric reaction tank 40 and the pressurization tank 41 has the effect of decomposing and flocculating the fine suspended matter and organophosphorus, organic nitrogen, BOD, etc., but also the electrolytic sterilization effect, When the potential difference between redox and redox is 700㎷-2,700㎷, it has the effect of disinfecting the cell membranes of microorganisms including E. coli to sterilize harmful microorganisms present in the treated water.

The fine suspended solids (SS) having a slight floating force by ultra-fine hydrogen and oxygen gas generated by the electrolysis in the electric reaction tank 40 are introduced into the pressure flotation tank 41, and the pressure flotation tank 41. In the air to generate microbubbles with compressed air at high pressure, the generated bubbles are sprayed into the treated water to collect the suspended matter with the microbubble to rise to the top, and the fine suspended matter (floating to the upper end of the pressure relief tank (41) ( SS) is collected to one side by a scraper that rotates in the upper portion of the pressure floatation tank 41 and is transferred to the sludge reservoir through the transfer pump.

The treated water passing through the electric reaction tank 40 and the pressure flotation tank 41 has a concentration of suspended solids (SS) of about 20ppm, the suspended solids concentration is 20ppm concentration of the fine suspended solids treatment standards of the sewage terminal treatment plant. Since it corresponds to the water quality, it is purified to the extent that it can be directly discharged to the dredging area for treatment.

If the dredging target area is the Chungcheong area or the surrounding environment requires more purified water, the treated water passing through the electric reaction tank 40 and the pressure flotation tank 41 is collected in the auxiliary tank and is subjected to a five-step filtration process. It can be configured to further purify by adding. The filtration process that is further added for the cleaner purification can be changed to a disc having a corresponding pore size or a disc which can be filtered in order to obtain the required cleanliness by using cartridges having different pore sizes of the filter used in the filter. Filters or cartridge filters can be installed and clarified to control the cleanliness of the final treated water.

Hydrogen sulfide, nitrogen nitrate, and nitrite nitrogen, which are generated by anaerobic fermentation, exist in the sediment settled as needed, so that traces of soluble harmful substances need to be removed because traces of harmful substances are dissolved in water, not suspended matter. If there is, through the steelmaking slag filter 46 having a good adsorption effect such as organic nitrogen, organic phosphorus and sulfur, it can be configured to remove the harmful organic substances dissolved in the treated water.

The discharge of the final treated water is discharged through the treatment port with ON-Line measuring device, and the treated water is recorded in real time to record the concentration, PH, temperature, and discharge of suspended solids by XY recorder. The purified water can be stored as evidence of normal discharge.

All processes required for the semi-setting as described above are controlled by a central control unit having a programmable logic controller (PLC) or a micro processor control unit (MCU) so as to be located in the dredger to be automatically or manually controlled by an operator. In addition, the central control unit is provided with a display panel for displaying the normal status and the current operating state of each device, or to input and display the control capacity and operation information.

As can be seen from Figure 2 in the purification process of the sediment sucked into the dredger through the suction pump, the step of purifying using a continuous centrifuge is essentially passed through, in order to purify the electric reactor and / / Alternatively, in order to achieve rapid and efficient purification, the flocculant is injected from the flocculant tank into the deposit reservoir and stirred by a stirrer to purify through a continuous centrifuge. Since it is configured to further purify the filter of the manner, the protection scope can be protected by describing the configuration of the invention further added to the purification process.

In addition, a primary screen filter such as a drum screen or a bottom centrifuge is additionally installed in order to remove large foreign substances such as oyster shells and gravel contained in the sediment sucked in the step before flowing into the continuous centrifuge. In order to separate and remove a small amount of sand present in the sediment passed through the tea filter, a secondary process cyclone filter 35 may be further added to separate and remove the sand component.

Industrial Applicability The present invention utilizes a continuous centrifuge, a flocculant tank, an electric reaction tank, and an incubation tank to efficiently utilize the industrial centrifugal separation method semi-setting device that can minimize environmental pollution and maximize the capacity for real-time purification treatment. The probability is very high.

In the present invention, the sediment inhaled by the dredger in the sediment storage tank is put into a flocculation agent of harmless components, the sediment is rapidly aggregated and separated by the centrifugal centrifugal separation method, and the continuous centrifuge, the electric reaction tank and the electric flotation tank are provided. The centrifugal centrifugal separation technology that suits the conditions has the effect of centrifuging and cleaning the sediment quickly and cleanly by adding coagulant of harmless components in real time.

Another effect of the present invention is that the separation liquid discharged from the continuous centrifuge has a concentration of 100ppm of fine suspended matter and the surrounding area is the port area, etc. In the area where there is a possibility of damaging fisheries and fish farms due to the existence of caged fish farms in the surrounding waters, or where the concentration of fine suspended solids in the surrounding waters is required to be less than 100ppm, Through the purification process using a pressurized floatation tank, the concentration of fine suspended solids can be treated to about 20ppm, which can be achieved as the wastewater treatment standard of sewage treatment plant, and it is required in the level of water quality or dredging area that can be directly discharged to the surrounding waters of dredging. Depending on the cleanliness of the treated water In order to adsorb soluble components such as sulfur components and organic phosphorus remaining in the water, the sediment is separated and purified economically and quickly by selective operation in consideration of the degree of purification such as passing through a steelmaking slag filter.

Another effect of the present invention is to achieve a sediment semi-setting device that can be environmentally restored using primers, such as environmentally friendly polymer coagulants, harmless to the human body without pollution of water.

Claims (12)

In the dredge sediment purification device using centrifugal separation, A suction pump installed in the dredger to suck the sediment deposited on the seabed; A continuous centrifuge for purifying the suspended matter contained in the sucked sediment using centrifugal force; And Dredged sediment purification device consisting of an electric reaction tank for decomposing and flocculating the suspended solids purified by the continuous centrifuge using electrolysis. In the dredge sediment purification device using centrifugal separation, A suction pump installed in the dredger to suck the sediment deposited on the seabed; A deposit storage tank for storing the sucked deposit before purifying the deposit sucked by the suction pump; Means for injecting a predetermined amount of flocculant to stir and flocculate the deposits stored in the deposit reservoir and stirring with a stirrer; And Dredge sediment purification device consisting of a continuous centrifuge for purifying the flocculated suspended matter using a centrifugal force. The method according to claim 1, Dredged sediment purification device further comprising a deposit storage tank for storing the sucked sediment before injecting the sediment sucked by the suction pump in a continuous centrifuge. The method according to claim 3, It is installed adjacent to the sediment storage tank, a certain amount of flocculant is injected into the sediment storage tank, Dredged sediment purification device further comprises a stirrer to stir the sediment and the flocculant so that the sediment storage tank stored sediment is suspended and rapidly aggregated by the flocculant. The method according to any one of claims 2 to 4, Dredged sediment purification device further comprises a bottom centrifuge to remove the large foreign substances, including oyster shell and gravel contained in the sediment sucked by the suction pump and deposit storage. The method according to any one of claims 1, 3 and 4, The treated water decomposed and coagulated and purified by the electric reaction tank generates microbubbles with compressed air at high pressure, and the generated microbubbles are blown into the treated water to collect suspended matter with microbubbles and float to the top to remove the suspended matter. Dredge sediment purification device further comprising a pressurized floatation. The method according to any one of claims 1, 3 and 4, Dredged sediment purification device further comprising a cartridge filter for filtering the fine particles contained in the treated water by installing a cartridge having a pore size necessary to increase the cleanliness of the treated water purified by the electric reaction tank. The method according to claim 7, Dredged sediment purification device further comprises a steelmaking slag filter for adsorbing and removing organic nitrogen, organic phosphorus and sulfur in order to remove soluble harmful substances contained in the treated water passing through the cartridge filter. The method according to claim 2, A bottom centrifugal separator for removing large foreign substances including oyster shells and gravel included in the sediment sucked between the suction pump and the deposit storage tank; And A dredged sediment purification device further comprising an electric reactor for decomposing, flocculating, and purifying suspended solids purified by a continuous centrifuge using electrolysis. The method according to claim 9, Pressurized flotation to remove the suspended solids by removing the suspended solids by generating the fine bubbles with the compressed water at high pressure compressed air by the electric reaction tank, and by spraying the generated fine bubbles into the treated water to float the floating material with the fine bubbles. Dredge sediment purification device further equipped with a tank. The method according to claim 9 or 10, Dredged sediment purification device further comprising a cartridge filter for filtering the fine particles contained in the treated water by installing a cartridge having a pore size necessary to increase the cleanliness of the treated water decomposed and coagulated by the electric reaction tank. The method according to claim 11, And a steelmaking slag filter for adsorbing and removing organic nitrogen, organic phosphorus, and sulfur in order to remove soluble harmful substances contained in the treated water passing through the cartridge filter.

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