KR20140016708A - Vessel for remedying polluted soil in marine or river - Google Patents

Abstract

The present invention relates to a vessel for purifying polluted soil in order to perform a purification inside the vessel by dredging for the polluted soil which is deposited in ocean or river. The vessel for purifying polluted soil according to the present invention forms a accommodating tub on a deck in order to accommodate dredging water which flows with dredging soil when dredging in ocean or river, purifies the dredging soil, the dredging water, and the vessel which has an outlet for discharging the dredging water, and includes a purification system in order to discharge the processed dredging water to the outlet of the vessel.

Description

{Vessel for remedying polluted soil in marine or river}

TECHNICAL FIELD The present invention relates to an environmental technology for restoring contaminated soil in the ocean, and more particularly, to a purifying vessel for recovering a contaminated soil capable of instantly restoring marine polluted soil on site.

According to the data released by the Ministry of Land, Transport and Maritime Affairs in 2004 ~ 2009, the pollution level of 15 major ports in Korea such as Mukho Port, Samchok Port, Kowloon Port, Busan Nam Port and Ulsan Port is serious.

Marine pollution occurs through various routes. Especially, it is known that heavy sediments are seriously polluted by various pollutants such as heavy metals, oil, and organic materials deposited in the port during the movement of logistics. In addition, various pollutants are deposited on the coast through wastewater flowing into the river and marine dumping.

Corruption of these polluted sediments can cause bad odors in coastal areas, and can also seriously affect people who consume heavy metals in seafood. Also, corruption of sediments causes disturbance of fish ecosystem, which leads to many problems in fisheries such as decrease of population.

On the other hand, marine sediments are dredged periodically for the purpose of removing polluted soil from the harbor, and for dredging large ships. The amount of dredged soil reaches 30 million rubles per year. As described above, dredged soil is severely contaminated with heavy metals and organic matter, and therefore, purification treatment is essential for recycling.

However, not only are the types of pollutants in dredged soil varied, but also particle size (sand, silt, shellfish, iron scraps, general waste, heavy metals, etc.) There are many difficulties. Conventional soil remediation technology was developed to target specific pollutants such as heavy metals, oil, and organic matter, so it was treated by using single method among physical treatment, chemical treatment, and biological treatment. However, pollutants such as marine sediments were complex The existing technology or treatment facility could not be used directly.

Above all, in order to purify dredged soil, dredged soil must be transported to the place where the purification treatment facility is located. Since the transportation cost is very high, the transportation cost is substantially exerted in the entire cost of dredging the dredged soil. I am experiencing more difficulties. In other words, dredged dredged soil and sea water are pumped together in the dredging of the port. In the total dredged amount, dredged soil is only 10 ~ 20%, and seawater accounts for 80 ~ 90%. Since the sea water and dredged soil must be transported to the land treatment facility, the transportation cost is increased, and in the case of the purification company which needs to perform the treatment within the limited cost, the problem of the actual dredging and seawater purification is neglected.

Therefore, it is required to develop a complex technology for restoring marine sediments contaminated with various materials to a level that can be recycled, and to develop a facility capable of immediately treating dredged soil on the spot.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a method for recovering sediments that are contaminated with heavy metals, organic matter, The present invention is directed to providing a purifying line for treating a contaminated soil on which a purification treatment facility is mounted on a ship.

In order to accomplish the above object, the present invention provides a purifier for on-site treatment of a contaminated soil, comprising: a receiving tank formed on a deck to receive dredged water sucked together with dredged dredged soil in a sea or a river, ; And a purification treatment system for purifying the dredged soil and the dredged water and discharging the treated dredged water to the discharge port of the ship.

And the purification treatment system is connected to the dredger, dredged soil and dredged water flows in, a sorting unit for sorting the dredged soil into a plurality of groups by particle size, and dredged soil and dredged water of any one group selected by the sorting unit is introduced, A first magnetic separator for first separating magnetic materials contained in the dredged soil using a magnet, a cyclone apparatus for sorting dredged soil not attached to the magnet in the first magnetic separator into a plurality of groups by particle size; Dredged soil and dredged water having a relatively small particle size among the groups selected by the cyclone device are temporarily accommodated to settle heavy particles, and settling separation tank consisting of a vessel of the vessel, and not settling in the sedimentation separation tank. Fine particles and dredging water flow in and are connected to the coagulant tank to The main treatment tank to agglomerate the fine particles through, the first bubble generator to generate bubbles, and the fine particles and dredging water aggregated in the main treatment tank, the bubble is supplied from the first bubble generator to receive the fine Filtered by receiving a floating separator to separate and float the particles, the sediment settled in the sedimentation separator and the main dehydrator for receiving and dewatering the discharged from the flotation and the dredged water from which the wound is removed. It is provided with a filter unit for discharging to the discharge port of the vessel.

In addition, in one embodiment of the present invention, disposed between the cyclone apparatus and the sedimentation separation tank in the transport path of the dredged soil and dredged water, and generates bubbles to desorb oil adhered to the soil particles of the dredged soil Further comprising a second bubble generator and an auxiliary treatment tank connected to at least one of the coagulant tank for supplying a coagulant to agglomerate fine particles in the dredged soil to perform oil desorption or coagulation treatment according to the contaminating properties of the dredged soil. do.

In addition, in one embodiment of the present invention, in order to restore the dredged soil contaminated with heavy metal, disposed between the cyclone apparatus and the sedimentation separation tank on the transport path of the dredged soil and dredged water, the group selected from the cyclone apparatus Among them, a dredged soil having a relatively small particle size and dredged water is further introduced, and further includes a second magnetic separator for attaching and separating magnetic material not separated from the first magnetic separator. And a magnetic agent tank for injecting a magnetic agent into the second magnetic separator may be provided.

The cyclone apparatus used in the present invention is to separate the particle size by sequentially introducing the dredged soil, and a plurality of cyclones formed in the upper portion is cylindrical, the lower portion is formed in a conical shape, arranged below the plurality of cyclone groups And a vibrating screen for passing only particles of a predetermined size or less and vibrating and dehydrating particles exceeding a predetermined size, and a return pipe for introducing the particles passing through the vibrating screen back into a plurality of cyclones, The dredged soil sequentially passes through the plurality of cyclone groups, and finally only particles having a predetermined particle size or less are transferred to the sedimentation separation tank. The particles finally transferred to the sedimentation tank through the plurality of cyclones are fine soil having a size of 0.075 mm or less.

A pipeline is connected between the sedimentation separator and the main dehydrator, and a bogie for reciprocating the bottom of the sedimentation separator to flow sediment precipitated in the sedimentation separator into the pipeline.

In addition, the main dehydrator is for separating the particle size by sequentially infiltrating the sediment precipitated in the sedimentation tank, the upper portion is a cylindrical, the lower portion is formed of a plurality of cyclones, the lower side of the plurality of cyclones It is provided with a vibrating screen disposed to be passed only to the particles of a predetermined size or more and vibrates the particles exceeding a certain size, and a return pipe for introducing the particles passing through the vibrating screen back into a plurality of cyclones The sediment is sequentially passed through the plurality of cyclone groups, and only particles having a predetermined particle size or less are finally transferred to the flotation tank. The plurality of cyclone groups form one unit, and in the first cyclone group, particles having a particle size of 0.074 mm or less are discharged to the upper part, and then the particles are introduced into the second arranged cyclone group and have a particle size of 0.03 mm or less. Is discharged to the top, and finally flowed into the cyclone to discharge the particles up to 0.01mm, and the particles discharged from each cyclone are introduced into the subsequent cyclone or separately through the bypass line It can be discharged.

And a sludge hopper into which the floating matter transferred by the skimmer is injected. The sludge hopper according to claim 1, wherein the sludge hopper is a sludge hopper.

In another embodiment of the present invention, a microorganism treatment liquid tank for supplying a treatment liquid containing microorganisms for biological purification treatment to the auxiliary treatment tank is further provided. The microbial treatment liquid containing the microorganism is mixed with the ballast tank of the ship, and the ballast tank is used as the microorganism treatment liquid tank by connecting with the auxiliary treatment tank.

The purifier for on-site treatment of contaminated soil according to the present invention has a purification treatment system installed on the ship, and the polluted soil is dredged in the ocean or river, and the treated water can be immediately purified, and the treated water can be restored back to the site. It is economical because it does not.

In addition, sediment contamination of marine or river is complexly contaminated by heavy metals, organic matter, and oil. However, this purification treatment system has an advantage that it can treat various pollution sources.

In addition, the use of a multistage cyclone device and microbial treatment can drastically reduce the amount of waste, thereby minimizing the secondary contamination due to reclamation of waste on land.

FIG. 1 is a photograph of a clean line for treating a contaminated soil according to an embodiment of the present invention.
Fig. 2 is a schematic configuration diagram of the polluted-soil purifying line disclosed in Fig. 1. Fig.
FIG. 3 is a schematic flow chart of the purification treatment performed in the purification treatment system mounted on the pollutant-side groundwater purification line shown in FIG. 1;
4 is an actual photograph of the sorting unit (drum screen) shown in Fig.
5 is an actual photograph of the first magnetic force separator shown in Fig.
6A and 6B are actual photographs and configuration diagrams of the cyclone device shown in FIG.
7 is an actual photograph of the second magnetic force separator shown in FIG.
8 is an actual photograph of the sedimentation separation tank shown in Fig.
9 is an actual photograph of the main dehydrator (multistage cyclone) shown in Fig.
10 is an actual photograph of the floating separation tank shown in Fig.
11 is an actual photograph of the centrifugal separator shown in Fig.
12 is a schematic diagram of the sand filter shown in Fig.
13 is a distribution chart of microorganisms in the microbial treatment liquid used in an embodiment of the present invention.
14 to 16 are experimental results of the biological purifying treatment applied to the purifying line for the on-site contaminated soil treatment according to the present invention, wherein FIG. 14 is a table for the organic matter removal efficiency, FIG. 15 is a table for the total order eliminating efficiency, 16 is a table for total phosphorus removal efficiency.

As a part of the 'Future Ocean Industrial Technology Development Project' of the Korea Ocean Research & Development Institute under the Ministry of Land, Transport and Maritime Affairs, the dredged polluted soil deposited in the ocean or the river is immediately treated at the site and then the sand is recycled as aggregate, (Hereinafter, referred to as 'dredged water') was designed and manufactured to actually restore the contaminated soil to its original position. Fig. 1 shows an actual photograph of a polluted-air purifying line designated as " Daesung No. 15 ". Daesung No. 15 is 63 meters long and 1,100 tons, which is designed to handle 500 tons per hour (400 to 450 tons of seawater and 50 to 100 tons of dredged soil). The present invention is not a technology to be developed, but a patent application based on a purified cable actually produced.

Hereinafter, with reference to the accompanying drawings, a description will be given in more detail of the construction and purifying process of a purifying line (hereinafter referred to as 'purifying line') for on-site contaminated soil treatment according to an embodiment of the present invention.

Fig. 2 is a schematic structural view of the pollutant-on-site pollutant treatment line disclosed in Fig. 1, wherein (a) is a schematic plan view of the pollutant line and (b) is a schematic side view of the pollutant line. Fig. 3 is a schematic flow chart of the purification treatment performed in the purification treatment system mounted on the cleaning wire for the contaminated soil treatment shown in Fig. 1. Fig.

Referring to FIGS. 2 and 3, a purifier 900 according to an embodiment of the present invention includes a ship 800 and a purifier system 700. The ship 800, as described above, has a length of approximately 62 meters and a length of 1,100 tons. The ship 800 is provided with a discharge port (not shown) for returning the dredged water to the ocean or the stream. In the center of the ship 800, a receiving tank (used as a sedimentation separation tank to be described later) for receiving the dredged soil and the dredged water together is formed. The receptacle was formed by concave modification of the deck of the vessel (800).

The purification treatment system 700 includes a sorting unit 10 (drum screen). The sorting unit 10 receives dredged pumped dredged soil and dredged water from the dredger and selects foreign matter from the dredged soil. In the present invention, the sorting unit 10 removes foreign matters by separating the dredged soil by particle size. Specifically, the three-phase drum screen 10 can be used to treat 500 tons per hour. The three-phase drum screen 10 is provided with two screens made of a cylindrical mesh net, as shown in the drum screen photograph of FIG. The first screen 11 disposed at the center can pass only particles having a particle size of 13 mm or less. The second screen 12, which surrounds the first screen 11, can pass only particles of 4 mm or less. When the drum screen 10 is rotated, the dredged soil and the dredged water are pushed to the inner wall of the screen by the centrifugal force, and the foreign matter of 13 mm or more such as refuse is filtered on the first screen 11, 2 The screen 12 separates foreign matter of 4 mm or more such as gravel, shells and the like. The remaining sand and dredged water pass through the second screen 12 and are discharged downward. More than 4 mm of material is collected by a conveyor belt (not shown) and transported overland.

The dredged soil and the dredged water that have been filtered out of the drum screen 10 fall down naturally and flow into the first magnetic separator 20 disposed at the lower portion of the drum screen 10. Since the purifying system 700 is mounted on the ship 800, the respective devices are disposed so as to minimize the use of power, and the first magnetic force separator 20 is disposed on the lower side of the drum screen 10 So that the dredged water and the dredged soil fall down naturally, thereby minimizing the use of power.

A photograph of the first magnetic separator 20 is shown in FIG. A wet magnetic separator (20) used in the present invention is a known device in which a belt is wound around a cylindrical magnet (21), and the belt is circulated while the magnet is rotating. Among the dredged materials placed on the belt, And is removed from the belt when the belt is moved away from the influence of the magnetic force. Since the non-magnetic substance is not attached to the magnet, the belt falls off at the end of the magnet upon rotation and is separated. A demagnetizer may be used to facilitate separation of the magnetic material from the belt. In this embodiment, the magnet 21 has a magnetic force of about 3,000 to 4,000 gauss, and two 2.2-kw magnets are disposed to process 500 tons per hour. However, not all the magnetic material is separated from the first magnetic force separator 20, but mainly the iron pieces and the iron pieces are separated, and the weak magnetic material such as heavy metals is separated from the second magnetic separator to be described later. The magnetic material such as iron pieces separated in the first magnetic separator 20 is collected by a conveyor belt (not shown) and transported onshore. The material not adhered to the magnet 21 passes through the cyclone 30, Lt; / RTI >

Actual photographs and configuration diagrams of the cyclone device 30 employed in this embodiment are shown in Figs. 6A and 6B.

The cyclone device 30 is for receiving the dredged soil discharged from the first magnetic force separator 20 and separating the dredged soil by granularity. The cyclone apparatus (30) includes a plurality of cyclone units (31), a vibration screen (32), and a return pipe (33).

Five of the cyclone units 31 constitute one unit, and the dredged soil is separated from the granular material while sequentially passing through the five cyclone units 31. The upper part of the cyclone group 31 is cylindrical, and the lower part is formed in a conical shape, and when dredged soil and dredged water propelled at a high speed through an inlet formed in the cylindrical part, the dredged soil and dredged water form an inner wall of the cyclone machine 31. Rotating accordingly, the light material in the cone is discharged through the upper portion of the cyclone group 31 in the upward flow, the heavy material is discharged to the lower portion of the cyclone group (31). In this embodiment, the cyclone is operated at an operating pressure of approximately 0.8 to 1.2 kg / cm ² .

The material discharged upward from the first arranged cyclone was introduced into the second arranged cyclone and sequentially passed through the five cyclone groups. In the finally disposed cyclone, particles having a particle size of about 0.075 mm or less were collected in the upper . More specifically, in the five cyclone groups 31, particles exceeding 0.1 mm, particles larger than 0.095 mm, particles larger than 0.09 mm, particles larger than 0.08 mm, particles larger than 0.075 mm are sequentially formed on the lower portion of the cyclone . Particles having a particle size of 0.075 mm or less are discharged to the upper portion of the cyclone and then transferred to the auxiliary treatment tank 40 to be described later.

As described above, the particles exceeding 0.075 mm separated through the lower part of the plurality of cyclone groups 31 are mainly recyclable sand components, and the particles of 0.075 mm or less discharged through the upper part of the cyclone 31 are clogged , Silt, or pollutants such as organic matter, oil, and heavy metals (hereinafter referred to as "fine soil" for the sake of convenience of explanation, such as clay and pollutants having a diameter of 0.075 mm or less).

Particles having a particle size of 0.075 mm or more and discharged to the lower portion of the cyclone machine 31 are conveyed to the vibration screen 32 provided on the lower side of the cyclone machine 31. The vibration screen 32 is made of a mesh net. The sand is dehydrated while being placed on a mesh net (particles having a particle diameter of 0.074 mm or less) while being vibrated, and then moved to the land to recycle the aggregate.

Minute fine particles having a particle size of 0.075 mm or less may be left in the sand. These fine particles may be collected in the lower portion of the vibration screen 32 through the mesh screen of the vibration screen 32, And the fine grained particles having a particle size of 0.075 mm or less are separated as much as possible by introducing them into the cyclone 31 and separating them again.

As described above, the micro-soil is a contaminant itself, or a clay or silty fine soil particle having a large surface area. In addition, not only is there a lot of contaminants in the fine soil particles, but also it is not easy to separate the contaminants from the fine particles. In the present invention, fine soil having a particle size of 0.075 mm or less is defined as a contaminant and treated in a later-described auxiliary treatment tank, floatation tank, and the like.

The fine soil and dredged water of 0.075 mm or less through the cyclone device 30 are introduced into the auxiliary treatment tank 40. Since the cyclone device 30 is disposed above the auxiliary treatment tank 40, the dredged water flows into the auxiliary treatment tank 40 from the cyclone device 31 without depending on any additional power.

When the fine soil is contaminated with heavy metal, the fine soil and the dredged water are again magnetically separated from the cyclone 31 through the bypass line through a second magnetic force separator 50 to be described later, ≪ / RTI > If there is no heavy metal contamination, fine soil particles and dredged water flow into the auxiliary treatment tank 40 together.

First, the case of contamination with a heavy metal will be described.

Various fine metals are contained in fine soil including mineral particles and iron oxide. The second magnetic force separator (50) separates the heavy metal that has not been separated from the first magnetic force separator (20). An actual photograph of the second magnetic separator employed in this embodiment is shown in Fig. The second magnetic separator 50 is a device known as a High Gradient Magnetic Separator (HGMC). In this embodiment, a permanent magnet having a high magnetic force of 6,000 to 7,000 gauss is used to select a heavy metal at a high level do. The second magnetic force separator 50 also uses the principle that, when the micro-soil transferred by the belt reaches a region where the magnetic force is applied, the magnetic body is attached to the magnet and the non-magnetic body is transferred as it is.

Also, in this embodiment, the separation efficiency can be improved by mixing the dispersant and the magnetic agent before the fine soil is introduced into the second magnetic separator 50. The dispersant is for dispersing the fine soil forming the mouth. In other words, iron oxide and manganese oxide contained in fine soil are positively charged in a general soil environment. When pH is adjusted to make the soil environment less than PZC (point of zero charge) or adsorption of anion having strong adsorption power such as phosphate , The fine soil attached to the iron oxide is dispersed while being separated by the repulsive action.

In addition, the magnetic agent can be supplied from the magnetic agent tank 51 to magnetize the fine soil. The addition of a natural agent increases the magnetics susceptibility of soil particles in order to increase the efficiency of magnetic separation for heavy metal-containing mineral particles.

There is a high correlation between the magnetizing power of soil particles and the heavy metal content. Higher magnetism means more heavy metals than low mineral. In addition, iron oxide and manganese oxide, and heavy metals in residual form are relatively high in magnetizing power as silicates or silicate minerals, so that they can be removed using a magnetic field to purify fine soil.

Magnetizing agents can convert non-magnetic particles (mainly minerals) in soil particles into magnetism and increase the magnetizing power of minerals with weak magnetic force. When magnetite (Fe ₃ O ₄ ), which is a ferromagnetic mineral, is added as magnetizing agent, magnetite acts as a bridge between fine soil particles and makes the whole micro-soil particles magnetized. In addition to the fact that the magnetite itself acts as a bridge, it is also possible to dissolve the iron (Fe) component contained in the magnetite so as to bridge the fine soil particles and make them magnetic.

In addition, 1,2-iron salts (FeCl ₂ , FeCl ₃ , FeSO ₄ and the like) are dissolved in a solvent to adjust the pH to an alkaline pH, and then air is introduced and heated to a fine soil to magnetize the soil particles . Here, the Fe component also acts as a bridge between the soil particles to cause magnetism.

As described above, in the embodiment of the present invention, fine soil particles including heavy metals can be removed in the second magnetic separator 50 as much as possible by injecting a dispersant and / or a magnetic agent.

The fine soil containing heavy metal or heavy metal separated by the second magnetic separator 50 is collected through the conveyor belt and then transported to the land, and the remaining fine soil flows into the auxiliary treatment tank 40 together with the dredged water. Since the second magnetic separator 50 is disposed above the auxiliary treatment tank 40, the fine soil and the dredged water naturally flow into the auxiliary treatment tank 40 regardless of the power.

As described above, when the fine soil separated from the cyclone is contaminated with a heavy metal, the fine soil is passed through the second magnetic separator 50, but if the heavy soil is not contaminated, (40).

The auxiliary treatment tank 40 can perform complex purification treatment by receiving fine soil and dredged water. That is, the auxiliary treatment tank 40 is connected to the second bubble generator 41 and the flocculant tank 42, and can receive fine bubbles and coagulant if necessary. In the auxiliary treatment tank (40), an agitator (43) is installed so that the coagulant and the fine soil can be stirred with each other.

Microsoils can be classified into four types according to the pollution characteristics. That is, it can be classified into micro-soils contaminated with heavy metals, micro-soils contaminated with oil, micro-soils complexed with heavy metals and oil, and general micro-soils.

In the purification treatment system 700 adopted in the present invention, the purification treatment process may be different according to the above four contamination characteristics. As described above, the two types of fine particles containing heavy metals are separated by the second magnetic separator 50). In the case of the fine soil containing oil and / or heavy metals, it is necessary to coagulate the fine particles through the coagulant like the general fine soil. In the case of the conventional fine soil, the coagulation process is performed in the auxiliary treatment tank 40, In the case of the fine soil contaminated with oil, the coagulation process is performed in the main treatment tank 90 to be described later, not in the auxiliary treatment tank 40.

Therefore, in the case of general fine soil in which pollution of oil or heavy metals is within the allowable standard, coagulation is carried out in the auxiliary treatment tank (40), but in the case of the fine soil contaminated with oil, fine bubbles are used in the auxiliary treatment tank And try to desorb oil. In the case of fine soil contaminated with only heavy metal, the auxiliary treatment tank 40 may be transported to a sedimentation separation tank 60, which will be described later, without performing a separate process, or may be transported through the auxiliary treatment tank 40 through a bypass line It may be transferred to the sedimentation separation tank 60 directly.

As a result, the auxiliary treatment tank 40 serves as a flocculation tank for flocculating the fine particles by injecting a flocculant in the case of general fine soil, and as a oil separation tank for removing oil by injecting minute bubbles in the case of oil contaminated fine soil . In the case of heavy metal contaminated fine soil, no special process is performed. For example, if the heavy metal and the oil are complex-contaminated, the auxiliary treatment tank 40 functions as an oil separation tank.

As the coagulant to be input into the auxiliary treatment tank 40, a cationic coagulant having multi-charges such as calcium and magnesium is used. When the flocculant is added and the fine soil and the flocculant are stirred by the agitator 43, the fine particles are aggregated. Since the fine particles have a large surface area and a large amount of contaminants are adsorbed and they are not easily sorted due to particle separation or specific gravity separation, the fine particles can be aggregated in the dredged water through the coagulant, have.

When the auxiliary treatment tank 40 is utilized as an oil separation tank, micro-bubbles are supplied to the auxiliary treatment tank 40. In the second bubble generator 41, a micro-bubble having a size of 3 to 10 μm is generated and supplied to the auxiliary treatment tank 40. Ultra-fine grained soil penetrates between micro-soil particles and contaminants (especially oil, organic matter), thereby removing contaminants from fine soil particles. In other words, the ultrafine grains penetrating between the fine soil particles and the contaminants are destroyed by the magnetic pressure collapse, and shock waves are generated, and the contaminants are separated from the fine soil particles by the shock waves.

As described above, the fine soil contaminated with oil and / or organic matter is transferred to the sedimentation separation tank 60 to be described later in a state where contaminants are desorbed from the auxiliary treatment tank 40. In the case of general fine soil, Particles are transported to the sedimentation separation tank 60 in a mutually agglomerated state.

An actual photograph of the sedimentation separation tank 60 is shown in FIG. A receiving tank made by concavely modifying the deck of the ship 800 is used as the sediment separating tank 60 and is formed to be longer than about 20 m so as to provide a sufficient hydraulic retention time for heavy particles in the dredged water to settle. In the case of general fine soil, since the fine particles have aggregated in the auxiliary treatment tank 40, the aggregated fine soil is settled downward in the sedimentation separation tank 60. However, in the case of oil contaminated fine soil, since the coagulant has not been introduced yet, the oil / organic matter desorbed is not sedimented but remains suspended in the dredged water.

8, the dredged water and fine soil are transferred to the central supply tower 64 of the sedimentation separation tank 60 through the two pipelines 61 connected to the auxiliary treatment tank 40. On the upper side of the sedimentation separation tank (60), a water channel structure (62) having a sawtooth shape is provided. When the water level structure 62 is disposed at a constant height and the water level of the sedimentation separation tank 60 reaches this height, the dredging water is transferred to the main treatment tank 90 to be described later through the water channel structure 62. The toothed portion 63 at the upper end of the water channel structure 62 is for filtering the float.

Further, a balancer 65 is provided at the lower end of the sedimentation separation tank 60. The bogie 65 has a rod shape having a length corresponding to the bottom width of the sedimentation separation tank 60 and is reciprocatable at the bottom of the sedimentation separation tank 60. The bogie 65 pushes the precipitate settled on the bottom of the sedimentation separation tank 60 to a discharge port (not shown) in the lower part of the sedimentation separation tank 60 and feeds it to a main dehydrator 80 to be described later through a pipeline . The precipitate settled in the sedimentation separation tank (60) is mainly composed of clay, silt and contaminants, and is dehydrated and separated in the main dehydrator (80).

The main dehydrator 80 separates the precipitate precipitated in the sedimentation separation tank 60 and performs particle separation again. An actual photograph of the main dehydrator 80 is shown in Fig. The main dehydrator 80 is the same as the cyclone device 30 described above in that the main dehydrator 80 is a multistage cyclone. However, in the main dehydrator 80, three cyclone groups are constituted as one unit to separate the soil particles more finely than the cyclone apparatus 30 described above. Particles having a particle size of 0.074 mm or less are separated in the first cyclone unit 81 disposed first, and particles of the particles transferred from the first cyclone unit 81 are separated from the second cyclone unit 82 disposed in the second space. Particles having a particle size of 0.03 mm or less are separated, and the third cyclone 83 disposed finally separates particles of 0.01 mm or less.

A screen (not shown) is disposed under each cyclone of the main dehydrator 80. The screen is made up of a mesh network through which particles of 0.01 mm or less pass, and so- The granules are separated from the cyclone. The fine grains on the screen are collected and dehydrated and transported overland.

In the main dehydrator 80, the fine soil finally classified to a particle size of 0.01 mm or less is mostly polluted. This fine soil is generally transferred to the main treatment tank 90, but can be disposed of through a separate discharge line connected to the upper outlet of each cyclone. For example, if particles of 0.03 mm or less, which are separated from the second cyclone 82, are mostly pollutants, a separate discharge line may be connected to the upper portion of the second cyclone 82 to collect And may be discarded.

 In the main treatment tank 90, the dredged water and the unsettled fine soil are introduced from the sedimentation separation tank 60, and the fine soil classified to a particle size of 0.01 mm or less flows in from the main dehydrator 80. The main treatment tank 90 serves as a flocculation tank for flocculating contaminants such as fine soil particles, organic matter, and oil floating in the dredged water by receiving the flocculant from the flocculant tank 42.

However, as described above, since the coarse aggregation process is performed in the auxiliary treatment tank 40 in the case of general fine soil not contaminated with heavy metal, oil, or organic matter, the coagulation process may not be performed in the main treatment tank 90, . However, in the case of fine soil contaminated with oil or heavy metals, the coagulation process is not performed in the auxiliary treatment tank 40, so the main soil treatment tank 90 is used.

An agitator 91 is provided in the main treatment tank 90 like the auxiliary treatment tank 40 so that the fine soil and the flocculant are rotated so as to be evenly stirred. Fine soil particles and contaminants flocculate by flocculants. However, in the main treatment tank 90, the agitator continues to operate and does not stay for a long time, so that the agglomerated particles are not settled but transferred to the floating separating tank 100 to be described later.

The floating separator 100 (see FIG. 10) floats fine particles (mainly organic matter or oil contaminants) agglomerated in the main treatment tank 90 by using air bubbles. To this end, the first bubble generator 101 is connected to the floating separation tank 100. The first bubble generator 101 generates micro bubbles of 0.0003 to 0.001 mm in the same manner as the second bubble generator 41 described above and supplies the micro bubbles to the floating separator 100.

The microbubbles are attached to the agglomerated microparticles and perform the role of floating them up to the surface (so-called 'bubbling action'). In addition, as described above, it also plays a role of separating contaminants from fine soil by using a self-compacting topography.

A skimmer 102 is installed above the floating separation tank 100 to remove contaminants and fine particles floating on the water surface of the floating separation tank 100 by microbubbles. The skimmer 102 has a long bar shape along the width direction of the floating separation tank 100 and is disposed in the vicinity of the water surface of the floating separation tank 100 and is reciprocally movable. The skimmer 102 pushes and removes contaminants that float on the water surface of the floating separation tank 100 through a sludge hopper (not shown) through reciprocating movement.

The sludge hopper is connected to a centrifugal dehydrator (70). The centrifugal dehydrator 70 rotates and dehydrates the contaminants using centrifugal force. Dehydrated contaminants have a moisture content of 30-40% and are formed into sludge cakes and transported to the land and disposed of.

The dredged water discharged from the floating separation tank 100 is ultimately filtered through the filter unit 110 (FIG. 12) and returned to the sea or river through a discharge port (not shown) provided in the ship 800. As the filter unit in the present invention, a plurality of sand filters are used. The sand filter 110 is filled with a filtration material such as sand inside the housing, and the dredged water is filtered while passing through the sand in the sand filter.

The dredged water that is finally discharged satisfies the water quality level required by the environmental regulations because most of heavy metals, oil and organic matter are removed.

Meanwhile, in the present invention, as described above, a biological treatment process may be added in order to remove heavy metals, organic substances, and oil through physical and chemical purification treatment, but to more completely perform the purification treatment.

The great advantage of introducing biological treatments is that they can be transported overland to reduce the amount of waste to be landfilled. In biological treatment, the amount of waste can be reduced because microorganisms digest organic matter as an energy source.

In the present embodiment, the biological treatment can be performed in the auxiliary treatment tank 40 or the main treatment tank 90. That is, the treatment liquid containing the microorganism can be supplied to the auxiliary treatment tank 40 or the main treatment tank 90 to remove the organic matter. Particularly, in this embodiment, a ballast tank of the ship 800 can be used without separately providing a microorganism treatment liquid tank (not shown). That is, the microbial treatment liquid can be mixed and supplied to the seawater contained in the ballast tank.

The biological treatment process will be described in this embodiment.

Table 1 in Fig. 13 is a distribution table of microorganisms in the microbial treatment liquid used in one embodiment of the present invention.

The microbial treatment liquid used in the present invention is a cultivated indigenous microorganism in Korea, and includes photosynthetic bacteria, yeast, lactic acid bacteria, actinomycetes and filamentous bacteria, and is composed of approximately 130 bacteria and yeast.

This microorganism was sampled from soil samples (bamboo humus, rumen microbes, hardwood humus) and mixed into medium (rice bran, rice husk, sawdust, egg shell, shell peel, peat moss) pulverized at 80 ~ 120 mesh, 60%, and cultured on a soil of semi-sagged state for 90 days. The cultured medium was mixed with 30% by weight of rice bran, 20% by weight of rice husk and 30% by weight of sawdust, and the water content was adjusted to 60%, and 0.01% of the total medium weight was inoculated. Lt; / RTI > After 3 weeks of fermentation, the mixed microbial strains were separated from the powdery microorganisms having a moisture content of 8% or less, and then a stock solution was prepared according to the intended use.

Microorganisms isolated from the microbial treatment solution were identified by automatic microscopy and then identified by automatic identification system. Biochemical tests were carried out to identify 99.0% homology of Canadian boidini and Saccharomyces cerevisiae.

The microorganisms of the present microbial treatment solution showed positive reaction to the nitrate assimilation reaction in the biochemical test and showed that ammonium nitrate, nitrite, organic nitrogen source, urea, amino acid type nitrogen source were all available, . It was also found that phenol decomposition enzyme was produced and the growth rate was fast. The various microorganisms identified here are coexisting with each other and show synergistic effect, which contributes to the improvement of removal rate of RCM rhdwjddptj pollutants.

The present applicant conducted an experiment to purify marine polluted sediments using a microbial treatment liquid. Marine polluted sediments were sampled from the fish market in Busan, and only the supernatant below 10 μm was used. The properties of the influent are shown in table 1 below and operating conditions are shown in table 2.

Experimental results on the organic material removal efficiency are shown in the table of FIG. The COD concentration of the input water is 550 to 650 mg / L. After one month of seeding, the COD concentration of effluent was 61.2 mg./L, and the concentration was lowered to 18 mg / L with the passage of time, and it showed stable removal tendency and was not affected by salinity.

Further, experimental results for examining the nitrogen removal efficiency are shown in the table of FIG. The total nitrogen concentration of the incoming water is 6 to 8.5 mg / L. After one month of seeding, the concentration of T-N in effluent was decreased from 1.166 mg / L to 0.067 mg / L with the elapse of operation, and the removal tendency was stable.

Experimental results on the total phosphorus removal efficiency are shown in the table of FIG. The total phosphorus concentration of the incoming water is 8 to 10 mg / L. After one month of seeding, the concentration of T-P in the effluent was decreased from 0.505 mg / L to 0.0242 mg / L with the elapse of operation, indicating a stable removal tendency.

As described above, it has been confirmed that contaminants, nitrogen and phosphorus in the seawater can be effectively removed by using the microbial treatment liquid in this embodiment.

Of course, in addition to the above-mentioned biological treatment, heavy metals and oil in the marine soils are much lower than the environmental regulations by the magnetic separation, particle separation, oil separation, sedimentation separation and float separation processes. Respectively.

As described above, according to the present invention, since a purification treatment system is mounted on a ship, the polluted soil can be dredged in the ocean or river, and the treated water can be immediately purified and the treated water can be restored back to the site. .

In addition, sediment contamination of marine or river is complexly contaminated by heavy metals, organic matter, and oil. However, this purification treatment system has an advantage that it can treat various pollution sources.

In addition, the use of a multistage cyclone device and microbial treatment can drastically reduce the amount of waste, thereby minimizing the secondary contamination due to reclamation of waste on land.

10 ... three-phase drum screen 20 ... first magnetic separator
30 ... (multi-stage) cyclone device 40 ... auxiliary treatment tank
50 ... second magnetic force separator 60 ... settling and separating tank
70 ... Centrifugal dehydrator 80 ... Main dehydrator (multi-stage cyclone)
90 ... Main processing tank 100 ... Float separation tank
110 ... Sand filter 800 ... Ship
700 ... Purification processing system 900 ... Purification line for on-site contaminated soil

Claims (16)

A vessel having a receiving vessel formed on a deck for receiving dredged water sucked together with dredged dredged soil in a sea (coastal) or a river (lake, reservoir), and having a discharge port for discharging the dredged water; And
And a purification treatment system for purifying the dredged soil and dredged water and discharging the treated dredged water to the discharge port of the vessel. The method of claim 1,
The purification processing system includes:
A sorting unit connected to the dredger to draw dredged soil and dredged water and sorting the dredged soil into a plurality of groups by particle size,
A first magnetic separator for introducing a selected group of dredged soil and dredged water from the sorting unit and primarily separating the magnetic material contained in the dredged soil using a magnet,
A cyclone apparatus for sorting the dredged soil which is not attached to the magnet in the first magnetic separator into a plurality of groups by particle size;
A sedimentation separation tank comprising dredged soil and dredged water having a relatively small particle size among the groups selected by the cyclone apparatus to be temporarily accommodated to settle heavy particles, and containing a vessel of the vessel;
A main treatment tank for introducing fine particles and dredged water that have not been sedimented in the sedimentation separation tank and connected to a flocculant tank to coagulate the fine particles through the flocculant;
A first bubble generator for generating bubbles,
A floatation tank for receiving the fine particles and dredged water aggregated in the main treatment tank and supplying the bubbles from the first bubble generator to float the fine particles and separate the fine particles,
A main dehydrator for receiving and discharging sediment sedimented in the sedimentation separation tank and floating matters floated in the floating separation tank;
And a filter unit for filtering the dredged water from which the floating matter is removed, and discharging the dredged water to an outlet of the ship. 3. The method of claim 2,
Disposed between the cyclone apparatus and the sedimentation separation tank on the transport path of the dredged soil and dredged water,
The dredged soil is connected to at least one of a second bubble generator which generates bubbles for desorbing the soil particles of the dredged soil and the coagulant tank which supplies a coagulant to aggregate the fine particles in the dredged soil. Purification line for polluted soil on-site treatment, characterized in that it further comprises an auxiliary treatment tank for performing oil removal and flocculation treatment according to the contaminant properties. 3. The method of claim 2,
Disposed between the cyclone apparatus and the sedimentation separation tank on the transport path of the dredged soil and dredged water,
Dredge soil and dredged water having a relatively small particle size of the groups selected from the cyclone device is introduced, and further comprising a second magnetic separator for separating by attaching a magnetic material not separated from the first magnetic separator. Purification line for on-site treatment of contaminated soil. 5. The method of claim 4,
Purification line for polluted soil on-site treatment, characterized in that it further comprises a magnetization tank for injecting a magnetizing agent to the second magnetic separator. 3. The method of claim 2,
Wherein the sorting unit is a three-phase drum screen capable of sorting the dredged soil into three groups by particle size,
Wherein the sand particles in the dredged soil are included in the group having the smallest particle size and sorted. 3. The method of claim 2,
The cyclone device,
A plurality of cyclone units arranged in a cylindrical shape at an upper portion and conical at a lower portion and passing only particles of a predetermined size or smaller disposed below the plurality of cyclone units, A vibration screen for vibrating and dehydrating particles exceeding a predetermined size,
It is provided with a return pipe for introducing the particles passed through the vibrating screen back into the plurality of cyclones,
Wherein the dredged soil is sequentially passed through the plurality of cyclone groups, and only particles having a predetermined particle size or less are finally transferred to the sedimentation separation tank. The method of claim 7, wherein
Finally, the particles transported to the sedimentation tank through the plurality of cyclones are fine soil having a size of 0.075 mm or less. 3. The method of claim 2,
A pipeline is connected between the sedimentation separation tank and the main dehydrator,
Further comprising a bogie for reciprocating the bottom of the sedimentation separation tank and introducing sediment precipitated in the sedimentation separation tank into the pipeline. 3. The method of claim 2,
The main dehydrator
A plurality of cyclone units arranged at a lower side of the plurality of cyclone units and having a cylindrical shape and a lower portion formed in a conical shape; A vibrating screen for passing only particles and vibrating and dehydrating particles exceeding a certain size,
It is provided with a return pipe for introducing the particles passed through the vibrating screen back into the plurality of cyclones,
Wherein the sediment is sequentially passed through the plurality of cyclone groups and only the particles having a predetermined particle size or less are finally transferred to the main treatment tank. 11. The method of claim 10,
Wherein the plurality of cyclone groups form one unit,
In the first arranged cyclone, the particles having a particle size of 0.074 mm or less are discharged to the upper portion, and then the particles are introduced into the second arranged cyclone, and particles having a particle size of 0.03 mm or less are discharged to the upper portion. So that particles of 0.01 mm or less are discharged upward,
Particles discharged from each cyclone is introduced into the subsequent cyclone, or separately discharged through the bypass line purifier for field treatment of contaminated soil. 3. The method of claim 2,
A skimmer installed on an upper portion of the floating separator to reciprocate the floating separator in order to remove floating matters floating on the floating separator;
And a sludge hopper into which the floating matter transferred by the skimmer is introduced. The method of claim 12,
Further comprising a centrifugal dehydrator for dehydrating and discarding the waste supplied from the sludge hopper. The method of claim 3,
And a microbial treatment liquid tank for supplying a treatment liquid containing microorganisms for a biological purification treatment to the auxiliary treatment tank. 15. The method of claim 14,
And a microbial treatment liquid containing microorganisms in a ballast tank of the vessel, and connecting the ballast tank with the auxiliary treatment tank to use as a microbial treatment liquid tank. The method according to claim 2 or 3,
Bubbles generated in the first bubble generator and the second bubble generator is a purified soil for field treatment, characterized in that the fine bubbles having a particle diameter of 0.0003 ~ 0.001mm.

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