KR20140039478A - Vessel for remedying polluted soil in marine or river using biological treatment - Google Patents

Abstract

The present invention relates to a vessel for in-situ treatment of contaminated soil using a biological treatment, capable of dredging contaminated soil deposited in an ocean or a river, and purifying the contaminated soil inside the vessel. The vessel for in-situ treatment of contaminated soil, according to the present invention, is prepared with: an accommodation tub, formed on the deck to accommodate dredged water, sucked in with soil dredged from the ocean or a river; a vessel formed with an outlet for discharging the dredged water; and a purification system which purifies the dredged soil and water, and discharges the purified dredged water through the outlet.

Description

Vessel for remedying polluted soil in marine or river using biological treatment}

The present invention relates to an environmental technology for restoring contaminated soil in the ocean, and more particularly, to a purified vessel for contaminated soil restoration using biological treatment capable of immediately restoring marine contaminated 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.

Above all, in order to purify the dredged soil, the dredged soil must be transported to the place where the purification treatment facility is located. Since the transportation cost is very high, the transfer cost is a significant portion of the overall cost of the purification of dredged soil. I am having trouble. 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.

In addition, even when the dredged soil is purged using physical and chemical methods, if the amount of treated contaminant sludge increases, it is difficult to dispose of it.

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.

In addition, there is a demand for the development of a facility that can minimize the amount of sludge to be disposed of while carrying out purification treatment.

The present invention is to solve the above problems, after dredging sedimentary soil off the coast can be directly purified on site, and restored to a level capable of recycling the complex contaminated soil such as heavy metals, organic matter, oil, etc. The purpose of the present invention is to provide a purification vessel for on-site treatment of contaminated soil using biological treatment installed on a ship.

Purification line for the treatment of contaminated soil site using biological treatment according to the present invention for achieving the above object is accommodated on the deck to accommodate the dredged water sucked with the dredged soil when dredging in sea (coast) or river (hose, reservoir) The vessel is formed, the ship is formed with a discharge port for discharging the dredging water; And a purification treatment system for purifying the dredged soil and dredged water and discharging the treated dredged water to an outlet of the vessel.

The purification treatment system is connected to the dredger, dredged soil and dredged water is introduced, the sorting unit for sorting the dredged soil into a plurality of groups by the particle size, and the dredged soil and dredged water of any group selected by the sorting unit is introduced, A cyclone apparatus for sorting dredged soil into a plurality of groups by a particle size, an auxiliary treatment tank in which dredged soil and dredged water having a relatively small particle size among the groups selected by the cyclone apparatus are temporarily accommodated, and from the auxiliary treatment tank Temporarily receives the dredged soil and dredged water, and settles the heavy particles in the dredged soil, the sedimentation tank consisting of the vessel receiving vessel of the vessel, the fine particles and dredged water not sedimented in the sedimentation tank is introduced, the flocculant tank and A main treatment tank connected to aggregate the fine particles through the flocculant; A microbial treatment liquid tank for supplying a treatment liquid containing microorganisms for physical purification to at least one of the auxiliary treatment tank and the main treatment tank, a first bubble generator for generating bubbles, and the main treatment tank A floating separation tank for accommodating the fine particles and dredging water aggregated in the flotation, and receives the bubbles from the first bubble generator to float the fine particles to separate, and the sediment settled in the sedimentation separation tank and the floating separation tank It is characterized in that it comprises a filter unit for supplying the main dehydrator and the dredged water from which the injured material is removed and filtered to discharge the discharged to the discharge port of the vessel.

Purification vessel for on-site soil treatment using biological treatment according to the present invention is equipped with a purification treatment system on the ship dredged the soil in the ocean or river dredging and immediately purified and treated water can be restored back to the original site in the logistics There is an advantage of economic because it does not occur.

In addition, biological treatment allows the microorganisms to digest the contaminants, thereby minimizing secondary pollution due to landfill of waste.

In addition, the present invention has the advantage that it can treat all the various pollution sources such as oil, heavy metals.

1 is an actual photograph of a purification line for field treatment of contaminated soil using biological treatment according to an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram of a purification line for treating on-site soil using biological treatment disclosed in FIG. 1.
FIG. 3 is a schematic flowchart of a purification process performed by a purification treatment system mounted on a purification line for field treatment using contaminated soil 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 purification treatment applied to the purification line for field treatment using the biological treatment according to the present invention, FIG. 14 is a table relating to the organic matter removal efficiency, and FIG. 16 is a table regarding the 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, it will be described in more detail with respect to the configuration and purification process of the purified soil for field treatment (hereinafter referred to as "purification line") using biological treatment according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a purification line for on-site soil treatment using biological treatment disclosed in FIG. 1, (a) is a schematic plan view of a purification line, and (b) is a schematic side view of the purification line. 3 is a schematic flowchart of the purification process performed by the purification processing system mounted on the purification line for field treatment of the soil using the biological treatment shown in 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.

In the case of contaminated soil deposited in the ocean, it is common to be contaminated by organic matter, oil and heavy metals in combination. In the present invention, the main purpose is to treat the soil contaminated with nitrogen, phosphorus, organic matter through biological treatment, but as described above, the marine contaminated soil is a magnetic separator, oil-separation tank, etc. to solve the pollution by heavy metals and oils. Equipped with an optional unit to cope with heavy metals and oil pollution.

That is, in this embodiment, a process of removing heavy metals in the contaminated soil may be selectively added through the first magnetic separator 20 and the second magnetic separator 50 to be described later. However, if there is no heavy metal contamination through sample analysis, the first magnetic separator 20 may remove only foreign substances having a relatively large size such as iron or iron drift, and may not pass through the second magnetic separator 50. If it is determined that there is no contamination with the iron, the first magnetic separator 20 and the second magnetic separator 50 may not be incorporated into the process. If it does not pass through the first magnetic separator and the second magnetic separator, the dredged water and dredged soil passing through the drum screen 10 is directly introduced into the cyclone apparatus 30 to be described later.

In the following embodiments, a case in which the magnetic separation process is selectively added through the first magnetic separator 20 and the second magnetic separator 50 on the assumption that the contaminated soil is also contaminated by heavy metals will be described.

As described above, the dredged soil and dredged water filtered by the foreign matter in the drum screen 10 falls naturally and flows into the first magnetic separator 20 disposed under 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. Magnetic material such as iron drift separated from the first magnetic separator 20 is collected by a conveyor belt (not shown) and transported to the land, and the material not attached to the magnet 21 is a cyclone apparatus 30 to be described later. Is transferred to.

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 with a particle size of 0.075 mm or less are discharged to the top of the cyclone group.

Particles larger than 0.075 mm separated through the lower part of the plurality of cyclone groups 31 are mainly recycled sand components, and particles of 0.075 mm or less discharged through the upper part of the cyclone group 31 are clay, silt or Contaminants such as organic matter, oil and heavy metals (hereinafter, for convenience of explanation, clay and contaminants of 0.075 mm or less are collectively referred to as 'miseto').

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.

However, as described above, when the fine soil is contaminated by heavy metals, the fine soil and dredged water are separated from the cyclone group 31 through the second magnetic separator 50 to be described later through a bypass line. It flows into the auxiliary treatment tank 40. If there is no heavy metal contamination, fine soil particles and dredged water flow into the auxiliary treatment tank 40 together.

If the fine soil is contaminated by heavy metals, various heavy metals are contained in the 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.

It should be noted that if the fine earth separated from the cyclone group can exclude contamination by heavy metals, the fine earth will flow directly from the cyclone apparatus 30 into the auxiliary treatment tank 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 may function as an oil desorption tank by receiving microbubbles, and may function as a microbial digester by receiving a microbial treatment solution. Foil fractionation and biological treatment may be performed together in the auxiliary treatment tank 40.

The determination of which purification treatment to be performed in the auxiliary treatment tank 40 depends on the soiling characteristics of the fine soil. For example, if the fine soil is contaminated by oil, the auxiliary treatment tank 40 basically acts as an oil desorption tank, and if the contamination by oil can be excluded, the auxiliary treatment tank 40 mainly performs biological treatment. You may.

In order to perform a complex role as described above, the auxiliary treatment tank 40 is connected to the second bubble generator 41 can be supplied with microbubbles, it is connected to the microbial treatment tank and supply the microbial treatment liquid I can receive it. And the auxiliary treatment tank 40 is provided with a stirrer 43 to agitate the fine soil.

When the fine soil is also contaminated by oil and the auxiliary treatment tank 40 is utilized as an oil desorption tank, ultra-fine foam (micro bubble) is 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.

In addition, the microbial treatment solution may be added to the auxiliary treatment tank 40 to remove contaminants through the microbial digestion process. Such a process may be performed in the main treatment tank 90 to be described later. This will be described in detail.

As described above, the fine soil contaminated with oil (and / or organic matter) is transferred to the sedimentation separation tank 60 which will be described later with the contaminants detached from the auxiliary treatment tank 40.

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. Heavy particles are settled in the sedimentation separation tank (60), but the oil / organic desorbed from the auxiliary treatment tank (40) is mostly lighter than water, so the suspended particles in the sedimentation tank (60) do not settle and float in dredged water. Keep it.

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.

 Dredged water (supernatant) and fine soil that has not settled are introduced into the main treatment tank 90 from the sedimentation separation tank 60, and the fine soil classified to a particle size of 0.01 mm or less is introduced 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. In addition, the microbial treatment liquid may be connected to the microbial treatment liquid to receive biological treatment.

The flocculant is a cationic flocculant having a multi-charge such as calcium, magnesium. When the flocculant is added and the fine soil and the flocculant are stirred with the stirrer, the fine particles are agglomerated. Since the fine particles have a large surface area and are contaminated with a lot of pollutants, and are not easily selected by particle size separation or specific gravity separation, the fine particles are aggregated in dredged water through a flocculant to facilitate separation later. Fine soil particles and contaminants flocculate by flocculants. However, in the main treatment tank (90), the stirrer (91) continues to operate and does not stay for a long time, so that the aggregated particles are not precipitated and are transferred to the flotation separation 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.

On the other hand, in the present invention, as described above, the heavy metals, organics, oils are removed through physical and chemical purification treatment, but mainly, the pollutants such as organics, oils, etc. are removed through biological treatment.

The great advantage of biological treatment is that it can reduce the amount of waste to be landfilled and 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 (13)

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 a purification treatment system for purifying the dredged soil and dredged water and discharging the treated dredged water to an outlet of the vessel.
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 cyclone apparatus for introducing dredged soil and dredged water selected from the sorting unit to sort the dredged soil into a plurality of groups for each particle size;
An auxiliary treatment tank temporarily receiving dredged soil and dredged water having a relatively small particle size from among the groups selected by the cyclone apparatus;
A sedimentation separation tank which temporarily receives dredged soil and dredged water introduced from the auxiliary treatment tank, precipitates heavy particles in the dredged soil, and consists of a receiving tank of the vessel;
A main treatment tank into which fine particles and dredged water not settled in the sedimentation separation tank are introduced and connected with a coagulant tank to aggregate the fine particles through the coagulant;
A microbial treatment liquid tank for supplying a treatment liquid containing microorganisms for biological purification to at least one of the auxiliary treatment tank and the main treatment tank;
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;
Purification vessel for on-site soil treatment using biological treatment, characterized in that it comprises a filter unit for receiving the filtered dredged water from which the wound is removed and discharged to the discharge port of the vessel. The method of claim 1,
Mixing the microbial treatment liquid containing microorganisms in the ballast tank of the vessel, and the ballast tank is connected to at least one treatment tank of the auxiliary treatment tank and the main treatment tank to use as the microbial treatment liquid tank. Purification line for on-site treatment of contaminated soil using biological treatment. The method of claim 1,
The microbial treatment solution is purified soil for field treatment using biological treatment, characterized in that it comprises photosynthetic bacteria, yeast, lactic acid bacteria, actinomycetes and filamentous bacteria. The method of claim 1,
Is disposed between the sorting unit and the cyclone device,
Dredged soil and dredged water of any one group selected by the sorting unit is introduced into the contaminated soil using a biological treatment, characterized in that it further comprises a first magnetic separator for separating the magnetic material contained in the dredged soil first using a magnet Purification line for field treatment. 5. The method of claim 4,
Disposed between the cyclone apparatus and the auxiliary treatment 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 using biological treatment. 6. The method of claim 5,
Purification line for contaminated soil field treatment using a biological treatment, characterized in that it further comprises a magnetization tank for inputting the magnetizing agent to the second magnetic separator. The method of claim 1,
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,
Purification line for biological soil treatment using biological treatment characterized in that it comprises a return pipe for introducing the particles passed through the vibrating screen to a plurality of cyclones. The method of claim 1,
A pipeline is connected between the sedimentation separation tank and the main dehydrator,
Purification line for biological soil treatment using biological treatment, characterized in that the reciprocating movement is installed at the bottom of the sedimentation separation tank further comprises a bogie for introducing the sediment settled in the sedimentation separation tank into the pipeline. The method of claim 1,
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,
The sediment passes through the plurality of cyclones sequentially and finally only particles having a predetermined particle size or less are transported to the main treatment tank. 10. The method of claim 9,
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 subsequently arranged cyclone, or separately discharged through a bypass line, purification line for on-site soil treatment using biological treatment. The method of claim 1,
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;
Purification vessel for on-site treatment of contaminated soil using a biological treatment, characterized in that it comprises a sludge hopper into which the wounds transported by the skimmer is injected. The method of claim 1,
In the auxiliary treatment tank is connected to the second bubble generator purifying vessel for on-site soil treatment using biological treatment, characterized in that to remove the oil by receiving fine bubbles. 13. The method of claim 12,
Bubbles generated in the first bubble generator and the second bubble generator is a purified soil for field treatment using biological treatment, characterized in that the fine bubbles having a particle diameter of 0.0003 ~ 0.001mm.

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