KR102040734B1 - Dredged soil treatment system including impedance measuring unit and treating method of dredged soil using the same - Google Patents

Abstract

The present invention relates to a dredged soil treatment system comprising: an elution tank into which an eluent is injected; a sedimentation tank connected to the elution tank through a transfer pipe to receive the dredged soil into which the eluent is injected, and precipitating the dredged soil from which the heavy metal is eluted; a neutralization-coagulation tank connected to the sedimentation tank through a transfer pipe, and receiving and neutralizing the settled dredged soil; a dehydration apparatus connected to the neutralization-coagulation tank through a transfer pipe to dehydrate the neutralized dredged soil; and an impedance measuring unit installed in at least one of the transfer pipes. The impedance measuring unit comprises: a pipe installed in the transfer pipe; and an impedance signal generator and an impedance signal receiver installed on the inner wall surface of the pipe.

Description

Dredged soil treatment system including impedance measuring unit and dredged soil treatment method using same {DREDGED SOIL TREATMENT SYSTEM INCLUDING IMPEDANCE MEASURING UNIT AND TREATING METHOD OF DREDGED SOIL USING THE SAME}

The present invention relates to a dredged soil treatment system and a dredged soil treatment method using the same, and more particularly, to a dredged soil treatment system including an impedance measuring unit and a dredged soil treatment method.

Marine pollution occurs through various routes. In particular, in the case of ports, various pollutants such as heavy metals, oils, and organic matters are deposited during the movement of logistics, which causes serious pollution. In addition, a large amount of contaminants are deposited on the coast due to wastewater and marine pollutant dumping from the rivers.

Odors arise from ports and coasts due to contaminated sediments. In addition, there is a risk that the contaminated sediments accumulate heavy metals in fish and fish and have a serious effect on those who consume them. Moreover, the decay of polluted sediments causes many problems in fisheries, such as disturbing marine ecosystems and reducing the number of birds.

The port removes contaminated soil and at the same time performs dredging work periodically to berth large ships. The mixture of dredged soil and dredged water collected during the dredging process contains various sediments, so purification is essential for reuse.

More complete purification of the dredged soil requires analysis of the amount of dredged soil to be treated or the components it contains. Conventionally, a dredged soil sample was taken at a specific time to analyze the amount of dredged soil and the amount and components contained therein. However, this method is not accurate. This is because the amount and composition of dredged soil to be treated changes in real time.

In particular, in order to automate the dredged soil purification process using artificial intelligence, a method for analyzing dredged soil in real time is essential.

An object of the present invention is to provide a dredged soil treatment system that can measure the amount and components of the dredged soil to be purified.

On the other hand, other unspecified objects of the present invention will be further considered within the range that can be easily inferred from the following detailed description and effects.

Dredged soil treatment system according to an embodiment of the present invention for achieving the above object is an elution tank is injected; A sedimentation tank connected to the elution tank and a transfer pipe to receive the dredged soil into which the eluent is injected to settle the dredged soil from which the heavy metal is eluted; A neutralization and agglomeration tank connected to the sedimentation tank and a transfer pipe to neutralize the dredged soil which is precipitated; A dehydration apparatus connected to the neutralization / aggregation tank and a transfer pipe to dehydrate the neutralized dredged soil; And an impedance measuring unit installed in at least one of the transfer pipes, wherein the impedance measuring unit includes: a pipe installed in the transfer pipe; It includes an impedance signal generator and an impedance signal receiver installed on the inner wall surface of the pipe.

In one embodiment, the impedance signal generator may be disposed in the lower center portion of the pipe, the impedance signal receiver may be disposed in the upper center portion of the pipe.

In one embodiment, the impedance signal generator is disposed in the lower center portion of the pipe, the impedance signal receiver includes a plurality, the plurality of impedance signal receivers are spaced apart from the lower portion of the pipe from the upper center portion at predetermined intervals. Can be arranged.

The impedance signal generator may include a first impedance signal generator disposed at a lower center portion of the pipe and a second impedance signal generator disposed at one lower side of the pipe, and the impedance signal receiver may include the A first impedance signal receiver disposed to face the first impedance signal generator at an upper center portion of the pipe, and a second impedance signal receiver disposed to face the second impedance signal generator at the other bottom of the pipe.

In one embodiment, the impedance signal generator or the sensor surface of the impedance signal receiver may be arranged to protrude from the wall surface. In this case, the impedance signal generator or the impedance signal receiver may further include a connection member disposed between the protruding portion and the wall surface to prevent the solids deposited on the protruding portion.

Dredged soil treatment system according to an embodiment of the present invention for achieving the above object uses a dredged soil treatment system described above. Lee ?, Dredged soil processing method, comprising the steps of generating a signal from the impedance signal generator; Receiving a signal at the impedance signal receiver; Time-series error correction of the received signal; And filtering the time-series error corrected signal.

In the dredged soil treatment system according to an embodiment of the present invention, by installing an impedance measuring unit in a transfer pipe or a dredged soil discharge pipe, whether the full pipe of the transfer pipe or the dredged soil discharge pipe, the moisture content or ionization component of the dredged soil passing through the transfer pipe or dredged soil discharge pipe Can be.

That is, by using the dredged soil system according to an embodiment of the present invention, it is possible to improve the purification efficiency by accurately performing the preliminary analysis required for the dredged soil purification process in real time, and further provide a cornerstone of automation of the dredged soil purification process.

On the other hand, even if the effects are not explicitly mentioned here, it is added that the effects described in the following specification and the provisional effects expected by the technical features of the present invention are treated as described in the specification of the present invention.

1 is a schematic diagram of a dredge soil treatment system according to an embodiment of the present invention.
2 is a schematic perspective perspective view of an impedance measuring unit installed in a transfer pipe or a dredged soil discharge pipe of a dredged soil treatment system according to an embodiment of the present invention.
Figure 3 is a schematic cross-sectional view for explaining the measurement of the level of the mixture of the dredged soil and dredged water flowing through the transfer pipe or dredged soil discharge pipe using the impedance measuring unit according to the first embodiment.
4 is a schematic cross-sectional view of the impedance measuring unit according to the second embodiment.
5 is a schematic cross-sectional view of the impedance measuring unit according to the third embodiment.
※ The accompanying drawings show that they are illustrated as a reference for understanding the technical idea of the present invention, by which the scope of the present invention is not limited.

In the following description of the present invention, when it is determined that the subject matter of the present invention may be unnecessarily obscured by the person skilled in the art with respect to the related well-known functions, the detailed description will be omitted.

The present invention relates to a dredged soil treatment system. In the present invention, the soil subject to the purification process is mainly sediments or dredged sediments (hereinafter referred to as dredged soil) in ports and coasts, but the object of the present invention is not limited to marine dredged soil, It may also be applicable to contaminated soil.

In particular, the dredged soil treatment system of the present invention is described on the basis of being mounted on a purification vessel, but depending on the embodiment may be installed and operated onshore.

1 is a schematic diagram of a dredge soil treatment system according to an embodiment of the present invention.

Referring to Figure 1, the dredged soil treatment system 100 of the present invention is a multi-stage particle size separation unit (10, 20), elution tank (30, 40), sedimentation tank (50), neutralization / coagulation tank (60) and dewatering unit (70). The dredged soil is transferred between the particle size separation unit (10, 20), the elution tank (30, 40), the sedimentation tank (50), the neutralization / aggregation tank (60) and the dewatering unit (70). Are transported through.

Marine dredged soil contains a combination of sand, silt, clay, and other foreign matter such as waste. In this embodiment, pretreatment filters out large particles of greater than 0.075 mm, including waste. In the pretreatment process, a separation unit such as a drum screen or a magnetic separator may be used, and the pretreatment process may be variously changed, and thus detailed description thereof will be omitted.

Multi-stage particle size separation unit (10, 20) is to separate the dredged soil of less than the reference particle size from the dredged soil of 0.075mm or less after pretreatment. The reference particle size may be set differently according to the properties of the dredged soil for performing the purification process. That is, the particle size distribution and the contaminant phase of the dredged soil may be sampled to set the reference particle size to, for example, 0.03 mm or less or 0.01 mm or less. For example, when 0.03 mm is used as a reference particle size, particle size separation may be performed through a particle size separator that separates only 0.03 mm or less of dredged soil immediately. However, there is a problem that the efficiency is degraded when the dredged soil is separated into the standard granularity level at one time. This is stepwise, i.e. separating the dredged soil below the reference particle size in multiple stages. As the particle size separator, a cyclone may be used or a vibrating screen may be used. The vibrating screen is finely inclined and continuously applies vibration to the mesh-type screen by using a motor and a cam. The vibrating screen allows only particles below the desired particle size to be separated. The vibrating screen is a well-known member, and detailed description thereof will be omitted.

Specifically, the first particle size separator 10 primarily separates dredged soil of 0.05 mm or less from dredged soil of 0.075 mm or less. The second particle size separator 20 separates the dredged soil of 0.03 mm or less again from the dredged soil discharged from the first particle size separator. In addition, a vibration screen that can separate only dredged soil of 0.01 mm or less can be installed. If only the final particle size criteria are determined, how many times the intermediate step is rough may vary depending on the embodiment.

Dredged soil below the standard particle size after the particle size separation is transferred to the elution tank to be described later. Dredged soils larger than the standard particle size can be used as fill material. Of course, dredged soils larger than the standard particle size will have to be re-examined and recycled only if the pollution is below acceptable levels. In this embodiment, since the contamination level is determined beforehand by examining the degree of contamination of the dredged soil by particle size, the particle size larger than the standard particle size is assumed to be less than the allowable level. However, once again, the contamination may be investigated to take further action. Dredged soil below the standard particle size has a large specific surface area, so heavy metals are adsorbed or bound, and thus the contamination is relatively high. For dredged soils below the standard particle size, heavy metal treatment is required. In particular, the heavy metals in question include six hazardous metals such as chromium (Cr), arsenic (As), zinc (Zn), copper (Cu), lead (Pb), and cadmium (Cd).

Dredged soil below the standard particle size is transferred to the first eluting tank 30 to elute the heavy metal primarily from the dredged soil, and dredged soil is again transferred to the second eluting tank 40 to elute the heavy metal again. The first elution tank 30 and the second elution tank 40 are connected to the eluent tank 31 and the elution aid tank 32, respectively, to receive the eluent and the elution aid. And the alkalase may be supplied to adjust the pH of the eluent. In addition, agitators 36 and 46 are installed in the first elution tank 30 and the second elution tank 40, respectively, so that the eluent and the dredged soil are well mixed with each other. In addition, pH sensors 35 and 45 are installed in the first elution tank 30 and the second elution tank 40. The pH in the elution tank is continuously measured using the pH sensors 35 and 45, and the pH of the eluent is maintained at a level of 4.0 to 5.0. When the pH in the elution tank falls, the pH can be maintained by interrupting the supply of the eluent. In the second elution tank, however, a pH sensor may be selectively provided.

An inorganic acid or an organic acid can be used as an eluent. Sulfuric acid, hydrochloric acid and the like can be used as the inorganic acid, and citric acid can be used as the organic acid. When an organic acid is used as the eluent, hydrogen peroxide may be used as the elution aid.

In addition, in the present embodiment, as in the multi-stage particle size separation unit described above, the elution tank is also separated into two and the elution is performed in multiple stages. This is because dissolution efficiency is more excellent when heavy metal elution is performed twice in the same manner as in the present embodiment, compared to using a single elution tank having a large capacity of the sum of the first and second elution tanks.

When the heavy metal elution is completed in the elution tank (30, 40), the dredged soil together with the eluent is transferred to the settling tank (50). In the sedimentation tank 50, the dredged soil is settled to the bottom by staying the eluent and dredged soil for a certain time, only the eluent from which dredged soil is removed remains in the supernatant. The eluent equal to the immersion tank can be returned to the first elution tank for reuse.

The dredged soil settled in the sedimentation tank 50 is transferred to the neutralization and agglomeration tank 60 and accommodated, and the neutralizing agent and the coagulant are introduced into the neutralization and agglomeration tank 60 from the neutralizing tank 68 and the coagulant tank 69, respectively. . When the dredged soil is transported in the sedimentation tank 50, some of the eluent is transferred together, and the acidic eluent is also buried in the dredged soil. The neutralizer is used to raise the pH of the dredged soil to the emission standard. An inorganic substance such as sodium hydroxide or potassium hydroxide may be used as the neutralizing agent, or sodium citrate which is an organic neutralizing agent that is the same as the citric acid used as the eluent may be used. The flocculant also causes the dredged soils to agglomerate by forming particles.

On the other hand, the transfer pipe (L) is connected to the upper portion of the immersion tank (50) from the lower portion of the second elution tank 40, the first pump 52 is installed in the transfer pipe (L). The first pump 52 transfers the fine soil and the eluent in the second elution tank 40 to the immersion tank 50. And the transfer pipe L is provided between the immersion tank 50 and the neutralization and aggregation tank 60, and the 2nd pump 62 is provided in the transfer pipe L. As shown in FIG.

The agglomerated dredged soil is finally transported to the dewatering unit 70 and discharged after dehydration treatment. The treated dredged soil can be recycled into civil and building materials such as fill material.

In order to recycle the treated dredged soil as civil and building materials, it is necessary to completely remove the pollutants contained in the dredged soil. This is because the amount and type of pollutants contained in dredged soil should be identified in real time to take the necessary measures.

The present invention is the transfer pipe (L) between the dissolution tank (30, 40) and the particle size separator (10, 20), the transfer pipe (L) between the first dissolution tank 30 and the second dissolution tank (40) , A transfer tube L between the elution tanks 30 and 40 and the sedimentation tank 50, a transfer tube L between the sedimentation tank 50 and the neutralization / aggregation tank 60, or a neutralization / aggregation tank ( Impedance measuring unit 90 is installed in the transfer pipe (L) between the 60 and the dehydration unit (70). The impedance measuring unit 90 measures whether the transfer pipe L is full or level, the moisture content of the dredged soil passing through the transfer pipe L, or the ionization component contained therein.

However, the present invention is not limited thereto, and the impedance measuring unit 90 of the present invention may be installed in a transfer pipe for discharging the dredged soil separated by a larger particle size from the particle size separators 10 and 20, or dredged soil from the dewatering unit 70. Can also be installed in the transfer pipe for discharging.

2 is a schematic perspective view of an impedance measuring unit 90 installed in a transfer pipe or a dredged soil discharge pipe of a dredged soil treatment system according to an embodiment of the present invention.

The impedance measuring unit 90 includes a pipe 91, an impedance signal generator 92 and an impedance signal receiver 92 installed in the pipe 91.

Pipe 91 is connected to the conveying pipe (L) to which the dredged soil is conveyed. For example, the pipe 91 may be installed in the transfer pipe using a flange.

Impedance measurement generates a signal of a specific frequency band (eg, a signal of 1 to 3 GHz) in the impedance signal generator 92, and when the signal is received by the impedance signal receiver 93 after passing through the measurement object, a signal analyzer (Signal) This is done by analyzing the signal. Since different materials have different dielectric characteristics, impedance measurement uses the difference in the received signal to the difference in dielectric properties of each material to determine whether the feed tube is full or not, or the level of dredged soil To analyze.

3 is a schematic cross-sectional view for explaining the level of the mixture of the dredged soil and dredged water flowing through the transfer pipe or dredged soil discharge pipe using the impedance measuring unit (90A) according to the first embodiment.

Referring to FIG. 3, the impedance signal generator 92 of the impedance measuring unit 90A according to the first embodiment is disposed in the lower center portion of the pipe 91, and the impedance signal receiver 93 is located above the pipe 91. It is arranged in the center.

When the impedance signal generator 92 generates a signal S of a specific frequency band, the signal S is transmitted to the impedance signal receiver 93 after passing through the measurement target. Since air has a significantly different dielectric property from the mixture of dredged soil and dredged water, the signal S received when the transfer pipe L or the pipe 91 is full and when it is not.

On the other hand, since the dredged soil and dredged water to be measured have many solids, it is most preferable that the sensor surfaces of the impedance signal generator 92 and the impedance signal receiver 93 coincide with the inner wall of the pipe 91. In reality, however, it is not easy to match completely. However, at least the sensor surface of the impedance generator 92 and the impedance signal receiver 93 should not be located inside the wall surface of the pipe 91. When the sensor surfaces of the impedance signal generator 92 and the impedance signal receiver 93 are located inward of the wall surface of the pipe 91, the solids contained in the dredged soil and the dredged water are the impedance signal generator 92 and the impedance signal receiver ( 93 may accumulate on the sensor surface. In this case, the performance of the impedance signal generator 92 and the impedance signal receiver 93 is significantly reduced.

Therefore, the sensor surface of the impedance signal generator 92 and the impedance signal receiver 93 is disposed to protrude from the wall surface of the pipe 91. Particularly, in the present invention, the sensor surfaces of the impedance signal generator 92 and the impedance signal receiver 93 are arranged to protrude from the wall surface of the pipe 91 to prevent the solids from being deposited, and at the same time, the impedance signal generator 92 The signal transfer rate between the impedance signal receivers 93 is improved.

However, when the sensor surfaces of the impedance signal generator 92 and the impedance signal receiver 93 protrude, solids may be deposited on the side surfaces of the impedance signal generator 92 and the impedance signal receiver 93. Accordingly, the connecting member 95 may be disposed between the protruding portion of the impedance signal generator 92 and the impedance signal receiver 93 and the wall surface 91. The connection member 95 may use a rubber ring or silicon, but is not limited thereto. However, it is preferable to use a material having excellent chemical resistance as the connecting member 95. The connection member 95 connects the wall 91 with the impedance signal generator 92 and the protruding portion of the impedance signal receiver 93 in a curved line, so that the wall 91 and the impedance signal generator 92 and the impedance signal are curved. The solids are prevented from being deposited between the protruding portions of the receiver 93. The connecting member 95 may be applied to other embodiments described later.

4 is a schematic cross-sectional view of the impedance measuring unit 90B according to the second embodiment.

Referring to FIG. 4, in the impedance measuring unit 90B according to the second embodiment, an impedance signal generator 92 is disposed at a lower center portion of the pipe 91, and the impedance signal receivers 93a to 93f are pipes 91. A plurality of are arranged to be spaced apart from the lower portion of the upper center portion by a predetermined interval.

When the impedance measuring unit 90A of the first embodiment is used, it is possible to check whether the transfer pipe or the pipe 91 is full, but it is difficult to confirm the specific water level.

However, in the impedance measuring unit 90B of the second embodiment, since the impedance signal receivers 93a to 93f are arranged for each height as shown in FIG. 4, the water level measurement is possible. That is, the position of the current water level can be confirmed by the difference between the signals of S ₁ to S _{4 and} the signals of S ₅ and S ₆ .

5 is a schematic cross-sectional view of the impedance measuring unit 90C according to the third embodiment.

Referring to FIG. 5, the impedance measuring unit 90C according to the third embodiment includes a first impedance signal generator 92a disposed at the lower center portion of the pipe 91 and a second one disposed at the lower side of the pipe 91. A first impedance signal receiver 93a disposed at an upper central portion of the pipe 91 so as to face the first impedance signal generator 92a and a second lower portion of the pipe 91; And a second impedance signal receiver 93b disposed to face the impedance signal generator 92b.

In order to analyze the ionization components contained in the dredged soil, the signal generated by the impedance generator should not cross the air layer. Therefore, when the pipe 91 is not a full pipe, the water content analysis and the component analysis are not easy with the first impedance signal generator 92a and the first impedance signal receiver 93a respectively disposed at the upper and lower center portions of the pipe 91.

Therefore, in the impedance measuring unit 90C according to the third embodiment of the present invention, whether the pipe or the pipe is fully filled is measured using the first impedance signal generator 92a and the first impedance signal receiver 93a, and at the same time dredged soil The component analysis of the second impedance signal generator (92b) and the second impedance signal receiver (93b) is used. As a result, it is possible to carry out both water content analysis and compositional analysis of dredged soils or not. However, the operation of the first impedance signal generator 92a and the first impedance signal receiver 93a and the operation of the second impedance signal generator 92b and the second impedance signal receiver 93b are parallax in order to minimize the disturbance of the signal. Can be achieved.

The dredged soil treating method according to another embodiment of the present invention is performed by using the dredged soil treating system including the impedance measuring unit of the first to third embodiments described above.

First, a step of generating a signal in the impedance generator is performed. The signal generates a signal in a specific frequency band, for example a frequency band of 1 to 3 GHz.

The generated signal is received at an impedance signal receiver. The received signal first performs time series error correction in a separate controller (not shown), and filters the time series error corrected signal.

By using this, it is possible to analyze whether pipes or pipes are fully filled, the level of dredged soil and dredged water, the water content in the dredged soil, or the ionization component.

The protection scope of the invention is not limited to the description and expression of the embodiments explicitly described above. In addition, it is again noted that the scope of protection of the present invention may not be limited due to obvious changes or substitutions in the technical field to which the present invention pertains.

Claims (7)

Elution tank into which the eluent is injected;
A sedimentation tank connected to the elution tank and a transfer pipe to receive the dredged soil into which the eluting agent is injected to precipitate the dredged soil from which the heavy metal is eluted;
A neutralization and agglomeration tank connected to the sedimentation tank and a transfer pipe to neutralize and agglomerate the sedimentary dredged soil;
A dehydration device connected to the neutralization / aggregation tank and a transfer pipe to dehydrate the neutralized dredged soil; And
And an impedance measuring unit installed on at least one of the transfer pipes.
The impedance measuring unit,
A pipe installed in the transfer pipe; And
An impedance signal generator and an impedance signal receiver installed on an inner wall of the pipe;
The impedance signal generator is disposed in the lower center portion of the pipe,
A plurality of impedance signal receivers are included,
The plurality of impedance signal receivers are disposed in the dredged soil processing system spaced apart from the lower portion of the pipe at a predetermined interval spaced apart.
The method of claim 1,
An impedance signal generator disposed in the lower center portion of the pipe is called a first impedance signal generator, and a plurality of impedance signal receivers spaced at predetermined intervals from the lower portion of the pipe to the upper center portion are called a plurality of second impedance signal receivers. In the case of
And a second impedance signal generator disposed at one lower side of the pipe, and a second impedance signal receiver disposed at the other lower side of the pipe to face the second impedance signal generator.
The method of claim 1,
Dredge soil processing system is disposed so that the sensor surface of the impedance signal generator or the impedance signal receiver protrudes from the inner wall surface.
The method of claim 3,
And a connecting member disposed between the protruding portion of the impedance signal generator or the impedance signal receiver and the wall surface to prevent solid matter from being deposited on the protruding portion.
As a dredged soil treatment method using the dredged soil treatment system according to any one of claims 1 to 4.
Generating a signal at the impedance generator;
Receiving a signal at the impedance signal receiver;
Time-series error correction of the received signal; And
Filtering the time series error-corrected signal; Dredged soil processing method comprising a.
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