KR20140137917A - System and method for remediation of soil being contaminated by concentrated heavy metal - Google Patents
System and method for remediation of soil being contaminated by concentrated heavy metal Download PDFInfo
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- KR20140137917A KR20140137917A KR20130059177A KR20130059177A KR20140137917A KR 20140137917 A KR20140137917 A KR 20140137917A KR 20130059177 A KR20130059177 A KR 20130059177A KR 20130059177 A KR20130059177 A KR 20130059177A KR 20140137917 A KR20140137917 A KR 20140137917A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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Abstract
The present invention relates to a heavy metal contaminated soil purification system and a purification method. More particularly, the present invention relates to a measuring unit for measuring the concentration of arsenic in a contaminated soil by measuring the degree of contamination based on countermeasure criteria; A pretreatment unit for mixing and dispersing the contaminated soil having an arsenic concentration within a specific range with water; A foreign matter remover installed in the pretreatment unit to remove foreign matter from the contaminated soil, to separate a polluted soil having a predetermined particle diameter or more into a purified soil, and to sort the polluted soil below the predetermined particle diameter; At least one multi-stage particle size sorter installed in the foreign material remover such that the polluted soil having a selected particle size smaller than the selected particle size is introduced and divided into particle sizes; A purifier installed in the multi-stage particle size sorter so as to be cleaned by the washing process water when the contaminated soil is classified into the less than the first specific particle size; A filtering device composed of a vacuum belt filter for separating and discharging the purified soil washed and influxed in the purification device and the washing process water contained in the purified soil; And a neutralization tank for neutralizing the washing process water discharged from the purification device and the filtering device.
Description
The present invention relates to a heavy metal contaminated soil purification system and a purification method. More specifically, contaminated soils having an arsenic concentration in the range of about 25 to 75 mg / kg are classified into three types according to the degree of contamination by a multi-stage particle size sorter according to the size of the particles. In order to purify heavy metals, It is possible to purify contaminated soil with arsenic concentration in the range of about 25 to 75 mg / kg more efficiently by using acid leaching using sulfuric acid as an eluting agent and purify heavy metal contaminated soil which can recycle all used washing process water It is about the method.
As the industry develops, soils are contaminated by harmful substances such as oil and heavy metals, and a composition or apparatus for cleaning the soil to restore such contaminated soil is being developed.
In Korean Patent Laid-Open Publication No. 2003-0005713 (published on Jan. 23, 2003), a washing apparatus for washing contaminated soil includes a washing tank and a main washing tank for repeatedly washing contaminated soil.
In addition, such a cleaning device has been adapted to be poured into a mixing tank to purify contaminated soil.
In this conventional technique, the purification treatment efficiency for each grain size of a general soil is considered as follows: granular soil such as gravel and stone having a grain size of 2 mm or more per grain size, neutral soil such as sand having a grain diameter of 0.075 mm to 2 mm, And fine clay such as clay. The economical range suitable for these granular soils, neutral soils, and micro-soils when they are purified is cost-effective and temporal efficiency is granite, the inefficient economic range is micro-soil, and the intermediate range is neutral soil.
However, the conventional purification apparatus uniformly purifies the soil without considering the difference in the degree of contamination depending on the nature and properties of the soil, that is, the difference in the particle diameters of the soil such as rice field, field, beach and mountain bottom, And there was a problem in the efficiency of the purification operation.
According to an embodiment of the present invention, there is provided a method of cleaning and purifying a contaminated soil having an arsenic concentration of about 25 to 75 mg / kg by measuring an arsenic concentration of a contaminated soil A suitable heavy metal contaminated soil purification system and a purification method.
According to one embodiment of the present invention, it is possible to select a soil having a large amount of microalgae and a neutral soil having a large amount of sand, and by finely separating a range of a particle having a high degree of contamination in the selected soil, The present invention provides a contaminated soil purification system and a purification method that can concentrate only intensive soil.
According to an embodiment of the present invention, the contaminated soil classified by the multi-stage particle size sorter having a particle size of about 0.075 to 4.75 mm is charged into the surface grinder to remove the heavy metal on the surface, Can be reduced, and a contaminated soil purification system and a purification method that can improve the purification efficiency and the speed are provided.
Further, according to one embodiment of the present invention, sulfuric acid is applied as a leaching agent in consideration of the concentration of heavy metals such as arsenic and soot by the particle size of the contaminated soil, thereby performing cleaning and purification processes. Thus, contamination A soil purification system and a purification method.
Sulfuric acid was used as an eluent for the washing process water separated and discharged from the filter press, and caustic soda (NaOH) was applied as a neutralizing agent in consideration of the concentration of arsenic contained in the washing process water, and Fe ) Modified activated carbon can be applied to efficiently neutralize the washing process water containing sulfuric acid and efficiently adsorb the arsenic contained in the washing process water, thereby conveying the used washing process water amount, A purification system and a purification method.
Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.
An object of the present invention is to provide a measurement unit for measuring the concentration of arsenic in a contaminated soil by measuring the degree of contamination based on a countermeasure standard; A pretreatment unit for mixing and dispersing the contaminated soil having an arsenic concentration within a specific range with water; A foreign matter remover installed in the pretreatment unit to remove foreign substances from the contaminated soil introduced into the polluted soil, to separate the polluted soil into particles of a predetermined size or more from the polluted soil, and to sort the polluted soil below the predetermined particle diameter; At least one multi-stage particle size sorter installed in the foreign material remover so that the polluted soil having a selected particle size smaller than a predetermined particle size flows into the soil and divided into particle sizes; A purifier installed to be cleaned by the washing process water when the contaminated soil that is classified into the less than the first specific particle diameter is introduced into the multi-stage particle size sorter; A filtering device composed of a vacuum belt filter for separating and discharging the purified soil washed and influxed in the purification device and the washing process water contained in the purified soil; And a neutralization tank for neutralizing the washing process water discharged from the purification device and the filtering device.
A surface grinder for introducing contaminating soil having a particle diameter equal to or larger than the first specific particle diameter by the multi-stage particle size separator to crush the surface; A hydrocyclone for classifying the particle size of the contaminated soil surface-ground by the surface grinder; And a particle size sorter for washing the contaminated soil having a particle diameter of at least the first specific particle size classified by the hydrocyclone by a washing process water to discharge the purified soil, wherein the particle diameter of the first specific particle diameter Can be treated as waste through a scum sedimentation concentrator and a scum filter press.
A coagulating sedimentation tank through which the polluted soil having a particle size smaller than the first specific particle diameter is introduced by the multi-stage particle size separator and coagulated and precipitated by the polymer flocculant; A concentrated tank in which the contaminated soil discharged from the coagulating sedimentation tank flows in and is concentrated; Wherein the concentrated soil discharged from the concentrating tank flows into the filter press so that concentrated soil discharged from the concentrated tank flows into the filter press, So that the washing water is dehydrated and discharged.
And a sedimentation concentrator provided between the acid tidal bath and the filter press for introducing the polymer flocculant and concentrating the purified soil discharged from the acid tanks.
The specific range is 20 to 80 mg / kg, the predetermined particle diameter is 4 to 5 mm, and the first specific particle diameter is 0.07 to 0.08 mm.
The contaminated soil, which is disposed between the multi-stage particle size separator and the flocculation and sedimentation tank, is classified by the multi-stage particle size separator into smaller than the second specific particle diameter smaller than the first specific particle diameter. And a mallflow tank for feeding the contaminated soil into the coagulating sedimentation tank.
And the second specific particle diameter is 0.015 to 0.025 mm.
A second object of the present invention is to provide a measurement unit for measuring the concentration of arsenic in a contaminated soil by measuring the degree of contamination based on a countermeasure standard; A pretreatment unit for mixing and dispersing the contaminated soil having an arsenic concentration within a specific range with water; A foreign matter remover installed in the pretreatment unit to remove foreign substances from the contaminated soil introduced into the polluted soil, to separate the polluted soil into particles of a predetermined size or more from the polluted soil, and to sort the polluted soil below the predetermined particle diameter; At least one multi-stage particle size sorter installed in the foreign material remover so that the polluted soil having a selected particle size smaller than a predetermined particle size flows into the soil and divided into particle sizes; A purifier installed to be cleaned by the washing process water when the contaminated soil that is classified into the less than the first specific particle diameter is introduced into the multi-stage particle size sorter; A filtering device composed of a vacuum belt filter for separating and discharging the purified soil washed and influxed in the purification device and the washing process water contained in the purified soil; A neutralization tank for introducing the washing process water discharged from the purifier and the filtering device to neutralize the washing process water; A pressurized floatation tank in which the neutralized washing process water flows in the neutralization tank to float the micro-soil to separate the micro-soil so that the washing process water is discharged; And an adsorption tower through which the washing process water discharged from the pressurized floating tank flows and adsorbs heavy metals contained in the washing process water, wherein the washing process water discharged from the adsorption tower is passed through the pretreatment unit, the foreign matter remover, And the apparatus is put into at least one of the apparatuses.
And a washing water storage tank for storing wash water discharged from the adsorption tower, wherein the washing water stored in the wash water reservoir is introduced into the pretreatment unit, the foreign matter remover, and the purifier.
And a neutralizing agent such as caustic soda is added to the neutralization tank.
And Fe (III) -substituted activated carbon is introduced into the adsorption column to adsorb heavy metals to the activated carbon.
A third object of the present invention is to provide a method for purifying contaminated soil, comprising the steps of measuring the concentration of arsenic in a contaminated soil in a measuring unit and injecting a contaminated soil having a specific arsenic concentration into the pretreatment unit; Mixing and dispersing the inflowing contaminated soil and water in the pretreatment unit; Filtering the contaminated soil introduced from the pretreatment unit with a predetermined particle diameter through a foreign material removing unit; Wherein the contaminated soil selected by the foreign material removing unit is less than the predetermined particle size and is classified into particle sizes by the multi-stage particle sizer; The contaminated soil classified by the particle size separator to a first specific particle size or more is charged into a surface grinder and surface-grounded, and the contaminated soil classified below the first specific particle diameter is injected into a purification apparatus to be purified; Separating and discharging the cleaning process water contained in the purified soil by injecting the purified soil that has been cleaned and inflowed into the purification apparatus into the filtering apparatus; And neutralizing the washing process water discharged from the purifying device and the filtering device into the neutralizing tank to neutralize the washing process water, wherein the contaminated soil discharged from the surface grinder is classified by the hydrocyclone, The contaminated soil having a particle diameter smaller than the first specific particle size is washed by the washing process water to discharge the purified soil, and the contaminated soil classified below the first specific particle diameter is removed by a scum precipitation thickener and a scum filter press And the treated soil is treated with waste.
The purifying step may include: a step in which a contaminated soil having a particle diameter less than the first specific particle diameter is injected into a flocculation sedimentation tank and coagulated and precipitated by a polymer flocculant; Concentrating the contaminated soil in the concentration tank; The concentrated soil is charged into an acid tank, and the soil is purified by acid leaching with sulfuric acid; And a step of introducing the purified soil into the filter press by being introduced into the precipitation concentrating tank and being precipitated and concentrated by the polymer flocculant.
The contaminated soil having a second specific particle diameter smaller than the first specific particle diameter may be characterized in that the washing process water is separated and discharged through the mull airtight vessel in the multi-stage particle size sorter, and then the contaminated soil is introduced into the coagulating sedimentation tank.
The neutralized washing process flows into the pressurized floating tank to float the micro-soil so as to separate the micro-soil so that the washing process water is discharged; And a step of allowing the washing process water discharged from the pressurized floating tank to flow into the adsorption tower to adsorb heavy metals contained in the washing process water, wherein the washing process water discharged from the adsorption tower is introduced into the pretreatment unit, And is introduced into at least one of the purifiers.
And a neutralizing agent such as caustic soda is added to the neutralization tank.
The specific range is 20 to 80 mg / kg, the predetermined particle diameter is 4 to 5 mm, the first specific particle diameter is 0.07 to 0.08 mm, and the second specific particle diameter is 0.015 to 0.025 mm.
Storing washing process water discharged from the adsorption tower in a washing water storage tank; And a step of supplying the cleaning process water stored in the wash water reservoir to the pretreatment unit, the foreign matter remover, and the purifier.
In the adsorption step, Fe (III) -substituted activated carbon is introduced into the adsorption tower, and heavy metal is adsorbed on the activated carbon.
Therefore, according to the embodiment of the present invention, as described above, the arsenic concentration of the contaminated soil is measured to have an effect suitable for cleaning and cleaning the contaminated soil having an arsenic concentration of about 25 to 75 mg / kg.
According to one embodiment of the present invention, it is possible to select a soil having a large amount of microalgae and a neutral soil having a large amount of sand, and by finely separating the range of the particle diameter with a high degree of contamination in the selected soil, So that it is possible to intensively purify only a heavy soil.
According to an embodiment of the present invention, the contaminated soil classified by the multi-stage particle size sorter having a particle size of about 0.075 to 4.75 mm is charged into the surface grinder to remove the heavy metal on the surface, Can be reduced, and the cleaning efficiency and the speed can be improved.
In addition, according to one embodiment of the present invention, sulfuric acid is applied as a leaching agent in consideration of the concentration of heavy metals such as arsenic and soot by the particle size of the contaminated soil to perform the washing and purifying process, thereby maximizing the acid dissolution efficiency .
Sulfuric acid was used as an eluent for the washing process water separated and discharged from the filter press, and caustic soda (NaOH) was applied as a neutralizing agent in consideration of the concentration of arsenic contained in the washing process water, and Fe ) Modified activated carbon, it is possible to neutralize the washing process water containing sulfuric acid efficiently, and efficiently adsorb the arsenic contained in the washing process water, thereby conveying the used washing process water amount, .
Although the present invention has been described in connection with the above-mentioned preferred embodiments, those skilled in the art will readily appreciate that various other modifications and variations can be made without departing from the spirit and scope of the present invention.
BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a block diagram illustrating a process of a contaminated soil remediation system for purifying contaminant soils having an arsenic concentration within a specific range according to an embodiment of the present invention.
FIG. 2 is a perspective view of a belt feeder, which is a constitution of a contaminated soil purification system according to an embodiment of the present invention;
FIG. 3A is a partial perspective view of a particle size reduction apparatus, which is a constitution of a contaminated soil purification system according to an embodiment of the present invention;
FIG. 3b is a cross-sectional view of a particle size-increasing apparatus, which is a constitution of a contaminated soil purification system according to an embodiment of the present invention,
FIG. 4 is a perspective view of a foreign matter remover, which is a constitution of a contaminated soil remediation system according to an embodiment of the present invention,
FIG. 5 is a perspective view of a multi-stage particle size sorter as one embodiment of a contaminated soil purification system according to an embodiment of the present invention. FIG.
FIG. 6A is a partial perspective view of a surface grinder, which is an example of a contaminated soil purification system according to an embodiment of the present invention;
FIG. 6B is a state diagram showing a state in which arsenic contaminants are separated from the surface of soil particles by a surface grinder, which is a constitution of a contaminated soil purification system according to an embodiment of the present invention. FIG.
FIG. 7 is a perspective view of a sedimentation concentrator, which is a constitution of a contaminated soil purification system according to an embodiment of the present invention;
FIG. 8 is a partial perspective view of an acid tundish as an example of a contaminated soil purification system according to an embodiment of the present invention;
FIG. 9 is a graph showing an input amount of an eluent and an arsenic concentration graph for each case using sulfuric acid and phosphoric acid according to an embodiment of the present invention,
FIG. 10 is a view showing a state in which the washing process water is circulated through a neutralization tank, a pressurized floating tank, an adsorption tower, and a washing water storage tank according to an embodiment of the present invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the detailed description of known functions and configurations incorporated herein will be omitted when it may unnecessarily obscure the subject matter of the present invention.
The same reference numerals are used for portions having similar functions and functions throughout the drawings. Throughout the specification, when a part is connected to another part, it includes not only a case where it is directly connected but also a case where the other part is indirectly connected with another part in between. In addition, the inclusion of an element does not exclude other elements, but may include other elements, unless specifically stated otherwise.
Hereinafter, the structure and function of the heavy metal contaminated
The heavy metal contaminated
As shown in FIG. 1, it can be seen that the contaminated
2 shows a perspective view of a
The contaminated
As shown in FIGS. 3A and 3B, the soil mass of the contaminated
The contaminated
Such a fixed particle size is 4 to 5 mm, preferably 4.75 mm in the specific embodiment of the present invention. The cleaning process water to be introduced into the
As shown in FIG. 1, the contaminated
5, the multi-stage
The first specific particle diameter is 0.07 to 0.08 mm, preferably 0.075 mm, and the second specific particle diameter is 0.015 to 0.025 mm, preferably 0.02 mm. That is, the contaminated
First, the contaminated
As shown in FIG. 1, the contaminated
At this time, the contaminated
On the other hand, the contaminated
As shown in FIG. 1, the contaminated
The contaminated
In an embodiment of the present invention, the first and second and third stages of
The purified
On the other hand, the contaminated
The purified
As shown in FIG. 10, it can be seen that in the
The washing process water injected into the pressurized floating tank (62) floats fine soil contained in the washing process water by air bubbles, thereby separating and discharging the floating fine soil. The washed and contaminated water in which the fine soil is discarded in the pressurized floating
In the
The washed and contaminated water from which the heavy metal such as arsenic is removed from the
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art. It is to be understood that such modified embodiments are within the scope of protection of the present invention as defined by the appended claims.
1: Heavy metal contaminated soil purification system
2: Contaminated soil
3: purified soil
4: Waste
10: Belt feeder
11: Drum Washer
12: Minimization device
20: Foreign body remover
30: Multi-stage particle size selector
31
41: Surface grinder
42: Hydrocyclone
43: particle size selector
44: Scum precipitation concentrating tank
45: Scum filter press
51: coagulating sedimentation tank
52: Enrichment tank
53: Mounting
54: Precipitation thickener
60: filter press
61: neutralization tank
62: Pressurized floating tank
63: Adsorption tower
64: Process water reservoir
65: Washing water storage tank
Claims (19)
A pretreatment unit for mixing and dispersing the contaminated soil having an arsenic concentration within a specific range with water;
A foreign matter remover installed in the pretreatment unit to remove foreign substances from the contaminated soil introduced into the polluted soil, to separate the polluted soil into particles of a predetermined size or more from the polluted soil, and to sort the polluted soil below the predetermined particle diameter;
At least one multi-stage particle size sorter installed in the foreign material remover so that the polluted soil having a selected particle size smaller than a predetermined particle size flows into the soil and divided into particle sizes;
A purifier installed to be cleaned by the washing process water when the contaminated soil that is classified into the less than the first specific particle diameter is introduced into the multi-stage particle size sorter;
A filtering device composed of a vacuum belt filter for separating and discharging the purified soil washed and influxed in the purification device and the washing process water contained in the purified soil;
And a neutralization tank for neutralizing the washing process water discharged from the purification device and the filtering device.
A surface grinder for introducing contaminating soil having a particle diameter equal to or larger than the first specific particle diameter by the multi-stage particle size separator to crush the surface;
A hydrocyclone for classifying the particle size of the contaminated soil surface-ground by the surface grinder; And
And a particle size sorter for discharging the purified soil by washing the contaminated soil having the particle size classified by the hydrocyclone having the first specific particle diameter or more by the washing process water,
Wherein the contaminated soil classified by the hydrocyclone to be less than the first specific particle diameter is treated as waste through a scum sedimentation concentration tank and a scum filter press.
A coagulating sedimentation tank through which the polluted soil having a particle size smaller than the first specific particle diameter is introduced by the multi-stage particle size separator and coagulated and precipitated by the polymer flocculant;
A concentrated tank in which the contaminated soil discharged from the coagulating sedimentation tank flows in and is concentrated;
Wherein the concentrated soil is introduced into the concentrated tank, and the acid soil is extracted from the contaminated soil by the sulfuric acid introduced from the sulfuric acid storage tank,
Wherein the purified soot purified and discharged from the acid tuyeres is introduced into the filter press so that the wash water is dehydrated and discharged.
Further comprising a sedimentation concentration tank provided between the acid tidal bath and the filter press for concentrating the purified soil discharged from the acid tanks and containing the polymer flocculant.
Wherein the specific range is 20 to 80 mg / kg, the predetermined particle diameter is 4 to 5 mm, and the first specific particle diameter is 0.07 to 0.08 mm.
The contaminated soil, which is disposed between the multi-stage particle size separator and the flocculation and sedimentation tank, is classified by the multi-stage particle size separator into smaller than the second specific particle diameter smaller than the first specific particle diameter. Further comprising: a flood control tank for injecting the contaminated soil into the coagulating sedimentation tank.
Wherein the second specific particle diameter is 0.015 to 0.025 mm.
A pretreatment unit for mixing and dispersing the contaminated soil having an arsenic concentration within a specific range with water;
A foreign matter remover installed in the pretreatment unit to remove foreign substances from the contaminated soil introduced into the polluted soil, to separate the polluted soil into particles of a predetermined size or more from the polluted soil, and to sort the polluted soil below the predetermined particle diameter;
At least one multi-stage particle size sorter installed in the foreign material remover so that the polluted soil having a selected particle size smaller than a predetermined particle size flows into the soil and divided into particle sizes;
A purifier installed to be cleaned by the washing process water when the contaminated soil that is classified into the less than the first specific particle diameter is introduced into the multi-stage particle size sorter;
A filtering device composed of a vacuum belt filter for separating and discharging the purified soil washed and influxed in the purification device and the washing process water contained in the purified soil;
A neutralization tank for introducing the washing process water discharged from the purifier and the filtering device to neutralize the washing process water;
A pressurized floatation tank in which the neutralized washing process water flows in the neutralization tank to float the micro-soil to separate the micro-soil so that the washing process water is discharged; And
And an adsorption tower for adsorbing a heavy metal contained in the washing process water flowing in the washing process water discharged from the pressurized floating tank,
Wherein the cleaning process water discharged from the adsorption tower is introduced into at least one of the pretreatment unit, the foreign matter remover, and the purification unit.
And a washing water storage tank for storing washing water discharged from the adsorption tower,
Wherein the washing water stored in the wash water reservoir is introduced into the pretreatment unit, the foreign matter remover, and the purifier.
Wherein the neutralization tank is charged with a neutralizing agent such as caustic soda.
Wherein the adsorption tower is charged with Fe (III) -substituted activated carbon, and heavy metals are adsorbed on the activated carbon.
Measuring the concentration of arsenic in the contaminated soil in the measuring unit, and injecting the contaminated soil having a specific arsenic concentration into the pretreatment unit;
Mixing and dispersing the inflowing contaminated soil and water in the pretreatment unit;
Filtering the contaminated soil introduced from the pretreatment unit with a predetermined particle diameter through a foreign material removing unit;
Wherein the contaminated soil selected by the foreign material removing unit is less than the predetermined particle size and is classified into particle sizes by the multi-stage particle sizer;
The contaminated soil classified by the particle size separator to a first specific particle size or more is charged into a surface grinder and surface-grounded, and the contaminated soil classified below the first specific particle diameter is injected into a purification apparatus to be purified;
Separating and discharging the cleaning process water contained in the purified soil by injecting the purified soil that has been cleaned and inflowed into the purification apparatus into the filtering apparatus; And
And neutralizing the washing process water discharged from the purifying device and the filtering device into the neutralization tank,
The contaminated soil discharged from the surface grinder is classified by the hydrocyclone, and the contaminated soil having the particle diameters classified by the hydrocyclone having the first specific particle diameter is washed by the washing process water to discharge the purified soil , And the polluted soil classified below the first specific particle size is treated as waste through a scum precipitation thickener and a scum filter press.
Wherein the purifying step comprises:
The contaminated soil having a particle diameter less than the first specific particle diameter is injected into a flocculation and sedimentation tank and coagulated and precipitated by a polymer flocculant;
Concentrating the contaminated soil in the concentration tank;
The concentrated soil is charged into an acid tank, and the soil is purified by acid leaching with sulfuric acid; And
And a step of introducing the purified soil into the filter press. The method for purifying heavy metals contaminated soil according to claim 1,
Wherein the contaminated soil having a second specific particle diameter smaller than the first specific particle diameter is discharged into the coagulating sedimentation tank after the washing process water is separated and discharged from the multi- .
The neutralized washing process flows into the pressurized floating tank to float the micro-soil so as to separate the micro-soil so that the washing process water is discharged; And
Wherein the washing process water discharged from the pressurized floating tank flows into the adsorption tower to adsorb heavy metals contained in the washing process water,
Wherein the cleaning process water discharged from the adsorption tower is introduced into at least one of the pretreatment unit, the foreign matter remover, and the purification unit.
Wherein the neutralization tank is charged with a neutralizing agent such as caustic soda.
Wherein the specific range is 20 to 80 mg / kg, the predetermined particle diameter is 4 to 5 mm, the first specific particle diameter is 0.07 to 0.08 mm, and the second specific particle diameter is 0.015 to 0.025 mm. Lt; / RTI >
Storing washing process water discharged from the adsorption tower in a washing water storage tank; And
Further comprising the step of supplying the cleaning process water stored in the wash water reservoir to the pretreatment unit, the foreign matter remover, and the purification unit.
In the adsorption step,
Wherein the adsorption tower is charged with Fe (III) -substituted activated carbon to adsorb heavy metals to the activated carbon.
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| CN112457851A (en) * | 2020-11-13 | 2021-03-09 | 湖南有色金属研究院 | Heavy metal contaminated soil remediation material and preparation method and application thereof |
| CN112457851B (en) * | 2020-11-13 | 2021-07-27 | 湖南有色金属研究院有限责任公司 | Heavy metal contaminated soil remediation material and preparation method and application thereof |
| CN113522946A (en) * | 2021-06-03 | 2021-10-22 | 福建南方路面机械股份有限公司 | Novel soil improvement treatment system, process and application |
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