KR101375482B1 - System and method for remediation of highly concentrated soil by continuous sequential advanced??separation and heavy metals removal process - Google Patents

Abstract

The present invention relates to a system and method for purifying a high concentration of contaminated soil, which is combined with a phased continuous advanced sorting process and a pollution load-differential heavy metal removing process. In more particular, the present invention relates to a system combined with a phased continuous advanced sorting process and a pollution load-differential heavy metal removing process for purifying a high concentration of contaminated soil, which is characterized in comprising: a measuring part for measuring a pollution level to measure a heavy metal concentration of contaminated soil; a pre-treating part for disintegrating contaminated soil having a heavy metal concentration equal to or greater than a specific concentration by mixing the contaminated soil with water; a foreign substance remover, which removes a foreign substance from the contaminated soil introduced from the pre-treating part, and sorts the contaminated soil into particles having a predetermined diameter or greater, as purified soil, and contaminated soil smaller than the predetermined diameter; at least one multi-stage particle size sorter, which receives the contaminated soil smaller than the predetermined diameter, obtained through the sorting at the foreign substance remover, to subdivide the contaminated soil according to particle diameters; a purifying device receiving the contaminated soil subdivided at the multi-stage particle size sorter to wash the contaminated soil with washing process water according to particle diameters; a filtering device including a vacuum belt filter to receive purified soil obtained by washing the contaminated soil at the purifying device, separate washing process water from the purified soil, and discharge the purified soil and the washing process water; and a neutralizing tank receiving the washing process water discharged from the purifying device and the filtering device to neutralize the washing process water. [Reference numerals] (10) Belt feeder; (11) Drum washer; (12) Disintegrating device; (20) Foreign substance remover; (30) Multi-stage particle size sorter; (31) Overflow process tank; (41) Surface grinder; (42) Hydrocyclone; (43) Particle size sorter; (44) Scum precipitation & enrichment tank; (51) Aggregation & precipitation tank; (52) Concentration tank; (53) 1 to 3 step acid elution tank; (60) Filter press; (61) Neutralizing tank; (62) Pressure & float tank; (63) Fe(III) modified and activated adsorption tower; (64) Process water storage; (65) Washing water storage; (AA) Contaminated soil, contaminated soil & washing process water, and contaminated soil & compound; (BB) Washing process water; (CC) Compound (elution agent, polymer aggregate agent, and slacked lime); (DD) Foreign substance; (EE,GG) Scum; (FF) Polymer aggregate agent; (HH) Precipitation & enrichment tank (1); (II) Precipitation & enrichment tank (2); (JJ) Make-up water storage; (KK) Slacked lime storage tank; (LL) Phosphoric acid storage tank; (MM) Polymer aggregate agent; (NN) Filter press (scum); (OO) 1 to 3 step acid elution tank (pH adjustment); (PP) Lower tank of particle size sorter

Description

System and method for remediation of highly concentrated soil by continuous sequential advanced separation and heavy metals removal process}

The present invention relates to a high concentration contaminated soil purification system and method for combining continuous high-level screening and differential heavy metal removal process by pollution load. More specifically, the soil soils with heavy metal concentrations above a certain concentration are specifically targeted, and the soil concentrations above the soil pollution standards under the Soil Environment Act are specifically defined. More specifically, soils with a arsenic concentration of about 75 mg / kg or more By using a multi-stage particle size sorter, the particle size is subdivided and purified according to the degree of contamination, and in order to purify heavy metal contamination, an arsenic concentration tank using surface grinder, galvanic acid, or phosphoric acid as an eluent is provided more efficiently. It is about high concentration polluted soil purification system and purification method that combines continuous high-level screening and differential heavy metal removal process by pollution load which can clean polluted soils of more than 75mg / kg and recycle all the washing process water used. .

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. For these coarse earth, neutral earth and fine earth soils, the appropriate economic range is coarse earth according to cost and time efficiency, the inefficient economic range is fine earth, and the intermediate range is neutral earth.

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.

Korea Patent Publication No. 2003-0005713

The present invention was derived to solve the above problems, according to an embodiment of the present invention, by measuring the arsenic concentration of contaminated soil, heavy metal contaminated soil purification system and purification method suitable for washing and purifying arsenic of high concentration Will be provided.

According to one embodiment of the present invention, the soil is classified by the soil of large soils and soils with a large amount of fine earth, and by separating the range of particle size with high pollution in the selected soil very finely, the degree of contamination It will provide a high concentration contaminated soil purification system and a method for clarifying only heavily soiled soils.

In addition, according to one embodiment of the present invention, contaminated soil having a particle size of about 0.75 to 4.75 mm classified by the multi-stage particle size separator is introduced into a surface grinder to include a process of peeling heavy metals from the surface, thereby reducing waste disposal costs. It can provide high concentration polluted soil purification system and purification method which can reduce the cost and improve the purification efficiency and speed.

In addition, according to an embodiment of the present invention, in consideration of the concentration of heavy metals, such as by the particle size of the soil, arsenic, etc., by applying phosphoric acid as the eluent, or performing a washing, purifying process using a coin, acid dissolution efficiency It will provide a high concentration polluted soil purification system and purification method to maximize the efficiency and purification efficiency.

In addition, phosphoric acid was used as the eluent for the washing process water separated and discharged from the filter press, and considering the arsenic concentration contained in the washing process water, calcined lime (Ca (OH) ₂ ) was applied as a neutralizing agent, and the adsorption tower By applying Fe (III) -modified activated carbon, it is possible to efficiently neutralize the washing process water containing phosphoric acid, and to efficiently adsorb arsenic contained in the washing process water, thereby conveying and recycling all the used washing process water. Providing possible polluted soil purification systems and methods of purification.

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.

A first object of the present invention is a measurement unit for measuring the concentration of arsenic by measuring the pollution degree; A pretreatment unit for pulverizing by mixing water with contaminated soil having a arsenic concentration above a certain concentration; 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; Purifier installed to be washed by the washing process water by particle size when the contaminated soil is introduced into the multi-stage particle size separator; A filtering device composed of a vacuum belt filter for separating and discharging the purified soil introduced by washing in the purification apparatus and the washing process water contained in the purified soil; High concentration pollution combining stepwise continuous altitude selection and differential heavy metal removal process according to the pollution load, characterized in that it comprises a; neutralizing tank for neutralizing the washing process water by the washing process water discharged from the purifying device and the filtering device Can be achieved as a soil purification system.

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; Hydrocyclones for classifying particle diameters of the soil contaminated by surface grinders; And a particle size sorter, wherein the particle size classified by the hydrocyclone washes the contaminated soil of the first or more specific particle diameters by washing process water and discharges the purified soil, and the hydrocyclone classifies the particle size as less than the first specific particle size. The contaminated soil may be characterized in that it is treated as waste through the scum sedimentation concentrate tank and 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; Contaminated soil is concentrated in the concentration tank is introduced, the acid dissolution tank for acid eluting the contaminated soil by the phosphoric acid introduced from the phosphoric acid storage tank; including, the purified soil discharged from the acid dissolution tank flows into the filter press The washing water may be 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 concentration is 70 ~ 80mg / kg, the predetermined particle size is 4 ~ 5mm, the first specific particle size may be characterized in that 0.07 ~ 0.08mm.

The second object of the present invention is a measurement unit for measuring the concentration of arsenic by measuring the pollution degree; A pretreatment unit for pulverizing by mixing water with contaminated soil having a arsenic concentration above a certain concentration; A foreign material remover installed to remove foreign substances from the contaminated toy introduced from the pretreatment unit, to separate the first predetermined particle diameter or more from the contaminated soil into purified soil, and to select the contaminated soil of 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 purification device installed to be washed by the washing process water by particle diameter when the contaminated soil classified in the multi-stage particle size separator is introduced; 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 neutralizing the washing process water by introducing the washing process water discharged from the purifying device and the filtering device; Pressurized flotation tank for neutralizing the washing process water inflow from the neutralization tank to support the fine soil to separate the suspended fine soil to discharge the washing process water; And an adsorption tower into which the washing process water discharged from the pressurization tank is introduced to adsorb heavy metals contained in the washing process water. The washing process water discharged from the adsorption tower includes the pretreatment unit, the foreign material remover, and the purifying device. It can be achieved as a high concentration contaminated soil purification system that combines the step-by-step continuous altitude screening and differential load heavy metal removal process characterized in that the input to at least one of the.

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.

The neutralizing tank may be characterized in that the neutralizing agent, which is hydrated lime.

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 a method for purifying contaminated soil, comprising: measuring a concentration of arsenic of contaminated soil in a measuring unit and introducing contaminated soil having a arsenic concentration above a specific concentration into a 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 by introducing the washing process water discharged from the purifying device and the filtering device, wherein the contaminated soil discharged from the surface crusher is classified by particle size by hydrocyclone, and The particle diameter classified by hydrocyclone washes the contaminated soil of the first specific particle size or more by washing process water to discharge the purified soil, and the contaminated soil classified as less than the first specific particle diameter is the scum sedimentation concentration tank and the scum filter press. It can be achieved as a high concentration contaminated soil purification method that combines the step-by-step continuous high-level screening and the differential heavy metal removal process by pollution load characterized in that it is treated as waste via.

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 introduced into an acid dissolution tank, and the soil is acid eluted and purified by phosphoric acid; And a step of introducing the purified soil into the filter press by being concentrated into the precipitation concentration tank and precipitated by the polymer flocculant, wherein the contaminated soil having less than the second specific particle diameter smaller than the first specific particle diameter is the overflow process tank in the multi-stage particle size separator. After the washing process water is separated and discharged through the conveying, it may be characterized in that it is introduced into the flocculation settling 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.

A fourth object of the present invention is a measurement unit for measuring the concentration of arsenic by measuring the pollution degree; A pretreatment unit for pulverizing by mixing water with contaminated soil having a arsenic concentration above a certain concentration; 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 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; An electrokinetic device for purifying the contaminated soil by introducing contaminated soil having a particle diameter classified by the hydrocyclone or more than the first specific particle diameter; A purifier installed to be washed by the washing process water for each particle diameter when contaminated soil classified as less than the first specific particle size is introduced from the multi-stage particle size separator; 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 by flowing the washing process water discharged from the purifying device and the filtering device, wherein the contaminated soil classified as less than the first specific particle size by the hydrocyclone is scum precipitated. It can be achieved as a highly contaminated soil purification system combining the continuous heavy screening step by step and the differential heavy metal removal process by pollution load, characterized in that it is treated as waste through a thickening tank and scum filter press.

And a sediment concentrating tank for introducing the contaminated soil classified into less than a second specific particle diameter smaller than the first specific particle size by the multi-stage particle size sorter to precipitate and concentrate the contaminated soil with a polymer coagulant. The precipitated concentrated soil may be separated and discharged from the washing process water in the filter press, and treated as waste.

An agglomeration sedimentation tank in which the contaminated soil classified by the multi-stage particle size separator less than the first specific particle diameter is introduced into or discharged by agglomeration and precipitation by a polymer flocculant; A concentration tank into which the contaminated soil discharged from the flocculation sedimentation tank is introduced and concentrated; Contaminated soil concentrated in the concentration tank is introduced, the precipitation condensation tank for sedimenting and condensing the contaminated soil; and the purified soil discharged from the sedimentation condensate is introduced into the filter press and the washing process water is dewatered and discharged, the pollution Sat may be characterized in that the purifier is put into the galvanic.

The electrokinetic device is provided in an input tank into which the contaminated soil is input, a plurality of electrode rods provided in the contaminated soil input to the input tank, and a power is applied by a power supply device, an electrolyte supply device supplying electrolyte to the input tank, and the electrode bar. It may be characterized in that it comprises a contaminant extraction pipe for extracting and discharging the contaminant containing arsenic moved to.

A fifth object of the present invention is a method for purifying contaminated soil, comprising: measuring a concentration of arsenic of contaminated soil in a measuring unit and introducing contaminated soil having a arsenic concentration above a specific concentration into a 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 by introducing the washing process water discharged from the purifying device and the filtering device, wherein the contaminated soil discharged from the surface crusher is classified by particle size by hydrocyclone, and Particle diameters classified by hydrocyclones purify contaminated soil of the first specific particle diameter or more by electrokinetic discharge and purify the soil, and the contaminated soil classified under the first specific particle size may be used for scum sedimentation concentrates and scum filter presses. It can be achieved as a high concentration contaminated soil purification method that combines the step-by-step continuous high-level screening and the differential heavy metal removal process by pollution load characterized in that it is treated as waste.

In the purifying step, the contaminated soil classified into less than the second specific particle diameter smaller than the first specific particle size is introduced into the precipitation concentration tank by the multi-stage particle size separator, and the contaminated soil is precipitated and concentrated by the polymer coagulant, and the precipitation The contaminated soil settled and concentrated by the concentration tank separates and discharges the washing process water from the filter press, is treated as waste, and the contaminated soil classified by the multi-stage particle size sorter to be less than the first specific particle size and more than the second specific particle size. Is introduced into the coagulation sedimentation tank and coagulated and precipitated by the polymer coagulant, and the contaminated soil discharged from the coagulation sedimentation tank is introduced into and concentrated in the concentration tank, and the precipitation soil in the precipitation concentration tank is discharged. The filter press is introduced into the filter press, and the washing process water is dehydrated and discharged. That may be characterized.

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.

Therefore, as described, according to the embodiment of the present invention, the arsenic concentration of the contaminated soil is measured to have an effect suitable for washing and purifying arsenic of high concentration.

According to one embodiment of the present invention, the soil is classified by the soil of large soils and soils with a large amount of fine earth, and by separating the range of particle size with high pollution in the selected soil very finely, the degree of contamination Has the effect of intensively purifying only heavy soils.

In addition, according to one embodiment of the present invention, contaminated soil having a particle size of about 0.75 to 4.75 mm classified by the multi-stage particle size separator is introduced into a surface grinder to include a process of peeling heavy metals from the surface, thereby reducing waste disposal costs. It can reduce the efficiency, and has the effect of improving the purification efficiency and speed.

In addition, according to an embodiment of the present invention, in consideration of the concentration of heavy metals, such as by the particle size of the soil, arsenic, etc., by applying phosphoric acid as the eluent, or performing a washing, purifying process using a coin, acid dissolution efficiency And has the effect of maximizing the purification efficiency.

In addition, phosphoric acid was used as the eluent for the washing process water separated and discharged from the filter press, and considering the arsenic concentration contained in the washing process water, calcined lime (Ca (OH) ₂ ) was applied as a neutralizing agent, and the adsorption tower By applying Fe (III) -modified activated carbon, it is possible to efficiently neutralize the washing process water containing phosphoric acid, and to efficiently adsorb arsenic contained in the washing process water, thereby conveying and recycling all the used washing process water. Has the possible effect.

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.

1 is a block diagram showing a process of a contaminated soil purification system for purifying contaminated soil having a arsenic concentration above a certain concentration according to the first embodiment of the present invention;
2 is a perspective view of a belt feeder which is one component of the contaminated soil purification system according to the first embodiment of the present invention;
Figure 3a is a partial perspective view of the powder separation apparatus which is one component of the contaminated soil purification system according to the first embodiment of the present invention,
3B is a cross-sectional view of a powder separation apparatus that is one component of the contaminated soil purification system according to the first embodiment of the present invention;
4 is a perspective view of a foreign material remover as one component of the contaminated soil purification system according to the first embodiment of the present invention;
5 is a perspective view of a multi-stage granularity sorter which is one component of the contaminated soil purification system according to the first embodiment of the present invention;
FIG. 6A is a partial perspective view of a surface crusher which is one component of the contaminated soil purification system according to the first embodiment of the present invention; FIG.
6b is a state diagram showing a state in which arsenic pollutants are separated from the surface of soil particles by a surface grinder which is one component of the contaminated soil purification system according to the first embodiment of the present invention;
7 is a perspective view of a sedimentation concentration tank that is one component of the contaminated soil purification system according to the first embodiment of the present invention;
8 is a partial perspective view of an acid discharging tank which is one component of the contaminated soil purification system according to the first embodiment of the present invention;
9 is a graph showing the eluent dose and arsenic concentration for each case using sulfuric acid and phosphoric acid according to the first embodiment of the present invention,
10 is a block diagram showing a state in which the washing process water is circulated through a neutralization tank, a pressure flotation tank, an adsorption tower, and a washing water storage tank according to the first embodiment of the present invention;
11 is a block diagram showing a process of a contaminated soil purification system for purifying contaminated soil having a arsenic concentration above a certain concentration according to a second embodiment of the present invention;
12 is a perspective view of an electrokinetic device which is one component of the contaminated soil purification system according to the second embodiment of the present invention;
Figure 13 shows a plan view of an electrokinetic device which is one component of the contaminated soil purification system according to the second 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 constitution, function and heavy metal contaminated soil purification system (1) of the high concentration contaminated soil purification system (1) combining the continuous heavy screening step by step according to the first embodiment of the present invention and the differential heavy metal removal process according to pollution load The purification method used will be described. First, FIG. 1 shows a block diagram showing a process of a contaminated soil purification system 1 for purifying contaminated soil 2 having a arsenic concentration above a certain concentration according to the first embodiment of the present invention.

The heavy metal contaminated soil purification system 1 according to the first embodiment of the present invention first measures the heavy metal concentration of the contaminated soil 2 by a measuring unit, and targets the contaminated soil 2 having a heavy metal concentration above a certain concentration. Thus, the contaminated soil (2) has a configuration for cleaning, cleaning, classifying by particle size. Specifically, the specific concentration or higher means more than soil pollution control standards under the Soil Environment Act. More specifically, the arsenic concentration is about 70 to 80 mg / kg, and preferably 75 mg / kg.

As shown in FIG. 1, it can be seen that the contaminated soil 2 having a arsenic concentration of the contaminated soil 2 measured at 75 mg / kg or more is introduced into the pretreatment unit. As shown in FIG. 1, it can be seen that the pretreatment unit according to the first embodiment of the present invention may include a belt feeder 10, a drum washer 11, and a powder separating apparatus 12.

2 shows a perspective view of a belt feeder 10 which is one component of the contaminated soil purification system 1 according to the first embodiment of the present invention. 1, the contaminated soil 2 is introduced into the drum washer 11 through the belt feeder 10. In the drum washer 11, water and the contaminated soil 2 are mixed in the drum, and the lumps of the contaminated soil 2 are released. Further, the introduced water is separated from the filter press 60 as described later, and is configured so that the neutralized, adsorbed washing process water is returned and input.

The contaminated soil 2 that has passed through the drum washer 11 is introduced into the atomization apparatus 12 so that the soil mass of the contaminated soil 2 is further reduced into smaller particles to be individually granulated. FIG. 3A shows a partial perspective view of the powder separating apparatus 12 which is one component of the contaminated soil purification system 1 according to the first embodiment of the present invention. 3B shows a cross-sectional view of the powder separation apparatus 12 that is one component of the contaminated soil purification system 1 according to the first embodiment of the present invention.

As shown in Figure 3a and Figure 3b, it can be seen that by the road scrubber provided in the powder separation apparatus 12 according to the first embodiment of the present invention, the soil mass of the contaminated soil 2 is small powdered. . In addition, the powder separation apparatus 12 according to the first embodiment of the present invention can minimize the amount of water and can control the crushing strength and the residence time of the contaminated soil 2 by adjusting the rotational speed. In addition, as will be described later, the number of cleaning processes to be supplied to the fractionation device 12 is returned to the cleaning process water separated by the flocculation and sedimentation tank 51.

The contaminated soil 2 having passed through the particle size fractionator 12 is introduced into the foreign matter remover 20 as shown in FIG. 4 is a perspective view of the foreign matter remover 20 that is one component of the contaminated soil purification system 1 according to the first embodiment of the present invention. As shown in FIG. 4, the foreign matter remover 20 according to the first embodiment of the present invention may be configured as a wet screen, and the foreign matter is removed by the foreign matter remover 20, and contaminated soil is removed. In (2), the contaminated soil 2 having a predetermined particle diameter or more is separated into the purified soil 3 and discharged, and the contaminated soil 2 having a predetermined particle diameter is introduced into the multi-stage granularity separator 30.

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 foreign material remover 20 is also separated from the filter press 60 as described later, and the neutralized and adsorbed cleaning process water is transported and supplied.

As shown in FIG. 1, the contaminated soil 2 classified into less than 4.75 mm by the foreign material remover 20 is introduced into the multi-stage particle size separator 30. 5 shows a perspective view of a multi-stage granularity sorter 30, which is one component of the contaminated soil purification system 1 according to the first embodiment of the present invention.

As shown in FIG. 5, the multi-stage particle size separator 30 according to the first embodiment of the present invention is a multi-precision particle size sorting device, which is composed of a multi-hydrocyclone 42 to subdivide contaminated soil 2 by particle size. It can be seen that. In a specific embodiment of the present invention, the first soil of less than the first specific particle diameter and the second soil of less than the second specific particle diameter less than the first specific particle soil (2), and the second soil of less than the first specific particle diameter There will be three subdivisions on Saturday (2).

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 soil 2 having a particle size of 0.075 to 4.75 mm, the contaminated soil 2 having a particle size of 0.02 to 0.075 mm, and 0.02 mm by the multi-stage particle size separator 30 according to the first embodiment of the present invention. It is subdivided into contaminated soil 2 having a particle size of less than.

First, the contaminated soil 2 having a particle size of 0.075 to 4.75 mm is introduced into the surface grinder 41 as shown in FIG. Fig. 6A shows a partial perspective view of the surface grinder 41, which is one component of the contaminated soil purification system 1 according to the first embodiment of the present invention. 6B is a state diagram showing a state in which arsenic pollutants are separated from the soil particle surface by the surface crusher 41 which is one component of the contaminated soil purification system 1 according to the first embodiment of the present invention. . The surface grinder 41 according to the first embodiment of the present invention improves the purification efficiency and speed by removing the contaminants of the coarse particles from the contaminated soil 2 using a ball mill.

As shown in FIG. 1, the contaminated soil 2 from which contaminants have been separated by the surface crusher 41 is introduced into the hydrocyclone 42 to separate the contaminated soil 2 by particle size have. That is, the contaminated soil 2 having a particle size of less than 0.07 mm and the contaminated soil 2 having a particle size of 0.07 or more, more specifically 0.07 to 4.75 mm are separated by the hydrocyclone 42.

At this time, the contaminated soil 2 having a particle size within the range of 0.07 to 4.75 mm is introduced into the particle size separator 43, washed by the washing process water, and then discharged from the purified soil 3. Also, as shown in FIG. 1, it can be seen that the number of washing processes stored in the process water storage tank 64 is transferred and loaded as shown in FIG.

On the other hand, the contaminated soil 2 having a particle size of less than 0.07 mm is introduced into the scum precipitation thickening tank 44 and is agglomerated by the polymer flocculant, and then discharged through the scum filter press 45 to the waste 4, .

As shown in FIG. 1, the contaminated soil 2 having a particle size of 0.075 to 4.75 mm classified by the multi-stage particle size separator 30 is introduced into the flocculation and sedimentation tank 51. 7 shows a perspective view of a sedimentation concentration tank 54 which is one component of the contaminated soil purification system 1 according to the first embodiment of the present invention. In the coagulating sedimentation tank 51, coagulation and sedimentation are generated by the polymer flocculant, and the washing process water is separated and returned to the surface grinder 41 and the fractionation device 12 as described above. The contaminated soil 2 coagulated and precipitated in the flocculation and sedimentation tank 51 is introduced into the concentration tank 52 and can be subjected to the concentration process once again. Before being introduced into the concentration tank 52, The method may further comprise the step of: The separated scum is introduced into the neutralization tank 61, as will be described later.

The contaminated soil 2 concentrated in the concentration tank 52 is introduced into the acid rain tank 53 as shown in FIG. Phosphoric acid is introduced into the acid dissolution tank 53 according to the first embodiment of the present invention as an eluent. 8 shows a partial perspective view of an acid discharging tank 53 which is one component of the contaminated soil purification system 1 according to the first embodiment of the present invention. In addition, Figure 9 shows the eluent dose and arsenic concentration graph for each case using sulfuric acid and phosphoric acid according to the first embodiment of the present invention.

In the first embodiment of the present invention is composed of 1,2,3 steps of acid dissolution tank 53 to purify the contaminated soil (2) by acid dissolution, phosphoric acid stored in the phosphoric acid storage tank as an eluent 53 Will be added. As shown in Figure 9, in the case of contaminated soil (2) having a arsenic concentration of more than 75 mg / kg, it can be seen that it is effective to apply phosphoric acid as the eluent. That is, when the arsenic concentration is more than 75mg / kg, even if only about 0.2N of phosphoric acid as an eluent, the arsenic concentration is reduced to 25mg / kg or less.

The purified soil 3 which has been purified due to the decrease in the concentration of arsenic in the acid precipitation 53 is introduced into the precipitation thickening tank 54 and again precipitated and concentrated. Further, it may further include removing the scum before it is introduced into the precipitation concentrating tank 54. [

On the other hand, the contaminated soil 2 classified into the particle size of less than 0.02 mm in the multi-stage particle sizer 30 is similar to the above-mentioned process of the contaminated soil 2 having the particle size of 0.02 to 0.075 mm, As shown in FIG. 3, it can be seen that the molten metal is subjected to the molten metal preform 31 before being injected into the coagulating sedimentation furnace. The contaminated soil 2 classified to a particle size of less than 0.02 mm is discharged into the flocculation and sedimentation tank 51 after the washing process water is separated in the tundra 31. The separated cleaning process water is transported to the multi-stage particle sizer (30).

The purified soil 3 precipitated and concentrated in the precipitation thickening tank 54 is discharged from the filter press 60 composed of a vacuum belt filter after separating and discharging the washing process water. The septic process water separated and discharged from the filter press (60) is introduced into the neutralization tank (61). FIG. 10 is a block diagram showing a state in which the washing process water is circulated through the neutralization tank 61, the pressure flotation tank 62, the adsorption tower 63, and the wash water storage tank 65 according to the first embodiment of the present invention. will be.

As shown in FIG. 10, it can be seen that in the neutralization tank 61, the cleaning process water having an acidity is inputted, and the cleaning process water is neutralized by the neutralizing agent. The neutralizer introduced into the neutralization tank 61 according to the first embodiment of the present invention is configured to be hydrated. The slaked lime stored in the slaked lime storage tank is introduced into the neutralization tank 61 as a neutralizing agent to neutralize the contaminated soil 2, and then checks the pH, and is introduced into the pressurized flotation tank 62 as shown in FIG. .

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 tank 62 flows into the adsorption tower 63 as shown in FIG. On the other hand, as shown in FIG. 1, the separated fine soil is put into the scum sedimentation concentration tank 44, agglomerated by the polymer flocculant, and then treated with the waste 4 through the scum filter press 45.

In the adsorption tower 63, heavy metals such as arsenic contained in the washing process water are adsorbed and fixed by activated carbon. Activated carbon provided in the adsorption tower 63 according to the first embodiment of the present invention corresponds to activated carbon (Fe (III) modified activated carbon) coated with trivalent iron. Such Fe (III) modified activated carbon has a characteristic of high adsorption efficiency of arsenic which is specialized for arsenic treatment.

The washed and contaminated water from which the heavy metal such as arsenic is removed from the adsorption tower 63 is stored in the process water storage tank 64 and the wash water storage tank 65 after confirming the arsenic concentration so that the entire amount is recycled. That is, as shown in FIG. 1, the washing process water from which the heavy metal is removed is put into the drum washer 11, the foreign matter remover 20, the particle size separator 43, and the acid bath 53 for reuse.

Hereinafter, the constitution and function of the contaminated soil purification system 1 for purifying the contaminated soil 2 having a arsenic concentration higher than a specific concentration according to the second embodiment of the present invention, and the purification method using the purification system 1 To explain.

FIG. 11 is a block diagram showing a process of the contaminated soil purification system 1 for purifying contaminated soil 2 having a arsenic concentration equal to or more than a specific concentration according to the second embodiment of the present invention. Belt feeder 10, a drum washer 11, a powder separating apparatus 12, a foreign substance remover 20, multi-stage granularity which constitutes a heavy metal contaminated soil purification system 1 according to a second embodiment of the present invention Separator 30, surface grinder 41, hydrocyclone 42, particle size separator 43, overflow process tank 31, coagulation sedimentation tank 51, concentration tank 52, sediment concentration tank 54, filter press 60, the neutralization tank 61, the pressure flotation tank 62, the scum sedimentation concentration tank 44, the scum filter press 45, the adsorption tower 63, the process water storage tank 64 is the first embodiment mentioned above It may be configured in the same manner as the configuration of the heavy metal contamination soil purification system (1) according to.

However, in comparison with the first embodiment, the second embodiment also includes a contaminated soil 2 having an arsenic concentration of 75 mg / kg or more, but does not include an acid discharging tank 53 and is provided by the electrokinetic machine 70. To clean up the contaminated soil (2), there are differences in specific processes. Therefore, the second embodiment will be described based on the specific process flow and the configuration of the electrokinetic machine 70.

As shown in FIG. 11, in the contaminated soil purification system 1 according to the second embodiment of the present invention, the contaminated soil 2 having a arsenic concentration of 75 mg / kg or more is fed to the felt feeder 10 and the drum washer 11. And it is introduced into the foreign matter remover 20 through the separation device 12. The configuration and function of the felt feeder 10, the drum washer 11, the powder separating apparatus 12 and the foreign matter remover 20 is the same as in the above-mentioned first embodiment.

The foreign matter is removed by the foreign substance remover 20, and the contaminated soil 2 having a particle diameter of 4.75 mm or more is separated and discharged into the purified soil 3, and the contaminated soil 2 having a particle size of 4.75 mm or less has a multistage particle size. It is put into the sorter (30). By the multi-stage particle size separator 30, contaminated soil (2) having a particle size of less than 0.02 mm, contaminated soil (2) having a particle size of 0.02 to 0.075 mm, and contaminated soil (2) having a particle size of 0.075 to 4.75 mm Will be subdivided into

As shown in FIG. 11, the contaminated soil 2 having a particle size of 0.075 mm or more is introduced into the surface grinder 41 to separate the arsenic contaminants from the surface of the contaminated soil 2 particles, and to the hydrocyclone 42. The contaminated soil (2) having a particle size of less than 0.075 mm is treated as waste (4) via the scum sediment concentrating tank (44) and the scum filter press (45), and the contaminated soil (2) having a particle size of 0.075 mm or more is selected as a particle size selector ( After passing through 43, it is put into the electrokinetic machine 70 to be purified.

 On the other hand, by the multi-stage particle size sorter 30, classified as contaminated soil 2 having a particle size of 0.02 ~ 0.075mm, as shown in Figure 11, the flocculation sedimentation tank 51, the concentration tank 52, the first After passing through the precipitation concentration tank 54-1, the first filter press 60-1 is introduced to separate and discharge the washing process water.

In addition, it is classified as contaminated soil 2 having a particle size of less than 0.02 mm by the multi-stage particle size separator 30, as shown in FIG. 11, through the overflow process tank 31, and the second sedimentation concentration tank 54-2. ), Through the second filter press 60-2, the washing process water is separated and discharged, and then treated as waste 4.

As in the first embodiment, also in the second embodiment, the used washing process water is recycled in its entirety. That is, the washing process water separated and discharged from the first filter press 60-1 and the second filter press 60-2 is introduced into the neutralization tank 61 to be neutralized, and pressurized as shown in FIG. 11. The fine soil is introduced into the flotation tank 62, and the fine soil contained in the washing process water is separated, and then, the fine soil is introduced into the adsorption tower 63, and the arsenic metal is adsorbed with Fe (III) -modified activated carbon. This will remove heavy metals from the water.

After the heavy metal is removed, the washing process water is stored in the process water storage tank 64, and then returned to the drum washer 11, the powder separation device 12, the particle size separator 43, and the foreign matter remover 20 to be introduced.

12 shows a perspective view of an electrokinetic machine 70 which is one component of the contaminated soil purification system 1 according to the second embodiment of the present invention. 13 shows a plan view of an electrokinetic machine 70 which is one component of the contaminated soil purification system 1 according to the second embodiment of the present invention.

As mentioned above, the contaminated soil 2 introduced into the electrokinetic machine 70 has a particle size of 0.02-0.75 by the contaminated soil 2 and the multi-stage particle size separator 30 having a particle size of 0.075-4.75 mm after surface grinding. It is classified in mm, and corresponds to the contaminated soil 2 through the coagulation sedimentation tank 51, the concentration tank 52, the precipitation concentration tank 54, and the filter press 60.

As shown in FIG. 12 and FIG. 13, the electrokinetic machine 70 is provided in an input tank 71 into which the contaminated soil 2 is input, and in the contaminated soil 2 input to the input tank 71, and a power supply device ( 73 extracts and discharges contaminants containing arsenic moved to the electrode 72, the electrolyte supply device 74 for supplying the electrolyte to the input tank 71 and the electrode 62 is supplied with power. It can be seen that it can be configured to include a contaminant extraction pipe.

As shown in FIG. 13, it can be seen that the contaminated soil 2 is loaded into the input tank 71, and the plurality of electrode rods 62 are vertically positioned into the contaminated soil 2. In addition, the plurality of electrode rods are composed of a plurality of positive electrode rods 62-1 having a positive polarity by a power supply device and a plurality of negative electrode rods 62-2 having a negative polarity. The electrolyte is introduced by the electrolyte supply device 74.

Therefore, when the electrolyte is introduced and electricity is supplied to the electrode 62, the contaminants containing arsenic in the soil 2 are collected near the electrode 62, and the contaminant extraction tube provided on the electrode 62 side is removed. The contaminants containing such arsenic are extracted and discharged through, thereby purifying by removing arsenic in the contaminated soil (2).

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: High Contamination 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
54-1: 1st precipitation concentrate
54-2: the second sedimentation concentration tank
60: filter press
60-1: First filter press
60-2: 2nd filter press
61: neutralization tank
62: Pressurized floating tank
63: Adsorption tower
64: Process water reservoir
65: Washing water storage tank
70: copper
71: Injection tank
72: electrode
72-1: positive electrode
72-2: negative electrode
73: power supply
74: electrolyte supply device

Claims (22)

Measuring unit for measuring the pollution degree to measure the concentration of heavy metals in the soil;
A pretreatment unit for mixing and dispersing the contaminated soil having a heavy metal concentration above a certain concentration with water;
A foreign material remover installed to remove foreign substances of the contaminated soil introduced from the pretreatment unit, to separate a predetermined particle diameter or more from the contaminated soil, and to select the contaminated 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 purification device installed to be washed by the washing process water by particle diameter when the contaminated soil classified in the multi-stage particle size separator is introduced;
A filtering device for separating and purifying the purified soil introduced by washing in the purification apparatus 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 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;
A particle size sorter configured to discharge the purified soil by washing the contaminated soil having a particle size classified by the hydrocyclone with the washing process water of the first specific particle diameter or more;
An agglomeration sedimentation tank discharged from the contaminated soil having a particle size less than the first specific particle size by the multi-stage particle size separator to be agglomerated and precipitated by a polymer flocculant;
A concentrated tank in which the contaminated soil discharged from the coagulating sedimentation tank flows in and is concentrated; And
And an acid dissolution tank in which the contaminated soil concentrated in the concentrating tank is introduced to dissolve the contaminated soil by phosphoric acid introduced from a phosphoric acid storage tank.
The contaminated soil classified as less than the first specific particle size by the hydrocyclone is treated as waste through a scum sedimentation concentration tank and a scum filter press,
The purified soil discharged from the acid discharging tank is introduced into the scum filter press, and the washing water is dehydrated and discharged.
delete delete The method of claim 1,
It is provided between the acid dissolution tank and the scum filter press, a step-by-step continuous altitude screening and pollution load differential type characterized in that it further comprises a sedimentation concentration tank for depositing and condensing the purified soil discharged from the acid dissolution tank is introduced into the polymer flocculant Polluted soil purification system.
The method of claim 1,
The specific concentration is arsenic concentration 70 ~ 80mg / kg, the constant particle size is 4 ~ 5mm, the first specific particle size is characterized in that the step-by-step continuous altitude screening and contamination load differential pollution soils, characterized in that 0.07 ~ 0.08mm Purification system.
The method of claim 1,
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
Further comprising a; adsorption tower for adsorbing the heavy metal contained in the washing process water is introduced into the washing process water discharged from the pressure flotation tank,
Differential pollution soil purification system according to the step-by-step continuous altitude screening and pollution load, characterized in that the washing process water discharged from the adsorption tower is introduced into at least one of the pretreatment unit, the debris remover and the purification device.
The method according to claim 6,
And a washing water storage tank for storing washing water discharged from the adsorption tower,
Stepwise continuous altitude screening and pollution load differential cleaning system according to the step characterized in that the washing process water stored in the wash water reservoir is introduced into the pretreatment unit, the debris remover and the purification device.
The method according to claim 6,
The neutralization tank is a step-by-step continuous altitude selection and pollution load differential pollution soil purification system, characterized in that the neutralizing agent is a slaked lime.
The method according to claim 6,
In the adsorption column, Fe (III) modified activated carbon is introduced into the step by step continuous altitude screening and pollution load differential pollution soil purification system characterized in that the heavy metal is adsorbed on the activated carbon.
In the method of purifying polluted soil using the differential polluted soil purification system according to claim 1,
Measuring the heavy metal concentration of the contaminated soil in the measuring unit and introducing the contaminated soil having a heavy metal concentration above a certain 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 into the first specific particle size or more by the multi-stage particle size separator is introduced into a surface mill, and the surface is ground and the contaminated soil classified under the first specific particle diameter is introduced into a purification apparatus and 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 particle size by hydrocyclone, and the particle diameter classified by the hydrocyclone washes contaminated soil of the first specific particle size or more by washing process water to discharge the purified soil. , The stepped continuous soil screening and differential pollution soil purification method according to each step characterized in that the contaminated soil classified as less than the first specific particle is treated as waste through scum sedimentation tank and scum filter press.
The method of claim 10,
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 an agglomeration thickener;
The concentrated soil is introduced into an acid dissolution tank, and the soil is acid eluted and purified by phosphoric acid; And
A stepwise continuous altitude screening and pollution load differential cleaning according to the step characterized in that it comprises a; step of the sediment concentrated by the polymer flocculant is added to the sedimentation concentration tank and the purified soil is introduced into the scum filter press.
The method of claim 10,
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,
Step-by-step continuous altitude screening and pollution load differential cleaning method according to the step characterized in that the washing process water discharged from the adsorption tower is introduced into at least one of the pretreatment unit, the foreign material remover and the purifying device.
13. The method of claim 12,
Step-by-step continuous altitude selection and pollution load differential pollution soil purification method characterized in that the neutralizing agent is a slaked lime is added to the neutralization tank. delete delete delete delete delete delete delete delete delete

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