CN112588803A - Restoration equipment and restoration method for engineering heavy metal arsenic and lead polluted soil - Google Patents
Restoration equipment and restoration method for engineering heavy metal arsenic and lead polluted soil Download PDFInfo
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- CN112588803A CN112588803A CN202011419593.7A CN202011419593A CN112588803A CN 112588803 A CN112588803 A CN 112588803A CN 202011419593 A CN202011419593 A CN 202011419593A CN 112588803 A CN112588803 A CN 112588803A
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/28—Moving screens not otherwise provided for, e.g. swinging, reciprocating, rocking, tilting or wobbling screens
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
- B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
- B07B1/4609—Constructional details of screens in general; Cleaning or heating of screens constructional details of screening surfaces or meshes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/02—Cleaning by the force of jets or sprays
Abstract
The invention discloses a device and a method for repairing engineering heavy metal arsenic and lead polluted soil. The repair equipment comprises a pulp making system, a screening and flushing system, a leaching and leaching system and a dewatering system which are sequentially connected. The repairing method comprises (1) pulping; (2) screening and washing; (3) leaching and leaching; (4) and (4) dehydrating. The invention improves key parameters such as slurrying water-soil ratio, screening washing water-soil ratio, medicament leaching solution-solid ratio and the like, simultaneously, according to the properties of soil in south and north, clay soil in south is more beneficial to the adhesion of heavy metals such as arsenic, lead and the like, the grain size grading limit of screening washing and medicament leaching in the repairing process is defined, the economic cost accounting is carried out on the process, and the repairing equipment and the repairing method of the engineering soil polluted by heavy metals such as arsenic and lead are provided, so that the repairing efficiency of the soil can be economically and effectively improved.
Description
Technical Field
The invention relates to a device and a method for repairing engineering heavy metal arsenic and lead polluted soil, and belongs to the field of heavy metal soil repair.
Background
In recent years, with the rapid development of socioeconomic and high-intensity human activities, the national soil environment of China is not optimistic, the soil pollution of partial regions is serious, and the soil environment problem of industrial and mining waste lands is prominent. The total over-standard point ratio of the national soil is 16.1%, the over-standard point number of inorganic pollutants accounts for 82.8% of the total over-standard point number, wherein the over-standard point ratios of arsenic and lead are respectively 2.7% and 1.5%, the pollution area is large, the range is wide, and the detection rates of arsenic and lead in smelting plants and surrounding soil are high.
At present, a common restoration technology for heavy metal contaminated soil is a solidification stabilization and leaching technology, but a site needs to be monitored and maintained for a long time after solidification stabilization restoration is specified in a contaminated site restoration technology guideline solidification stabilization technology (trial) 2017, the long-term monitoring time is not less than 5 years in principle, so that the requirements on restoration technology, site and personnel management are high, and the circulation and utilization time of the site is increased, so that the leaching technology has the characteristics of high efficiency, short restoration period and the like, and becomes a common restoration means for heavy metal contaminated soil.
The existing heavy metal arsenic and lead leaching equipment still has defects, in the existing patent, CN111438178A discloses a soil leaching treatment method, introduces a leaching process, determines leaching parameters such as the type, concentration, liquid-solid ratio and the like of leaching agent, but does not determine key parameters such as particle size, water-soil ratio and the like entering the equipment in the running process of the leaching equipment, and does not consider the economy of leaching cost; CN105750316A discloses a multi-stage screening type ectopic soil leaching restoration method, 10mm, 2mm and 1mm are used as coarse screening grain sizes, 10mm is used as a washing grain size, soil is subjected to grain size classification and then is subjected to synergistic treatment by adopting a solidification and stabilization technology, in the embodiment, the leaching effect of northern soil is considered, but the difference of the properties of the northern and northern soil and the applicability of the solidification and stabilization technology to land utilization are not considered.
Disclosure of Invention
In view of the defects of the leaching equipment and the leaching method in the prior art, the invention aims to improve key parameters such as slurrying water-soil ratio, screening washing water-soil ratio, medicament leaching liquid-solid ratio and the like in the repairing process of the repairing equipment, simultaneously, according to the soil properties in the south and north, the clay soil in the south is more beneficial to the attachment of heavy metals such as arsenic, lead and the like, the grain size grading limit of screening washing and medicament leaching in the repairing process is defined, and the economic cost accounting is carried out on the process, so that the repairing equipment and the repairing method for the engineering soil polluted by the heavy metals such as arsenic and lead are provided, and the repairing efficiency of the soil can be economically and effectively improved.
Specifically, the invention adopts the following technical means:
the invention provides an engineered remediation device for heavy metal arsenic and lead polluted soil, which comprises a pulping system, a screening and flushing system, a leaching system and a dewatering system which are sequentially connected, wherein:
the pulping system comprises an alujou bucket, a feeding bin, a stirring feeder, a scrubbing machine and a crusher, wherein the alujou bucket, the feeding bin, the stirring feeder and the scrubbing machine are sequentially connected, and the crusher is connected with the alujou bucket and the feeding bin through branch lines; the polluted soil with the particle size smaller than the screened particle size of the aluqi bucket is sent to the feeding bin, and the polluted soil with the particle size larger than or equal to the screened particle size of the aluqi bucket is sent to the crusher and then sent to the feeding bin after being crushed; slurry obtained by pulping through the stirring feeder and the scrubbing machine is sent to the screening and washing system;
the screening and flushing system comprises a primary hydraulic vibrating screen, a secondary hydraulic vibrating screen and a tertiary hydraulic vibrating screen which are sequentially connected; each hydraulic vibrating screen is provided with a high-pressure spray device for screening and washing, oversize soil is sent to a discharging area, and undersize mud is sent to the leaching system;
the leaching and leaching system comprises a mud stirring tank, a hydrocyclone, a leaching stirring tank, a first inclined tube sedimentation tank, a dosing device, a mud stirring tank and a second inclined tube sedimentation tank, wherein the mud stirring tank, the hydrocyclone, the leaching stirring tank and the first inclined tube sedimentation tank are sequentially connected, the dosing device is connected with the leaching stirring tank, and the mud stirring tank and the second inclined tube sedimentation tank are sequentially connected with the hydrocyclone through branch lines; the mud with the particle size smaller than the separation particle size of the hydrocyclone is sent to the dehydration system through the mud stirring tank and the second inclined tube sedimentation tank, the mud with the particle size larger than or equal to the separation particle size of the hydrocyclone is sent to the leaching stirring tank, an eluent is supplied by the medicine adding device for leaching, and then the mud is sent to the dehydration system through the first inclined tube sedimentation tank;
the dehydration system comprises a first plate-and-frame filter press and a second plate-and-frame filter press which are respectively connected with a first inclined tube sedimentation tank and a second inclined tube sedimentation tank; and conveying the dehydrated soil obtained by the first plate-and-frame filter press and the second plate-and-frame filter press to a discharging area.
Preferably, the particle size of the alufagin is 50 mm.
Preferably, the weight ratio of the slurry making water and soil of the stirring feeder and the scrubbing machine is 3: 1.
preferably, the screen mesh diameters of the first-stage hydraulic vibrating screen, the second-stage hydraulic vibrating screen and the third-stage hydraulic vibrating screen are 10mm, 2mm and 0.5mm in sequence.
Preferably, the flushing water quantity of the high-pressure spraying device is 10% of the weight of oversize materials, and the flushing pressure is 350-500 bar.
Preferably, the separation particle size of the hydrocyclone is 0.075 mm.
Preferably, the first plate-and-frame filter press and the second plate-and-frame filter press are further connected with a water treatment device, and an outlet of the water treatment device is connected with the slurry making system and the screening and flushing system so as to purify and recycle the wastewater generated by dehydration.
The invention also provides a method for repairing the engineering heavy metal arsenic and lead polluted soil, which comprises the following steps:
(1) slurry making
Conveying the polluted soil to an Alluo bucket for screening, conveying the polluted soil with the particle size smaller than the screened particle size of the Alluo bucket to a feeding bin, conveying the polluted soil with the particle size larger than or equal to the screened particle size of the Alluo bucket to a crusher, crushing the polluted soil and then conveying the crushed polluted soil to the feeding bin; feeding the polluted soil in the feeding bin to a stirring feeder, adding water, stirring to initially make slurry, then feeding to a scrubbing machine for further making slurry, and feeding the obtained slurry to a subsequent screening and washing step;
(2) screening and washing
Conveying the slurry obtained in the step (1) to a first-stage hydraulic vibrating screen, a second-stage hydraulic vibrating screen and a third-stage hydraulic vibrating screen which are sequentially connected, carrying out high-pressure spraying while screening, conveying oversize soil to a discharging area, and conveying undersize slurry to a subsequent leaching and leaching step;
(3) leaching and leaching
Sending the slurry obtained in the step (2) to a slurry stirring tank for stirring, then sending the slurry to a hydrocyclone for separation, sending the slurry with the particle size smaller than the separation particle size of the hydrocyclone to a subsequent dehydration step through a slurry stirring tank and a second inclined tube sedimentation tank, sending the slurry with the particle size larger than or equal to the separation particle size of the hydrocyclone to a leaching stirring tank, adding a leaching agent for leaching, and then sending the slurry to the subsequent dehydration step through a first inclined tube sedimentation tank;
(4) dewatering
Delivering the slurry obtained in the first inclined tube sedimentation tank in the step (3) to a first plate-and-frame filter press for dehydration, and delivering the dehydrated soil to a discharging area; and (4) delivering the slurry obtained by the second inclined tube sedimentation tank in the step (3) to a second plate-and-frame filter press for dehydration, and delivering the dehydrated soil to a discharging area.
Preferably, the sieve particle size of the alufagin in the step (1) is 50 mm.
Preferably, the weight ratio of the slurrying water to soil in the slurrying in the step (1) is 3: 1.
preferably, in the step (2), the screen mesh diameters of the first-stage hydraulic vibrating screen, the second-stage hydraulic vibrating screen and the third-stage hydraulic vibrating screen are 10mm, 2mm and 0.5mm in sequence.
Preferably, the high-pressure spray in the step (2) has the rinsing water amount of 10% of the weight of oversize materials and the rinsing pressure of 350-500 bar.
Preferably, the separation particle size of the hydrocyclone in the step (3) is 0.075 mm.
Preferably, the eluent in the step (3) is FeCl of 0.1mol/L3The weight ratio of the addition amount of the eluting agent to the solid content of the slurry is 6: 1, the leaching time of the medicament is 30 min.
Preferably, the wastewater generated by the dehydration in the step (4) is further sent to a water treatment device for purification treatment, reaches the wastewater reuse standard after flocculation and deep filtration, and is recycled to the pulp making step and the screening and washing step.
Compared with the prior art, the invention has the beneficial effects that:
1. the invention determines the key parameters of the repair equipment and the repair process for the soil polluted by heavy metal arsenic and lead, determines the particle size range of screening and washing and the particle size limit of leaching according to the difference of the properties of the soil in the south and north, and greatly reduces the water consumption and the wastewater treatment capacity on the premise of ensuring the repair effect compared with the existing repair equipment and repair process parameters. For example, in terms of water consumption, in the screening and washing stage, the common washing water-soil ratio in the existing engineering case is 2: 1, waste of water resource is caused, and the treatment pressure of waste water is increased, while the flushing water quantity of the invention is only 10% of the weight of oversize materials. For another example, in terms of the treatment capacity of wastewater, the wastewater in the dehydration stage is treated and recycled, and the recycling rate is not lower than 90%.
2. Through economic cost accounting, the equipment and the method for repairing the engineering heavy metal arsenic and lead polluted soil can economically and effectively improve the repairing efficiency of the soil, the large-particle-size soil (more than or equal to 0.075mm) obtained through repairing can reach the soil pollution risk control standard (trial) for soil environment quality construction land (GB36600-2018), the small-particle soil (less than 0.075mm) can reach the solid waste pollution control standard (GB30485-2013) for cement kiln co-disposal, and the small-particle-size soil can be transported to the cement kiln for utilization.
Drawings
FIG. 1 is a connection diagram of an engineered remediation device for heavy metal arsenic and lead contaminated soil according to the invention.
Detailed Description
The invention will be further described with reference to specific embodiments, and the advantages and features of the invention will become apparent as the description proceeds. These examples are illustrative only and do not limit the scope of the present invention in any way. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention, and that such changes and modifications may be made without departing from the spirit and scope of the invention.
Example 1
Referring to fig. 1, the embodiment provides an engineered remediation device for heavy metal arsenic and lead contaminated soil, which includes a slurrying system, a screening and washing system, a leaching system and a dewatering system, which are connected in sequence, wherein:
the pulping system comprises an alujou bucket, a feeding bin, a stirring feeder, a scrubbing machine and a crusher, wherein the alujou bucket, the feeding bin, the stirring feeder and the scrubbing machine are sequentially connected, and the crusher is connected with the alujou bucket and the feeding bin through branch lines; in this embodiment, the sieve particle size of the alufagin is 50mm, the contaminated soil with the particle size smaller than 50mm is sent to the feeding bin, and the contaminated soil with the particle size greater than or equal to 50mm is sent to the crusher and then sent to the feeding bin after being crushed; in this embodiment, the slurry making water-soil weight ratio of the mixer feeder to the scrubber is 3: 1, slurry obtained by pulping through the stirring feeder and the scrubbing machine is sent to the screening and washing system;
the screening and flushing system comprises a primary hydraulic vibrating screen, a secondary hydraulic vibrating screen and a tertiary hydraulic vibrating screen which are sequentially connected; in the embodiment, the aperture of the screen mesh of the first-stage hydraulic vibrating screen, the aperture of the second-stage hydraulic vibrating screen and the aperture of the screen mesh of the third-stage hydraulic vibrating screen are 10mm, 2mm and 0.5mm in sequence, each hydraulic vibrating screen is provided with a high-pressure spraying device for screening and washing, the washing water quantity of the high-pressure spraying device is 10% of the weight of oversize products, the washing pressure is 350-500bar, the oversize product soil is sent to a discharging area, and the undersize product slurry is sent to the leaching and leaching system;
the leaching and leaching system comprises a mud stirring tank, a hydrocyclone, a leaching stirring tank, a first inclined tube sedimentation tank, a dosing device, a mud stirring tank and a second inclined tube sedimentation tank, wherein the mud stirring tank, the hydrocyclone, the leaching stirring tank and the first inclined tube sedimentation tank are sequentially connected, the dosing device is connected with the leaching stirring tank, and the mud stirring tank and the second inclined tube sedimentation tank are sequentially connected with the hydrocyclone through branch lines; in the embodiment, the slurry with the separation particle size of 0.075mm and the particle size of less than 0.075mm of the hydrocyclone is sent to the dewatering system through the slurry stirring tank and the second inclined tube sedimentation tank, and the slurry with the particle size of more than or equal to 0.075mm is sent to the leaching stirring tank, and the leaching agent is supplied by the dosing device to leach, and then the leaching agent is sent to the dewatering system through the first inclined tube sedimentation tank;
the dehydration system comprises a first plate-and-frame filter press and a second plate-and-frame filter press which are respectively connected with a first inclined tube sedimentation tank and a second inclined tube sedimentation tank; conveying the dehydrated soil obtained by the first plate-and-frame filter press and the second plate-and-frame filter press to a discharging area;
the first plate-and-frame filter press and the second plate-and-frame filter press are further connected with water treatment equipment, and an outlet of the water treatment equipment is connected with the slurry making system and the screening and flushing system so as to purify and recycle the wastewater generated by dehydration.
Example 2
In the embodiment, the arsenic and lead polluted soil in the site left by a certain smelting plant in Guangdong is taken as a treatment target, the stratum of the polluted soil is distributed into miscellaneous fill, silty clay and sandy clay, and the particle size is>The weight percentages of the soil particles with the thickness of 0.5mm and less than or equal to 0.075mm are respectively 70% and 16%, the highest proportion of arsenic and lead residues in the soil is 40% -50%, and the second is about 30% of water-soluble state. Particle size in soil remediation process>0.5mm arsenic and lead polluted soil is washed by physical screening to remove loosely adhered pollutants on the surface of the polluted soil, and FeCl is used3The leaching agent is a leaching agent for leaching polluted soil with the grain size of 0.075-0.5mm to effectively remove arsenic and lead in the polluted soil, and the specific method and related detection conditions are as follows:
(1) slurry making
The method comprises the following steps of (1) screening the polluted soil by an Arugu bucket with the particle size of 50mm, conveying the polluted soil with the particle size of less than 50mm to a feeding bin, conveying the polluted soil with the particle size of more than or equal to 50mm to a crusher, crushing and conveying the crushed polluted soil to the feeding bin, so as to prevent the damage to subsequent equipment caused by overlarge particle size; and (3) conveying the polluted soil in the feeding bin to a stirrer feeder, adding water, stirring to make slurry preliminarily, and then conveying to a scrubbing machine for further making slurry, wherein the weight ratio of the slurry making water to soil is 3: 1, scrubbing to separate pollutants and clay particles in the polluted soil from the surface of gravel, and conveying the obtained slurry to a subsequent screening and washing step;
(2) screening and washing
Through detection, the initial concentration of main pollutants in the slurry obtained in the step (1) is 1121mg/kg of arsenic and 1240mg/kg of lead, the slurry is sent to a 10 mm-particle-size first-stage hydraulic vibrating screen, a 2 mm-particle-size second-stage hydraulic vibrating screen and a 0.5 mm-particle-size third-stage hydraulic vibrating screen which are connected in sequence, and the heavy metal arsenic and the lead in the southern cohesive soil are high in adhesiveness and are not easy to elute, so that high-pressure spraying is carried out by using a high-pressure spraying device arranged on each hydraulic vibrating screen during screening so as to ensure that the surface of soil particles is completely washed, the washing water amount is 10% of the weight of oversize materials, the washing pressure is 350-500bar, after full screening and washing, the oversize material soil is conveyed to a discharging area through a belt, and after screening and washing, the concentrations of the arsenic in the oversize material soil with the particle sizes of 10mm, 2mm and 0.5mm are respectively 26.4mg, 50.1mg/kg, wherein the lead concentration is respectively 38.2mg/kg, 45mg/kg and 62.7mg/kg, which all meet the soil pollution risk management and control standard (trial) for soil environment quality construction land (GB36600-2018), and the undersize slurry is sent to the subsequent leaching and leaching step;
(3) leaching and leaching
With the reduction of the soil particle size, the screening and washing effect is weakened, so the slurry obtained in the step (2) is sent to a slurry stirring tank for stirring, then sent to a 0.075mm particle size hydrocyclone for separation, the slurry with the particle size smaller than 0.075mm is sent to the subsequent dehydration step through a slurry stirring tank and a second inclined tube sedimentation tank, the slurry with the particle size larger than or equal to 0.075mm is sent to a leaching stirring tank, leaching agent is added for leaching, and then sent to the subsequent dehydration step through a first inclined tube sedimentation tank; the eluent is FeCl with 0.1mol/L3The weight ratio of the addition amount of the eluting agent to the solid content of the slurry is 6: 1, leaching the medicament for 30 min;
(4) dewatering
Conveying the slurry obtained by the first inclined tube sedimentation tank in the step (3) to a first plate-and-frame filter press for dewatering, conveying the dewatered soil to a discharge area through a belt, and detecting that the concentrations of arsenic and lead in the dewatered soil are 51mg/kg and 300mg/kg respectively, so that the concentrations of arsenic and lead in the dewatered soil meet the soil pollution risk control standard (trial) for soil environmental quality construction land (GB 36600-2018); delivering the slurry obtained by the second inclined tube sedimentation tank in the step (3) to a second plate-and-frame filter press for dewatering, delivering the dewatered soil to a discharging area through a belt, detecting that the concentrations of arsenic and lead in the dewatered soil are 237mg/kg and 4500mg/kg respectively, which reach the pollution control standard of cement kiln co-processing solid waste (GB30485-2013), and then transferring the slurry to a cement kiln for utilization;
(5) water treatment
And (3) detecting that the amount of the wastewater generated by the dehydration of each square of soil in the step (4) is restored to 4.273 squares, sending the wastewater to water treatment equipment for purification treatment, performing flocculation and deep filtration to reach the wastewater reuse standard, and reusing the wastewater in the pulping step and the screening and washing step, wherein the reuse rate is not lower than 90%.
Claims (9)
1. The utility model provides an engineering's repair equipment of heavy metal arsenic, plumbous contaminated soil which characterized in that, including the slurrying system that connects gradually, screening rinse-system, drip washing leaching system and dewatering system, wherein:
the pulping system comprises an alujou bucket, a feeding bin, a stirring feeder, a scrubbing machine and a crusher, wherein the alujou bucket, the feeding bin, the stirring feeder and the scrubbing machine are sequentially connected, and the crusher is connected with the alujou bucket and the feeding bin through branch lines; the polluted soil with the particle size smaller than the screened particle size of the aluqi bucket is sent to the feeding bin, and the polluted soil with the particle size larger than or equal to the screened particle size of the aluqi bucket is sent to the crusher and then sent to the feeding bin after being crushed; slurry obtained by pulping through the stirring feeder and the scrubbing machine is sent to the screening and washing system;
the screening and flushing system comprises a primary hydraulic vibrating screen, a secondary hydraulic vibrating screen and a tertiary hydraulic vibrating screen which are sequentially connected; each hydraulic vibrating screen is provided with a high-pressure spray device for screening and washing, oversize soil is sent to a discharging area, and undersize mud is sent to the leaching system;
the leaching and leaching system comprises a mud stirring tank, a hydrocyclone, a leaching stirring tank, a first inclined tube sedimentation tank, a dosing device, a mud stirring tank and a second inclined tube sedimentation tank, wherein the mud stirring tank, the hydrocyclone, the leaching stirring tank and the first inclined tube sedimentation tank are sequentially connected, the dosing device is connected with the leaching stirring tank, and the mud stirring tank and the second inclined tube sedimentation tank are sequentially connected with the hydrocyclone through branch lines; the mud with the particle size smaller than the separation particle size of the hydrocyclone is sent to the dehydration system through the mud stirring tank and the second inclined tube sedimentation tank, the mud with the particle size larger than or equal to the separation particle size of the hydrocyclone is sent to the leaching stirring tank, an eluent is supplied by the medicine adding device for leaching, and then the mud is sent to the dehydration system through the first inclined tube sedimentation tank;
the dehydration system comprises a first plate-and-frame filter press and a second plate-and-frame filter press which are respectively connected with a first inclined tube sedimentation tank and a second inclined tube sedimentation tank; and conveying the dehydrated soil obtained by the first plate-and-frame filter press and the second plate-and-frame filter press to a discharging area.
2. The prosthetic device of claim 1, wherein:
the sieving particle size of the alufagin is 50 mm;
the screen mesh diameters of the first-stage hydraulic vibrating screen, the second-stage hydraulic vibrating screen and the third-stage hydraulic vibrating screen are 10mm, 2mm and 0.5mm in sequence;
the separation particle size of the hydrocyclone is 0.075 mm.
3. The prosthetic device of claim 1, wherein:
the slurry making water-soil weight ratio of the stirring feeder to the scrubbing machine is 3: 1;
the flushing water quantity of the high-pressure spraying device is 10% of the weight of oversize materials, and the flushing pressure is 350-500 bar.
4. The prosthetic device of claim 1, wherein:
the first plate-and-frame filter press and the second plate-and-frame filter press are further connected with water treatment equipment, and an outlet of the water treatment equipment is connected with the slurry making system and the screening and flushing system so as to purify and recycle the wastewater generated by dehydration.
5. The method for repairing the soil polluted by the heavy metals of arsenic and lead is characterized by comprising the following steps:
(1) slurry making
Conveying the polluted soil to an Alluo bucket for screening, conveying the polluted soil with the particle size smaller than the screened particle size of the Alluo bucket to a feeding bin, conveying the polluted soil with the particle size larger than or equal to the screened particle size of the Alluo bucket to a crusher, crushing the polluted soil and then conveying the crushed polluted soil to the feeding bin; feeding the polluted soil in the feeding bin to a stirring feeder, adding water, stirring to initially make slurry, then feeding to a scrubbing machine for further making slurry, and feeding the obtained slurry to a subsequent screening and washing step;
(2) screening and washing
Conveying the slurry obtained in the step (1) to a first-stage hydraulic vibrating screen, a second-stage hydraulic vibrating screen and a third-stage hydraulic vibrating screen which are sequentially connected, carrying out high-pressure spraying while screening, conveying oversize soil to a discharging area, and conveying undersize slurry to a subsequent leaching and leaching step;
(3) leaching and leaching
Sending the slurry obtained in the step (2) to a slurry stirring tank for stirring, then sending the slurry to a hydrocyclone for separation, sending the slurry with the particle size smaller than the separation particle size of the hydrocyclone to a subsequent dehydration step through a slurry stirring tank and a second inclined tube sedimentation tank, sending the slurry with the particle size larger than or equal to the separation particle size of the hydrocyclone to a leaching stirring tank, adding a leaching agent for leaching, and then sending the slurry to the subsequent dehydration step through a first inclined tube sedimentation tank;
(4) dewatering
Delivering the slurry obtained in the first inclined tube sedimentation tank in the step (3) to a first plate-and-frame filter press for dehydration, and delivering the dehydrated soil to a discharging area; and (4) delivering the slurry obtained by the second inclined tube sedimentation tank in the step (3) to a second plate-and-frame filter press for dehydration, and delivering the dehydrated soil to a discharging area.
6. The repair method according to claim 5, characterized in that:
the sieving particle size of the alufeng in the step (1) is 50 mm;
in the step (2), the screen mesh diameters of the first-stage hydraulic vibrating screen, the second-stage hydraulic vibrating screen and the third-stage hydraulic vibrating screen are 10mm, 2mm and 0.5mm in sequence;
and (4) the separation particle size of the hydrocyclone in the step (3) is 0.075 mm.
7. The repair method according to claim 5, characterized in that:
the slurry making water-soil weight ratio of the slurry making in the step (1) is 3: 1;
the flushing water amount of the high-pressure spraying in the step (2) is 10% of the weight of oversize materials, and the flushing pressure is 350-500 bar.
8. The repair method according to claim 5, characterized in that:
the eluent in the step (3) is FeCl with 0.1mol/L3The weight ratio of the addition amount of the eluting agent to the solid content of the slurry is 6: 1, the leaching time of the medicament is 30 min.
9. The repair method according to claim 5, characterized in that:
and (4) further conveying the wastewater generated in the step (4) to water treatment equipment for purification treatment, performing flocculation and deep filtration to reach the wastewater reuse standard, and reusing the wastewater in the pulping step and the screening and washing step.
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| CN202011419593.7A CN112588803A (en) | 2020-12-07 | 2020-12-07 | Restoration equipment and restoration method for engineering heavy metal arsenic and lead polluted soil |
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| CN202011419593.7A CN112588803A (en) | 2020-12-07 | 2020-12-07 | Restoration equipment and restoration method for engineering heavy metal arsenic and lead polluted soil |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351637A (en) * | 2021-06-10 | 2021-09-07 | 上海城投上境生态修复科技有限公司 | Contaminated soil leaching-grading leaching repair device and repair process |
| CN114682618A (en) * | 2022-03-25 | 2022-07-01 | 郑州德森环境科技有限公司 | High-efficient hierarchical module that soaks of soil leaching chemistry |
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2020
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113351637A (en) * | 2021-06-10 | 2021-09-07 | 上海城投上境生态修复科技有限公司 | Contaminated soil leaching-grading leaching repair device and repair process |
| CN114682618A (en) * | 2022-03-25 | 2022-07-01 | 郑州德森环境科技有限公司 | High-efficient hierarchical module that soaks of soil leaching chemistry |
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