CN103286123B - Process for treating heavy metal contaminated soil - Google Patents
Process for treating heavy metal contaminated soil Download PDFInfo
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- CN103286123B CN103286123B CN201310191073.9A CN201310191073A CN103286123B CN 103286123 B CN103286123 B CN 103286123B CN 201310191073 A CN201310191073 A CN 201310191073A CN 103286123 B CN103286123 B CN 103286123B
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Abstract
The invention relates to a process for treating heavy metal contaminated soil, and is used for restoring the heavy metal contaminated soil containing nickel, zinc, arsenic, lead and copper. The method comprises the following steps of: adding a pH regulator into the heavy metal contaminated soil to be restored; adding apatite and sulfides into the mixed heavy metal contaminated soil to be restored; adding a curing agent into the heavy metal contaminated soil to be restored; evenly stirring and standing; and continuously maintaining. According to the process, the pH regulator is added into the heavy metal contaminated soil, so that the pH value of the soil is increased, and preparations are made for the subsequent stabilization and solidification of the heavy metal pollution soil; then the apatite and the sulfides are added, so that the soil is stabilized effectively; and finally, the curing agent is added, so that the heavy metals in the soil are stabilized effectively, and therefore, the content of the heavy metals in the soil reaches the leaching standard.
Description
Technical field
The present invention relates to soil pollution and administer field, particularly, the present invention relates to a kind of technique for the heavy-metal contaminated soil that contains nickel, zinc, arsenic, lead, copper is repaired.
Background technology
Economic growth, industrialization and the urbanization of nearly 30 years have brought great material wealth to China, have also greatly improved the people's living standard.But, China has also paid heavy cost, the consumption of the energy and industrial and agricultural production activity have seriously destroyed Chinese ecological environment, atmosphere pollution, water pollute, soil and groundwater pollution threat the people's health and property safety, are also restricting the further sustainable development of China's economic.In recent years, soil and groundwater pollution is subject to people and pays close attention to greatly, is therefore badly in need of the recovery technique that research and development tally with the national condition.
Soil remediation technology can be divided into physics reparation, chemistry is repaired and biological restoration.The present invention adopts chemistry and physics recovery technique, and the heavy metal in contaminated soil is carried out to stable curing, produces a desired effect.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of for administering the technique of heavy-metal contaminated soil, the effectively heavy metal in stable curing contaminated soil, makes the content of beary metal of contaminated soil reach leaching standard.
The technical solution adopted for the present invention to solve the technical problems is: a kind of for administering the technique of heavy-metal contaminated soil, for the heavy-metal contaminated soil that contains nickel, zinc, arsenic, lead, copper is repaired, the reparation of heavy-metal contaminated soil is had to following concrete steps
A, in heavy-metal contaminated soil to be repaired, add pH adjusting agent, to be mixed placement after evenly carried out maintenance;
B, in mixed heavy-metal contaminated soil to be repaired, add apatite and sulfide, after uniform stirring, continue to place and carry out maintenance;
C, in heavy-metal contaminated soil to be repaired, add curing agent, after uniform stirring, place and proceed maintenance;
D, treat restoration of soil polluted by heavy metal and carry out sample detecting.
In heavy-metal contaminated soil, add pH adjusting agent, its effect is the pH value that increases soil, is the heavy metal stabilization in follow-up contaminated soil and curing preparing; In heavy-metal contaminated soil, add apatite and sulfide to make the each heavy metal species in contaminated soil start stabilisation; In heavy-metal contaminated soil, add curing agent to make contaminated soil start to realize curing.
Further, the pH adjusting agent adding in described step a is at least one in calcium oxide, magnesia.
Further, the sulfide adding in described step b is at least one in calcium sulfide, vulcanized sodium.
Further, the curing agent adding in described step c is at least one in cement, tripoli.
Further, described in the pH adjusting agent that the adds mass percent that accounts for heavy-metal contaminated soil to be repaired be 3%～5%,
The mass percent that the described apatite adding accounts for heavy-metal contaminated soil to be repaired is 1%～2%,
The mass percent that the described sulfide adding accounts for heavy-metal contaminated soil to be repaired is 1%～2%,
The mass percent that the described curing agent adding accounts for heavy-metal contaminated soil to be repaired is 3%～7%.
Further, in described step a, after interpolation pH adjusting agent, the time of maintenance is 12～24 hours;
In described step b, the curing time adding after apatite and sulfide is 36～48 hours;
In described step c, having added curing agent curing time is afterwards 12～24 hours.
Further, described heavy-metal contaminated soil to be repaired before carrying out step a, treat restoration of soil polluted by heavy metal carry out air-dry, grind broken after and sieve processing by 20 object nylon mesh.
The invention has the beneficial effects as follows: technique of the present invention, adding pH adjusting agent in heavy-metal contaminated soil, increase like this pH value of soil, be conducive to the precipitation of heavy metal in contaminated soil, for follow-up heavy-metal contaminated soil stabilisation and curing preparing, then by adding apatite and sulfide, so just can carry out effective stabilisation to soil; Finally adding curing agent, the effectively heavy metal in stable curing soil, makes heavy metal content in soil reach leaching standard.
In technique of the present invention, pH adjusting agent is at least one in calcium oxide, magnesia, sulfide is at least one in calcium sulfide, vulcanized sodium, curing agent is at least one in cement, tripoli, and these abundant raw material are convenient to obtain, and cheap, technique is simple, easily realizes large-scale production, and application suits large area to popularize.
Detailed description of the invention
Experiment is with soil from heavy metal pollution place, Jiangxi, and pollutant comprises nickel, zinc, arsenic, lead, copper.Contaminated soil through air-dry, grind broken after, sieve by 20 object nylon mesh.According to table 1(leaching characteristic identification standard value in GB5085.3-2007 " hazardous waste judging standard leaching characteristic identification ") analytical method listed carries out Leaching mensuration to contaminated soil.Through measuring, in contaminated soil, the mean concentration of each pollutant is as shown in the table.
Table 1 contaminated site Leaching of Heavy Metals concentration
In four embodiment, contaminated soil used all picks up from above-mentioned contaminated site below.
Embodiment 1
For the technique that the heavy-metal contaminated soil that contains nickel, zinc, arsenic, lead, copper is repaired, the reparation of heavy-metal contaminated soil is had to following concrete steps,
A, choose the heavy-metal contaminated soil to be repaired of the above-mentioned contaminated site of 500g, treat restoration of soil polluted by heavy metal carry out air-dry, grind broken after and sieve processing by 20 object nylon mesh;
B, in heavy-metal contaminated soil to be repaired, add 25g calcium oxide and mix, mixing rear placement and carry out maintenance 12 hours;
C, continuation add 10g apatite and 5g calcium sulfide in mixed heavy-metal contaminated soil to be repaired, after uniform stirring, place and carry out maintenance 36 hours;
D, continuation add 20g cement in heavy-metal contaminated soil to be repaired, place and proceed maintenance 24 hours after uniform stirring;
E, treat restoration of soil polluted by heavy metal and carry out sample detecting.
Table 2 is this experimental result.
Table 2 embodiment 1 experimental result
Embodiment 2
For the technique that the heavy-metal contaminated soil that contains nickel, zinc, arsenic, lead, copper is repaired, the reparation of heavy-metal contaminated soil is had to following concrete steps,
A, choose the heavy-metal contaminated soil to be repaired of the above-mentioned contaminated site of 500g, treat restoration of soil polluted by heavy metal carry out air-dry, grind broken after and sieve processing by 20 object nylon mesh;
B, in heavy-metal contaminated soil to be repaired, add 15g calcium oxide and mix, mixing rear placement and carry out maintenance 12 hours;
C, continuation add 5g apatite and 10g calcium sulfide in mixed heavy-metal contaminated soil to be repaired, after uniform stirring, place and carry out maintenance 36 hours;
D, continuation add 15g cement in heavy-metal contaminated soil to be repaired, place and proceed maintenance 24 hours after uniform stirring;
E, treat restoration of soil polluted by heavy metal and carry out sample detecting.
Table 3 is this experimental result.
Table 3 embodiment 2 experimental results
Embodiment 3
For the technique that the heavy-metal contaminated soil that contains nickel, zinc, arsenic, lead, copper is repaired, the reparation of heavy-metal contaminated soil is had to following concrete steps,
A, choose the heavy-metal contaminated soil to be repaired of the above-mentioned contaminated site of 500g, treat restoration of soil polluted by heavy metal carry out air-dry, grind broken after and sieve processing by 20 object nylon mesh;
B, in heavy-metal contaminated soil to be repaired, add 25g magnesia and mix, mixing rear placement and carry out maintenance 12 hours;
C, continuation add 10g apatite and 5g calcium sulfide in mixed heavy-metal contaminated soil to be repaired, after uniform stirring, place and carry out maintenance 48 hours;
D, continuation add 35g cement in heavy-metal contaminated soil to be repaired, place and proceed maintenance 18 hours after uniform stirring;
E, treat restoration of soil polluted by heavy metal and carry out sample detecting.
Table 4 is this experimental result.
Table 4 embodiment 3 experimental results
Embodiment 4
For the technique that the heavy-metal contaminated soil that contains nickel, zinc, arsenic, lead, copper is repaired, the reparation of heavy-metal contaminated soil is had to following concrete steps,
A, choose the heavy-metal contaminated soil to be repaired of the above-mentioned contaminated site of 500g, treat restoration of soil polluted by heavy metal carry out air-dry, grind broken after and sieve processing by 20 object nylon mesh;
B, in heavy-metal contaminated soil to be repaired, add 20g magnesia and mix, mixing rear placement and carry out maintenance 12 hours;
C, continuation add 5g apatite and 10g calcium sulfide in mixed heavy-metal contaminated soil to be repaired, after uniform stirring, place and carry out maintenance 48 hours;
D, continuation add 30g cement in heavy-metal contaminated soil to be repaired, place and proceed maintenance 18 hours after uniform stirring;
E, treat restoration of soil polluted by heavy metal and carry out sample detecting.
Table 5 is this experimental result.
Table 5 embodiment 4 experimental results
Embodiment 5
For the technique that the heavy-metal contaminated soil that contains nickel, zinc, arsenic, lead, copper is repaired, the reparation of heavy-metal contaminated soil is had to following concrete steps,
A, choose the heavy-metal contaminated soil to be repaired of the above-mentioned contaminated site of 500g, treat restoration of soil polluted by heavy metal carry out air-dry, grind broken after and sieve processing by 20 object nylon mesh;
B, in heavy-metal contaminated soil to be repaired, add 20g magnesia and mix, mixing rear placement and carry out maintenance 24 hours;
C, continuation add 5g apatite and 8g vulcanized sodium in mixed heavy-metal contaminated soil to be repaired, after uniform stirring, place and carry out maintenance 45 hours;
D, continuation add 30g tripoli in heavy-metal contaminated soil to be repaired, place and proceed maintenance 12 hours after uniform stirring;
E, treat restoration of soil polluted by heavy metal and carry out sample detecting.
Table 6 is this experimental result.
Table 6 embodiment 5 experimental results
In technique of the present invention, in heavy-metal contaminated soil, add pH adjusting agent, its effect is the pH value that increases soil, is conducive to the precipitation of heavy metal in contaminated soil, is the heavy metal stabilization in follow-up contaminated soil and curing preparing; In heavy-metal contaminated soil, add apatite and sulfide to make the each heavy metal species in contaminated soil start stabilisation; In heavy-metal contaminated soil, add curing agent to make contaminated soil start to realize curing.
Above-mentioned experimental result shows, technique of the present invention can obviously reduce the content of 5 heavy metal species in contaminated soil, 5 kinds of pollutant levels in embodiment are all lower than national standard limit value, so the present invention can reduce the leaching concentration of the heavy metal in contaminated soil fast and efficiently, can be used for the improvement reparation of heavy-metal contaminated soil.
Taking above-mentioned foundation desirable embodiment of the present invention as enlightenment, by above-mentioned description, relevant staff can, not departing from the scope of this invention technological thought, carry out various change and amendment completely.The technical scope of this invention is not limited to the content on description, must determine its technical scope according to claim scope.
Claims (1)
1. one kind for administering the technique of heavy-metal contaminated soil, it is characterized in that: for the heavy-metal contaminated soil that contains nickel, zinc, arsenic, lead, copper is repaired, to treat before the reparation of heavy-metal contaminated soil restoration of soil polluted by heavy metal carry out air-dry, grind broken after and sieve processing by 20 object nylon mesh, then carry out following concrete steps
A, in heavy-metal contaminated soil to be repaired, add pH adjusting agent, to be mixed placement after evenly carried out maintenance; B, in mixed heavy-metal contaminated soil to be repaired, add apatite and sulfide, after uniform stirring, continue to place and carry out maintenance; C, in heavy-metal contaminated soil to be repaired, add curing agent, after uniform stirring, place and proceed maintenance; D, treat restoration of soil polluted by heavy metal and carry out sample detecting;
The pH adjusting agent adding in described step a is at least one in calcium oxide, magnesia; The sulfide adding in described step b is at least one in calcium sulfide, vulcanized sodium; The curing agent adding in described step c is at least one in cement, tripoli;
The mass percent that the described pH adjusting agent adding accounts for heavy-metal contaminated soil to be repaired is 3%～5%, the mass percent that the described apatite adding accounts for heavy-metal contaminated soil to be repaired is 1%～2%, the mass percent that the described sulfide adding accounts for heavy-metal contaminated soil to be repaired is 1%～2%, described in the curing agent that the adds mass percent that accounts for heavy-metal contaminated soil to be repaired be 3%～7%;
In described step a, after interpolation pH adjusting agent, the time of maintenance is 12～24 hours; In described step b, the curing time adding after apatite and sulfide is 36～48 hours; In described step c, having added curing agent curing time is afterwards 12～24 hours.
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| CN103752597B (en) * | 2014-02-13 | 2015-09-23 | 南京农业大学 | A kind of method utilizing fixative synergy heat treatment heavy metal in soil |
| CN103894404B (en) * | 2014-03-06 | 2016-06-29 | 华南理工大学 | A kind of method of restoration of soil polluted by heavy metal |
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Address after: 2188 No. 213022 Jiangsu province Zhonglou District of Changzhou City Avenue Patentee after: SUNTIME ENVIRONMENTAL REMEDIATION CO., LTD. Address before: 213022 Taihu road Jiangsu city Changzhou province Xinbei hi tech Zone No. 30 Patentee before: Jiangsu Suntime Environmental Remediation Co., Ltd. |
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Address after: 213000 2188 Longcheng Road, Zhong Lou District, Changzhou, Jiangsu Patentee after: Shanda Environmental Restoration Co., Ltd. Address before: 213022 No. 2188 Longcheng Avenue, Zhonglou District, Changzhou City, Jiangsu Province Patentee before: SUNTIME ENVIRONMENTAL REMEDIATION CO., LTD. |