CN107309259B - Copper-polluted farmland stabilization-field management and control combined remediation method - Google Patents
Copper-polluted farmland stabilization-field management and control combined remediation method Download PDFInfo
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- CN107309259B CN107309259B CN201710717977.9A CN201710717977A CN107309259B CN 107309259 B CN107309259 B CN 107309259B CN 201710717977 A CN201710717977 A CN 201710717977A CN 107309259 B CN107309259 B CN 107309259B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
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Abstract
The invention discloses a copper-polluted farmland stabilization-field management and control combined remediation method, which comprises the following steps: s1: ploughing a farmland to be restored, stripping stones and weeds from the farmland, leveling soil on the surface of the farmland, and inserting a heavy metal adsorption rod into the soil; s2: after the heavy metal adsorption rod is inserted, pouring a clean water source into the restored farmland, and keeping the submerged state for 8-12 d; s3: and (3) drying the residual water in the farmland, uniformly throwing lime powder into the farmland after the farmland is dried, fully ploughing and mixing, ploughing once every 3-5 d, keeping the ploughing depth at 25-35 cm every time, and continuously ploughing for 18-22 d, thus finishing the restoration of the copper-polluted farmland. The restoration method provided by the invention adopts stabilization and field management measures to carry out combined restoration treatment, avoids the limitation of a single restoration technology, and has the advantages of low restoration cost, short restoration time and simple and convenient operation, thereby obviously reducing the effective copper content in the soil.
Description
Technical Field
The invention belongs to the technical field of heavy metal contaminated farmland soil remediation, and particularly relates to a copper contaminated farmland stabilization-field management and control combined remediation method.
Background
Copper is a trace element necessary for normal growth and development of organisms, but excessive copper can interfere with normal physiological functions of animals, plants and people. The development of mines, the discharge of industrial three wastes and the unreasonable use of municipal domestic waste, sludge and copper-containing pesticides all cause the copper content in soil, particularly farmland soil to be increased sharply. The crops can absorb copper in the soil again and enter human bodies through food to harm human health. Copper pollution is the most common one of soil heavy metal pollution, and aiming at the existing soil heavy metal pollution condition, the conventional remediation means mainly comprises the technical measures of solidification, leaching, cement kiln cooperative treatment, phytoremediation and the like. The curing and cement kiln cooperative treatment technology has large energy consumption and high cost; a large amount of eluting agent is consumed in the leaching technology, and secondary pollution is easily caused due to improper leaching; although the plant restoration is environment-friendly, has no secondary pollution and lower cost, the treatment time is longer and the restoration efficiency is relatively low.
Based on the defects of the method for restoring the copper pollution in the soil in the prior art, the invention provides a method for restoring the copper pollution in farmland stabilization-field control combination.
Disclosure of Invention
The invention aims to solve the defects in the prior art and provides a copper-polluted farmland stabilization-field management and control combined remediation method.
A copper-polluted farmland stabilization-field management and control combined remediation method comprises the following steps:
s1: ploughing a farmland to be restored, stripping stones and weeds from the farmland, leveling soil on the surface of the farmland, inserting heavy metal adsorption rods into the soil, wherein the distance between every two adjacent heavy metal adsorption rods is 20-25 cm;
s2: after the heavy metal adsorption rod is inserted, a clean water source is poured into the restored farmland, when the surface layer of the farmland is soaked into the farmland, the clean water source is poured into the farmland, the operation is repeated, and the submerged state is kept for 8-12 d;
s3: draining residual water in the farmland, uniformly throwing lime powder into the farmland after a 10-20 cm soil layer of the farmland falls to be dry, fully ploughing and mixing, ploughing once every 3-5 days, keeping the ploughing depth at 25-35 cm every time, and continuously ploughing for 18-22 days, namely finishing the restoration of the combination of copper pollution farmland stabilization and field management and control.
Preferably, the heavy metal adsorption rod is made of attapulgite.
Preferably, the specific surface area of the attapulgite is 150-180 m2The content of the attapulgite in the attapulgite is more than 75 percent.
Preferably, the heavy metal adsorption rods have the following dimensions: the length is 35-45 cm, and the diameter is 4-6 cm.
Preferably, the submerging state in the step S2 is that the clean water source submerges 1-2 cm of surface soil of the farmland.
Preferably, the addition amount of the lime powder is 110-130 kg/mu, and the throwing speed of the lime powder is 3-5 g/min.
Attapulgite, also called Palygorskite (Palygorskite) or Palygorskite, is a chain with chainsLayered structureThe water-containing magnesium-rich aluminosilicate clay mineral of (1), the structure of which belongs to 2: type 1Clay mineralIn aEach of 2: in the 1 unit structure layer, the tetrahedral wafer angle tops are reversed at a certain distance to form a layer chain.
According to the copper-polluted farmland stabilization-field management and control combined remediation method, aiming at heavy metal copper-polluted farmland soil, the heavy metal adsorption rod made of attapulgite is added firstly, then the lime powder is added to form a stabilization mode, and the field management measures are matched to carry out combined remediation treatment, so that the limitation of a single remediation technology is avoided, the remediation cost and the remediation time are effectively controlled, the operation is simple and convenient, the field test shows that the effective copper content in the farmland soil can be reduced by more than 80%, and a new way is developed for remediation of the copper-polluted farmland soil.
Detailed Description
The invention provides a copper-polluted farmland stabilization-field management and control combined remediation method, which comprises the following steps:
s1: ploughing a farmland to be restored, stripping stones and weeds from the farmland, leveling soil on the surface of the farmland, inserting heavy metal adsorption rods into the soil, wherein the distance between every two adjacent heavy metal adsorption rods is 20-25 cm;
s2: after the heavy metal adsorption rod is inserted, a clean water source is poured into the restored farmland, when the surface layer of the farmland is soaked into the farmland, the clean water source is poured into the farmland, the operation is repeated, and the submerged state is kept for 8-12 d;
s3: draining residual water in the farmland, uniformly throwing lime powder into the farmland after a 10-20 cm soil layer of the farmland falls to be dry, fully ploughing and mixing, ploughing once every 3-5 days, keeping the ploughing depth at 25-35 cm every time, and continuously ploughing for 18-22 days, namely finishing the restoration of the combination of copper pollution farmland stabilization and field management and control.
Preferably, the heavy metal adsorption rod is made of attapulgite.
Attapulgite, also called Palygorskite (Palygorskite) or Palygorskite, is a chain with chainsLayered structureThe water-containing magnesium-rich aluminosilicate clay mineral of (1), the structure of which belongs to 2: type 1Clay mineralAt each of 2: in 1 unit structure layer, the corner vertices of the tetrahedral wafer are reversed at a certain distance to form a layerIn a chain shape.
Preferably, the specific surface area of the attapulgite is 150-180 m2The content of the attapulgite in the attapulgite is more than 75 percent.
Preferably, the heavy metal adsorption rods have the following dimensions: the length is 35-45 cm, and the diameter is 4-6 cm.
Preferably, the submerging state in the step S2 is that the clean water source submerges 1-2 cm of surface soil of the farmland.
Preferably, the addition amount of the lime powder is 110-130 kg/mu, and the throwing speed of the lime powder is 3-5 g/min.
According to the copper-polluted farmland stabilization-field management and control combined remediation method, aiming at heavy metal copper-polluted farmland soil, the heavy metal adsorption rod made of attapulgite is added firstly, then the lime powder is added to form a stabilization mode, and the field management measures are matched to carry out combined remediation treatment, so that the limitation of a single remediation technology is avoided, the remediation cost and the remediation time are effectively controlled, the operation is simple and convenient, the field test shows that the effective copper content in the farmland soil can be reduced by more than 80%, and a new way is developed for remediation of the copper-polluted farmland soil.
The present invention will be further illustrated with reference to the following specific examples.
Example one
Selecting a test base, wherein the basic physicochemical properties of the test soil are as follows: 19.12 g/kg of organic matters, 0.76g/kg of total nitrogen, 52.8 mg/kg of alkaline hydrolysis nitrogen, 32.7 mg/kg of available phosphorus and 150 mg/kg of quick-acting potassium; the effective copper content in the soil is 184.3mg/kg, the selected area of the test field is about 2 mu, the treatment is divided into 2 treatments of contrast and combined restoration, and 4 times of treatment is set for each treatment.
The combined remediation is carried out by using the copper-polluted farmland stabilization-field management and control combined remediation method provided by the invention, and the specific operation steps are as follows:
s1: ploughing a farmland to be restored, stripping stones and weeds from the farmland, leveling soil on the surface of the farmland, inserting heavy metal adsorption rods into the soil, wherein the distance between every two adjacent heavy metal adsorption rods is 25cm, and the weight of the heavy metal adsorption rods is higher than that of the heavy metal adsorption rodsThe metal adsorption rod is made of attapulgite, and the specific surface area of the attapulgite is about 160m2The content of attapulgite in the attapulgite is more than 75%, and the size of the heavy metal adsorption rod is as follows: the length is 40cm, and the diameter is 5 cm;
s2: after the heavy metal adsorption rod is inserted, a clean water source is poured into the restored farmland, when the surface layer of the farmland is soaked into the farmland, the clean water source is poured into the farmland, the operation is repeated, the clean water source is kept to be 1-2 cm higher than the soil on the surface layer of the farmland, and the operation is kept for 10 days;
s3: draining residual water in the farmland, uniformly throwing lime powder into the farmland when a soil layer between 10-20 cm of the farmland falls dry, wherein the addition amount of the lime powder is 120 kg/mu, the throwing speed of the lime powder is controlled at 5g/min, the lime powder is fully ploughed and mixed, ploughing is carried out once every 4d, the ploughing depth is kept at 25-35 cm every time, and ploughing is continued for 20d, so that the remediation of the copper-polluted farmland is completed.
The contrast treatment field water management is consistent with the combined restoration treatment field management measures, and the differences are
In that the soil in the control treated area was not subjected to the addition of attapulgite and lime.
Example two
The basic physicochemical properties of the test soil are as follows: 21.14 g/kg of organic matters, 0.81 g/kg of total nitrogen, 54.1 mg/kg of alkaline hydrolysis nitrogen, 30.6 mg/kg of available phosphorus and 120mg/kg of quick-acting potassium; the effective copper content in the soil is 182.5mg/kg, the selected area of the test field is about 2 mu, the treatment is divided into 2 treatments of contrast and combined restoration, and 4 times of treatment are set for each treatment.
The combined remediation is carried out by using the copper-polluted farmland stabilization-field management and control combined remediation method provided by the invention, and the specific operation steps are as follows:
s1: ploughing a farmland to be restored, stripping stones and weeds from the farmland, leveling soil on the surface of the farmland, inserting heavy metal adsorption rods into the soil, wherein the distance between every two adjacent heavy metal adsorption rods is 20cm, the heavy metal adsorption rods are made of attapulgite, and the specific surface area of the attapulgite is 160m2The content of attapulgite in the attapulgite is more than 75 percent, and the heavy gold isThe sizes of the adsorption rods are as follows: the length is 45cm, and the diameter is 4 cm;
s2: after the heavy metal adsorption rod is inserted, a clean water source is poured into the restored farmland, when the surface layer of the farmland is soaked into the farmland, the clean water source is poured into the farmland, the operation is repeated, the clean water source is kept to be 1-2 cm higher than the soil on the surface layer of the farmland, and the operation is kept for 12 d;
s3: draining residual water in the farmland, uniformly throwing lime powder into the farmland when a 10-20 cm soil layer of the farmland falls dry, wherein the addition amount of the lime powder is 110 kg/mu, the throwing speed of the lime powder is controlled at 4g/min, fully ploughing and mixing, ploughing once every 4d, keeping the ploughing depth at 25-35 cm every time, and continuously ploughing for 20d, thus finishing the restoration of the copper-polluted farmland.
The contrast treatment field water management is consistent with the combined restoration treatment field management measures, and the difference is that the soil in the contrast treatment area is not added with attapulgite and lime.
EXAMPLE III
The basic physicochemical properties of the test soil are as follows: the organic matter is 20.08 g/kg, the total nitrogen is 0.78 g/kg, the alkaline hydrolysis nitrogen is 53.3 mg/kg, the available phosphorus is 28.3 mg/kg, and the quick-acting potassium is 134 mg/kg; the effective copper content in the soil is 176.2mg/kg, the selected area of the test field is about 2 mu, the treatment is divided into 2 treatments of contrast and combined restoration, and 4 times of treatment are set for each treatment.
The combined remediation is carried out by using the copper-polluted farmland stabilization-field management and control combined remediation method provided by the invention, and the specific operation steps are as follows:
s1: ploughing a farmland to be restored, stripping stones and weeds from the farmland, leveling soil on the surface of the farmland, inserting heavy metal adsorption rods into the soil, wherein the distance between every two adjacent heavy metal adsorption rods is 25cm, the heavy metal adsorption rods are made of attapulgite, and the specific surface area of the attapulgite is 160m2The content of attapulgite in the attapulgite is more than 75%, and the size of the heavy metal adsorption rod is as follows: the length is 40cm, and the diameter is 5 cm;
s2: after the heavy metal adsorption rod is inserted, a clean water source is poured into the restored farmland, when the surface layer of the farmland is soaked into the farmland, the clean water source is poured into the farmland, the operation is repeated, the clean water source is kept to be 1-2 cm higher than the soil on the surface layer of the farmland, and the operation is kept for 10 days;
s3: draining residual water in the farmland, uniformly throwing lime powder into the farmland when a 10-20 cm soil layer of the farmland falls dry, wherein the addition amount of the lime powder is 130 kg/mu, the throwing speed of the lime powder is controlled at 5g/min, fully ploughing and mixing, ploughing once every 4d, keeping the ploughing depth at 25-35 cm every time, and continuously ploughing for 22d, thus completing the restoration of the copper-polluted farmland.
The contrast treatment field water management is consistent with the combined restoration treatment field management measures, and the difference is that the soil in the contrast treatment area is not added with attapulgite and lime.
Example four
The basic physicochemical properties of the test soil are as follows: the organic matter is 20.47 g/kg, the total nitrogen is 0.79g/kg, the alkaline hydrolysis nitrogen is 51.5mg/kg, the available phosphorus is 31.0 mg/kg, and the quick-acting potassium is 143 mg/kg; the effective copper content in the soil is 191.3mg/kg, the selected area of the test field is about 2 mu, the treatment is divided into 2 treatments of contrast and combined restoration, and 4 times of treatment are set for each treatment.
The combined remediation is carried out by using the copper-polluted farmland stabilization-field management and control combined remediation method provided by the invention, and the specific operation steps are as follows:
s1: ploughing a farmland to be restored, stripping stones and weeds from the farmland, leveling soil on the surface of the farmland, inserting heavy metal adsorption rods into the soil, wherein the distance between every two adjacent heavy metal adsorption rods is 20cm, the heavy metal adsorption rods are made of attapulgite, and the specific surface area of the attapulgite is 160m2The content of attapulgite in the attapulgite is more than 75%, and the size of the heavy metal adsorption rod is as follows: the length is 40cm, and the diameter is 4 cm;
s2: after the heavy metal adsorption rod is inserted, a clean water source is poured into the restored farmland, when the surface layer of the farmland is soaked into the farmland, the clean water source is poured into the farmland, the operation is repeated, the clean water source is kept to be 1-2 cm higher than the soil on the surface layer of the farmland, and the operation is kept for 8 days;
s3: draining residual water in the farmland, uniformly throwing lime powder into the farmland when a 10-20 cm soil layer of the farmland falls dry, wherein the addition amount of the lime powder is 120 kg/mu, the throwing speed of the lime powder is controlled at 5g/min, fully ploughing and mixing, ploughing once every 3d, keeping the ploughing depth at 25-35 cm every time, and continuously ploughing for 18d, thus completing the restoration of the copper-polluted farmland.
The contrast treatment field water management is consistent with the combined restoration treatment field management measures, and the difference is that the soil in the contrast treatment area is not added with attapulgite and lime.
In summary, the control treatment field moisture management measures in the first to fourth embodiments of the present invention are consistent with the combined remediation treatment field management measures, and the difference is that the soil in the control treatment area is not added with attapulgite and lime.
After the combined restoration treatment is finished, the parallel repeated treatment areas in the first embodiment and the second embodiment are respectively sampled, the sampling mode is that the soil diagonal lines in the single treatment single repeated area are sampled and then mixed into a mixed parallel sample, namely, 4 mixed parallel samples are collected in each treatment. Respectively measuring the content of effective copper in each soil sample, taking the average value of the results, and counting as follows:
according to the detection result, the effective copper content is obviously reduced by adopting the repairing method designed by the invention, the stabilizing efficiency can reach 63.1 percent at most and is obviously higher than the stabilizing efficiency of the contrast treatment by 20.6 percent. Therefore, the method can remarkably reduce the content of effective copper in the polluted farmland soil by carrying out stabilization treatment on the adsorption and fixation material and combining the traditional farmland management and control measures of the farmland, effectively controls the migration way of the heavy metal in the soil absorbed and enriched by plants, and expands the new direction of restoring the heavy metal polluted farmland soil.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (3)
1. A copper-polluted farmland stabilization-field management and control combined remediation method is characterized by comprising the following steps:
s1: ploughing a farmland to be restored, stripping stones and weeds from the farmland, leveling soil on the surface of the farmland, inserting heavy metal adsorption rods with the length of 35-45 cm and the diameter of 4-6 cm into the soil, and enabling the distance between every two adjacent heavy metal adsorption rods to be 20-25 cm;
s2: after the heavy metal adsorption rod is inserted, a clean water source is poured into the restored farmland, when the surface layer of the farmland is soaked into the farmland, the clean water source is poured into the farmland, the operation is repeated, and the submerged state is kept for 8-12 d;
s3: draining residual water in the farmland, uniformly throwing lime powder to the farmland according to the addition of 110-130 kg/mu and at a speed of 3-5 g/min after a 10-20 cm soil layer of the farmland is dried, fully ploughing and mixing, ploughing once every 3-5 d, keeping the ploughing depth at 25-35 cm every time, and continuously ploughing for 18-22 d, namely finishing the restoration of the combination of copper pollution farmland stabilization and field management and control.
2. The combined remediation method of farmland stabilization and field management and control polluted by copper according to claim 1, characterized in that the heavy metal adsorption rod is made of attapulgite.
3. The combined remediation method for the farmland with copper pollution and the field control as claimed in claim 2, wherein the attapulgite has a specific surface area of 150-180 m2The content of the attapulgite in the attapulgite is more than 75 percent.
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| CN110773561A (en) * | 2019-11-25 | 2020-02-11 | 苏州中晟环境修复股份有限公司 | Leaching and curing combined remediation method for soil polluted by circuit board etching solution |
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