CN112090950A - Paddy field heavy metal pollution remediation material and processing method and remediation method thereof - Google Patents
Paddy field heavy metal pollution remediation material and processing method and remediation method thereof Download PDFInfo
- Publication number
- CN112090950A CN112090950A CN202010840188.6A CN202010840188A CN112090950A CN 112090950 A CN112090950 A CN 112090950A CN 202010840188 A CN202010840188 A CN 202010840188A CN 112090950 A CN112090950 A CN 112090950A
- Authority
- CN
- China
- Prior art keywords
- heavy metal
- paddy field
- metal pollution
- inner core
- remediation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
Abstract
The invention relates to the technical field of farmland heavy metal pollution remediation, in particular to a paddy field heavy metal pollution remediation material and a processing method and a remediation method thereof, wherein the paddy field heavy metal pollution remediation material sequentially comprises an inner core, an inner mesh bag coated outside the inner core and an outer mesh cover detachably coated outside the inner mesh bag from inside to outside, and the inner core is a granular material prepared from the following raw materials in percentage by weight: 30-40% of humic acid, 20-25% of biochar, 15-20% of palygorskite, 10-15% of montmorillonite and 10-15% of steel slag; by adopting the repairing material, the repairing material can be conveniently taken out of the soil after repairing, compared with the traditional in-situ passivation repairing material, the repairing material can not cause soil hardening and fertility reduction, can really reduce the content of heavy metal in the soil, and has no risk of secondary release.
Description
Technical Field
The invention relates to the technical field of farmland heavy metal pollution remediation, in particular to a paddy field heavy metal pollution remediation material and a processing method and a remediation method thereof.
Background
With the rapid progress of industry, the solution of environmental pollution problem becomes more and more reluctant. Among them, heavy metal pollution is a difficult problem concerning human and environmental health and survival to be treated urgently. Heavy metals are finally ingested by human beings through the food chain under the action of biological enrichment in the environment, and have long-term and potential harm to human health. Therefore, compared with the heavy metal pollution of the field, the heavy metal pollution of the farmland has more direct and profound influence on human health.
China is a big agricultural country, rice is one of the most important food crops in China, and rice is staple food of Chinese all the time. The planting area of Chinese rice is less than 30% of the total planting area of grain crops, but the rice yield accounts for about 40% of the total grain yield. The sources of heavy metal pollution of the paddy field mainly include industrial sewage irrigation, illegal accumulation and discharge of industrial waste residues and waste gases, agricultural production, large-scale application of organic fertilizers and chemical fertilizers with excessive heavy metals and the like. The paddy field polluted by the heavy metal can grow rice rich in the heavy metal, and the rice finally accumulates in human bodies through food chains, so that the human health is seriously harmed. Therefore, the control of heavy metal pollution in paddy fields is not slow.
The main remediation methods for the heavy metal pollution of the soil comprise: physical remediation methods, including deep ploughing, soil-moving, surface soil-removing, soil-changing, etc.; chemical methods, including electrokinetic remediation, chemical leaching, and solidification stabilization techniques; bioremediation methods include hyperaccumulation phytoremediation and microbial remediation. Wherein, the farmland heavy metal restoration is usually carried out by a chemical method, namely, a chemical modifier, a passivator and the like are added for in-situ curing restoration. However, the application of the heavy metal passivator only changes the form of the heavy metal, the heavy metal is not really removed from the soil, and the risk of secondary release exists. In addition, excessive addition of the traditional inorganic passivator can cause soil hardening and salinization.
The invention discloses a passivating agent for repairing heavy metal cadmium pollution of farmlands and a using method thereof, which are disclosed by Chinese invention patent with application publication number of CN 109294588A. The method belongs to traditional in-situ passivation repair, and although the content of heavy metals in soil can be reduced within a certain period of time, the total amount of the heavy metals in the soil is not changed, and the risk of secondary release of the heavy metals exists. In addition, the main adsorbing material in the composite passivator is a chemical synthesis adsorbing material, soil hardening and salinization are easily caused after the composite passivator is applied to farmlands, and the fertility of the soil is reduced.
The invention discloses a preparation method of a heavy metal soil remediation material for a paddy field based on biochar blended fertilizer, and the preparation method is characterized in that the restoration material with the fertility effect is prepared by blending multi-crack biochar with a microbial preparation and a chemical fertilizer, so that heavy metal in soil is adsorbed, the effect of reducing the effective state content of the heavy metal is achieved to a certain extent, and the soil is not hardened and the fertility is reduced. However, the repair material still belongs to the traditional in-situ passivation repair material, and the heavy metal content in the soil cannot be reduced fundamentally.
Disclosure of Invention
The first purpose of the invention is to provide a paddy field heavy metal pollution repair material, which does not cause soil hardening and fertility reduction compared with the traditional in-situ passivation repair material, and can really reduce the heavy metal content in soil without risk of secondary release.
The second purpose of the invention is to provide a processing method of the paddy field heavy metal pollution repair material, which is characterized in that the inner core is arranged in an inner mesh bag, the inner mesh bag is detachably sleeved in an outer mesh cover, and thus the paddy field heavy metal pollution repair material capable of taking the whole inner core out of soil is obtained through processing.
The third purpose of the invention is to provide a method for repairing the heavy metal pollution repairing material in the paddy field, wherein the inner mesh bag and the inner core are integrally taken out from the outer mesh cover after the repairing is finished, so that the true heavy metal pollution repairing is realized, and the risk of secondary release is avoided.
The first purpose of the invention is realized by the following technical scheme:
the utility model provides a paddy field heavy metal pollution repair material, its from interior to exterior includes in proper order that inner core, cladding are at the outside interior pocket of inner core and can dismantle the outside outer wire gauze of cladding at the inside pocket outside, the inner core is the granular material who is prepared by the raw materials of following weight percentage content: 30-40% of humic acid, 20-25% of biochar, 15-20% of palygorskite, 10-15% of montmorillonite and 10-15% of steel slag.
By adopting the technical scheme, the humic acid is extracted from animal and plant remains in nature, and has the advantages of rich resources, large reserve, wide distribution and good grade; humic acid has rich active functional groups, can be combined with heavy metals in various forms to become a soil heavy metal passivator, and influences the morphological transformation, mobility and biological effectiveness of the heavy metals in soil. The biochar has larger porosity and specific surface area, has a large amount of negative charges on the surface and higher charge density, can adsorb a large amount of exchangeable cations, and is a good adsorbing material; meanwhile, the biochar contains rich soil nutrient elements such as N, P, K, Ca, Mg and trace elements, and can restore heavy metal pollution, increase soil organic matters and improve soil fertility after being applied to farmlands. In addition, the humic acid can remarkably promote the adsorption of the biological carbon on the heavy metals, improve the adsorption quantity and shorten the adsorption balance time; humic acid and charcoal have synergistic effect, and can promote the adsorption of heavy metals by the repair material. Palygorskite and montmorillonite belong to clay minerals, are a kind of natural non-metallic mineral widely distributed in nature, the structural layer has charges, the specific surface area is larger, the concentration and activity of heavy metal ions in soil are reduced through the actions of adsorption, coordination reaction, coprecipitation reaction and the like, and the purpose of passivation repair is achieved; unlike other chemical synthetic adsorbing materials, clay mineral has the advantages of in-situ property, low cost, quick effect, difficulty in changing soil structure, no damage to soil ecological environment and the like. In addition, the palygorskite and the montmorillonite have higher plasticity and cohesive force, and are more beneficial to compounding all the raw materials of the inner core to form inner core particles, so that the repair effect of the inner core is improved.
In the invention, the inner core is coated by the inner and outer mesh covers, and heavy metals in soil can be absorbed by the inner core material through the inner and outer mesh covers; after adsorption is completed, the whole repairing material is taken out of the rice field, the outer mesh cover is detached, and the inner mesh bag and the inner core in the inner mesh bag are integrally replaced, so that heavy metal in soil can be removed. Compared with the traditional in-situ passivation repairing method, the method can really reduce the content of heavy metals in the soil and reduce the risk of secondary release of the heavy metals.
Preferably, the inner mesh bag is formed by enclosing biodegradable non-woven fabrics and is provided with a cavity for accommodating the inner core particle material.
Through adopting above-mentioned technical scheme, but interior pocket adopts biodegradable non-woven fabrics, and the environmental protection is pollution-free to can satisfy the demand of permeating water, breathing freely, passing through metal ion.
Preferably, the cavity has a thickness of no more than 5cm, a height of no more than 10cm and a length of no more than 1 m.
Through adopting above-mentioned technical scheme, set for the size of cavity, make inner core particulate material can be in the state of opening out of preferred in the cavity, increase inner core particulate material and heavy metal ion's effective area of contact, improve the restoration effect.
Preferably, the mesh aperture of the outer net cover is 3-5 cm.
By adopting the technical scheme, the outer net cover mainly plays a role in coating and supporting the inner net bag and the inner core particle material, and the aperture of the net holes is set, so that the good ion permeability is ensured.
Preferably, the outer mesh enclosure is made of a corrosion-resistant plastic mesh.
By adopting the technical scheme, the corrosion-resistant plastic net has excellent chemical resistance, can be repeatedly used after being applied to the repair material, and is energy-saving and environment-friendly.
Preferably, the inner core particle material is prepared by the following operation steps:
(1) mixing humic acid, biochar, palygorskite, montmorillonite and steel slag, stirring, controlling the rotating speed at 40-60r/min, and stirring for 50-70min to obtain a mixture A;
(2) pouring the mixture A into a double-screw granulator, controlling the water content to be 15-20%, and preparing into granules with the diameter of 2-5 mm;
(3) drying the granules at 50-60 deg.C for 1-2h to obtain the core granule material.
The second purpose of the invention is realized by the following technical scheme:
a processing method of a paddy field heavy metal pollution remediation material is obtained by the following steps:
1) sewing the inner mesh bag;
2) filling the inner core particle material into an inner mesh bag, and sewing the end opening;
3) and integrally coating the inner mesh bag filled with the inner core particle material by using an outer mesh cover to obtain the composite material.
By adopting the technical scheme, the repairing material disclosed by the invention is simple to process and operate, complex mechanical processing equipment is not required, the repairing material can be finished by sewing, and the processing material is easy to obtain and is easy to popularize.
The third purpose of the invention is realized by the following technical scheme:
a method for repairing a heavy metal pollution repairing material in a paddy field comprises the following repairing steps:
irrigating the paddy field, keeping the water depth at 10-20cm, and carrying out rotary tillage and mixing;
fixing the heavy metal pollution remediation material in the paddy field by using a support piece, and keeping the height direction of the inner mesh bag vertical to the paddy field and completely submerged in water;
internally circulating the water in the paddy field at a frequency of at least 2 times/day, and restoring for one week;
taking out the heavy metal pollution remediation material in the paddy field, and detecting the heavy metal content in the soil in the paddy field;
if the heavy metal content is reduced to be stable, completing the restoration; if the heavy metal content is still decreasing, the above operation is repeated until the heavy metal content is decreased to be stable.
By adopting the technical scheme, after the paddy field is irrigated, rotary tillage is firstly carried out, so that the effective heavy metals in the paddy field are precipitated into water to the maximum extent; the height direction of the inner mesh bag is vertical to the paddy field and is completely submerged in water, so that the repairing material and the paddy field are irrigated with water to have a larger effective contact area; the effective heavy metal irrigated in the paddy field is absorbed by the remediation material to the maximum extent through daily water circulation treatment. After the restoration is accomplished at every turn, take out paddy field heavy metal pollution repair materials, pull down outer screen panel from interior pocket, change interior pocket and inner core, realized really getting rid of to the interior heavy metal of paddy field.
Preferably, a plurality of sections of the paddy field heavy metal pollution remediation materials are fixed on each support piece from top to bottom in sequence.
By adopting the technical scheme, the effective contact area of the repairing material and metal ions in the paddy field is increased as much as possible, and the repairing effect is improved.
Preferably, 13t-20t are applied per acre per week, calculated on the basis of the inner core particle material.
In conclusion, the invention has the following beneficial effects:
(1) by adopting the paddy field heavy metal pollution remediation material and the corresponding remediation method, the heavy metal in the paddy field can be subjected to in-situ remediation, and the remediation material is taken out after remediation, so that the heavy metal pollution in the soil can be remedied in a real sense, secondary release pollution cannot be generated, and the safety is higher;
(2) the removal rate of Pb in the paddy field reaches 53.36%, the removal rate of Cd in the paddy field reaches 80.77%, the removal rate of Cr in the paddy field reaches 65.85%, the removal rate of Cu in the paddy field reaches 72.47%, the removal rate of Zn in the paddy field reaches 61.54%, and heavy metals in soil can be effectively removed;
(3) by adopting the paddy field heavy metal pollution remediation material and the remediation method, the pH and the salt content of the paddy field soil are hardly influenced, the soil hardening and salinization cannot be caused, and the fertility of the soil cannot be damaged;
(4) the invention has wide source of raw materials, low price and easy obtainment and has good popularization and application prospect in the heavy metal pollution treatment of the paddy field.
Detailed Description
The present invention will be further described with reference to the following specific examples.
The following raw materials and materials in the invention are all commercially available products, and specifically comprise: humic acid is selected from Henxing science and technology Limited of Lingshi county; the palygorskite is selected from Kunming Bairuis science and technology, Inc.; montmorillonite is selected from Kunming Bairuis science and technology, Inc.; the steel slag is selected from Kunming Bairuis science and technology limited company, and the main material phases comprise black tourmaline, dolomite and quartz; the inner mesh bag is made of biodegradable non-woven fabric selected from polylactic acid non-woven fabric or polypropylene resin non-woven fabric, and other commercially available biodegradable non-woven fabric can also be adopted; the raw material of the outer net cover is selected from PP or PE corrosion-resistant plastic nets, and other commercially available corrosion-resistant plastic nets can also be selected.
Preparation example 1
The biochar is prepared by the following operations:
taking 100kg of rice straw, 100kg of corn straw and 100kg of wheat straw, drying for 2 hours at 70 ℃, then crushing by using a crusher, and sieving by using a 200-mesh sieve to obtain powdery straw; and pyrolyzing for 4 hours at 600 ℃ under the condition of anaerobic reaction to obtain the biochar.
Preparation example 2
The inner core particle material of preparation example 2 of the present invention was prepared by the following operation steps:
(1) pretreatment of raw materials: sieving humic acid with 100 mesh sieve, and screening for later use; crushing palygorskite, montmorillonite and steel slag by a crusher, and sieving by a 80-mesh sieve for later use;
(2) according to the mixing amount shown in the table 1, humic acid, biochar, palygorskite, montmorillonite and steel slag are weighed and added into a stirrer to be stirred and mixed, the rotating speed is controlled to be 40r/min, and stirring is carried out for 70min, so as to obtain a mixture A;
(2) pouring the mixture A into a double-screw granulator, controlling the water content to be 15%, and preparing into particles of 2-5 mm;
(3) and drying the granules at 50 ℃ for 2h to obtain the inner core granular material.
Preparation example 3
The core particle material of preparation example 3 was prepared by the following procedure:
(1) pretreatment of raw materials: sieving humic acid with 100 mesh sieve, and screening for later use; crushing palygorskite, montmorillonite and steel slag by a crusher, and sieving by a 80-mesh sieve for later use;
(2) according to the mixing amount shown in the table 1, humic acid, biochar, palygorskite, montmorillonite and steel slag are weighed and added into a stirrer to be stirred and mixed, the rotating speed is controlled to be 50r/min, and the stirring is carried out for 60min, so as to obtain a mixture A;
(2) pouring the mixture A into a double-screw granulator, controlling the water content to be 18%, and preparing into granules with the diameter of 2-5 mm;
(3) and drying the particles for 1.5h at 55 ℃ to obtain the inner core particle material.
Preparation example 4
The core particle material of preparation example 4 was prepared by the following procedure:
(1) pretreatment of raw materials: sieving humic acid with 100 mesh sieve, and screening for later use; crushing palygorskite, montmorillonite and steel slag by a crusher, and sieving by a 80-mesh sieve for later use;
(2) according to the mixing amount shown in the table 1, humic acid, biochar, palygorskite, montmorillonite and steel slag are weighed and added into a stirrer to be stirred and mixed, the rotating speed is controlled to be 60r/min, and the stirring is carried out for 50min, so as to obtain a mixture A;
(2) pouring the mixture A into a double-screw granulator, controlling the water content to be 20%, and preparing into granules with the diameter of 2-5 mm;
(3) and drying the granules at 60 ℃ for 1h to obtain the inner core granular material.
Preparation examples 5 to 10
The core particle materials of preparation examples 5 to 10 were prepared in the same manner as in preparation example 3 except that the blending amounts of the respective raw materials were different, as shown in table 1, and the rest were the same as in preparation example 3.
TABLE 1 blending amounts (unit: kg) of raw materials for core particle materials of preparation examples 2 to 10
| Preparation examples 2 to 4 | Preparation example 5 | Preparation example 6 | Preparation example 7 | Preparation example 8 | Preparation example 9 | Preparation example 10 | |
| Humic acid | 30 | 30 | 30 | 35 | 40 | 35 | 35 |
| Biochar | 25 | 25 | 25 | 25 | 25 | 20 | 23 |
| Palygorskite | 15 | 18 | 20 | 20 | 15 | 18 | 18 |
| Montmorillonite (montmorillonite) | 15 | 13.5 | 12.5 | 10 | 10 | 13.5 | 12 |
| Steel slag | 15 | 13.5 | 12.5 | 10 | 10 | 13.5 | 12 |
Example 1
A paddy field heavy metal pollution remediation material is processed by the following steps:
1) sewing the inner mesh bag: taking a rectangular polypropylene resin non-woven fabric, folding the polypropylene resin non-woven fabric in half, and sewing two edges in the length direction by using a non-woven fabric suture to obtain an inner mesh bag with an opening at one end and a cavity for containing the inner core particle material; wherein the cavity has a thickness of 5cm, a height of 10cm and a length of 1 m;
2) taking 10kg of the inner core particle material prepared in the preparation example 2, filling the inner mesh bag, and sewing the end opening of the inner mesh bag;
3) the inner mesh bag filled with the inner core particle materials is integrally coated by a PE corrosion-resistant plastic mesh with the mesh aperture of 5cm, the inner mesh bag and the corrosion-resistant plastic mesh are fixed by sewing with a non-woven fabric suture, so that the corrosion-resistant plastic mesh forms an outer mesh cover, the inner mesh bag and the inner core particle materials in the inner mesh bag play a supporting role, and finally the paddy field heavy metal pollution repairing material is obtained.
Example 2
A paddy field heavy metal pollution remediation material is processed by the following steps:
1) sewing the inner mesh bag: taking a rectangular polylactic acid non-woven fabric, folding the rectangular polylactic acid non-woven fabric in half, and sewing two edges in the length direction by using a non-woven fabric suture to obtain an inner mesh bag with an opening at one end and a cavity for containing the inner core particle material; wherein the cavity has a thickness of 4cm, a height of 8cm and a length of 0.7 m;
2) taking 10kg of the inner core particle material prepared in the preparation example 2, filling the inner mesh bag, and sewing the end opening of the inner mesh bag;
3) the inner mesh bag filled with the inner core particle material is integrally coated by a PP (polypropylene) corrosion-resistant plastic mesh with the mesh aperture of 4cm, the inner mesh bag and the corrosion-resistant plastic mesh are fixed by sewing with a non-woven fabric suture, so that the corrosion-resistant plastic mesh forms an outer mesh cover, the inner mesh bag and the inner core particle material in the inner mesh bag play a supporting role, and finally the paddy field heavy metal pollution repairing material is obtained.
Example 3
A paddy field heavy metal pollution remediation material is processed by the following steps:
1) sewing the inner mesh bag: taking a rectangular polylactic acid non-woven fabric, folding the rectangular polylactic acid non-woven fabric in half, and sewing two edges in the length direction by using a non-woven fabric suture to obtain an inner mesh bag with an opening at one end and a cavity for containing the inner core particle material; wherein the cavity has a thickness of 5cm, a height of 5cm and a length of 0.5 m;
2) taking 10kg of the inner core particle material prepared in the preparation example 2, filling the inner mesh bag, and sewing the end opening of the inner mesh bag;
3) the inner mesh bag filled with the inner core particle material is integrally coated by a PP (polypropylene) corrosion-resistant plastic mesh with the mesh aperture of 3cm, the inner mesh bag and the corrosion-resistant plastic mesh are fixed by sewing with a non-woven fabric suture, so that the corrosion-resistant plastic mesh forms an outer mesh cover, the inner mesh bag and the inner core particle material in the inner mesh bag play a supporting role, and finally the paddy field heavy metal pollution repairing material is obtained.
Examples 4 to 11
The paddy field heavy metal pollution remediation materials of examples 4 to 11 were completely the same as those of example 2 except that the core particle materials prepared in preparation examples 3 to 10 were used as the core particle materials, respectively.
It should be noted that, when the repairing material of the present invention is processed, two connected inner mesh bags can be directly sewn when the inner mesh bag is sewn according to actual conditions. For example, when two sections of repair materials need to be fixed up and down according to the water depth of irrigation and the size of the cavity of the inner mesh bag, the following operations are adopted when the inner mesh bag is sewn: taking a rectangular polylactic acid non-woven fabric, folding the rectangular polylactic acid non-woven fabric in half, and sewing two edges in the length direction by using a non-woven fabric suture to obtain an inner mesh bag with an opening at one end and a cavity for containing the inner core particle material; after filling the inner core particle material with the height consistent with the cavity height of the single inner mesh bag, sewing the section; then continuously filling the inner core particle material until the height of the inner core particle material is consistent with that of the inner mesh bag cavity, and sewing the port to obtain the two-section conjoined repairing material.
Comparative example 1
The paddy field heavy metal pollution remediation material of comparative example 1 was completely the same as the processing operation of example 2, except that in the core particle material, humic acid was replaced with equal mass of sand of the same particle size, and the rest was the same as in example 2.
Comparative example 2
The paddy field heavy metal pollution remediation material of comparative example 2 was completely the same as the processing operation of example 2, except that in the inner core particle material, biochar was replaced with equal mass of sand of the same particle size, and the rest was the same as in example 2.
Comparative example 3
The paddy field heavy metal pollution remediation material of comparative example 3 was identical to the processing operation of example 2, except that in the core particle material, palygorskite and montmorillonite were replaced with equal-mass sandstone with the same particle size, and the rest was identical to that of example 2.
15 mu of test field of the town of the old city of Yunnan province is selected and divided into fifteen areas on average. And (3) respectively repairing the heavy metal pollution in each area, wherein the specific repairing method is detailed in each application example and application comparative example.
Application example 1
The paddy field heavy metal pollution remediation material of example 2 is applied to remediation of soil heavy metal pollution in a paddy field of the first area, and the concrete remediation steps are as follows:
before planting rice, irrigating water into the rice field, and keeping the water depth at 10 cm; rotary tillage and mixing by a rotary cultivator;
use the bamboo pole as support piece, be fixed in the paddy field heavy metal pollution repair material with the paddy field, specifically do: every two bamboo poles are taken as a group, the upper end and the lower end of the outer net cover in the height direction are fixed on the bamboo poles by using corrosion-resistant plastic binding ropes, and a section of paddy field heavy metal pollution remediation material is fixed on each group of bamboo poles; the height direction of the inner mesh bag is vertical to the plane of the paddy field and is completely immersed in water; setting the proper interval between each group of bamboo poles, and applying 13t of the bamboo poles in the amount of inner core particle materials per mu of land;
internally circulating the water in the paddy field by a circulating water pump at the frequency of 2 times/day, repeating the steps and repairing for 7 days;
and (3) taking out all the heavy metal pollution repairing materials of the paddy field, taking the soil in the area, and detecting the content of heavy metals in the soil, wherein the content of each heavy metal is reduced to be stable as shown in table 2, so that the repairing is completed.
Application example 2
The paddy field heavy metal pollution remediation material of example 3 is applied to the soil heavy metal pollution remediation of the paddy field in the second area, and the concrete remediation steps are as follows:
before planting the rice, irrigating the rice field with water, and keeping the water depth at 13 cm; rotary tillage and mixing by a rotary cultivator;
use the bamboo pole as support piece, be fixed in the paddy field heavy metal pollution repair material with the paddy field, specifically do: every two bamboo poles are taken as a group, the upper end and the lower end of the outer net cover in the height direction are fixed on the bamboo poles by using corrosion-resistant plastic binding ropes, and two sections of paddy field heavy metal pollution repairing materials are fixed on each group of bamboo poles; the height direction of the inner mesh bag is vertical to the plane of the paddy field and is completely immersed in water; setting the proper interval between each group of bamboo poles, and applying 13t of the bamboo poles in the amount of inner core particle materials per mu of land;
internally circulating the water in the paddy field by a circulating water pump at the frequency of 2 times/day, repeating the steps and repairing for 7 days;
and (3) taking out all the heavy metal pollution repairing materials of the paddy field, taking the soil in the area, and detecting the content of heavy metals in the soil, wherein the content of each heavy metal is reduced to be stable as shown in table 2, so that the repairing is completed.
Application example 3
The paddy field heavy metal pollution remediation material of example 1 is applied to the soil heavy metal pollution remediation of the paddy field of the third area, and the concrete remediation steps are as follows:
before planting the rice, irrigating the rice field with water, and keeping the water depth at 20 cm; rotary tillage and mixing by a rotary cultivator;
use the bamboo pole as support piece, be fixed in the paddy field heavy metal pollution repair material with the paddy field, specifically do: every two bamboo poles are taken as a group, the upper end and the lower end of the outer net cover in the height direction are fixed on the bamboo poles by using corrosion-resistant plastic binding ropes, and two sections of paddy field heavy metal pollution repairing materials are fixed on each group of bamboo poles; the height direction of the inner mesh bag is vertical to the plane of the paddy field and is completely immersed in water; setting the proper interval between each group of bamboo poles, and applying 13t of the bamboo poles in the amount of inner core particle materials per mu of land;
internally circulating the water in the paddy field by a circulating water pump at the frequency of 2 times/day, repeating the steps and repairing for 7 days;
and (3) taking out all the heavy metal pollution repairing materials of the paddy field, taking the soil in the area, and detecting the content of heavy metals in the soil, wherein the content of each heavy metal is reduced to be stable as shown in table 2, so that the repairing is completed.
Application examples 4 to 11
Application examples 4 to 11 are respectively the remediation of heavy metal pollution of soil in paddy fields from four to eleven areas, the specific remediation steps are the same as the operation of application example 2, and the rest are the same as in application example 2 except that the heavy metal pollution remediation materials are respectively adopted in examples 4 to 11.
Application of comparative examples 1 to 3
The application comparative examples 1 to 3 are respectively the remediation of the heavy metal pollution of the soil in the paddy fields of twelve to fourteen areas, the concrete remediation steps are the same as the operation of the application example 2, and the rest are the same as the application example 2 except that the heavy metal pollution remediation materials are respectively the comparative examples 1 to 3.
Blank control group
The paddy field of area fifteen was treated with the following procedure:
before planting the rice, irrigating the rice field with water, and keeping the water depth at 13 cm; rotary tillage and mixing by a rotary cultivator; internally circulating the water in the paddy field by a circulating water pump at the frequency of 2 times/day, repeating the steps and repairing for 7 days;
the heavy metal content of the soil in the paddy field after the remediation was detected, and is specifically shown in table 2.
Detecting the content of effective barrier and lead in the soil by adopting a GB/T23739-2009 assay method;
the contents of copper, zinc and chromium in the soil were determined by the assay method of HJ 491-2019, and the specific results are shown in Table 2.
TABLE 2 heavy metal content (in mg/kg) in soil after remediation in different test areas
From the detection results in table 2, it can be seen that the paddy field heavy metal pollution remediation material of the present invention, in combination with a corresponding remediation method, can perform in-situ remediation of heavy metals in a paddy field, and the remediation material is taken out after remediation, thereby truly realizing remediation of heavy metal pollution in soil, and having no secondary release pollution and higher safety; after the repairing for 4 weeks, the heavy metal content in the soil reaches a basically stable state, wherein the maximum removal rate of Pb in an effective state in the paddy field reaches 59.80%, the maximum removal rate of Cd in the effective state reaches 75.51%, the maximum removal rate of Cr in the effective state reaches 72.49%, the maximum removal rate of Cu in the effective state reaches 55.11%, and the maximum removal rate of Zn in the effective state reaches 40.85%. The detection results of the application comparative examples 1-3 show that in the inner core particle material, humic acid, biochar, palygorskite and montmorillonite have great influence on the removal rate of heavy metals of the repair material.
Another test field of 3 mu in the town of old city of Yunnan province is selected and divided into two areas on average. Respectively repairing the heavy metal pollution of the two areas by adopting the repairing material and the repairing method of the application example 11 and the blank control group; in the repairing process, the repairing material amount adopted in each period is as follows: applying 20t per mu of land by using the inner core particle material; the repair results are detailed in table 3.
In the two areas, soil samples are respectively taken before restoration, after 3 weeks of restoration and after 5 weeks of restoration, and the pH value of the soil is detected by adopting a stone test paper colorimetric method. The method comprises the following steps of: weighing 20g of air-dried soil, placing the air-dried soil in a beaker, adding 100mL of distilled water, stirring for 3min, and immediately filtering; sucking 50mL of filtrate, putting the filtrate into a dried and weighed small beaker with the volume of 100mL, and evaporating the filtrate in a water bath; treating with 15% hydrogen peroxide solution, heating in water bath, and removing organic substances; wiping the outside of the small beaker by using a filter paper sheet, putting the small beaker into a 100 ℃ oven to be dried for 4 hours, then moving the small beaker into a drier to be cooled to room temperature, and weighing the small beaker by using an analytical balance; and (3) continuously putting the weighed drying residue into an oven to be dried for 2 hours, and weighing until the weight is constant (namely the weight difference between the two times is less than 0.0003 g). The results are shown in Table 4.
TABLE 3 repairing Effect of application example 11 and blank control
From the detection results in table 3, it can be seen that the heavy metal content in the soil reaches a substantially stable state after 5 weeks of remediation of another test field by the paddy field heavy metal pollution remediation material of the present invention in combination with a corresponding remediation method; the removal rate of Pb in the paddy field reaches 53.36%, the removal rate of Cd in the paddy field reaches 80.77%, the removal rate of Cr in the paddy field reaches 65.85%, the removal rate of Cu in the paddy field reaches 72.47%, the removal rate of Zn in the paddy field reaches 61.54%, and heavy metals in the soil can be effectively removed.
TABLE 4 soil salinization test results
From the detection results in table 4, it can be seen that the paddy field heavy metal pollution remediation material and the remediation method of the present invention have almost no influence on the pH and salt content of the paddy field soil, do not cause soil hardening and salinization, and do not destroy the fertility of the soil itself.
It is to be noted that the paddy field heavy metal pollution remediation material is mainly applied to soil heavy metal remediation before rice planting; but can also be arranged among the rows of the rice after the rice is transplanted and the seedlings are fixed to carry out the subsequent adsorption on the heavy metals in the soil.
The above-mentioned embodiments are merely illustrative and not restrictive, and those skilled in the art can modify the embodiments without inventive contribution as required after reading this specification, but only fall within the scope of the claims of the present invention.
Claims (10)
1. The utility model provides a paddy field heavy metal pollution repair material which characterized in that, it includes inner core, cladding in the outside interior pocket of inner core and can dismantle the outside outer wire gauze of the outside interior pocket of cladding in proper order from interior to exterior, the inner core is the granular material who is prepared by the raw materials of following weight percentage content: 30-40% of humic acid, 20-25% of biochar, 15-20% of palygorskite, 10-15% of montmorillonite and 10-15% of steel slag.
2. The paddy field heavy metal pollution remediation material of claim 1, wherein: the inner mesh bag is formed by enclosing biodegradable non-woven fabrics and is provided with a cavity for containing inner core particle materials.
3. The paddy field heavy metal pollution remediation material of claim 2, wherein: the thickness of the cavity is not more than 5cm, the height is not more than 10cm, and the length is not more than 1 m.
4. The paddy field heavy metal pollution remediation material of claim 1, wherein: the aperture of the mesh of the outer net cover is 3-5 cm.
5. The paddy field heavy metal pollution remediation material of claim 1, wherein: the outer net cover is made of a corrosion-resistant plastic net.
6. The paddy field heavy metal pollution remediation material of claim 1 wherein the inner core particulate material is prepared by the following steps:
(1) mixing humic acid, biochar, palygorskite, montmorillonite and steel slag, stirring, controlling the rotating speed at 40-60r/min, and stirring for 50-70min to obtain a mixture A;
(2) pouring the mixture A into a double-screw granulator, controlling the water content to be 15-20%, and preparing into granules with the diameter of 2-5 mm;
(3) drying the granules at 50-60 deg.C for 1-2h to obtain the core granule material.
7. A method for processing heavy metal contaminated paddy field restoration materials as claimed in any one of claims 1 to 6, which comprises the steps of:
1) sewing the inner mesh bag;
2) filling the inner core particle material into an inner mesh bag, and sewing the end opening;
3) and integrally coating the inner mesh bag filled with the inner core particle material by using an outer mesh cover to obtain the composite material.
8. The method for remediating a heavy metal contaminated paddy field remediation material as claimed in any one of claims 1 to 6, which comprises the steps of:
irrigating the paddy field, keeping the water depth at 10-20cm, and carrying out rotary tillage and mixing;
fixing the heavy metal pollution remediation material in the paddy field by using a support piece, and keeping the height direction of the inner mesh bag vertical to the paddy field and completely submerged in water;
internally circulating the water in the paddy field at a frequency of at least 2 times/day, and restoring for one week;
taking out the heavy metal pollution remediation material in the paddy field, and detecting the heavy metal content in the soil in the paddy field; if the heavy metal content is reduced to be stable, completing the restoration; if the heavy metal content is still decreasing, the above operation is repeated until the heavy metal content is decreased to be stable.
9. The method for repairing a heavy metal contaminated paddy field according to claim 8, wherein: and a plurality of sections of paddy field heavy metal pollution remediation materials are sequentially fixed on each support piece from top to bottom.
10. The method for repairing a heavy metal contaminated paddy field according to claim 8, wherein: based on the inner core particle material, 13t-20t is applied per mu of land every week.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010446027 | 2020-05-23 | ||
| CN2020104460279 | 2020-05-23 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112090950A true CN112090950A (en) | 2020-12-18 |
Family
ID=73753999
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010840188.6A Pending CN112090950A (en) | 2020-05-23 | 2020-08-19 | Paddy field heavy metal pollution remediation material and processing method and remediation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112090950A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779022A (en) * | 2021-01-15 | 2021-05-11 | 清华大学 | Heavy metal contaminated soil remediation agent and preparation method and application thereof |
| CN113265256A (en) * | 2021-04-16 | 2021-08-17 | 兰州大学 | Soil conditioner and preparation method and application thereof |
| CN114101303A (en) * | 2021-11-26 | 2022-03-01 | 清华大学 | Heavy metal polluted rice field repairing system and method |
| CN114316997A (en) * | 2021-12-18 | 2022-04-12 | 四川大学 | Reagent for circularly repairing cadmium pollution in rice field and preparation method thereof |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011190428A (en) * | 2010-02-17 | 2011-09-29 | Univ Of Tsukuba | Remover composition for heavy metal in soil, and method for removing heavy metal using the same |
| CN104307858A (en) * | 2014-10-30 | 2015-01-28 | 南京农业大学 | Ecological bag for in situ curing and removing of soil heavy mental and application method |
| CN104874601A (en) * | 2015-06-03 | 2015-09-02 | 天津工业大学 | Competitive-adsorption-based in-situ quick restoration method for cadmium-polluted paddy field |
| CN105061114A (en) * | 2015-08-20 | 2015-11-18 | 山东省农业科学院农业资源与环境研究所 | Farmland heavy metal contaminated soil compound modifying agent and preparation method and application method thereof |
| CN205256922U (en) * | 2015-12-22 | 2016-05-25 | 四川农业大学 | Portable food wrapping bag that can nimble dismouting |
| CN105618472A (en) * | 2015-12-22 | 2016-06-01 | 湖南森美思环保有限责任公司 | Method for removing effective-state heavy metal in heavy metal contaminated soil permanently |
| CN106358882A (en) * | 2016-08-31 | 2017-02-01 | 合山市丰鑫农机专业合作社 | Planting method for reducing content of heavy metal chromium in paddy rice |
| CN107398251A (en) * | 2017-07-25 | 2017-11-28 | 华南农业大学 | The preparation and application of the floatability magnetic hollow material removed for water body and heavy metal in soil |
| CN107446588A (en) * | 2017-08-29 | 2017-12-08 | 湖南泰谷生物科技股份有限公司 | Humic acid type acidic soil conditioner and preparation method and application |
| CN110217894A (en) * | 2019-05-23 | 2019-09-10 | 北京博泰至淳生物科技有限公司 | A kind of slow-release solid carbon source for the fully biodegradable that can directly launch and preparation method and application |
| CN209720336U (en) * | 2018-11-28 | 2019-12-03 | 河南中萱网络科技有限公司 | Food pack |
| CN110776360A (en) * | 2019-10-30 | 2020-02-11 | 徐州得铸生物科技有限公司 | Preparation method of paddy field heavy metal soil remediation material based on biochar blended fertilizer |
| CN210175504U (en) * | 2019-06-25 | 2020-03-24 | 韩山师范学院 | Egg shell powder polylactic acid express packaging bag |
| CN111171830A (en) * | 2019-12-18 | 2020-05-19 | 浙江慧丰环保科技有限公司 | Passivator for soil heavy metal pollution treatment and preparation method thereof |
-
2020
- 2020-08-19 CN CN202010840188.6A patent/CN112090950A/en active Pending
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011190428A (en) * | 2010-02-17 | 2011-09-29 | Univ Of Tsukuba | Remover composition for heavy metal in soil, and method for removing heavy metal using the same |
| CN104307858A (en) * | 2014-10-30 | 2015-01-28 | 南京农业大学 | Ecological bag for in situ curing and removing of soil heavy mental and application method |
| CN104874601A (en) * | 2015-06-03 | 2015-09-02 | 天津工业大学 | Competitive-adsorption-based in-situ quick restoration method for cadmium-polluted paddy field |
| CN105061114A (en) * | 2015-08-20 | 2015-11-18 | 山东省农业科学院农业资源与环境研究所 | Farmland heavy metal contaminated soil compound modifying agent and preparation method and application method thereof |
| CN205256922U (en) * | 2015-12-22 | 2016-05-25 | 四川农业大学 | Portable food wrapping bag that can nimble dismouting |
| CN105618472A (en) * | 2015-12-22 | 2016-06-01 | 湖南森美思环保有限责任公司 | Method for removing effective-state heavy metal in heavy metal contaminated soil permanently |
| CN106358882A (en) * | 2016-08-31 | 2017-02-01 | 合山市丰鑫农机专业合作社 | Planting method for reducing content of heavy metal chromium in paddy rice |
| CN107398251A (en) * | 2017-07-25 | 2017-11-28 | 华南农业大学 | The preparation and application of the floatability magnetic hollow material removed for water body and heavy metal in soil |
| CN107446588A (en) * | 2017-08-29 | 2017-12-08 | 湖南泰谷生物科技股份有限公司 | Humic acid type acidic soil conditioner and preparation method and application |
| CN209720336U (en) * | 2018-11-28 | 2019-12-03 | 河南中萱网络科技有限公司 | Food pack |
| CN110217894A (en) * | 2019-05-23 | 2019-09-10 | 北京博泰至淳生物科技有限公司 | A kind of slow-release solid carbon source for the fully biodegradable that can directly launch and preparation method and application |
| CN210175504U (en) * | 2019-06-25 | 2020-03-24 | 韩山师范学院 | Egg shell powder polylactic acid express packaging bag |
| CN110776360A (en) * | 2019-10-30 | 2020-02-11 | 徐州得铸生物科技有限公司 | Preparation method of paddy field heavy metal soil remediation material based on biochar blended fertilizer |
| CN111171830A (en) * | 2019-12-18 | 2020-05-19 | 浙江慧丰环保科技有限公司 | Passivator for soil heavy metal pollution treatment and preparation method thereof |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112779022A (en) * | 2021-01-15 | 2021-05-11 | 清华大学 | Heavy metal contaminated soil remediation agent and preparation method and application thereof |
| CN113265256A (en) * | 2021-04-16 | 2021-08-17 | 兰州大学 | Soil conditioner and preparation method and application thereof |
| CN114101303A (en) * | 2021-11-26 | 2022-03-01 | 清华大学 | Heavy metal polluted rice field repairing system and method |
| CN114316997A (en) * | 2021-12-18 | 2022-04-12 | 四川大学 | Reagent for circularly repairing cadmium pollution in rice field and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN112090950A (en) | Paddy field heavy metal pollution remediation material and processing method and remediation method thereof | |
| CN106216379B (en) | Comprehensive leaching remediation method and system for heavy metal contaminated soil | |
| CN104927870B (en) | soil repairing agent and preparation method and use method thereof | |
| CN109233840B (en) | Composite repairing agent for heavy metal contaminated soil and application thereof | |
| CN113072947B (en) | Stable repairing agent for improving heavy metal soil and preparation method and application thereof | |
| CN106495939A (en) | Heavy metal-polluted soil renovation agent, preparation method and application | |
| CN106147778A (en) | Passivator, preparation method and applications for repairing heavy metal in soil combined pollution | |
| CN109678626B (en) | Soil conditioner for mercury-polluted farmland remediation and preparation method and application thereof | |
| CN105567249A (en) | Chemical repairing agent for farmland soil Cd pollution | |
| CN107311791A (en) | A kind of preparation of environment-friendly type farmland soil heavy metals passivator and its application method | |
| Das et al. | Biochar: A sustainable approach for improving soil health and environment | |
| CN106694541A (en) | Method for repairing heavy metal pollution tailings with charcoal-based slow release fertilizer and imperata cylindrica | |
| CN108178341A (en) | A kind of solid microbe purification particle and preparation method thereof | |
| CN104957009A (en) | Method for regulating turfgrass heavy metal accumulation by using OTC and carbon nano-tube interlayer | |
| CN108262022A (en) | A kind of modification biological charcoal and preparation method thereof | |
| Lei et al. | Remediation of lead polluted soil by active silicate material prepared from coal fly ash | |
| CN106010544A (en) | Reducing aluminum-containing composite heavy metal passivation agent and use method thereof | |
| Al-Sherif et al. | Use of cyanobacteria and organic fertilizer mixture as soil bioremediation | |
| CN112592866A (en) | Carbon-based microbial agent for soil remediation and preparation method and application thereof | |
| CN105969364A (en) | Composite heavy metal passivator containing secondary reduction iron powder and use method of passivator | |
| CN111515236A (en) | In-situ reduction remediation method for cadmium-polluted farmland | |
| CN106433670A (en) | Preparation and application methods for amendment for heavy-metal contaminated soil | |
| CN105855277A (en) | Preparation method of clay mineral material and method for reducing bio-availability of heavy metal in soil and water body | |
| CN107043291B (en) | Method for preparing soil remediation bag with fertilizer slow-release function by using livestock and poultry manure | |
| CN109702007B (en) | In-situ remediation method for moderate farmland heavy metal cadmium pollution |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20201218 |