CN114101303A - Heavy metal polluted rice field repairing system and method - Google Patents
Heavy metal polluted rice field repairing system and method Download PDFInfo
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- CN114101303A CN114101303A CN202111425008.9A CN202111425008A CN114101303A CN 114101303 A CN114101303 A CN 114101303A CN 202111425008 A CN202111425008 A CN 202111425008A CN 114101303 A CN114101303 A CN 114101303A
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- 229910001385 heavy metal Inorganic materials 0.000 title claims abstract description 133
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- 235000009566 rice Nutrition 0.000 title claims abstract description 34
- 238000000034 method Methods 0.000 title claims abstract description 23
- 240000007594 Oryza sativa Species 0.000 title 1
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- 238000001179 sorption measurement Methods 0.000 claims abstract description 26
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- 238000010521 absorption reaction Methods 0.000 abstract description 5
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- 238000005067 remediation Methods 0.000 description 11
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- BJEPYKJPYRNKOW-UHFFFAOYSA-N alpha-hydroxysuccinic acid Natural products OC(=O)C(O)CC(O)=O BJEPYKJPYRNKOW-UHFFFAOYSA-N 0.000 description 1
- 229960000892 attapulgite Drugs 0.000 description 1
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- XYJRXVWERLGGKC-UHFFFAOYSA-D pentacalcium;hydroxide;triphosphate Chemical compound [OH-].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[Ca+2].[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O.[O-]P([O-])([O-])=O XYJRXVWERLGGKC-UHFFFAOYSA-D 0.000 description 1
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Images
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
-
- 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
Abstract
The invention relates to a restoration system and a restoration method for a heavy metal polluted rice field. The heavy metal polluted rice field restoration system comprises a plurality of heavy metal removal units; the heavy metal removing units are arranged on the surface of the soil in the heavy metal polluted rice field at intervals; the heavy metal removing unit comprises an inner core layer and an outer layer arranged on the outer side of the inner core layer, and an adsorption and fixation material is filled in the inner core layer; the adsorption and fixation material is at least partially positioned in the accumulated water of the heavy metal polluted rice field. This repair system in heavy metal pollution paddy field can effectively realize that the absorption of heavy metal removes, little to the plant growth disturbance, and is convenient for implement by a large scale.
Description
Technical Field
The invention relates to the technical field of heavy metal pollution prevention and treatment, in particular to a restoration system and a restoration method for a heavy metal polluted rice field.
Background
Rice is a widely cultivated grain crop in China. Because the heavy metal represented by cadmium can be absorbed by the plant root system and enriched to grains, the human health is threatened, and the important key is to find the low-cost, safe and efficient heavy metal pollution paddy field restoration technology.
In the traditional method, the biogeochemical form of the heavy metal elements is changed by adding stabilizing materials such as lime, biochar and the like into soil, so that the enrichment capacity of rice on the heavy metal elements is reduced. The traditional method can only maintain the short-term effectiveness, and the stabilized heavy metal can be reactivated and enriched in the plant body under the effects of long-term rainfall leaching, temperature change and the environmental aging process of microbial utilization, so that the repair failure is caused.
In addition, the method for adsorbing and treating the heavy metal cadmium in the soil is provided by the other method, the calcium alginate-sodium polyacrylate microspheres are prepared firstly, then the calcium alginate-sodium polyacrylate microspheres and the cadmium-polluted soil are fully mixed, then the calcium alginate-sodium polyacrylate microspheres and the cadmium-polluted soil are sieved and separated, the microspheres adsorbed with the heavy metal cadmium are recycled, and the soil after adsorption and treatment is backfilled. The method needs to realize the separation of the microspheres adsorbing heavy metals from the soil in a sieving mode, which is difficult to realize for large-area polluted farmlands, and simultaneously, the original ecology of the soil is damaged by mixing the microspheres with the soil, so that the growth of plants is interfered.
Disclosure of Invention
Based on the method, the heavy metal polluted rice field restoration system and method can effectively realize the adsorption and removal of the heavy metal, have small disturbance to the growth of plants and are convenient to implement in a large area.
The invention provides a heavy metal polluted rice field repairing system, which comprises a plurality of heavy metal removing units; the heavy metal removing units are arranged on the surface of the soil in the heavy metal polluted rice field at intervals;
the heavy metal removing unit comprises an inner core layer and an outer layer arranged on the outer side of the inner core layer, and an adsorption and fixation material is filled in the inner core layer; the adsorption and fixation material is at least partially positioned in the accumulated water of the heavy metal polluted rice field.
In one embodiment, the interval arrangement means that the distance between two adjacent heavy metal removal units is x, wherein x is (2.5-5) × d, and d is the distance between two adjacent rice plants; and/or
The filling amount of the adsorption and fixation material is 400-500 g.
In one embodiment, the inner core layer is made of 500-800 mesh nylon net; and/or
The outer layer is made of polyester needle felt or nylon cloth.
In one embodiment, the distance between the inner core layer and the outer layer is 0.5 cm-1 cm.
In one embodiment, 2 or more heavy metal removing units are connected in series through a sleeve to form an ecological strip, the sleeve penetrates through the heavy metal removing units, and a plurality of drainage ports are formed in the sleeve.
In one embodiment, the inner diameter r of the cannula00.5-1 cm, outer diameter r1-r00.3-0.5 cm; the distance D between two adjacent discharge ports is 10 cm-15 cm, and the aperture phi of each discharge port is 0.3 cm-0.5 cm.
In one embodiment, the plurality of ecological strips are arranged in parallel, and the distance between two adjacent ecological strips is y, wherein y is (2.5-6) x d, and d is the distance between two adjacent rice plants.
In one embodiment, the system for remedying the heavy metal contaminated paddy field further comprises an automatic controller, wherein the automatic controller is connected to the ecological strip.
In a second aspect of the present invention, there is provided a method for restoring a heavy metal-contaminated paddy field, which is carried out by using the system for restoring a heavy metal-contaminated paddy field according to the first aspect, the method comprising the steps of:
and in the flooding period of the rice field, a plurality of heavy metal removing units are arranged on the soil surface of the heavy metal polluted rice field at intervals, and the adsorption and fixation material is at least partially positioned in the accumulated water of the heavy metal polluted rice field.
In a third aspect of the present invention, a method for restoring a heavy metal-contaminated paddy field, which is carried out by using the system for restoring a heavy metal-contaminated paddy field according to the first aspect, comprises the steps of:
in the flooding period of the paddy field, a plurality of heavy metal removing units are arranged on the surface of the soil in the heavy metal polluted paddy field at intervals, and the adsorption and fixation material is at least partially positioned in the accumulated water in the heavy metal polluted paddy field;
and conveying the aqueous solution of the heavy metal activator through the sleeve, wherein the aqueous solution of the heavy metal activator flows into the heavy metal polluted paddy field through the drainage port.
Above-mentioned repair system in heavy metal pollution paddy field, it has the heavy metal removal unit of absorption fixed material to lay the packing through the soil surface in heavy metal pollution paddy field, can be at the direct heavy metal that adsorbs and fix in the water phase of following in the stage of flooding in paddy field, effectively reduce the concentration of heavy metal in the soil, and combine the heavy metal to get rid of the recovery and the change of absorption fixed material in the unit, can be in order to remove the heavy metal, avoided heavy metal to activate and spread again in the paddy field. Meanwhile, the original ecology of the soil can not be damaged, and the disturbance to the growth of plants is reduced. And can be laid in large area and high efficiency, and is suitable for the rapid repair of large-area paddy fields.
Furthermore, the heavy metal removal units are connected in series through the sleeve with the drainage port to form the ecological strip, so that on one hand, a heavy metal activator can be introduced through the sleeve to realize a better heavy metal adsorption and fixation effect in cooperation with the heavy metal removal units; on the other hand, can conveniently lay or retrieve a plurality of heavy metal and get rid of the unit through ecological strip, be convenient for realize prosthetic automation and scale.
In addition, compared with the stabilization technology, the remediation system for the heavy metal polluted rice field can be used for remediation, the physicochemical property of soil can not be changed, and the remediation system can not poison rice and soil microorganisms.
Drawings
Fig. 1 is a front view showing the arrangement of a system for remediating a heavy metal contaminated paddy field in a paddy field according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the construction of a heavy metal removing unit in the system for remediating a heavy metal-contaminated paddy field shown in FIG. 1;
FIG. 3 is a plan view showing the arrangement in the paddy field in the system for remediating a heavy metal-contaminated paddy field shown in FIG. 1;
FIG. 4 is a sectional view of the casing pipe in the system for remediating a heavy metal-contaminated paddy field shown in FIG. 1;
FIG. 5 is a longitudinal sectional view of the casing pipe in the system for remediating a heavy metal-contaminated paddy field shown in FIG. 1;
FIG. 6 is a schematic view showing the connection of the ecological strip and the automated control device in the system for remediating a heavy metal contaminated paddy field shown in FIG. 1;
FIG. 7 is a graph showing the change of pH of soil with time during the course of remediation using the remediation system for heavy metal-contaminated paddy fields according to an embodiment of the present invention;
FIG. 8 is a graph showing the time-dependent change in the total Cd concentration in the soil during the remediation process using the remediation system for heavy metal-contaminated paddy fields according to an embodiment of the present invention;
fig. 9 is a comparison of Cd concentrations in rice grains repaired by the heavy metal contaminated paddy field repairing system according to the embodiment of the present invention.
Detailed Description
The following will explain the system and method for restoring heavy metal contaminated paddy field according to the present invention in detail with reference to the following embodiments. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
As used herein, the term "and/or", "and/or" includes any one of two or more of the associated listed items, as well as any and all combinations of the associated listed items, including any two of the associated listed items, any more of the associated listed items, or all combinations of the associated listed items.
As used herein, "one or more" refers to any one, any two, or any two or more of the listed items.
In the present invention, "first aspect", "second aspect", "third aspect" and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or quantity, nor are they to be construed as implicitly indicating the importance or quantity of the technical feature indicated. Also, "first," "second," "third," etc. are for non-exhaustive enumeration description purposes only and should not be construed as constituting a closed limitation to the number.
In the present invention, the technical features described in the open type include a closed technical solution composed of the listed features, and also include an open technical solution including the listed features.
In the present invention, the numerical intervals are regarded as continuous, and include the minimum and maximum values of the range and each value between the minimum and maximum values, unless otherwise specified. Further, when a range refers to an integer, each integer between the minimum and maximum values of the range is included. Further, when multiple range-describing features or characteristics are provided, the ranges may be combined. In other words, unless otherwise indicated, all ranges disclosed herein are to be understood to encompass any and all subranges subsumed therein.
The percentage contents referred to in the present invention mean, unless otherwise specified, mass percentages for solid-liquid mixing and solid-solid phase mixing, and volume percentages for liquid-liquid phase mixing.
The percentage concentrations referred to in the present invention refer to the final concentrations unless otherwise specified. The final concentration refers to the ratio of the additive component in the system to which the component is added.
The temperature parameter in the present invention is not particularly limited, and may be a constant temperature treatment or a treatment within a certain temperature range. The constant temperature process allows the temperature to fluctuate within the accuracy of the instrument control.
As shown in fig. 1, the present invention provides a system for remediating a heavy metal contaminated paddy field, comprising a plurality of heavy metal removing units 100; several heavy metal removing units 100 are disposed at intervals on the surface of the soil 200 of the heavy metal contaminated paddy field. Therefore, the original ecology of the soil can not be damaged, and the disturbance to the growth of plants is reduced. It is understood that rice 300 is also planted in the soil 200 of the heavy metal contaminated paddy field.
As shown in fig. 2, the heavy metal removing unit 100 includes an inner core layer 101 and an outer layer 102 disposed outside the inner core layer 101, and the inside of the inner core layer 101 is filled with an adsorption fixing material. Meanwhile, as shown in fig. 1, the heavy metal contaminated paddy field is in a flooding period, and the surface of the soil 200 of the heavy metal contaminated paddy field also has a water accumulation layer 400. The adsorption and fixation material filled in the inner core layer 101 is at least partially positioned in the water accumulation layer 400 of the heavy metal contaminated paddy field. The accumulated water in the flooding period of the heavy metal polluted rice field is reasonably utilized, the heavy metal is dissolved into the accumulated water from the soil, and the heavy metal removing unit 100 directly adsorbs and fixes the heavy metal from the accumulated water. Further, the adsorption and fixation material filled in the inner core layer 101 is entirely located in the water accumulation layer 400 of the heavy metal contaminated paddy field. In one example, the water accumulation depth d of the water accumulation layer 400waterIs in the range > 0. Further, 0 < dwaterLess than or equal to 15 cm. As will be appreciated, as rice growth progresses, the water in the paddy field gradually dries out, i.e., dwater＝0，dwaterThe heavy metal removal unit 100 may be removed for an extended period of time after 0.
By way of example and not limitation, as shown in fig. 2, the heavy metal removal unit 100 is cylindrical. Specifically, the length h of the heavy metal removing unit 100 along the central axis direction is 15cm to 25cm, and the radius r of the inner core layer 101inIs 5 cm-6 cm. In one example, the distance between the inner core layer 101 and the outer layer 102 is 0.5cm to 1cm, i.e., the radius r of the outer layer 102out-rinThe thickness is 0.5cm to 1 cm. The space is reserved, on one hand, effective contact between heavy metal in accumulated water and the adsorption and fixation material filled in the inner core layer 101 is facilitated, on the other hand, the adsorption and fixation material can be protected, and leakage to accumulated water is avoided. It will be appreciated that the space between the inner core layer 101 and the outer layer 102 is not filled.
In one example, the material of the inner core layer 101 is a 500-800 mesh nylon mesh. In one example, the material of the outer layer 102 is polyester needle felt or nylon cloth. The heavy metal removal unit 100 thus fabricated is resistant to treading and squeezing, and can be adapted to automatic seeding of normal rice transplanter and other agricultural implements.
In one example, the filling amount of the adsorptive fixing material filled in the inner core layer 101 is 400g to 500 g.
In one example, the adsorptive fixing material filled in the inner core layer 101 includes an adsorptive material and a fixing material. Further, the specific surface area of the adsorbing material is more than 100m2Clay mineral per gram. It can realize through the principle of physical adsorption that heavy metal from the ponding of paddy field to the effective, quick absorption of material hole. In particular, the adsorbent material is selected from one or more of montmorillonite, attapulgite and the remaining 2:1 clay minerals. Further, the fixing material is a mineral containing a phosphate group. The material contains a key heavy metal fixing group, and can firmly fix the heavy metal weakly adsorbed by the adsorption material through the mechanism of precipitation and surface complexation and through chemical action. Specifically, the fixing material is selected from one or more of struvite, phosphate rock and hydroxyapatite. Furthermore, the mass ratio of the adsorbing material to the fixing material is (1-2): 1.
As shown in fig. 3, in one example, the distance between two adjacent heavy metal removal units 100 is x, where x is (1.5-7.5) × d, where d is the distance between two adjacent rice plants. Specifically, d is 0.2 to 0.3m, and x is 0.5 to 1.5 m.
Further, in one example, as shown in fig. 2 and 3, 2 or more heavy metal removal units 100 are connected in series by a sleeve 103 to form an ecological strip 500, and the sleeve 103 penetrates the heavy metal removal units 100. As shown in fig. 4 and 5, the sleeve 103 is a porous sleeve with a plurality of vents 104. The heavy metal removal units 100 are connected in series through the sleeve 103 with the drainage port 104 to form the ecological strip 500, on one hand, a heavy metal activator can be introduced through the sleeve 103, the heavy metal activator is injected into accumulated water through the drainage port 104 to activate heavy metal, and a better heavy metal adsorption and fixation effect can be achieved in cooperation with the heavy metal removal units 100; on the other hand, the plurality of heavy metal removal units 100 can be conveniently paved or recycled through the ecological bar 400, so that the automation and scale of the repair can be conveniently realized. Further, the method can be used for preparing a novel materialThe inner diameter r of the sleeve 10300.5-1 cm, outer diameter r1-r0The distance D between two adjacent discharge ports 104 is 0.3cm to 0.5cm, and the aperture diameter of the discharge port 104 is 0.3cm to 0.5 cm.
As shown in fig. 3, a plurality of ecological strips 500 are arranged in parallel, a distance between two adjacent ecological strips is y, (2.5-6) × d, where d is a distance between two adjacent rice plants. Specifically, d is 0.2 to 0.3m, and y is 0.8 to 1.2 m.
In one example, the heavy metal activator is selected from one or more of citric acid, oxalic acid and malic acid. Specifically, the heavy metal activator is injected into the accumulated water through the casing 103 in the form of an aqueous solution of the heavy metal activator by dissolving in water. Further, the concentration of the heavy metal activator aqueous solution is 0.05-0.2 mol/L. The dissolution concentration can ensure that the heavy metal can be effectively activated to promote the adsorption of the heavy metal, and the pH value of the paddy field soil can not be obviously reduced. Furthermore, the injection rate of the heavy metal activator aqueous solution is 0.1-0.5 mL/h. In one example, the heavy metal activator is injected only 10-15 days after the deployment of the ecological strip 500.
In addition, as shown in fig. 6, in one example, the above-mentioned heavy metal contaminated paddy field restoration system further includes an automatic controller 600, and the automatic controller 600 is connected to the ecological strip 500. Thus, the automation control of the ecosystem can be realized, for example, but not limited to, the automation controller 600 is a PLC control system, and the automation controller 600 can be disposed at the edge of the rice field, for example.
Further, the automatic controller 600 may be connected in parallel with a plurality of ecological strips 500, the automatic controller 600 is connected to the ecological strips 500 through the transmission device 700 and the peristaltic pump 800, respectively, and the automatic controller 600 controls the transmission device 700 and the peristaltic pump 800 through automatic programming. In addition, the water quality, pH and Eh can be monitored in real time. The transmission device 700 can be used for automatically laying and recovering the ecological strips 500, and the peristaltic pump 800 can automatically add the heavy metal activator, so that the timed addition of the heavy metal activator is realized.
Specific application examples are as follows.
Example (b):
aiming at the paddy field with Cd concentration of 0.75mg/kg and soil pH of 6.8, the heavy metal polluted paddy field remediation system mainly shown in figure 3 is utilized to carry out remediation on the paddy field.
Basic parameters of the remediation system of the heavy metal contaminated paddy field:
(1) cadmium removing bag (heavy metal removing unit)
The material of the inner core layer: a 500 mesh nylon net;
the material of the outer layer: polyester needle felt;
h＝20cm；
rin＝5cm；
rout-rin＝0.7cm；
adsorbing material: montmorillonite;
fixing materials: struvite;
the proportion of the adsorption material to the fixing material is as follows: 1.5:1 (mass ratio), and the filling amount was 500 g.
(2) Arranging:
the sowing time of the rice is as follows: 5, month and 15 days;
the rice harvesting time is as follows: 10 months and 15 days;
the cadmium removing bag has the action time: 15 days in 5 months to 15 days in 8 months (flooding period, initial water accumulation depth d)water15cm, then naturally dried);
the distance x between the cadmium removing bags is 0.8 m;
the rice planting distance d is 0.25 m;
the distance y between the two ecological strips is 1.0 m;
heavy metal activator: citric acid, dissolved in water, slowly delivered into the transfusion layer. The dissolution concentration is 0.1mol/L, the injection rate is 0.3mL/h, and the injection is only carried out in the first 10 days (5 months, 15 days to 5 months, 24 days) of the arrangement of the ecological strips;
geometric dimensions of the sleeve: r is0＝0.5cm，r1-r0＝0.5cm；
The distance D between the drainage ports is 15 cm;
the aperture phi of the discharge port is 0.5 cm.
The soil change in the paddy field was recorded in different areas of the paddy field as control group, restoration group-Tonic citric acid and restoration group-Tonic citric acid, respectively, and the results are shown in FIGS. 7 to 9.
As can be seen from FIG. 7, compared with the control group, the pH of the soil was decreased and the Cd activity of the soil was increased in the first 10 days by the citric acid treatment, and the pH of the soil tended to be stable in a longer time scale. The processing mode of obstructed citric acid is because the adsorption and fixation material homoenergetic promotes soil pH, presents the trend that pH risees gradually, and soil Cd tends to the passivation, is unfavorable for the absorption removal of Cd.
As can be seen from FIG. 8, compared with the control group, the total concentration of Cd is continuously reduced by the treatment of citric acid, and after remediation, the concentration of Cd in the soil is reduced from 0.75mg/kg (exceeding the risk screening value specified in soil environmental quality agricultural land soil pollution risk control Standard (GB 15618-2018)) to 0.31mg/kg (not exceeding the screening value, reduced by 58.6%). The total concentration of Cd is continuously reduced without the citric acid, the concentration of Cd in the soil after restoration is reduced from 0.75mg/kg to 0.52mg/kg (the concentration of Cd in the soil is not higher than the screening value and is reduced by 30.7%), and although the concentration of Cd in the soil is also obviously reduced, the treatment effect is poorer than that of the method with citric acid.
As can be seen from FIG. 9, the concentration of Cd in the rice grains grown in the control group is 2.9mg/kg, which exceeds the concentration limit value of 0.2mg/kg specified in the national food safety Standard contaminant Limit (GB 2762-2017), while the concentration of Cd in the grains in the restoration group can be respectively reduced to 0.09mg/kg (with citric acid) and 0.19mg/kg (with citric acid), which are both lower than the limit value.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, so as to understand the technical solutions of the present invention specifically and in detail, but not to be understood as the limitation of the protection scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. It should be understood that the technical solutions provided by the present invention, which are obtained by logical analysis, reasoning or limited experiments, are within the scope of the appended claims. Therefore, the protection scope of the present invention should be subject to the content of the appended claims, and the description and the drawings can be used for explaining the content of the claims.
Claims (10)
1. A restoration system for heavy metal polluted paddy fields is characterized by comprising a plurality of heavy metal removal units; the heavy metal removing units are arranged on the surface of the soil in the heavy metal polluted rice field at intervals;
the heavy metal removing unit comprises an inner core layer and an outer layer arranged on the outer side of the inner core layer, and an adsorption and fixation material is filled in the inner core layer; the adsorption and fixation material is at least partially positioned in the accumulated water of the heavy metal polluted rice field.
2. The heavy metal contaminated paddy field restoration system according to claim 1, wherein the spacing arrangement means that the distance between two adjacent heavy metal removal units is x, wherein x is (2.5 to 5) × d, and d is the distance between two adjacent paddy rice; and/or
The filling amount of the adsorption and fixation material is 400-500 g.
3. The heavy metal contaminated paddy field restoration system according to claim 1, wherein the inner core layer is made of a nylon mesh of 500 to 800 meshes; and/or
The outer layer is made of polyester needle felt or nylon cloth.
4. The system for remediating a heavy metal contaminated paddy field as claimed in claim 1, wherein the distance between said inner core layer and said outer layer is 0.5cm to 1 cm.
5. The heavy metal contaminated paddy field restoration system according to any one of claims 1 to 4, wherein 2 or more heavy metal removal units are connected in series by a sleeve to form an ecological strip, the sleeve penetrates the heavy metal removal units, and a plurality of drainage ports are formed in the sleeve.
6. The system for remediating a heavy metal contaminated paddy field as claimed in claim 5, wherein said inner diameter r of said casing pipe is set to be larger than said inner diameter r of said casing pipe00.5-1 cm, outer diameter r1-r00.3-0.5 cm; the distance D between two adjacent discharge ports is 10 cm-15 cm, and the aperture phi of each discharge port is 0.3 cm-0.5 cm.
7. The heavy metal contaminated paddy field restoration system according to claim 5, wherein said plurality of ecological strips are arranged in parallel, and the distance between two adjacent ecological strips is y (2.5-6) x d, wherein d is the distance between two adjacent paddy fields.
8. The system for remediating a heavy metal contaminated paddy field as claimed in claim 5, further comprising an automated controller connected to said ecological strip.
9. A method for restoring a heavy metal-contaminated paddy field, characterized in that the restoration system of the heavy metal-contaminated paddy field according to any one of claims 1 to 4 is used for restoration, and the restoration method comprises the following steps:
and in the flooding period of the rice field, a plurality of heavy metal removing units are arranged on the soil surface of the heavy metal polluted rice field at intervals, and the adsorption and fixation material is at least partially positioned in the accumulated water of the heavy metal polluted rice field.
10. A method for restoring a heavy metal-contaminated paddy field, characterized in that the restoration system for a heavy metal-contaminated paddy field according to any one of claims 5 to 8 is used for restoration, and the restoration method comprises the steps of:
in the flooding period of the paddy field, a plurality of heavy metal removing units are arranged on the surface of the soil in the heavy metal polluted paddy field at intervals, and the adsorption and fixation material is at least partially positioned in the accumulated water in the heavy metal polluted paddy field;
and conveying the aqueous solution of the heavy metal activator through the sleeve, wherein the aqueous solution of the heavy metal activator flows into the heavy metal polluted paddy field through the drainage port.
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