CN114226432A - Method for repairing cadmium-arsenic polluted water field and cadmium-arsenic detoxification device - Google Patents
Method for repairing cadmium-arsenic polluted water field and cadmium-arsenic detoxification device Download PDFInfo
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- CN114226432A CN114226432A CN202010941883.1A CN202010941883A CN114226432A CN 114226432 A CN114226432 A CN 114226432A CN 202010941883 A CN202010941883 A CN 202010941883A CN 114226432 A CN114226432 A CN 114226432A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/08—Reclamation of contaminated soil chemically
- B09C1/085—Reclamation of contaminated soil chemically electrochemically, e.g. by electrokinetics
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C1/00—Reclamation of contaminated soil
- B09C1/10—Reclamation of contaminated soil microbiologically, biologically or by using enzymes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
- B09C—RECLAMATION OF CONTAMINATED SOIL
- B09C2101/00—In situ
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Abstract
The invention belongs to the field of heavy metal polluted land restoration, and particularly relates to a method for restoring a paddy field polluted by cadmium and arsenic and a cadmium and arsenic detoxification device. The invention provides a method for rapidly repairing land polluted by cadmium and arsenic and a cadmium and arsenic detoxification device thereof, aiming at solving the problem that the existing land is seriously polluted by cadmium and arsenic and loses production capacity. The technical scheme adopted by the invention is that the method for repairing the paddy field polluted by cadmium and arsenic comprises the following steps: s1: shallow ploughing the land and breaking soil blocks by using a rake; s2: injecting water into the paddy field to 20 cm to 30 cm; s3: measuring the content of cadmium and arsenic in an effective state in the paddy field, and adjusting the PH value to 6.8-7.2; s4: adding a sodium sulfate solution to a paddy field; s5: disposing detoxification devices for arsenic and cadmium in the field; s6: adding arsenic oxidizing bacteria and iron oxidizing bacteria S7 to water: putting green algae into water, and periodically fishing and cleaning the green algae; s8: and detecting the effective state cadmium and arsenic in the water.
Description
Technical Field
The invention belongs to the field of heavy metal polluted land restoration, and particularly relates to a method for restoring a paddy field polluted by cadmium and arsenic and a cadmium and arsenic detoxification device.
Background
Cadmium and arsenic are heavy metals, toxic, and can be absorbed by plants and thus affect human health through the food chain. With the development of industry and the aggravation of urban pollution and the increase of the types and the amounts of agricultural chemicals, the cadmium pollution and the arsenic pollution of soil are increasingly serious.
At present, a large number of farmlands in China suffer from cadmium pollution and arsenic. The area of 5-10% in cadmium polluted and arsenic farmlands has serious yield reduction, and various produced grains are not suitable for eating. Therefore, many contaminated land loses productivity, and if edible grains are planted on the contaminated land, a great deal of money and energy are needed, so that the search for a remediation method for the land contaminated by cadmium and arsenic is urgent.
Disclosure of Invention
In order to solve the existing problem that the land is seriously polluted by cadmium and arsenic and loses production capacity, the invention provides a method for quickly repairing the land polluted by cadmium and arsenic and a cadmium and arsenic detoxification device thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is that the method for repairing the cadmium-arsenic polluted water field comprises the following steps: s1: shallow ploughing the land and breaking soil blocks by using a rake; s2: injecting water into the paddy field to 20 cm to 30 cm; s3: measuring the content of cadmium and arsenic in an effective state in the paddy field, and adjusting the PH value to 6.8-7.2; s4: adding a sodium sulfate solution to a paddy field; s5: disposing detoxification devices for arsenic and cadmium in the field; s6: adding arsenic oxidizing bacteria and iron oxidizing bacteria S7 to water: putting green algae into water, and periodically fishing and cleaning the green algae; s8: and detecting the effective state cadmium and arsenic in the water.
Preferably, the depth of the shallow ploughing is 15 to 25 cm.
Preferably, a cadmium and arsenic detoxification device is suitable for the method for restoring the cadmium and arsenic polluted water field, and comprises the following steps: a plurality of negative pole reaction columns which are inserted in the paddy field; the positive reaction column is inserted in the paddy field; the positive electrode wiring cap is sleeved at the top end of the positive electrode reaction column; one end of the lead connecting cap is sleeved at the top end of the negative pole reaction column, and the other end of the lead connecting cap is connected with the positive pole wiring cap; the activated carbon net is placed in water and fixedly connected with the negative reaction column and the positive reaction column; the aerator is arranged beside the paddy field and supplies oxygen to the paddy field.
Preferably, the negative reaction column comprises a cylindrical iron pipe and a plastic support column; the cylindrical iron pipe is an iron cylinder with a bottom, and a plurality of small holes are formed in the iron cylinder; the plastic support column comprises a conical end and a column end, and the conical end is used for being inserted into soil; the bottom surface of the cylindrical iron pipe is upwards sleeved on the column end, and the top end of the column end is positioned above the water surface.
Preferably, the positive reaction column is a carbon rod.
Preferably, the activated carbon net is a diamond-shaped carbon activated carbon filter net, and the activated carbon net is fixedly connected with the plastic support columns.
Preferably, the positive pole reaction column is arranged in the middle of the paddy field, and the negative pole reaction columns are radially distributed on the edge of the paddy field by taking the positive pole reaction column as the center.
Preferably, the wire connection cap includes: the lead ring is sleeved at the top end of the negative reaction column; the insulating cap is sleeved on the lead ring, fixedly connected with the lead ring and sleeved at the top end of the negative reaction column; a wire connected to the wire loop; and the connector is connected with the other end of the lead and is used for being connected with the positive connecting cap.
Preferably, the positive terminal cap includes: the conducting ring is arranged at the top end of the anode reaction column and is fixedly connected with the anode reaction column; the insulating protective cap is sleeved outside the conducting ring and fixed with the missile ring, and a plurality of holes are formed in the side surface of the insulating protective cap sleeved at the top end of the anode reaction column; and the wire connecting ports are arranged in the holes of the insulating protective caps and are connected with the conducting rings.
The beneficial effects created by the invention are as follows: (1) in the application, shallow ploughing is carried out on a paddy field, soil blocks are smashed, and then water is added, so that effective cadmium and arsenic are ionized in the water to form a solution; (2) the invention generates hydrogen, hydroxyl and ferrous ions through oxygen absorption reaction of an iron-carbon primary battery, the hydroxyl is combined with effective cadmium to generate cadmium hydroxide precipitate, the ferrous ions generate ferric ions under the action of iron oxidizing bacteria, and then the ferric ions and arsenate ions generated by oxidation of arsenic oxidizing bacteria form ferric arsenate precipitate; (3) the activated carbon net can adsorb cadmium hydroxide and ferric arsenate, and meanwhile, because the activated carbon net is directly contacted with the carbon rod, the contact area between the positive electrode and the solution is increased, the reaction rate of the primary battery is accelerated, hydroxyl can be generated on the activated carbon net, and the adsorption can be rapidly completed; (4) the method is characterized in that a positive pole reaction column is taken as a center, a plurality of negative pole reaction columns are distributed in a radial shape, and a large number of cations are gathered below the negative pole reaction columns, so arsenate ions move towards the negative pole reaction columns, and an electric field is formed in a paddy field at the same time, and the formation of the electric field is favorable for precipitation polymerization; (5) meanwhile, algae are added into the water, so that organic arsenic can be detoxified, and formed ferric arsenate can be adsorbed; (6) the oxygen increasing machine can supply oxygen to continuously carry out the reaction on the activated carbon net.
Drawings
FIG. 1: overall structure schematic diagram of cadmium and arsenic detoxification device in paddy field
FIG. 2: the overall structure of the lead connecting cap and the cathode reaction column is schematically shown
FIG. 3: the structure of the positive terminal cap is shown as a schematic diagram
1. The device comprises a negative reaction column, 2, a lead connecting cap, 3, a positive reaction column, 4, an activated carbon net, 5, an insulating cap, 6, a cylindrical iron pipe, 7, a column end, 8, a conical end, 10, a connector, 11, a protective cap, 12 and a conducting ring.
Detailed Description
A method for restoring a cadmium-arsenic polluted water field comprises the following steps: s1: shallow ploughing the land and breaking soil blocks by using a rake; s2: injecting water into the paddy field to 20 cm to 30 cm; s3: measuring the content of cadmium and arsenic in an effective state in the paddy field, and adjusting the PH value to 6.8-7.2; s4: adding a sodium sulfate solution to a paddy field; s5: disposing detoxification devices for arsenic and cadmium in the field; s6: adding arsenic oxidizing bacteria and iron oxidizing bacteria S7 to water: putting green algae into water, and periodically fishing and cleaning the green algae; s8: the depth of the shallow ploughing for detecting the effective state of cadmium and arsenic in the water is 15-25 cm.
The cadmium and arsenic detoxification device is applicable to the remediation method of the cadmium and arsenic polluted water field, and comprises the following steps: a plurality of negative reaction columns 1 which are inserted in the paddy field; the positive reaction column 3 is inserted in the paddy field; the positive electrode wiring cap is sleeved at the top end of the positive electrode reaction column 3; one end of the lead connecting cap 2 is sleeved at the top end of the negative reaction column 1, and the other end of the lead connecting cap is connected with the positive wiring cap; the activated carbon net 4 is placed in water and fixedly connected with the cathode reaction column 1 and the anode reaction column 3; the aerator is arranged beside the paddy field and supplies oxygen to the paddy field.
The negative reaction column 1 comprises a cylindrical iron pipe 6 and a plastic support column; the cylindrical iron pipe 6 is an iron cylinder with a bottom, and a plurality of small holes are formed in the iron cylinder; the plastic support column comprises a conical end 8 and a column end 7, wherein the conical end 8 is used for being inserted into soil; the bottom surface of the cylindrical iron pipe 6 is upwards sleeved on the column end 7, and the top end of the column end 7 is positioned above the water surface.
The anode reaction column 3 is a carbon rod. The activated carbon net 4 is a diamond-shaped carbon activated carbon filter screen, and the activated carbon net 4 is fixedly connected with the plastic support columns.
The positive pole reaction column 3 is arranged in the middle of the paddy field, and the negative pole reaction column 1 is radially distributed on the edge of the paddy field by taking the positive pole reaction column 3 as the center.
The wire connection cap 2 includes: the lead ring is sleeved at the top end of the negative reaction column 1; the insulating cap 5 is sleeved on the lead ring, fixedly connected with the lead ring and sleeved at the top end of the cathode reaction column 1; a wire connected to the wire loop; and the connector 10 is connected with the other end of the lead and is used for being connected with the positive connecting cap.
The positive terminal connection cap includes: the conducting ring 12 is arranged at the top end of the anode reaction column and is fixedly connected with the anode reaction column; the insulating protective cap 11 is sleeved outside the conducting ring 12 and fixed with the missile ring, and a plurality of holes are formed in the side surface of the insulating protective cap 11 sleeved at the top end of the anode reaction column; and a plurality of wire connecting ports which are arranged in the holes of the insulation protection cap 11 and are connected with the conductive ring 12.
In the application, shallow ploughing is carried out on a paddy field, soil blocks are smashed, and then water is added, so that effective cadmium and arsenic are ionized in the water to form a solution; the invention generates hydrogen, hydroxyl and ferrous ions through oxygen absorption reaction of an iron-carbon primary battery, the hydroxyl is combined with effective cadmium to generate cadmium hydroxide precipitate, the ferrous ions generate ferric ions under the action of iron oxidizing bacteria, and then the ferric ions and arsenate ions generated by oxidation of arsenic oxidizing bacteria form ferric arsenate precipitate; the activated carbon net 4 can adsorb cadmium hydroxide and ferric arsenate, and meanwhile, because the activated carbon net 4 is directly contacted with the carbon rod, the contact area of the anode and the solution is equivalently increased, the reaction rate of the primary battery is accelerated, hydroxyl can be generated on the activated carbon net 4, and the adsorption can be rapidly completed; the method is characterized in that a positive pole reaction column 3 is taken as a center, a plurality of negative pole reaction columns 1 are distributed in a radial shape, and a large number of cations are gathered below the negative pole reaction columns 1, so arsenate ions can move towards the negative pole reaction columns 1, and an electric field is formed in a paddy field and is favorable for precipitation polymerization; meanwhile, algae are added into the water, so that organic arsenic can be detoxified, and formed ferric arsenate can be adsorbed; the oxygen-increasing machine can supply oxygen for the reaction on the active carbon net 4 can be continuously carried out, the device not only can be used for restoring the paddy field, but also can be used for maintaining the paddy field, and the device is put into the paddy field in the idle period of the paddy field, so that the cadmium and the arsenic in the paddy field can be prevented from exceeding the standard again for maintaining the paddy field.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the concepts of the present invention are all within the scope of protection defined by the claims.
Claims (9)
1. The method for repairing the cadmium-arsenic polluted water field is characterized by comprising the following steps:
s1: shallow ploughing the land and breaking soil blocks by using a rake;
s2: injecting water into the paddy field to 20 cm to 30 cm;
s3: measuring the content of cadmium and arsenic in an effective state in the paddy field, and adjusting the PH value to 6.8-7.2;
s4: adding a sodium sulfate solution to a paddy field;
s5: disposing detoxification devices for arsenic and cadmium in the field;
s6: adding arsenic oxidizing bacteria and iron oxidizing bacteria to water;
s7: putting green algae into water, and periodically fishing and cleaning the green algae;
s8: and detecting the effective state cadmium and arsenic in the water.
2. The method of claim 1, wherein the depth of the shallow plowing is 15 to 25 cm.
3. A cadmium and arsenic detoxification device suitable for use in the method of claim 1 for remediating a cadmium arsenic contaminated water field, comprising:
a plurality of negative pole reaction columns which are inserted in the paddy field;
the positive reaction column is inserted in the paddy field;
the positive electrode wiring cap is sleeved at the top end of the positive electrode reaction column;
one end of the lead connecting cap is sleeved at the top end of the negative pole reaction column, and the other end of the lead connecting cap is connected with the positive pole wiring cap;
the activated carbon net is placed in water and fixedly connected with the negative reaction column and the positive reaction column;
the aerator is arranged beside the paddy field and supplies oxygen to the paddy field.
4. The cadmium and arsenic detoxification device according to claim 3, wherein the negative reaction column comprises a cylindrical iron tube, a plastic support column; the cylindrical iron pipe is an iron cylinder with a bottom, and a plurality of small holes are formed in the iron cylinder; the plastic support column comprises a conical end and a column end, and the conical end is used for being inserted into soil; the bottom surface of the cylindrical iron pipe is upwards sleeved on the column end, and the top end of the column end is positioned above the water surface.
5. The cadmium and arsenic detoxification device according to claim 3, wherein the positive reaction column is a carbon rod.
6. The cadmium and arsenic detoxification device according to claim 4, wherein the activated carbon mesh is a diamond-shaped carbon activated carbon filter screen, and the activated carbon mesh is fixedly connected with a plastic support column.
7. The cadmium and arsenic detoxifying device of claim 3 wherein said positive reaction column is mounted in the middle of the paddy field and said negative reaction column is radially disposed around the edge of the paddy field with the positive reaction column as the center.
8. The cadmium and arsenic detoxification device according to claim 3, wherein the wire connection cap comprises:
the lead ring is sleeved at the top end of the negative reaction column;
the insulating cap is sleeved on the lead ring, fixedly connected with the lead ring and sleeved at the top end of the negative reaction column;
a wire connected to the wire loop;
and the connector is connected with the other end of the lead and is used for being connected with the positive connecting cap.
9. The cadmium and arsenic detoxification device according to claim 8, wherein the positive terminal cap comprises:
the conducting ring is arranged at the top end of the anode reaction column and is fixedly connected with the anode reaction column;
the insulating protective cap is sleeved outside the conducting ring, fixed with the missile ring and sleeved at the top end of the anode reaction column;
the side surface of the insulating protective cap is provided with a plurality of holes;
and the wire connecting ports are arranged in the holes of the insulating protective caps and are connected with the conducting rings.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010941883.1A CN114226432B (en) | 2020-09-09 | 2020-09-09 | Method for repairing cadmium-arsenic polluted water field and cadmium-arsenic detoxification device |
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| CN202010941883.1A CN114226432B (en) | 2020-09-09 | 2020-09-09 | Method for repairing cadmium-arsenic polluted water field and cadmium-arsenic detoxification device |
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| CN114226432B CN114226432B (en) | 2023-03-21 |
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| CN108114975A (en) * | 2017-12-07 | 2018-06-05 | 中国科学院地球化学研究所 | The method that micro- aerobic iron-oxidizing bacteria group administers As polluted soil |
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2020
- 2020-09-09 CN CN202010941883.1A patent/CN114226432B/en active Active
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104370324A (en) * | 2014-03-25 | 2015-02-25 | 中国科学院海洋研究所 | Method for adsorbing heavy metal ions in environment by utilizing macroalgae |
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| CN107841477A (en) * | 2017-12-08 | 2018-03-27 | 福建农林大学 | Application of one plant of arsenic oxidizing bacteria in rice trivalent arsenic pollution is reduced |
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