CN111423079A - Contaminated bottom mud in-situ capping method combining heterogeneous layered coverage with chemical treatment - Google Patents
Contaminated bottom mud in-situ capping method combining heterogeneous layered coverage with chemical treatment Download PDFInfo
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- CN111423079A CN111423079A CN202010120652.4A CN202010120652A CN111423079A CN 111423079 A CN111423079 A CN 111423079A CN 202010120652 A CN202010120652 A CN 202010120652A CN 111423079 A CN111423079 A CN 111423079A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/008—Sludge treatment by fixation or solidification
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/004—Sludge detoxification
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Abstract
The invention relates to a polluted bottom mud in-situ cap sealing method combining heterogeneous layered covering with chemical treatment, which comprises the following steps: adding a compound chemical agent into the polluted bottom mud to reduce harmful substances; the capping material is added to the surface of the polluted bottom mud to be treated in a layered mode, so that the polluted bottom mud is isolated from the overlying water body, and the migration of pollutants in the bottom mud to the water body is reduced. The method can reduce the amount of pollutants in the bottom mud of the polluted water body, effectively control the migration of the pollutants to the overlying water body, and greatly reduce the cost of bottom mud repair on the premise of ensuring the quality of bottom mud repair.
Description
Technical Field
The invention relates to an in-situ remediation method for polluted water body bottom mud, in particular to an in-situ capping method for polluted bottom mud by combining heterogeneous layered covering with chemical treatment.
Background
The bottom mud in the river bed is an important place and environment for material exchange in a river ecosystem, and can be released into a water body again after absorbing nutrient substances and toxic substances from the water body. To thoroughly solve the problem of water pollution, not only the pollution source is cut off, but also the pollutants in the sediment are removed. Throughout the world, sediment contamination has become a widespread environmental concern.
The polluted bottom mud restoration technology is mainly divided into in-situ treatment and ex-situ treatment according to the treatment mode. Dredging is a widely used ex-situ treatment mode, but the engineering cost is high, the bottom sediment is easily disturbed in the actual operation, and the risk of accelerating the release of pollutants exists. While in situ treatment mainly utilizes physical, chemical or biological techniques to treat the bottom sludge in situ. Chemical agent restoration is a quick and effective restoration mode, and harmful substances in sediment are reduced by adding chemical agents to generate chemical reaction, physical action and the like with the polluted sediment in the sediment. In the in-situ capping technology, the clean covering material is laid on the surface of the polluted bottom sediment to isolate the polluted bottom sediment from the overlying water body, the polluted bottom sediment is solidified to prevent the polluted bottom sediment from suspending or migrating, and organic particles are added into the covering material to adsorb pollutants in the polluted bottom sediment, so that the purpose of preventing the polluted bottom sediment from polluting the overlying water body is achieved. However, no matter the chemical agent repair or the in-situ capping technology is adopted, in order to achieve the purpose of controlling pollution, the required medicine or capping material is large in dosage and high in cost. Therefore, how to reduce the in-situ repair cost is a problem which is urgently concerned by many manufacturers.
Disclosure of Invention
The invention aims to provide an in-situ capping method for contaminated sediment by combining heterogeneous layered coverage with chemical treatment, which aims at overcoming the defects of an in-situ repair technology and solving the problems in the prior art.
The technical scheme adopted by the invention is as follows:
the method for in-situ capping of the polluted bottom mud by combining heterogeneous layered covering with chemical treatment is characterized by comprising the following steps of:
the method comprises the following steps:
(1) adding a compound chemical agent into the polluted bottom mud to reduce harmful substances;
(2) the capping material is added to the surface of the polluted bottom mud to be treated in a layered mode, so that the polluted bottom mud is isolated from the overlying water body, and the migration of pollutants in the bottom mud to the water body is reduced.
And (3) after the compound medicament is added for 7 to 10 days in the step (1), carrying out capping on the polluted bottom mud in the step (2).
In the step (1), the compound chemical agent is a mixture of calcium peroxide and polyaluminium chloride.
In the step (1), the mass ratio of calcium peroxide to polyaluminium chloride in the composite chemical agent is 50: 1.
in the step (1), the adding sequence of the composite chemical agent is that calcium peroxide is added firstly and then polyaluminium chloride is added.
In the step (2), the capping material comprises a plurality of layers of materials, and each layer of material is selected from zeolite, coarse sand, fine sand, hydroxyapatite, pollution-free soil and gravel.
In the step (2), the total thickness of the covering layer formed by the capping material is 8-12 cm.
In the step (2), the capping material comprises a lower layer, a middle layer and an upper layer which are respectively zeolite, coarse sand and fine sand.
In the step (2), the thickness ratio of the zeolite to the coarse sand to the fine sand is 1: 1: 2.
in the step (2), in the process of adding the capping material, firstly adding the lower layer covering material, adding the middle layer covering material after the material is stabilized for 1 day, and adding the lower layer covering material after the material is continuously stabilized for 1 day.
The invention has the following advantages:
1. the capping material used in the invention has good adsorption performance and good barrier and stabilization effects on pollutants, and the three layers of materials can play respective roles in the process of treating the bottom mud.
2. The chemical repairing agent used in the invention can rapidly generate chemical reaction and physical action with the polluted sediment, so that harmful substances in the sediment are reduced, and the pollutants are separated from the bottom mud and converted into a low-toxicity or non-toxic stable chemical form.
3. The layered covering of a plurality of different materials can greatly reduce the material cost compared with the covering of a single material on the premise of ensuring the inhibition of the migration of pollutants.
4. The chemical agent is matched for use, and on the premise of ensuring the pollutant reduction effect, compared with a single agent, the chemical agent greatly reduces the cost.
5. The in-situ cap seal is matched with a chemical agent for use, so that the bottom sediment repair cost can be greatly reduced on the premise of ensuring the bottom sediment repair quality.
Drawings
FIG. 1 is a schematic representation of the case when zeolite, grit and fine sand are selected as the capping material. The zeolite, the coarse sand and the fine sand respectively correspond to the lower layer, the middle layer and the upper layer, and the thickness ratio is controlled to be 1: 1: 2.
FIG. 2 is a schematic view of the addition of chemical agents to the bottom sludge. Wherein the chemical agent is a mixed agent of calcium peroxide and polyaluminium chloride.
FIG. 3 is a schematic diagram of the combination of chemical remediation and in-situ capping to remediate contaminated sediment.
Detailed Description
The present invention will be described in detail with reference to specific embodiments.
The invention relates to a polluted bottom mud in-situ cap sealing method combining heterogeneous layered covering with chemical treatment, which comprises the following steps:
(1) adding a compound chemical agent into the polluted bottom mud to reduce harmful substances;
(2) the capping material is added to the surface of the polluted bottom mud to be treated in a layered mode, so that the polluted bottom mud is isolated from the overlying water body, and the migration of pollutants in the bottom mud to the water body is reduced.
In the step (1), the composite chemical agent is a mixture of calcium peroxide and polyaluminium chloride, and the mass ratio is 50: 1.
and (3) capping the polluted bottom mud in the step (2) after the compound medicament is added for 7 to 10 days in the step (1).
In the step (2), the capping material is gradually stabilized after being added for 3 days, and the migration of pollutants to an overlying water body is inhibited by physical chemical adsorption, physical barrier, ion exchange, biochemical explanation, fixation and other modes.
In the step (2), the capping material comprises a plurality of layers of materials, and each layer of material is selected from zeolite, coarse sand, fine sand, hydroxyapatite, pollution-free soil and gravel. The total thickness of the covering layer formed by the capping material is 8-12 cm. Preferably, in the step (2), the capping material comprises a lower layer, a middle layer and an upper layer, which are respectively zeolite, coarse sand and fine sand, and the thickness ratio is 1: 1: 2.
in the step (2), in the adding process of the heterogeneous layered covering material, firstly adding the lower covering material, adding the middle covering material after the material is stabilized for 1 day, and adding the lower covering material after the material is continuously stabilized for 1 day.
The method can reduce the amount of pollutants in the bottom mud of the polluted water body, effectively control the pollutants to migrate to the overlying water body, and greatly reduce the cost of bottom mud repair on the premise of ensuring the quality of bottom mud repair.
The technical contents of the present invention will be described in detail below with reference to several embodiments.
Example 1:
selecting a mixed medicament of calcium peroxide and polyaluminium chloride for in-situ chemical remediation, and after pollutants are reduced, performing in-situ covering to restore the bottom mud of the polluted water body (see figure 3).
(1) The mass ratio of the calcium peroxide to the polyaluminium chloride is 50: 1, the adding sequence is that calcium peroxide is added firstly and then polyaluminium chloride is added. (see FIG. 2)
(2) The covering is selected from zeolite, coarse sand and fine sand from bottom to top, and the thickness ratio is 1: 1: 2 (see fig. 1).
The selected zeolite has a particle size of 1-2mm and a bulk density of 1.01g/cm3。
The selected coarse sand has a particle size of 0.35-0.5mm and a bulk density of 0.70g/cm3。
The selected fine sand has a particle size of 0.15-0.2mm and a bulk density of 0.84g/cm3。
In practice, the capping material is delivered to the contaminated substrate surface layer by means of a vehicle or a delivery pipe.
Example 2:
selecting a mixed medicament of calcium peroxide and polyaluminium chloride for in-situ chemical remediation, and after pollutants are reduced, performing in-situ covering to restore the bottom mud of the polluted water body (see figure 3).
(1) The mass ratio of the calcium peroxide to the polyaluminium chloride is 50: 1, the adding sequence is that calcium peroxide is added firstly and then polyaluminium chloride is added. (see FIG. 2)
(2) The covering is selected from zeolite, hydroxyapatite and fine sand from bottom to top, and the thickness ratio is 1: 1: 2 (see fig. 1).
The selected zeolite has a particle size of 1-2mm and a bulk density of 1.01g/cm3。
The selected fine sand has a particle size of 0.15-0.2mm and a bulk density of 0.84g/cm3。
Example 3:
selecting a mixed medicament of calcium peroxide and polyaluminium chloride for in-situ chemical remediation, and adding an in-situ covering material for remediation of the bottom mud of the polluted water body after the dosage is reduced for 7 to 10 days.
(1) The mass ratio of the calcium peroxide to the polyaluminium chloride is 50: 1, firstly adding calcium peroxide and then adding polyaluminium chloride.
(2) Selecting non-polluted soil and gravel as in-situ covering materials to carry out heterogeneous layered covering, and repairing the bottom mud of the polluted water body. The lower layer of the cover is pollution-free soil, and the upper layer is gravel.
The selected non-polluted soil is taken from non-polluted land five kilometers near the urban area, and the bulk density is 1.4g/cm 3.
The selected grit has a particle size of 2-5mm and a bulk density of 1.37g/cm 3.
The invention is not limited to the examples, and any equivalent changes to the technical solution of the invention by a person skilled in the art after reading the description of the invention are covered by the claims of the invention.
Claims (10)
1. The method for in-situ capping of the polluted bottom mud by combining heterogeneous layered covering with chemical treatment is characterized by comprising the following steps of:
the method comprises the following steps:
(1) adding a compound chemical agent into the polluted bottom mud to reduce harmful substances;
(2) the capping material is added to the surface of the polluted bottom mud to be treated in a layered mode, so that the polluted bottom mud is isolated from the overlying water body, and the migration of pollutants in the bottom mud to the water body is reduced.
2. The heterogeneous layered cover bonding chemical treatment contaminated substrate mud in-situ capping method according to claim 1, characterized by:
and (3) after the compound medicament is added for 7 to 10 days in the step (1), carrying out capping on the polluted bottom mud in the step (2).
3. The heterogeneous layered cover bonding chemical treatment contaminated substrate mud in-situ capping method according to claim 2, characterized by:
in the step (1), the compound chemical agent is a mixture of calcium peroxide and polyaluminium chloride.
4. The heterogeneous layered cover bonding chemical treatment contaminated substrate mud in-situ capping method according to claim 3, characterized by:
in the step (1), the mass ratio of calcium peroxide to polyaluminium chloride in the composite chemical agent is 50: 1.
5. the heterogeneous layered cover bonding chemical treatment contaminated substrate mud in-situ capping method according to claim 4, characterized by:
in the step (1), the adding sequence of the composite chemical agent is that calcium peroxide is added firstly and then polyaluminium chloride is added.
6. The heterogeneous layered cover bonding chemical treatment contaminated substrate mud in-situ capping method according to claim 5, characterized by:
in the step (2), the capping material comprises a plurality of layers of materials, and each layer of material is selected from zeolite, coarse sand, fine sand, hydroxyapatite, pollution-free soil and gravel.
7. The heterogeneous layered cover bonding chemical treatment contaminated substrate mud in-situ capping method according to claim 6, characterized by:
in the step (2), the total thickness of the covering layer formed by the capping material is 8-12 cm.
8. The heterogeneous layered cover bonding chemical treatment contaminated substrate mud in-situ capping method according to claim 7, characterized by:
in the step (2), the capping material comprises a lower layer, a middle layer and an upper layer which are respectively zeolite, coarse sand and fine sand.
9. The heterogeneous layered cover bonding chemical treatment contaminated substrate mud in-situ capping method according to claim 8, characterized by:
in the step (2), the thickness ratio of the zeolite to the coarse sand to the fine sand is 1: 1: 2.
10. the heterogeneous layered cover bonding chemical treatment contaminated substrate mud in-situ capping method according to claim 9, characterized by:
in the step (2), in the process of adding the capping material, firstly adding the lower layer covering material, adding the middle layer covering material after the material is stabilized for 1 day, and adding the lower layer covering material after the material is continuously stabilized for 1 day.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113955909A (en) * | 2021-11-05 | 2022-01-21 | 安徽雷克环境科技有限公司 | Method for eluting and purifying offshore deposited pollutants |
| CN114716119A (en) * | 2022-02-28 | 2022-07-08 | 中国地质大学（武汉） | Coupling treatment method for bottom sediment conditioning and pollutant resistance control |
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| CN106554141A (en) * | 2016-11-02 | 2017-04-05 | 河海大学 | A kind of method of polluted bed mud in-situ immobilization |
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| US5387343A (en) * | 1992-08-20 | 1995-02-07 | Biochem Industrial Ltd. | Method for improving bottom and water quality in water areas and a set of agents used in the method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113955909A (en) * | 2021-11-05 | 2022-01-21 | 安徽雷克环境科技有限公司 | Method for eluting and purifying offshore deposited pollutants |
| CN114716119A (en) * | 2022-02-28 | 2022-07-08 | 中国地质大学（武汉） | Coupling treatment method for bottom sediment conditioning and pollutant resistance control |
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Application publication date: 20200717 |