CN106629914B - Method for in-situ remediation of heavy metal polluted water body by using permeable reactive bricks and application - Google Patents
Method for in-situ remediation of heavy metal polluted water body by using permeable reactive bricks and application Download PDFInfo
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- CN106629914B CN106629914B CN201611225250.0A CN201611225250A CN106629914B CN 106629914 B CN106629914 B CN 106629914B CN 201611225250 A CN201611225250 A CN 201611225250A CN 106629914 B CN106629914 B CN 106629914B
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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
- C02F1/00—Treatment of water, waste water, or sewage
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/103—Arsenic compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
- C02F2101/22—Chromium or chromium compounds, e.g. chromates
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Abstract
The invention discloses a method for restoring heavy metal polluted water in situ by using a permeable reactive brick and application thereof, wherein the permeable reactive brick consists of a surface layer, an intermediate reactive layer and a bottom layer; the surface layer and the bottom layer are both formed by mixing coarse iron tailing sand, portland cement, coarse steel slag, broken stone and water, the middle reaction layer is formed by mixing iron-carbon micro-electrolysis ceramsite and portland cement, and the permeable reactive brick is formed by adopting a brick making machine to press and vibrate. The purification system device provided by the invention has the advantages that the mercury removal rate is 85-95%, the arsenic removal rate is 80-90%, the chromium removal rate is 80-95%, the cadmium removal rate is 85-90%, the lead removal rate is 85-95%, and the thallium removal rate is 70-85%. The method is suitable for the treatment and ecological restoration of heavy metal polluted water bodies such as heavy metal polluted farmland drainage, tailing dam flood discharge, tailing slag yard drainage and the like, and is a safe and efficient in-situ restoration technology for the heavy metal polluted water bodies.
Description
Technical Field
The invention belongs to the technical field of environmental engineering, and relates to an in-situ purification method of a heavy metal polluted water body, in particular to a method for in-situ remediation of a heavy metal polluted water body by using a permeable reactive brick and application thereof.
Background
Along with the process of urbanization and industrial and agricultural production, a large amount of untreated wastewater, waste residues and waste gas containing heavy metals are discharged into farmland environment, so that a large amount of farmland soil is polluted to different degrees. The farmland soil heavy metal pollution refers to mercury, chromium, cadmium, lead, copper, nickel, antimony, thallium, zinc and metalloid arsenic with biotoxicity, and after the mercury, chromium, cadmium, lead, copper, nickel, antimony, thallium, zinc and metalloid arsenic enter farmland soil, if the elements exist in excess for a long time, the elements not only have negative effects on the number of soil microorganisms, the population structure and the activity of soil enzymes, so that the soil fertility is reduced, but also interfere the normal metabolic process of crops, so that the yield and the quality of the crops are reduced, and finally, the elements are accumulated in a human body through a food chain, and the health and even the life of human beings are harmed.
The pollution process of heavy metals in a farmland soil system has the characteristics of concealment, long-term property and irreversibility, and the heavy metals in the farmland can be lost into rivers along with rainwater and farmland irrigation water, so that large-area river basin heavy metal pollution can be caused. At present, the restoration technology of the heavy metal polluted farmland soil mainly comprises a thermal desorption method, a soil-moving method, a stabilization/immobilization technology, a water washing method, a microbiological method, a phytoremediation method and the like. These methods either have the disadvantages of low efficiency, high cost or long repair cycle, and in addition, in most cases, the original biological environment of the soil is changed. Permeable reactive barrier (permeable reactive barrier) is a polluted water body restoration technology which is widely researched in developed countries in Europe and America at present, well developed and begins to be applied in primary commercialization. The PRB technical handbook for pollutant remediation, published by the U.S. environmental protection agency (USEPA) 1998, defines PRBs as: the active material wall is arranged underground so as to intercept the pollution pinnate body, so that after the pollution pinnate body passes through the reaction medium, the pollutant can be converted into another form which is accepted by the environment, and the aim of enabling the pollutant solubility to reach the environmental standard is fulfilled. The technology places the reaction material vertical to the flowing direction of the polluted pinnate body in the ground water, when the pinnate body flows through the reaction wall, the reaction material and the reaction material have physical, chemical and biological effects and are degraded, adsorbed, precipitated or removed, so that the polluted pinnate body is treated, the permeable reaction wall technology is mainly used for repairing the polluted ground water in the early stage, and the technology is applied to repairing the surface polluted water body to be further researched in the future.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method and a device for restoring heavy metal polluted water body in situ by using a permeable reactive brick. The invention can effectively remove heavy metals in water, and provides the following technical scheme for achieving the purpose:
a permeable reactive brick for in-situ remediation of heavy metal polluted water is characterized by consisting of a surface layer 1, an intermediate reactive layer 2 and a bottom layer 3; the surface layer and the bottom layer are both formed by mixing coarse iron tailing sand, portland cement, coarse steel slag, broken stones and water, and the middle reaction layer is formed by mixing iron-carbon micro-electrolysis ceramsite and portland cement. The surface layer and the bottom layer are both composed of the following components:
15-40 parts of coarse iron tailing sand, 0.2-0.6 mm in particle size, 5-10 parts of portland cement
20-30 parts of coarse steel slag with the grain diameter of 0.2-0.4 mm and 10-30 parts of broken stone with the grain diameter of 1.0-5.0 mm;
the intermediate reaction layer consists of 80-90 parts of iron-carbon micro-electrolysis ceramsite with the grain diameter of 3.0-12.0 mm and 10-20 parts of Portland cement.
The permeable reactive brick is formed by pressing and vibrating a baking-free brick machine, and is cured to prepare the reactive brick which has high compressive strength and good water permeability and can effectively remove mercury, arsenic, chromium, cadmium, lead, thallium and other heavy metals in polluted water.
The surface layer, the intermediate reaction layer and the bottom layer of the reaction brick have the same size, and the reaction brick is prepared by pressing and vibrating a baking-free brick machine. The materials used for the surface layer and the bottom layer of the reaction brick are all formed by mixing coarse iron tailing sand, portland cement, coarse steel slag, broken stone and water. The intermediate reaction layer is formed by mixing iron-carbon micro-electrolysis ceramsite and portland cement.
The invention further discloses a using method of the permeable reactive bricks for in-situ remediation of the heavy metal polluted water body, which is characterized in that the permeable reactive bricks are built as revetments around the polluted water body or a reactive wall body is directly arranged in the polluted water body during implementation, the system can exert stronger pollutant removal capacity, and the monitoring system has the advantages of 85-95% of mercury removal rate, 80-90% of arsenic removal rate, 80-95% of chromium removal rate, 85-90% of cadmium removal rate, 85-95% of lead removal rate and 70-85% of thallium removal rate in the water body.
The invention further discloses application of the permeable reactive brick for in-situ remediation of the heavy metal polluted water body in treatment and ecological restoration of the heavy metal polluted farmland drainage, tailing dam flood discharge and tailing pond drainage heavy metal polluted water body. The experimental results show that: the permeable reactive brick for in-situ remediation of the heavy metal polluted water body prepared by the invention can effectively remove pollutants such as mercury, arsenic, chromium, cadmium, lead, thallium and the like in the water body.
The invention further discloses a using method of the permeable reactive bricks, which is characterized in that the permeable reactive bricks are built as revetments for heavy metal polluted farmlands, tailing dams, lakes, rivers and the like during implementation, wherein when polluted water bodies seep through the reactive brick walls, the iron-carbon micro-electrolysis ceramsite in the reaction layer effectively removes heavy metals in sewage, and the concentration of the heavy metals in the effluent reaches the standard. The monitoring result shows that: the system has the advantages that the mercury removal rate of the system to the water body is 85-95%, the arsenic removal rate is maintained at 80-90%, the chromium removal rate is 80-95%, the cadmium removal rate is 85-90%, the lead removal rate is 85-95%, and the thallium removal rate is 70-85%.
The permeable reactive brick for in-situ remediation of the heavy metal polluted water body disclosed by the invention has the beneficial effects that:
(1) The method and the device for restoring the heavy metal polluted water body in situ by the permeable reactive brick can economically and effectively remove the heavy metal in the runoff of the farmland, and can also be used as an emergency device to be applied to projects such as tailing dam flood discharge water purification, tailing slag slope protection and the like, thereby controlling the loss of the heavy metal in the water body and preventing large-area heavy metal non-point source pollution.
(2) The system device for in-situ remediation of the heavy metal polluted water body can be directly applied to a heavy metal polluted river channel or lake, and can effectively purify the heavy metal in the water body when the water body flows through the wall body of the reaction brick by building the wall body constructed by the permeable reaction brick in the water body.
Drawings
FIG. 1 is a schematic view of a device for in-situ remediation of a heavy metal polluted water body by using a permeable reactive brick according to the invention;
reference numbers in the figures: 1 is a surface layer, 2 is a middle reaction layer, and 3 is a bottom layer.
Detailed Description
The method and the device for restoring the heavy metal polluted water body in situ by the permeable reactive bricks are described in detail below by combining the attached drawings and the embodiment. The reagents and raw materials used in the present invention are commercially available, such as coarse iron tailings, portland cement, and coarse steel slag.
Example 1
The permeable reactive brick for in-situ remediation of the heavy metal polluted water body consists of a surface layer, an intermediate reactive layer and a bottom layer. The surface layer and the bottom layer are both composed of 35 parts of coarse iron tailing sand, 5 parts of portland cement, 30 parts of coarse steel slag and 30 parts of crushed stone, the middle reaction layer is composed of 90 parts of iron-carbon micro-electrolysis ceramsite and 10 parts of portland cement, the proportioned materials are molded by a vibration type brick making machine through pressurization and vibration, the specification is 240 multiplied by 115 multiplied by 90 millimeters, and the reaction brick with high compressive strength and good water permeability is prepared after maintenance.
When the permeable reaction brick is used as a bank protection of a mercury-polluted farmland, and a mercury-polluted water body in the farmland permeates through the bank protection built by the reaction bricks, the permeable reaction brick and the iron-carbon micro-electrolysis ceramsite in the middle of the reaction bricks are subjected to adsorption and ion exchange reactions, so that the mercury concentration in the water body is effectively reduced, and the removal rate is up to more than 85%.
Example 2
The permeable reactive brick for in-situ remediation of the heavy metal polluted water body is characterized by consisting of a surface layer, an intermediate reactive layer and a bottom layer; the surface layer and the bottom layer are both formed by mixing coarse iron tailing sand, portland cement, coarse steel slag, broken stones and water, and the middle reaction layer is formed by mixing iron-carbon micro-electrolysis ceramsite and portland cement. The surface layer and the bottom layer are both composed of the following components:
40 portions of coarse iron tailing sand with the grain diameter of 0.2 mm and 10 portions of Portland cement
30 parts of coarse steel slag with the grain size of 0.4 mm, and 20 parts of broken stone with the grain size of 1.0 mm;
the intermediate reaction layer consists of 85 parts of iron-carbon micro-electrolysis ceramsite with the particle size of 3.0 mm and 15 parts of portland cement.
Example 3
The permeable reactive brick for in-situ remediation of the heavy metal polluted water body is characterized by consisting of a surface layer, an intermediate reactive layer and a bottom layer; the surface layer and the bottom layer are both formed by mixing coarse iron tailing sand, portland cement, coarse steel slag, broken stone and water, and the middle reaction layer is formed by mixing iron-carbon micro-electrolysis ceramsite and portland cement. The surface layer and the bottom layer are both composed of the following components:
30 portions of coarse iron tailing sand with the grain diameter of 0.6 mm and 10 portions of Portland cement
30 parts of coarse steel slag with the grain size of 0.4 mm and 30 parts of broken stone with the grain size of 5.0 mm;
the intermediate reaction layer consists of 90 parts of iron-carbon micro-electrolysis ceramsite with the particle size of 12.0 mm and 10 parts of portland cement.
Example 4
At the end of a chromium-polluted ditch of Tianjin, a permeable reactive brick wall is constructed, and the water inlet and outlet of the system are monitored, and the result shows that the removal rate of Cr (VI) in a water body by the system is 90 percent, the mechanism is redox and coprecipitation reaction, and the product is mainly Fe (OH) 3 、Cr(OH) 3 The system can rapidly and effectively remove Cr (VI) in the polluted water body and effectively prevent the chromium-polluted water body from causing non-point source pollution.
Example 5
In a stream polluted by lead tailings in Guizhou, the concentration of lead in upstream and downstream water bodies of the stream is monitored by constructing permeable reaction brick walls in sections, and the result shows that the removal rate of the system to lead in the water body is 90 percent, the removal mechanism is redox and coagulation adsorption, and the products are Pb (0) and Pb (OH) 2 The iron-carbon micro-electrolysis ceramsite reaction brick is adopted, so that the lead pollution of a water basin can be effectively prevented.
Example 6
The periphery of an arsenic slag storage yard in Guizhou is provided with a permeable reaction brick device, water bodies inside and outside the slag storage yard are monitored, the result shows that the removal rate of arsenic in the water bodies by the system is 85%, and the iron-carbon microelectrolysis ceramsite reaction brick device can effectively prevent arsenic in the water bodies flowing out of the slag from being purified and prevent the influence of the arsenic in the slag yard on the external environment.
In summary, the disclosure of the present invention is not limited to the embodiments, and persons skilled in the art can easily set forth other embodiments within the technical teaching of the present invention, but such embodiments are included in the scope of the present invention.
Claims (5)
1. A permeable reactive brick for in-situ remediation of heavy metal polluted water is characterized by consisting of a surface layer, an intermediate reactive layer and a bottom layer; the surface layer and the bottom layer are both formed by mixing coarse iron tailing sand, portland cement, coarse steel slag, broken stones and water, the middle reaction layer is formed by mixing iron-carbon micro-electrolysis ceramsite and portland cement, and when a heavy metal polluted water body seeps through the reaction brick, the iron-carbon micro-electrolysis ceramsite in the reaction layer can effectively purify mercury, arsenic, chromium, cadmium, lead and thallium heavy metals in the polluted water body; the surface layer and the bottom layer are both composed of the following components:
15-40 parts of coarse iron tailing sand, 0.2-0.6 mm in particle size, 5-10 parts of portland cement
20-30 parts of coarse steel slag with the grain diameter of 0.2-0.4 mm and 10-30 parts of broken stone with the grain diameter of 1.0-5.0 mm;
the intermediate reaction layer consists of 80-90 parts of iron-carbon micro-electrolysis ceramsite with the grain diameter of 3.0-12.0 mm and 10-20 parts of Portland cement.
2. The permeable reactive brick for in-situ remediation of heavy metal contaminated water according to claim 1, wherein the reactive brick is manufactured by pressing and vibrating a baking-free brick machine, and the sizes of the surface layer, the intermediate reactive layer and the bottom layer of the reactive brick are consistent.
3. The permeable reaction brick for in-situ remediation of heavy metal contaminated water according to claim 1, wherein the reaction brick comprises an intermediate reaction layer for purification of heavy metals in the water, and the intermediate reaction layer is formed by mixing iron-carbon micro-electrolysis ceramsite and portland cement.
4. The use method of the permeable reactive brick for in-situ remediation of the heavy metal polluted water body as claimed in claim 1, wherein the permeable reactive brick is built as a revetment around the polluted water body or a reactive wall is directly arranged in the polluted water body, the system has a strong capability of removing pollutants, and the monitoring system has a mercury removal rate of 85-95%, an arsenic removal rate of 80-90%, a chromium removal rate of 80-95%, a cadmium removal rate of 85-90%, a lead removal rate of 85-95%, and a thallium removal rate of 70-85% on the water body.
5. The permeable reactive brick for in-situ remediation of heavy metal polluted water according to claim 1 is applied to treatment and ecological restoration of heavy metal polluted farmland drainage, tailing dam flood discharge and tailing yard drainage heavy metal polluted water.
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| CN109928579A (en) * | 2019-04-09 | 2019-06-25 | 陕西科技大学 | A kind of haptoreaction wall and method handling landfill leachate |
| CN112537855A (en) * | 2019-09-20 | 2021-03-23 | 上海聚蓝水处理科技有限公司 | Method, device and system for removing lead in water and application of metal medium |
| CN114230025B (en) * | 2022-01-13 | 2023-03-31 | 重庆大学 | Small permeable reactive barrier system and method for simple landfill soil medium-current remediation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104961201A (en) * | 2015-07-14 | 2015-10-07 | 山东理工大学 | Preparation method of iron-carbon micro-electrolysis ceramsite filler for water treatment |
| CN105253962A (en) * | 2015-10-09 | 2016-01-20 | 昆明理工大学 | Preparation method and application of arsenic removal agent |
| CN105854784A (en) * | 2015-01-19 | 2016-08-17 | 中国科学院过程工程研究所 | Method for preparing environmental protection material used for sewage treatment by reforming metallurgical dregs |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105854784A (en) * | 2015-01-19 | 2016-08-17 | 中国科学院过程工程研究所 | Method for preparing environmental protection material used for sewage treatment by reforming metallurgical dregs |
| CN104961201A (en) * | 2015-07-14 | 2015-10-07 | 山东理工大学 | Preparation method of iron-carbon micro-electrolysis ceramsite filler for water treatment |
| CN105253962A (en) * | 2015-10-09 | 2016-01-20 | 昆明理工大学 | Preparation method and application of arsenic removal agent |
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Effective date of registration: 20230522 Address after: 300191 No. 17, rehabilitation Road, Tianjin, Nankai District Patentee after: Tianjin Academy of ecological and Environmental Sciences (Tianjin Academy of environmental planning, Tianjin low carbon development research center) Address before: 300192 No. 17, rehabilitation Road, Tianjin, Nankai District Patentee before: TIANJIN ACADEMY OF ENVIRONMENTAL SCIENCES |