CN109292974B - In-situ anaerobic biological remediation method for underground water and aquifer soil - Google Patents
In-situ anaerobic biological remediation method for underground water and aquifer soil Download PDFInfo
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- CN109292974B CN109292974B CN201811503626.9A CN201811503626A CN109292974B CN 109292974 B CN109292974 B CN 109292974B CN 201811503626 A CN201811503626 A CN 201811503626A CN 109292974 B CN109292974 B CN 109292974B
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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
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/28—Anaerobic digestion processes
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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
- B09C1/002—Reclamation of contaminated soil involving in-situ ground water treatment
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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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
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/06—Nutrients for stimulating the growth of microorganisms
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Abstract
The invention provides an in-situ anaerobic bioremediation method for underground water and aquifer soil, which injects nutrient substances or can be used as an electron donor into a remediation well by arranging the remediation well, and supplements and injects electron donors such as sulfate or nitrate and the like when necessary. And then, injecting domesticated anaerobic biological bacteria, and injecting compressed gas to quickly diffuse nutrient substances, electron donors or anaerobic biological bacteria into the repair radius range of the repair well, so that the aim of quickly and anaerobically repairing underground water and aquifer soil is fulfilled, and meanwhile, the repairable area can be clearly determined by arranging the repair well.
Description
Technical Field
The invention relates to a soil and underground water pollution treatment technology, in particular to an in-situ anaerobic biological remediation method for underground water and aquifer soil.
Background
The in-situ bioremediation technology of underground water and aquifer soil is a remediation technology for converting pollutants into nontoxic substances by means of the biodegradation of microorganisms on organic pollutants in the underground water and the aquifer soil. Microorganisms degrade organic pollutants by direct or co-metabolism to less toxic pollutants or completely to carbon dioxide and water. The in-situ bioremediation technology can be divided into an in-situ aerobic bioremediation technology and an in-situ anaerobic bioremediation technology according to aerobic or anaerobic characteristics of biological bacteria. Contaminants such as carbon tetrachloride, chloroform, tetrachloroethylene, and trichloroethylene are difficult to degrade by aerobic organisms, but can be degraded by anaerobic organisms.
The U.S. environmental protection agency discusses techniques for In Situ Bioremediation of groundwater from dynamic circulation wells In the book of Engineered Applications to In Situ Bioremediation of Chlorinated solutions, Fundamentals and Field Applications (EPA 542-R-00-008, July 2000 revised). According to the technology, an extraction well is arranged at the upper stream of underground water, polluted underground water is extracted and added with nutrient substances or microbial inoculum through ground facilities, and then is reinjected into a reinjection well arranged at the lower stream of the underground water, so that the dynamic circulation of the underground water is formed. Microorganisms in the groundwater will grow and multiply after obtaining nutrients to degrade organic contaminants. The technology has the disadvantages that the groundwater range which can be repaired by the dynamic circulation well is difficult to determine; in addition, the underground water needs to be extracted for treatment, the energy consumption is high, and the investment of ground facilities required to be built is large. Additionally, this book does not discuss how groundwater injection wells are laid out on a flat surface.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides an in-situ anaerobic bioremediation method for underground water and aquifer soil. According to the bioremediation method, through arrangement of the remediation wells, nutrient substances are injected into the remediation wells, sulfate or nitrate and other electron donors are added if necessary, and then domesticated anaerobic biological bacteria can be injected, and the nutrient substances, the electron donors or the anaerobic biological bacteria are quickly diffused into the remediation radius range of the remediation wells through injection of compressed nitrogen, argon or carbon dioxide for aeration, so that the purpose of quickly and anaerobically remedying the underground water and the aquifer soil is achieved, and meanwhile through arrangement of the remediation wells, a repairable area can be clearly determined.
The purpose of the invention is realized by the following technical scheme:
an in-situ anaerobic bioremediation method for underground water and aquifer soil is characterized by comprising the following steps:
1) laying a repairing well group;
2) injecting nutrient substances into the repair well under pressure;
3) injecting target pollutants of underground water and aquifer soil into the remediation well to domesticate anaerobic biological bacteria;
4) nutrient substances are injected into each repairing well in an intermittent small dosage manner, so that the concentration of the nutrient substances in the underground water reaches more than 2mg/L, and the operation is continued until the underground water and the aquifer soil reach the standard.
When the nutrient substances are injected under pressure in the repair well, sulfate or nitrate is also injected under pressure as an electron donor if necessary.
After injecting the substance in steps 2), 3) and 4), injecting gas through the repair well so that the injected substance is diffused to the peripheral underground aquifer.
The nutrient is lactate, acetate, vegetable oil or molasses, and the nutrient can also be used as an electron donor.
The gas is compressed nitrogen, argon or carbon dioxide.
The remediation well is used for pressurized injection of both nutrients and anaerobic organisms and for pressurized injection of gas.
The well group of the repair well is laid and comprises the following steps:
1a) determining a repair radius R;
1b) four repairing wells are arranged in a field to be repaired, so that a regular quadrangle with the side length of 2R is formed among the four repairing wells, and a repairing well is arranged in the center of each regular quadrangle;
1c) arranging other repair wells in sequence according to the method of the step 1 b) so that the intersection of all circles covers the site to be repaired, wherein the circle is a circle with the repair well as the center and the radius of the circle is the repair radius R.
Still further, step 1 d) laying monitoring wells.
The method for determining the repair radius R comprises the following steps: a restoration well is built in a groundwater field to be restored, a plurality of monitoring wells are sequentially arranged around the restoration well at equal intervals of 2m, and after compressed nitrogen is continuously injected into the restoration well for 30-90 minutes, the distance from the monitoring well which is farthest from the restoration well and has the concentration of dissolved nitrogen in groundwater rising to more than 1mg/L is determined as restoration radius R.
Laying the monitoring well comprises: and monitoring wells are arranged on the tangency points of any two circles.
Compared with the prior art, the invention has the advantages that:
1) the groundwater remediation well in the technical scheme is used for injecting nutrient substances (or serving as electron donors) such as lactate, acetate, vegetable oil or molasses and the like, electron donors such as sulfate or nitrate and anaerobic organisms under pressure, and is also used for injecting inert gases such as compressed nitrogen, argon or carbon dioxide and the like under pressure to quickly diffuse the substances into a groundwater aquifer around the remediation well. The anaerobic biological bacteria grow and propagate in large quantities to degrade pollutants, so that the aim of quickly repairing underground water and aquifer soil is fulfilled;
2) the groundwater in-situ bioremediation technology of the dynamic circulating wells is difficult to determine the groundwater range which can be remedied by each pair of dynamic circulating wells, the invention can clearly determine that the groundwater remediation wells are taken as the center, and the intersection of circles with the radius of the remediation radius covers the groundwater pollution area to be remedied. In addition, the dynamic circulation well underground water in-situ bioremediation technology needs to extract underground water for treatment, so that the energy consumption is high, and the investment of ground facilities required to be built is large. The technology does not need to build ground water treatment facilities.
Drawings
The following is further described with reference to the accompanying drawings:
FIG. 1 is a schematic layout of a remediation well cluster for use in the method of the invention.
Detailed Description
The method and effect of the present invention will be further described in detail with reference to the accompanying drawings and specific embodiments.
An in-situ anaerobic bioremediation method for groundwater and aquifer soil, which adopts a remediation well to carry out remediation and comprises the following steps:
1) a restoration well J1 is built in a groundwater field to be restored, monitoring wells are distributed at intervals of 2m, 4m, 6m. And after the compressed nitrogen is continuously injected into the repair well J1 for 30-90 minutes, the distance from the monitoring well which is farthest from the repair well and can be increased to more than 1mg/L by the dissolved nitrogen in the underground water is determined as the repair radius R.
2) As shown in figure 1, a repair well J2 is arranged at a position with a distance of 2R at any position of a repair well J1, and a square is constructed by taking J1 and J2 as vertexes. Laying a repair well J7 and a repair well J8 at the other two vertex positions of the square; a repair well J4 is deployed in the center of this square. In practice, four remediation wells J1, J2, J7 and J8 are centered, four circles of remediation radius R are tangent, and the geometric center of the void formed in the middle is the location of the fifth remediation well J4.
3) And (4) sequentially laying other repair wells according to the method, so that the intersection of circles taking the repair wells as centers and the radius as the repair radius covers the underground water pollution area to be repaired. And underground water monitoring wells can be arranged at the intersection points of any two circles to monitor the underground water remediation effect.
4) A certain amount of nutrients (or also used as electron donors) such as lactate, acetate, vegetable oil or molasses and the like are injected into each restoration well in a pressurizing manner by a water pump, and the nutrients are rapidly diffused into underground water aquifers around the restoration wells by injecting compressed nitrogen, argon or carbon dioxide into each restoration well. If necessary, a certain amount of electron donors such as sulfate or nitrate are injected into each restoration well under pressure, and the sulfate or nitrate is rapidly diffused into the groundwater aquifer around the restoration well by injecting inert gases such as compressed nitrogen, argon or carbon dioxide.
5) In order to quickly achieve the restoration effect, a water pump can be adopted to pressurize and inject a certain amount of anaerobic biological agents into each restoration well. The anaerobic biological agent has good biodegradation effect on pollutants to be treated by pre-screening and domesticating. Injecting compressed nitrogen, argon or carbon dioxide and other inert gases into each repair well to quickly diffuse the anaerobic organisms into the groundwater aquifer around the repair well.
6) Each repairing well is indirectly injected with nutrients (or also used as an electron donor) such as lactate, acetate, vegetable oil or molasses in a small-dosage pressurization manner, and the nutrients are rapidly diffused by injecting inert gases such as compressed nitrogen, argon or carbon dioxide, so that the concentration of the nutrients in the underground water reaches more than 2 mg/L.
7) The indigenous anaerobic biological bacteria in the groundwater aquifer or injected anaerobic biological bacteria grow in a large quantity to degrade pollutants to be treated until the groundwater and the aquifer soil reach the standard.
Specific examples are provided below
Example 1
1) As shown in fig. 1, underground water restoration wells J1, J2 and J J3... J9 are arranged, underground water monitoring wells H1, H2, H3 and H4 are arranged, and the restoration radius is 8 m;
2) after the J1 well is repaired and compressed nitrogen is injected for 30 minutes, the water-soluble nitrogen of the H1 monitoring well underground at a distance of 8m from the J1 well can be increased to 1 mg/L;
3) and (3) injecting 80L of sodium lactate saturated solution into each repair well by adopting a water pump under pressure, and continuously injecting compressed nitrogen for 30 minutes to quickly diffuse sodium lactate into the groundwater aquifer around the repair well.
4) 100L of anaerobic biological bacteria liquid is injected into each restoration well under pressure by a water pump, compressed nitrogen is continuously injected for 30 minutes, and the anaerobic biological bacteria is quickly diffused into underground water aquifers around the restoration wells.
5) After continuously injecting a saturated solution of sodium lactate at a flow rate of 100L per hour for 30 minutes under pressure into each repair well, compressed nitrogen gas was continuously injected for 30 minutes, and then sodium lactate was injected under pressure again at intervals of 12 hours. By circulating in this way, the sodium lactate concentration in the underground water monitoring wells H1, H2, H3 and H4 is maintained to be more than 2 mg/L. Until the underground water and the aquifer soil reach the standard.
Example 2
1) As shown in fig. 1, underground water restoration wells J1, J2 and J J3... J9 are arranged, underground water monitoring wells H1, H2, H3 and H4 are arranged, and the restoration radius is 12 m;
2) after the J1 well is repaired and compressed nitrogen is injected for 50 minutes, the water-soluble nitrogen of the H1 monitoring well which is 12m away from the J1 well can be enabled to be dissolved by the water and then rise to 1 mg/L;
3) and (3) injecting 120L of sodium lactate saturated solution into each repair well by adopting a water pump under pressure, and continuously injecting compressed nitrogen for 50 minutes to quickly diffuse sodium lactate into the groundwater aquifer around the repair well.
4) And (3) pressurizing and injecting 150L of anaerobic biological bacteria liquid into each remediation well by adopting a water pump, continuously injecting compressed nitrogen for 50 minutes, and quickly diffusing the anaerobic biological bacteria liquid into the underground water aquifer around the remediation well.
5) After continuously injecting a sodium lactate saturated solution into each repair well at a flow rate of 200L per hour for 30 minutes under pressure, compressed nitrogen is continuously injected for 50 minutes, and then sodium lactate is injected under pressure after 12 hours of intermission. By circulating in this way, the sodium lactate concentration in the underground water monitoring wells H1, H2, H3 and H4 is maintained to be more than 2 mg/L. Until the underground water and the aquifer soil reach the standard.
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (5)
1. An in-situ anaerobic bioremediation method for underground water and aquifer soil is characterized by comprising the following steps:
1) laying a repairing well group;
2) injecting nutrient substances into the repair well under pressure;
3) injecting target pollutants of underground water and aquifer soil into the remediation well to domesticate anaerobic biological bacteria;
4) nutrient substances are injected into each repairing well in an intermittent small dosage manner, so that the concentration of the nutrient substances in the underground water reaches more than 2mg/L, and the operation is continued until the underground water and the aquifer soil reach the standard;
injecting gas through the repair well after injecting the substances in the steps 2), 3) and 4) so that the injected substances are diffused to the peripheral underground aquifer;
the gas is compressed nitrogen, argon or carbon dioxide;
the repair well is used for pressurizing and injecting nutrient substances and anaerobic biological bacteria and also used for pressurizing and injecting gas;
the method comprises the following steps of:
1a) determining a repair radius R;
1b) four repairing wells are arranged in a field to be repaired, so that a regular quadrangle with the side length of 2R is formed among the four repairing wells, and a repairing well is arranged in the center of each regular quadrangle;
1c) arranging other repair wells successively according to the method of the step 1 b) to enable the intersection of all circles to cover the site to be repaired, wherein the circles are circles taking the repair wells as centers and the radius of the repair circles as the repair radius R;
the method for determining the repair radius R comprises the following steps: a restoration well is built in a groundwater field to be restored, a plurality of monitoring wells are sequentially arranged around the restoration well at equal intervals of 2m, and after compressed nitrogen is continuously injected into the restoration well for 30-90 minutes, the distance from the monitoring well which is farthest from the restoration well and has the concentration of dissolved nitrogen in groundwater rising to more than 1mg/L is determined as restoration radius R.
2. An in situ anaerobic bioremediation method of groundwater and aquifer soil according to claim 1, wherein sulfate or nitrate is injected under pressure as an electron donor when necessary while nutrient substances are injected under pressure in the remediation well.
3. The method for in situ anaerobic bioremediation of groundwater and aquifer soil according to claim 1, wherein the nutrient is lactate, acetate, vegetable oil or molasses, and the nutrient may also serve as an electron donor.
4. The method for in situ anaerobic bioremediation of groundwater and aquifer soil according to claim 1, further comprising the step of 1 d) laying monitoring wells.
5. The method of claim 1, wherein the deploying of the monitoring well comprises: and monitoring wells are arranged on the tangency points of any two circles.
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| CN114632809B (en) * | 2022-03-18 | 2023-04-18 | 中国科学院南京土壤研究所 | Risk control method for polluted site and in-situ risk control domain of polluted site |
| CN114653737A (en) * | 2022-04-02 | 2022-06-24 | 北京博诚立新环境科技股份有限公司 | In-situ chemical reduction and enhanced biological combined remediation method for hexavalent chromium contaminated soil and underground water |
| CN117602742B (en) * | 2023-12-15 | 2024-06-04 | 广东省环境科学研究院 | Groundwater pollution restoration system and restoration method |
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| BRPI0705607A2 (en) * | 2007-09-05 | 2009-05-05 | Rhodia Poliamida E Especialidades Ltda | bioremediation process of soils and / or waters contaminated by organic and / or inorganic compounds |
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| CN1689989A (en) * | 2004-04-23 | 2005-11-02 | 中国科学院生态环境研究中心 | Denitrogenation technique for waste water containing high concentration ammonia nitrogen |
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