CN109824140B - In-situ reinforced bioremediation method for underground water - Google Patents
In-situ reinforced bioremediation method for underground water Download PDFInfo
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- CN109824140B CN109824140B CN201811214599.3A CN201811214599A CN109824140B CN 109824140 B CN109824140 B CN 109824140B CN 201811214599 A CN201811214599 A CN 201811214599A CN 109824140 B CN109824140 B CN 109824140B
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Abstract
The invention provides an in-situ reinforced bioremediation method of underground water, which comprises the steps of arranging a remediation well, injecting aerobic biological agents into the remediation well, then sequentially aerating to finish remediation of the underground water, rapidly diffusing the aerobic biological agents into the remediation radius range of the remediation well through aeration to achieve the purpose of rapidly remedying the underground water, and clearly determining a recoverable area through arrangement of the remediation well.
Description
Technical Field
The invention relates to a soil and underground water pollution treatment technology, in particular to an underground water in-situ reinforced bioremediation method.
Background
The in-situ bioremediation technology of underground water is a remediation technology for converting pollutants into nontoxic substances by means of the biodegradation of organic pollutants in the underground water by microorganisms. The microorganisms provide nutrients and energy required by themselves by digesting the organic pollutants to decompose the organic pollutants into carbon dioxide and water. Groundwater in situ bioremediation can be divided into two categories: the first is to degrade organic pollutants by stimulating the growth and reproduction of indigenous microorganisms in the aquifer by injecting electron donors (suitable for anaerobes) or electron acceptors (suitable for aerobes), and nutrients into the aquifer. Commonly injected electron donors include lactate, emulsified vegetable oil or molasses, etc., and electron acceptors include air, oxygen or oxygen releasing compounds, etc. The second method is to inject the external artificial culture to acclimate the specific microorganism into the aquifer, and also inject the electron donor or the electron acceptor and nutrient substances to promote the growth and the propagation of the microorganism. The second method is called groundwater in-situ enhanced bioremediation technology.
In the article of groundwater in-situ bioremediation technology (urban environment and urban ecology, 2 months 2002, vol.15, No. 1), the dynamic circulation well groundwater in-situ bioremediation technology is discussed in Jinchaohui et al. 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 and oxygen through ground facilities, and then the polluted underground water 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. Aerobic microorganisms in the groundwater will acquire nutrients and oxygen and grow to degrade organic contaminants. The technical defects are that the groundwater range which can be repaired by the dynamic circulation well is difficult to determine, in addition, the groundwater needs to be extracted for treatment, the energy consumption is high, and the investment of ground facilities required to be built is large.
Suthane S. Suthersan et al, in the book "recording Engineering-Design details Second Edition," teach the technique of injecting compressed air into groundwater to encourage the growth and propagation of indigenous aerobic microorganisms in the groundwater to degrade organic contaminants. The technical defects are that the number of the original aerobic microorganisms in the underground water is limited, the underground water restoration period is long, and at least 2-3 years are needed. 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 reinforced bioremediation method of underground water. Aerobic biological bacteria are quickly diffused to the repair radius range of the repair well through aeration, so that the aim of quickly repairing underground water is fulfilled.
The purpose of the invention is realized by the following technical scheme:
an in-situ reinforced bioremediation method of underground water is characterized by comprising the following steps:
1) laying a repair well;
2) pressurizing and injecting aerobic biological agent into the repair well;
3) aerating the repair wells in turn until the quality of the underground water reaches the standard.
Further, the method for setting the repair well 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.
Further, the method also comprises the step 1 d) of arranging the monitoring well.
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 air or oxygen 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 is capable of increasing to more than 2-10 mg/L of dissolved oxygen in groundwater is determined as a restoration radius R.
Laying the monitoring well comprises: and monitoring wells are arranged on the tangency points of any two circles.
The aerobic biological agent needs to be screened and domesticated in advance, and has good biodegradation effect on pollutants to be treated.
The step 3) of sequentially circulating to aerate the repair well in turn refers to the following steps: and (3) randomly selecting N repairing wells as a group, aerating by using an air compressor or a pressure gas container in turn, injecting compressed air or oxygen into the previous repairing well for aerating for 30-90 minutes at intervals of 15-30 minutes, aerating the next repairing well after the intervals are completed, and starting the next cycle after one cycle of the N repairing wells is completed.
Compared with the prior art, the invention has the advantages that:
1) the groundwater remediation well in the technical scheme is used for both aerobic biological agents and compressed air or oxygen injection. Compressed air or oxygen rapidly diffuses the aerobic biological agent to the repair radius range of the repair well through the microbubbles. Aerobic biological bacteria grow in large quantities to reproduce and degrade pollutants, so that the aim of quickly repairing underground water 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;
3) compared with the technology of injecting compressed air by using pure underground water, the technical method injects the aerobic biological agent into the underground water repairing well, thereby greatly shortening the time for repairing the underground water.
Drawings
The following is further described with reference to the accompanying drawings:
FIG. 1 is a schematic diagram of a repair well layout in the method of the present 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 reinforced bioremediation method of underground water adopts a remediation well for 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 compressed air or oxygen 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 the distance from the monitoring well to which the dissolved oxygen of the underground water can rise to be more than 2-10 mg/L is determined as a 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) And (3) pressurizing and injecting a certain amount of aerobic biological agent into each remediation well by adopting a water pump. The aerobic biological agent has good biodegradation effect on pollutants to be treated by pre-screening and domesticating.
5) And (3) randomly selecting N repairing wells as a group, aerating by using an air compressor or a pressure gas container in turn, injecting compressed air or oxygen into each repairing well, aerating for 30-90 minutes, and intermittently lasting for 15-30 minutes. J1 aeration is carried out for 30-90 minutes, after the interval of 15-30 minutes, J2 aeration is carried out for 30-90 minutes, after the interval of 15-30 minutes, J3 aeration is carried out, and aeration is carried out in turn until JN. And aerating JN for 30-90 minutes, and after the interval of 15-30 minutes, beginning aeration by J1. And the N repairing wells are aerated in a circulating mode until the groundwater quality reaches the standard.
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 10 m;
2) after the J1 well is repaired and air is injected for 50 minutes, the dissolved oxygen of underground water of an H1 monitoring well which is 10m away from the J1 well can be increased to 5 mg/L;
3) injecting 100kg of aerobic biological agent into each restoration well by adopting a water pump in a pressurizing manner;
4) and aerating the nine underground water repair wells by using an air compressor in turn, and injecting compressed air into each repair well for aerating for 50 minutes at intervals of 30 minutes. J1 is aerated for 50 minutes, J2 is aerated for 50 minutes after 30 minutes of intermission, and the intermission is 30 minutes; so aeration is carried out alternately until J9. J9 was aerated for 50 minutes, and J1 was aerated after 30 minutes of pause. And 9 repairing wells are aerated circularly in this way until the groundwater quality reaches the standard.
Example 2
1) According to the figure 1, underground water repairing wells J1, J2 and J3. are arranged, J9 are arranged, underground water monitoring wells H1, H2, H3 and H4 are arranged, and the repairing radius is 7.5 m.
2) After the J1 well was repaired for 90 minutes, the H1 monitor well groundwater dissolved oxygen was allowed to rise to 5 mg/L7.5 m away from the J1 well.
3) And (3) injecting 80kg of aerobic biological agent into each remediation well by adopting a water pump.
4) And aerating the nine underground water restoration wells by using an air compressor in turn, and injecting compressed air into each restoration well for aeration for 90 minutes at intervals of 20 minutes. J1 is aerated for 90 minutes, J2 is aerated for 90 minutes after 20 minutes of intermission, and the intermission is 20 minutes; so aeration is carried out alternately until J9. J9 was aerated for 90 minutes, and J1 started aeration after 20 minutes of pause. And 9 repairing wells are aerated circularly in this way until the groundwater quality reaches 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 (2)
1. An in-situ reinforced bioremediation method of underground water is characterized by comprising the following steps:
1) laying a repair well;
2) pressurizing and injecting aerobic biological agent into the repair well;
3) aerating the repair wells in turn until the quality of underground water reaches the standard, and adopting compressed air or oxygen during aeration;
the method for laying the repair well 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 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: constructing a restoration well in a groundwater field to be restored, sequentially arranging a plurality of monitoring wells at equal intervals of 2m around the restoration well, and after continuously injecting compressed air or oxygen into the restoration well for 30-90 minutes, determining the distance from the farthest monitoring well to the restoration well, wherein the distance from the farthest monitoring well to the restoration well is 2-10 mg/L of dissolved oxygen in groundwater as restoration radius R;
the step 3) of sequentially circulating to aerate the repair well in turn refers to the following steps: and (3) randomly selecting N repairing wells as a group, aerating by using an air compressor or a pressure gas container in turn, injecting compressed air or oxygen into the previous repairing well for aerating for 30-90 minutes at intervals of 15-30 minutes, aerating the next repairing well after the intervals are completed, and starting the next cycle after one cycle of the N repairing wells is completed.
2. The method for in-situ enhanced bioremediation of underground water according to claim 1, wherein the aerobic biological agent is screened and acclimated in advance, and has a good biodegradation effect on pollutants to be treated.
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| CN110217899A (en) * | 2019-07-22 | 2019-09-10 | 鸿灌环境技术有限公司 | A kind of polluted underground water repairing and treating method |
| CN112299554A (en) * | 2019-07-29 | 2021-02-02 | 北京博诚立新环境科技股份有限公司 | Biological reaction well group and underground water in-situ reinforced biological reaction wall and laying method thereof |
| 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 |
| CN115784420B (en) * | 2022-09-07 | 2024-05-10 | 河北工程大学 | Device for removing pollutants in underground water in situ |
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| CN103145232A (en) * | 2012-02-21 | 2013-06-12 | 清华大学 | Method and system using micro-nanometer bubbles to repair underground water in in-situ mode |
| CN107127211A (en) * | 2017-05-27 | 2017-09-05 | 中科鼎实环境工程股份有限公司 | Pollutant site remediation system and method based on regional pollution amount |
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| US5622450A (en) * | 1995-03-24 | 1997-04-22 | Grant, Jr.; Richard P. | Pressure extraction process for removing soil and groundwater contaminants |
| US6908541B2 (en) * | 2001-10-24 | 2005-06-21 | Maxim Technologies, Inc. | Electrolytic catalytic oxidation system |
| CN101224940A (en) * | 2007-01-19 | 2008-07-23 | 广州市污水治理有限责任公司 | River sediment in-situ remediation method |
| CN102964040B (en) * | 2012-11-30 | 2014-07-09 | 南京大学 | In-situ repair method for polluted sediment nitrogen nutritive salt and in-situ repairing pile applied to in-situ repair method |
| CN102976490A (en) * | 2012-12-19 | 2013-03-20 | 天津生态城环保有限公司 | Method for in-situ bioremediation of pollution caused by chlorohydrocarbon of underwater |
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| CN104743667B (en) * | 2015-03-13 | 2017-02-01 | 环境保护部环境规划院 | Device for in-situ remediation of underground water pollution of agricultural irrigator well and method for remediation of underground water by using device |
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| CN103145232A (en) * | 2012-02-21 | 2013-06-12 | 清华大学 | Method and system using micro-nanometer bubbles to repair underground water in in-situ mode |
| CN107127211A (en) * | 2017-05-27 | 2017-09-05 | 中科鼎实环境工程股份有限公司 | Pollutant site remediation system and method based on regional pollution amount |
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