CN112661311A - Groundwater remediation method - Google Patents
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Abstract
The invention belongs to the technical field of underground water treatment, and particularly relates to an underground water remediation method. The groundwater remediation method provided by the invention comprises the following steps: 1) injecting ozone into an underground water-bearing layer through an ozone channel in the integrated double-channel injection well, then injecting hydrogen peroxide into the underground water-bearing layer through a medicament channel in the integrated double-channel injection well, and finally injecting the fly ash slurry into the underground water-bearing layer through the medicament channel in the integrated double-channel injection well; 2) and (3) repeating the operation of the step 1) until the groundwater quality meets the standard requirement. The groundwater remediation method provided by the invention is low in cost, and can greatly improve the removal efficiency of groundwater organic pollutants.
Description
Technical Field
The invention belongs to the technical field of underground water treatment, and particularly relates to an underground water remediation method.
Background
At present, the common groundwater remediation technology for the polluted site comprises two main types of ectopic remediation and in-situ remediation, which determines that the remediation equipment for the polluted site is also divided into an in-situ remediation device and an ectopic remediation device. In-situ repair technology has been widely used in recent years due to the obvious disadvantages of secondary pollution in the course of ectopic treatment.
The in-situ treatment technology is a hotspot of research on groundwater pollution treatment technology, not only is the treatment cost relatively saved, but also surface treatment facilities can be reduced, the exposure of pollutants is reduced to the greatest extent, the disturbance to the environment is reduced, and the method is a groundwater pollution treatment technology with a very promising prospect. Since the middle of the 80 s in the united states, a great deal of capital has been invested in-situ soil and groundwater remediation, and some new in-situ remediation techniques, such as in-situ chemical oxidation and in-situ vapor extraction, have come into force. The in-situ chemical oxidation technology is to add a chemical oxidant into soil through an in-situ remediation device to enable the chemical oxidant to react with pollutants, so that the pollutants are removed and purified, however, the existing in-situ chemical oxidation technology needs to inject a large amount of oxidant into a soil layer, so that the cost is high, and the removal efficiency of organic pollutants in underground water is low.
In view of this, there is an urgent need to develop a groundwater remediation method with low cost and high efficiency of removing organic pollutants from groundwater.
Disclosure of Invention
Therefore, the invention aims to solve the technical problems of higher cost and lower removal efficiency of organic pollutants in underground water of the existing underground water in-situ remediation method, and further provides the underground water remediation method.
Therefore, the technical proposal adopted by the application is that,
a groundwater remediation method comprises the following steps:
1) injecting ozone into an underground water-bearing layer through an ozone channel in the integrated double-channel injection well, then injecting hydrogen peroxide into the underground water-bearing layer through a medicament channel in the integrated double-channel injection well, and finally injecting the fly ash slurry into the underground water-bearing layer through the medicament channel in the integrated double-channel injection well;
2) and (3) repeating the operation of the step 1) until the groundwater quality meets the standard requirement.
Preferably, in the step 2), the injection of the fly ash slurry into the underground aquifer is stopped after the operation of the step 1) is repeated for 1 to 5 times. In the invention, the times of injecting the fly ash slurry into the underground aquifer are 1-5 times, the injection flow rate of the fly ash slurry is 0.01-0.1L/h each time, and the injection time of the fly ash slurry is 20-40 min. And after the fly ash slurry is repeatedly injected into the underground aquifer for 1-5 times, stopping injecting the fly ash slurry into the underground aquifer, injecting ozone into the underground aquifer only through an ozone channel in the integrated double-channel injection well, then injecting hydrogen peroxide into the underground aquifer through a medicament channel in the integrated double-channel injection well, and repeating the operation until the quality of the underground water meets the standard requirement.
Preferably, the injection flow rate of the ozone is 100-300g/h, the injection flow rate of the hydrogen peroxide is 0.5-5L/h, and the injection flow rate of the fly ash slurry is 0.01-0.1L/h.
Preferably, the ozone injection time is 20-40min, the hydrogen peroxide injection time is 20-40min, and the fly ash slurry injection time is 20-40 min.
Preferably, the operation of the step 1) is repeated at intervals of 1-3 hours after the fly ash slurry is injected into the underground aquifer until the groundwater quality meets the standard requirement.
Optionally, after the fly ash slurry is repeatedly injected into the underground aquifer for 1-5 times, the injection of the fly ash slurry into the underground aquifer is stopped, at this time, ozone is injected into the underground aquifer only through an ozone channel in the integrated double-channel injection well, then, hydrogen peroxide is injected into the underground aquifer through a medicament channel in the integrated double-channel injection well, and after the hydrogen peroxide is injected into the underground aquifer, the operation is repeated at an interval of 1-3 hours until the quality of the underground water meets the standard requirement.
Preferably, the preparation method of the fly ash slurry comprises the following steps: mixing the fly ash and the montmorillonite, soaking the mixture in hydrogen peroxide, filtering after soaking, roasting a filter cake, crushing the roasted filter cake, and mixing the crushed filter cake with water to prepare fly ash slurry.
Preferably, the mass ratio of the fly ash to the montmorillonite is 1: (0.05-0.2);
the soaking temperature is 20-30 ℃, the soaking time is 0.5-2h, the roasting temperature is 300-400 ℃, and the roasting time is 0.5-2 h.
Preferably, the mass concentration of the hydrogen peroxide is 4-40%, and the mass concentration of the fly ash in the fly ash slurry is 10-15%.
Preferably, the first and second liquid crystal materials are,
the integrated double-channel injection well comprises an ozone channel and a medicament channel which are mutually independent, wherein one ends of the ozone channel and the medicament channel are respectively provided with an aeration head, the aeration head of the ozone channel is communicated with an ozone injection valve, the aeration head of the medicament channel is communicated with the medicament injection valve, the aeration head of the ozone channel and the aeration head of the medicament channel are filled with a water stop material, and the aeration head of the ozone channel is positioned below the aeration head of the medicament channel.
Preferably, the ozone generator further comprises an air compression device, an air storage device, an oxygen generation device, an oxygen storage device and an ozone manufacturing device which are sequentially connected, wherein an ozone outlet of the ozone manufacturing device is connected with the ozone injection valve.
Preferably, the device further comprises a medicament storage device, and a medicament outlet of the medicament storage device is connected with the medicament injection valve.
The technical scheme of the invention has the following advantages:
1) the groundwater remediation method provided by the invention comprises the following steps: injecting ozone into an underground water-bearing layer through an ozone channel in the integrated double-channel injection well, then injecting hydrogen peroxide into the underground water-bearing layer through a medicament channel in the integrated double-channel injection well, and finally injecting the fly ash slurry into the underground water-bearing layer through the medicament channel in the integrated double-channel injection well; and (3) repeating the operation of the step 1) until the groundwater quality meets the standard requirement. According to the invention, the ozone, the hydrogen peroxide and the fly ash slurry are injected into the underground aquifer in sequence, hydroxyl radicals generated by the ozone and the hydrogen peroxide in the underground aquifer efficiently and environmentally degrade organic pollutants in the underground water, meanwhile, the fly ash in the fly ash slurry contains various metal elements and can catalyze the decomposition of the hydrogen peroxide, and the specific porous structure of the fly ash can effectively adsorb the organic pollutants. The groundwater remediation method provided by the invention has the advantages of low cost and simple equipment, and can effectively improve the remediation efficiency and avoid secondary pollution of groundwater.
2) The invention provides a groundwater remediation method, and further provides a preparation method of the fly ash slurry, which comprises the following steps: mixing the fly ash and the montmorillonite, soaking the mixture in hydrogen peroxide, filtering after soaking, roasting a filter cake, crushing the roasted filter cake, and mixing the crushed filter cake with water to prepare fly ash slurry. According to the invention, montmorillonite is added into the fly ash, the fly ash and the montmorillonite are soaked in hydrogen peroxide, and then are roasted after soaking, and the fly ash slurry obtained by mutually matching several steps and the combined action of ozone and hydrogen peroxide can greatly improve the remediation efficiency of underground water organic pollutants.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of an apparatus for groundwater remediation according to the present invention;
FIG. 2 is a schematic diagram of an integrated dual channel injection well configuration;
wherein the reference numerals are represented as:
1. an ozone channel; 2. a medicament channel; 3. an aeration head of the ozone channel; 4. an aerator of the medicament channel; 5. and (4) quartz sand.
Detailed Description
The technical solutions of the present invention are described clearly and completely below, and it is obvious that the described embodiments are some, not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
As shown in fig. 1, the present embodiment provides a groundwater remediation method, including the following steps:
1) injecting ozone into an underground water-bearing layer through an ozone channel in the integrated double-channel injection well, then injecting hydrogen peroxide into the underground water-bearing layer through a medicament channel in the integrated double-channel injection well, and finally injecting the fly ash slurry into the underground water-bearing layer through the medicament channel in the integrated double-channel injection well;
2) and (3) repeating the operation of the step 1) until the groundwater quality meets the standard requirement. The standard requirements of the groundwater quality of the invention are determined according to the application of the groundwater.
Preferably, the injection flow rate of the ozone is 100-300g/h, the injection flow rate of the hydrogen peroxide is 0.5-5L/h, and the injection flow rate of the fly ash slurry is 0.01-0.1L/h.
Preferably, the ozone injection time is 20-40min, the hydrogen peroxide injection time is 20-40min, and the fly ash slurry injection time is 20-40 min.
Preferably, the operation of the step 1) is repeated at intervals of 1-3 hours after the fly ash slurry is injected into the underground aquifer until the groundwater quality meets the standard requirement.
Preferably, the preparation method of the fly ash slurry comprises the following steps: mixing the fly ash and the montmorillonite, soaking the mixture in hydrogen peroxide, filtering after soaking, roasting a filter cake, crushing the roasted filter cake, and mixing the crushed filter cake with water to prepare fly ash slurry.
Preferably, the mass ratio of the fly ash to the montmorillonite is 1: (0.05-0.2);
the soaking temperature is 20-30 ℃, the soaking time is 0.5-2h, the roasting temperature is 300-400 ℃, and the roasting time is 0.5-2 h.
Preferably, the mass concentration of the hydrogen peroxide is 4-40%, and the mass concentration of the fly ash in the fly ash slurry is 10-15%.
Preferably, the first and second liquid crystal materials are,
as shown in fig. 2, the integrated two-channel injection well comprises an ozone channel 1 and a medicament channel 2 which are independent of each other, wherein one ends of the ozone channel 1 and the medicament channel 2 are respectively provided with an aeration head, the aeration head 3 of the ozone channel is communicated with an ozone injection valve, the aeration head 4 of the medicament channel is communicated with the medicament injection valve, the space between the aeration head 3 of the ozone channel and the aeration head 4 of the medicament channel is filled with a water-stop material, and the aeration head 3 of the ozone channel is positioned below the aeration head 4 of the medicament channel. The integrated double-channel injection well is prefabricated by stainless steel materials and can be directly drilled into a groundwater aquifer through a direct-push type drilling machine. Optionally, the water stopping material is quartz sand 5, and optionally, the injection valve is a peristaltic pump.
Preferably, the ozone generator further comprises an air compression device, an air storage device, an oxygen generation device, an oxygen storage device and an ozone manufacturing device which are sequentially connected, wherein an ozone outlet of the ozone manufacturing device is connected with the ozone injection valve. Optionally, the air compression device is an air compressor, the air storage device is an air storage tank, the oxygen generation device is an oxygen generator, the oxygen storage device is an oxygen compression tank, and the ozone generation device is an ozone generator.
The air compressor compresses and dries air, stores the air in the air storage tank and is connected with the oxygen making machine; the oxygen making machine is connected with the oxygen compression tank, and dry air is made into oxygen through the oxygen making machine and stored in the oxygen compression tank; the oxygen compression tank is connected with the ozone generator, pure oxygen is used for generating ozone in a high-voltage arc mode, the ozone is discharged from an ozone outlet of the ozone generator, enters an ozone channel 1 of the integrated double-channel injection well through an ozone injection valve, and is injected into an underground water pollution area through an aeration head.
Preferably, the device further comprises a medicament storage device, and a medicament outlet of the medicament storage device is connected with the medicament injection valve. The medicament storage device is a medicament storage tank. Alternatively, the number of the drug storage tanks may be 2, or the drug storage tank may be divided into two independent drug storage spaces. Optionally, the medicament storage jar is hydrogen peroxide solution holding vessel and fly ash thick liquid holding vessel, the liquid outlet of hydrogen peroxide solution holding vessel and fly ash thick liquid holding vessel is connected with the medicament injection valve respectively.
Optionally, the ozone injection device further comprises an automatic control system, wherein the automatic control system is respectively connected with the medicament injection valve and the ozone injection valve so as to control the flow rates of the medicament and the ozone.
Example 2
This example provides a method for repairing underground water, which uses the in-situ injection of the underground water of a certain coking plant to perform a pilot test on the siteFor example, the test area is mainly benzene polluted, the benzene concentration in the underground water in the monitoring well is 3000 mu g/L before in-situ remediation is implemented, and the area of the test area is about 100 square meters. According to the result of the early-stage site investigation, the underground aquifer of the restoration area is located 9-12 m underground, mainly comprises silt and fine sand, and has an average permeability coefficient of 1.29 multiplied by 10-3cm/s; according to the pollution distribution of an experimental area, 1 integrated double-channel injection well is selected to be built in an underground water pollution area, wherein an aeration head connected with an ozone channel is positioned below the ground by 11-12m, and an aeration head connected with a medicament channel is positioned below the ground by 10-10.7 m;
the groundwater remediation method comprises the following steps:
1) injecting ozone into an underground aquifer through an ozone channel in the integrated double-channel injection well, wherein the ozone injection flow rate is 200g/h, the ozone injection time is 35min, then injecting hydrogen peroxide (the mass concentration of hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the hydrogen peroxide injection flow rate is 1.8L/h, and the hydrogen peroxide injection time is 30min, and finally injecting fly ash slurry (the mass concentration of fly ash in the fly ash slurry is 12%) into the underground aquifer through the medicament channel in the integrated double-channel injection well, wherein the fly ash slurry injection flow rate is 0.08L/h, and the fly ash slurry injection time is 30 min; after the injection of the fly ash slurry is finished, waiting for 2 hours to enable ozone, the medicament and benzene pollutants in water to fully react;
2) after waiting for 2 hours, repeating the operation of the step 1) for 2 times, and only injecting ozone and hydrogen peroxide into the underground aquifer according to the operation in the step 1) until the water quality of the underground water meets the standard requirement without injecting the fly ash slurry into the underground aquifer any more.
The preparation method of the fly ash slurry comprises the following steps: mixing fly ash and montmorillonite (the mass ratio of the fly ash to the montmorillonite is 1: 0.1), soaking the mixture in hydrogen peroxide (the mass concentration of hydrogen peroxide is 12%), wherein the soaking temperature is 25 ℃, the soaking time is 1h, filtering is carried out after the soaking is finished, a filter cake is roasted, the roasting temperature is 320 ℃, the roasting time is 1h, then the roasted filter cake is crushed, and the crushed filter cake is mixed with water to prepare fly ash slurry.
Collecting 1 time of underground water samples every 2 days, detecting the benzene concentration of the underground aquifer, and carrying out the experimental process for 40 days in total, wherein the injection of ozone and medicament is carried out for 30 days, the tracking monitoring is carried out for 10 days, the benzene concentration in the underground water is reduced to 150 mug/L on the 10 th day after the ozone, hydrogen peroxide and coal ash slurry is injected into the aquifer, and the benzene concentration in the underground water is reduced to 80 mug/L on the 40 th day after the ozone, hydrogen peroxide and coal ash slurry is injected into the aquifer.
Example 3
The embodiment provides a method for restoring underground water, which is implemented by taking a pilot test of in-situ injection of the underground water of a certain coking plant as an example, wherein a test area is mainly polluted by benzene, the benzene concentration in the underground water in a monitoring well before in-situ restoration is implemented is 3000 mu g/L, and the area of the test area is about 100 square meters. According to the result of the early-stage site investigation, the underground aquifer of the restoration area is located 9-12 m underground, mainly comprises silt and fine sand, and has an average permeability coefficient of 1.29 multiplied by 10-3cm/s; according to the pollution distribution of an experimental area, 1 integrated double-channel injection well is selected to be built in an underground water pollution area, wherein an aeration head connected with an ozone channel is positioned below the ground by 11-12m, and an aeration head connected with a medicament channel is positioned below the ground by 10-10.7 m;
the groundwater remediation method comprises the following steps:
1) injecting ozone into an underground aquifer through an ozone channel in the integrated double-channel injection well, wherein the ozone injection flow rate is 300g/h, the ozone injection time is 30min, then injecting hydrogen peroxide (the mass concentration of hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the hydrogen peroxide injection flow rate is 2.0L/h, and the hydrogen peroxide injection time is 25min, and finally injecting fly ash slurry (the mass concentration of fly ash in the fly ash slurry is 12%) into the underground aquifer through the medicament channel in the integrated double-channel injection well, wherein the fly ash slurry injection flow rate is 0.06L/h, and the fly ash slurry injection time is 40 min; after the injection of the fly ash slurry is finished, waiting for 2 hours to enable ozone, the medicament and benzene pollutants in water to fully react;
2) injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the ozone injection flow rate is 300g/h, the ozone injection time is 30min, then injecting hydrogen peroxide (the mass concentration of hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the hydrogen peroxide injection flow rate is 2.0L/h, and the hydrogen peroxide injection time is 25min, and finally injecting fly ash slurry (the mass concentration of fly ash in the fly ash slurry is 12%) into the underground aquifer through the medicament channel in the integrated double-channel injection well, wherein the fly ash slurry injection flow rate is 0.06L/h, and the fly ash slurry injection time is 40 min; after the injection of the fly ash slurry is finished, waiting for 2 hours to enable ozone, the medicament and benzene pollutants in water to fully react;
3) injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the injection flow rate of the ozone is 300g/h, the injection time of the ozone is 30min, then injecting hydrogen peroxide (the mass concentration of the hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the injection flow rate of the hydrogen peroxide is 2.0L/h, the injection time of the hydrogen peroxide is 25min, and waiting for 2 hours after the injection of the hydrogen peroxide is finished so that the ozone, the medicament and benzene pollutants in the water are fully reacted;
4) and (4) repeating the operation of the step 3) until the groundwater quality meets the standard requirement.
The preparation method of the fly ash slurry comprises the following steps: mixing fly ash and montmorillonite (the mass ratio of the fly ash to the montmorillonite is 1: 0.08), soaking the mixture in hydrogen peroxide (the mass concentration of hydrogen peroxide is 18%), wherein the soaking temperature is 30 ℃, the soaking time is 1.5h, filtering is carried out after the soaking is finished, a filter cake is roasted, the roasting temperature is 350 ℃, the roasting time is 1.2h, then the roasted filter cake is crushed, and the crushed filter cake is mixed with water to prepare fly ash slurry.
Collecting 1 time of underground water samples every 2 days, detecting the benzene concentration of the underground aquifer, and carrying out the experimental process for 40 days in total, wherein the injection of ozone and medicament is carried out for 30 days, tracking and monitoring are carried out for 10 days, the benzene concentration in the underground water is reduced to 155 mu g/L on the 10 th day after the ozone, hydrogen peroxide and coal ash slurry is injected into the aquifer, and the benzene concentration in the underground water is reduced to 83 mu g/L on the 40 th day after the ozone, hydrogen peroxide and coal ash slurry is injected into the aquifer.
Example 4
The embodiment provides a method for restoring underground water, which is implemented by taking a pilot test of in-situ injection of the underground water of a certain coking plant as an example, wherein a test area is mainly polluted by benzene, the benzene concentration in the underground water in a monitoring well before in-situ restoration is implemented is 3000 mu g/L, and the area of the test area is about 100 square meters. According to the result of the early-stage site investigation, the underground aquifer of the restoration area is located 9-12 m underground, mainly comprises silt and fine sand, and has an average permeability coefficient of 1.29 multiplied by 10-3cm/s; according to the pollution distribution of an experimental area, 1 integrated double-channel injection well is selected to be built in an underground water pollution area, wherein an aeration head connected with an ozone channel is positioned below the ground by 11-12m, and an aeration head connected with a medicament channel is positioned below the ground by 10-10.7 m;
the groundwater remediation method comprises the following steps:
1) injecting ozone into an underground aquifer through an ozone channel in the integrated double-channel injection well, wherein the ozone injection flow rate is 300g/h, the ozone injection time is 30min, then injecting hydrogen peroxide (the mass concentration of hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the hydrogen peroxide injection flow rate is 2.0L/h, and the hydrogen peroxide injection time is 25min, and finally injecting fly ash slurry (the mass concentration of fly ash in the fly ash slurry is 12%) into the underground aquifer through the medicament channel in the integrated double-channel injection well, wherein the fly ash slurry injection flow rate is 0.06L/h, and the fly ash slurry injection time is 40 min; after the injection of the fly ash slurry is finished, waiting for 2 hours to enable ozone, the medicament and benzene pollutants in water to fully react;
2) injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the ozone injection flow rate is 300g/h, the ozone injection time is 30min, then injecting hydrogen peroxide (the mass concentration of hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the hydrogen peroxide injection flow rate is 2.0L/h, and the hydrogen peroxide injection time is 25min, and finally injecting fly ash slurry (the mass concentration of fly ash in the fly ash slurry is 12%) into the underground aquifer through the medicament channel in the integrated double-channel injection well, wherein the fly ash slurry injection flow rate is 0.06L/h, and the fly ash slurry injection time is 40 min; after the injection of the fly ash slurry is finished, waiting for 2 hours to enable ozone, the medicament and benzene pollutants in water to fully react;
3) injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the injection flow rate of the ozone is 300g/h, the injection time of the ozone is 30min, then injecting hydrogen peroxide (the mass concentration of the hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the injection flow rate of the hydrogen peroxide is 2.0L/h, the injection time of the hydrogen peroxide is 25min, and waiting for 2 hours after the injection of the hydrogen peroxide is finished so that the ozone, the medicament and benzene pollutants in the water are fully reacted;
4) and (4) repeating the operation of the step 3) until the groundwater quality meets the standard requirement.
The preparation method of the fly ash slurry comprises the following steps: soaking the fly ash in hydrogen peroxide (the mass concentration of the hydrogen peroxide is 18 percent), wherein the soaking temperature is 30 ℃, the soaking time is 1.5 hours, filtering is carried out after the soaking is finished, a filter cake is roasted, the roasting temperature is 350 ℃, the roasting time is 1.2 hours, then the roasted filter cake is crushed, and the crushed filter cake is mixed with water to prepare the fly ash slurry.
Collecting 1 time of underground water samples every 2 days, detecting the benzene concentration of the underground aquifer, and carrying out the experimental process for 40 days in total, wherein the injection of ozone and medicament is carried out for 30 days, tracking and monitoring are carried out for 10 days, the benzene concentration in the underground water is reduced to 170 mu g/L on the 10 th day after the ozone, hydrogen peroxide and coal ash slurry is injected into the aquifer, and the benzene concentration in the underground water is reduced to 91 mu g/L on the 40 th day after the ozone, hydrogen peroxide and coal ash slurry is injected into the aquifer.
Example 5
The embodiment provides a method for restoring underground water, which is implemented by taking a pilot test of in-situ injection of the underground water of a certain coking plant as an example, wherein a test area is mainly polluted by benzene, the benzene concentration in the underground water in a monitoring well before in-situ restoration is implemented is 3000 mu g/L, and the area of the test area is about 100 square meters. According to the result of the early-stage site investigation, the underground aquifer of the repair area is located 9-12 m underground and mainly comprises silt and fine sand which are averagePermeability coefficient of 1.29X 10-3cm/s; according to the pollution distribution of an experimental area, 1 integrated double-channel injection well is selected to be built in an underground water pollution area, wherein an aeration head connected with an ozone channel is positioned below the ground by 11-12m, and an aeration head connected with a medicament channel is positioned below the ground by 10-10.7 m;
the groundwater remediation method comprises the following steps:
1) injecting ozone into an underground aquifer through an ozone channel in the integrated double-channel injection well, wherein the ozone injection flow rate is 300g/h, the ozone injection time is 30min, then injecting hydrogen peroxide (the mass concentration of hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the hydrogen peroxide injection flow rate is 2.0L/h, and the hydrogen peroxide injection time is 25min, and finally injecting fly ash slurry (the mass concentration of fly ash in the fly ash slurry is 12%) into the underground aquifer through the medicament channel in the integrated double-channel injection well, wherein the fly ash slurry injection flow rate is 0.06L/h, and the fly ash slurry injection time is 40 min; after the injection of the fly ash slurry is finished, waiting for 2 hours to enable ozone, the medicament and benzene pollutants in water to fully react;
2) injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the ozone injection flow rate is 300g/h, the ozone injection time is 30min, then injecting hydrogen peroxide (the mass concentration of hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the hydrogen peroxide injection flow rate is 2.0L/h, and the hydrogen peroxide injection time is 25min, and finally injecting fly ash slurry (the mass concentration of fly ash in the fly ash slurry is 12%) into the underground aquifer through the medicament channel in the integrated double-channel injection well, wherein the fly ash slurry injection flow rate is 0.06L/h, and the fly ash slurry injection time is 40 min; after the injection of the fly ash slurry is finished, waiting for 2 hours to enable ozone, the medicament and benzene pollutants in water to fully react;
3) injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the injection flow rate of the ozone is 300g/h, the injection time of the ozone is 30min, then injecting hydrogen peroxide (the mass concentration of the hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the injection flow rate of the hydrogen peroxide is 2.0L/h, the injection time of the hydrogen peroxide is 25min, and waiting for 2 hours after the injection of the hydrogen peroxide is finished so that the ozone, the medicament and benzene pollutants in the water are fully reacted;
4) and (4) repeating the operation of the step 3) until the groundwater quality meets the standard requirement.
The preparation method of the fly ash slurry comprises the following steps: mixing fly ash and montmorillonite (the mass ratio of fly ash to montmorillonite is 1: 0.08), roasting the mixture at 350 ℃ for 1.2h, crushing the roasted mixture, and mixing the crushed mixture with water to prepare fly ash slurry.
Collecting 1 time of underground water samples every 2 days, detecting the benzene concentration of the underground aquifer, and carrying out the experimental process for 40 days in total, wherein the injection of ozone and medicament is carried out for 30 days, tracking and monitoring are carried out for 10 days, the benzene concentration in the underground water is reduced to 192 mug/L on the 10 th day after the ozone, hydrogen peroxide and coal ash slurry is injected into the aquifer, and the benzene concentration in the underground water is reduced to 102 mug/L on the 40 th day after the ozone, hydrogen peroxide and coal ash slurry is injected into the aquifer.
Comparative example 1
The comparative example provides a method for restoring underground water, which takes a pilot test of in-situ injection of the underground water of a certain coking plant as an example, wherein a test area is mainly benzene pollution, the benzene concentration in the underground water in a monitoring well before in-situ restoration is implemented is 3000 mu g/L, and the area of the test area is about 100 square meters. According to the result of the early-stage site investigation, the underground aquifer of the restoration area is located 9-12 m underground, mainly comprises silt and fine sand, and has an average permeability coefficient of 1.29 multiplied by 10-3cm/s; according to the pollution distribution of an experimental area, 1 integrated double-channel injection well is selected to be built in an underground water pollution area, wherein an aeration head connected with an ozone channel is positioned below the ground by 11-12m, and an aeration head connected with a medicament channel is positioned below the ground by 10-10.7 m;
the groundwater remediation method comprises the following steps:
1) injecting ozone into an underground aquifer through an ozone channel in the integrated double-channel injection well, wherein the injection flow rate of the ozone is 300g/h, the injection time of the ozone is 30min, then injecting hydrogen peroxide (the mass concentration of the hydrogen peroxide is 20%) into the underground aquifer through a medicament channel in the integrated double-channel injection well, the injection flow rate of the hydrogen peroxide is 2.0L/h, the injection time of the hydrogen peroxide is 25min, and waiting for 2 hours after the injection of the hydrogen peroxide is finished so that the ozone, the medicament and benzene pollutants in water can fully react;
2) and (3) repeating the operation of the step 1) until the groundwater quality meets the standard requirement.
Collecting 1 time of underground water samples every 2 days, detecting the benzene concentration of an underground water-bearing layer, and carrying out the experimental process for 40 days in total, wherein the injection of ozone and hydrogen peroxide is carried out for 30 days, the tracking monitoring is carried out for 10 days, the benzene concentration in the underground water is reduced to 249 mug/L in the 10 th day after the injection of the ozone and the hydrogen peroxide into the water-bearing layer, and the benzene concentration in the underground water is reduced to 121 mug/L in the 40 th day after the injection of the ozone and the hydrogen peroxide into the water-bearing layer.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. The underground water repairing method is characterized by comprising the following steps:
1) injecting ozone into an underground water-bearing layer through an ozone channel in the integrated double-channel injection well, then injecting hydrogen peroxide into the underground water-bearing layer through a medicament channel in the integrated double-channel injection well, and finally injecting the fly ash slurry into the underground water-bearing layer through the medicament channel in the integrated double-channel injection well;
2) and (3) repeating the operation of the step 1) until the groundwater quality meets the standard requirement.
2. A groundwater remediation method as claimed in claim 1 wherein in step 2), the injection of the fly ash slurry into the groundwater aquifer is stopped after repeating the operation of step 1) 1 to 5 times.
3. A groundwater remediation method as claimed in claim 1 or claim 2 wherein the ozone injection flow rate is 100-300g/h, the hydrogen peroxide injection flow rate is 0.5-5L/h, the fly ash slurry injection flow rate is 0.01-0.1L/h;
the ozone injection time is 20-40min, the hydrogen peroxide injection time is 20-40min, and the fly ash slurry injection time is 20-40 min.
4. A groundwater remediation method as claimed in any one of claims 1 to 3 wherein the operation of step 1) is repeated at intervals of 1 to 3 hours after the fly ash slurry is injected into the groundwater aquifer until the groundwater quality meets standard requirements.
5. A groundwater remediation method as claimed in any of claims 1 to 4 wherein the fly ash slurry is prepared by a method comprising the steps of: mixing the fly ash and the montmorillonite, soaking the mixture in hydrogen peroxide, filtering after soaking, roasting a filter cake, crushing the roasted filter cake, and mixing the crushed filter cake with water to prepare fly ash slurry.
6. A groundwater remediation method as claimed in any one of claims 1 to 5 wherein the mass ratio of fly ash to montmorillonite is 1: (0.05-0.2);
the soaking temperature is 20-30 ℃, the soaking time is 0.5-2h, the roasting temperature is 300-400 ℃, and the roasting time is 0.5-2 h.
7. A groundwater remediation method as claimed in any one of claims 1 to 6 wherein the mass concentration of hydrogen peroxide is 4 to 40% and the mass concentration of fly ash in the fly ash slurry is 10 to 15%.
8. A groundwater remediation method as claimed in any one of claims 1 to 7,
the integrated double-channel injection well comprises an ozone channel and a medicament channel which are mutually independent, wherein one ends of the ozone channel and the medicament channel are respectively provided with an aeration head, the aeration head of the ozone channel is communicated with an ozone injection valve, the aeration head of the medicament channel is communicated with the medicament injection valve, the aeration head of the ozone channel and the aeration head of the medicament channel are filled with a water stop material, and the aeration head of the ozone channel is positioned below the aeration head of the medicament channel.
9. A groundwater remediation method as claimed in any one of claims 1 to 8 further comprising an air compression device, an air storage device, an oxygen generation device, an oxygen storage device, and an ozone production device connected in sequence, wherein the ozone outlet of the ozone production device is connected to an ozone injection valve.
10. A groundwater remediation method as claimed in any one of claims 1 to 9 further comprising a chemical storage device, the chemical outlet of the chemical storage device being connected to a chemical injection valve.
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| CN1837076A (en) * | 2006-04-07 | 2006-09-27 | 重庆大学 | Process for degradation of organic waste water by fly ash |
| CN102765800A (en) * | 2012-08-13 | 2012-11-07 | 常州大学 | Treatment method of organic wastewater through synthesis-free heterogeneous Fenton treatment |
| CN112028222A (en) * | 2020-07-13 | 2020-12-04 | 安徽国祯环境修复股份有限公司 | Underground water repairing system and method thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1837076A (en) * | 2006-04-07 | 2006-09-27 | 重庆大学 | Process for degradation of organic waste water by fly ash |
| CN102765800A (en) * | 2012-08-13 | 2012-11-07 | 常州大学 | Treatment method of organic wastewater through synthesis-free heterogeneous Fenton treatment |
| CN112028222A (en) * | 2020-07-13 | 2020-12-04 | 安徽国祯环境修复股份有限公司 | Underground water repairing system and method thereof |
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| 吴正直主编, 中国矿业大学出版社 * |
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