CN112661311B - Groundwater remediation method - Google Patents
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- CN112661311B CN112661311B CN202011612615.1A CN202011612615A CN112661311B CN 112661311 B CN112661311 B CN 112661311B CN 202011612615 A CN202011612615 A CN 202011612615A CN 112661311 B CN112661311 B CN 112661311B
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Abstract
The application belongs to the technical field of groundwater treatment, and particularly relates to a groundwater remediation method. The groundwater remediation method provided by the application comprises the following steps: 1) Injecting ozone into the underground aquifer 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 finally injecting the fly ash slurry into the underground aquifer through a medicament channel in the integrated double-channel injection well; 2) Repeating the operation of the step 1) until the quality of the groundwater meets the standard requirement. The groundwater remediation method provided by the application has low cost, and can greatly improve the removal efficiency of organic pollutants in groundwater.
Description
Technical Field
The application belongs to the technical field of groundwater treatment, and particularly relates to a groundwater remediation method.
Background
Currently, the common contaminated site groundwater remediation technology includes two major categories, namely ex-situ and in-situ, which determines that contaminated site remediation equipment is also classified into in-situ remediation devices and ex-situ remediation devices. Due to obvious defects of secondary pollution and the like in the ectopic treatment process, the in-situ repair technology is widely applied in recent years.
The in-situ treatment technology is a hot spot for the research of the groundwater pollution treatment technology, not only saves the treatment cost relatively, but also reduces the surface treatment facilities, reduces the exposure of pollutants to the greatest extent and reduces the disturbance to the environment, and is a promising groundwater pollution treatment technology. Since the mid-80 s in the united states, a great deal of money has been invested in-situ soil and groundwater remediation, and new in-situ remediation technologies have evolved, such as in-situ chemical oxidation and in-situ vapor extraction. The in-situ chemical oxidation technology is to add a chemical oxidant into soil through an in-situ restoration device to enable the chemical oxidant to react with pollutants so as to achieve the purpose of removing and purifying the pollutants, however, the existing in-situ chemical oxidation technology needs to inject a large amount of oxidant into a soil layer, has higher cost and has lower removal efficiency of organic pollutants in groundwater.
In view of the above, there is an urgent need to develop a groundwater remediation method that is less costly and has higher efficiency in removing organic contaminants from groundwater.
Disclosure of Invention
Therefore, the application aims to solve the technical problems that the existing groundwater in-situ restoration method has higher cost and lower efficiency of removing organic pollutants in groundwater, and further provides a groundwater restoration method.
Therefore, the application adopts the technical proposal that,
a groundwater remediation method comprises the following steps:
1) Injecting ozone into the underground aquifer 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 finally injecting the fly ash slurry into the underground aquifer through a medicament channel in the integrated double-channel injection well;
2) Repeating the operation of the step 1) until the quality of the groundwater meets the standard requirement.
Preferably, in step 2), the injection of the fly ash slurry into the subterranean aquifer is stopped after repeating step 1) 1-5 times. In the application, the times of injecting the coal ash slurry into the underground aquifer are 1-5 times, the injection flow rate of the coal ash slurry is 0.01-0.1L/h each time, and the injection time of the coal ash slurry is 20-40min. After the flyash slurry is repeatedly injected into the underground aquifer for 1-5 times, stopping injecting the flyash slurry into the underground aquifer, at the moment, only injecting ozone into the underground aquifer through the ozone channel in the integrated double-channel injection well, then injecting hydrogen peroxide into the underground aquifer through the medicament channel in the integrated double-channel injection well, and repeating the operation until the quality of the underground water reaches the standard requirement.
Preferably, the ozone injection flow is 100-300g/h, the hydrogen peroxide injection flow is 0.5-5L/h, and the coal ash slurry injection flow 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 20-40min.
Preferably, the operation of step 1) is repeated after the pulverized fuel ash slurry is injected into the underground aquifer for 1-3 hours until the quality of the underground water meets the standard requirement.
Optionally, after repeating the injection of the fly ash slurry into the underground aquifer for 1-5 times, stopping the injection of the fly ash slurry into the underground aquifer, at the moment, injecting ozone into the underground aquifer only through the ozone channel in the integrated double-channel injection well, then injecting hydrogen peroxide into the underground aquifer through the medicament channel in the integrated double-channel injection well, and repeating the operation at intervals of 1-3 hours after injecting the hydrogen peroxide into the underground aquifer 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 fly ash with 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 the 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 0.5-2h.
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 method comprises the steps of,
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 heads of the ozone channel are communicated with the ozone injection valve, the aeration heads of the medicament channel are communicated with the medicament injection valve, water stopping materials are filled between the aeration heads of the ozone channel and the medicament channel, and the aeration heads of the ozone channel are positioned below the aeration heads of the medicament channel.
Preferably, the device 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 connected in sequence, wherein an ozone outlet of the ozone manufacturing device is connected with an ozone injection valve.
Preferably, a medicament storage device is further included, and a medicament outlet of the medicament storage device is connected to the medicament injection valve.
The technical scheme of the application has the following advantages:
1) The groundwater remediation method provided by the application comprises the following steps: injecting ozone into the underground aquifer 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 finally injecting the fly ash slurry into the underground aquifer through a medicament channel in the integrated double-channel injection well; repeating the operation of the step 1) until the quality of the groundwater meets the standard requirement. According to the application, ozone, hydrogen peroxide and fly ash slurry are sequentially injected into the underground aquifer, so that 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 a plurality of metal elements, the hydrogen peroxide can be catalyzed to decompose, and the special porous structure of the fly ash can effectively adsorb the organic pollutants. The groundwater remediation method provided by the application has the advantages of lower cost and simple equipment, and can effectively improve the remediation efficiency and avoid secondary pollution of groundwater.
2) The application provides a groundwater remediation method, further, the preparation method of the fly ash slurry comprises the following steps: mixing fly ash with 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 the fly ash slurry. According to the application, montmorillonite is added into the fly ash, meanwhile, the fly ash and the montmorillonite are soaked in hydrogen peroxide, and then are baked, and the fly ash slurry obtained by mutually matching the steps and the ozone and the hydrogen peroxide act together, so that the remediation efficiency of the underground water organic pollutants can be greatly improved.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present application, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic view of an groundwater remediation device according to the application;
FIG. 2 is a schematic diagram of an integrated dual channel injection well structure;
wherein the reference numerals are expressed as:
1. an ozone channel; 2. a medicament channel; 3. an aeration head of the ozone channel; 4. an aeration head of the medicament channel; 5. quartz sand.
Detailed Description
The following description of the present application will be made clearly and fully, and it is apparent that the embodiments described are some, but not all, of the embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
In the description of the present application, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present application. 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 application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present application will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
Example 1
As shown in fig. 1, the embodiment provides a groundwater remediation method, which includes the following steps:
1) Injecting ozone into the underground aquifer 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 finally injecting the fly ash slurry into the underground aquifer through a medicament channel in the integrated double-channel injection well;
2) Repeating the operation of the step 1) until the quality of the groundwater meets the standard requirement. The standard requirements of the groundwater quality according to the application depend on the use of the groundwater.
Preferably, the ozone injection flow is 100-300g/h, the hydrogen peroxide injection flow is 0.5-5L/h, and the coal ash slurry injection flow 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 20-40min.
Preferably, the operation of step 1) is repeated after the pulverized fuel ash slurry is injected into the underground aquifer for 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 fly ash with 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 the 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 0.5-2h.
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 method comprises the steps of,
as shown in fig. 2, the integrated dual-channel injection well comprises an ozone channel 1 and a medicament channel 2 which are independent of each other, one ends of the ozone channel 1 and the medicament channel 2 are respectively provided with an aeration head, an aeration head 3 of the ozone channel is communicated with an ozone injection valve, an aeration head 4 of the medicament channel is communicated with the medicament injection valve, a water stopping material is filled between the aeration head 3 of the ozone channel and the aeration head 4 of the medicament channel, 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 an underground water aquifer through a direct-pushing drilling machine. Optionally, the water stopping material is quartz sand 5, and optionally, the injection valve is a peristaltic pump.
Preferably, the device 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 connected in sequence, wherein an ozone outlet of the ozone manufacturing device is connected with an ozone injection valve. Optionally, the air compression device is an air compressor, the air storage device is an air storage tank, the oxygen generating device is an oxygen manufacturing machine, the oxygen storage device is an oxygen compression tank, and the ozone manufacturing device is an ozone manufacturing machine.
The air compressor compresses and dries air, stores the air in the air storage tank and is connected with the oxygen manufacturing machine; the oxygen making machine is connected with the oxygen compression tank, and the 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 manufacturing machine, pure oxygen is used for generating ozone in a high-voltage electric arc mode, ozone is discharged from an ozone outlet of the ozone manufacturing machine, enters an ozone channel 1 of the integrated double-channel injection well through the ozone injection valve, and is injected into a groundwater pollution area through the aeration head.
Preferably, a medicament storage device is further included, and a medicament outlet of the medicament storage device is connected to the medicament injection valve. The medicament storage device is a medicament storage tank. Alternatively, the number of the medicine storage tanks may be 2, or the medicine storage tanks may be divided into two independent medicine storage spaces. Optionally, the medicament storage tank is a hydrogen peroxide storage tank and a fly ash slurry storage tank, and liquid outlets of the hydrogen peroxide storage tank and the fly ash slurry storage tank are respectively connected with the medicament injection valve.
Optionally, the device further comprises an automatic control system which is respectively connected with the medicament injection valve and the ozone injection valve to control the inflow rates of the medicament and the ozone.
Example 2
The embodiment provides a groundwater remediation method, taking a pilot test experiment of a coking plant groundwater in-situ injection site as an example, a test area is mainly benzene pollution, the benzene concentration in groundwater in a monitoring well before in-situ remediation is implemented is 3000 mug/L, and the area of the test area is about 100 square meters. According to the results of the previous site investigation, the underground aquifer of the repair area is positioned at 9-12 m underground, mainly powder sand-fine sand, and the average permeability coefficient is 1.29 multiplied by 10 -3 cm/s; according to pollution distribution of an experimental area, 1-port integrated double-channel injection is selectively built in a groundwater pollution areaA well, wherein the aeration head connected with the ozone channel is positioned at 11-12m underground, and the aeration head connected with the medicament channel is positioned at 10-10.7m underground;
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 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 is 1.8L/h, 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 a medicament channel in the integrated double-channel injection well, the fly ash slurry injection flow is 0.08L/h, and the fly ash slurry injection time is 30min; after the injection of the fly ash slurry is finished, waiting for 2 hours to fully react the ozone, the medicament and benzene pollutants in water;
2) After waiting for 2 hours, repeating the operation of the step 1) for 2 times, and then, injecting the pulverized fuel ash slurry into the underground aquifer no longer according to the operation of the step 1), and injecting ozone and hydrogen peroxide into the underground aquifer until the quality of the underground water 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 1:0.1), soaking the mixture in hydrogen peroxide (the mass concentration of the hydrogen peroxide is 12%), wherein the soaking temperature is 25 ℃, the soaking time is 1h, filtering after the soaking is finished, roasting a filter cake, the roasting temperature is 320 ℃, the roasting time is 1h, crushing the roasted filter cake, and mixing the crushed filter cake with water to prepare the fly ash slurry.
And collecting underground water samples 1 time every 2 days, detecting benzene concentration of an underground water-bearing layer, and performing an experiment process for 40 days, wherein ozone and a medicament are injected for 30 days, tracking and monitoring are performed for 10 days, when the ozone, the hydrogen peroxide and the pulverized coal slurry are injected into the water-bearing layer, the benzene concentration in the underground water is reduced to 150 mug/L, and when the ozone, the hydrogen peroxide and the pulverized coal slurry are injected into the water-bearing layer, the benzene concentration in the underground water is reduced to 80 mug/L at the 40 th day.
Example 3
The embodiment provides a groundwater remediation method, taking a pilot test experiment of a coking plant groundwater in-situ injection site as an example, a test area is mainly benzene pollution, the benzene concentration in groundwater in a monitoring well before in-situ remediation is implemented is 3000 mug/L, and the area of the test area is about 100 square meters. According to the results of the previous site investigation, the underground aquifer of the repair area is positioned at 9-12 m underground, mainly powder sand-fine sand, and the average permeability coefficient is 1.29 multiplied by 10 -3 cm/s; according to pollution distribution of an experimental area, 1-port integrated double-channel injection well is constructed in an underground water pollution area, wherein an aeration head connected with an ozone channel is positioned at 11-12m underground, and an aeration head connected with a medicament channel is positioned at 10-10.7m underground;
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 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 is 2.0L/h, 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 a medicament channel in the integrated double-channel injection well, the fly ash slurry injection flow is 0.06L/h, and the fly ash slurry injection time is 40min; after the injection of the fly ash slurry is finished, waiting for 2 hours to fully react the ozone, the medicament and benzene pollutants in water;
2) Injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the ozone injection flow 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 is 2.0L/h, 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 a medicament channel in the integrated double-channel injection well, the fly ash slurry injection flow is 0.06L/h, and the fly ash slurry injection time is 40min; after the injection of the fly ash slurry is finished, waiting for 2 hours to fully react the ozone, the medicament and benzene pollutants in water;
3) Injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the ozone injection flow 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 is 2.0L/h, the hydrogen peroxide injection time is 25min, and waiting for 2 hours after the hydrogen peroxide injection is finished, so that the ozone, the medicament and benzene pollutants in water fully react;
4) Repeating the operation of the step 3) until the quality of the groundwater 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 the hydrogen peroxide is 18%), wherein the soaking temperature is 30 ℃, the soaking time is 1.5 hours, filtering after the soaking is finished, roasting a filter cake, the roasting temperature is 350 ℃, the roasting time is 1.2 hours, crushing the roasted filter cake, and mixing the crushed filter cake with water to prepare the fly ash slurry.
And collecting underground water samples 1 time every 2 days, detecting benzene concentration of an underground water-bearing layer, and performing an experiment process for 40 days, wherein ozone and a medicament are injected for 30 days, tracking and monitoring are performed for 10 days, when the ozone, the hydrogen peroxide and the pulverized coal slurry are injected into the water-bearing layer, the benzene concentration in the underground water is reduced to 155 mug/L, and when the ozone, the hydrogen peroxide and the pulverized coal slurry are injected into the water-bearing layer, the benzene concentration in the underground water is reduced to 83 mug/L at the 40 th day.
Example 4
The embodiment provides a groundwater remediation method, taking a pilot test experiment of a coking plant groundwater in-situ injection site as an example, a test area is mainly benzene pollution, the benzene concentration in groundwater in a monitoring well before in-situ remediation is implemented is 3000 mug/L, and the area of the test area is about 100 square meters. Repairing the underground of the area according to the result of the previous site investigationThe water-bearing layer is positioned under the ground for 9-12 m, mainly is silt-fine sand, and has an average permeability coefficient of 1.29 multiplied by 10 -3 cm/s; according to pollution distribution of an experimental area, 1-port integrated double-channel injection well is constructed in an underground water pollution area, wherein an aeration head connected with an ozone channel is positioned at 11-12m underground, and an aeration head connected with a medicament channel is positioned at 10-10.7m underground;
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 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 is 2.0L/h, 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 a medicament channel in the integrated double-channel injection well, the fly ash slurry injection flow is 0.06L/h, and the fly ash slurry injection time is 40min; after the injection of the fly ash slurry is finished, waiting for 2 hours to fully react the ozone, the medicament and benzene pollutants in water;
2) Injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the ozone injection flow 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 is 2.0L/h, 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 a medicament channel in the integrated double-channel injection well, the fly ash slurry injection flow is 0.06L/h, and the fly ash slurry injection time is 40min; after the injection of the fly ash slurry is finished, waiting for 2 hours to fully react the ozone, the medicament and benzene pollutants in water;
3) Injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the ozone injection flow 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 is 2.0L/h, the hydrogen peroxide injection time is 25min, and waiting for 2 hours after the hydrogen peroxide injection is finished, so that the ozone, the medicament and benzene pollutants in water fully react;
4) Repeating the operation of the step 3) until the quality of the groundwater meets the standard requirement.
The preparation method of the fly ash slurry comprises the following steps: the fly ash is soaked in hydrogen peroxide (the mass concentration of the hydrogen peroxide is 18%), the soaking temperature is 30 ℃, the soaking time is 1.5 hours, the filtering is carried out after the soaking is finished, the 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.
And collecting underground water samples 1 time every 2 days, detecting benzene concentration of an underground water-bearing layer, and performing an experiment process for 40 days, wherein ozone and a medicament are injected for 30 days, tracking and monitoring are performed for 10 days, when the ozone, the hydrogen peroxide and the pulverized coal slurry are injected into the water-bearing layer, the benzene concentration in the underground water is reduced to 170 mug/L, and when the ozone, the hydrogen peroxide and the pulverized coal slurry are injected into the water-bearing layer, the benzene concentration in the underground water is reduced to 91 mug/L at the 40 th day.
Example 5
The embodiment provides a groundwater remediation method, taking a pilot test experiment of a coking plant groundwater in-situ injection site as an example, a test area is mainly benzene pollution, the benzene concentration in groundwater in a monitoring well before in-situ remediation is implemented is 3000 mug/L, and the area of the test area is about 100 square meters. According to the results of the previous site investigation, the underground aquifer of the repair area is positioned at 9-12 m underground, mainly powder sand-fine sand, and the average permeability coefficient is 1.29 multiplied by 10 -3 cm/s; according to pollution distribution of an experimental area, 1-port integrated double-channel injection well is constructed in an underground water pollution area, wherein an aeration head connected with an ozone channel is positioned at 11-12m underground, and an aeration head connected with a medicament channel is positioned at 10-10.7m underground;
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 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 is 2.0L/h, 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 a medicament channel in the integrated double-channel injection well, the fly ash slurry injection flow is 0.06L/h, and the fly ash slurry injection time is 40min; after the injection of the fly ash slurry is finished, waiting for 2 hours to fully react the ozone, the medicament and benzene pollutants in water;
2) Injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the ozone injection flow 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 is 2.0L/h, 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 a medicament channel in the integrated double-channel injection well, the fly ash slurry injection flow is 0.06L/h, and the fly ash slurry injection time is 40min; after the injection of the fly ash slurry is finished, waiting for 2 hours to fully react the ozone, the medicament and benzene pollutants in water;
3) Injecting ozone into the underground aquifer through an ozone channel in the integrated double-channel injection well again, wherein the ozone injection flow 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 is 2.0L/h, the hydrogen peroxide injection time is 25min, and waiting for 2 hours after the hydrogen peroxide injection is finished, so that the ozone, the medicament and benzene pollutants in water fully react;
4) Repeating the operation of the step 3) until the quality of the groundwater meets the standard requirement.
The preparation method of the fly ash slurry comprises the following steps: mixing fly ash with montmorillonite (the mass ratio of the fly ash to the montmorillonite is 1:0.08), roasting the mixture at the temperature of 350 ℃ for 1.2 hours, crushing the roasted mixture, and mixing the crushed mixture with water to obtain the fly ash slurry.
And collecting underground water samples for 1 time every 2 days, detecting benzene concentration of an underground water-bearing layer, and performing an experiment process for 40 days, wherein ozone and a medicament are injected for 30 days, tracking and monitoring are performed for 10 days, when the ozone, hydrogen peroxide and pulverized coal slurry are injected into the water-bearing layer, the benzene concentration in the underground water is reduced to 192 mug/L, and when the ozone, the hydrogen peroxide and the pulverized coal slurry are injected into the water-bearing layer, the benzene concentration in the underground water is reduced to 102 mug/L at the 40 th day.
Comparative example 1
The comparative example provides a groundwater remediation method, taking a pilot plant experiment of a coke-oven plant groundwater in situ injection site as an example, the test area is mainly benzene pollution, the benzene concentration in the groundwater in the monitoring well is 3000 mug/L before in situ remediation is implemented, and the area of the test area is about 100 square meters. According to the results of the previous site investigation, the underground aquifer of the repair area is positioned at 9-12 m underground, mainly powder sand-fine sand, and the average permeability coefficient is 1.29 multiplied by 10 -3 cm/s; according to pollution distribution of an experimental area, 1-port integrated double-channel injection well is constructed in an underground water pollution area, wherein an aeration head connected with an ozone channel is positioned at 11-12m underground, and an aeration head connected with a medicament channel is positioned at 10-10.7m underground;
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 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 is 2.0L/h, the hydrogen peroxide injection time is 25min, and waiting for 2 hours after the hydrogen peroxide injection is finished, so that the ozone, the medicament and benzene pollutants in water fully react;
2) Repeating the operation of the step 1) until the quality of the groundwater meets the standard requirement.
And collecting underground water samples 1 time every 2 days, detecting benzene concentration of an underground water-bearing layer, and performing an experiment process for 40 days, wherein ozone and hydrogen peroxide are injected for 30 days, tracking and monitoring are performed for 10 days, when the ozone and the hydrogen peroxide are injected into the water-bearing layer, the benzene concentration in the underground water is reduced to 249 mug/L, and when the ozone and the hydrogen peroxide are injected into the water-bearing layer, the benzene concentration in the underground water is reduced to 121 mug/L at the 40 th day.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the application.
Claims (8)
1. The groundwater remediation method is characterized by comprising the following steps:
1) Injecting ozone into the underground aquifer 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 finally injecting the fly ash slurry into the underground aquifer through a medicament channel in the integrated double-channel injection well;
2) Repeating the step 1) until the quality of the groundwater meets the standard requirement;
the preparation method of the fly ash slurry comprises the following steps: mixing fly ash with 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 a fly ash slurry, wherein the mass ratio of the fly ash to the montmorillonite is 1: (0.05-0.2), soaking temperature is 20-30 ℃, soaking time is 0.5-2h, roasting temperature is 300-400 ℃, and roasting time is 0.5-2h.
2. The groundwater remediation method of claim 1 wherein in step 2), the injection of the fly ash slurry into the subterranean aquifer is stopped after repeating step 1) 1-5 times.
3. The groundwater remediation method according to claim 1 or 2, wherein the ozone injection flow is 100-300g/h, the hydrogen peroxide injection flow is 0.5-5L/h, and the fly ash slurry injection flow is 0.01-0.1L/h;
the ozone injection time is 20-40min, the hydrogen peroxide injection time is 20-40min, and the coal ash slurry injection time is 20-40min.
4. A groundwater remediation method according to claim 3 wherein the operation of step 1) is repeated at intervals of 1-3 hours after the injection of the fly ash slurry into the groundwater aquifer until the groundwater quality meets the standard requirements.
5. The groundwater remediation method according to claim 4, wherein the mass concentration of hydrogen peroxide is 4-40%, and the mass concentration of fly ash in the fly ash slurry is 10-15%.
6. The groundwater remediation method of claim 5, wherein,
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 heads of the ozone channel are communicated with the ozone injection valve, the aeration heads of the medicament channel are communicated with the medicament injection valve, and the aeration heads of the ozone channel are positioned below the aeration heads of the medicament channel.
7. The groundwater remediation method of claim 6, further comprising an air compression device, an air storage device, an oxygen production device, an oxygen storage device, an ozone production device connected in sequence, wherein an ozone outlet of the ozone production device is connected with an ozone injection valve.
8. The groundwater remediation method of claim 7, further comprising a medicament storage device, a medicament outlet of the medicament storage device being connected to a medicament injection valve.
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