CN213357050U - Groundwater repair system - Google Patents
Groundwater repair system Download PDFInfo
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- CN213357050U CN213357050U CN202021372157.4U CN202021372157U CN213357050U CN 213357050 U CN213357050 U CN 213357050U CN 202021372157 U CN202021372157 U CN 202021372157U CN 213357050 U CN213357050 U CN 213357050U
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Abstract
The invention discloses an underground water restoration system, which belongs to the technical field of underground water restoration and comprises an air compression-drying-storage system, an oxygen production and storage system, an ozone production and injection system, a hydrogen peroxide storage and injection system, an underground water extraction treatment and reinjection system, a vapor extraction and treatment system and an automatic control system; ozone production and injection systems including air compression-drying-storage, oxygen production and storage, and ozone production, air compressor and injection systems; the hydrogen peroxide storage and injection system comprises a hydrogen peroxide storage tank and an injection peristaltic pump; the integrated double-channel injection well is prefabricated by stainless steel materials; the gas phase extraction and treatment system comprises a gas phase extraction pump, a gas-liquid separator and an active carbon tail gas treatment device; the invention can ensure that the underground water reaches the standard, simultaneously effectively reduce energy consumption and drug consumption, and simultaneously solve the problems of small medicament transmission radius and easy blockage or overflow of an injection well in the prior art.
Description
Technical Field
The invention relates to the technical field of groundwater remediation, in particular to a groundwater remediation system.
Background
The method has the advantages that the method can cause serious pollution to soil and underground water frequently in the production process of enterprises, the content of organic pollutants in the soil and underground water in the heavily polluted sites is very high, most of the pollutants belong to hydrophobic organic matters, the solubility of the pollutants in a water phase is low, the pollutants can be retained in the soil environment for a long time, the structure and the function of the soil are damaged, the physical and chemical properties of the soil are seriously influenced, and the human health can also be influenced.
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. Among them, since the middle of the 80's in the united states, a great deal of capital has been invested for 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 characterized in that a chemical oxidant is added into soil through an in-situ remediation device to perform chemical reaction with pollutant substances, so that the purpose of removing and purifying the pollutants is achieved.
The existing in-situ remediation device mainly comprises two types of medicament injection, wherein one type is drill pipe high-pressure jet grouting injection, and the other type is injection well injection. However, the high-pressure jet injection mode has short injection duration, and cannot ensure long-time injection of the medicament. An in-situ chemical oxidation injection well remediation device is disclosed in U.S. patent No. US 2008/0174571a1, which remediates contaminated soil and groundwater by oxidizing with hydrogen peroxide, ozone and compressed air injected into the contaminated area through an injection well, and a similar process is also proposed in patent No. CN206567315U to achieve in-situ remediation of organic contaminants in groundwater. However, the system is easy to cause air lock or blockage when the system is used for in-situ remediation of the confined aquifer, so that the medicament cannot be injected or overflowed, the influence radius of the medicament in the groundwater is small, and the effective remediation of groundwater pollution is difficult to realize. And the existing injection well is mostly single pump head and manual control, and the online simultaneous automatic injection and accurate control of various medicaments are difficult to realize.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a system and a method for repairing underground water, which can achieve the water quality of the underground water to reach the standard, save energy and reduce consumption, and simultaneously solve the problems that in the prior art, the medicament cannot be injected or overflowed and a plurality of medicaments cannot be injected simultaneously due to small medicament transmission radius and easy air lock of an injection well.
The purpose of the invention can be realized by the following technical scheme:
an underground water remediation system:
comprises an air compression-drying-storage system, an oxygen production and storage system, an ozone production and injection system, a hydrogen peroxide storage and injection system, a groundwater extraction treatment and reinjection system, a vapor extraction and treatment system and an automatic control system;
the ozone manufacturing and injection system comprises an air compression-drying-storage system, an oxygen manufacturing and storage system, an ozone manufacturing system, an air compressor and an injection system, wherein the air compressor is used for compressing and drying air, storing the air in an air storage tank and connecting with the oxygen manufacturing 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 an ozone making machine, pure oxygen is used for generating ozone in a high-voltage arc mode and is connected with one channel of the integrated double-channel injection well, and the ozone is injected into a polluted area through an automatically controlled injection system;
the hydrogen peroxide storage and injection system comprises a hydrogen peroxide storage tank and an injection peristaltic pump, and is connected with the other channel of the integrated double-channel injection well, hydrogen peroxide is injected into a polluted area through an automatically controlled injection system, and is subjected to catalytic reaction with ozone to generate hydroxyl radicals, so that organic pollutants in underground water are degraded in an environment-friendly and efficient manner;
the integrated double-channel injection well is prefabricated by stainless steel materials, can be directly drilled into a groundwater aquifer through a direct-push type drilling machine, and realizes the rapid construction of the injection well and the simultaneous injection of two medicaments, and comprises two independent channels and two independent aeration heads which can be respectively connected with an ozone and hydrogen peroxide injection valve, wherein the hydrogen peroxide injection valve is connected with a hydrogen peroxide aeration head, the ozone injection valve is connected with an ozone aeration head, the hydrogen peroxide aeration head is positioned at the upper part of the ozone/air aeration head, and the space between the two layers of aeration heads is filled with water-stopping material bentonite;
the underground water extraction treatment and reinjection system comprises a water suction pump, a wastewater buffer pool, a treatment pool and a water injection pump, wherein the water suction pump is connected with an extraction well and arranged at the downstream of a polluted area, and the water injection pump is connected with a water injection well and arranged at the upstream of the polluted area, so that the local flow field control of underground water in a pollution remediation area is realized, the flow of underground water is accelerated, and the influence radius of a medicament is enlarged;
the gas phase extraction and treatment system comprises a gas phase extraction pump, a gas-liquid separator and an active carbon tail gas treatment device, wherein the extraction pump is connected with an extraction well, so that pollutants, repair agents, reaction products and other gases in a groundwater aquifer are collected and treated, and the problems of agent overflow and the like in an injection well caused by overlarge pressure in the aquifer are solved.
The invention has the beneficial effects that:
1) the intelligent device for in-situ remediation of soil and underground water based on the artificial hydraulic connection, vapor extraction and in-situ chemical oxidation process is high in integration level and small in occupied area, and can realize online intelligent automatic control through the Internet of things, thereby realizing energy conservation and consumption reduction;
2) the invention can effectively enlarge the transmission radius of the oxidant, enlarge the influence radius of the underground water in-situ repair injection well, reduce the number of the injection wells and the using amount of the medicament, improve the repair efficiency and save the repair cost by utilizing the modes of air pressurization, artificial hydraulic circulation and gas extraction;
3) the integrated double-channel injection well has the advantages of simple construction, high well building speed and good water stopping performance, and can prevent cross contamination among multiple layers of underground water.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a schematic block diagram of a repair facility of the present invention;
FIG. 2 is a schematic plan view of a remediation well;
FIG. 3 is a schematic view of an integrated dual-channel injection well;
FIG. 4 is a schematic diagram of the data detected by three groups of detection wells.
The reference numbers in the figures illustrate:
1 integrated double-channel injection well, 2 extraction well, 3 extraction well, 4 water injection well, 5 pollution range boundary, 6 restoration range boundary, 7 hydrogen peroxide aeration head, 8 ozone aeration head.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
As shown in fig. 1 to 3, an underground water restoration system: comprises an air compression-drying-storage system, an oxygen production and storage system, an ozone production and injection system, a hydrogen peroxide storage and injection system, a groundwater extraction treatment and reinjection system, a vapor extraction and treatment system and an automatic control system;
the ozone manufacturing and injection system comprises air compression-drying-storage, oxygen manufacturing and storage, an ozone manufacturing system, an air compressor and an injection system, wherein the air compressor compresses and dries air and stores the air in an air storage tank and is connected with the oxygen manufacturing 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 an ozone making machine, pure oxygen is used for generating ozone in a high-voltage arc mode and is connected with one channel of the integrated double-channel injection well 1, and the ozone is injected into a polluted area through an automatically controlled injection system;
the hydrogen peroxide storage and injection system comprises a hydrogen peroxide storage tank and an injection peristaltic pump and is connected with the other channel of the integrated double-channel injection well 1, hydrogen peroxide is injected into a polluted area through the automatically controlled injection system and is subjected to catalytic reaction with ozone to generate hydroxyl radicals, and organic pollutants in underground water are degraded in an environment-friendly and efficient manner;
the integrated double-channel injection well is prefabricated by stainless steel materials, can be directly drilled into an underground water-bearing stratum through a direct-push type drilling machine, and realizes the rapid construction of the injection well and the simultaneous injection of two medicaments;
the underground water extraction treatment and reinjection system comprises a water suction pump, a wastewater buffer pool, a treatment pool and a water injection pump, wherein the water suction pump is connected with an extraction well and is arranged at the downstream of a polluted area, and the water injection pump is connected with a water injection well 4 and is arranged at the upstream of the polluted area, so that the local flow field control of the underground water in the polluted remediation area is realized, the flow of the underground water is accelerated, and the influence radius of a medicament is enlarged; the pumping well 3 is connected with an underground water extraction treatment and reinjection system;
the gas phase extraction and treatment system comprises a gas phase extraction pump, a gas-liquid separator and an active carbon tail gas treatment device, wherein the extraction pump is connected with the extraction well, the gas phase extraction and treatment system is connected with the pumping well 2, and gases such as pollutants, repair agents and reaction products in the groundwater aquifer are collected and treated, so that the problems of agent overflow in the injection well and the like caused by overlarge pressure in the aquifer are solved. The total area of the repair field boundary 6 is greater than the contamination field boundary 5. The gas phase extraction and treatment system is connected with the extraction well 2.
A method of groundwater remediation system comprising the steps of:
(1) the underground water at the lower reaches of the restoration area is lifted to a buffer pool by an extraction pump, and is treated on the ground to reach the standard and then is reinjected into an underground water aquifer through an injection well at the upper reaches of the restoration area, so that the accelerated circulation of the local underground water is realized;
(2) injecting ozone and hydrogen peroxide into a groundwater aquifer through an integrated double-channel injection well according to a certain proportion, and efficiently and greenly degrading organic pollutants in groundwater through hydroxyl free radicals generated by an oxidant in the groundwater aquifer;
(3) after the first medicament injection, starting a vapor phase extraction and tail gas treatment system to release and treat the gas in the aquifer; repeating the steps (1) to (3) until the groundwater quality reaches the standard;
(4) the intelligent control system reasonably controls the coordination among the systems, and realizes the in-situ, efficient and rapid standard-reaching remediation of the polluted underground water.
Taking a pilot test of in-situ injection of groundwater of a certain coking plant in China as an example, a test area is mainly polluted by benzene, the concentration range of the groundwater in a monitoring well before in-situ remediation is 2000-10000 mug/L, the remediation target value is 120 mug/L, and the area of the test area is about 300 square meters. According to the result of the earlier stage site investigation, the repair area mainly comprises shallow and deep two-layer groundwater aquifers which are respectively located at 4-7 m and 9-14 m, and a good impervious layer is arranged between the two layers of aquifers for isolation. The first aquifer is mainly a silty clay layer with an average permeability coefficient of 2.20X 10-6cm/s, the second aquifer is mainly silt-fine sand, and the average permeability coefficient is 1.31 multiplied by 10-3cm/s, therefore, the pilot test selects a deep confined aquifer with a higher permeability coefficient.
According to the pollution distribution of an experimental area, 3 medicament injection wells, 2 pumping wells, 2 underground water injection wells, 3 extraction wells and a plurality of monitoring wells are selected to be built in the underground water pollution area. According to the hydrogeological conditions, the middle ozone aeration head of the injection well is arranged at 13.2-12.2 m, and the hydrogen peroxide aeration head is arranged at 11.6-11 m and is just positioned in the second deep confined aquifer. The flow rate of the single pumping well is set to be 10m3Day, treated groundwater was reinjected into the test area through groundwater injection wells. The injection amount of ozone in a single well is 189.5 g/h, the injection amount of hydrogen peroxide is 1.58L/h, the injection pressure of the mixed gas of ozone and air is 44 psi, and the pressure of hydrogen peroxide is 30 psi. And the gas phase extraction well arranged in the injection well region releases and treats gas in the confined aquifer. In the repair experiment, the injection sequence of the repair agent was: hydrogen peroxide was injected first for 30 minutes, followed by ozone and air mixed gas for 30 minutes, and then allowed to react in groundwater for 30 minutes. The repairing agent is injected in 3 injection wells circularly through an automatic control system, and the process parameters are shown in the table I. In the experimental process, conventional indexes such as dissolved oxygen, pH and oxidation-reduction potential in the groundwater are tested every day, 1 time of groundwater sample is collected every 3-7 days, and the groundwater sample is sent to a qualified laboratory for detecting pollutants such as benzene series and the like. The experimental process is co-advancedThe row is 50 days with 30 days of agent injection followed by 20 days.
As shown in FIG. 4, the rectangle, triangle and diamond in the figure respectively represent the detection data of the first detection well, the second detection well and the third detection well, according to the experimental result, the pH value in the groundwater is not obviously changed, the dissolved oxygen in the groundwater begins to be obviously increased after the medicament is injected into the aquifer, and the test result of the benzene series shows that the benzene solubility in the groundwater is reduced from 2000 mug/L to 80-100 mug/L after 10 days of implementation, and the benzene concentration is lower than 100 mug/L in 20 days after the experiment is stopped.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed.
Claims (1)
1. The utility model provides an underground water repair system which characterized in that:
comprises an air compression-drying-storage system, an oxygen production and storage system, an ozone production and injection system, a hydrogen peroxide storage and injection system, a groundwater extraction treatment and reinjection system, a vapor extraction and treatment system and an automatic control system;
the ozone manufacturing and injection system comprises an air compression-drying-storage system, an oxygen manufacturing and storage system, an ozone manufacturing system, an air compressor and an injection system, wherein the air compressor is used for compressing and drying air, storing the air in an air storage tank and connecting with the oxygen manufacturing 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 an ozone making machine, pure oxygen is used for generating ozone in a high-voltage arc mode and is connected with one channel of the integrated double-channel injection well, and the ozone is injected into a polluted area through an automatically controlled injection system;
the hydrogen peroxide storage and injection system comprises a hydrogen peroxide storage tank and an injection peristaltic pump, and is connected with the other channel of the integrated double-channel injection well, hydrogen peroxide is injected into a polluted area through an automatically controlled injection system, and is subjected to catalytic reaction with ozone to generate hydroxyl radicals, so that organic pollutants in underground water are degraded in an environment-friendly and efficient manner;
the integrated double-channel injection well is prefabricated by stainless steel materials, can be directly drilled into a groundwater aquifer through a direct-push type drilling machine, and realizes the rapid construction of the injection well and the simultaneous injection of two medicaments, and comprises two independent channels and two independent aeration heads which can be respectively connected with an ozone and hydrogen peroxide injection valve, wherein the hydrogen peroxide injection valve is connected with a hydrogen peroxide aeration head, the ozone injection valve is connected with an ozone aeration head, the hydrogen peroxide aeration head is positioned at the upper part of the ozone/air aeration head, and the space between the two layers of aeration heads is filled with water-stopping material bentonite;
the underground water extraction treatment and reinjection system comprises a water suction pump, a wastewater buffer pool, a treatment pool and a water injection pump, wherein the water suction pump is connected with an extraction well and arranged at the downstream of a polluted area, and the water injection pump is connected with a water injection well and arranged at the upstream of the polluted area, so that the local flow field control of underground water in a pollution remediation area is realized, the flow of underground water is accelerated, and the influence radius of a medicament is enlarged;
the gas phase extraction and treatment system comprises a gas phase extraction pump, a gas-liquid separator and an active carbon tail gas treatment device, wherein the extraction pump is connected with an extraction well, so that pollutants, repair agents, reaction products and other gases in a groundwater aquifer are collected and treated, and the problems of agent overflow and the like in an injection well caused by overlarge pressure in the aquifer are solved.
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| 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 |
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| 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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