Device for treating chlorobenzene in underground water by utilizing aerobic microorganisms

Abstract

The utility model relates to a device for treating chlorobenzene in underground water by utilizing aerobic microorganisms, which comprises a bacterial liquid mixing component, a bacterial liquid adjusting and reinforcing component, a dissolved oxygen online monitoring component and a solar aeration component which are arranged on the ground near an underground water remediation well, and the bacterial liquid mixing component comprises a mixing pool, a bacterial adding tank and a first water pump; the bacterial liquid adjusting and reinforcing assembly comprises an adjusting tank, and a temperature monitoring regulator, a pH value monitoring regulator and a dissolved oxygen monitoring regulator which are arranged in the adjusting tank, the dissolved oxygen online monitoring assembly is used for monitoring the dissolved oxygen content of a water body in the underground water remediation well in real time, and the solar aeration assembly is used for continuously aerating the water body in the underground water remediation well. The device has the advantages that the device utilizes aerobic microorganisms to degrade chlorobenzene in underground water, so that secondary pollution caused by medicament addition can be reduced; by utilizing solar aeration, green and environment-friendly effects can be realized, the underground water is continuously oxygenated, and the degradation rate of aerobic microorganisms is increased; the method is low in investment, low in operation cost, low in power consumption and suitable for long-term use.

Description

Technical Field

[0001] The utility model belongs to the field of groundwater environment restoration, and particularly relates to a device for treating chlorobenzene in groundwater by using aerobic microorganisms. Background Art

[0002] Chlorobenzene compounds refer to a class of monocyclic aromatic compounds with only hydrogen and chlorine atoms on the benzene ring, and there are 12 homologues in total, mainly including chlorobenzene, dichlorobenzene, trichlorobenzene, tetrachlorobenzene, pentachlorobenzene, hexachlorobenzene, etc. Chlorobenzene is one of the chlorobenzene compounds, which is an artificially synthesized organic compound widely used in industrial and agricultural production. It has a density greater than that of water and belongs to typical heavy non-aqueous phase fluids. Under normal temperature and pressure, its chemical properties are stable. After it enters the groundwater environment, it is difficult to be degraded by indigenous microorganisms and is prone to cause persistent pollution.

[0003] At present, the methods for removing chlorobenzene in groundwater include adsorption method, chemical oxidation method, and microbial method. The adsorption method and chemical oxidation method have problems such as large equipment investment, high energy consumption, low removal efficiency, and easy to cause other pollutions. The microbial method is a remediation technology that uses indigenous microorganisms or exogenous microorganisms with specific functions domesticated artificially. Under the suitable environment created by artificial measures, microorganisms use organic matter as energy and nutrients, and through ring-opening, dechlorination, denitrification, oxidation, reduction and other effects, the activity of harmful pollutants is reduced or degraded into harmless substances. The key to the microbial method is to ensure the metabolic ability and colony abundance of microorganisms. The groundwater is basically in an anaerobic environment, and most anaerobic indigenous microorganisms are difficult to degrade chlorobenzene, and microorganisms with strong degradation and metabolism ability are difficult to survive in the anaerobic environment for a long time. Therefore, based on the above problems, it is necessary to provide a device for treating chlorobenzene in groundwater that is green and environmentally friendly, has a simple operation process, and low operating costs. Summary of the Utility Model

[0004] The utility model provides a device for treating chlorobenzene in groundwater by using aerobic microorganisms, aiming to overcome the above deficiencies existing in the prior art.

[0005] The technical solution of the present utility model to solve the above technical problems is as follows: A device for treating chlorobenzene in groundwater by aerobic microorganisms, which includes a bacterial liquid mixing component, a bacterial liquid adjustment and enhancement component, a dissolved oxygen on-line monitoring component, and a solar aeration component arranged on the ground near the groundwater remediation well. The bacterial liquid mixing component includes a mixing tank, a bacteria addition tank, and a first water pump. The bacterial liquid adjustment and enhancement component includes an adjustment tank and a temperature monitoring regulator, a pH value monitoring regulator, and a dissolved oxygen monitoring regulator arranged in the adjustment tank. The water inlet of the first water pump is communicated with a water diversion pipeline, and the other end of the water diversion pipeline extends into the water body of the groundwater remediation well. The water outlet of the first water pump is communicated with the mixing tank through a water outlet pipe. The bacteria addition tank is used to add the original bacterial liquid to the mixing tank. The water outlet of the mixing tank is communicated with the liquid inlet of the adjustment tank through a pipeline provided with a second water pump. The water outlet of the adjustment tank is communicated with the groundwater remediation well through a pipeline provided with a third water pump. The dissolved oxygen on-line monitoring component is used to monitor the dissolved oxygen content of the water body in the groundwater remediation well in real time. The solar aeration component is used to continuously aerate the water body in the groundwater remediation well.

[0006] Based on the above technical solution, the present utility model can also be improved as follows.

[0007] Further, a first flow meter is provided on the water outlet pipe connecting the first water pump and the mixing tank, and a second flow meter and a flow regulating valve are provided on the pipeline where the water outlet of the adjustment tank extends into the groundwater remediation well.

[0008] Further, a stirrer is installed in the mixing tank, and a third flow meter is provided at the bacterial liquid outlet of the bacteria addition tank.

[0009] Further, the temperature monitoring regulator includes a temperature sensor and an electric heating wire. The pH value monitoring regulator includes a pH sensor and a pH automatic dosing machine. The dissolved oxygen monitoring regulator includes a dissolved oxygen sensor and a blower. The blower injects air into the liquid in the adjustment tank through an air injection pipe. The blower and the dissolved oxygen sensor are electrically connected to a controller.

[0010] Further, the dissolved oxygen on-line monitoring component includes a dissolved oxygen monitor arranged on the ground beside the groundwater remediation well. The dissolved oxygen monitor is electrically connected to a detection probe extending into the water body of the groundwater remediation well through a cable.

[0011] Further, the solar aeration component includes a solar panel, an aeration air pump, and an aeration pipeline. The solar panel is electrically connected to the aeration air pump. One end of the aeration pipeline is communicated with the gas outlet of the aeration air pump, and the other end extends into the water body in the groundwater remediation well.

[0012] Compared with the prior art, the beneficial effects of the present utility model are:

[0013] 1. This device utilizes aerobic microorganisms to degrade chlorobenzene in groundwater, which can reduce secondary pollution caused by the addition of chemicals; 2. This device utilizes solar energy aeration to achieve green environmental protection, continuously increase oxygen for groundwater, and increase the degradation rate of aerobic microorganisms; 3. This device requires low investment, low operating cost, and low power consumption, and is suitable for long-term use. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 A schematic diagram of a device for treating chlorobenzene in groundwater using aerobic microorganisms provided by the utility model;

[0015] In the accompanying drawings, the components represented by the reference numerals are listed as follows:

[0016] 1. Mixing tank; 2. Bacteria adding tank; 3. First water pump; 4. Regulating tank; 5. Temperature monitoring regulator; 6. pH monitoring regulator; 7. Dissolved oxygen monitoring regulator; 8. Water diversion pipeline; 9. Second water pump; 10. Third water pump; 11. First flow meter; 12. Second flow meter; 13. Flow regulating valve; 14. Agitator; 15. Blower; 16. Dissolution monitor; 17. Solar panel; 18. Aeration pump. DETAILED DESCRIPTION

[0017] The principles and features of the present invention are described below in conjunction with the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0018] In the description of the present invention, if terms indicating orientation such as "up", "down", "left", "right", "top", "bottom", "inside" and "outside" are used, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0019] like Figure 1As shown, the utility model provides a device for treating chlorobenzene in groundwater by using aerobic microorganisms, which includes a bacterial liquid mixing component, a bacterial liquid regulating and strengthening component, a dissolved oxygen online monitoring component and a solar aeration component arranged on the ground near the groundwater repair well, the bacterial liquid mixing component includes a mixing tank 1, a bacteria adding tank 2 and a first water pump 3, the bacterial liquid regulating and strengthening component includes a regulating tank 4 and a temperature monitoring regulator 5, a pH value monitoring regulator 6 and a dissolved oxygen monitoring regulator 7 arranged in the regulating tank 4, the water inlet of the first water pump 3 is connected to a water diversion pipeline 8, and the other end of the water diversion pipeline 8 extends to The water in the mixing tank 1 is connected to the mixing tank 1 through a water outlet pipe, and the bacteria adding tank 2 is used to add the original bacteria solution to the mixing tank 1. The water outlet of the mixing tank 1 is connected to the liquid inlet of the regulating tank 4 through a pipeline provided with a second water pump 9, and the water outlet of the regulating tank 4 is connected to the groundwater remediation well through a pipeline provided with a third water pump 10. The dissolved oxygen online monitoring component is used to monitor the dissolved oxygen content of the water in the groundwater remediation well in real time, and the solar aeration component is used to continuously aerate the water in the groundwater remediation well.

[0020] It should be noted that the device first extracts the polluted water source in the groundwater well through the water pump (the first water pump), and discharges it into the mixing tank through the outlet. The dosing tank controls the addition of an appropriate amount of aerobic microbial strains into the mixing tank, and stirs and mixes them fully in the mixing tank. The mixed liquid enters the regulating tank through the water pump (the second water pump), and the aerobic microorganisms are cured in the regulating tank. The temperature is controlled at 20°C to 30°C, the pH is controlled in the range of 6.0-8.5, and the dissolved oxygen concentration is controlled in the range of 2.0-100 mg / L through the regulating tank. The aerobic microbial strain liquid cured in the regulating tank enters the self-priming pump (the third water pump) through a pipeline, and the pressure and flow rate are adjusted on the self-priming pump to control the aerobic bacteria curing liquid to enter the groundwater. The solar aeration component at the other end can continuously aerate the groundwater well after continuously receiving solar energy to store electricity. The intensity of the aeration device is controlled by observing the dissolved oxygen concentration in the groundwater displayed by the dissolved oxygen monitoring device to ensure the oxygen supply concentration of aerobic microorganisms. Continuous aeration also accelerates the oxidative degradation rate of chlorobenzene.

[0021] Principle of aerobic microbial degradation of chlorobenzene: aerobic microbial strains are tamed and maintained using original contaminated groundwater. Since aerobic microorganisms contain dioxygenases, dehydrogenases and enzymes that cause ortho-cleavage of the benzene ring, under sufficient oxygen conditions, aerobic microorganisms use organic pollutants such as chlorobenzene in the water as substrates for aerobic metabolism, causing chlorobenzene to first open its ring to form the corresponding acid, which is then dechlorinated through a catalytic reaction. After a series of biochemical reactions, energy is released step by step, and it is finally stabilized as low-energy inorganic matter to achieve the requirement of harmlessness.

[0022] In an embodiment of the present utility model, a first flowmeter 11 is provided on the water outlet pipe connecting the first water pump 3 and the mixing tank 1, and a second flowmeter 12 and a flow regulating valve 13 are provided on the pipeline where the water outlet of the regulating tank 4 extends into the groundwater remediation well.

[0023] In an embodiment of the present utility model, a stirrer 14 is installed in the mixing tank 1, and a third flowmeter is provided at the bacterial liquid outlet of the bacteria adding tank 2.

[0024] In an embodiment of the present utility model, the temperature monitoring and regulating device 5 includes a temperature sensor and a heating wire, the pH value monitoring and regulating device 6 includes a pH sensor and a pH automatic dosing machine, the dissolved oxygen monitoring and regulating device 7 includes a dissolved oxygen sensor and a blower 15, the blower 15 injects air into the liquid in the regulating tank 4 through an aeration pipe, and the blower 15 and the dissolved oxygen sensor are electrically connected to a controller.

[0025] In an embodiment of the present utility model, the dissolved oxygen on-line monitoring component includes a dissolved oxygen monitor provided on the ground beside the groundwater remediation well, and the dissolved oxygen monitor is electrically connected to a detection probe extending into the water body of the groundwater remediation well through a cable.

[0026] In an embodiment of the present utility model, the solar aeration component includes a solar panel 17, an aeration air pump 18 and an aeration pipe. The solar panel 17 is electrically connected to the aeration air pump 18, one end of the aeration pipe is communicated with the gas outlet of the aeration air pump 18, and the other end extends into the water body in the groundwater remediation well.

[0027] The following is an explanation of the use of the device for treating chlorobenzene in groundwater by aerobic microorganisms in combination with specific operation steps:

[0028] The first water pump is mainly used to pump the original polluted water body in the groundwater well and control the amount entering the mixing tank through a flowmeter. The bacteria adding tank contains aerobic microorganism strains, and the amount of aerobic microorganism strains added to the mixing tank is controlled through a flowmeter. A stirrer is installed in the mixing tank, and the aerobic microorganism strains and the original polluted water body are fully mixed under the action of the built-in stirrer. The mixed aerobic microorganism strain liquid enters the regulating tank through an external second water pump through a pipeline;

[0029] The regulating tank monitors and adjusts each key parameter through a temperature monitoring and regulating device, a pH value monitoring and regulating device and a dissolved oxygen monitoring and regulating device to control the growth environment of the aerobic microorganism strain liquid, so that the temperature is maintained at 20°C to 30°C and the pH is controlled within the range of 6.0 - 8.5. After the aerobic microorganism strain liquid is maintained in the regulating tank for about 3 days, the maintained and strengthened aerobic microorganism strain liquid then enters a self-priming pump (the third water pump) through a pipeline;

[0030] The self-priming pump controls the passing volume of the well-maintained aerobic microbial strain liquid through flow monitoring. According to the dosing ratio of 30-40 liters of the strain liquid per cubic meter of polluted water, 5 liters of the well-maintained aerobic microbial strain liquid is dosed into the groundwater well every half hour.

[0031] The solar aeration device is equipped with a solar panel and an aeration device. The solar panel converts the energy absorbed from sunlight into electrical energy and stores it. Then, the electrical energy is used to continuously aerate and oxygenate the groundwater well through the aeration device. The dissolved oxygen monitoring device shows the dissolved oxygen concentration in the groundwater, so as to adjust the intensity of the aeration device to ensure the oxygen content in the groundwater. After 3-5 days, the groundwater sample is taken again to detect its chlorobenzene concentration. If the chlorobenzene concentration still does not reach the acceptable level for humans (the limit value calculated according to the site risk assessment), the addition of the strain liquid can be started again until the detected concentration of the water sample reaches the acceptable level.

[0032] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An apparatus for treating chlorobenzene in groundwater using aerobic microorganisms, characterized in that, It includes a bacterial liquid mixing component, a bacterial liquid regulation and enhancement component, a dissolved oxygen on-line monitoring component and a solar aeration component arranged on the ground near the groundwater remediation well. The bacterial liquid mixing component includes a mixing tank (1), a bacterial addition tank (2) and a first water pump (3). The bacterial liquid regulation and enhancement component includes a regulation tank (4) and a temperature monitoring and regulator (5), a pH value monitoring and regulator (6) and a dissolved oxygen monitoring and regulator (7) arranged in the regulation tank (4). The water inlet of the first water pump (3) is communicated with a water diversion pipeline (8), and the other end of the water diversion pipeline (8) extends into the water body of the groundwater remediation well. The water outlet of the first water pump (3) is communicated with the mixing tank (1) through a water outlet pipe. The bacterial addition tank (2) is used to add the original bacterial liquid to the mixing tank (1). The water outlet of the mixing tank (1) is communicated with the liquid inlet of the regulation tank (4) through a pipeline provided with a second water pump (9). The water outlet of the regulation tank (4) is communicated with the groundwater remediation well through a pipeline provided with a third water pump (10). The dissolved oxygen on-line monitoring component is used to monitor the dissolved oxygen content of the water body in the groundwater remediation well in real time. The solar aeration component is used to continuously aerate the water body in the groundwater remediation well.

2. The device for treating chlorobenzene in groundwater by using aerobic microorganisms according to claim 1, wherein, A first flowmeter (11) is arranged on the water outlet pipe connecting the first water pump (3) and the mixing tank (1). A second flowmeter (12) and a flow regulating valve (13) are arranged on the pipeline where the water outlet of the regulation tank (4) extends into the groundwater remediation well.

3. The device for treating chlorobenzene in groundwater using aerobic microorganisms according to claim 1, characterized in that, A stirrer (14) is installed in the mixing tank (1), and a third flowmeter is arranged at the bacterial liquid outlet of the bacterial addition tank (2).

4. The device for treating chlorobenzene in groundwater using aerobic microorganisms according to claim 1, characterized in that, The temperature monitoring and regulator (5) includes a temperature sensor and an electric heating wire. The pH value monitoring and regulator (6) includes a pH sensor and a pH automatic dosing machine. The dissolved oxygen monitoring and regulator (7) includes a dissolved oxygen sensor and a blower (15). The blower (15) injects air into the liquid in the regulation tank (4) through an aeration pipe. The blower (15) and the dissolved oxygen sensor are electrically connected to a controller.

5. The device for treating chlorobenzene in groundwater by aerobic microorganisms according to claim 1, characterized in that, The dissolved oxygen on-line monitoring component includes a dissolved oxygen monitor arranged on the ground beside the groundwater remediation well. The dissolved oxygen monitor is electrically connected to a detection probe extending into the water body of the groundwater remediation well through a cable.

6. A device for treating chlorobenzene in groundwater using aerobic microorganisms according to any one of claims 1 to 5, characterized in that, The solar aeration component includes a solar panel (17), an aeration air pump (18) and an aeration pipeline. The solar panel (17) is electrically connected to the aeration air pump (18). One end of the aeration pipeline is communicated with the gas outlet of the aeration air pump (18), and the other end extends into the water body in the groundwater remediation well.

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