Air blowing dehydration treatment device for repairing volatile organic polluted underground water

Abstract

The utility model discloses an air blow dehydration treatment device for repairing volatile organic polluted underground water, which comprises an air stripping tower, an air outlet is arranged at the top of the air stripping tower, hollow ball filler is arranged in the middle of the air stripping tower, and a mixing precipitator is arranged at the bottom of the air stripping tower; the water inlet pump is used for pumping the to-be-treated volatile organic polluted underground water to the position above the hollow ball filler; the air blower is used for conveying gas into the air stripping tower through an air inlet formed in the inner wall of the air stripping tower; the air inlet is positioned below the hollow ball filler; volatile organic polluted underground water flows downwards after being treated by the hollow ball filler, and is discharged out of the air stripping tower after being treated by the mixing precipitator; and the gas is contacted with underground water from bottom to top to finish a mass transfer process and is discharged out of the stripping tower through an exhaust outlet.

Description

Technical Field

[0001] The utility model belongs to the field of groundwater pollution remediation, and in particular relates to an air dewatering treatment device for remediating groundwater polluted by volatile organic compounds. Background Art

[0002] The accelerated pace of industrialization and urbanization, coupled with rapid economic development and population density, has brought significant environmental pressures. The surge in industrial activity, in particular, has led to a dramatic increase in the number of contaminated sites, with a wide variety of complex types. These sites encompass a range of highly polluting industries, including petroleum refining, coking, fine chemicals, pharmaceutical manufacturing, and metal smelting and processing. The wastewater, exhaust gas, and solid waste discharged during these production processes, through long-term accumulation and infiltration, have caused serious pollution to the surrounding environment, particularly the groundwater system.

[0003] Groundwater, as an important freshwater resource, is a direct threat to residents' drinking water safety due to its pollution. According to the results of the contaminated site investigation, volatile and semi-volatile organic pollutants (VOCs / SVOCs) and persistent organic pollutants (POPs) have become the main pollutants in groundwater at urban contaminated sites. These pollutants include VOCs / SVOCs such as petroleum pollutants and organochlorine solvents, as well as difficult-to-degrade POPs such as polychlorinated biphenyls, polycyclic aromatic hydrocarbons, and organochlorine pesticides. These micro-polluting organic substances are not only highly toxic and bioaccumulative, but can also cause long-term effects on human health through the amplification effect of the food chain. At the same time, they will also change the physical and chemical properties of water, resulting in a significant deterioration in the quality of drinking water, which cannot meet the drinking water safety standards.

[0004] Therefore, there is an urgent need to provide a water pollution treatment device to solve the above problems. Summary of the Invention

[0005] In view of this, the utility model provides an air dewatering treatment device for repairing groundwater contaminated by volatile organic compounds.

[0006] To achieve the above technical objectives, the present invention provides an air dewatering device for remediating groundwater contaminated by volatile organic compounds. The device comprises:

[0007] A stripping tower, wherein the top of the stripping tower is provided with an exhaust port, the middle of the stripping tower is provided with a hollow ball filler, and the bottom of the stripping tower is provided with a mixing precipitator;

[0008] A water inlet pump, the water inlet pump is used to pump the volatile organic polluted groundwater to be treated to the top of the hollow ball filler;

[0009] A blower, the blower is used to transmit gas into the stripping tower through an air inlet opened on the inner wall of the stripping tower; the air inlet is located below the hollow ball filler;

[0010] After being treated by hollow ball fillers, volatile organic polluted groundwater flows downward, is treated by a mixing sedimentator, and is discharged out of the stripping tower; the gas contacts the groundwater from bottom to top to complete the mass transfer process, and is discharged out of the stripping tower through the exhaust port.

[0011] Furthermore, activated carbon and a demister are sequentially arranged below the exhaust port.

[0012] Furthermore, a spray pipe is arranged above the hollow ball filler, one end of the spray pipe extends into the interior of the stripping tower, and the other end of the spray pipe is located outside the stripping tower and the end is connected to a water inlet pump; wherein, a water inlet nozzle is provided on the surface of the spray pipe extending into the interior of the stripping tower.

[0013] Furthermore, a support frame is installed in the middle of the stripping tower, and hollow ball fillers are placed through the support frame.

[0014] Furthermore, the device further comprises:

[0015] Dosing pump,

[0016] and a dosing pipeline; one end of the dosing pipeline extends into the interior of the stripping tower and the outlet end is located above the mixing precipitator, the other end of the dosing pipeline is located outside the stripping tower and the inlet end is connected to the dosing pump.

[0017] Furthermore, a spiral structure is provided in the mixing sedimentation vessel.

[0018] Furthermore, a conical sludge sedimentation tank is provided below the mixing sedimentation tank;

[0019] A clean water overflow port is provided above the sludge sedimentation tank;

[0020] A mud discharge port is provided at the bottom of the sludge sedimentation tank, and the mud discharge port is connected to a sludge pump outside the stripping tower.

[0021] Furthermore, a turbidity monitor is provided at the clean water overflow port; and a sludge level meter is provided at the conical opening of the sludge sedimentation tank.

[0022] Furthermore, a first electric valve and a first flow meter are provided on an air inlet pipe connected to the blower and the air inlet opened on the inner wall of the stripping tower;

[0023] A second flow meter is provided on the spray pipeline;

[0024] By monitoring the first flow meter and the second flow meter, the first electric valve is controlled to control the water-gas mixing ratio in the hollow ball filler to be 1:30.

[0025] Furthermore, a second electric valve is provided on the dosing pipeline.

[0026] The beneficial effects of the utility model are:

[0027] The utility model provides an air stripping water treatment device for repairing volatile organic polluted groundwater, the device is provided with a stripping tower, the top of the stripping tower is provided with an exhaust port, the middle of the stripping tower is provided with a hollow ball filler, and the bottom of the stripping tower is provided with a mixing precipitator; an inlet pump, the water inlet pump is used to pump the volatile organic polluted groundwater to be treated to the top of the hollow ball filler; a blower, the blower is used to transmit gas to the inside of the stripping tower through an air inlet opened on the inner wall of the stripping tower; the air inlet is located below the hollow ball filler; after the volatile organic polluted groundwater is treated by the hollow ball filler, it flows downward, and after being treated by the mixing precipitator, it is discharged outside the stripping tower; the gas contacts the groundwater from bottom to top to complete the mass transfer process, and is discharged outside the stripping tower through the exhaust port, thereby realizing rapid and effective treatment of the contaminated groundwater. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0029] Figure 1 This is a structural schematic diagram of an air dewatering treatment device for repairing volatile organic polluted groundwater provided by the utility model.

[0030] In the figure, 1-stripping tower, 101-exhaust outlet, 102-activated carbon, 103-demister, 104-support frame, 105-hollow ball filler, 106-air inlet, 107-clean water overflow outlet, 108-mixing sedimentator, 109-sludge sedimentation tank, 110-sludge outlet, 201-blower, 202-sludge pump, 203-dosing pump, 204-water inlet pump, 301-first flow meter, 302-second flow meter, 303-turbidity monitor, 304-sludge liquid level meter, 305-first electric valve, 306-second electric valve, 4-water inlet nozzle. DETAILED DESCRIPTION

[0031] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatuses and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0032] The terms used in this utility model are for the purpose of describing specific embodiments only and are not intended to limit the utility model. As used in this utility model and the appended claims, the singular forms "a," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0033] It should be understood that although the terms first, second, third, etc. may be used in this utility model to describe various information, such information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, first information can also be referred to as second information without departing from the scope of this utility model, and similarly, second information can also be referred to as first information. Depending on the context, the word "if" as used herein can be interpreted as "when...", "when...", or "in response to determining."

[0034] The present invention will be described in detail below with reference to the accompanying drawings. Unless there is any conflict, the features of the following embodiments and implementations may be combined with each other.

[0035] like Figure 1 As shown, an embodiment of the present invention provides an air stripping water treatment device for remediating volatile organic contaminated groundwater. The present invention is based on the theory of gas-liquid phase equilibrium and mass transfer rate. Based on Henry's law, at a certain temperature, when the gas and liquid reach phase equilibrium, the partial pressure of the solute gas in the gas phase is proportional to the concentration of the gas in the liquid phase. For organically contaminated wastewater, the stripping method is to change the gas-liquid equilibrium relationship of these volatile substances dissolved in water by introducing air, causing them to transfer from the liquid phase to the gas phase, and then collect them, purify them through a purification device, and then discharge them into the atmosphere.

[0036] Specifically, the device includes:

[0037] The stripping tower 1 is provided with an exhaust port 101 at the top, and activated carbon 102 and a demister 103 are sequentially provided below the exhaust port 101; a support frame 104 is installed in the middle of the stripping tower 1, and a hollow ball filler 105 is placed through the support frame 104; a mixing precipitator 108 is provided at the bottom of the stripping tower 1.

[0038] Furthermore, a spiral structure is provided in the mixing and settling vessel 108. A conical sludge settling tank 109 is provided below the mixing and settling vessel 108; a clean water overflow port 107 is provided above the sludge settling tank 109; and a sludge discharge port 110 is provided at the bottom of the sludge settling tank 109, which is connected to a sludge pump 202 outside the stripping tower 1.

[0039] Furthermore, a turbidity monitor 303 is provided at the clean water overflow port 107 ; and a sludge level meter 304 is provided at the conical opening of the sludge sedimentation tank 109 .

[0040] The water inlet pump 204 is used to pump the volatile organic-contaminated groundwater to be treated to the top of the hollow ball filler 105; a spray pipe is provided above the hollow ball filler 105, one end of the spray pipe extends into the interior of the stripping tower 1, and the other end of the spray pipe is located outside the stripping tower 1 and the end is connected to the water inlet pump 204; wherein, a water inlet nozzle 4 is provided on the surface of the spray pipe extending into the interior of the stripping tower 1.

[0041] Furthermore, a second flow meter 302 is provided on the spray pipeline.

[0042] The blower 201 is used to transmit gas into the stripping tower 1 through the air inlet 106 opened on the inner wall of the stripping tower 1; the air inlet 106 is located below the hollow ball filler 105.

[0043] Furthermore, a first electric valve 305 and a first flow meter 301 are provided on the air inlet pipeline connecting the blower 201 and the air inlet 106 opened on the inner wall of the stripping tower 1 .

[0044] dosing pump 203, and dosing pipeline; one end of the dosing pipeline extends into the interior of the stripping tower 1 and the outlet end is located above the mixing precipitator 108, and the other end of the dosing pipeline is located outside the stripping tower 1 and the inlet end is connected to the dosing pump 203.

[0045] Furthermore, a second electric valve 306 is provided on the dosing pipeline.

[0046] After being treated by the hollow ball filler 105 , the volatile organic polluted groundwater flows downward, is treated by the mixing precipitator 108 , and is discharged from the stripping tower 1 ; the gas contacts the groundwater from bottom to top to complete the mass transfer process, and is discharged from the stripping tower 1 through the exhaust port 101 .

[0047] Furthermore, by monitoring the first flow meter 301 and the second flow meter 302 , the first electric valve 305 is controlled, thereby controlling the water-gas mixing ratio in the hollow ball filler 105 to be 1:30.

[0048] Next, the working process of the air dewatering treatment device for repairing volatile organic compound contaminated groundwater provided by the utility model is described:

[0049] First, air is sent to the bottom of the hollow ball filler 105 inside the stripping tower 1 through the blower 201; at the same time, the parameters of the second process, i.e. 302, are set, the water inlet pump (variable frequency) 204 is turned on, and the frequency of the water inlet pump 204 is adjusted according to the required flow rate.

[0050] The volatile organic contaminated groundwater to be treated is evenly sprayed onto the hollow ball filler 105 through the water inlet nozzle 4, causing the liquid to flow downward in a film-like shape. Air contacts the liquid film from bottom to top in countercurrent to complete the mass transfer process.

[0051] The stripped gas passes through demister 103 and activated carbon 102, undergoes adsorption filtration, and is then discharged through exhaust port 101. The stripped water flows downward into mixing and settling tank 108. By switching second electric valve 306, chemical (i.e., flocculating agent) is added to mixing and settling tank 108 via dosing pump 203 and a dosing pipeline. The spiral structure in mixing and settling tank 108 uniformly mixes the chemical with the wastewater, flocculating and settling the particulate matter in the wastewater, achieving solid-liquid separation.

[0052] The separated sludge enters the conical sludge settling tank 109. When the sludge reaches a high level, the sludge level meter 304 is triggered to discharge the sludge through the sludge outlet 110 and the sludge pump 202. The separated clean water is discharged through the clean water overflow port 107. A turbidity monitor 303 is installed at the clean water overflow port 107. By detecting the parameters of the turbidity monitor 303, the second electric valve 306 is controlled, thereby controlling the amount of chemical added by the dosing pump 203 to ensure the quality of the treated water.

[0053] The above embodiments are intended only to illustrate the design concepts and features of the present invention, and are intended to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. The scope of protection of the present invention is not limited to the above embodiments. Therefore, any equivalent changes or modifications based on the principles and design concepts disclosed in the present invention are within the scope of protection of the present invention.

Claims

1. An air dewatering device for repairing groundwater contaminated by volatile organic compounds, characterized in that: The device comprises: A stripping tower (1), wherein an exhaust port (101) is provided at the top of the stripping tower (1), a hollow ball filler (105) is provided in the middle of the stripping tower (1), and a mixing precipitator (108) is provided at the bottom of the stripping tower (1); A water inlet pump (204), the water inlet pump (204) is used to pump the volatile organic polluted groundwater to be treated to the top of the hollow ball filler (105); A blower (201), the blower (201) is used to transmit gas into the interior of the stripping tower (1) through an air inlet (106) opened on the inner wall of the stripping tower (1); the air inlet (106) is located below the hollow ball filler (105); After being treated by the hollow ball filler (105), the volatile organic polluted groundwater flows downward, is treated by the mixing sedimentation device (108), and is discharged from the stripping tower (1); the gas contacts the groundwater from bottom to top to complete the mass transfer process, and is discharged from the stripping tower (1) through the exhaust port (101).

2. The air dewatering device for repairing volatile organic compound contaminated groundwater according to claim 1, characterized in that: Activated carbon (102) and a demister (103) are sequentially arranged below the air outlet (101).

3. The air dewatering device for repairing volatile organic compound contaminated groundwater according to claim 1, characterized in that: A spray pipeline is provided above the hollow ball filler (105), one end of the spray pipeline extends into the interior of the stripping tower (1), and the other end of the spray pipeline is located outside the stripping tower (1) and is connected to a water inlet pump (204). A water inlet nozzle (4) is provided on the surface of the spray pipeline extending into the interior of the stripping tower (1).

4. The air dewatering device for repairing volatile organic compound contaminated groundwater according to claim 1, characterized in that: A support frame (104) is installed in the middle of the stripping tower (1), and a hollow ball filler (105) is placed through the support frame (104).

5. The air dewatering device for repairing volatile organic compound contaminated groundwater according to claim 1, characterized in that: The device further comprises: Dosing pump (203), and a dosing pipeline; one end of the dosing pipeline extends into the interior of the stripping tower (1) and the outlet end is located above the mixing sedimentation vessel (108); the other end of the dosing pipeline is located outside the stripping tower (1) and the inlet end is connected to the dosing pump (203).

6. The air dewatering device for repairing volatile organic compound contaminated groundwater according to claim 1, characterized in that: A spiral structure is provided in the mixing sedimentation vessel (108).

7. The air dewatering device for repairing volatile organic compound contaminated groundwater according to claim 1 or 6, characterized in that: A conical sludge sedimentation tank (109) is provided below the mixing sedimentation tank (108); A clean water overflow port (107) is provided above the sludge sedimentation tank (109); A sludge discharge port (110) is provided at the bottom of the sludge sedimentation tank (109), and the sludge discharge port (110) is connected to a sludge pump (202) outside the stripping tower (1).

8. The air dewatering device for repairing volatile organic compound contaminated groundwater according to claim 7, characterized in that: A turbidity monitor (303) is provided at the clean water overflow port (107); and a sludge level meter (304) is provided at the conical opening of the sludge sedimentation tank (109).

9. The air dewatering device for repairing volatile organic compound contaminated groundwater according to claim 3, characterized in that: The air inlet pipe connecting the blower (201) and the air inlet (106) opened on the inner wall of the stripping tower (1) is provided with a first electric valve (305) and a first flow meter (301); A second flow meter (302) is provided on the spray pipeline; By monitoring the first flow meter (301) and the second flow meter (302), the first electric valve (305) is controlled, thereby controlling the water-gas mixing ratio in the hollow ball filler (105) to be 1:

30.

10. The air dewatering treatment device for remediating volatile organic compound contaminated groundwater according to claim 5, characterized in that: A second electric valve (306) is provided on the dosing pipeline.

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