CN212198810U

CN212198810U - System for utilize air supporting device to restore combined pollution groundwater that contains petroleum hydrocarbon

Info

Publication number: CN212198810U
Application number: CN202020338121.8U
Authority: CN
Inventors: 刘军; 赵坤; 蔡琳琳; 戴昕; 洪有成
Original assignee: Nanjing Wondux Environmental Protection Technology Co ltd
Current assignee: Nanjing Wondux Environmental Protection Technology Co ltd
Priority date: 2020-03-17
Filing date: 2020-03-17
Publication date: 2020-12-22
Anticipated expiration: 2030-03-17

Abstract

The utility model discloses a system for repairing petroleum hydrocarbon-containing composite polluted groundwater by using an air floatation device, which comprises a pumping device, a collecting tank, an air floatation tank, a catalytic oxidation tank, a sedimentation tank and an adsorption tank which are connected in sequence; the pumping device is used for pumping the polluted underground water to the collecting tank; the air floatation tank is used for removing refractory substances such as petroleum hydrocarbon and the like; the catalytic oxidation tank is used for further oxidizing and degrading organic matters and reducing the dosage of an oxidizing agent; the sedimentation tank is used for removing heavy metal pollutants; the adsorption tank is used for further filtering partial heavy metal and organic matter, so that the aim of removing various pollutants such as heavy metal, organic matter and petroleum hydrocarbon is fulfilled, and the effluent reaches the standard and is discharged.

Description

System for utilize air supporting device to restore combined pollution groundwater that contains petroleum hydrocarbon

Technical Field

The utility model relates to a groundwater processing technology field, concretely relates to utilize system that air supporting device restoreed the combined pollution groundwater that contains petroleum hydrocarbon.

Background

A large number of industrial and chemical enterprises in cities are closed and moved, so that the left site soil and underground water are polluted to different degrees. According to the 'notice about strengthening the pollution control work in the process of closing and moving industrial enterprises and re-developing and utilizing original sites', 'the polluted sites are developed and utilized again and need to be treated harmlessly', the polluted soil and underground water need to be treated. According to investigation, most of the ground water in the land is polluted by complex including heavy metals, organic matters, and petroleum hydrocarbons. The petroleum hydrocarbon has low water solubility, can stay in soil pore media for a long time, and brings persistent pollution to underground water. There is an urgent need for an economical, rapid and effective method for removing underground water polluted by petroleum hydrocarbon and heavy metal.

For the groundwater with combined pollution, chemical oxidation and microbiological methods are mostly adopted at present to firstly remove organic matters and then precipitate heavy metals. The chemical oxidation method has the disadvantages of large dosage of medicament, easy generation of new pollution, incomplete restoration, long restoration period by the microbiological method and low efficiency.

Patent CN 110182987A provides a method for repairing the composite polluted groundwater of the automobile repair electroplating site, which comprises the steps of firstly carrying out oxidation treatment on organic pollution, simultaneously removing an organic chelating agent interfering with heavy metal precipitation, and finally adding a reductive heavy metal stabilizer into the groundwater of the polluted site to achieve the purpose of further repairing. The technical waste water is directly oxidized by a Fenton reagent to treat petroleum hydrocarbon, and suspended matters and petroleum hydrocarbon substances in Fenton coming water are not effectively removed, so that the dosage of Fenton is increased, and the effectiveness of Fenton is reduced.

The air floatation is that a dissolved air system generates a large amount of micro bubbles in water, so that air is attached to suspended particles in a highly dispersed micro bubble form to cause the density to be lower than that of the water, and the air floats on the water surface by utilizing the buoyancy principle, thereby realizing solid-liquid separation.

With the stricter and stricter environmental protection requirements, for the composite underground water pollutants, the application of a plurality of process cooperative treatment technologies is the leading direction of underground water remediation.

Disclosure of Invention

The utility model overcomes the difficult problems of long treatment time, many medicament addition amounts, incomplete repair and the like in the process of repairing the composite polluted underground water containing petroleum hydrocarbon in the prior art, and provides a system for repairing the composite polluted underground water containing petroleum hydrocarbon by using an air floatation device.

In order to solve the above problem, the utility model discloses a scheme as follows: a system for repairing petroleum hydrocarbon-containing combined polluted underground water by using an air floatation device is characterized in that: the system comprises a pumping device, a collecting tank, an air floatation tank, a catalytic oxidation tank, a sedimentation tank and an adsorption tank which are connected in sequence; the pumping device is used for pumping the polluted underground water to the collecting tank; the air floatation tank is used for removing refractory substances such as petroleum hydrocarbon and the like; the catalytic oxidation tank is used for further oxidizing and degrading organic matters and reducing the dosage of an oxidizing agent; the sedimentation tank is used for removing heavy metal pollutants; the adsorption tank is used for further filtering partial heavy metal and organic matter, so that the aim of removing various pollutants such as heavy metal, organic matter and petroleum hydrocarbon is fulfilled, and the effluent reaches the standard and is discharged.

Further, according to the above design scheme, the system for remedying the petroleum hydrocarbon-containing polluted underground water by using the air flotation device is characterized in that: the air floatation tank is connected with a PAM dosing device; the catalytic oxidation tank is connected with an oxidant dosing device; an aeration device is arranged in the catalytic oxidation tank; and a PAC (polyaluminium chloride), PAM (polyacrylamide), heavy metal capture agent dosing device and a liquid caustic soda dosing device are arranged in the sedimentation tank.

Further, according to the above design scheme, the system for remedying the petroleum hydrocarbon-containing polluted underground water by using the air flotation device is characterized in that: and the oxidizing agent in the oxidant dosing device is a Fenton reagent and an acid regulator.

Further, according to the above design scheme, the system for remedying the petroleum hydrocarbon-containing combined polluted underground water by using the air flotation device is characterized in that the pumping device is communicated with the bottom of the collecting tank through a pipeline; the collecting tank is communicated with a central water inlet of the air floatation tank through an upper water outlet; the air floatation tank is communicated with a central water inlet of the catalytic oxidation tank through an upper water outlet; the catalytic oxidation tank is communicated with a central water inlet of the sedimentation tank through an upper water outlet; the sedimentation tank is communicated with the central water inlet of the adsorption tank through an upper water outlet.

Further, according to the above design scheme, the system for remedying the petroleum hydrocarbon-containing polluted underground water by using the air flotation device is characterized in that: a water stopping system is arranged around the polluted underground water, a water stopping curtain is arranged around the polluted underground water by using cement stirring piles in the water stopping system, adjacent stirring piles are mutually lapped, and the depth of the water stopping curtain is greater than the pollution depth.

Further, according to the above design scheme, the system for remedying the petroleum hydrocarbon-containing polluted underground water by using the air flotation device is characterized in that: the pumping device comprises a drainage well; the drainage wells are arranged in a triangular shape in the range of polluted underground water, and the well spacing of the drainage wells is 12-20 m; a well pipe is arranged in the drainage well, the well pipe is made of PVC, and a strainer is arranged in the well pipe; the outside of the water filter pipe is wrapped with a filter screen bag, gravel materials are filled between the well pipe and the well hole wall of the drainage well, and the upper clay hole is sealed; each drainage well is provided with a deep well pump; the pumped groundwater is collected in a collection pond.

The technical effects of the utility model are as follows: utilize extraction device to take out contaminated groundwater to the collecting pit, petroleum hydrocarbon refractory material is got rid of earlier to high-efficient air supporting device, and catalytic oxidation pond is used for further oxidative degradation organic matter, reducible oxidation agent quantity, and the sedimentation tank is used for getting rid of heavy metal class pollutant, and last adsorption tank is used for further filtering part heavy metal and organic matter, reaches the purpose of getting rid of heavy metal, organic matter, the multiple pollutant of petroleum hydrocarbon, and the play water is discharge up to standard.

Drawings

FIG. 1 is a flow diagram of a system for remediating complex contaminated groundwater containing petroleum hydrocarbons using an air flotation device.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

A system for repairing petroleum hydrocarbon-containing composite polluted underground water by using an air floatation device comprises a pumping device, a collecting tank, an air floatation tank, a catalytic oxidation tank, a sedimentation tank and an adsorption tank which are sequentially connected; the pumping device is used for pumping the polluted underground water to the collecting tank; the air floatation tank is used for removing refractory substances such as petroleum hydrocarbon and the like; the catalytic oxidation tank is used for further oxidizing and degrading organic matters and reducing the dosage of an oxidizing agent; the sedimentation tank is used for removing heavy metal pollutants; the adsorption tank is used for further filtering partial heavy metal and organic matter to achieve the aim of removing various pollutants such as heavy metal, organic matter and petroleum hydrocarbon, and the effluent reaches the discharge standard; the air floatation tank is connected with a PAM dosing device; the catalytic oxidation tank is connected with an oxidant dosing device; an aeration device is arranged in the catalytic oxidation tank; a PAC, PAM and heavy metal trapping agent dosing device and a liquid caustic soda dosing device are arranged in the sedimentation tank; the oxidizing agent in the oxidant dosing device is a Fenton reagent and an acid regulator; the pumping device is communicated with the bottom of the collecting tank through a pipeline; the collecting tank is communicated with a central water inlet of the air floatation tank through an upper water outlet; the air floatation tank is communicated with a central water inlet of the catalytic oxidation tank through an upper water outlet; the catalytic oxidation tank is communicated with a central water inlet of the sedimentation tank through an upper water outlet; the sedimentation tank is communicated with a central water inlet of the adsorption tank through an upper water outlet; a water stopping system is arranged around the polluted underground water, a water stopping curtain is arranged around the polluted underground water by using cement stirring piles in the water stopping system, adjacent stirring piles are mutually lapped, and the depth of the water stopping curtain is greater than the pollution depth; the pumping device comprises a drainage well; the drainage wells are arranged in a triangular shape in the range of polluted underground water, and the well spacing of the drainage wells is 12-20 m; a well pipe is arranged in the drainage well, the well pipe is made of PVC, and a strainer is arranged in the well pipe; the outside of the water filter pipe is wrapped with a filter screen bag, gravel materials are filled between the well pipe and the well hole wall of the drainage well, and the upper clay hole is sealed; each drainage well is provided with a deep well pump; the pumped groundwater is collected in a collection pond.

Example 1: the concentration of pollutants before and after the groundwater in a certain polluted site is treated by the technology of the application is as follows, so that the remediation target is achieved.

Example 2: the concentration of pollutants before and after the groundwater in a certain polluted site is treated by the technology of the application is as follows, so that the remediation target is achieved.

The system for repairing the petroleum hydrocarbon-containing composite polluted underground water by using the air flotation device comprises a pumping device, a collecting tank, an air flotation tank, a catalytic oxidation tank, a sedimentation tank and an adsorption tank which are sequentially connected; the pumping device is used for pumping the polluted underground water to the collecting tank; the air floatation tank is used for removing refractory substances such as petroleum hydrocarbon and the like; the catalytic oxidation tank is used for further oxidizing and degrading organic matters and reducing the dosage of an oxidizing agent; the sedimentation tank is used for removing heavy metal pollutants; the adsorption tank is used for further filtering partial heavy metal and organic matter, so that the aim of removing various pollutants such as heavy metal, organic matter and petroleum hydrocarbon is fulfilled, and the effluent reaches the standard and is discharged.

Claims

1. A system for repairing petroleum hydrocarbon-containing combined polluted underground water by using an air floatation device is used for repairing polluted underground water, and is characterized in that: the system comprises a pumping device, a collecting tank, an air floatation tank, a catalytic oxidation tank, a sedimentation tank and an adsorption tank which are sequentially communicated;

the pumping device is used for pumping the polluted underground water to the ground to the collecting tank;

the collecting tank is used for storing pumped polluted underground water and performing primary precipitation;

the air floatation tank is used for removing refractory substances of petroleum hydrocarbon;

the catalytic oxidation tank is used for further oxidizing and degrading organic matters and reducing the dosage of an oxidizing agent;

the sedimentation tank is used for removing heavy metal pollutants;

the adsorption tank is used for further filtering partial heavy metal and organic matter, so that the aim of removing various pollutants such as heavy metal, organic matter and petroleum hydrocarbon is fulfilled, and the effluent reaches the standard and is discharged.

2. The system for remediating petroleum hydrocarbon contaminated groundwater using an air flotation device as recited in claim 1, wherein: the air floatation tank is connected with a PAM dosing device; the catalytic oxidation tank is connected with an oxidant dosing device; an aeration device is arranged in the catalytic oxidation tank; and a PAC (polyaluminium chloride), PAM (polyacrylamide), heavy metal capture agent dosing device and a liquid caustic soda dosing device are arranged in the sedimentation tank.

3. The system for remediating petroleum hydrocarbon contaminated groundwater using an air flotation device as recited in claim 2, wherein: and the oxidizing agent in the oxidant dosing device is a Fenton reagent and an acid regulator.