CN203866897U - Filling-pumping double-function well for treating groundwater pollution - Google Patents

Abstract

The utility model relates to a filling-pumping double well for treating groundwater pollution, which is characterized in that: a reaction material well (17) is arranged in a non-point source pollution area, and a well wall pipe (3) is arranged on the inner wall of the reaction material well (17) , the pumping well (18) is inside the well wall pipe (3), the filling reaction material well (17) and the pumping well (18) constitute a double well of "filling-pumping", and the aquifer level of the well wall pipe (3) is set There is a filter pipe (6), the upper part of the well wall pipe (3) is an impermeable pipe (12), and the outer wall of the well wall pipe (3) is provided with a filter (6) and a medium combination material layer (2) is provided, and the medium combination The top of the material layer (2) is filled with clay balls (7) between the outer wall of the impermeable pipe (12) and the ground (9) through the interlayer (5), and the bottom of the well wall pipe (3) is embedded in the bedrock In (8), the pumping pipe (1) is arranged inside the well wall pipe (3). The utility model solves the problems that surface source pollution is difficult to control and groundwater cannot be drunk.

Description

A filling-pumping double well for dealing with groundwater pollution

technical field

The utility model belongs to the technical field of groundwater treatment equipment, and is suitable for large-area groundwater pollution areas, especially a filling-pumping double well for groundwater pollution treatment for important water source areas suffering from groundwater pollution recovery.

Background technique

Non-point source pollution includes agricultural non-point source pollution and urban non-point source pollution. With the development of economic society and agricultural intensification, groundwater environmental problems have gradually developed from point source pollution to non-point source pollution, and from cities to rural areas. Especially in the process of agricultural planting, a large amount of chemical fertilizers, organic fertilizers, and nitrogen-containing pollutants discharged by industry have been infiltrated into groundwater for a long time, and the nitrate content in groundwater has increased. The water quality of a large number of water sources has been polluted, posing a threat to drinking water safety and the ecological environment, and seriously affecting the water supply safety and health of the people. The treatment methods and processes for groundwater pollution mainly include ex-situ treatment methods and in-situ remediation methods. Among them, the ex-situ treatment method is a technology for treating ground water through surface water treatment processes, mainly including polluted soil excavation methods and extraction treatment methods; in-situ treatment methods The remediation method is a technology that omits the extraction process under the condition of human intervention and restores the polluted groundwater in situ, mainly including: in-situ flushing method: injecting remediation materials into the underground polluted place, pumping groundwater downstream, and repeatedly flushing; In-situ chemical oxidation method: inject oxidants into groundwater to react with pollutants; permeable reactive wall method (PRB): through excavating trenches and filling reaction media, groundwater pollutants are intercepted and reacted to degrade pollutants the goal of. Among the above-mentioned methods, the permeable reactive wall (PRB) method is more effective in field application at present, and the PRB method is used for in-situ removal of polluted components in groundwater and soil. PRB is generally installed in the underground aquifer, perpendicular to the flow of groundwater. The reaction materials used are generally zero-valent metals with strong reducing ability (the most common is Fe0), and other activated carbon, ion exchange resin, phosphate And some natural materials such as chitin, zeolite, limestone, organoclay, etc. The structure of PRB has the form of continuous wall and channel, all of which have different applicable conditions, and its design and construction are affected by hydrogeological conditions, especially formation and groundwater flow. PRB also has certain limitations: it is only suitable for the directional diffusion of groundwater pollutants, especially the diffusion of plume pollutants in soil layer or shallow groundwater; the design structure is simple, generally in the form of continuous wall trench structure or channel; The installation depth of PRB is generally about 10m; the filling method of PRB medium is directly filled into the groove; the service life of PRB dielectric material is generally 5 to 7 years, and the dielectric material is difficult to recycle. Therefore, when the depth of the aquifer is relatively deep, especially when solving the problem of surface source pollution of groundwater, the application of permeable reactive wall technology is limited. In 2012, the Shandong Academy of Water Conservancy Research carried out in-situ repair engineering tests of groundwater nitrate pollution, and obtained the invention patent of "a construction process for in-situ repair systems in medium-coarse sand formations" and "a PRB well casing "The utility model patent. Among them, the invention patent is based on the construction technology of in-situ repair, focusing on the field of construction technology, that is, how to build continuous walls, anti-seepage piles, PRB (permeable reactive wall) materials, and single-function water quality monitoring, mainly around the PRB reactive wall , Well layout form and an invention of construction technology. A utility model patent for PRB well casing is only a kind of well casing technology, that is, a small-diameter pipe is installed in the PRB well, which is mainly used for water quality monitoring.

Contents of the invention

The purpose of this utility model is mainly to solve the problem of in-situ restoration of groundwater in non-point source pollution areas, especially the restoration of water quality in groundwater sources and deep aquifers, so as to achieve the two goals of water treatment and water supply. Fill-pump double well for groundwater contamination.

The principle of the utility model is to use the double well method to artificially build a water level funnel for the treatment of pollutants, that is, set up a filling well in the surface source pollution area, build a reaction material well around the inner and outer sides of the well head of the filling well, build a pumping well in the middle, and use the filling The water level difference between the injection well and the pumping well, the groundwater seeps into the pumping well after being filtered and reacted by the filling well, and the groundwater pollutants are removed. The cylindrical space between the pumping well and the formation is the filling space of the reaction medium composite material, the space for the runoff of groundwater and the removal of pollutants; the design of integrating the filling well and the pumping well in one borehole by using the double well construction method , so as to achieve the dual purpose of water treatment and pumping water directly to the water plant. Concrete implementation scheme is as follows:

A filling-pumping double well for treating groundwater pollution is characterized in that: a reaction material well is set in a non-point source pollution area, a well wall pipe is arranged on the inner wall of the reaction material well, and a pumping well is inside the well wall pipe, and the reaction material well is filled with the well The pumping well constitutes a "filling-pumping" double well, the water-bearing layer of the well wall pipe is provided with a filter pipe, the upper part of the well wall pipe is an impermeable pipe, and the outer wall of the well wall pipe is provided with a filter pipe and a medium composite material layer , the upper part of the medium combination material layer is filled with clay balls in the outer wall of the impermeable pipe through the interlayer, the bottom of the well wall pipe is embedded in the bedrock, and the suction pipe is arranged in the well wall pipe, and the well diameter of the pumping well is Between 110cm and 160cm, the inner diameter of the pumping pipe is between 10 and 20cm; clay balls are filled between the well wall pipe of the impermeable pipe and the ground to prevent sewage from entering the well along the well wall pipe, and the clay balls The thickness is generally 0.5m ~ 0.8m, and the lower part of the clay ball is provided with an interlayer.

The utility model solves the problems that non-point source pollution is difficult to control and groundwater is undrinkable. The double well structure only needs to construct a single well to achieve the dual purposes of pollutant removal and water supply. In the state of constant flow pumping, it can ensure that all the water entering the well passes through the combined medium material, and the water quality undergoes primary treatment to achieve the purpose of degradation and removal of pollutants, forming an in-situ groundwater treatment system, and achieving the purpose of water supply through pumping wells , the double well can be widely used in the treatment and water supply of pollutants in groundwater in non-point source pollution areas.

Description of drawings

Fig. 1 is a schematic structural representation of the utility model;

Fig. 2 is a schematic cross-sectional structure diagram of the utility model.

In the figure, 1. Suction pipe, 2. Media combination material layer, 3. Well wall pipe, 4. Formation, 5. Interlayer, 6. Filter pipe, 7. Clay ball, 8. Bedrock, 9. Ground, 10 , groundwater level, 11, reducing agent injection equipment, 12, impermeable pipe, 13, expansion capsule, 14, filling pipe, 15, pressurizing pipe, 16, connecting pipe, 17, reaction material well, 18, pumping well, 19 , Outlet hole. the

Detailed ways

Referring to the accompanying drawings, the utility model is a kind of groundwater pollution treatment filling-pumping double well which is suitable for removing groundwater pollutants in non-point source polluted areas and taking into account water supply. The specific implementation is as follows:

A filling-pumping double well for treating groundwater pollution, characterized in that: a reaction material well 17 is set in the surface source pollution area, a well wall pipe 3 is arranged on the inner wall of the reaction material well 17, and the well wall pipe 3 is a pumping well 18, The filling reaction material well 17 and the pumping well 18 form a "filling-pumping" double well. The water-bearing layer of the well wall pipe 3 is provided with a filter pipe 6. The upper part of the well wall pipe 3 is an impermeable pipe 12. The well wall pipe 3 The outer wall of the filter pipe 6 is provided with a medium composite material layer 2, and the upper layer of the medium composite material layer 2 is filled with clay balls 7 between the outer wall of the impermeable pipe 12 and the ground 9 through the interlayer 5 to prevent sewage from flowing along. The wellbore pipe 3 enters the well, the bottom of the wellbore pipe 3 is embedded in the bedrock 8, the wellbore pipe 3 is provided with a pumping pipe 1, and the diameter of the pumping well 18 is between 110cm and 160cm. The inner diameter of the suction pipe 1 is between 10 and 20 cm; the thickness of the clay ball 7 is generally 0.5 m to 0.8 m.

Use and processing method of the present utility model are as follows:

1. Fill and remove the medium combination material in the cylindrical space of the medium combination material layer 2, and determine the thickness of the combination material according to the pollution concentration of the groundwater and the effect of the medium combination material. The thickness is generally controlled at 50-70cm, in order to prevent the medium The hydraulic separation of composite materials and the filling of medium composite materials adopt the physical jet grouting method or mechanical injection method to fill the medium composite materials into the aquifer.

2. Regular injection of reducing agent: The practical life of the nitrate removal material is generally 7 to 10 years. In order to ensure the recycling of the material, it is necessary to inject reducing agent at both ends of the medium composite material layer 2, and set the reducing agent injection device 11 at In wells in areas where groundwater nitrate treatment is required, the reductant injection equipment 11 is provided with two expandable capsules 13 connected in series and a reductant injection pipe 14, and the reductant injection pipe 14 is provided with a liquid outlet 19, and the expandable capsule 13 is connected with a pressurized pipe 15 and a connecting pipe 16, injecting water into the expandable capsule 13, and under the pressure of the booster pump, the upper and lower expandable capsules 13 expand to block the gap between the filling pipe 14 and the well wall pipe 3. gap, the pipe section between the two expansion capsules 13 forms a reducing agent slurry outflow pipe section, and the reducing agent slurry flows out from the liquid outlet hole 19, and the outflow pipe section can be placed in different positions in the well to apply the reaction material to the treatment well at different positions Reducing agent, the injection of the reducing agent can make the removal material be recycled repeatedly, solve the problem of the service life limitation of the removal material, and can effectively solve the clogging problem of the nitrate removal material;

3. Pumping and water quality monitoring: after regular injection of reducing agent, the reducing agent injection equipment 11 in the filling-pumping double well can be withdrawn, and water quality monitoring instruments can be installed to monitor the groundwater quality in real time, and water can be pumped through the pumping pipe 1. After the existing polluted groundwater in the well is discharged, the groundwater filtered by the removed material is clean groundwater. After the groundwater quality reaches the water quality standard of groundwater sources for drinking water, it can be directly supplied to water plants or users at a fixed flow rate.

Claims (2)

1. A filling-pumping double well for dealing with groundwater pollution, characterized in that: a reaction material well (17) is set in the non-point source pollution area, a well wall pipe (3) is set on the inner wall of the reaction material well (17), and the well wall Inside the pipe (3) is a pumping well (18), the filling reaction material well (17) and the pumping well (18) constitute a double filling-pumping well, and the water-bearing layer of the well wall pipe (3) is provided with a filter pipe (6 ), the upper part of the well wall pipe (3) is an impermeable pipe (12), the outer wall of the well wall pipe (3) is provided with a filter (6), and a medium composite material layer (2) is provided, and the medium composite material layer (2) Clay balls (7) are filled between the outer wall of the impermeable pipe (12) and the ground (9) through the interlayer (5) to prevent sewage from entering the well along the well wall pipe (3). The bottom of (3) is embedded in the bedrock (8), and the suction pipe (1) is arranged in the well wall pipe (3). 2. According to claim 1, the groundwater pollution treatment filling-pumping double well is characterized in that: the diameter of the pumping well (18) is between 110cm and 160cm, and the diameter of the pumping pipe (1) The inner diameter is between 10-20cm; the thickness of the clay ball (7) is generally 0.5m-0.8m.