Underground water pollutant removal device

Abstract

The utility model relates to the technical field of water treatment, in particular to an underground water pollutant removal device. Comprising a first filter layer used for blocking large particles in underground water, a second filter layer used for blocking precipitates generated after reaction, a first treatment unit used for removing NO3 <-> and Cr (VI) pollutants in the underground water, a second treatment unit used for removing reaction products and a monitoring pipe used for monitoring water quality, pollutants containing NO3 <->, Cr (VI) and the like released by a pollution source permeate downwards and flow together with water flow to form a pollution halo, the device is arranged on the cross section of a flowing path of the pollution halo, and when the water flow passes through the pollutant removal device, the first filter layer filters solid organic matters, large-particle impurities and the like in underground water, so that the pollutant removal effect is improved. A graphene oxide substrate attached with nano zero-valent iron is arranged in the first treatment unit, NO3 <-> is mainly reduced into NH4 < + > by the first treatment unit, the NH4 < + > is adsorbed and removed by the second treatment unit, and Cr (VI) is reduced into low-toxicity Cr (III), so that the removal of the NO3 <-> and the Cr (VI) is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to water treatment technical field especially is related to a groundwater pollutant removal device. BACKGROUND

[0002] Chromium (Cr) pollution is a typical heavy metal pollution in groundwater, trivalent chromium (Cr (III)) is beneficial to human body, and Cr (VI) has strong toxicity and carcinogenicity, and long-term contact can cause various adverse reactions, such as allergy, skin ulcer, etc. Especially in China, India and other countries with high industrialization, due to the poor environmental management, the Cr (VI) pollution problem is prominent. According to statistics, there are still more than 60 Cr (VI) pollution sites to be solved in China, and the Cr (VI) in groundwater is also very common. The harm of Cr (VI) cannot be ignored, and the relevant standards in China stipulate that the concentration of Cr (VI) in groundwater shall not exceed 0.05mg / L, so as to protect human health and environment, it is very important to control and remove Cr (VI) pollution in groundwater.

[0003] At the same time, nitrate (NO3 – ) as a common pollutant in groundwater, when there is Cr (VI) pollution, often accompanied by NO3 – exceeding standard situation, NO3 – and Cr (VI) form groundwater coexisting pollutants, which has attracted more and more attention. The concentration of NO3 – and Cr (VI) in groundwater increases gradually, which becomes a serious threat to groundwater pollution, therefore, a pollutant removal device is urgently needed to remove Cr (VI) and NO3 – in groundwater. INVENTION CONTENTS

[0004] In order to remove Cr (VI) and NO3 – in groundwater, the utility model provides a groundwater pollutant removal device.

[0005] The groundwater pollutant removal device provided by the utility model adopts the following technical scheme:

[0006] The groundwater pollutant removal device comprises a first filter layer, a second filter layer, a first treatment unit and a second treatment unit, the first treatment unit comprises a support frame and an oxidized graphene base plate, the oxidized graphene base plate is attached with nano zero-valent iron, a containing cavity is arranged in the support frame, an opening is arranged at the upper portion of the containing cavity, the oxidized graphene base plate is arranged in the support frame, the second treatment unit is arranged adjacent to the first treatment unit, the second treatment unit comprises a support frame and zeolite, the zeolite is arranged in the support frame of the second treatment unit, a plurality of water passing holes are arranged on the opposite sides of the two support frames, the sides of the two support frames with the water passing holes are adjacent, a blocking piece is arranged between the two support frames, the first filter layer is arranged on the side of the first treatment unit away from the second treatment unit, and the second filter layer is arranged on the side of the second treatment unit away from the first treatment unit.

[0007] By adopting the above technical scheme, the pollution source releases NO3 – , Cr(VI) and the like together with the water flow to form a pollution halo in the downward infiltration flow, the device is arranged on the cross section of the flow path of the pollution halo, when the water flow passes through the pollutant removal device, the first filter layer filters the solid organic matter and large particle impurities in the water, so as to prevent subsequent blockage of the device, after the groundwater passes through, the high-toxicity Cr(VI) is reduced to low-toxicity Cr(III) by the nano zero-valent iron, the nano zero-valent iron reacts with NO3 – to generate ammonia nitrogen (NH4 + ), NH4 + is the main product of the reduction of NO3 – , NH4 + is removed by the zeolite in the second treatment unit, the nano zero-valent iron is changed into iron oxide (Fe2O3, Fe3O4) and precipitates, and the pollutants in the groundwater are removed, the oxidized graphene base plate can modify the nano zero-valent iron, maintain the high activity of the nano zero-valent iron, and enhance the removal effect on the pollutants.

[0008] Further, quartz sand and sandy soil are further arranged in the support frame of the first treatment unit, and the quartz sand, the sandy soil, the oxidized graphene base plate attached with the nano zero-valent iron and the quartz sand are sequentially arranged in the support frame of the first treatment unit from the direction close to the first filter layer to the direction away from the first filter layer.

[0009] Further, a waterproof layer is arranged at the bottom of the support frame, and the support frame is fixedly connected to the waterproof layer.

[0010] Further, the first filter layer comprises two symmetrically arranged baffle plates, an insert plate and quartz sand, the baffle plates are parallel to the direction of water flow, the side of the baffle plates away from the support frame is provided with a mounting groove, the insert plate is arranged in the mounting groove of the baffle plate, the insert plate and the baffle plate are detachably connected, the end face of the baffle plate close to the support frame is fixedly connected to the support frame, the end face of the baffle plate close to the water-proof layer is fixedly connected to the water-proof layer, the baffle plate is arranged vertically to the water-proof layer, the quartz sand is arranged between the insert plate, the support frame and the two baffle plates, and the second filter layer is symmetrically arranged on the two sides of the blocking piece between the two support frames.

[0011] Further, a plurality of water passing holes are arranged on the insert plate, and the side of the insert plate close to the support frame is fixedly connected with a blocking piece.

[0012] Further, the side of the two support frames close to the insert plate is provided with a blocking piece.

[0013] Further, the blocking piece is a sponge partition.

[0014] Further, the top of the support frame is provided with a top cover, and the top cover and the support frame are rotationally connected.

[0015] Further, the side of the first filter layer away from the second filter layer is provided with a first monitoring pipe, the side of the second filter layer away from the first filter layer is provided with a second monitoring pipe, the first monitoring pipe and the second monitoring pipe are fixedly connected to the water-proof layer, and the first monitoring pipe and the second monitoring pipe are provided with water inlet holes.

[0016] In summary, the utility model has at least one of the following beneficial technical effects:

[0017] 1. By arranging the first processing unit and the second processing unit, when the underground water enters the first processing unit, the graphene oxide substrate attached with nano zero-valent iron in the first processing unit reduces and discharges NO3 – , Cr(VI) in the underground water, the underground water continues to flow into the second processing unit, the zeolite in the second processing unit adsorbs NH4 + generated by the first processing unit, and finally, the reaction precipitate is filtered out through the second filter layer, so that the pollutants in the underground water are removed.

[0018] 2. By arranging the first monitoring pipe and the second monitoring pipe, the water quality of the inlet water and outlet water can be conveniently sampled and detected regularly, and the purification effect is ensured.

[0019] 3. By arranging the first filter layer and the second filter layer, the first filter layer is used for ensuring that the water flow enters the reactor stably and blocking the large-particle impurities in the underground water, so that the large-particle impurities are prevented from entering the processing unit and causing blockage, and the second filter layer is used for intercepting and recovering the solid product. Attached Figure Description

[0020] Figure 1 This is a cross-sectional structural diagram of the entire application;

[0021] Figure 2 This is a schematic diagram of the internal structure of the support frame of the first processing unit of this application;

[0022] Figure 3 This is a schematic diagram of the overall structure of this application;

[0023] Figure 4 This is a structural schematic diagram of the support frame of this application;

[0024] Figure 5 This is a schematic diagram of the structure of the blocking component in this application;

[0025] Reference numerals: 100, support frame; 110, receiving cavity; 120, water passage hole; 130, blocking component; 140, top cover; 150, graphene oxide substrate; 160, zeolite; 200, quartz sand; 300, sand; 400, water-proof layer; 510, baffle; 520, insert plate; 530, mounting groove; 610, first monitoring tube; 620, second monitoring tube; 630, water inlet hole. Detailed Implementation

[0026] The technical solutions of this utility model are clearly and completely described below through specific embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. This utility model can also be implemented or applied through other different specific embodiments. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] The following combination Figures 1-5 The present invention will be described in further detail below.

[0028] This embodiment discloses a groundwater pollutant removal device, referring to... Figure 1 It includes a first filter layer to block large particles in groundwater, a second filter layer to block precipitates formed after the reaction, and a filter layer to remove NO3 from groundwater. –, a first treatment unit for removing Cr(VI), a second treatment unit for removing products generated by the first treatment unit, and a monitoring pipe for monitoring water quality, a graphene oxide substrate 150 is arranged in the first treatment unit, and nano zero-valent iron is attached to the graphene oxide substrate 150, a pollution source releases NO3 – , Cr(VI), etc. together with water flow to form a pollution halo in a downward infiltration flow, the device is arranged on a cross section of the pollution halo flow path, when the water flow passes through the pollution removal device, the first filter layer filters solid organic matter and large particle impurities in the groundwater, preventing subsequent blockage of the device, after the groundwater passes through, the highly toxic Cr(VI) is reduced to low-toxicity Cr(III) by the nano zero-valent iron, the nano zero-valent iron reacts with NO3 – to generate NH4 + , NH4 + is the main product of reducing NO3 – , NH4 + is removed by zeolite 160 in the second treatment unit, the nano zero-valent iron is changed into iron oxide (Fe2O3, Fe3O4) and precipitates, and the pollution of the groundwater is removed.

[0029] Referring to Figure 1 , Figure 3 , the first filter layer, the second filter layer, the first treatment unit, and the second treatment unit are arranged on a cross section of a groundwater pollution halo flow path, the first treatment unit includes a support frame 100 and a graphene oxide substrate 150, the graphene oxide substrate (GO) 150 has nano zero-valent iron attached thereto, the mass of the nano zero-valent iron is greater than the mass of the graphene oxide, specifically, the mass ratio of the graphene oxide and the nano zero-valent iron is 5%, the support frame 100 is provided with a containing cavity 110, the upper part of the containing cavity 110 is provided with an opening, the graphene oxide substrate 150 is arranged in the support frame 100, the opposite two side surfaces of the support frame 100 are provided with a plurality of water passing holes 120, the side surfaces of the two support frames 100 with the water passing holes 120 are adjacent, a blocking piece 130 is arranged between the two support frames 100, the support frame 100 is provided with a waterproof layer 400 at the bottom, the support frame 100 is fixedly connected to the waterproof layer 400, and the height of the support frame 100 is greater than the depth of the groundwater.

[0030] In this way, the graphene oxide substrate (GO) 150 with the nano zero-valent iron attached in the first treatment unit can react with NO3 – , Cr(VI) in the groundwater and generate NH4 + , the zeolite 160 in the second treatment unit can adsorb NH4 + , and NO3 – , Cr(VI) in the groundwater is removed, ensuring the safety of the water, protecting the environment and human health.

[0031] Referring toFigure 2 In the embodiment, the quartz sand 200, the sandy soil 300, the graphene oxide substrate 150 with nano zero-valent iron attached, and the quartz sand 200 are sequentially arranged in the support frame 100 from the direction close to the first filter layer to the direction away from the first filter layer.

[0032] Referring to Figures 3-4 In the embodiment, the first filter layer is arranged on the side of the first treatment unit away from the second treatment unit, the second filter layer is arranged on the side of the second treatment unit away from the first treatment unit, the first filter layer comprises two symmetrically arranged baffle plates 510, plug-in plates 520, and quartz sand 200, the direction of the baffle plate 510 is parallel to the direction of the water flow, the baffle plate 510 is provided with a mounting groove 530 on the side away from the support frame 100, the plug-in plate 520 is arranged in the mounting groove 530 of the baffle plate 510, the plug-in plate 520 is detachably connected with the baffle plate 510, the end face of the baffle plate 510 close to the support frame 100 is fixedly connected to the support frame 100, the end face of the baffle plate 510 close to the water-resisting layer 400 is fixedly connected to the water-resisting layer 400, the baffle plate 510 is arranged perpendicularly to the water-resisting layer 400, the quartz sand 200 is arranged between the plug-in plate 520, the support frame 100, and the two baffle plates 510, the second filter layer is symmetrically arranged with the first filter layer on both sides of the blocking piece 130 between the two support frames 100, the plug-in plate 520 is provided with a plurality of water passing holes 120, and the plug-in plate 520 is fixedly connected with the blocking piece 130 on the side close to the support frame 100.

[0033] In this way, the plug-in plate 520 is mounted into the mounting groove 530 of the baffle plate 510, and then the quartz sand 200 is added inside, which is convenient to disassemble and beneficial to the replacement of the quartz sand 200 in the later period.

[0034] Referring to Figure 3 , Figure 5 The side of the two support frames 100 close to the plug-in plate 520 is provided with the blocking piece 130, the blocking piece 130 is arranged as a sponge partition plate, the sponge partition plate can block the loss of the mixture 150 in the support frame 100, and also prevents the quartz sand 200 in the first filter layer and the second filter layer from entering the support frame 100, and the top of the support frame 100 is provided with a top cover 140, the top cover 140 is rotatably connected with the support frame 100, and the top cover 140 is located on the ground.

[0035] In this way, the groundwater can pass through the sponge partition plate, the quartz sand 200 cannot pass through the sponge partition plate, the loss of the quartz sand 200 in the support frame 100 is prevented, and the graphene oxide substrate 150 can be replaced by opening the top cover 140, which is convenient to use.

[0036] Referring to Figure 3The first monitoring pipe 610 is arranged on the side of the first filter layer away from the second filter layer, the second monitoring pipe 620 is arranged on the side of the second filter layer away from the first filter layer, the first monitoring pipe 610 and the second monitoring pipe 620 are fixedly connected to the waterproof layer 400, the first monitoring pipe 610 and the second monitoring pipe 620 are provided with water inlet holes 630, and the first monitoring pipe 610 and the second monitoring pipe 620 are arranged to protrude from the ground.

[0037] Therefore, the external environment can take out the underground water in the first monitoring pipe 610 and the second monitoring pipe 620, detect the pollutants in the water, and make the water enter the first monitoring pipe and the second monitoring pipe in the water inlet holes 630, so that the water quality of the inflow and outflow water can be conveniently sampled and detected regularly, and the purification effect is ensured.

[0038] The implementation principle of the embodiment is as follows:

[0039] The pollution source releases NO3 – , Cr(VI) and the like together with the underground water flow to form a pollution halo, the device is arranged on the cross section of the flow path of the pollution halo, the plug plate 520 is arranged in the mounting groove 530 of the baffle plate 510, and quartz sand 200 is added into the first filter layer and the second filter layer, when the water flow passes through the pollution removal device, the first filter layer filters the solid organic matter and large-particle impurities in the underground water, prevents subsequent blockage of the device, the high-toxicity Cr(VI) is reduced to low-toxicity Cr(III) by the nano zero-valent iron, the nano zero-valent iron reacts with NO3 – to generate NH4 + , NH4 + is the main product of the reduction of NO3 – , and NH4 + is adsorbed and removed by the zeolite 160 in the second treatment unit, the nano zero-valent iron is changed into iron oxide and precipitated, NO3 – , Cr(VI) in the underground water is removed, and the second filter layer filters the underground water again.

[0040] The external environment can take out the underground water in the first monitoring pipe 610 and the second monitoring pipe 620, detect the pollutants in the water, and make the water enter the first monitoring pipe and the second monitoring pipe in the water inlet holes 630, so that the water quality of the inflow and outflow water can be conveniently sampled and detected regularly, and the purification effect is ensured.

[0041] The above are preferable embodiments of the utility model, and do not limit the protection scope of the utility model, so that: equivalent changes made according to the structure, shape and principle of the utility model should be covered in the protection scope of the utility model.

Claims

1. An apparatus for removing groundwater contaminants, comprising: It includes a first filter layer, a second filter layer, a first treatment unit and a second treatment unit, the first treatment unit includes a support frame and a graphene oxide substrate, the graphene oxide substrate is attached with nano zero-valent iron, a containing cavity is arranged in the support frame, an opening is arranged at the upper part of the containing cavity, the mixture of the graphene oxide substrate and the nano zero-valent iron is arranged in the support frame, a plurality of water passing holes are arranged on the opposite sides of the support frame, the sides of the two support frames with water passing holes are adjacent, a blocking piece is arranged between the two support frames, the first filter layer is arranged on the side of the first treatment unit away from the second treatment unit, and the second filter layer is arranged on the side of the second treatment unit away from the first treatment unit.

2. The groundwater pollutant removal device of claim 1, wherein, The support frame of the first treatment unit is also provided with quartz sand and sandy soil, and the support frame of the first treatment unit is sequentially provided with quartz sand, sandy soil, graphene oxide substrate attached with nano zero-valent iron and quartz sand from the direction close to the first filter layer to the direction away from the first filter layer.

3. The groundwater pollutant removal device of claim 1, wherein, The bottom of the support frame is provided with a waterproof layer, and the support frame is fixedly connected to the waterproof layer.

4. The groundwater pollutant removal device of claim 3, wherein, The first filter layer includes two symmetrically arranged baffle plates, an insert plate and quartz sand, the direction of the baffle plate is parallel to the water flow direction, the side of the baffle plate away from the support frame is provided with a mounting groove, the insert plate is arranged in the mounting groove of the baffle plate, the insert plate and the baffle plate are detachably connected, one end surface of the baffle plate close to the support frame is fixedly connected to the support frame, one end surface of the baffle plate close to the waterproof layer is fixedly connected to the waterproof layer, the baffle plate is arranged vertically to the waterproof layer, the quartz sand is arranged between the insert plate, the support frame and the two baffle plates, and the second filter layer is symmetrically arranged on the two sides of the blocking piece between the two support frames.

5. The groundwater pollutant removal device of claim 4, wherein, The insert plate is provided with a plurality of water passing holes, and the side of the insert plate close to the support frame is fixedly connected with a blocking piece.

6. The groundwater pollutant removal device of claim 4, wherein, The side of the two support frames close to the insert plate is provided with a blocking piece.

7. The groundwater pollutant removal device of claim 5 or 6, wherein, The blocking piece is arranged as a sponge partition.

8. The groundwater pollutant removal device of claim 1, wherein The top of the support frame is provided with a top cover, and the top cover and the support frame are rotationally connected.

9. The groundwater pollutant removal device of claim 3, wherein, The side of the first filter layer away from the second filter layer is provided with a first monitoring pipe, the side of the second filter layer away from the first filter layer is provided with a second monitoring pipe, the first monitoring pipe and the second monitoring pipe are fixedly connected to the waterproof layer, and the first monitoring pipe and the second monitoring pipe are provided with water inlet holes.

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