A device for treating contaminated groundwater and soil

Abstract

The present application discloses a device for treating polluted groundwater and soil, which relates to the technical field of groundwater and soil pollution treatment. It can not only treat polluted groundwater and polluted soil simultaneously, but also further improve the treatment effect by setting a photocatalytic column in the reaction chamber. The device includes a soil pretreatment and adjustment system and a pollutant treatment system; the soil pretreatment and adjustment system includes a feed inlet, a groundwater inlet and a mixed liquid outlet; the feed inlet is used for putting in polluted soil, and the groundwater inlet is connected to the polluted groundwater source; the mixed liquid outlet is connected to the pollutant treatment system; the pollutant treatment system includes a reaction chamber; the reaction chamber includes an exhaust port and a liquid discharge port; the exhaust port is connected to an exhaust gas chamber; the liquid discharge port is successively connected to a second adjustment chamber and a mud-water separation chamber; a microporous aerator, an electrode column group and a photocatalytic reaction column are arranged in the reaction chamber.

Description

Technical Field

[0001] This application relates to the technical field of groundwater and soil pollution treatment, and particularly to a device for treating polluted groundwater and soil. Background Art

[0002] In recent years, with the continuous development of the economy, the problems of soil pollution and urban groundwater pollution are very serious, and in the same area, groundwater pollution often occurs together with soil pollution.

[0003] The Chinese patent "A Synergistic Treatment Method of Pulse Current and Permeable Reactive Wall for Removing Pollutants in Soil and Groundwater" (Publication No.: CN110697968A) provides a synergistic treatment method of pulse current and permeable reactive wall for removing pollutants in soil and groundwater. It separates pollutants from soil particles by changing the positive and negative poles of the pulse current, enables the pollutants to migrate in the soil and groundwater media, and allows the pollutants to pass through the pre-set continuous or discontinuous permeable reactive wall, so as to achieve the purpose of removing pollutants. However, this method is only applicable to sites with relatively shallow groundwater depth and large-scale pollution plumes, and will cause certain interference to the natural groundwater flow field. Summary of the Invention

[0004] The embodiments of this application provide a device for treating polluted groundwater and soil, which can not only treat polluted groundwater and polluted soil simultaneously, but also further improve the treatment effect by arranging photocatalytic columns in the reaction chamber.

[0005] To achieve the above object, the embodiments of this application provide a device for treating polluted groundwater and soil, including a soil pretreatment and regulation system and a pollutant treatment system; the soil pretreatment and regulation system includes a feed port, a groundwater inlet and a mixed liquid outlet; the feed port is used for putting in polluted soil, the groundwater inlet is connected to the polluted groundwater source; the mixed liquid outlet is connected to the pollutant treatment system; the pollutant treatment system includes a reaction chamber; the reaction chamber includes an exhaust port and a liquid discharge port; the exhaust port is connected to an exhaust gas chamber; the liquid discharge port is sequentially connected to a second regulation chamber and a mud-water separation chamber; a microporous aerator, an electrode column group and a photocatalytic reaction column are arranged in the reaction chamber.

[0006] Further, the photocatalytic reaction column includes a cylinder body and a light source, a photocatalyst filler and a flushing pipe arranged in the cylinder body; the cylinder body includes an upper accommodation cavity and a lower accommodation cavity that are connected to each other; the light source is connected to the top of the upper accommodation cavity and extends along the axis of the cylinder body to the lower accommodation cavity; through holes are arranged on the side wall of the upper accommodation cavity; the photocatalyst filler is located in the upper accommodation cavity; the flushing pipe is located in the lower accommodation cavity.

[0007] Further, the photocatalyst filler is sodium alginate-coated PANI / MoS 2 / MCM-41.

[0008] Further, the preparation method of the photocatalyst filler includes the following steps: Step 1, synthesize mesoporous MCM-41 molecular sieve: 1.1, add 0.5 g of CTAB to 96 mL of deionized water and stir for 3 h; 1.2, add 34 mL of ethanol and 10 mL of 25% ammonia water solution, mix and stir for 5 min; 1.3, add 2.0 mL of TEOS solution while stirring and continue to stir at room temperature for 3 h; 1.4, filter the solution, wash the solid product three times with deionized water and ethanol, and dry it in an oven at 60 °C for 12 hours and then grind it; 1.5, place the ground product in a tubular furnace and calcine it at 540 °C for 9 h and then grind it thoroughly to obtain mesoporous MCM-41 molecular sieve; Step 2, synthesize MoS2 / MCM-41: 2.1, add 0.024 g of MCM-41 to 70 ml of deionized water and stir for 2 h; 2.2, add 2.47 g of ammonium heptamolybdate and 2.4 g of thiourea, mix and stir for 30 min, and adjust the pH value to 3 with 1 M dilute hydrochloric acid; 2.3, transfer the solution to a 100 ml steel autoclave with a Teflon liner and react at 220 °C for 6 h; 2.4, filter the obtained product, wash it three times with deionized water and ethanol respectively, dry it in an oven at 60 °C for 12 hours, and then grind it thoroughly to obtain MoS2 / MCM-41; Step 3, synthesize PANI / MoS2 / MCM-41: 3.1, add 0.43 g of MoS2 / MCM-41 to 100 ml of 1 M hydrochloric acid solution and stir thoroughly for 2 h; 3.2, add 1.86 ml of aniline to the solution and stir in an ice bath for 1 h to make solution A; 3.3, add 4.56 g of ammonium persulfate to 100 ml of 1 M hydrochloric acid solution, stir in an ice bath for 1 h and then make solution B; 3.4, quickly add solution B to solution A that is continuously stirred in an ice bath, continue to stir for 20 min, stop stirring, ice bath the solution for 18 h, filter the obtained solid, wash it three times with deionized water and ethanol respectively, dry it in an oven at 60 °C for 12 hours, and then grind it thoroughly to obtain PANI / MoS2 / MCM-41; Step 4, encapsulate sodium alginate: place 8 g of PANI / MoS2 / MCM-41 and 3 g of sodium alginate in 100 ml of deionized water, stir thoroughly for 30 min, drop the obtained solvent into 40 g / L calcium chloride solution drop by drop, place it at room temperature overnight, wash it three times with deionized water and then air dry to obtain sodium alginate microspheres.

[0009] Further, the material of the cylinder is plexiglass; the light source is an ultraviolet light source.

[0010] Further, the through hole is coated with a stainless steel filter net.

[0011] Further, the mud-water separation chamber is located below the second adjustment chamber. A plate-and-frame that can be turned over up and down is provided in the mud-water separation chamber, and a filter membrane is laid on the plate-and-frame.

[0012] Further, the soil pretreatment and adjustment system includes a housing and a coarse screen, a crushing roller set, and a fine filter screen that are sequentially arranged in the housing from top to bottom; the coarse screen, the crushing roller set, and the fine filter screen divide the inner cavity of the housing into a coarse screening chamber, a crushing chamber, a fine screening chamber, and a first adjustment chamber; the feed port is located at the top of the coarse screening chamber, and the groundwater inlet and the mixed liquid outlet are both located on the side wall of the first adjustment chamber.

[0013] Further, a first pH value detector, a first chemical dosing device, and a first adjustment chamber stirring mixer are provided inside the first adjustment chamber; a second pH value detector, a second chemical dosing device, and a second adjustment chamber stirring mixer are provided inside the second adjustment chamber.

[0014] Further, the first adjustment chamber and the adjustment chamber are respectively located on both sides of the reaction chamber, and a reaction chamber inlet valve is provided between the reaction chamber and the first adjustment chamber; a reaction chamber outlet valve is provided between the reaction chamber and the second adjustment chamber.

[0015] The present application has the following beneficial effects compared with the prior art:

[0016] 1. The device for treating polluted groundwater and soil in the embodiment of the present application can treat polluted groundwater and polluted soil simultaneously.

[0017] 2. The device for treating polluted groundwater and soil in the embodiment of the present application uses PANI / MoS2 / MCM-41 coated with sodium alginate as the photocatalyst filler, and this filler has a strong adsorption effect on pollutants and can catalytically degrade various pollutants including hexavalent chromium and organic pollutants.

[0018] 3. The device for treating polluted groundwater and soil in the embodiment of the present application uses a turnable plate-and-frame filtering device that utilizes gravity filtration, which is convenient for removing the filter substances in the mud-water separation chamber. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 It is a schematic structural diagram of the device for treating polluted groundwater and soil in the embodiment of the present application;

[0021] Figure 2 It is a top view of the reaction chamber in the device for treating contaminated groundwater and soil in the embodiment of the present application;

[0022] Figure 3 It is a schematic structural diagram of the photocatalytic reaction column in the device for treating contaminated groundwater and soil in the embodiment of the present application. Specific embodiments

[0023] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0024] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0025] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0026] The terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise stated, the meaning of "a plurality" is two or more.

[0027] See Figure 1 , the embodiment of the present application provides a device for treating contaminated groundwater and soil, including a support platform 1 and a soil pretreatment and adjustment system 2 and a pollutant treatment system 3 provided on the support platform 1.

[0028] Among them, the support platform 1 includes a support plate 11 arranged on a horizontal plane and a support steel frame 12 fixedly connected to the support plate 11. The support steel frame 12 supports the bottoms of the soil pretreatment and adjustment system 2 and the pollutant treatment system 3.

[0029] The soil pretreatment and conditioning system 2 comprises a housing 21 and a coarse screen 22, a crushing roller group and a fine filter 23 which are sequentially arranged in the housing 21 from top to bottom. The housing 21 is a cavity with an opening facing upward, and its top opening is a feed port 211 for feeding contaminated soil. The coarse screen 22, the crushing roller group and the fine filter 23 divide the inner cavity of the housing 21 into a coarse screen chamber 24, a crushing chamber 25, a fine screen chamber 26 and a first conditioning chamber 27.

[0030] The coarse screen 22 is fixed in the coarse screen chamber 24 by a spring (not shown in the figure), and the coarse screen motor 241 is also fixedly connected to the outer wall of the coarse screen chamber 24. The coarse screen 22 is connected to the coarse screen motor 241 through the coarse screen chamber transmission lever 242, thereby, the coarse screen motor 241 can drive the coarse screen 22 to vibrate.

[0031] The coarse screen 22 is a disc-shaped metal mesh with a mesh size of 20 to 80, and the angle between it and the horizontal plane is 15° to 30°. A coarse screen debris discharge port 243 is also provided on the side wall of the coarse screen chamber 24. The position of the coarse screen debris discharge port 243 corresponds to the lowest point of the coarse screen 22. Therefore, large-sized soil blocks or debris that cannot pass through the coarse screen 22 can be discharged from the coarse screen debris discharge port 243.

[0032] The crushing roller group includes two crushing rollers 251 rotating in opposite directions. Both crushing rollers 251 penetrate the crushing chamber 25 and are connected to corresponding crushing motors (not shown in the figure) through a crushing roller transmission rod (not shown in the figure).

[0033] Similar to the coarse screen 22, the fine screen 23 is also fixed in the fine screen chamber 26 by a spring (not shown in the figure). The fine screen motor 261 is also fixedly connected to the outer wall of the fine screen chamber 26. The fine screen 23 is connected to the fine screen motor 261 through the fine screen chamber transmission lever 262, thereby, the fine screen motor 261 can drive the fine screen 23 to vibrate.

[0034] The fine screen 23 is a disc-shaped metal mesh with a mesh size of 100 to 200, and the angle between it and the horizontal plane is 15° to 30°. A fine screen debris discharge port 263 is also provided on the side wall of the fine screen chamber 26. The position of the fine screen debris discharge port 263 corresponds to the lowest point of the fine screen 23. Thus, lumps of soil or debris that cannot pass through the fine screen 23 can be discharged from the fine screen debris discharge port 263.

[0035] The first regulating chamber 27 is provided with a first pH value detector (not shown), a first doser (not shown) and a first regulating chamber stirring mixer 271. The side wall of the first regulating chamber 27 is provided with a groundwater inlet 272 and a mixed liquid outlet 273.

[0036] A groundwater inlet pipe 28 is provided at the groundwater inlet 272. The upper end of the groundwater inlet pipe 28 is connected to the groundwater inlet 272, and the lower end is connected to the contaminated groundwater source 4. The lower end of the groundwater inlet pipe 28 is wrapped with a stainless steel filter screen 281, and a turbidity flow pump 29 is provided on the groundwater inlet pipe 28. Thus, the turbidity flow pump 29 can suck the contaminated groundwater source 4 into the first adjustment chamber 27, mix it with the contaminated soil in proportion, and part of the pollutants enter the water from the soil, and then adjust the pH value of the mud-water mixture according to the main pollutants. The mixed liquid outlet 273 is communicated with the pollutant treatment system 3.

[0037] The turbidity flow pump 29 is arranged on the support plate 11, and holes are opened on the support plate 11 for the groundwater inlet pipe 28 to pass through.

[0038] The pollutant treatment system 3 includes a reaction chamber 31, an exhaust gas chamber 32, a second adjustment chamber 33 and a mud-water separation chamber 34. The second adjustment chamber 33 and the first adjustment chamber 27 are respectively located on both sides of the reaction chamber 31, and the exhaust gas chamber 32 is located above the reaction chamber 31.

[0039] The reaction chamber 31 includes a liquid inlet, an exhaust port 311 and a liquid discharge port. The liquid inlet is communicated with the mixed liquid outlet 273, and a reaction chamber inlet valve 311 is provided between the two. The exhaust port 311 is communicated with the exhaust gas chamber 32. The liquid discharge port is successively communicated with the second adjustment chamber 33 and the mud-water separation chamber 34. Microporous aerators 319, an electrode column group and a plurality of photocatalytic reaction columns 312 are alternately arranged in the reaction chamber 31.

[0040] Specifically, referring to Figure 2 , there are a plurality of microporous aerators 319, and all the plurality of microporous aerators 319 are located at the bottom of the reaction chamber 31. An aeration blower (not shown in the figure) and an ozone generator (not shown in the figure) are provided outside the reaction chamber 31. The microporous aerators 319 are communicated through the aeration blower and the ozone generator.

[0041] The electrode column group includes a plurality of positive electrode columns 313 and a plurality of negative electrode columns 314. The positive electrode columns 313 and the negative electrode columns 314 are alternately arranged, and both the positive electrode columns 313 and the negative electrode columns 314 are connected to a DC power supply through wires.

[0042] Referring to Figure 2 and Figure 3 , the plurality of photocatalytic reaction columns 312 are evenly distributed. The photocatalytic reaction column 312 includes a cylinder body 315 and a light source 316, a photocatalyst filler 317 and a flushing pipe 318 arranged in the cylinder body 315.

[0043] Specifically, the cylinder body 315 is a cylindrical plexiglass cylinder, which includes an upper accommodating cavity and a lower accommodating cavity that are interconnected. The light source 316 is connected to the top of the upper accommodating cavity and extends along the axis of the cylinder body 315 into the lower accommodating cavity. The light source 316 is preferably an ultraviolet light source and is connected to the storage battery through a wire. A through hole is provided on the side wall of the upper accommodating cavity of the cylinder body 315, and the through hole is coated with a stainless steel filter net. The photocatalyst filler 317 is located in the upper accommodating cavity, and the flushing pipe 318 is located in the lower accommodating cavity.

[0044] The photocatalyst filler 317 is preferably PANI / MoS 2 / MCM-41 coated with sodium alginate.

[0045] The preparation method of PANI / MoS 2 / MCM-41 coated with sodium alginate includes the following steps:

[0046] Step 1: Synthesize mesoporous MCM-41 molecular sieve:

[0047] 1.1. Add 0.5 g of CTAB to 96 mL of deionized water and stir for 3 h.

[0048] 1.2. Add 34 mL of ethanol and 10 mL of 25% ammonia water solution, and mix and stir for 5 min.

[0049] 1.3. Add 2.0 mL of TEOS solution while stirring and continue to stir at room temperature for 3 h.

[0050] 1.4. Filter the solution, wash the solid product three times with deionized water and ethanol, and dry it in an oven at 60 °C for 12 hours and then grind it.

[0051] 1.5. Place the ground product in a tubular furnace and calcine it at 540 °C for 9 h and then grind it thoroughly to obtain mesoporous MCM-41 molecular sieve.

[0052] Step 2: Synthesize MoS2 / MCM-41:

[0053] 2.1. Add 0.024 g of MCM-41 to 70 ml of deionized water and stir for 2 h.

[0054] 2.2. Add 2.47 g of ammonium heptamolybdate and 2.4 g of thiourea, mix and stir for 30 min, and adjust the pH value to 3 with 1 M dilute hydrochloric acid.

[0055] 2.3. Transfer the solution to a 100 ml steel autoclave with a Teflon lining and react at 220 °C for 6 h.

[0056] 2.4. Filter the obtained product, wash it three times with deionized water and ethanol respectively, dry it in an oven at 60 °C for 12 hours, and then grind it thoroughly to obtain MoS2 / MCM-41.

[0057] Step 3. Synthesize PANI / MoS2 / MCM-41:

[0058] 3.1. Add 0.43 g of MoS2 / MCM-41 to 100 ml of 1 M hydrochloric acid solution and stir well for 2 h.

[0059] 3.2. Add 1.86 ml of aniline to the solution and stir in an ice bath for 1 h to prepare solution A.

[0060] 3.3. Add 4.56 g of ammonium persulfate to 100 ml of 1 M hydrochloric acid solution, stir in an ice bath for 1 h, and then prepare solution B.

[0061] 3.4. Quickly add solution B to solution A that is continuously stirred in an ice bath, continue stirring for 20 min, stop stirring, keep the solution in the ice bath for 18 h, filter the obtained solid, wash it three times with deionized water and ethanol respectively, dry it in an oven at 60 °C for 12 hours, and then grind it thoroughly to obtain PANI / MoS2 / MCM-41.

[0062] Step 4. Encapsulate sodium alginate:

[0063] Place 8 g of PANI / MoS2 / MCM-41 and 3 g of sodium alginate in 100 ml of deionized water, stir well for 30 min, drop the obtained solvent into 40 g / L calcium chloride solution drop by drop, let it stand overnight at room temperature, wash it three times with deionized water, and then air dry it to obtain sodium alginate microspheres.

[0064] The reaction chamber 31 and the waste gas chamber 32 are connected by a gas collecting pipe 321. An activated carbon filler 322 is provided inside the waste gas chamber 32, and a waste gas outlet 323 is provided at the top of the waste gas chamber 32.

[0065] A second pH detector (not shown in the figure), a second chemical feeder (not shown in the figure), and a second regulating chamber stirring mixer 331 are provided inside the second regulating chamber 33. A reaction chamber water outlet valve 332 is provided between the second regulating chamber 33 and the reaction chamber 31. A mud-water separation chamber water inlet valve 341 is provided between the second regulating chamber 33 and the mud-water separation chamber 34.

[0066] The mud-water separation chamber 34 is located below the second adjustment chamber 33. A plate-and-frame 342 that can be turned over up and down is provided in the mud-water separation chamber 34, and a filter membrane (not shown in the figure) is laid on the plate-and-frame. A mud-water separation chamber discharge port 341 and a mud-water separation chamber drain port 342 are provided at the bottom of the mud-water separation chamber 34. A discharge valve 343 is provided at the mud-water separation chamber discharge port 341, and a drain valve 344 is provided at the mud-water separation chamber drain port 342. The mud-water separation chamber discharge port 341 is communicated with the underground water source through a groundwater outlet pipe 345.

[0067] The mud-water separation chamber 34 is also arranged on the support plate 11. The support plate 11 is provided with holes for the groundwater outlet pipe 345 to pass through.

[0068] Refer to Figure 1 , the process of the device for treating polluted groundwater and soil in the embodiment of the present application is as follows:

[0069] 1. The soil to be treated enters the coarse sieve chamber 24 through the feed port 211 to sieve the soil. Large-particle soil blocks or sundries that cannot pass through the coarse sieve mesh 22 are discharged from the coarse sieve sundries discharge port 243.

[0070] 2. The soil enters the crushing chamber 25, and the two crushing rollers 251 rotate towards each other to crush the soil in the crushing chamber 3.

[0071] 3. The crushed soil enters the fine sieve chamber 26 to fine-sieve the soil. Soil blocks or sundries that cannot pass through the fine sieve are discharged from the fine sieve sundries discharge port 263.

[0072] 4. The groundwater to be treated in the groundwater well is pumped into the first adjustment chamber 27 through the groundwater inlet pipe 28 by the turbidity flow pump 29 and mixed with the polluted soil at a ratio of 3:1 to 5:1. Part of the pollutants enter the water from the soil, and the pH value of the mud-water mixture is adjusted according to the main pollutants.

[0073] 5. The mud-water mixture enters the reaction chamber 31, and the microporous aerator 319 performs intermittent aeration. The electrode column group is energized to electrolyze the mud-water mixture, and the pollutants are further desorbed from the soil into the water under the action of aeration and current. When the solution is acidic, ozone directly oxidizes the organic matter. When the solution is alkaline, ozone generates hydroxyl radicals in the water and reacts with the organic matter. The photocatalyst filler 317 in the photocatalytic reaction column 312 adsorbs a large amount of pollutants in the mud-water mixture and degrades the pollutants under the irradiation of the light source 316. During the intermittent period of aeration, larger particles of mud will gradually settle to form a mud-water separation state. At this time, the light transmittance of the mud-water mixture increases, and the photocatalytic reaction efficiency improves. During the whole treatment process, the flushing pipe 318 intermittently flushes the photocatalyst filler 317.

[0074] 6. The gas generated in the reaction chamber 31 enters the exhaust gas chamber 32 and is adsorbed and purified by the activated carbon filler 322.

[0075] 7. After the repair is completed, the muddy water mixture enters the second regulation chamber 33, where the pH value is adjusted to neutral, and then enters the muddy water separation chamber 34. Under the action of gravity, the muddy water is separated. At this time, the discharge valve 343 is closed and the drain valve 344 is opened. The liquid is first discharged into the ground through the groundwater outlet pipe 345. After the drainage is completed, the discharge valve 343 is opened and the drain valve 345 is closed. Then the plate frame 342 is turned over, and the mud is discharged through the discharge port 341 of the muddy water separation chamber.

[0076] This is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An apparatus for treating contaminated groundwater and soil, characterized in that, it includes a soil pretreatment and conditioning system and a pollutant treatment system; The soil pretreatment and conditioning system includes a feed inlet, a groundwater inlet and a mixed liquid outlet; the feed inlet is used for feeding contaminated soil, the groundwater inlet is connected to the contaminated groundwater source; the mixed liquid outlet is connected to the pollutant treatment system; The pollutant treatment system includes a reaction chamber; the reaction chamber includes an exhaust port and a liquid discharge port; the exhaust port is connected to an exhaust gas chamber; the liquid discharge port is sequentially connected to a second conditioning chamber and a mud-water separation chamber; a microporous aerator, an electrode column group and a photocatalytic reaction column are provided in the reaction chamber; The photocatalytic reaction column includes a cylinder body and a light source, a photocatalyst filler and a flushing pipe arranged in the cylinder body; the cylinder body includes an upper accommodating cavity and a lower accommodating cavity which are communicated with each other; the light source is connected to the top of the upper accommodating cavity and extends along the axis of the cylinder body to the lower accommodating cavity; through holes are provided on the side wall of the upper accommodating cavity; the photocatalyst filler is located in the upper accommodating cavity; the flushing pipe is located in the lower accommodating cavity; The photocatalyst filler is PANI / MoS 2 / MCM-41 coated with sodium alginate.

2. The apparatus for treating contaminated groundwater and soil according to claim 1, characterized in that, The preparation method of the photocatalyst filler includes the following steps: Step 1, synthesize mesoporous MCM-41 molecular sieve: 1.

1. Add 0.5 g of CTAB to 96 mL of deionized water and stir for 3 h; 1.

2. Add 34 mL of ethanol and 10 mL of 25% ammonia water solution, mix and stir for 5 min; 1.

3. Add 2.0 mL of TEOS solution while stirring and continue to stir at room temperature for 3 h; 1.

4. Filter the solution, wash the solid product three times with deionized water and ethanol, and dry it in an oven at 60 °C for 12 hours and then grind it; 1.

5. Place the ground product in a tubular furnace and calcine it at 540 °C for 9 h and then grind it thoroughly to obtain mesoporous MCM-41 molecular sieve; Step 2, synthesize MoS2 / MCM-41: 2.

1. Add 0.024 g of MCM-41 to 70 ml of deionized water and stir for 2 h; 2.

2. Add 2.47 g of ammonium heptamolybdate and 2.4 g of thiourea, mix and stir for 30 min, and adjust the pH value to 3 with 1 M dilute hydrochloric acid; 2.

3. Transfer the solution to a 100 ml steel autoclave lined with Teflon and react at 220 °C for 6 h; 2.

4. Filter the obtained product, wash it three times with deionized water and ethanol respectively, dry it in an oven at 60 °C for 12 hours, and then grind it thoroughly to obtain MoS2 / MCM-41; Step 3, synthesize PANI / MoS2 / MCM-41: 3.

1. Add 0.43 g of MoS2 / MCM-41 to 100 ml of 1 M hydrochloric acid solution and stir thoroughly for 2 h; 3.

2. Add 1.86 ml of aniline to the solution, stir in an ice bath for 1 h to make solution A; 3.

3. Add 4.56 g of ammonium persulfate to 100 ml of 1 M hydrochloric acid solution, stir in an ice bath for 1 h and then make solution B; 3.

4. Quickly add solution B to solution A under continuous ice bath stirring, continue stirring for 20 min, stop stirring, ice bath the solution for 18 h, filter the obtained solid, wash it three times with deionized water and ethanol respectively, dry it in an oven at 60 °C for 12 hours, and then grind it thoroughly to obtain PANI / MoS2 / MCM-41; Step 4. Encapsulate sodium alginate: Place 8 g of PANI / MoS2 / MCM-41 and 3 g of sodium alginate in 100 ml of deionized water, stir well for 30 min, drop the obtained solvent into a 40 g / L calcium chloride solution drop by drop, let it stand overnight at room temperature, wash it three times with deionized water and then air dry to obtain sodium alginate microspheres.

3. The device for treating contaminated groundwater and soil according to claim 1, characterized in that the material of the cylinder is plexiglass; the light source is an ultraviolet light source.

4. The device for treating contaminated groundwater and soil according to claim 1, characterized in that the through hole is coated with a stainless steel filter mesh.

5. The device for treating contaminated groundwater and soil according to claim 1, characterized in that the mud-water separation chamber is located below the second adjustment chamber, and a plate-and-frame that can be turned over up and down is provided in the mud-water separation chamber, and a filter membrane is laid on the plate-and-frame.

6. The device for treating contaminated groundwater and soil according to claim 1, characterized in that the soil pretreatment and adjustment system includes a housing and a coarse screen, a crushing roll group and a fine screen that are sequentially arranged in the housing from top to bottom; the coarse screen, the crushing roll group and the fine screen divide the inner cavity of the housing into a coarse screen chamber, a crushing chamber, a fine screen chamber and a first adjustment chamber; the feed inlet is located at the top of the coarse screen chamber, and the groundwater inlet and the mixed liquid outlet are both located on the side wall of the first adjustment chamber.

7. The device for treating contaminated groundwater and soil according to claim 6, characterized in that a first pH detector, a first chemical feeder and a first adjustment chamber stirring mixer are provided inside the first adjustment chamber; a second pH detector, a second chemical feeder and a second adjustment chamber stirring mixer are provided inside the second adjustment chamber.

8. The device for treating contaminated groundwater and soil according to claim 6, characterized in that the first adjustment chamber and the adjustment chamber are respectively located on both sides of the reaction chamber, and a reaction chamber water inlet valve is provided between the reaction chamber and the first adjustment chamber; a reaction chamber water outlet valve is provided between the reaction chamber and the second adjustment chamber.

Images