Manganese removal permeable reactive barrier device

Abstract

The utility model provides a manganese removal permeable reactive barrier device which is arranged at an ore hole opening and used for intercepting pollutants in a reactive barrier body. The reaction wall device comprises a water guide door, a barrier wall, a plurality of sandstone transition areas and a plurality of reaction areas which are sequentially arranged in the direction of the underground water force gradient, and the sandstone transition areas and the reaction areas are sequentially, alternately and continuously arranged; each reaction area is provided with a reaction groove, a reaction turnover box is arranged in each reaction groove, and the reaction turnover boxes are filled with reaction adsorption materials in a replaceable mode and used for oxidizing dissolved-state divalent manganese in underground water into high-valence-state manganese oxide so as to reduce pollution mobility; the barrier efficiency of the reaction wall can be improved, and the repair cost can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of pollutant treatment device, especially to a permeable reaction wall device of manganese removal. BACKGROUND

[0002] Manganese ore is mined for a long time, which causes the mining pollution to be continuously intensified, and manganese is dissolved under the action of acid leaching agent, continuously migrates and transforms through rainwater leaching and penetration, causes the groundwater acidification and manganese pollution to be seriously overproof, and brings a series of ecological environment problems.

[0003] There are several main methods for removing manganese, including ion exchange, oxidation filtration, adsorption and membrane filtration, and these methods have low removal efficiency and high operation and maintenance cost when removing manganese and ammonia nitrogen at the same time.

[0004] The traditional chemical oxidation / adsorption blocking technology of manganese-containing mine gushing water has problems of poor blocking effect and short service life. The biological method is a commonly used manganese pollution environment remediation method, which has the advantages of small environmental disturbance and no secondary pollution. However, the removal of manganese in the biological system is mainly attributed to the contribution of manganese-oxidizing bacteria (MnOB), and the biological oxidation rate of Mn (II) is several orders of magnitude faster than the non-biological approach. The reported manganese-oxidizing bacteria include marine bacillus species capable of oxidizing Mn (II), freshwater-derived bacillus species (SS-1 and SP-6), and the most widely studied pseudomonas species (MnB1 and GB-1). These strains usually remove manganese by microbial oxidation, and these strains have not been applied to the actual manganese-contaminated water treatment. The main reason is that the biological method needs to continuously add carbon source to maintain the growth of microorganisms during actual use, which increases the operation cost of the process.

[0005] Therefore, there is an urgent need for a permeable reaction wall device for manganese removal that can improve the blocking efficiency of the reaction wall and reduce the remediation cost. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a permeable reaction wall device for manganese removal, which aims to solve the technical problems of low blocking efficiency and high remediation cost of traditional manganese removal methods.

[0007] To achieve the above-mentioned purpose, the utility model provides a permeable reaction wall device for manganese removal, which is arranged at the mine entrance and used for intercepting pollutants inside the reaction wall body. The reaction wall device comprises a water guide door, a blocking wall, a plurality of sandstone transition zones and a plurality of reaction zones arranged in the direction of groundwater hydraulic gradient in sequence, and the plurality of sandstone transition zones and the plurality of reaction zones are arranged in sequence and alternately.

[0008] Each of the reaction zones is provided with a reaction groove, and a reaction turnover box is arranged in the reaction groove, and the reaction turnover box is filled with replaceable reaction adsorption material, which is used to oxidize dissolved divalent manganese in groundwater to high-valence manganese to reduce the pollution migration.

[0009] As a further improvement of the above-mentioned scheme, the manganese-removing permeable reactive wall device further comprises a water-blocking structure, and the water-blocking structure comprises a U-shaped impermeable wall and an impermeable cover,

[0010] The U-shaped impermeable wall and the impermeable cover are both made of HDPE film.

[0011] The HDPE film is arranged on the left and right sides and the bottom of the manganese-removing permeable reactive wall device to form the U-shaped impermeable wall.

[0012] The HDPE film cover is arranged on the top of the manganese-removing permeable reactive wall device to form the impermeable cover.

[0013] As a further improvement of the above-mentioned scheme, the reaction turnover box comprises a wire mesh cage and a water-permeable geotextile arranged on the inner wall of the wire mesh cage, and the water-permeable geotextile is used to wrap the reaction adsorption material.

[0014] As a further improvement of the above-mentioned scheme, the wire mesh cage is welded into a hole-shaped grid by wire mesh, and preferably, the hole spacing is 1 cm.

[0015] As a further improvement of the above-mentioned scheme, the reaction adsorption material comprises modified straw, hydroxyapatite, and ceramsite, and microorganisms, and the reaction adsorption material is formed by mixing the above-mentioned components in a predetermined proportion.

[0016] As a further improvement of the above-mentioned scheme, the microorganisms are manganese-oxidizing bacteria.

[0017] As a further improvement of the above-mentioned scheme, the modified straw is obtained by pickling straw; preferably, the ceramsite is a spherical rough particle with a particle size of 4-6 mm; and preferably, the particle size of the hydroxyapatite is 4.5 microns.

[0018] As a further improvement of the above-mentioned scheme, the water guide door is arranged in a trumpet shape to converge the manganese-containing pollution plume.

[0019] As a further improvement of the above-mentioned scheme, each of the sand and gravel transition zones is provided with an injection well, the injection well is vertically inserted into the sand and gravel transition zone, and the top end of the injection well is exposed outside the sand and gravel transition zone; a plurality of through holes are arranged in the area close to the bottom of the injection well, and the bottom of the through holes is lower than the lowest water level of the arrangement area. The through holes are used to take water from the inside for detecting the concentration of heavy metals in groundwater.

[0020] As a further improvement of the above-mentioned scheme, the sand and gravel transition zone is filled with water permeable material, preferably, the water permeable material is sand and gravel with a particle size of 1-2cm.

[0021] Due to the above technical scheme, the application has the following beneficial effects:

[0022] The device for removing manganese permeable reaction wall provided by the utility model, adopts the assembled structure, and is simple to construct, only needs to set the water guide door at the mine entrance, and dig out the corresponding area to fill the corresponding water permeable material and reaction turnover box in the corresponding area, and the reaction adsorption material in the reaction turnover box is replaceable, only needs to replace the reaction adsorption material in the reaction turnover box in the subsequent maintenance work, can reduce the construction cost and the subsequent repair and replacement material cost of the device for removing manganese permeable reaction wall, and in the utility model, the dissolved bivalent manganese in the underground water is oxidized into high-valence insoluble manganese oxide by the reaction adsorption material, greatly reduces the migratable content of manganese in the underground water, and improves the barrier efficiency of the reaction wall, in some preferred embodiments, the reaction adsorption material comprises modified straw, hydroxyapatite and ceramsite, and microorganisms, the modified straw is obtained by pickling straw, and the microorganisms are manganese oxidizing bacteria, the modified straw is used as the colonization carrier of manganese oxidizing bacteria, at the same time, provides the carbon source for the microorganisms, enhances the activity of the microorganisms and the anti-interference ability of the microorganisms to other substances in the underground water, and ensures that the manganese oxidizing bacteria can oxidize the low-valence dissolved manganese into high-valence insoluble manganese oxide. BRIEF DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained from the structure shown in the drawings without creative labor.

[0024] Fig. 1 The utility model discloses a device for removing manganese permeable reaction wall schematic view of main view;

[0025] Fig. 2The utility model discloses a side view schematic drawing of permeable reaction wall device of manganese removal.

[0026] Fig. 3 The utility model discloses a three-dimensional schematic diagram of reaction turnover box.

[0027] Reference Signs:

[0028] 1, water guide door;2, barrier wall;3, gravel transition zone;31, water permeable material;4, reaction zone;5, reaction turnover box;51, wire cage;52, water permeable geotextile;6, injection well.

[0029] The utility model discloses the realization, functional characteristics and advantages will combine the embodiment, and make further explanation with reference to the drawings. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0031] It should be noted that all directional indications (such as up, down, etc.) in the embodiments of the utility model are only used to explain the relative position relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications will also change accordingly.

[0032] In addition, the description of "first", "second" and the like in the utility model is only for the purpose of description, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features.

[0033] Moreover, the technical solutions of the various embodiments of the utility model can be combined with each other, but must be based on the realization of the ordinary skill in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the utility model.

[0034] Reference Figs. 1-3The utility model provides a kind of permeable reaction wall device of manganese removal, the reaction wall device is located in mine entrance, for stopping pollutant in reaction wall body inside;The reaction wall device includes water guide door 1, barrier wall 2, several gravel transition zones 3 and several reaction zones 4 in turn along the direction of groundwater hydraulic gradient, and several gravel transition zones 3 and several reaction zones 4 are sequentially and alternately continuously arranged;

[0035] Each reaction zone 4 is provided with reaction groove, reaction turnover box 5 is arranged in the reaction groove, reaction adsorption material is filled in reaction turnover box 5, and dissolved bivalent manganese in groundwater is oxidized to high-valence state oxidized manganese to reduce pollution migration for being replaced;

[0036] Specifically, the permeable reaction wall device of manganese removal provided by the utility model is arranged at the mine entrance, perpendicular to the direction of groundwater flow line, and can capture the entire pollution source;Preferably, the mine entrance has a certain slope position, and the manganese-containing pollution plume runoff discharged from the mine passes through water guide door 1 to converge, enters barrier wall 2, realizes device operation by using hydraulic gradient, uniformly distributes water through gravel transition zone 3 to enter reaction zone 4, sequentially and alternately flows through multiple gravel transition zones 3 and multiple reaction turnover boxes 5, and efficiently adsorbs and removes groundwater manganese;In the embodiment, the total length of the reaction wall is 3.5 m, the width is 1.5 m, the depth is 0.5 m, the width of reaction zone 4 is 0.3 m, the width of gravel transition zone 3 is 0.2 m, a total of six reaction zones 4 and seven gravel transition zones 3 are provided, reaction turnover box 5 is arranged in each reaction zone 4, the size of reaction turnover box 5 is 1.5 m×0.3 m×0.5 m;Permeable material 31 is arranged in each gravel transition zone 3, preferably, the particle size of permeable material 31 is 1-2 cm of sand and pebble;

[0037] The manganese removal permeable reaction wall device adopts an assembled structure, construction is simple, only a water guide door 1 needs to be arranged at a mine entrance, and corresponding permeable materials and reaction turnover boxes 5 are arranged in the corresponding area, and the reaction and adsorption materials in the reaction turnover boxes 5 can be replaced, in subsequent maintenance work, only the reaction and adsorption materials in the reaction turnover boxes 5 need to be replaced, so that the construction cost of the manganese removal permeable reaction wall device and the subsequent repair and replacement material cost can be reduced; in addition, in the manganese removal permeable reaction wall device, the dissolved bivalent manganese in underground water is oxidized into high-valence insoluble manganese oxide by the reaction and adsorption materials, so that the content of the migratory state of manganese in underground water is greatly reduced, and the barrier efficiency of the reaction wall is improved; in some preferred embodiments, the reaction and adsorption materials include modified straw, hydroxyapatite and ceramsite, and microorganisms, the modified straw is obtained by pickling straw, and the microorganisms are manganese-oxidizing bacteria; the modified straw is used as a colonization carrier of manganese-oxidizing bacteria, and at the same time, the modified straw provides a carbon source for the microorganisms, enhances the activity of the microorganisms and the anti-interference ability of the microorganisms to other substances in underground water, and ensures that the manganese-oxidizing bacteria can oxidize low-valence dissolved manganese into high-valence insoluble manganese oxide.

[0038] As a preferred embodiment, the manganese removal permeable reaction wall device further comprises a water isolation structure, the water isolation structure comprises a U-shaped impermeable wall and an impermeable cover,

[0039] The U-shaped impermeable wall and the impermeable cover are both made of HDPE film;

[0040] The HDPE film is arranged on the left and right sides and the bottom of the manganese removal permeable reaction wall device to form the U-shaped impermeable wall; in this embodiment, 1mm-thick HDPE film is arranged on the bottom and the two sides of the reaction wall body;

[0041] The HDPE film cover is arranged on the top of the manganese removal permeable reaction wall device to form the impermeable cover, and the arrangement of the water isolation structure can prevent surface rainwater from infiltrating and avoid affecting the repair effect of the reaction material and interfering with the evaluation of the permeable reaction wall effect.

[0042] As a preferred embodiment, referring to Fig. 3 The reaction turnover box 5 comprises a wire mesh cage 51 and a permeable geotextile 52 arranged on the inner wall of the wire mesh cage 51, and the permeable geotextile 52 is used for wrapping the reaction and adsorption materials;

[0043] The wire mesh cage 51 is welded into a hole-shaped grid by a wire mesh, and preferably, the hole spacing is 1cm;

[0044] In order to prevent water flow loss, the reaction adsorption material is wrapped with the water permeable geotextile 52 on the ground, sealed, and then hoisted and placed in the wall one by one through the hoisting equipment on the ground, and the whole loading of the filler is completed. In the subsequent replacement process, only the reaction adsorption material wrapped with the water permeable geotextile 52 needs to be replaced, which is convenient to operate.

[0045] As a preferred embodiment, the modified straw, hydroxyapatite and ceramsite, and microorganisms are mixed in a predetermined ratio to form the reaction adsorption material; preferably, the mass ratio of modified straw: hydroxyapatite: ceramsite is 50%:33%:17%; the mass of modified straw: hydroxyapatite: ceramsite is 67.5 kg, 45 kg and 22.5 kg respectively.

[0046] Specifically, the straw is acid washed (1 mol / L HCl) to obtain modified straw. The acid washing of the modified straw improves the colonization ability of the straw to microorganisms. Since the straw contains biologically available carbon components and organic matter, the microorganisms enriched on the surface of the modified straw can maintain metabolism with the help of the carbon source, without the need for additional carbon source.

[0047] The ceramsite is a spherical rough particle with a particle size of 4-6 mm, which regulates the permeability coefficient of the filler and serves as a microbial colonizer to form a biofilm on the surface to promote manganese oxidation removal.

[0048] The hydroxyapatite has a particle size of 4.5 microns, which removes manganese through ion exchange and surface complexation, and adjusts the acidity and alkalinity of the influent;

[0049] After the modified straw, hydroxyapatite and ceramsite are mixed in a predetermined ratio, the microorganisms are finally added, and the overall permeability coefficient is greater than 10 -6 m / s, and not less than twice the permeability coefficient of the local undisturbed soil, to prevent groundwater from flowing around;

[0050] The microorganism is a manganese-oxidizing bacterium, which is cultured in the laboratory by amplification. The manganese-oxidizing bacterium is obtained by screening and separation from a local manganese-polluted site in a mining area. The inoculation amount of the manganese-oxidizing bacterium in the reaction turnover box 5 is 0.05wt%;

[0051] The manganese-oxidizing bacterium, modified straw, hydroxyapatite and ceramsite are filled in the reaction turnover box 5 as a reaction medium. Specifically, the manganese-oxidizing bacterium is expanded and cultured to form a biological inoculant, and then mixed with the remaining fillers for filling.

[0052] The expansion culture of the manganese-oxidizing bacterium includes adding the manganese-oxidizing bacterium to a LB culture medium and a trace element solution, and expanding the culture at 20-30℃ for 24h.

[0053] The chemical components of the microelements are MnSO4·7H2O 0.1 g / L, ZnCl2 0.07 g / L, NiCl2·4H2O 0.024 g / L, Na2MoO4·2H2O 0.024 g / L, MnCl2·4H2O 0.006 g / L, CuCl2·2H2O 0.002 g / L, FeCl2·4H2O 1.5 g / L, and CoCl2·6H2O 0.19 g / L.

[0054] As a preferred embodiment, the water guide door 1 is arranged in a trumpet shape so as to converge the manganese-containing pollution plume.

[0055] As a preferred embodiment, an injection well 6 is arranged in each of the sandstone transition zones 3, the injection well 6 is vertically inserted in the sandstone transition zone 3, and the top end of the injection well 6 is exposed to the sandstone transition zone 3, in this embodiment, the top end of the injection well 6 is exposed to the top 5 cm of the sandstone transition zone 3; a plurality of through holes are arranged in the area close to the bottom of the injection well 6, and the bottoms of the through holes are lower than the lowest water level of the arrangement area; in this embodiment, the injection well 6 is made of a PVC pipe, and a plurality of through holes are arranged in the lower part of the PVC pipe so as to take water in the inner cavity of the injection well 6 to detect the heavy metal concentration in the underground water.

[0056] Through test tests, the removal rate of manganese in the water body is greater than 90% after the initial concentration of Mn(II) is 200 mg / L and the manganese-removing permeable reaction wall device is processed, which indicates that the manganese-removing permeable reaction wall device can effectively remove Mn(II) in the actual underground water, and achieves the purpose of water purification.

[0057] The above is only the preferred embodiment of the utility model, and does not limit the patent range of the utility model, and any equivalent structural transformation, direct / indirect application in other related technical fields under the utility model concept of the utility model, and the contents of the utility model specification and drawings are included in the patent protection range of the utility model.

Claims

1. A permeable reactive barrier device for manganese removal, said reactive barrier device is installed at the mouth of a mine pit for the purpose of trapping contaminants inside the reactive barrier body; characterized in that, The reaction wall device comprises a water guide door, a barrier wall, a plurality of sandstone transition zones and a plurality of reaction zones arranged in sequence along the direction of the groundwater hydraulic gradient, and the plurality of sandstone transition zones and the plurality of reaction zones are arranged in sequence and alternately. Each reaction zone is provided with a reaction groove, and a reaction turnover box is arranged in the reaction groove.

2. A permeable reactive barrier for removing manganese according to claim 1, wherein The reaction turnover box is filled with replaceable reaction adsorption material, which is used to oxidize dissolved divalent manganese in groundwater into high-valence manganese oxide to reduce the migration of pollution. The manganese-removing permeable reaction wall device further comprises a water-proof structure, and the water-proof structure comprises a U-shaped impermeable wall and an impermeable cover. The U-shaped impermeable wall and the impermeable cover are both made of HDPE film. The HDPE film is arranged on the left and right sides and the bottom of the manganese-removing permeable reaction wall device to form the U-shaped impermeable wall.

3. A permeable reactive barrier device for removing manganese according to claim 1 or 2, characterized in that The HDPE film cover is arranged on the top of the manganese-removing permeable reaction wall device to form the impermeable cover.

4. A permeable reactive barrier for removing manganese according to claim 3, wherein The reaction turnover box comprises a wire mesh cage and a water-permeable geotextile arranged on the inner wall of the wire mesh cage.

5. A permeable reactive barrier for removing manganese according to claim 1 or 2, wherein The wire mesh cage is welded from wire mesh to form a hole-shaped grid.

6. A permeable reactive barrier for removing manganese according to claim 1 or 2, wherein The water guide door is arranged in a bell mouth shape to converge the pollution plume containing manganese.

7. A permeable reactive barrier for removing manganese according to claim 1 or 2, wherein Each sandstone transition zone is provided with an injection well, which is vertically inserted into the sandstone transition zone, and the top end of the injection well is exposed to the sandstone transition zone. The area close to the bottom of the injection well is provided with a plurality of through holes communicating with the inner cavity of the injection well. The sandstone transition zone is filled with water-permeable material, and the water-permeable material is sand and pebbles with a particle size of 1-2 cm.

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