Isolation belt device for blocking and treating acid mine wastewater and method thereof

Abstract

The invention discloses an isolation belt device for blocking and treating acid mine wastewater and a method thereof, and belongs to the technical field of mine wastewater isolation. The device comprises a buoy, an isolation belt fixing frame is arranged at the bottom of the buoy, a weight settling box is arranged at the bottom of the isolation belt fixing frame, and the weight settling box is filled with filler; biomass filler is arranged in the isolation belt fixing frame, and three-dimensional elastic brush filler is arranged on the front side and the rear side of the isolation belt fixing frame in a binding mode. The device is simple in structure, can be effectively assembled according to field conditions, can touch the bottom, can perform multi-depth treatment, can effectively reduce the concentration of dissolved oxygen converged into AMD, gradually improve the bottom environment, promote the growth of anaerobic microorganisms, perform biofilm formation synergistic treatment by using indigenous microorganisms, avoid the problem of adaptability of exogenous microbial agents, and can be effective for a long time; the cost and the risk of additionally adding nutrient sources and microorganisms are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of mine wastewater isolation, and more specifically, to an isolation belt device and a method for isolating and treating acid mine wastewater. Background Art

[0002] With the rapid development of science and technology, the country's demand for mineral resources is increasing, which will form mine pits / mine caves and produce a large amount of abandoned ores. The sulfide minerals in them will form acid mine drainage (AMD) under chemical and microbial oxidation, and fill these mine pits with runoff, thus forming AMD reservoirs with low pH and multiple heavy metal complex pollution. Obviously, AMD reservoirs have large reserves, high environmental risks, and great difficulty in governance. Once the AMD reservoir overflows or the cracks flow outward, it will cause serious harm to the surrounding environment and ecosystem, and there is a great environmental risk. The current source control technology is mainly focused on pollution control of the source waste rock dump; and the governance of AMD reservoirs, mainly in acid neutralization, heavy metal adsorption fixation and extraction. At the same time, the summer rainfall reaches, causing a large amount of rainwater to accumulate in the cracks of the dump, and continuously flow into the AMD reservoir. At present, there are few blocking technologies for the path of acid mine drainage in reservoirs. At the same time, the cracks where the acid water from the dump enters the reservoir are difficult to explore and cannot be completely blocked. Therefore, the research and development strategy should focus on the isolation and control of fresh AMD input points in AMD reservoirs. The focus is not on reducing the amount of AMD inflow, but on isolating heavy metals in AMD and reducing their concentrations. This approach can assist the restoration work inside the reservoir and reduce the impact of acidification and metal toxicity.

[0003] There is no isolation zone for AMD treatment in the current existing technology. The only equipment technology similar to this aspect is the ecological floating bed. The ecological floating bed is one of the more common devices in the field of water body remediation and purification and is widely used. The current mainstream floating bed structure includes a floating bed skeleton, floating blocks, a plant planting area, a filler area, a fixed rope and plants. By filling fillers in independent containers and planting plants on top, the floating bed skeleton provides overall structural support, and the floating blocks provide buoyancy to control the overall sinking depth. Water enters through the through holes at the bottom of the container, and after preliminary treatment with the filler, it reaches the tolerance range of the plants, and the water purification function is achieved through plant metabolic enrichment. However, this method of treating AMD wastewater is difficult to penetrate deep into the bottom of the acid reservoir and can only be effective in shallow waters; therefore, it is difficult for the ecological floating beds on the market to achieve all-round AMD treatment, it is difficult to improve the anaerobic environment of the bottom water layer, and it is difficult to achieve the effect of AMD barrier treatment;

[0004] In the patent "CN216273346U-An ecological floating bed for treating acidic heavy metal wastewater", the device includes a floating bed structure module and a floating bed plant working module, a bacteria working module and an algae working module arranged in the floating bed structure module: This invention has the following major problems:

[0005] The device is difficult to reach the bottom and has limited treatment effect; the newly introduced acid water contains a certain dissolved oxygen concentration, which increases the dissolved oxygen concentration of the bottom water, inhibits the metabolism of anaerobic bacteria, and easily oxidizes ferrous iron to produce acidity; these aspects are beyond the reach of these patents; AMD's extremely acidic and oligotrophic environment makes it difficult for plants to grow; the oligotrophic environment and the water exchange characteristics of the floating bed make it difficult to ensure sufficient nutrition inside the floating bed and promote the growth of microorganisms.

[0006] Due to the difficulty in managing AMD reservoirs and the continuous inflow of AMD, a large amount of wastewater treatment costs are generated, and there are serious environmental risks. Therefore, equipment and technology that can effectively alleviate the acidity and metal concentration of AMD inflow water are urgently needed. Aiming at the needs of AMD reservoir management, the present invention designs an AMD in-situ barrier device that can reduce the acidity, metal concentration and dissolved oxygen of the incoming AMD. Summary of the invention

[0007] 1. Technical problem to be solved by the invention

[0008] In view of the defects and shortcomings of the prior art, the present invention provides an isolation zone device and method for isolating and treating acid mine drainage. The present invention has a simple structure, can be effectively assembled according to the on-site conditions, and can penetrate deep into the bottom for multi-depth treatment. Biomass filler is mainly used as the main isolation material, which can effectively reduce the dissolved oxygen concentration of the AMD, gradually optimize the bottom environment, and promote the reproduction of anaerobic microorganisms. Indigenous microorganisms are used for biofilm enhancement treatment to reduce the inadaptability of additional added bacterial agents, which can be effective for a long time and reduce the cost and risk of additional added nutrient sources and microorganisms.

[0009] 2. Technical solution

[0010] In order to achieve the above object, the technical solution provided by the present invention is:

[0011] The present invention discloses an isolation belt device for isolating and treating acid mine wastewater, comprising a plurality of isolation units, each of which is provided with a buoy, an isolation belt fixing frame is provided at the bottom of the buoy, a sinking weight box is provided at the bottom of the isolation belt fixing frame, and the sinking weight box is filled with filler;

[0012] The isolation belt fixing frame is provided with biomass fillers, and the front and rear sides of the isolation belt fixing frame are bound with three-dimensional elastic brush fillers.

[0013] Furthermore, the isolation belt fixed frame is evenly distributed with connecting holes around it, the float is fixedly connected to the connecting hole at the top of the isolation belt fixed frame through a thick steel wire, and the sinking weight box is fixedly connected to the connecting hole at the bottom of the isolation belt fixed frame through a thick steel wire.

[0014] Furthermore, water holes are evenly opened on the surface of the sinking weight box, and the diameter of the water holes is 2 cm.

[0015] Furthermore, multiple groups of isolation units are interconnected to form an integrated isolation belt device, and multiple groups of isolation belt fixed frames are arranged in parallel along the width direction. A buoy is provided at the upper end of each group of isolation belt fixed frames, and a sinking weight box is provided at the lower end of each group of isolation belt fixed frames.

[0016] Furthermore, the sides of the isolation belt fixing frames are provided with connection through holes at intervals, and two adjacent groups of isolation belt fixing frames are connected to each other by thick steel wires passing through the connection through holes.

[0017] Furthermore, the outer length of the isolation belt fixing frame is 4.0m, the width is 1.5m, the thickness is 2cm, the length of the three-dimensional elastic brush filler is 3.8m, and the interval between two adjacent groups of three-dimensional elastic brush fillers is 30cm.

[0018] Furthermore, the filler is porous ceramsite, activated carbon particles, and biogas residue, and the mixing ratio is 1:1:3. The diameter of the porous ceramsite and activated carbon particles is 3 cm.

[0019] Furthermore, a plurality of unit frames are provided in the isolation belt fixing frame, and biomass filler is filled in each unit frame. The biomass filler is 1m wide, 1.5m long, and 2cm thick, and is curtain-shaped. The biomass filler is fixed to the connecting through hole on the side of the isolation belt fixing frame by a thick steel wire.

[0020] A method for isolating and treating acid mine wastewater with an isolation belt device:

[0021] According to the depth of 1-2m from the edge of the reservoir or lake, the length of the fixed frame of the isolation belt is selected, and the biomass filler is filled in the fixed frame of the isolation belt; the outer layer of the fixed frame of the isolation belt is bundled with three-dimensional elastic brush filler at intervals of 30cm;

[0022] The bottom of the isolation belt fixed frame is connected to the sinking weight box with thick steel wire. The sinking weight box is filled with porous ceramsite, activated carbon particles and biogas residue in a mixing ratio of 1:1:3 and mixed thoroughly.

[0023] Adjacent isolation belt fixed frames are connected by thick steel wires through connecting through holes, and the bottom sinking weight boxes are connected in pairs; the buoys are connected to the top of the isolation belt fixed frames by thick steel wires, and sink vertically into the water after the overall connection is completed;

[0024] The bottom sinking weight box touches the bottom of the riverbed, and the buoy ensures that the isolation zone fixed frame is perpendicular to the water surface or inclined at a small angle of 0-10 degrees.

[0025] Furthermore, the isolation belt device has its own weight and can be placed by a crane. After placement, check the condition of the biomass filler every six months. If there is no crushing or other phenomena, there is no need to replace or maintain it.

[0026] Furthermore, a plurality of unit frames are provided in the isolation belt fixing frame, and biomass filler is filled in each unit frame. The biomass filler is 1m wide, 1.5m long and 2cm thick. The biomass filler is fixed to the connecting through hole on the side of the isolation belt fixing frame by thick steel wire.

[0027] A method for isolating and treating acid mine wastewater with an isolation belt device:

[0028] According to the depth of 1-2m from the edge of the reservoir or lake, the length of the fixed frame of the isolation belt is selected, and the biomass filler is filled in the fixed frame of the isolation belt; the outer layer of the fixed frame of the isolation belt is bundled with three-dimensional elastic brush filler at intervals of 30cm;

[0029] The bottom of the isolation belt fixed frame is connected to the sinking weight box with thick steel wire. The sinking weight box is filled with porous ceramsite, activated carbon particles and biogas residue in a mixing ratio of 1:1:3 and mixed thoroughly.

[0030] Two adjacent groups of isolation belt fixed frames are connected by thick steel wires through connecting through holes, and the bottom sinking weight boxes are also connected in pairs; the buoys are connected to the top of the isolation belt fixed frames by thick steel wires, and sink vertically into the water after the overall connection is completed;

[0031] The bottom sinking weight box touches the bottom of the riverbed, and the buoy ensures that the isolation zone fixing frame is perpendicular to the water surface or inclined at a small angle.

[0032] Furthermore, the isolation belt device has a certain weight and can be placed using a crane. After placement, the condition of the biomass filler can be checked every six months. If the biomass is not crushed, etc., no replacement or maintenance is required.

[0033] 3. Beneficial effects

[0034] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects:

[0035] The present invention uses biomass filler as the main isolation material, and a lightweight and high-strength metal material is used as the isolation belt fixing frame on the outside. The inside is filled with hanging biomass filler, and a hollow sinker weight box with multiple holes is used at the bottom. The inside is filled with activated carbon, porous expanded clay, and sludge. The sinker weight box is fixed to the bottom of the isolation belt fixing frame, and the top of the isolation belt fixing frame is connected to a buoy, and a three-dimensional elastic brush filler is vertically fixed on the side, so that the whole is vertically fixed to the edge of the reservoir. Due to the changeable shape of the reservoir coast, multiple such devices can be used in combination to form a barrier belt.

[0036] The present invention has a simple structure and can be effectively assembled according to the on-site conditions. It can better meet the needs of on-site implementation, and the device can reach the bottom and process at multiple depths. It can reduce the dissolved oxygen concentration entering the AMD, gradually improve the bottom environment, promote the growth of anaerobic microorganisms, use indigenous microorganisms for biofilm enhancement treatment, reduce the inadaptability of additional added bacterial agents, can be effective for a long time, and reduce the cost and risk of additional added nutrient sources and microorganisms. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a front view of the present invention;

[0038] Figure 2 is a side view of the present invention;

[0039] Figure 3 It is an assembly effect diagram of the present invention;

[0040] Figure 4 The isolation belt of the present invention is implemented Figure 1 ;

[0041] Figure 5 The isolation belt of the present invention is implemented Figure 2 .

[0042] In the figure: 1. buoy; 2. connecting hole; 3. three-dimensional elastic brush filler; 4. biomass filler; 5. isolation belt fixing frame; 6. sinking weight box; 7. filler; 8. water hole; 9. thick steel wire. DETAILED DESCRIPTION

[0043] The present invention will be further described below in conjunction with the accompanying drawings and embodiments:

[0044] Example 1

[0045] from Figure 1-2 It can be seen that the isolation belt device for isolating and treating acid mine drainage in this embodiment includes a plurality of isolation units, each of which includes a float 1, an isolation belt fixing frame 5 is provided at the bottom of the float 1, a sinking weight box 6 is provided at the bottom of the isolation belt fixing frame 5, and the sinking weight box 6 is filled with filler 7. The surface of the sinking weight box 6 is evenly provided with water holes 8, the arrangement of which can be adjusted at will, and the diameter of the water holes 8 is 2 cm;

[0046] The isolation belt fixed frame 5 is evenly distributed with connecting through holes 2 around it, the buoy 1 is fixedly connected to the connecting through hole 2 at the top of the isolation belt fixed frame 5 through a thick steel wire 9, and the sinking weight box 6 is fixedly connected to the connecting through hole 2 at the bottom of the isolation belt fixed frame 5 through a thick steel wire 9;

[0047] A biomass filler 4 is arranged in the isolation belt fixed frame 5, and three-dimensional elastic brush fillers 3 are bundled and arranged on the front and rear sides of the isolation belt fixed frame 5; the burr structure has a large contact area, which can promote the attachment of microorganisms, form a biofilm, and perform a barrier treatment on acid water;

[0048] The overall size and weight of the sinking weight box 6 are determined by the buoyancy of the early biomass filler 4. The biomass filler 4 is mainly made of straw, mixed with other slow-release carbon sources to prepare a curtain-like filler. The biomass filler 4 is porous inside, contains a large amount of air, has a large contact area with water, and has a large amount of buoyancy. It is difficult to sink automatically in the early stage. The buoyancy of the float 1 needs to withstand a 50kg weight;

[0049] The isolation zone fixing frame 5 has an outer length of 4.0 m, a width of 1.5 m, and a thickness of 2 cm. The three-dimensional elastic brush filler 3 has a length of 3.8 m, and two adjacent groups of three-dimensional elastic brush fillers 3 are spaced 30 cm apart.

[0050] The filler 7 is porous ceramsite, activated carbon particles, and biogas residue, and the mixing ratio is 1:1:3. The diameter of the porous ceramsite and activated carbon particles is 3 cm, which is larger than the diameter of the water hole 8;

[0051] By filling the filler 7, a sedimentation weight box 6 is formed which can provide a slow-release nutrient source, adsorb and fix heavy metals, and attach microorganisms;

[0052] A plurality of unit frames are arranged in the isolation belt fixing frame 5, and the biomass filler 4 is filled in each unit frame. The biomass filler 4 is 1m wide, 1.5m long, and 2cm thick, in a curtain shape; the length, width, and thickness can also be selected independently. The biomass filler 4 is fixed to the connecting through hole 2 on the side of the isolation belt fixing frame 5 by a thick steel wire 9.

[0053] Since the biomass filler 4 has gaps in its structure that allow acid water to pass through, microorganisms are attached to the three-dimensional elastic brush fillers 3 on both sides to form a biofilm, which promotes the treatment of acid water. The sludge in the filler 7 in the bottom sedimentation weight box 6 provides a slow-release nutrient source to promote the growth and metabolism of anaerobic microorganisms, and the internal porous ceramsite can attach microorganisms to promote anaerobic treatment of bottom water. In addition, the water holes 8 in the sedimentation weight box 6 promote water exchange. A large amount of dissolved oxygen can be generated by attaching algae to the upper layer, which promotes the metabolism of aerobic microorganisms in the upper and middle layers. At the same time, the sedimentation of algae after death can provide nutrition for the bottom microorganisms. The microorganisms attached to the middle and lower layers preliminarily treat the acid water entering the cracks, reduce heavy metals, acidity, and dissolved oxygen in advance, and optimize the internal environment of the acid reservoir.

[0054] Example 2

[0055] from Figure 3It can be seen that in the present embodiment, a barrier belt device for isolating and treating acid mine wastewater is provided, and multiple groups of isolation units are interconnected to form an integral barrier belt device. When connected, multiple groups of barrier belt fixing frames 5 are arranged in parallel along the width direction, and a float 1 is provided at the upper end of each group of barrier belt fixing frames 5, and a sinking weight box 6 is provided at the lower end of each group of barrier belt fixing frames 5; connecting through holes 2 are provided at intervals on the sides of the barrier belt fixing frames 5, and two adjacent groups of barrier belt fixing frames 5 are connected to each other by passing a thick steel wire 9 through the connecting through hole 2, thereby forming an integral barrier belt device.

[0056] The entire isolation belt device can be placed in water for a long time without taking it out and replacing it, and the slow-release carbon source function of the biomass filler 4 can have a long-term effect.

[0057] Example 3

[0058] from Figure 3 It can be seen that the method of the isolation belt device for blocking and treating acid mine wastewater in this embodiment is as follows:

[0059] According to the depth of 1-2m inward from the edge of the reservoir or lake, the length of the isolation belt fixed frame 5 is selected. The length-width ratio can be set according to the depth, and the length is temporarily set to 4m and the width is 1.5m. The biomass filler 4 is filled in the isolation belt fixed frame 5, which can be made into a 4m long, 1.5m long, and 2cm thick hanging curtain; the outer layer of the isolation belt fixed frame 5 is bound with a three-dimensional elastic brush filler 3 at an interval of 30cm;

[0060] The bottom of the isolation belt fixed frame 5 is connected to the sinking weight box 6 by a thick steel wire 9. The sinking weight box 6 is filled with porous ceramsite, activated carbon particles, and biogas residue in a mixing ratio of 1:1:3, which is fully mixed;

[0061] Two adjacent groups of isolation belt fixed frames 5 are connected by thick steel wires 9 through connecting through holes 2, and the bottom sinking weight boxes 6 are also connected in pairs; the buoy 1 is connected to the top of the isolation belt fixed frame 5 by thick steel wires 9, and the whole is vertically sunk into the water after the connection is completed;

[0062] The bottom sinking weight box 6 touches the bottom of the riverbed, and the buoy 1 ensures that the isolation zone fixing frame 5 is perpendicular to the water surface or inclined at a small angle of 0-10 degrees.

[0063] If the river bank has a corner, it can be ignored and placed in a straight line directly; if the river bank has different depths, the length of the isolation belt fixed frame can be modified according to the river bank depth, and then connected and placed as a whole;

[0064] The isolation belt device has its own weight and can be placed using a crane. After placement, check the condition of the biomass filler 4 every six months. If there is no crushing or other phenomena, there is no need for replacement and maintenance. It is estimated that the isolation belt can last for 3-4 years after placement.

[0065] The present invention uses biomass filler 4 as the main isolation material, and a lightweight and high-strength metal material is used as the isolation belt fixed frame 5 on the outside to fix it. The inside is filled with suspended biomass filler 4, and a porous hollow sinking weight box 6 is used at the bottom. The inside is filled with activated carbon, porous ceramsite, and sludge, and the sinking weight box 6 is fixed to the bottom of the isolation belt fixed frame 5. The top of the isolation belt fixed frame 5 is connected to the buoy 1, and the side is vertically fixed with a three-dimensional elastic brush filler 3, so that the whole is vertically fixed to the edge of the reservoir. Due to the changeable shape of the reservoir coast, a plurality of such devices can be used in combination to form a barrier belt.

[0066] The present invention has a simple structure and can be effectively assembled according to the on-site conditions. It can better meet the needs of on-site implementation, and the device can reach the bottom and process at multiple depths. It can reduce the dissolved oxygen concentration entering the AMD, gradually improve the bottom environment, promote the growth of anaerobic microorganisms, use indigenous microorganisms for biofilm enhancement treatment, reduce the inadaptability of additional added bacterial agents, can be effective for a long time, and reduce the cost and risk of additional added nutrient sources and microorganisms.

[0067] The present invention abandons the energy consumption of the existing ex situ treatment process, uses the enrichment and biofilm formation of indigenous microorganisms, reduces the environmental risks that may be caused by the additional addition of microorganisms from other sources, and at the same time the biomass filler 4 can provide a slow-release carbon source, reducing the organic pollution caused by the additional addition of other nutrient sources (for example, biogas slurry).

[0068] The present invention can penetrate deep into the bottom of the AMD reservoir, increase the water layer that cannot be touched by the existing device, and at the same time reduce the input of dissolved oxygen, optimize the anaerobic environment of the bottom of the AMD, and promote the growth of anaerobic microorganisms. A large amount of algae is enriched in the shallow part of the present invention, and its death can provide a carbon source for the anaerobic microorganisms at the bottom. The biomass filler 4 provides a slow-release carbon and nitrogen source to promote the growth of microorganisms.

[0069] In the present invention, algae and aerobic microorganisms are attached to the upper part, facultative anaerobic microorganisms are attached to the middle part, and anaerobic microorganisms are attached to the bottom. The straw can provide slow-release carbon and nitrogen for the microorganisms to promote their growth. At the same time, the AMD entering the fissures can be preliminarily treated to consume dissolved oxygen, reduce acidity and metal concentration, reduce the dissolved oxygen in the bottom water, inhibit the acidity generated by ferrous oxidation, and at the same time fix the secondary minerals produced in situ to reduce metal release.

[0070] The present invention can adapt to the original ecological environment of the AMD reservoir, does not require additional nutrient elements, uses biomass fillers, three-dimensional elastic brush fillers, and porous ceramsite for biological film hanging, and the AMD indigenous algae have the characteristic of adhering to the wall. The present invention provides attachment points and can process the AMD in advance.

[0071] In the prior art, the use of microorganisms such as sulfate-reducing bacteria (SRB) and green algae that are suitable for extremely acidic conditions can effectively treat acid mine wastewater, increase the pH value of wastewater, and effectively remove a variety of harmful heavy metals. At the same time, this method has the advantages of low cost, no secondary pollution, and can recover heavy metals in AMD;

[0072] The use of the isolation zone device of the present invention in conjunction with the above-mentioned treatment process can, on the one hand, alleviate the input of oxidizing force in fresh acid water into the reservoir, and on the other hand, simultaneously repair the reservoir water body inside the isolation zone, thereby achieving synchronous management and achieving better management effects.

[0073] Example 4

[0074] from Figure 4 It can be seen that the in-situ barrier treatment effect of the high-speed rail AMD reservoir is:

[0075] In a high-speed rail AMD reservoir, the side near the dump is most prone to runoff and fissure water inflow, so an isolation belt is placed on this side. The best time to place the isolation belt is in spring, when the temperature gradually rises and is suitable for algae growth.

[0076] After 30 days of placement, a large number of algae in the reservoir attached to the isolation zone. Vertical water samples from the center of the reservoir and the isolation zone were compared. The results showed that the chlorophyll a content in the shallow water was significantly higher than that in the center of the lake. The laying of the isolation zone can promote the attachment of algae to the upper layer of the isolation zone, and the dissolved oxygen in the upper layer is significantly higher than that in the center of the reservoir. Although the pH at the isolation zone is slightly higher than that at the center of the reservoir, the acidity is significantly reduced by about 40%. Due to the laying of the isolation zone, the dissolved oxygen concentration in the bottom layer is significantly reduced, which reduces iron oxidation, promotes the metabolism of sulfate-reducing bacteria, and reduces the sulfate concentration in the bottom layer. In addition, the AMD reservoir is mainly regulated by the Fe redox cycle, which makes the natural attenuation process of the acid reservoir slow, but the laying of the isolation zone can significantly reduce the iron content and fix Fe in other forms.

[0077] Overall, the laying of the isolation belt has a significant effect and can alleviate the pressure on water treatment in the AMD reservoir.

[0078] Example 5

[0079] from Figure 5 It can be seen that the in-situ barrier treatment effect during the acid neutralization of the AMD reservoir

[0080] In a high-speed rail AMD reservoir, the side near the dump is most prone to runoff and fissure water inflow, so an isolation belt is placed on this side. The best time to place the isolation belt is in spring, when the temperature gradually rises and is suitable for algae growth.

[0081] After 180 days of placement, the AMD reservoir has just completed acid neutralization, causing the pH of the surface water to rise above 6.5. Due to the large amount of algae attached to the isolation zone, the algae produce alkali, making the pH of the isolation zone significantly higher than the center of the reservoir. The vertical water samples of the center of the reservoir and the isolation zone were compared. Due to acid neutralization, a large number of algae in the reservoir died and disappeared, but the results showed that the chlorophyll a content of the shallow water at the isolation zone was still high, indicating that an algae attachment layer had been formed in the upper layer, and after the acid neutralization was completed, the algae diffused and grew outward under the promotion of slow-release carbon sources. Due to the large amount of water in the reservoir, acid neutralization can only ensure that the pH of the shallow water increases. The pH of the shallow water is higher than 7.0, so the acidity is almost 0 mg / L, and the Fe metal concentration is almost 0 mg / L. The data show that the acidity of the middle and lower water layers has been significantly reduced by about 30%. Due to the laying of the isolation zone, the dissolved oxygen concentration in the bottom layer has been significantly reduced, which reduces iron oxidation, promotes the metabolism of sulfate-reducing bacteria, and reduces the sulfate concentration in the bottom layer. In addition, AMD reservoirs are mainly regulated by Fe redox cycles, which slows the natural decay of acidic reservoirs. However, the laying of isolation belts can significantly reduce the iron content and fix Fe in other forms. Due to the long placement time of isolation belts, the metal fixation capacity is significantly higher than the result of laying for 30 days, and the metal concentration is reduced by about 50%. In addition, due to the long-term laying of isolation belts, the overall Fe concentration of acidic reservoirs is reduced by about 10%.

[0082] Overall, the laying of the isolation belt has a significant effect and can alleviate the pressure on water treatment in the AMD reservoir.

[0083] The present invention and its embodiments are described schematically above, and the description is not restrictive. The drawings show only one embodiment of the present invention, and the actual structure is not limited thereto. Therefore, if a person skilled in the art is inspired by it and designs a structural method and an embodiment similar to the technical solution without creativity without departing from the purpose of the invention, they shall all fall within the protection scope of the present invention.

Claims

1. An isolation zone device for isolating and treating acid mine drainage, comprising a plurality of isolation units, each of which is provided with a buoy (1), characterized in that: The bottom of the buoy (1) is provided with an isolation belt fixing frame (5), the bottom of the isolation belt fixing frame (5) is provided with a sinking weight box (6), and the sinking weight box (6) is filled with a filler (7); The isolation belt fixing frame (5) is provided with a biomass filler (4), and three-dimensional elastic brush fillers (3) are bound and arranged on both the front and rear sides of the isolation belt fixing frame (5).

2. The isolation zone device for isolating and treating acid mine drainage according to claim 1 is characterized by: The isolation belt fixed frame (5) is evenly distributed with connecting holes (2) around it, the buoy (1) is fixedly connected to the connecting hole (2) at the top end of the isolation belt fixed frame (5) through a thick steel wire (9), and the sinking weight box (6) is fixedly connected to the connecting hole (2) at the bottom end of the isolation belt fixed frame (5) through a thick steel wire (9).

3. The isolation zone device for isolating and treating acid mine drainage according to claim 2 is characterized by: The surface of the sinking weight box (6) is evenly provided with water holes (8), and the diameter of the water holes (8) is 2 cm.

4. The isolation zone device for isolating and treating acid mine drainage according to claim 2 is characterized in that: A plurality of isolation units are interconnected to form an integrated isolation belt device. A plurality of isolation belt fixed frames (5) are arranged in parallel along the width direction. A buoy (1) is arranged at the upper end of each isolation belt fixed frame (5), and a sinking weight box (6) is arranged at the lower end of each isolation belt fixed frame (5).

5. The isolation zone device for isolating and treating acid mine drainage according to claim 4 is characterized by: The side edges of the isolation belt fixing frames (5) are provided with connection through holes (2) at intervals, and two adjacent groups of isolation belt fixing frames (5) are connected to each other by passing a thick steel wire (9) through the connection through holes (2).

6. The isolation zone device for isolating and treating acid mine drainage according to claim 5 is characterized by: The isolation belt fixing frame (5) is 4.0m long, 1.5m wide and 2cm thick. The three-dimensional elastic brush filler (3) is 3.8m long. The interval between two adjacent groups of three-dimensional elastic brush fillers (3) is 30cm.

7. The isolation zone device for isolating and treating acid mine drainage according to claim 6 is characterized by: The filler (7) is porous ceramsite, activated carbon particles, and biogas residue, the mixing ratio of which is 1:1:3, and the diameters of the porous ceramsite and activated carbon particles are 3 cm.

8. The isolation zone device for isolating and treating acid mine drainage according to claim 7 is characterized by: The isolation belt fixing frame (5) is provided with a plurality of unit frames, and a biomass filler (4) is filled in each unit frame. The biomass filler (4) is 1 m wide, 1.5 m long, and 2 cm thick, and is in a curtain shape. The biomass filler (4) is fixed to the connecting through hole (2) on the side of the isolation belt fixing frame (5) through a thick steel wire (9).

9. The method of the isolation zone device for isolating and treating acid mine drainage according to claim 8, characterized in that: The length of the isolation belt fixed frame (5) is selected according to the depth of 1-2 m inward from the edge of the reservoir or lake, and the isolation belt fixed frame (5) is filled with biomass filler (4); the outer layer of the isolation belt fixed frame (5) is bound with three-dimensional elastic brush filler (3) at intervals of 30 cm; The bottom of the isolation belt fixed frame (5) is connected to the sinking weight box (6) by a thick steel wire (9), and the sinking weight box (6) is filled with porous ceramsite, activated carbon particles, and biogas residue in a mixing ratio of 1:1:3, which are fully mixed; Adjacent isolation belt fixed frames (5) are connected by thick steel wires (9) through connecting through holes (2), and bottom sinking weight boxes (6) are connected in pairs; the buoy (1) is connected to the top of the isolation belt fixed frame (5) by thick steel wires (9), and vertically sinks into the water after the overall connection is completed; The bottom sinking weight box (6) touches the bottom of the riverbed, and the buoy (1) ensures that the isolation zone fixing frame (5) is perpendicular to the water surface or inclined at a small angle of 0-10 degrees.

10. The method of the isolation zone device for isolating and treating acid mine drainage according to claim 9, characterized in that: The isolation belt device has its own weight and can be placed by a crane. After placement, the condition of the biomass filler (4) is checked every six months. If there is no crushing or other phenomena, no replacement or maintenance is required.

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