A treatment system for microbial remediation of acid mine drainage induced acidic wastewater

Abstract

The utility model discloses a kind of for microorganism management acid wastewater caused by hilltop mining processing system, comprising: from high to low arrangement's collection pool (1), pH adjusting pool (2), dynamic reaction pool (3) and sedimentation tank (4), collection pool is used to collect acid wastewater caused by hilltop mining, and connect with downstream's pH adjusting pool;pH adjusting pool is used to adjust the pH value of wastewater from collection pool, and connect with downstream's dynamic reaction pool;Dynamic reaction pool is used to process wastewater from pH adjusting pool, and connect with downstream's sedimentation tank;Sedimentation tank is used to receive wastewater treated by dynamic reaction pool and carry out sedimentation treatment;Wherein, the processing system further includes strain cultivation pool (6), the height of the strain cultivation pool (6) is higher than the dynamic reaction pool, and is connected with dynamic reaction pool to provide strain for dynamic reaction pool to carry out SRB biological treatment wastewater.

Description

Technical Field

[0001] This utility model relates to the field of environmental protection technology in mining, specifically to a treatment system for treating acidic wastewater caused by mining on mountain tops using microorganisms. Background Technology

[0002] As shallow and easily accessible coal resources dwindle, open-pit mountaintop mining is increasingly prevalent in hilly areas. This process involves stripping large amounts of rock and soil and filling valleys and gullies to extract economically valuable coal from mountains. Because coal generally contains sulfur, and given the complex terrain of hilly areas, the sulfur-containing coal seams or surrounding rocks exposed during mining are easily oxidized, forming acidic wastewater. In high-altitude mountaintop areas, this wastewater is not easily retained or accumulated; instead, driven by geodynamics, it flows rapidly down the slope, readily entering downstream surface water bodies, causing pollution diffusion and significantly increasing the difficulty and cost of downstream water quality treatment. Furthermore, mountaintop areas often contain local water sources, which are also susceptible to the impact of mining activities. In hilly areas with frequent rainfall, these environmental problems are exacerbated, further threatening the surrounding ecosystems.

[0003] Currently, the common technique for treating acidic wastewater is chemical neutralization, which often uses flocculants for neutralization and precipitation. However, traditional chemical neutralization methods suffer from problems such as high material consumption and high costs.

[0004] Therefore, given the characteristics of mining activities in such terrain and acidic wastewater, there is an urgent need for new technological methods to at least partially address the shortcomings of existing technologies and eliminate or prevent potential environmental pollution problems. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a treatment system for the microbial treatment of acidic wastewater generated from mining on mountain tops. This system can make reasonable use of the terrain advantages, reduce energy consumption, and meet wastewater discharge standards after multi-stage treatment.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A treatment system for the microbial treatment of acidic wastewater caused by mining on a mountaintop includes: a collection tank (1) arranged from high to low along the mountainside, a pH adjustment tank (2), a dynamic reaction tank (3), and a sedimentation tank (4).

[0008] Among them, the collection tank (1) is used to collect acidic wastewater caused by mining on the mountain top and is connected to the downstream pH adjustment tank (2); the pH adjustment tank (2) is used to adjust the pH value of the wastewater from the collection tank (1) and is connected to the downstream dynamic reaction tank (3); the dynamic reaction tank (3) is used to treat the wastewater from the pH adjustment tank (2) and is connected to the downstream sedimentation tank (4); the sedimentation tank (4) is used to receive the wastewater treated by the dynamic reaction tank (3) and perform sedimentation treatment.

[0009] The treatment system also includes a microbial culture tank (6), which is set at a height higher than the dynamic reaction tank (3) and is connected to the dynamic reaction tank (3) to provide microbial strains for the dynamic reaction tank (3) to carry out SRB biological treatment of wastewater.

[0010] According to the implementation scheme of this utility model, the treatment system for treating acidic wastewater caused by mining on the mountaintop by microorganisms further includes a temperature replenishment tank (5), which is set at a height higher than the dynamic reaction tank (3) and is connected to the dynamic reaction tank (3) to provide temperature compensation for the dynamic reaction tank (3).

[0011] According to the implementation scheme of this utility model, the treatment system for treating acidic wastewater caused by mining on the mountaintop by microorganisms further includes a microbial culture tank (6), which is set at a height higher than the dynamic reaction tank (3) and is connected to the dynamic reaction tank (3) and the temperature replenishment tank (5).

[0012] According to the embodiment of this utility model, the treatment system for treating acidic wastewater caused by mining on a mountaintop using microorganisms further includes a transplanted strain pool (7), an organic carbon source pool (8), and a compound carbon source pool (9) set at a height higher than the strain cultivation pool (6). The transplanted strain pool (7) is connected to the strain cultivation pool (6), the organic carbon source pool (8) is connected to the strain cultivation pool (6) and the dynamic reaction pool (3), and the compound carbon source pool (9) is connected to the strain cultivation pool (6) and the dynamic reaction pool (3).

[0013] According to the embodiments of the present invention, the treatment system for treating acidic wastewater caused by mining on the mountaintop with microorganisms further includes a filter tank (11) which is set at a height lower than the sedimentation tank (4) and connected to the sedimentation tank (4).

[0014] According to the embodiment of this utility model, the collection pool (1) includes a waterproof layer (1-1), a geotextile layer (1-2), a lime cushion layer (1-3), and a steel slag cushion layer (1-4).

[0015] According to the embodiment of this utility model, the heat replenishment pool (5) includes a solar panel and an electric heating rod (13) for providing a heat source for the heat replenishment pool.

[0016] According to the embodiment of this utility model, the dynamic reaction tank (3) and the sedimentation tank (4) are connected by a growth path reaction pipe (10).

[0017] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0018] 1. The method of using acid-resistant anaerobic microorganisms for treatment and arranging multi-stage reaction tanks according to the slope of the mining site on the mountain top can reduce energy consumption. Compared with the traditional chemical process that requires material and aeration steps, the method of this utility model has lower energy consumption and cost.

[0019] 2. The source control method at the mountain top overcomes or reduces the mixing of acidic wastewater from traditional mines with natural water flow or groundwater, reducing the amount of wastewater to be treated later; especially during the rainy season and heavy rainfall, it prevents infiltration and thus reduces the amount of wastewater to be treated.

[0020] 3. The treatment devices are arranged according to the terrain, reducing energy consumption during the treatment process and lowering application costs.

[0021] 4. Consider temperature compensation measures for the bacterial reaction vessel in winter to improve the effectiveness of SRB biotreatment. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a treatment system for the microbial treatment of acidic wastewater generated from mining on a mountaintop, according to the implementation plan.

[0023] Figure 2 This is a schematic diagram of the collection tank structure of a treatment system for microbial treatment of acidic wastewater generated from mountain mining, according to the implementation plan.

[0024] In the diagram, 1--collection tank; 2--pH adjustment tank; 3--dynamic reaction tank; 4--sedimentation tank; 5--temperature replenishment tank; 6--microbial culture tank; 7--transplanted strain tank; 8--organic carbon source tank; 9--compound carbon source tank; 10--growth path reaction tube; 11--filtration tank; 12--pipeline valve; 13--solar panel and heating rod. Detailed Implementation

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The content shown is intended to fully illustrate the content of the present invention, but is not intended to limit the present invention.

[0026] The main source of acidic wastewater in mining areas is the oxidation of sulfides in sulfur-containing coal seams, forming water-soluble sulfuric acid compounds. Sulfate-reducing bacteria (SRB) are a type of anaerobic or facultative anaerobic prokaryotic microorganisms that can reduce SO42-. 2- Revert to H2S or directly convert to S 2- S 2- Both sulfur dioxide and dissolved H2S can combine with heavy metal ions to form extremely insoluble metal sulfide precipitates, thus they can be used to treat acidic wastewater from mining areas. Typical sulfate-reducing bacteria (SRBs) have suitable survival and reaction conditions, including the pH of the incoming acidic wastewater (e.g., greater than 4.0), the temperature of the reaction tank water (generally not lower than 20°C), and the ratio of bacteria to acidic water. It should be understood that the SRB treatment process itself is well known to those skilled in the art and will not be described in detail here.

[0027] Figure 1 This is a schematic diagram of a treatment system for treating acidic wastewater caused by mining on a mountaintop, according to an implementation plan. As shown, the treatment system of the implementation plan may include a collection tank (1), a pH adjustment tank (2), a dynamic reaction tank (3), a sedimentation tank (4), a temperature replenishment tank (5), a microbial culture tank (6), a transplanted strain tank (7), an organic carbon source tank (8), a compound carbon source tank (9), and a filtration tank (11), with each component arranged along the mountainside. For example, the collection tank (1), pH adjustment tank (2), dynamic reaction tank (3), sedimentation tank (4), and filtration tank (11) are arranged sequentially from top to bottom and connected in series. The temperature replenishment tank (5) and the microbial culture tank (6) are interconnected and are set at a height higher than the dynamic reaction tank (3). The temperature replenishment tank (5) and the microbial culture tank (6) are also connected to the dynamic reaction tank (3). The transplanted strain tank (7), the organic carbon source tank (8), and the compound carbon source tank (9) are set at a height higher than the microbial culture tank (6) and are connected to the microbial culture tank (6). In addition, the organic carbon source tank (8) and the compound carbon source tank (9) are connected to the dynamic reaction tank (3). The volume capacity of each tank can be, for example, 1-5t, which can be set according to specific needs. Flow valves are installed between each tank to control the switching and flow rate. The components are described in detail below with reference to the attached drawings.

[0028] Figure 2This is a schematic diagram of the collection tank structure of a treatment system for microbial treatment of acidic wastewater generated from mining on a mountaintop, according to the implementation plan. Referring to the attached diagram, the collection tank (1) is used to collect wastewater generated from mining on a mountaintop, and it may include a waterproof layer (1-1), a geotextile layer (1-2), a lime cushion layer (1-3), and a steel slag cushion layer (1-4, etc.). Among them, the hydrostatic pressure resistance of the waterproof layer is not less than 0.1 MPa, the mass of the geotextile layer is not less than 200 g / m2, and the thickness of the lime layer and the steel slag layer is not less than 80 cm. The collection tank (1) is connected to the pH adjustment tank (2) and the temperature replenishment tank (5) through pipelines to provide them with water. Since it is set according to the terrain, the wastewater can be gravity-fed by utilizing the height difference and gravity, thus saving energy. In addition, a pipeline valve (12) is installed on the pipeline to control the flow rate.

[0029] After receiving wastewater from collection tank (1), pH adjustment tank (2) can detect its pH value and adjust the pH value according to the detection result to the pH value required for downstream SRB biological treatment. For example, the pH value of the wastewater can be adjusted to 4.0-6.0.

[0030] After adjustment, the water is discharged into the dynamic reaction tank (3). The dynamic reaction tank (3) is connected to the temperature replenishment tank (5), the microbial culture tank (6), the organic carbon source tank (8), and the compound carbon source tank (9). The temperature replenishment tank (5) is equipped with solar panels and electric heating rods (13) to provide a heat source for the water in the temperature replenishment tank. The heated water can be discharged into the dynamic reaction tank (3) and the microbial culture tank (6) to adjust the temperature of the water in the dynamic reaction tank (3) and the microbial culture tank (6) to make it suitable for microbial culture and microbial reaction. For example, the temperature of the temperature replenishment tank can be 40-60℃.

[0031] The microbial culture tank (6) is connected to the dynamic reaction tank (3), and the cultured microbial strains can be injected into the dynamic reaction tank (3). In this invention, acid-resistant sulfate-reducing bacteria are used as the strains for SRB biological treatment. For example, Desulfovibrio desulfuricans QY411 described in patent application No. 202510674236.1 (deposited at the Guangdong Provincial Microbial Culture Collection Center on March 14, 2024, with accession number: GDMCC No: 64412) can be used. The SRB strains can be transplanted into the transplanted strain tank (7), and after cultivation, further cultivation can be carried out in the culture tank (6). More specifically, for example, the temperature at which the strain is transferred from indoor to outdoor is greater than 20°C, and the optical density value (OD) of the strain concentration is... 600 Greater than 0.3, pH value greater than 6.

[0032] In addition, both microbial cultivation and biochemical reactions in the dynamic reaction tank require a certain carbon source. In this implementation plan, an organic carbon source tank (8) and a compound carbon source tank (9) are used to provide carbon sources. For example, the organic carbon source tank can be supplemented with materials such as rice straw, corn cob, sugarcane bagasse, peat, or compost as carbon sources, with a mass percentage of 5-10%; the compound carbon source tank can be supplemented with materials such as sodium lactate, acetic acid, ethanol, and propionic acid as carbon sources, with a concentration of 0.1-0.5 g / L. The carbon source water in the organic carbon source tank (8) and the compound carbon source tank (9) can be injected into the microbial cultivation tank (6) and the dynamic reaction tank (3). The ratio of organic carbon source to compound carbon source capacity can be about 2:1, and the flow rate can be controlled at 1-1.5 t / d.

[0033] As shown in the figure, the dynamic reaction tank (3) can be connected to the sedimentation tank (4) through the growth path reaction pipe (10) to expand the space for microorganisms to enter the dynamic reaction. The fluid after the reaction enters the sedimentation tank (4) for sedimentation. The treatment system of this utility model can treat acidic mine wastewater well and achieve good technical effects, such as the pH value of the effluent after sedimentation being greater than 6.0; the iron ion concentration being no greater than 1 mg / L and the manganese ion concentration being no greater than 4 mg / L.

[0034] After sedimentation, the water enters the filtration tank (11) for filtration and discharge.

[0035] This utility model's treatment system achieves beneficial technical effects, such as: 1) employing acid-resistant sulfate-reducing bacteria (SRB) biological treatment technology to reduce the transportation, storage, and consumption costs of chemical materials in traditional chemical neutralization methods; 2) arranging treatment devices according to the elevation difference of the mountaintop mining area to reduce energy consumption. Water at each stage is controlled by valves through the elevation difference, achieving gravity-guided flow; 3) source control. On the slopes of open-pit mountaintop mining, sulfur-containing rock layers are exposed to the air, carried out by fissure water, and seep from the rock walls, forming acidic wastewater. Collecting and treating the acidic wastewater at the source reduces the amount of wastewater that would otherwise be mixed in, thus significantly increasing the treatment volume. After centralized collection, water is guided to the next stage of treatment via a conduit; 4) temperature compensation measures improve biological treatment efficiency.

[0036] The embodiments of this utility model described above do not constitute a limitation on the scope of protection of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the scope of protection of the claims of this utility model.

Claims

1. A treatment system for microbial treatment of acidic wastewater caused by mining on mountain tops, characterized in that, include: The collection tank (1), pH adjustment tank (2), dynamic reaction tank (3), and sedimentation tank (4) are arranged from high to low along the mountainside. Among them, the collection tank (1) is used to collect acidic wastewater caused by mining on the mountain top and is connected to the downstream pH adjustment tank (2); the pH adjustment tank (2) is used to adjust the pH value of the wastewater from the collection tank (1) and is connected to the downstream dynamic reaction tank (3); the dynamic reaction tank (3) is used to treat the wastewater from the pH adjustment tank (2) and is connected to the downstream sedimentation tank (4); the sedimentation tank (4) is used to receive the wastewater treated by the dynamic reaction tank (3) and perform sedimentation treatment. The treatment system also includes a microbial culture tank (6), which is set at a height higher than the dynamic reaction tank (3) and is connected to the dynamic reaction tank (3) to provide microbial strains for the dynamic reaction tank (3) to carry out SRB biological treatment of wastewater.

2. The treatment system for microbial treatment of acidic wastewater caused by mining on mountain tops, as described in claim 1, is characterized in that... It also includes a temperature compensation tank (5), which is set at a height higher than the dynamic reaction tank (3) and is connected to the dynamic reaction tank (3) to provide temperature compensation for the dynamic reaction tank (3).

3. The treatment system for microbial treatment of acidic wastewater caused by mining on mountain tops, as described in claim 2, is characterized in that... It also includes a microbial culture tank (6), which is set at a height higher than the dynamic reaction tank (3) and is connected to the dynamic reaction tank (3) and the temperature replenishment tank (5).

4. The treatment system for microbial treatment of acidic wastewater caused by mining on mountain tops, as described in claim 3, is characterized in that... It also includes a transplanted strain pool (7), an organic carbon source pool (8), and a compound carbon source pool (9), which are set at a height higher than the strain cultivation pool (6). The transplanted strain pool (7) is connected to the strain cultivation pool (6), the organic carbon source pool (8) is connected to the strain cultivation pool (6) and the dynamic reaction pool (3), and the compound carbon source pool (9) is connected to the strain cultivation pool (6) and the dynamic reaction pool (3).

5. The treatment system for microbial treatment of acidic wastewater caused by mining on mountain tops, as described in claim 1, is characterized in that... It also includes a filter tank (11) that is set at a height lower than the sedimentation tank (4) and connected to the sedimentation tank (4).

6. The treatment system for microbial treatment of acidic wastewater caused by mining on mountain tops, as described in claim 1, is characterized in that... The collection pool (1) includes a waterproof layer (1-1), a geotextile layer (1-2), a lime cushion layer (1-3), and a steel slag cushion layer (1-4).

7. The treatment system for microbial treatment of acidic wastewater caused by mining on mountain tops, as described in claim 2, is characterized in that... The heating pool (5) includes a solar panel and an electric heating rod (13) for providing a heat source for the heating pool.

8. The treatment system for microbial treatment of acidic wastewater caused by mining on mountain tops, as described in claim 1, is characterized in that... The dynamic reaction tank (3) and the sedimentation tank (4) are connected by a growth path reaction pipe (10).

Images