CN219279612U

CN219279612U - Cascade permeable reaction wall system suitable for abandoned acid mine

Info

Publication number: CN219279612U
Application number: CN202320202974.2U
Authority: CN
Inventors: 叶振亚; 张安鹏; 董仁君; 田靓; 张亭亭; 赵颖
Original assignee: China City Environment Protection Engineering Ltd
Current assignee: China City Environment Protection Engineering Ltd
Priority date: 2023-02-14
Filing date: 2023-02-14
Publication date: 2023-06-30
Anticipated expiration: 2033-02-14

Abstract

The utility model relates to the technical field of groundwater environment pollution treatment, in particular to a cascade permeable reactive barrier system suitable for abandoned acid mines, which comprises a plurality of stages of permeable reactive barriers arranged in a cascade form at the downstream of the groundwater in a slag pile area, wherein the first stage of permeable reactive barrier to the penultimate stage of permeable reactive barrier are arranged in the slag pile and are perpendicular to the groundwater flow direction, and the last stage of permeable reactive barrier is arranged outside the slag pile and is perpendicular to the groundwater flow direction. According to the utility model, the traditional permeable reactive barrier is divided into a plurality of stages of permeable reactive barriers which are arranged in a step mode at a certain interval in the underground water downstream of the area, so that the one-time excavation amount and the excavation difficulty can be reduced, the polluted underground water can be treated in multiple stages and steps, the treatment pressure of the traditional permeable reactive barrier is reduced, the engineering flexibility is increased, and the operation and maintenance in the later stage are reduced to a certain extent.

Description

Cascade permeable reaction wall system suitable for abandoned acid mine

Technical Field

The utility model relates to the technical field of groundwater environment pollution treatment, in particular to a cascade permeable reactive barrier system suitable for abandoned acid mines.

Background

With the rapid development of society, extensive mining has gradually not met the demand of society for environmental protection, and more mines gradually exit from a historical stage due to the fact that the demand of environmental protection is not met, and a large amount of waste slag is left to continuously increase the environmental pollution pressure of an area, so that serious pollution is caused to the water and soil environment of the area. Slag, waste stones and waste residues left from mining and smelting are stacked in a mine area in a disordered and exposed mode, most of the waste mine areas are located in mountain areas, the slag and the waste stones are stacked on gullies and side slopes in a disordered mode, heavy metals, sulfur and other pollution factors in the slag and waste stones are gradually released into a water body under the action of bacteria after being soaked for a long time, formed acidic wastewater seriously damages regional water environment, local drinking water and domestic production water safety can be influenced, and serious influence is possibly caused on the health of residents.

Slag, waste stones, slag soil and the like left in mining areas abandoned for many years are mostly polluted II-type solid wastes under long-time natural mixing accumulation, so that when the mining areas abandoned are treated, seepage prevention is carried out on slag piles, which is an effective treatment measure for reducing acid wastewater, but shallow groundwater can cause certain pollution, and the existing treatment technology in the acid wastewater treatment industry mostly needs subsequent large-scale maintenance operation, so that the technical measures for treating the pollution of the underground water in the mining areas abandoned are needed to be developed, which meet the environmental protection requirements and are low in maintenance operation.

Disclosure of Invention

The utility model aims to provide a step permeable reactive barrier system suitable for abandoned acid mines, which not only can realize large-scale and low-operation maintenance in the later period, but also can realize multi-stage and step-by-step treatment of polluted groundwater.

In order to achieve the above purpose, the technical scheme of the utility model is that the cascade permeable reactive barrier system suitable for the abandoned acid mine comprises a plurality of stages of permeable reactive barriers which are arranged in a cascade form at the underground water downstream of a slag pile body region, wherein the first stage of permeable reactive barrier to the second last stage of permeable reactive barrier are all arranged in the slag pile body and are perpendicular to the flow direction of underground water, and the last stage of permeable reactive barrier is arranged outside the slag pile body and is perpendicular to the flow direction of underground water.

Further, the bottoms of the permeable reactive barrier at each stage are each located at least 2m below the weakly weathered layer of the underlying bedrock of the slag stack.

Further, each level of permeable reactive barrier includes a permeable barrier and a pharmaceutical agent filler disposed within the permeable barrier.

Still further, the medicament filler is provided in a plurality of layers, each layer being filled with limestone particles.

Still further, gaps of the limestone particles are filled with quartz sand particles.

Further, the limestone particles have a particle size of 2-5mm.

Further, the permeable reactive barrier from the first permeable reactive barrier to the second permeable reactive barrier is arranged at a position with a lower gradient of the slag pile.

Compared with the prior art, the utility model has the beneficial effects that:

(1) According to the utility model, in the underground water downstream area of the slag pile body area, the traditional permeable reactive barrier is divided into a plurality of stages of permeable reactive barriers which are arranged in a stepped mode at a certain interval, the permeable reactive barrier from the first stage to the second last stage is arranged in the slag pile body, and the permeable reactive barrier from the last stage is arranged outside the slag pile body, so that the one-time excavation amount and the excavation difficulty can be reduced, the polluted underground water can be treated in multiple stages and steps, the produced acid wastewater is fully neutralized, the treatment pressure of the traditional permeable reactive barrier is reduced, the flexibility of engineering is increased, and the operation and maintenance in the later stage are reduced to a certain extent;

(2) The bottoms of the permeable reactive barrier at each level are all positioned at least 2m below the weak weathering layer of the bedrock below the slag pile body, so that the polluted underground water is fully treated as much as possible and the stability of the permeable reactive barrier at each level is ensured;

(3) According to the utility model, the traditional Chinese medicine agent filler of each level of permeable reactive barrier is arranged in multiple layers, each layer is filled with limestone particles, so that generated wastewater can be effectively neutralized to be acidic, and gaps among the limestone particles are filled with quartz sand particles, so that the permeability of the agent filler is ensured.

Drawings

In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a cross-sectional view of a step permeable reactive barrier system suitable for use in an abandoned acid mine in accordance with an embodiment of the present utility model;

FIG. 2 is a top view of a step permeable reactive barrier system suitable for use in abandoned acid mines according to an embodiment of the utility model;

in the figure: 1. a slag pile; 2. strong/stroke resolution layer; 3. weak weathering layers; 4. a groundwater level; 5. the groundwater flows; 6. a first-stage permeable reactive barrier; 7. a secondary permeable reactive barrier; 8. a third-stage permeable reactive barrier; 9. slag pile boundaries.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

The embodiment of the utility model provides a cascade permeable reactive barrier system suitable for an abandoned acid mine, which comprises a plurality of stages of permeable reactive barriers arranged in a cascade form at the underground water downstream of a slag pile area, wherein the first stage of permeable reactive barrier to the penultimate stage of permeable reactive barrier are all arranged in the slag pile 1 and perpendicular to the flow direction of groundwater, and the last stage of permeable reactive barrier is arranged outside the slag pile 1 and perpendicular to the flow direction of groundwater.

Aiming at the characteristics of underground water pollution of abandoned acid mines and the path of underground water migration in mountain areas, and combining the accumulation and distribution forms of the mountain area slag pile body 1 and the topography height difference characteristics of the sites, the embodiment divides a traditional permeable reaction wall into a plurality of stages of permeable reaction walls which are arranged in a stepped form at certain intervals in the area underground water downstream area, and arranges the permeable reaction walls of the first stage to the permeable reaction walls of the second last stage in the slag pile body 1, wherein the permeable reaction walls of the last stage are arranged outside the slag pile body 1, so that the disposal excavation difficulty and excavation difficulty can be reduced, the polluted underground water can be treated in multiple stages and steps, the generated acid wastewater is fully neutralized, the treatment pressure of the traditional permeable reaction walls is reduced, the engineering flexibility is increased, and the maintenance of later stages is reduced to a certain extent.

As an embodiment, as shown in fig. 1 and 2, the permeable reactive barrier has three stages, namely, a primary permeable reactive barrier 6, a secondary permeable reactive barrier 7 and a tertiary permeable reactive barrier 8 which are arranged in a cascade form and are all arranged in the underground water downstream of the slag pile area, wherein the primary permeable reactive barrier 6 and the secondary permeable reactive barrier 7 are both arranged in the slag pile 1 and are perpendicular to the flow direction of the underground water, and the tertiary permeable reactive barrier 8 is arranged outside the slag pile 1 and is perpendicular to the flow direction of the underground water.

The total thickness of the permeable reactive barrier at each level in this embodiment may be calculated according to the technical guidelines for permeable reactive barrier for groundwater pollution (trial), and is specifically related to factors such as mine pile, regional water content, and design service life, and the number of stages of the permeable reactive barrier needs to be specifically determined according to the site and gradient conditions. When the thickness of the single-stage permeable reactive barrier is designed, the thickness of each graded permeable reactive barrier can be flexibly adjusted according to site conditions, and in the range allowed by engineering, the thickness of each graded permeable reactive barrier can be properly increased according to the minimum thickness of each graded permeable reactive barrier so as to increase the effective treatment time of the graded permeable reactive barrier and reduce the maintenance and operation cost of the post-filling reaction material. The slag pile body 1 of the embodiment is subjected to field sealing and surface anti-seepage engineering, so that the water quantity permeated into the slag pile body 1 can be greatly reduced, and the acidic wastewater is reduced from the source, thereby reducing the total thickness of the permeable reaction wall and reducing the cost.

Further, the bottoms of the permeable reactive barriers at each stage are all located at least 2m below the weakly weathered layer 3 of the bedrock below the slag stack 1, so that the polluted groundwater is fully treated as much as possible and the stability of the permeable reactive barriers at each stage is ensured.

Further, each level of permeable reactive barrier includes a permeable barrier and a pharmaceutical agent filler disposed within the permeable barrier. Still further, the medicament filler is provided in a plurality of layers, each layer being filled with limestone particles. Further, the limestone particles have a particle size of 2-5mm. Because the waste water generated by the abandoned acid mine is acidic, and the technical principle of a neutralization method is combined, the active ingredients of the medicament filling material of the embodiment adopt limestone particles and are filled in layers.

In order to ensure the permeability of the medicament filler, gaps of the limestone particles are filled with quartz sand particles. The limestone and the quartz sand have the advantages of easy acquisition, no secondary pollution basically and easy construction, and the limestone and the quartz sand are mixed according to a proper proportion for use, so that the blocking of the permeable reaction wall can be effectively prevented, and the permeability of the permeable reaction wall is ensured. When the limestone and quartz sand mixture is filled, the compactness of the whole medicament filling is ensured, so that the whole permeable reaction wall body does not influence the whole stability of the slag pile body 1.

In this embodiment, the layout positions of the permeable reactive barriers at each level need to be specifically considered in combination with the slope and the site situation of the slag pile body 1 after shaping, where the permeable reactive barriers at the first level to the penultimate level are disposed at the position where the slope of the slag pile body 1 is slower, so that construction excavation is facilitated, and disturbance to the pile body can be reduced to a certain extent.

The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.

Claims

1. Step permeable reactive barrier system suitable for acid mine is abandoned, its characterized in that: the method comprises a plurality of stages of permeable reactive barriers which are arranged in a cascade mode at the underground water downstream of a slag pile body region, wherein the first stage of permeable reactive barrier to the penultimate stage of permeable reactive barrier are all arranged in the slag pile body and perpendicular to the flow direction of underground water, and the last stage of permeable reactive barrier is arranged outside the slag pile body and perpendicular to the flow direction of underground water.

2. The step permeable reactive barrier system for use in abandoned acid mines according to claim 1, wherein: the bottoms of the permeable reactive barrier at each stage are each located at least 2m below the weakly weathered layer of the underlying bedrock of the slag pile.

3. The step permeable reactive barrier system for use in abandoned acid mines according to claim 1, wherein: each level of permeable reactive barrier comprises a permeable barrier body and a medicament filler disposed within the permeable barrier body.

4. A cascade permeable reactive barrier system for use in a waste acid mine as claimed in claim 3, wherein: the medicament filler is arranged in a plurality of layers, and each layer is filled with limestone particles.

5. The step permeable reactive barrier system for use in abandoned acid mines according to claim 4, wherein: and gaps among the limestone particles are filled with quartz sand particles.

6. The step permeable reactive barrier system for use in abandoned acid mines according to claim 4, wherein: the particle size of the limestone particles is 2-5mm.

7. The step permeable reactive barrier system for use in abandoned acid mines according to claim 1, wherein: the permeable reactive barrier from the first stage to the second last stage is arranged at the position with a slower gradient of the slag pile.