KR101293168B1 - Passive treatment system for acid mine drainage and maintenance method of the same - Google Patents

Abstract

PURPOSE: A natural purifying facility for acid mine drainage and a method for managing the same are provided to cost-effectively facilitate maintenance and to improve performance such as the efficiency of purification, the stability of operations, the durability, and the reflectivity to the load change of pollution. CONSTITUTION: A natural purifying facility for acid mine drainage comprises an inflow unit (100), a reactive cell unit (200), an outflow unit (300), and a sludge washing water discharging unit (400). The reactive cell unit consists of an acid mine drainage layer, a base material layer, an alkaline supplying material layer, and an effluent layer. The acid mine drainage layer maintains a pre-determined level. The base material layer is filled with organic materials. The alkaline supplying material layer is filled with limestone or the mixture of organic materials and limestone. The effluent layer is filled with purified acid mine drainage. The base material layer and the alkaline supplying material layer are based on the arrangement of reaction blocks. The components and mixing ratio of the reaction blocks are standardized by the load of contamination according to the result of an adaptability test. The reaction blocks are modulated into a predetermined size in order to facilitate replacement.

Description

Acid Mine Drainage Natural Purification Treatment Facility and Maintenance Method {PASSIVE TREATMENT SYSTEM FOR ACID MINE DRAINAGE AND MAINTENANCE METHOD OF THE SAME}

The present invention relates to an acid mine drainage natural purification treatment facility and a maintenance method, and more particularly, in a treatment facility for natural purification of acid mine drainage by an alkali supply tank method using microorganisms and limestone, the reaction material layer is standard. It consists of an array of standard reaction blocks and allows the entire treatment facility to be operated by dividing it into a plurality of operating areas, improving performance such as purification efficiency, stability of operation, durability, and responsiveness to changes in pollution loads, and at low cost. The present invention relates to an acid mine drainage natural purification treatment facility, a maintenance method, and a post-treatment method of sludge, which can be easily maintained, and effectively treat the sludge inevitably generated in the natural purification treatment.

In general, there are natural purification methods, physicochemical methods, and electrochemical methods for purifying mine drainage with high acidity and high heavy metal content. Among them, the natural purification method is nature-friendly, low-cost site management is possible, and underdeveloped areas. There is also a suitable advantage, has been applied to a lot of domestic low concentration mine drainage site.

Representative natural purification methods include the SAPS tank method of the alkali supply tank method which can simultaneously reduce the heavy metals and neutralize the alkali by using microorganisms and limestone, and the RAPS tank method and the MAPS tank method of the improved type. Basically, a top-down purification reactor is used, which is equipped with a reactive material layer of an organic material layer and a limestone material layer under the wastewater layer. The substrate material layer aimed at activating sulfate reduction bacteria (SRB) through the supply of stable organic materials is mostly constructed by mixing various organic materials which are easily available on site.

In the alkali supply tank system as described above, there is a disadvantage in that it is vulnerable to the response due to the fluctuations in the wastewater flow rate and the pollution load, and the substrate material layer is often unevenly constructed due to the randomness of the construction depending on the site manpower. Due to deterioration of the properties and concentration of flow paths, there is a problem that the purification efficiency is drastically reduced due to the loss of the reactive material layers such as the substrate material layer and the alkali supply material layer, poor maintenance of the anaerobic state, and instability of the alkali supply. Although metal sulfides and metal hydroxides are precipitated on the substrate material layer due to the natural oxidation reaction, the permeability is deteriorated and the flow paths are concentrated. However, even in this case, there is no method other than the front-end renovation in the prior art. In addition to the related technologies, sludge inevitably generated from natural purification treatments is effectively The development of a technique that can be more easily processed in a situation urgently needed.

SUMMARY OF THE INVENTION An object of the present invention is to solve a problem in the prior art in a treatment facility for naturally purifying acid mine drainage using an alkali supply tank method, thereby purifying efficiency, operational stability, durability, responsiveness to pollution load variation, and the like. It is to provide an acid mine drainage natural purification treatment facilities and treatment methods to improve the performance of.

Another object of the present invention is to solve the problem of stopping the operation of the treatment plant and renovating the entire surface for the collection of the settling sludge and the replacement of the reactant layer in the prior art, so that it can be easily maintained at low cost, and natural The present invention relates to a maintenance method and an aftertreatment method of sludge in an acid mine drainage natural purification treatment plant which enables effective post-treatment of sludge inevitably generated in a purification process.

The acid mine drainage natural purification treatment facility, maintenance method and sludge aftertreatment method of the present invention for achieving the above technical problem, the inlet portion having a passage for the acid mine drainage is supplied to the upper part of the reaction vessel, the constant water level Reaction cell part consisting of an acid mine drainage layer which maintains a, a substrate material layer filled with an organic material, an alkali feed material layer filled with limestone or a mixture of organic material and limestone, and an effluent layer of purified acid mine drainage, and a water level control gate It characterized in that it comprises an outlet and a sludge washing water discharge portion having.

The substrate material layer and the alkali feed material layer are arranged in an array of reaction blocks modularized to a predetermined size suitable for replacement, based on the results of prior applicability tests, according to the contamination load. It is characterized in that the configuration.

The reaction block is characterized in that the upper surface of each reactant layer composed of the arrangement of each reaction block is installed to have a slope of 3 to 10 degrees.

The reaction block is characterized in that the upper and lower portions of each reaction block is provided with a porous plate such as a porous plate or a mesh.

The reaction block is characterized in that it has a reaction cell frame provided with a support for supporting the reaction block.

The reaction cell unit is divided into the reaction cell frame, and has a plurality of reaction cell channels formed of the substrate material reaction block and the alkali feed material reaction block.

The reaction cell unit is characterized in that it has a driving zone frame for separating the acid mine drainage to form a separate acid mine drainage layer.

In the acid mine drainage treatment facility of the present invention, the operation zone selection gate and the reaction cell inlet of the inlet part, which can independently select the supply and blocking of the acid mine drainage by operation zone, and the flow path of the acid mine drainage as independent operation zones. The operation zone frame of the reaction cell section to separate, the reaction cell outlet of the outlet section to discharge the purified water of the operating zone independently and control the water level, the operating zone selection gate and the water level control outflow gate are provided to control the acid mine drainage. It is characterized by including a plurality of operating zones independent of supply and interruption.

The driving zone includes a sludge washing water discharge portion of the sludge washing water discharge portion, a driving zone selection gate, and a sludge washing water discharge gate so that the sludge washing water on the substrate material layer can be separated and collected by each operating zone and discharged through the sludge washing water discharge gate. It is characterized by.

In the maintenance method of the acid mine drainage treatment facility of the present invention, selecting an operation zone for maintenance and maintenance, blocking the inflow of acid mine drainage by the operation zone selection gate of the inlet and the hydrology of the reaction cell inlet. Step, lowering the water level of the reaction cell by the hydrologic operation of the reaction cell outlet of the outlet, the operation zone selection gate and the water level control gate, washing the sludge deposited on the substrate material layer from which the acid mine drainage is removed, and draining the sludge wash water Separating and collecting the cleaned sludge with the washing water by operating the sludge washing water outlet, the operating zone selective gate and the sludge washing water discharge gate, and inspecting or replacing the sludge-removed operating zone and repairing or replacing the damaged reaction block; Inflow of acid mine drainage into the operation area is completed by the operation of each hydro Characterized by comprising the step of resuming the former.

In the sludge post-treatment method of the natural purification treatment plant of the present invention, the step of washing the sludge precipitated on the substrate material layer, the step of collecting the washed sludge separately from the wash water, by mixing and stirring by adding a flocculant to the collected sludge Forming a floc and injecting the sludge dehydrator, filtering the contaminated water flowing out of the sludge dehydrator with a desorption filtrate and discharging it, compressing the dewatered sludge in the form of a cake and transferring it to a storage device. Characterized in that it comprises a.

According to the present invention as described above, according to the standard standardized design in advance, the standard production system of the factory, the quality is controlled, and by applying the reaction block with a perforated plate in the upper and lower parts, water permeability due to non-uniformity of the reactant layer It is possible to prevent problems such as defects and consequent flow channel concentration, loss and damage of the material inside the reactant layer, and instability of alkali supply due to them, which improves purification efficiency and durability, and configures according to the degree of pollution load. Since components and blending ratios consist of standardized reaction blocks, it is also possible to easily cope with variations in contamination loads.

On the other hand, the reaction block, the reaction material layer module is configured to be mounted on the support of the frame to a predetermined size suitable for replacement, and the purification reaction tank to a plurality of operating zones that can independently control the supply and blocking of acid mine drainage. As it is separated, it is possible to perform selective maintenance such as sludge collection in the selected operating area, inspection and replacement of the reaction block even during operation of the purification treatment facility, and the collected high concentration sludge is simultaneously treated with dehydration treatment and filtration of the desorption filtrate. It is also possible to prevent secondary contamination due to transportation and loss.

As described above, the present invention, in the acid mine drainage natural purification treatment facilities, it is possible to facilitate maintenance and maintenance at low cost with improved purification efficiency, improved operation stability, durability and improved response to pollution load fluctuations. The present invention relates to an acid mine drainage natural purification treatment facility, a maintenance method, and a post-treatment method of sludge, which enable effective post-treatment of sludge inevitably generated in natural purification treatment.

1 is a plan view of the installation of the acid mine drainage natural purification treatment facilities according to the present invention
Figure 1 (a) is a top plan view of the installation of the acid mine drainage natural purification treatment facilities according to the present invention
Figure 1 (b) is a bottom plan view of the installation of the acid mine drainage natural purification treatment facilities according to the present invention
Figure 2 is an inlet side cross-sectional view according to the present invention (AA 'cross-sectional view of the installation plan)
Figure 3 is a side cross-sectional view of the reaction cell unit according to the present invention (BB 'sectional view of the installation plan)
Figure 4 is a side cross-sectional view of the outlet according to the present invention (CC 'cross-sectional view of the installation plan view)
Figure 5 is a side cross-sectional view of the sludge washing water discharge unit according to the present invention (DD 'cross-sectional view of the installation plan)
6 is a block diagram of a substrate material reaction block and an alkali feed material reaction block according to the present invention;
Figure 6 (a) is a block diagram of a substrate material reaction block according to the present invention
Figure 6 (b) is a block diagram of an alkali feed material reaction block according to the present invention
7 is a cross-sectional view of the configuration of the reaction cell unit according to the present invention
Figure 7 (a) is a cross section of the reaction cell unit according to the present invention
Figure 7 (b) is a longitudinal section of the reaction cell unit according to the present invention
8 is a block diagram of a mobile dehydration and filtration apparatus according to the present invention
9 is a mobile dehydration and filtration apparatus according to the present invention

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms including ordinal, such as second, first, etc., may be used to describe various elements, but the elements are not limited to these terms.

The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

When a component is referred to as being "connected" or "connected" to another component, it may be directly connected to or connected to that other component, but it may be understood that other components may be present in between. Should be. On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

As the inventive concept allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail.

In the following description, numerous specific details are shown, such as specific components, which are provided to aid a more general understanding of the invention, and the invention may be practiced without these specific details. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

Acid mine drainage natural purification treatment plant of the present invention, as shown in Figure 1 is largely composed of the inlet 100, the reaction cell 200, the outlet 300, sludge washing water discharge 400.

The inlet 100 is to distribute the acid mine drainage flowing through the inlet sluice 110 to the upper portion of the reaction cell, the operation zone by the hydrology of the operation zone selection gate 120 and the reaction cell inlet 130 It is configured to select the supply and blocking of acid mine drainage, and shows the side cross-sectional view of the inlet of FIG.

Reaction cell unit 200, the acid mine drainage layer 210 to maintain a constant level from the top, as shown in the reaction cell unit side cross-sectional view of Figure 3, the substrate material layer 220 and the organic material filled with limestone or limestone and It is a top-down purification reactor composed of an alkali feed material layer 230 filled with a mixture of limestone, a reactant layer in which a natural purification process of acid mine drainage proceeds, and an effluent layer 240 in which purified water is collected.

The outlet part 300 is connected to the outlet water layer 240 at the bottom of the reaction cell part 200 and the reaction cell outlet 330 therebetween, and the purified water while controlling the level of the entire purification reaction tank with the water level control effluent gate 310. It is a structure for discharging, it is provided to the operating zone selection gate 320 is configured to control the discharge and the level of the purified water for each operating zone, it shows a side cross-sectional view of the reaction cell of FIG.

The sludge wash water discharge unit 400 is located at the upper portion of the outlet 300 as shown in the sludge wash water discharge unit side cross-sectional view of FIG. 5, and is connected to the sludge wash water discharge port 410 side of the reaction cell unit 200. It is configured to separate and collect only the washing water used in the washing step before collecting the sludge settled on the upper part of the material layer 220 to be discharged through the sludge washing water discharge water gate 420, and the operating zone selection gate 420. It is possible to collect and discharge the sludge washing water for each operating area.

Acid mine drainage layer 210 of the reaction cell unit 200 according to the present invention is basically operated to maintain the height of about 12m in an anaerobic state, the substrate material layer 220 is located under the various nutrients, oak Depending on the organic materials, such as waste wood, sawdust, crests, mushroom compost, and mixed at various ratios and filled to about 0.51.0m height, the alkali supply material layer 230 located below the mixture of organic materials and limestone in a predetermined ratio Is filled to a height of about 0.51.0m.

The substrate material layer 220 collects metal sulfides by reduction of heavy metals by sulfate reducing bacteria, maintains anaerobic conditions by supplying a stable organic material to the alkali supply material layer 230, and an alkali supply material layer thereunder. In 230, the limestone layer is continuously dissolved in an anaerobic atmosphere in which dissolved oxygen is removed to generate alkali to remove heavy metals with hydroxides, and at the same time, neutralize acid mine drainage.

As described above, the substrate material layer 220 and the alkali supply material layer 230 play a key role in purifying the acid mine drainage, but in the case of the prior art, mixed in arbitrary proportions based on organic materials that are readily available in the field. In most cases, the substrate material layer 220 is non-uniformly constructed, and thus, the permeability is deteriorated and the flow path is concentrated so that the substrate material layer 220 and the alkali supply material layer 230 are formed. Purification efficiency is rapidly lowered due to loss or loss of reactive material layer, poor maintenance of anaerobic state, alkali supply instability, and the like. The precipitation of hydroxides and the like deteriorates permeability and condensation of the flow path. This situation is not.

In the acid mine drainage natural purification treatment plant of the present invention, the substrate material layer 220 and the alkali supply material layer 230 are respectively referred to as the substrate material reaction block 221 and the alkali supply material, considering the above problems of the prior art. It consisted of the arrangement of the reaction block 231.

The substrate material reaction block 221 and the alkali supply material reaction block 231 of the present invention are modularized into units of reaction blocks 221 and 231 of a predetermined size suitable for installation and replacement as shown in FIG. Mounted in the cell frame 250, each reaction block (221, 231) of the module is standardized and standardized based on a preliminary applicability test, the component and compounding ratio, the standard production system of the factory, not on-site production Reaction blocks (221, 231) are selected to vary the composition and blending ratio according to the acid mine drainage pollution load of the site, and if the pollution load of the site fluctuates It is possible to respond by replacing with 221 and 231.

7 is a cross-sectional view of the reaction cell unit 220 in which the substrate material reaction block 221 and the alkali feed material reaction block 231 according to the present invention are mounted, and each reaction block 221 having a predetermined size suitable for installation and replacement. , 231 is mounted on the reaction cell frame 250 is provided with a reaction block support structure, at this time, the top surface of the reaction block layer is arranged mounted to the reaction block (221, 231) is inclined of about 3 ~ 10 degrees It is installed to have, it is installed to facilitate the collection of sludge deposited on the upper surface of the substrate material reaction block layer.

The reaction cell unit 200 including the acid mine drainage layer 210, the substrate material layer 220, and the alkali supply material layer 230 extends to the acid mine drainage inlet 100 and the outlet 300. A plurality of reaction cell frames 250 are installed to form the reaction cell channel 260.

As shown in FIG. 5, each reaction cell channel 260 is provided with a reaction cell inlet 130 above the boundary with the inlet 100, and a reaction cell outlet 330 below the boundary with the outlet 300. It is provided, the sludge washing water outlet 410 is provided on the upper boundary with the sludge washing water discharge unit 400, and also as shown in Figure 7 the height of the reaction cell frame 250 to be soaked inside the acid mine drainage layer 210 The acid mine drainage layer 210 of each reaction cell channel 260 is installed so that the water level is always constant. However, the acid mine drainage layer 210 is projected to the upper portion of the acid mine drainage layer 210 so that the acidic drainage layer 210 is supplied to each reaction cell channel 260. And it is also possible to control the blocking.

In the acid mine drainage natural purification treatment facility of the present invention, as shown in FIG. 1, the operation area 500 independently controlled to supply and block the mine drainage is blocked without blocking the acid mine drainage of the entire purification treatment facility. The first driving zone, the second driving zone, and the like are set.

The reaction cell unit 200 is separated from the flow path of the acid mine drainage by the operation zone frame 510, and each operation zone is the operation zone selection gate 120 and the reaction cell inlet of the inlet 100 of the acid mine drainage ( 130) can independently block the inflow of acid mine drainage, the operation region frame 510, unlike the reaction cell frame, the height of the frame protrudes to the top of the acid mine drainage layer, independent of the acid mine drainage Has the function of separating.

The operation of the reaction cell outlet 330 of the outlet 300 and the operation zone selective gate 120 may discharge the purified water in the operation zone and control the water level, and the sludge washing water outlet 410 of the sludge washing water discharge unit 400. ) And only the washing water used in the step of washing the precipitated sludge on the substrate material layer 220 of each driving zone by the operation of the operating zone selection gate 420 is discharged through the sludge washing water discharge gate 420. It is possible to perform the cleaning and collection of the sludge deposited on the substrate material layer 220, the separate intake and discharge of the washing water, maintenance, such as inspection, repair and replacement of each reaction block (221, 231) for each operating area unit Not much can be done.

In the maintenance method of the acid mine drainage natural purification treatment facility of the present invention as described above, selecting a driving zone for maintenance and repair, the operation zone selection gate 120 and the reaction cell inlet 130 of the inlet 100 Step of blocking the inflow of acid mine drainage by the hydrological operation of the reaction cell part of the reaction cell outlet (330), the operation zone selection gate 320 and the water level control outflow gate 310 of the outlet 300 Lowering the water level of 200, the step of washing the sludge precipitated on the substrate material layer 220 from which the acid mine drainage is removed, the sludge washing water outlet 410 of the sludge washing water discharge unit 400, the operating zone selection gate ( 420) and separating and collecting the washed sludge with the washing water by operating the sludge washing water discharge gate 430, and inspecting or replacing the damaged reaction blocks (221, 231) of the operating area in which the sludge is removed. , Each of the above The operation is resumed by introducing an acid mine drainage into the operation area where the maintenance is completed by the operation.

After treatment of the sludge produced from the natural purification treatment plant of the present invention, as shown in Figure 8, the sludge drawing pump 610, flocculant stirring equipment 620, sludge dehydrator 630 filter feed pump 640 and desorption filtrate filter The sludge dewatering and filtration device 600 including 650 may be processed, and the sludge dewatering and filtration device as shown in FIG.

In the sludge aftertreatment method of the natural purification treatment facility of the present invention, the step of washing the sludge precipitated on the substrate material layer 220, the step of collecting the washed sludge separated from the washing water, by adding a flocculant to the collected sludge Mixing and stirring to form floc and injecting into the sludge dehydrator, filtering the contaminated water flowing out of the sludge dehydrator with a desorption filtrate and discharging the dewatered sludge to form a cake Compression is carried out to the storage device.

100: inlet
110: inflow sluice
120: Selected gate for driving zone
130: reaction cell inlet
200: reaction cell part
210: acid mine drainage layer
220: substrate material layer
221: substrate material reaction block
222: Substrate Substance
223: upper and lower perforation network of substrate material reaction block
230: alkali feed material layer
231: alkali feed material reaction block
232: alkali feed material
233: upper and lower perforation network of alkali feed material reaction block
240: purified water effluent layer
250: reaction cell frame
260: reaction cell channel
300: outlet
310: water level control
320: Selected gate for driving zone
330: reaction cell outlet
400: sludge washing water discharge part
410: sludge washing water outlet
420: Selected gate for driving zone
430: sludge washing water discharge gate
500: driving area
510: driving area frame
520: first operating area
530: second operation area
600: sludge dewatering and filtration device
610: Sludge Drawing Pump
620: flocculant stirring equipment
630: sludge dehydrator
640: strainer feed pump
650: Tally filtrate filter

Claims (11)

An inlet having a passage through which an acidic mine drainage is introduced to distribute the upper portion of the reaction tank;
A reaction cell portion comprising an acid mine drainage layer maintaining a constant water level, a substrate material layer filled with an organic material, an alkali feed material layer filled with limestone or a mixture of organic material and limestone, and an effluent layer of purified acid mine drainage;
An outlet having a water level control gate; And
Sludge washing water discharge;
Acid mine drainage natural purification treatment facility comprising a. According to claim 1, The substrate material layer and the alkali supply material layer, based on the results of the prior applicability test, the component and the blending ratio is standardized according to the contamination load, modularized to a predetermined size suitable for replacement Acid mine drainage natural purification treatment plant, characterized in that consisting of an array of reaction blocks. The method of claim 2, wherein the reaction block,
The acid mine drainage natural purification treatment facility, characterized in that the upper surface of each reactant layer consisting of an array of each reaction block is installed to have a slope of 3 to 10 degrees. The method of claim 3, wherein the reaction block,
An acid mine drainage natural purification treatment facility, characterized in that the upper and lower portions of each reaction block is provided with a porous plate or a porous plate of the mesh structure. The method of claim 4, wherein the reaction block,
The acid mine drainage natural purification treatment facility, characterized in that it has a reaction cell frame provided with a support for supporting the reaction block. The method of claim 1, wherein the reaction cell unit,
An acid mine drainage treatment system characterized in that it comprises a plurality of reaction cell channels, which are divided into a reaction cell frame and formed of a substrate material reaction block and an alkali feed material reaction block. The method of claim 6, wherein the reaction cell unit,
An acid mine drainage natural purification treatment facility, characterized in that it has an operating zone frame that separates the acid mine drainage to form an acid mine drainage layer that is independently separated. Operation zone selection gate and reaction cell inlet for inlet to select and shut off the acid mine drainage by operation zone independently;
A driving zone frame of the reaction cell unit separating the flow path of the acid mine drainage into an independent driving zone;
Equipped with a reaction cell outlet, an outlet of the operating zone, a selective gate and a water level control outlet, which can independently discharge the purified water in the driving zone and control the water level.
The acid mine drainage treatment system characterized in that it comprises a plurality of operation zones independent of the supply and blocking of the acid mine drainage by the operation of the reaction cell outlet, the operation zone selection gate and the water level control outflow gate. The method of claim 8, wherein the driving zone,
Sludge wash water outlet of the sludge wash water outlet, the operating zone selection gate and the sludge wash water discharge gate to enable the sludge wash water on the substrate material layer to be separated and collected by the operating zone and discharged through the sludge wash water discharge gate. Mine drainage natural purification treatment facility. Selecting an operation zone for maintenance, blocking the inflow of acid mine drainage by the operation zone selection gate of the inlet and the reaction cell inlet, the reaction cell outlet of the outlet, the operation zone selection gate and the water level control effluent Lowering the water level of the reaction cell by hydrological operation of the door, washing the sludge deposited on top of the substrate material layer from which the acid mine drainage is removed, operating the sludge washing water outlet of the sludge washing water outlet, selecting the operating zone and the sludge washing water discharge water gate Separating and collecting the washed sludge with the washing water, inspecting the operating area in which the sludge has been removed, and repairing or replacing the damaged reaction block, and acid mine drainage to the operating area in which the maintenance is completed by the operation of the respective hydrological gates. Acid mines comprising the step of restarting the operation by introducing the How can maintain a natural purification treatment facilities. The method of claim 10,
In the step of separating and collecting the washed sludge with the washing water, a flocculant is added to the collected sludge to be mixed and stirred to form a floc and injected into the sludge dehydrator, and the contaminated water flowing out of the sludge dehydrator is desorbed into the filtrate. Filtering and discharging, compressing the dewatered sludge in the form of a cake and transporting the sludge to a storage device.

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