KR100693809B1 - The system and method about neutralization of water and stabilization of soil using alkalinity liner when making a pile the muck which has the pyrite - Google Patents

Abstract

A structure and a method which adjust pH of the muck pile and remove heavy metals from the muck pile and neutralize water of a mounding part by preventing acidification of the muck pile using slacked lime as a natural alkalinity agent when piling a muck pile containing pyrite, and block inflow of underground water or outflow of leachate and prevent environmental pollution due to acid mine drainage by installing an alkaline liner in a pyrite-piling part are provided. A structure for neutralization of water and stabilization of soil using an alkaline liner when piling a muck pile containing pyrite comprises: a culvert perforated pipe(1) installed in certain parts of a section in which a pyrite-muck pile is formed such that the culvert perforated pipe collects penetrated water; a pond and monitoring catchment well(2) installed at ends of both slopes of a pyrite mounding part; a mounding incline plane(3) formed by spreading earth and sand on the both slopes of the pyrite mounding part and hardening the earth and sand; a first neutralization layer installed under the pyrite mounding part; a second neutralization layer formed on an inner side of a side-piling part of the mounding incline plane; a pyrite-muck layer formed to a predetermined elevation on the pyrite mounting part; an alkaline liner(6) with a predetermined thickness laid down on an upper surface of the pyrite-muck layer; and a roadbed and pavement layer formed on an upper part of the alkaline liner.

Description

System and method about neutralization of water and stabilization of soil using alkalinity liner when making a pile the muck which has the pyrite}

1 is a flow chart for stabilizing a pumice-containing dark rock using an alkaline water repellent agent according to the present invention.

2 to 9 is a step-by-step construction diagram for filling the rock containing the pyrite according to the present invention,

Figure 2 is a cross-sectional view of installing a blind hole hole in the end portion of the fill section in accordance with the present invention.

Figure 3 is a cross-sectional view of the landfill both sides of the slope in accordance with the present invention is installed in the monitoring sump to collect the water drained into the blind hole perforated pipe in FIG. 2 and the pond to collect the water drained from the sump.

Figure 4 is a cross-sectional view showing a section for forming and tosa by laying and sanding the soil on both sides of the fill portion according to the present invention.

FIG. 5 is a cross-sectional view of a layer of 50 mm or less of limestone (Limeston) mixed with high quality soil to prevent groundwater from flowing into the upper part due to the rise of groundwater in the fill part according to the present invention; FIG.

Figure 6 is a cross-sectional view of installing limestone on the inner slope and pyrite installation to prevent damage caused by acidic water leakage inside the slope of both sides before the pyrite laying in the fill portion according to the present invention.

Figure 7 is a cross-sectional view of installing a high-grade soil and slaked lime on the pyrite fillet according to the present invention to install the order layer.

Figure 8 is a cross-sectional view showing the structure of the road completed by repeating the first process up to the top surface of the furnace by applying the fill method according to the present invention.

Figure 9 is a cross-sectional view showing a step-by-step filling method by section in the filling method according to the present invention.

* Explanation of symbols for main parts of the drawings

1: blind man melee 2 Pond and monitoring sump

3: Filled surface 4: Limestone and soil mixed layer

5: limestone

6: order layer mixed with high quality earth and lime

The present invention relates to a method for treating a dark buff containing pyrite, and more particularly, to block the contact of water and air at the time of stacking a dark buff containing pyrite (Pyrite). In case of pyrite reacting with water due to the inflow of groundwater, acid and drainage are prevented by using natural alkali agent (crushed limestone or hydrated lime) with the ability of ordering to remove pH and heavy metals. The present invention relates to an apparatus and a method for stabilizing runoff and soil in a fill section.

In general, methods for treating blast cancer include a landfill method, a solidification / insolubilization method, a separate landfill transfer method, a reuse method, and a solidification method.

The reclamation method is a method of constructing and reclaiming construction waste storage facilities such as retaining walls or soil embankments in the vicinity of a project area, and managing waste by carrying out various water repellents, covering and planting, if necessary. The landfill law is not a “clean up” concept, but a “Cover up” concept, which moves to soil, river water, and groundwater during the rainy season, which threatens the ecosystem of the surrounding area at all times. Economic burden, such as disposal costs.

The solidification / insolubilization method is a technique for chemically treating blasted rock waste to dislodge the elutable harmful components present in the rock and stabilize the harmful components and then build a tailings storage facility as in a landfill method. The solidification / insolubilization method has a disadvantage in that construction costs are high. In Korea, there is no record of waste treatment with this technology.

A separate landfill move plan is to move the waste itself separately to a nearby area or to a specific waste landfill, which is possible for small-scale waste. However, in the case of a large amount of waste, it is very difficult to move on a large scale, and thus there is a limit to apply it, and in the process, it may also cause another complaint problem due to land use.

The reuse method is to reduce the contact with the oxygen as much as possible to use the burying bag taken to the outside as a fill material of the road. As the landfill material, the order layer should be placed in the landfill in consideration of the external stormwater and the rise of the groundwater level. In addition, it is possible to reduce the possibility of acid generation in the parts with toxic components in the blasting rock, and can be directly used as a fill material for rocks without harmful components.

The solidification method is a method of physically fixing contaminants in a solid structure and chemically stabilizing by mixing waste or red mud with solid materials. The solidification method aims to prevent environmental pollution by organic wastes and to improve the handling of hazardous wastes.The solidification treatment for the prevention of environmental pollution involves the removal of groundwater or soil through heavy media such as It is made harmless or difficult to dissolve to prevent contamination. Due to the solidification treatment, the harmful components have a very slow flow rate to the natural world, and the possibility of environmental pollution is lowered. However, the solidified material has a disadvantage that the treatment cost or transportation cost increases due to the increase in volume.

However, these treatments are only temporary measures to minimize the reaction rate, and they cannot fundamentally block the inflow of groundwater and leachate, and the environmental damage that can occur from acidic water and heavy metal spills due to the reaction of pyrite with water. There is a drawback of not being able to cope more aggressively. Therefore, a construction method is required.

Therefore, the present invention has been proposed to solve the above problems, the primary blockage of contact with water and air during the stacking of pyrite-containing rock blocks, acidic leachate due to rainwater and groundwater inflow In order to prevent the occurrence of acid by using a natural alkali agent (calcified lime) having a degree of order to prevent acidification in advance, it provides a soil stabilization device and method that can remove the pH and heavy metals and neutralize the runoff of the fill There is a purpose.

In addition, the present invention can be used as a material for stacking a rock containing pyrite (pyrite) by installing an alkaline water repellent in the pyrite stacking, the inflow of groundwater during the stacking of a rock containing pyrite (pyrite) Alkaline water-repellent agent that blocks the outflow of water and leachate, and prevents the environmental damage that can contaminate the surrounding area from acid drainage caused by reaction with water due to penetration of pyrite stack. Another purpose is to provide an apparatus and method for neutralizing the effluent and stabilizing the soil.

The present invention for achieving the above object, the first step of investigating the presence or absence of environmental damage to the surrounding road of the area to be cut due to the tunnel or new road; A second step of inspecting the presence of substances harmful to the human body by conducting a pH and component analysis by collecting soil or rock in the area when the environmental damage was detected in the first step; When it is determined that there is a harmful substance in the second step, the soil or exposed rock is collected, and the pH and heavy metal concentration change are measured by the long-term dissolution test, and the pH of the solution is three steps of measuring the pH change; The alkaline water-ordering agent is installed around the fill area during the filling of the pyrite rock, and the pyrite rock and the alkaline water-loading agent loaded in the fill area are alternately stacked to obtain an acid drainage that can flow out of the pyrite rock. A fourth step of ordering and neutralizing to stabilize; A fifth step of monitoring for continuous maintenance after completion of the fill layer of pyrite rock; And neutralization of the effluent using alkaline water repellents and soil during stacking of pyrite containing pyrite comprising a sixth step of installing a hearth on the upper part of the furnace body after stabilization of pyrite rock and finishing the pavement layer thereon. Provides a stabilization method.

In addition, the present invention is a blind pit perforated tube installed to collect the infiltration water for each predetermined portion of the section of the pyrite rock pile; Pond and monitoring water collection wells installed on both sides of the slopes of the pyrites to collect and process the water flowing from the blind pit hole; A filling method surface formed by laying soil on both sides of the pyrite filling portion and compacting the soil; A first neutralization layer disposed below the pyrite fill in order to neutralize a reaction between the leachate and the pyrite flowing into the basement; A second neutralization layer disposed on an inner side surface of the side stacking portion of the fill surface in order to neutralize the oxidation reaction of pyrite by rainfall or the like that can penetrate the fill surface; A pyrite rock block subtracted to a predetermined height in the fill portion; An alkaline order layer having a predetermined thickness disposed on an upper surface of the pyrite rock layer; And a roadbed and a paving layer laid on top of the alkaline order layer, wherein the pyrite rock layer and the alkaline order layer contain pyrite that is repeatedly performed until reaching a certain height. It provides neutralization of effluent using alkaline water repellent and stabilization of soil in dark pile.

Hereinafter, with reference to the accompanying Figures 1 to 9 will be described in detail a preferred embodiment of the present invention.

Neutralization of effluent using alkaline water repellent and stabilization of soil in accordance with the present invention in order to exclude the possibility of pH drop and the possibility of some heavy metal spill due to the outflow of acid drainage generated by the reaction of pyrite (Pyrite) with water It is based on neutralizing acidic water and treating heavy metals and blocking or insolubilizing the outflow of acid mine drainage (AMD) by pyrite.

In the embodiment of the present invention to remove the pH and heavy metals, the pre-installation step, the construction step and the post-installation step as shown in Figure 1 performs the overall process.

First, as a pre-construction step, the first step of investigating the presence or absence of past environmental damage such as roads or seoksan in the area where tunnels or incisions are to be generated due to the occurrence of new roads before construction starts. When the environmental damage occurred in the first step, the soil or rocks of the area were collected, and the pH and ingredient analysis were conducted along with the design boring data and samples that were carried out to design the road route. Perform a second step to investigate. When it is determined in step 2 that there is a harmful substance, the third step of selecting a proper treatment method by collecting soil or exposed rock in the surroundings is performed. At this time, the titration method of step 3 is to measure the pH and heavy metal concentration change by the long-term dissolution test on the collected soil or rock, and by measuring the pH change of the soil or rock block while fixing the pH of the solution The treatment method should be selected. As a treatment method of pyrite present in the embodiment of the present invention is a method of blocking the neutralization of acid and alkali metal outflow of the alkali using an alkali agent. Commonly known alkaline agents include lime, such as slaked lime, quicklime, limestone, and by-products such as slag, by-lime lime, red mud, and bouxol powder.

Here, the red mud (Rud Mud) which is the alkaline by-product will be described in more detail.

The red mud is a byproduct generated in the process of producing aluminum hydroxide or alumina as bauxite ore, and is used to neutralize acid drainage and stabilize heavy metals. The red mud has a high alkalinity and acts as a flocculant to neutralize acids and adsorb toxic heavy metal elements so that they do not dissociate. Typically, the acid neutralization capacity of the red mud is 3.5 to 7.5 moles of acid / kg, and when the acidity of the pore water is 5 or less, the acid can be neutralized to about 14 to 20 moles / kg.

Alkaline selection requirements for the pyrite treatment presented in the present invention is first, the purpose is to neutralize the acid, high alkalinity of pH 10 or more is essential, the permeability coefficient of about 1 × 10 ^-6 cm / sec to act as the order It must be a particulate to maintain. Second, it should be a product using natural materials that do not cause secondary pollutants such as heavy metals. Third, the product should be economical in consideration of the amount of alkaline agent to be applied to the construction section.

The product satisfying all the above requirements was determined by calcination, and based on this, the experiment of dark buckling treatment using alkaline water repellent was conducted to determine the optimum requirement and proper treatment method in the field.

Hereinafter, the steps during construction will be described in detail with reference to FIGS. 2 to 9.

2 to 9 is an exemplary view for explaining the construction process as a construction diagram for the pyrite filling method.

That is, in the landfill method of the road using the alkaline water-based agent of the present invention, as shown in FIG. 2, the blind section hole installation pipe section on both sides of the landfill part performs a certain amount of general embankment up to 1m or more of the groundwater level. Then, in order to collect the permeate water at both ends and the predetermined section of the bottom of the pyrite fillet is installed a blind rock perforated pipe (1) of acid-resistant material having a diameter of 300mm. The blind pit hole (1) is for long-term monitoring and measurement of acid drainage and heavy metal outflow that may occur due to rainfall or groundwater after the road structure is completed. The filling material around the Maenggamger perforated pipe 1 is filled with limestone (particle diameter: 25 mm), which is an alkaline agent, for smooth drainage and neutralization of acidic drainage.

As shown in FIG. 3, a pond and a monitoring water collecting well 2 are installed at both end portions of both slopes of the fill section for collecting and treating the water flowing in the blind pit hole 1.

The pond and monitoring water collection well (2) is a facility for collecting and draining the water drained from the blind pit hole 1 and discharged to the pond, to monitor the water quality by collecting water in the water well and the pond It is for. That is, in the pond, the water quality is measured before the final discharge, and serves to discharge it by maintaining it in a stabilized state, which is installed for the prediction and response to environmental damage later. The role of the monitoring collection well (2) is to measure the water quality of the water drained through the blind and under construction at each installation site, and do not react directly to the rain on the front of the fill part when the pH due to rainfall during construction changes suddenly. Use a tent to protect it. The pond is a place where the water collected in each sump collects before finally discharged, and measures the pH change and the water quality before discharge and discharges it when determined to be appropriate. If the pH deviates from the management standard during the monitoring survey in the sump, neutralize the lime by adding limestone (when generating acidic water) or aluminum sulfate (when generating alkaline water), depending on the pH concentration. The monitoring cycle measures the pH of the water collected in the sump and pond during the rainy season, and during the dry season, a regular water quality test is conducted once a month.

Next, as shown in FIG. 4, the earth and sand are installed on both sides of the pyrite fillet and the compaction is performed to install the filling method.

The sediment laying on both sides of the embankment is an index for the pyrite sediment section, and the construction method is to perform the slopes on both sides of the construction site for the pyrite laying section first in the form of tosa dike. In this section, the road construction management standards for road construction are applied, and the control method is applied by applying the K ₃₀ = 150 N / cm3 or more at the compaction density of 95% and the flat load test settlement of 0.125mm.

As shown in FIG. 5, in the fill part, 50 m or less of limestone (Limestone) and a high quality earth and sand mixed layer 4 are prepared to neutralize the leachate which can be introduced from the basement and react with the pyrite.

The installation of the alkaline water repellent using limestone and high quality soils serves as a water repellent to prevent leachate from occurring due to the rise of groundwater, and is installed on the entire surface of the pyrite construction. It is the first stabilization method to neutralize when a small amount of leachate is generated due to the rise of groundwater, which causes acidic drainage in the reaction with pyrite. In this case as well, the construction management standard shall be managed by applying K ₃₀ = 150N / cm3 or more at 95% compaction density, flat load test settlement amount of 0.125mm, which is the road management standard for road construction.

On the inner side of the fill surface side stacking portion, as shown in Fig. 6, in order to neutralize the oxidation reaction of pyrite by rain, which can penetrate into the fill surface, the limestone 5 is laid and finished, and the pyrite rock 2 layers of dark soil 1 layer and 2 layers by 60cm.

That is, in the pyrite stacking layer, a small amount of leachate is generated from the surface of both inner side compaction parts before stacking the pyrite, and this leachate reacts with the pyrite to neutralize the acidic drainage that can be leaked. Construct in cm thickness. The construction method of the pyrite rock block layer installed on the limestone (Limestone) and the high quality soil mixture layer 4 is carried out step by step soil laying soil 60cm each step and laid two steps.

The construction management standard applies the K ₃₀ = 200N / cm3 or more at 0.125mm of flat load test settlement, and afterwards, the work plan should be thoroughly completed to finish with alkaline water repellent when daily work is completed.

Next, as shown in FIG. 7, the top of the pyrite site exposed to 20cm thickness of the order layer 6 mixed with high quality earth and sand and slaked lime, which serve as an alkaline order agent, after the construction of the two-stage clay pyrite rock block. To be installed in. This is a method of stabilizing pyrite and showing a cross section protecting the entire surface of the fill part with an alkaline order agent in order to minimize the reaction with pyrite from a small amount of penetrating water.

At this time, the construction management standard of the alkaline water repellent layer is controlled by applying K ₃₀ = 100N / cm3 or more at 90% compaction density, which is the management standard of road body during road construction, and the settlement load of flat plate test at 0.125mm.

Finally, as shown in FIG. 8, in order to minimize the adverse effects of leachate caused by groundwater or rainfall, the process of forming the soil surface, applying the limestone to the inner surface of the soil surface, and laying the alkaline order layer after loading the pyrite rock are prescribed a predetermined number of times. Repeat as many times to complete one road structure.

The finished section of the fill structure is constructed from the bottom of the furnace body to 60 cm or more from the bottom of the furnace body, and then to the final body of the furnace body in the same manner as the general soil, and the top layer of the furnace body is 1m thick. Afterwards, the pavement layer and pavement are carried out, which plays a primary role in blocking leachate that can penetrate due to rainfall.

9 is a cross-sectional view of the fill section by section / step.

Finally, at the post-construction stage, water samples are periodically collected from the pond and monitoring basin once a month.

In other words, for continuous maintenance after the completion of the fill layer, the water wells, ponds, and nearby rivers are monitored by conducting regular water quality inspections once a month for a certain period of time.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, conversions, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

      As described above, according to the present invention, if it is determined that environmental damage may occur by performing a preliminary investigation on the cancer buckles to be buried in the road structure, by applying the present invention, harmful heavy metals that can be generated during and after construction are constructed. And it has the effect of blocking the environmental damage caused by acidic drainage.

Claims (9)

delete A first step of investigating past environmental damages on the roads around the area where the incision is to be made due to the tunnel or the new road; A second step of inspecting the presence of substances harmful to the human body by conducting a pH and component analysis by collecting soil or rock in the area when the environmental damage was detected in the first step; When it is determined that there is a harmful substance in the second step, the soil or exposed rock is collected, and the pH and heavy metal concentration change are measured by the long-term dissolution test, and the pH of the solution is three steps of measuring the pH change; The alkaline water-ordering agent is installed around the fill area during the filling of the pyrite rock, and the pyrite rock and the alkaline water-loading agent loaded in the fill area are alternately stacked to obtain an acid drainage that can flow out of the pyrite rock. A fourth step of installing and finishing the hearth on the upper part of the furnace body after stabilization by ordering and neutralizing; And The fifth step of monitoring for continuous maintenance after the fill layer of pyrite rock Including but not limited to: The fourth step is A first step of installing acid-resistant blind hole pipes for collecting infiltration water at both ends of the bottom surface of the pyrite; A second process of installing a pond and a monitoring water collecting well at both end portions of both slopes of the landfill part to collect and process water flowing from the blind rock perforated pipe installed in the pyrite site; A third process of laying soil on both sides of the pyrite pile and forming a fill method; A fourth step of installing a limestone and a high quality earth and sand mixed layer below the pyrite fillet to neutralize a reaction between the leachate and the pyrite flowing into the basement; A fifth process of coating and finishing with a limestone layer on the inner surface of the side stacking portion of the embankment method in order to neutralize the oxidation reaction of pyrite by rain, which can penetrate into the embankment after the third process; A sixth step of loading the pyrite rock block layer at an arbitrary height in the fill section; A seventh step of forming a degree layer by mixing high quality soil and slaked lime, which serve as alkaline ordering agents, after construction of the pyrite rock layer; And an eighth process of repeating the third, fifth, and seventh processes until a certain height is reached in order to minimize adverse effects of leachate caused by groundwater or rainfall. Neutralization of effluent and alkaline stabilization method using an alkaline water repellent during stacking containing a pyrite (Pyrite) containing. The method of claim 2, Neutralization of effluent and alkaline soil stabilization method using alkaline water-based salt when stacking pyrite containing pyrite (Pyrite), characterized in that the alkaline water-based agent is hydrated lime. Maengamger's Yugong-guk installed to collect infiltration water for every predetermined part of the section where the pyrite rock was filled; Pond and monitoring water collection wells installed on both sides of the slopes of the pyrites to collect and process the water flowing from the blind pit hole; A filling method surface formed by laying soil on both sides of the pyrite filling portion and compacting the soil; A first neutralization layer disposed below the pyrite fill in order to neutralize a reaction between the leachate and the pyrite flowing into the basement; A second neutralization layer disposed on the inner side surface of the side stacking portion of the fill surface in order to neutralize the oxidation reaction of pyrite by rain or the like that can penetrate the fill surface; A pyrite rock block subtracted to a predetermined height in the fill portion; An alkaline order layer having a predetermined thickness disposed on an upper surface of the pyrite rock layer; And The hearth and pavement layer which is laid on top of the alkaline order layer and finished Including, Neutralization of soil and stabilization of the effluent using an alkaline water repellent during stacking of the pyrite containing pyrite (Pyrite), characterized in that the pyrite bitumen rock layer and the alkaline order layer is alternately stacked a predetermined number of times. The method of claim 4, wherein Neutralization of the effluent using alkaline water repellent and soil stabilization device when stacking the dark rock containing pyrite (Pyrite), characterized in that the first neutralized layer is a mixed layer of limestone and soil. The method of claim 4 The second neutralization layer is neutralized effluent and alkaline soil stabilizer using an alkaline water repellent during stacking containing a pyrite (Pyrite), characterized in that consisting of limestone. The method of claim 4, wherein Neutralization of the effluent using alkaline water repellent and soil stabilization device when stacking the rock containing pyrite (Pyrite), characterized in that the alkaline order layer is a mixed layer of soil and slaked lime. The method of claim 4, wherein The first and second neutralization layer and the alkaline order layer is made of at least one selected from hydrated lime, quicklime, limestone, neutralization of the effluent using alkaline water repellent and the soil stabilization device when stacking the rock containing pyrite (Pyrite). The method of claim 4, wherein The first and second neutralization layer and the alkaline order layer is composed of a mixed layer mixed with at least one selected from hydrated lime, quicklime, limestone, slag, red mud, and sack and earth dust and alkaline tea during stacking of pyrite containing pyrite. Neutralization of runoff using soil and stabilization of soil.

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