KR101115053B1 - Method of constructing ground of landfill with derdged soil for tree planting - Google Patents

Abstract

PURPOSE: A constructing method of the ground from landfills with dredged soil for tree planting is provided to reduce the stabilization period for soft ground formed with the dredged soil. CONSTITUTION: A constructing method of the ground from landfills with dredged soil for tree planting comprises the following steps: digging the dredged soil from a reclaimed ground surface layer into the predetermined depth; spread a drainage layer material selected from gravels, wood chips, or a first soil improver on the dug up space to form a drainage layer; preparing a vegetating soil composition by mixing the dredged soil with a second soil improver, and installing the composition on the drainage layer to form a vegetation layer; planting trees on the vegetation layer; and sowing seeds on the vegetation layer for fixing the surface of the ground.

Description

Method of constructing ground of landfill with derdged soil for tree planting}

The present invention relates to a method for forming a tree growing ground of a dredged landfill, more specifically, the installation of a drainage layer, laying of a vegetation soil composition mixed with dredged soil and a soil improving agent, and planting of dredged soil, particularly under the sea The present invention relates to a method for stabilizing soft soils buried in dredged soil and creating tree growth grounds for plants to grow normally.

A landfill can be created by reclaiming the sea for the supply of new land required by economic development. There are two ways to form the paper through the seashore reclamation, in which the seawater is piled up in the sea, and the inside is reclaimed with soil collected from the ground, or the sand or the soil under the sea is reclaimed by dredged soil with pumps. . In the case of reclamation using soil collected from the ground, the introduction of natural vegetation is quicker and easier to establish planting ground for planting trees, but it is difficult to secure soil for reclamation and thereby destroy the natural environment. May cause problems. On the other hand, when the dredged soil is reclaimed, it is easy to reclaim the land, but since it is reclaimed using the dredged soil of the seabed, the salt is excessive and the sand content is higher than that of the soil of the soil, so the physical and chemical properties of the soil are not good, so the trees are planted directly. There are many problems with the introduction of natural vegetation. Among these physicochemical properties, physical conditions such as soil aeration and drainage, salt concentration, acidity (pH), electrical conductivity (EC), and nutrient deficiency may be major obstacles to plant growth.

Specifically, the subsea dredged soil has physical problems such as poor ventilation, poor drainage, and chemical problems such as strong alkalinity (pH), excessive salt temperature, and ion-containing (EC), which are inadequate for plant growth. If the soil is dredged by removing only the water without improving the dredged soil, the rainwater does not penetrate well into the soil due to the poor physical properties of the dredged soil and the drainage is not smooth. It takes a very long time for the ground to stabilize, and after several years, partial settlement occurs. In addition, in the vegetation aspect, the ground buried with dredged soil is difficult to expect normal growth of plants due to chemical problems such as strong alkalinity (pH), excessive salt temperature, and nutrient deficiency, as well as physical properties such as poor drainage. The reason for the poor physical properties of the dredged soil is that it is mostly silty or close to silt, so the spacing between particles is dense, and soil particles become hard-grained due to the action of sodium salt (Na ⁺ ion) dissolved in the soil. This is because they cannot be dispersed in single grain ends.

In this way, the soil in the landfill area with high acidity, low organic nutrient content, high salt and electrical conductivity, is not suitable for the growth of trees. Maintenance is required.

Conventional methods for creating planting grounds in coastal landfills include digging up the dredged soils for planting and moving them to other places, instead of filling them with landscaping soil and planting them at a height of 1-2 m above the dredged soils in the coastal landfills. There is a method to cover the land using landscaping, and then plant the landscaping. However, the above two methods of digging up dredged soil and replacing it with landscaping soil and raising the landscaping soil on dredged soil both have problems of increasing the cost of landscaping construction, and must damage the mountainous area in order to supply soil. However, it is becoming increasingly difficult to secure a pit and, as a result, large reclaimed land requires astronomical quantities, so it is being reclaimed with dredged soil rather than the traditional method of landfilling. Therefore, environmentally friendly and economical method of planting soil is required beyond the existing planting method for existing dredged landfills.

The present invention was derived to solve the conventional problems, shortening the stabilization period of the soft ground buried with dredged soil, and at the same time with the economical, practical, and environmentally friendly to enable plants to grow normally, It is to provide a method for arranging tree growing ground.

In order to solve the above object of the present invention, the present invention is to remove the dredged soil of the surface layer of the dredged landfill to a predetermined depth, and to install a drainage layer of any one selected from gravel, wood chips, or the first soil modifier. Forming a; Forming a vegetation layer by arranging a vegetation soil composition prepared by mixing dredged soil and a second soil modifier on the drainage layer or a vegetation soil composition formed by mixing a dredged soil, soil taken from an acid, and a second soil modifier; And planting trees in the vegetation layer. In this case, the first soil-improving agent is dissolved in at least one compound selected from the group consisting of calcium phosphate, ammonium phosphate, ammonium sulfate, potassium nitrate, calcium cyanide, ammonium nitrate, potassium sulfate, and manganese sulfate in the bark (Bark) The solution is electrodeposited or absorbed by spraying or dipping and semi-dried and then coated with at least one material selected from carbonate powder, vermiculite or sulfur powder. In addition, the second soil improving agent (a) 65 to 85% by weight of the granulation promoter including a calcium compound and a magnesium compound in a weight ratio of 3 to 5: 1, the weight of the iron compound and aluminum compound 6 to 8: 1 A group 1 improved substance comprising 1 to 6% by weight of a particle coagulant accelerator and 10 to 30% by weight of a soil coagulant comprising a silicon compound; and (b) oak, oak, oyster, oak bark or oak. Crushed, fully fermented organic matter of lumber, chestnut, oak, oak, birch, birch, 55-80% by weight, nitrogen compounds 3-18%, phosphoric acid compounds 3-25%, 2-7 wt% of girly compound, 0.3-0.5 wt% of sulfur compound, 0.5-1 wt% of molybdenum compound, 1-3 wt% of boron compound, 0.5-0.8 wt% of zinc compound, 0.5-1.0 wt% of manganese compound, copper compound 0.3-0.8 wt% and chlorine compounds 0.3-0 .5 weight percent of a group 2 modified material and (c) anabaena, anabaenopsis, dactylococcopsis, synechocystis and microcystis. 3 group improved materials.

In addition, the method for forming a tree growing ground of the dredged landfill according to the present invention preferably further comprises the step of planting the seed of the plant in the vegetation layer to fix the indicator of the dredged soil landfill; The step is arranged between forming the vegetation layer and planting the tree.

The method of arranging the tree growing ground of dredged landfills according to the present invention includes the installation of drainage layers through the installation of drainage layers, the installation of planting layers through the installation of vegetative soil compositions mixed with dredged soil and soil modifiers, and the planting of trees. It improves the environment of dredged landfill, especially the dredged landfill, which is made of dredged landfill, especially subsea dredged soil, and at the same time improves the environment of dredged landfill, which allows plants to grow normally. It is a construction method.

FIG. 1 is a photograph showing the growth state of about 9 months after planting of pine ( Pinus thunbergii ) in Example 1, Example 2, Comparative Example 1, and Comparative Example 2, Figure 2 is Example 1 , Example 2, Comparative Example 1, and Comparative Example 2 is a photograph showing the growth state when about 9 months have passed after planting Celtis sinensis , Figure 3 is Example 1, Example 2, Comparative Example 1 , And Comparative Example 2 is a photograph showing the state of growth when about 9 months have passed since the planting of the Chionanthus retusus .

The present invention relates to a method for forming a tree growing ground of a dredged landfill, comprising forming a drainage layer, forming a vegetation layer, and planting a tree, preferably forming a vegetation layer and a tree Fixing the indicator between the planting step may be further included. Hereinafter, the present invention will be described by dividing each step.

Drainage layer  Forming steps

The step of forming the drainage layer in the method for forming the tree growing ground of the dredged soil landfill according to the present invention is specifically to remove the dredged soil of the surface layer of the dredged landfill to a predetermined depth, which is selected from gravel, wood chips, or the first soil improving agent It consists of laying one drainage layer material.

At this time, the dredged soil is a general term for all types of soil, sand, sand, etc. deposited when dredging the bottom of the lake, sea, river. In addition, the dredged landfill is preferably a subsea dredged landfill in the present invention, considering that the method for arranging the tree growing ground according to the present invention is mainly performed on the ground of a subsea dredged landfill such as a coastal landfill and a reclaimed land.

In order to form a drainage layer in the method of arranging the tree growing ground of the dredged landfill according to the present invention, first dredged soil of the surface layer of the dredged landfill land. At this time, the depth of the dredged soil is not limited to a large range, but considering the economical efficiency of the tree planting method and the ground composition method described later, it is preferable that the depth of about 1 ~ 2m, more preferably 1.2 ~ 1.8m.

After that, the drainage layer is laid in the place where the dredged soil is removed to form a drainage layer. The drainage layer material is any one selected from gravel, wood chips, or the first soil improving agent, and the wood chips are preferably wood chips of hardwoods. In addition, the first soil-improvement agent blocks the rise of the excess salt-containing capillary water rising from the base of the forest, and the excess salt to the organic matter flakes of the size that drains the excess salt accumulated in the topsoil into the rhizosphere by the tide, salt, and splash. A substance that absorbs, substitutes, insolubilizes, fixes, precipitates, and the like and absorbs and stores these substances is applied and adsorbed onto the organic material pieces. Specifically, the first soil modifier is an aqueous solution in which at least one compound selected from the group consisting of calcium phosphate, ammonium phosphate, ammonium sulfate, potassium nitrate, calcium cyanide, ammonium nitrate, potassium sulfate, and manganese sulfate is dissolved in a bark. It is electrodeposited or absorbed by spraying or dipping and semi-dried, and then coated with at least one material selected from carbonic acid powder, vermiculite or sulfur powder, and more preferably pulverized and prepared to have a particle size of 1-2 cm. Spray the aqueous solution at 15 to 30 ° C. in which calcium phosphate, ammonium phosphate, ammonium sulfate, potassium nitrate, calcium cyanide, ammonium nitrate, potassium sulfate, and manganese sulfate are dissolved at a concentration of 100 to 500 ppm. After immersion, it is electrodeposited or absorbed and semi-dried to have a water content of 20-30%, and then coated with carbonic acid powder, vermiculite and sulfur powder. The first soil improving agent used in the present invention is commercially available, for example, BioGro-Bark (hereinafter referred to as 'BG-Bark'; Manufacturer: Garim Environment Development Co., Ltd., Korea), and the like. It can be adjusted to suit the purpose of use. In this invention, the installation thickness of a drainage layer material is not restrict | limited significantly, For example, it is preferable that it is 10-50 cm, It is more preferable that it is 10-30 cm, It is most preferable that it is 10-20 cm.

Vegetation layer  Forming steps

The step of forming the vegetation layer in the method of arranging the tree growing ground of the dredged landfill according to the present invention is specifically a vegetation soil composition or dredged soil, a soil and a second soil collected from a mixture of dredged soil and a second soil modifier on the drainage layer. It consists of laying the vegetation soil composition which mixed and improved the modifier. At this time, the amount of the second soil modifier of the vegetation soil composition to be installed is increased as the depth is closer to the surface in consideration of the fact that the roots of the trees that absorb most of the moisture and nutrients are concentrated at the depth close to the surface. Do. This is to create a natural environment suitable for tree growth by implementing a structure such as forest soil.

In the step of forming the vegetation layer of the present invention, the vegetation soil composition is preferably formed by mixing 10-80 kg of the second soil modifier per 1 m 3 of dredged soil, and 20-80 kg of the second soil modifier per 1 m 3 of dredged soil. It is more preferable that it is mixed and it is more preferable, and it is most preferable to mix and composition 20-60 kg of 2nd soil improvers per 1m <3> of dredged soil. In addition, in the step of forming the vegetation layer of the present invention, the vegetation soil composition is another example of a second soil improver per 1㎥ of vegetation soil, which is a mixture of 50 to 80% by volume of dredged soil and 20 to 50% by volume of soil taken from the acid 10 to 80 kg is preferably mixed, and the second soil modifier 20 to 80 kg is mixed per 1 m 3 of vegetation soil formed by mixing 50 to 80 volume% of the dredged soil and 20 to 50 volume% of the soil collected from the acid. More preferably, it is most preferable to mix 20 to 60 kg of the second soil modifier per 1 m 3 of vegetation soil formed by mixing 50 to 80% by volume of dredged soil and 20 to 50% by volume of soil taken from the acid. At this time, the dredged soil constituting the vegetation soil composition refers to all types of soil, sand, sand, etc. deposited when dredging the bottom of the lake, sea, river, etc., when the dredged landfill according to the present invention is a subsea dredged landfill It is preferable that it is a subsea dredged soil. Subsea dredged soils The dredged soils extracted from landfills are used directly in vegetation soil compositions, which is advantageous in terms of economics such as cost reduction and time savings. In addition, when the soil collected from the acid in the vegetation soil composition is about 20% by volume, it is possible to grow trees or plant seeds in the dredged landfill surface, but when watering is difficult, the soil collected from the mountain is about 50% by volume. You may use it. In the present invention, the installation thickness of the vegetation soil composition is not particularly limited, for example, preferably 50 to 190 cm, more preferably 70 to 190 cm, and most preferably 100 to 180 cm. In addition, the vegetation layer in the ground composition method of the dredged soil landfill according to the present invention is preferably a vegetation soil composition prepared by mixing 10 ~ 30kg of the second soil improver per 1㎥ of dredged soil to a thickness of 25 ~ 100㎝ The vegetation soil composition prepared by mixing 30-50 kg of the second soil modifier per 1 m3 of dredged soil was laid to a thickness of 15-65 cm, and the second soil modifier 50 m-80 kg per 1 m3 of dredged soil thereon. It can be formed by laying the soil composition for vegetation mixed by mixing to a thickness of 5 ~ 25cm. In addition, in the ground composition method of the dredged landfill according to the present invention, the vegetation layer is preferably made per 1 m 3 of vegetation soil formed by mixing 50 ~ 80 volume% of dredged soil and 20 ~ 50 volume% of soil taken from the acid on the drainage layer. 2 A vegetation soil composition prepared by mixing 10-30 kg of soil improving agent is laid to a thickness of 25-100 cm, and the vegetation is formed by mixing 50-80% by volume of dredged soil and 20-50% by volume of soil collected from the mountain. A vegetation soil composition prepared by mixing 30-50 kg of the second soil modifier per m3 of the soil was laid to a thickness of 15-65 cm, and 50-50% by volume of dredged soil and 20-50 volumes of soil collected from the acid. The vegetation soil composition prepared by mixing 50 to 80 kg of the second soil modifier per 1 m 3 of the vegetation soil formed by mixing% may be formed by laying the layer with a thickness of 5 to 25 cm.

On the other hand, the second soil improving agent constituting the vegetation soil composition largely includes (a) Group 1 improved material, (b) Group 2 improved material, and (c) Group 3 improved material.

(a) Group 1 improved substances

Group 1 improved substances act to reduce the dispersibility and increase the cohesiveness of soil particles, which aggregates the soil particles of dredged soil to promote granulation (initiation accelerator), and to promote particle coagulation (particle coagulation). Accelerators) and substances that promote soiling (soilation promoters).

In the water-drained particulate soil, the introduced air (oxygen) accelerates the drying and promotes the physicochemical improvement of the soil by encouraging the activity of fermentation bacteria and aerobic bacteria present in the air, which are incorporated into organic materials contained in the Group 2 improved substances. Promote. In the process of fermentation and decomposition of organic substances that cause odors in sediment due to the activity of bacteria, the generation of hydrogen sulfide or methane gas is reduced, and carbon dioxide, which is generally generated, is gas exchanged through soil pores. In addition, the inflow and outflow of these gas bodies between soil particles encourages the development of soil voids. As soil voids develop, dispersible sodium ions and potassium ions that are released by substitutional ions are discharged through the pores while dissolved in water. Sodium ions and potassium ions are discharged to prevent the dispersion of particulate soils. To make things faster.

The granulation accelerator, particle coagulation accelerator, and soil accelerator, which are components of the Group 1 improved substance, which bring about such effects, are described in detail.

First, the initiation promoter includes a calcium compound and a magnesium compound. At this time, the weight ratio of calcium compound: magnesium compound is preferably 3-5. The calcium compound is a compound selected from the group consisting of CaSO ₄ , CaCl ₂ , Ca (OH) ₂ , CaCO ₃ , Ca (NO ₃ ) ₂ , CaO, Ca (OH) ₂ , Ca (H ₂ PO ₄ ) ₂ or their Mixture. The magnesium compound is a compound selected from the group consisting of MgO, MgSO ₄ , MgCl ₂ , MgCO ₃ , MgNH ₂ PO ₄ , Mg ₂ P ₂ O ₇ , MgS, or a mixture thereof.

Particle coagulation accelerators include iron compounds and aluminum compounds. At this time, the weight ratio of iron compound to aluminum compound is preferably from 6 to 8: 1. The iron compound is selected from the group consisting of Fe-composite CaOFe ₂ O ₃ , CaOAl ₂ O ₃ Fe ₂ O ₃ , including FeO, Fe ₂ O ₃ , Fe ₃ O ₄ , FeS, FeSO ₄ , Fe-EDTA, or Mixtures thereof. The aluminum compound is selected from the group consisting of Al ₂ O ₃ , Al ₃ (SO ₄ ) ₃ , Al (OH) ₂ , AlK (SO ₄ ) ₂ , AlNH ₄ (SO ₄ ) _2, etc. Mixtures thereof.

The soiling promoter includes a silicon compound, which is a compound selected from the group consisting of SiO ₂ , CaSiO ₃ , CaOSiO ₂ , or the like, or mixtures thereof.

The composition of the group 1 improved material is 65 to 85% by weight of the granulation accelerator, 1 to 6% by weight of the particle coagulation accelerator, and 10 to 30% by weight of the soiling accelerator, based on the total weight of the group 1 improved material. Preferably it is 70 to 82 weight% of granulation accelerators, 2 to 5 weight% of particle coagulation promoters, and 15 to 25 weight% of soiling accelerators.

If soil dispersibility decreases and promotes initiation with Group 1 improved materials, soil voids increase, resulting in a sharp increase in permeability. Due to this effect, dispersible ions that have been biased in the soil are leached with water, and various anions are present in the dredged soil.

The mixing amount of the group 1 improving material in the soil improving agent is preferably 35 to 54.9 wt%, more preferably 40 to 49.8 wt% based on the total weight of the second soil improving agent.

(b) Group 2 improved substances

Group 2 improved substances refer to soil stabilization, plant growth ionic mixtures and organics. Organic matter is supposed to ferment geodegradable organic matter which can contain organic components in soil for a long time. By mixing these ingredients with the soil modifying agent of the present invention, the nutrient elements necessary for the survival of the organisms in the soil are added, and in particular, the nutrient elements necessary for plant growth are added, and the nutrient balance is compensated for when improving the sediment or sludge. Will be

In other words, the two-group improved substance complements the action of the one-group improved substance, and various cations and nutrient ions necessary for the growth of organic matter and plants become the main material source. If organic matter is mixed with low earth or sludge to be rapidly decomposed by microorganisms, there is a risk of increasing the viscosity rather than improving the physical properties of the soil. Therefore, the organic materials used in the improver are fermented microorganisms [4-5 and 10] after crushing the wood of bark or oaks (oak, gingko, oyster, oak, chestnut, oak, etc.) of low-degradable trees. Fermented bacteria belonging to the genus are used as fermentation microorganisms, such as bacillus subtilus, B. pumilus , micrococcus glutamicus Etc. In addition, an effective microorganism (EM), which is a commercially available fermentation agent, can also be used. In addition to the wood of the oaks, wood or coconut fiber such as mulberry, birch, and birch may be completely fermented.

Organic substances used in the Group 2 improved substances are produced by fermenting organic substances with a high lignin content of oak and tree wood fibers as fermentation enzymes. The reason is that general organic matter is easy to decompose, so the effect is low in sustainability and the amount of corrosion remaining in the soil is small. These high quality organics have a water content of 30 to 50% by weight, fermented organic content of 50 to 70% by weight, and a carbohydrate to nitrogen ratio (Cabohydrate / Nitrogen ratio: C / N ratio) in the range of 30 to 35 (w / w). The heavy metal content must meet the national process standard.

Soil stability and plant growth ion mixtures are as follows. The nitrogen compound is a compound selected from the group consisting of (NH ₄ ) ₂ SO ₄ , NH ₄ NO ₃ , NH ₄ Cl, HNO ₃ , KNO ₃ , (NH ₂ ) ₂ CO and the like or a mixture thereof. Phosphoric acid compounds include H ₃ PO ₄ , KH ₂ PO ₄ , KH ₂ PO ₄ , K ₂ HPO ₄ , Soluble Ratio, Thomas In Ratio, NH ₄ H ₂ PO ₄ , (NH ₄ ) ₂ HPO ₄ , Sodium Phosphate, CaH ₂ PO ₄ , Ca (H ₂ PO ₄ ) ₂ , a compound selected from the group consisting of lime, superphosphate lime, or the like, or a mixture thereof, and the girly compound is composed of K ₂ SO ₄ , KCl, KNO ₃ , KHSO ₄ , KMnO ₄ , and the like. Compounds selected from the group or mixtures thereof. Composite materials of phosphoric acid and garlic include KH ₂ PO ₄ , K ₂ HPO _4, and the like. The sulfur compound is a compound selected from the group consisting of (NH ₄ ) ₂ SO ₄ , CaSO ₄ , MgSO ₄ , K ₂ SO ₄ , FeS, H ₂ SO ₄ and powdered sulfur or mixtures thereof, and the molybdenum compound is MoO, ammonium mole A compound selected from the group consisting of ribdate and sodium molybdate or mixtures thereof, and the boron compound is borax, boric acid (H ₃ BO ₃ ), K ₂ B ₄ O ₇ , B ₂ O ₃ , B ₂ O ₂ , H ₄ B ₂ O ₄ or the like selected from the group consisting of compounds or mixtures thereof, zinc compounds are selected from the group consisting of Zn (OH) ₂ , ZnSO ₄ , ZnCl ₂ and the like or mixtures thereof, manganese compounds are MnO ₂ , Mn ₂ O ₃ , Mn ₃ O ₄ , Mn (OH) ₂ , MnCl ₂ , MnSO ₄ or the like, or a mixture thereof. The copper compound is Cu (OH) ₂ , CuCl ₂ , CuSO ₄ Compound selected from the group consisting of the same or mixtures thereof, Small compounds _{KCl, NH 4 Cl, MgCl 2} , CaCl 2, is a mixture of the selected compound, or from the group consisting of HCl.

The amount of organic compounds and soil stabilization and plant growth ionic compound compounds that make up these two-group improved substances was 55 to 80 wt% based on the total weight of the two-group improved substances, 3 to 18 wt% nitrogen compounds, and phosphoric acid compounds. 3 to 25 weight percent silver, 2 to 7 weight percent girly, 0.3 to 0.5 weight percent sulfur, 0.5 to 1 weight percent molybdenum, 1 to 3 weight percent boron and 0.5 to 0.8 weight zinc %, Manganese compound is 0.5 to 1.0% by weight, copper compound is 0.3 to 0.8% by weight, and chlorine compound is 0.3 to 0.5% by weight. Preferably 60 to 75% by weight of organic compounds, 5 to 15% by weight of nitrogen compounds, 5 to 20% by weight of phosphoric acid compounds, 3 to 5% by weight of girly compounds, 0.3 to 0.5% by weight of sulfur compounds, molybdenum compounds 0.5 to 1% by weight, boron compound 1 to 3% by weight, zinc compound 0.5 to 0.8% by weight, manganese compound 0.5 to 1.0% by weight, copper compound 0.3 to 0.8% by weight, chlorine compound 0.3 to 0.5% by weight to be.

In the second soil improving agent, the mixing amount of the two groups of improving materials is preferably 45 to 64 wt%, more preferably 50 to 59.5 wt% based on the total weight of the second soil improving agent.

(c) Group 3 improved substances

Group 3 modified substances are photosynthetic action among blue algae-cyanobacteria among the algae classified into nine sentences, cyanobacteria with high ability to synthesize complex sugars, and several species that freely dissolve Na ions in salt soil. It is mixed. Among many cyanobacteria, Anabaena, Anabaenopsis, Dactylococcopsis, Synechocystis and Microcystis are extracted and cultured. .

These blue algae replace the excess sodium in the salt soil, promote the decomposition of organic matter in the soil, increase the effective organic matter content, fix nitrogen phosphate to increase the effectiveness of cations, and promote the release of salts in the soil. It prevents excessive salt damage, and acts as photosynthesis and polysaccharides to become a source of nutrients, and to improve the physical properties of promoting aeration and drainage by constructing the grain structure of the soil by the interaction of organic matter and microorganisms. It improves chemical properties such as calibration and prevents soil hardening under the influence of gases such as oxygen generated by photosynthesis. These cyanobacteria also have the effect of adsorbing heavy metals on various test records. These cyanobacteria are inoculated into bark low-degradable organics, that is, organic matter of two groups of improved substances, which have been fermented with cultured aerobic microorganisms. The algae you use will also greatly benefit the fixation of contaminants.

In the second soil improving agent, the mixing amount of the three group improving materials is preferably 0.1 to 1.0 wt%, more preferably 0.2 to 0.5 wt% based on the total weight of the second soil improving agent.

The second soil modifier constituting the vegetation soil composition according to the present invention is commercially available, such as BioGro-Eleven (hereinafter referred to as 'BG-11'; Manufacturer: Garim Environment Development Co., Korea) The above product can be used after being adjusted to the use of the present invention. Specifically, the second soil modifier constituting the vegetation soil composition according to the present invention in the following examples excludes a mixture of zeolite, bentonite, vermiculite and activated carbon, silica, silicate and wollastonite from BG-11. However, the second soil modifier used in the present invention does not exclude zeolite, bentonite, vermiculite and mixtures of activated carbon, silica, silicate and wollastonite, for example, the second soil modifier used in the present invention is d) The remaining amount of the Group 4 improved material consisting of 70 to 87% by weight of zeolite, 2 to 15% by weight of bentonite, 2 to 15% by weight of vermiculite and 2 to 7% by weight of a mixture of activated carbon, silica, silicate and wollastonite. have.

Fixing the surface of the dredged landfill

The method of arranging the tree growing ground of the dredged landfill according to the present invention may further include optionally fixing the indicator of the dredged landfill. Fixing the indicator of the dredged landfill land is disposed between the step of forming a vegetation layer and the planting of trees to be described later, and sowing the seeds of the plant in the vegetation layer, the plant seeds are coated to Fix the indicator. At this time, if the seed of the plant is a well-known thing used to fix the surface of the slope such as grass seed, herbaceous seed, the type is not greatly limited, and among these, grass seed, especially Korean grass ( Zoysia) japonica ) seeds. Korean grass has excellent resistance to fire, flame and hot tolerance.

Sowing of the plant seeds is carried out in the form of mechanical sowing using a seed sprayer (Hydroseeder), wherein the grass seeds are preferably sown at a density of 20 ~ 50g per m 2 of vegetation layer. In addition, the grass seed is preferably seeded after being mixed with a surface improver such as pulp, wherein the mixing weight ratio of the grass seed and pulp is 2: 1 to 1: 1.

Steps to plant trees

The method for arranging the tree growing ground of the dredged landfill according to the present invention includes planting trees in the vegetation layer. At this time, the planting of the tree is preferably made after the vegetation layer is formed and the ground of the dredged landfill is improved to be suitable for plant growth. The types of trees to be planted are not particularly limited, and may be, for example, a species that can be grown in a dredged landfill area, preferably, for example, Pinus thunbergii and Celtis. sinensis ), Popcorn ( Chionanthus) retusus ), Elm ( Ulmus davidiana ), and bramble ( Quercus) myrsinaefolia ) may be composed of one or more selected from the group consisting of, more preferably sea pine (海松: Pinus thunbergii ), hackberry ( Celtis sinensis ), and Poplar ( Chionanthus) retusus ) may be composed of one or more selected from the group consisting of.

Hereinafter, the present invention will be described in more detail with reference to Examples. However, the following examples are only for clearly illustrating the present invention, and do not limit the protection scope of the present invention.

1. Survey Sheet

(1) test paper location and environment

The test site is 1.5km from Saemangeum embankment entrance in Gunsan-si, Jeollabuk-do, and is an area where the dredged soil is buried with a slope of about 5%. In addition to the problems of dredged soils, which are artificial grounds created in the middle of the sea, the soil is severely compacted, so the drainage is poor, and the direct damage of plants by strong wind, rain, spray, salt, etc. It has a very unfavorable environment for plant growth, such as excessive salts that accumulate on the topsoil.

(2) soil analysis of test paper

The test location was determined and the site survey was carried out on the artificial ground of the Saemangeum seawall dredged soil. Soil samples were taken by depth to analyze the chemical and physical properties to identify problems and to determine the direction of the test and the degree of improvement. The results of the physicochemical analysis of the subsea dredged soil collected from the test paper before the soil improvement (Saemangeum seawall) are shown in Table 1 below. As a result, Saturn showed Loamy Sand (LS) with a sand content of more than 75%. The dredged soil acidity (pH) of the test paper was strongly alkaline with a pH of at least 8.0. Nutrient ions such as nitrogen, phosphoric acid and other organic matters were found to be very low compared to general forest soils, and had high electrical conductivity (EC) and salt concentration (NaCl). The permeation rate is 3.5 × 10 ^-4 cm / sec at the depth of 30 cm, 1.7 × 10 ^-4 cm / sec at the depth of 60 cm, and 3.8 × 10 ^-4 cm / sec at the depth of 90 cm This figure indicates that the permeation rate is much slower than the range of general forest soils, which means that the soil is poorly ventilated and drained.

Analysis item Soil depth (cm) 30 60 90 ingredient Sand (%) 81.08 80.20 75.58 Mass (Slit,%) 18.28 18.52 22.49 Clay (%) 0.64 1.28 1.93 Soil texture LS LS LS Soil pH 8.87 9.14 8.37 Permeation Speed (cm / sec) 3.5 × 10 ^-4 1.7 × 10 ^-4 3.8 × 10 ^-4 Organic matter (%) 0.05 0.19 0.24 Total nitrogen (%) 0.024 0.027 0.023 P ₂ O ₅ (mg / kg) 17.82 18.10 13.63 Cation exchange capacity (CEC, cmolc / ㎏) 3.63 3.68 3.53 Substituent Cation (cmolc / kg) K ⁺ 0.95 0.84 0.68 Na ⁺ 2.21 2.01 1.28 Ca ^{2 +} 0.96 0.89 1.37 Mg ^{2 +} 1.59 1.40 2.12 EC (dS / m) 1.49 1.46 1.31 NaCl (Salinity,%) 0.26 0.50 0.22

2. For vegetation  Preparation of Soil Composition

Production Example 1

A soil composition for vegetation was prepared by mixing 20 kg of BG-11 (manufacturer: Garim Environment Development, Korea), a soil improver per 1㎥ of dredged soil. At this time, the submerged dredged soil was used from the landfill artificial ground.

Production Example 2

A soil composition for vegetation was prepared by mixing 40 kg of soil improver BG-11 (manufacturer: Garim Environment Development Co., Ltd., Korea) per 1㎥ of dredged soil. At this time, the submerged dredged soil was used from the landfill artificial ground.

Preparation Example 3.

A soil composition for vegetation was prepared by mixing 60 kg of BG-11 (manufacturer: Garim Environment Development Co., Ltd., Korea) as a soil improver per 1㎥ of dredged soil. At this time, the submerged dredged soil was used from the landfill artificial ground.

Preparation Example 4.

After mixing 80 vol% of subsea dredged soil and 20 vol% of acid soil brought in from outside, the vegetation soil was formed, and 20 kg of BG-11 (manufacturer: Garim Environment Development Co., Ltd.) per 1㎥ of the vegetation soil was manufactured. To prepare a soil composition for vegetation was mixed. At this time, the submerged dredged soil was used from the landfill artificial ground.

Preparation Example 5.

After mixing 80 vol% of seabed dredged soil and 20 vol% of acid soil brought in from outside to form vegetation soil, 40kg of BG-11 (manufacturer: Garim Environment Development Co., Ltd.) per 1㎥ of the vegetation soil To prepare a soil composition for vegetation was mixed. At this time, the submerged dredged soil was used from the landfill artificial ground.

Preparation Example 6.

After mixing 80 vol% of seabed dredged soil and 20 vol% of acid soil brought in from outside to form vegetation soil, BG-11 (manufacturer: Garim Environment Development Co., Ltd., Korea) 60kg per 1㎥ of vegetation soil To prepare a soil composition for vegetation was mixed. At this time, the submerged dredged soil was used from the landfill artificial ground.

3. Creation of a tree growing ground in a subsea dredged landfill

Example 1.

Submerged Dredged Soil The submerged dredged soil of the reclaimed artificial ground is removed and a test forge of 3m in width, 20m in length and 1.65m in depth is formed. Was installed to form a drainage layer. Thereafter, the vegetation soil composition prepared in Preparation Example 1 was laid on the drainage layer to a thickness of 80 cm, and the vegetation soil composition prepared in Preparation Example 2 was laid on the drainage layer to a thickness of 50 cm. The vegetation soil composition prepared in was laid to a thickness of 20 cm to form a vegetation layer. Afterwards, the Korean grass seed and pulp, a surface modifier, were mixed and mechanically sown in a vegetation layer with a density of 20 g / m2 (vegetation layer) and 12 g / m2 (vegetation layer). After that, passive management and periodic irrigation such as watering and hand weeding on young weed shoots were performed. In addition, about three months after the formation of the vegetation layer, it is sent to the vegetation layer (海松: Pinus thunbergii ), Hackberry ( Celtis) sinensis ), Popcorn ( Chionanthus) retusus ), Elm ( Ulmus davidiana ), and bramble ( Quercus) myrsinaefolia ) was planted at predetermined intervals.

Example 2.

Submerged Dredged Soil The submerged dredged soil of the reclaimed artificial ground is removed and a test forge of 3m in width, 20m in length and 1.65m in depth is formed. Was installed to form a drainage layer. Thereafter, the vegetation soil composition prepared in Preparation Example 4 was laid on the drainage layer at a thickness of 80 cm, and the vegetation soil composition prepared in Preparation Example 5 was laid on the drainage layer at a thickness of 50 cm. The vegetation soil composition prepared in was laid to a thickness of 20 cm to form a vegetation layer. Afterwards, the Korean grass seed and pulp, a surface modifier, were mixed and mechanically sown in a vegetation layer with a density of 20 g / m2 (vegetation layer) and 12 g / m2 (vegetation layer). After that, passive management and periodic irrigation such as watering and hand weeding on young weed shoots were performed. In addition, about three months after the formation of the vegetation layer, it was found in the vegetation layer ( Pinus thunbergii ), Sesame ( Celtis sinensis ), and Chionanthus retusus ), Elm ( Ulmus davidiana ) and Quercus myrsinaefolia were planted at predetermined intervals.

Example 3.

Subsurface Dredged Soil The dredged soil of reclaimed artificial ground was removed, and a test forge of 3m in width, 20m in length and 1.65m in depth was formed. Thereafter, the vegetation soil composition prepared in Preparation Example 1 was laid on the drainage layer to a thickness of 80 cm, and the vegetation soil composition prepared in Preparation Example 2 was laid on the drainage layer to a thickness of 50 cm. The vegetation soil composition prepared in was laid to a thickness of 20 cm to form a vegetation layer. Afterwards, the Korean grass seed and pulp, a surface modifier, were mixed and mechanically sown in a vegetation layer with a density of 20 g / m2 (vegetation layer) and 12 g / m2 (vegetation layer). After that, passive management and periodic irrigation such as watering and hand weeding on young weed shoots were performed. In addition, about three months after the formation of the vegetation layer, it was found in the vegetation layer (Hammatsu: Pinus thunbergii ), Celtis sinensis , Chionanthus retusus , and Elm ( Ulmus). davidiana ), and bramble ( Quercus) myrsinaefolia ) was planted at predetermined intervals.

Example 4.

Subsurface Dredged Soil The dredged soil of the reclaimed artificial ground was removed, and a test forge having a width of 3m, a length of 20m, and a depth of 1.65m was formed, and gravel was laid to a thickness of 15cm as a drainage layer to form a drainage layer. Thereafter, the vegetation soil composition prepared in Preparation Example 1 was laid on the drainage layer to a thickness of 80 cm, and the vegetation soil composition prepared in Preparation Example 2 was laid on the drainage layer to a thickness of 50 cm. The vegetation soil composition prepared in was laid to a thickness of 20 cm to form a vegetation layer. Afterwards, the Korean grass seed and pulp, a surface modifier, were mixed and mechanically sown in a vegetation layer with a density of 20 g / m2 (vegetation layer) and 12 g / m2 (vegetation layer). After that, passive management and periodic irrigation such as watering and hand weeding on young weed shoots were performed. In addition, about three months after the formation of the vegetation layer, it was found in the vegetation layer (Hammatsu: Pinus thunbergii ), Celtis sinensis , Chionanthus retusus , and Elm ( Ulmus). davidiana ), and bramble ( Quercus) myrsinaefolia ) was planted at predetermined intervals.

Comparative Example 1.

Submerged Dredged Soil The submerged dredged soil of the reclaimed artificial ground is removed and a test forge of 3m in width, 20m in length and 1.65m in depth is formed. Was installed to form a drainage layer. Thereafter, the seabed dredged soil was laid on the drainage layer to a thickness of 150 cm to form a vegetation layer. Afterwards, the Korean grass seed and pulp, a surface modifier, were mixed and mechanically sown in a vegetation layer with a density of 20 g / m2 (vegetation layer) and 12 g / m2 (vegetation layer). After that, passive management and periodic irrigation such as watering and hand weeding on young weed shoots were performed. In addition, about three months after the formation of the vegetation layer, it was found in the vegetation layer (Hammatsu: Pinus thunbergii ), Celtis sinensis , Chionanthus retusus , and Elm ( Ulmus). davidiana ), and bramble ( Quercus) myrsinaefolia ) was planted at predetermined intervals.

Comparative Example 2

Subsurface Dredged Soil The dredged soil of reclaimed artificial ground was formed to form a test forge with a width of 3m, a length of 20m, and a depth of 0.5m, and the mountain soil brought in from the outside was laid to a thickness of 50cm to form a vegetation layer. Afterwards, the Korean grass seed and pulp, a surface modifier, were mixed and mechanically sown in a vegetation layer with a density of 20 g / m2 (vegetation layer) and 12 g / m2 (vegetation layer). After that, passive management and periodic irrigation such as watering and hand weeding on young weed shoots were performed. In addition, about three months after the formation of the vegetation layer, it was found in the vegetation layer (Pietus thunbergii ), Celtis sinensis , Chionanthus retusus , Ulmus davidiana , and Quercus ( Quercus). myrsinaefolia ) was planted at predetermined intervals.

Comparative Example 3

Submarine Dredged Soil The dredged soil of reclaimed artificial ground was removed and a test forge of 3m in width, 20m in length and 1.5m in depth was formed. Thereafter, the vegetation soil composition prepared in Preparation Example 1 was laid on a test forge at a thickness of 80 cm, and the vegetation soil composition prepared in Preparation Example 2 was laid at a thickness of 50 cm on it, and the preparation example thereon was again placed thereon. The vegetation soil composition prepared in 3 was laid to a thickness of 20 cm to form a vegetation layer. Afterwards, the Korean grass seed and pulp, a surface modifier, were mixed and mechanically sown in a vegetation layer with a density of 20 g / m2 (vegetation layer) and 12 g / m2 (vegetation layer). After that, passive management and periodic irrigation such as watering and hand weeding on young weed shoots were performed. In addition, about three months after the formation of the vegetation layer, it was found in the vegetation layer (Hammatsu: Pinus thunbergii ), Celtis sinensis , Chionanthus retusus , and Elm ( Ulmus). davidiana ), and bramble ( Quercus) myrsinaefolia ) was planted at predetermined intervals.

4. Changes in Physical Properties after Formation of Tree Growth Ground in Submarine Dredged Landfill

(1) Changes of Soil Water Contents by Depth after Formation of Tree Growing Soil in Submarine Dredged Landfill

In Example 1, Example 3, Example 4 and Comparative Example 3, the soil moisture content of each soil was measured when one month elapsed after the vegetation layer was formed. For this purpose, a water gauge, soil moisture sensor, and groundwater quality observation hole were installed on the test site. The water level meter was equipped with four pressure level gauges (DIVER mini) for water level observation in a 3.4m long stainless steel pipe (φ10㎝) and was continuously recorded at 30-minute intervals in a data logger. Soil Moisture Measurement Sensor (FDR) was installed in each treatment zone, 14 in total, and soil moisture was measured by depth (10, 50, 120, 180cm) and continuously measured at 1 hour intervals. Underground water quality observation holes were installed in a 3.4m long stainless steel pipe (φ10㎝) with water sample bottles placed 3m deep and 15cm apart. Table 2 shows the soil moisture content measurement results according to the drainage layer. As shown in Table 2, the dredged soil landfill with no drainage layer showed a drastic change in soil moisture content (Comparative Example 3). On the other hand, the subsurface dredged landfill with the drainage layer was slow in soil moisture content (Examples 1, 3 and 4), and the most stable soil moisture content was changed when BG-Bark (manufactured by Garim Environment Development Co., Ltd., Korea) was used as the drainage layer. Is shown (Example 1).

division Soil moisture content (%) Example 1 Example 3 Example 4 Comparative Example 3 Depth 10 cm 21.0 9.0 13.1 14.2 50 cm 22.4 13.4 19.4 13.7 120 cm 34.3 32.7 24.6 34.9 180 cm 46.7 49.7 36.8 54.3

(2) Changes of Permeation Rate by Depth after Formation of Tree Growth Ground in Submarine Dredged Landfill

In Example 1, Example 2, and Comparative Example 1, the water permeation rate for each depth was measured as an indicator of physical properties when one month has passed after the vegetation layer is formed, and the results are shown in Table 3. As shown in Table 3, the permeation rate is in the range of 10 ^-3 cm / sec when the vegetation layer is formed by mixing the dredged soil and the soil improver, or by using the vegetative soil composition formed by mixing the seabed dredged soil, the mountain soil, and the soil improver. However, the permeation rate was poor in the range of 10 ⁻⁴ cm / sec when only the seabed dredged soil was formed to form the vegetation layer.

division Permeation Speed (cm / sec) Example 1 Example 2 Comparative Example 1 Depth 30 cm 2.8 × 10 ^-3 2.1 × 10 ^-3 4.0 × 10 ^-4 60 cm 2.6 × 10 ^-3 1.3 × 10 ^-3 6.1 × 10 ^-4 90 cm 2.3 × 10 ^-3 1.7 × 10 ^-3 3.7 × 10 ^-4 120 cm 1.7 × 10 ^-3 1.6 × 10 ^-3 3.5 × 10 ^-4

(3) Changes in Soil pH and Salinity after Formation of Tree Growing Soils in Submarine Dredged Landfills

 In Example 1, Example 2, and Comparative Example 1, soil pH and salinity change of 120 cm depth were measured over time after vegetation layer formation as an indicator of chemical properties after vegetation layer formation. At this time, the salt concentration was replaced by the concentration of sodium chloride (NaCl), and the results are shown in Table 4. As shown in Table 4, a soil pH suitable for tree growth within one month when a dredged soil is mixed with a soil modifier or a vegetative soil composition formed by mixing a subsea dredged soil, a mountain soil, and a soil modifier is formed. And the soil was improved by the salt concentration (0.05% or less), but the soil pH and salt concentration continued to be unsuitable for the growth of trees when the seabed dredged to form vegetation layer.

division Example 1 Example 2 Comparative Example 1 Soil pH NaCl (%) Soil pH NaCl (%) Soil pH NaCl (%) Elapsed time after tree growth foundation 10 days 7.66 0.017 7.07 0.029 8.64 0.351 40 days 7.85 0.018 7.51 0.013 9.07 0.222 65 days 7.52 0.013 7.29 0.017 9.51 0.159 90 days 7.73 0.012 7.70 0.011 9.66 0.231

5. Changes in the Toil Growth of Trees after Formation of Tree Growth Ground in Submarine Dredged Landfill

In Example 1, Example 2, Comparative Example 1, and Comparative Example 2 when about nine months have passed after planting trees (海松: Pinus thunbergii ), Hackberry ( Celtis) sinensis ), Popcorn ( Chionanthus) retusus ), Elm ( Ulmus davidiana ) and Quercus myrsinaefolia were measured to change the growth of the labor, the results are shown in Table 5.

division Effort growth (cm) Example 1 Example 2 Comparative Example 1 Comparative Example 2 dropsy Haesong 34 31 16 28 Hackberry 22 23 4 2 Popcorn 7 9 3 4 Elm tree 20 26 11 5 Bramble 5 One One One

FIG. 1 is a photograph showing the growth state of about 9 months after planting of pine ( Pinus thunbergii ) in Example 1, Example 2, Comparative Example 1, and Comparative Example 2, Figure 2 is Example 1 , Celtis in Example 2, Comparative Example 1, and Comparative Example 2 ( Celtis sinensis ) is a photograph showing the growth state of about 9 months after planting, Figure 3 is a poplar ( Chionanthus in Example 1, Example 2, Comparative Example 1, and Comparative Example 2 retusus ) Photograph showing the growth state of about 9 months after planting.

As shown in Table 5 and FIGS. 1 to 3, when a vegetation layer is formed by mixing a dredged soil with a soil improver without mountain soil, or using a vegetative soil composition formed by mixing a subsea dredged soil, a mountain soil, and a soil improver. Overall good growth was shown.

Although the present invention has been described through the above embodiments as described above, the present invention is not necessarily limited thereto, and various modifications can be made without departing from the scope and spirit of the present invention. In addition, many modifications may be made to adapt a particular situation and material to the teachings of the invention without departing from the essential scope thereof. Therefore, the protection scope of the present invention should not be construed as limited to the specific embodiments disclosed as the best mode contemplated for carrying out the invention, but including all embodiments falling within the scope of the claims appended hereto.

Claims (12)

Removing the dredged soil of the dredged landfill surface layer to a predetermined depth, and installing a drainage layer selected from gravel, wood chips, or the first soil modifier therein to form a drainage layer;
Forming a vegetation layer by arranging a vegetation soil composition prepared by mixing dredged soil and a second soil modifier on the drainage layer or a vegetation soil composition formed by mixing a dredged soil, soil taken from an acid, and a second soil modifier; And
And planting trees in the vegetation layer.
The first soil modifier is an aqueous solution in which at least one compound selected from the group consisting of calcium phosphate, ammonium phosphate, ammonium sulfate, potassium nitrate, calcium cyanide, ammonium nitrate, potassium sulfate, and manganese sulfate is dissolved in a bark. Electrodeposited or absorbed by spraying or dipping and semi-dried, and then coated with at least one material selected from carbonic acid powder, vermiculite or sulfur powder,
The second soil improving agent (a) 65 to 85% by weight of the granulation promoter including a calcium compound and a magnesium compound in a weight ratio of 3 to 5: 1, iron and aluminum compounds in a weight ratio of 6 to 8: 1 A group 1 improved substance consisting of 1 to 6% by weight of a coagulation accelerator comprising and 10 to 30% by weight of a soiling accelerator comprising a silicon compound, and (b) oak, oak, oyster, sol, oak or bark 55 to 80% by weight of organic or crushed and fully fermented wood or coconut fiber of oak, chestnut, oak, oak, birch, birch, nitrogen compound 3-18%, phosphoric acid compound 3-25%, girly compound 2 to 7 wt%, sulfur compound 0.3 to 0.5 wt%, molybdenum compound 0.5 to 1 wt%, boron compound 1 to 3 wt%, zinc compound 0.5 to 0.8 wt%, manganese compound 0.5 to 1.0 wt%, copper compound 0.3 to 0.8 wt% and 0.3 to 0.5 wt% chlorine compound Group 2 improvement material consisting of% and (c) group 3 consisting of anabaena, anabaenopsis, dactylococcopsis, synechocystis and microcystis. A method for forming a tree growing ground of a dredged landfill comprising an improved substance.
The method of claim 1, further comprising: fixing the indicator of the dredged landfill by planting the seeds of the plant in the vegetation layer,
Fixing the indicator of the dredged landfill land plant growth method of the dredged landfill land, characterized in that disposed between the step of forming the vegetation layer and planting trees.
The method of claim 1 or 2, wherein the dredged landfill is a subsea dredged landfill, and the dredged soil constituting the vegetation soil composition is a subsea dredged soil.
The method of claim 1, wherein the forming of the drainage layer comprises removing dredged soil from the surface of the dredged landfill to a depth of 1 to 2 m.
3. The method of claim 1 or 2, wherein the forming of the drainage layer comprises laying the drainage layer material at a thickness of 10 to 50 cm.
The method of claim 1, wherein the forming of the vegetation layer comprises arranging the vegetation soil composition with a thickness of 50 to 190 cm.
According to claim 1 or 2, wherein the vegetation soil composition of the step of forming a vegetation layer composition of the tree growing ground of the dredged landfill land, characterized in that the mixture was prepared by mixing 10 ~ 80kg of the second soil improver per 1㎥ of dredged soil Way.
The method of claim 7, wherein the forming the vegetation layer is a vegetation soil composition prepared by mixing 10 ~ 30kg of the second soil improver per 1㎥ of dredged soil on the drainage layer to a thickness of 25 ~ 100㎝, dredged soil 1 thereon Vegetation soil composition prepared by mixing 30-50 kg of second soil modifier per m3 was laid to a thickness of 15-65 cm, and vegetation soil was prepared by mixing 50-80 kg of second soil modifier per m3 of dredged soil. A wood growth ground composition method of dredged landfill land, characterized in that the composition is laid in a thickness of 5 ~ 25cm.
According to claim 1 or 2, wherein the vegetation soil composition of the step of forming the vegetation layer per 1 m 3 of vegetation soil formed by mixing 50 ~ 80% by volume of dredged soil and 20 ~ 50% by volume of soil taken from the acid A method for forming a tree growing ground of a dredged landfill land, characterized in that the mixture of 10 to 80 ㎏ second soil improver.
10. The method of claim 9, wherein forming the vegetation layer is 10 to 30 kg of the second soil improver per 1 ㎥ of vegetation soil formed by mixing 50 ~ 80% by volume of dredged soil and 20 ~ 50% by volume of soil taken from the acid on the drainage layer The vegetation soil composition prepared by mixing was laid in a thickness of 25-100 cm, and the second per 1m3 of vegetation soil formed by mixing 50-80% by volume of dredged soil and 20-50% by volume of soil taken from the acid. Vegetation soil composition prepared by mixing 30-50 kg of soil improving agent was laid to a thickness of 15-65 cm, and 50-80% by volume of dredged soil and 20-50% by volume of soil taken from the acid were mixed. A method for forming a tree growing ground of a dredged landfill site, comprising laying a vegetation soil composition prepared by mixing 50-80 kg of a second soil modifier per 1 m 3 of soil to a thickness of 5-25 cm.
The method of claim 1 or claim 2, wherein the second soil improving agent in the step of forming the vegetation layer 35 to 54.9% by weight of the group 1 improved material, 45 to 64% by weight of the 2 group improved material, and 0.1 to 3 group improved material Wood growth ground composition method of the dredged landfill land, characterized in that consisting of 1.0% by weight.
The tree of claim 1 or 2, wherein the tree of the step of planting the tree is a pine tree (海松: Pinus). thunbergii ), Hackberry ( Celtis) sinensis ), Poplar ( Chionanthus retusus ), Elm ( Ulmus davidiana ), and bramble ( Quercus) myrsinaefolia ) The method for forming a tree growing ground of dredged landfills, characterized in that composed of one or more selected from the group consisting of.

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