KR100981358B1 - The soil composition and its manufacturing method that using the dredged soils and industrial by-product for reclaiming the public surface of water - Google Patents

Abstract

PURPOSE: A public surface of water reclaiming soil composition and a manufacturing method thereof are provided to safely solidify dredging soil and industrial by-products. CONSTITUTION: A public surface of water reclaiming soil composition dredging soil and industrial by-products contains the following: 100wt% of mixture including 60wt% of dredged soil and 40wt% of inorganic sludge, or 100wt% of mixture containing the dredging soil and reclaimed coal ash mixed in a ratio of 1:1; 25~40wt% of paper sludge ash or 25~40wt% of coal ash; 20~30wt% of sewage sludge cinder; 5~10wt% of light burned dolomite as a firming agent; 3~7wt% of cement or ground granulated blast-furnace slag; and 0.5~3wt% of coagulation accelerator.

Description

Coated surface landfill composition using dredged soil and industrial by-products and its manufacturing method {THE SOIL COMPOSITION AND ITS MANUFACTURING METHOD THAT USING THE DREDGED SOILS AND INDUSTRIAL BY-PRODUCT FOR RECLAIMING THE PUBLIC SURFACE OF WATER}

The present invention relates to a coarse surface landfill composition and a manufacturing method using dredged soil and industrial by-products. More specifically, the present invention relates to a dredged soil or dredged soil and landfill coal, including inorganic sludge and inorganic solidified soil including waste gypsum and waste lime mixture or purified sludge. , Coarse water reclaimed soil, which is made of inorganic wastes as a main ingredient, and solidifying aids such as paper ash, coal ash (fly ash), sewage sludge incineration ash, and hardeners such as light dolomite, quicklime, cement, and blast furnace slag powder. The present invention relates to a composition and a method for manufacturing the same. Covalent surface landfill composition using industrial by-product and It relates to a manufacturing method thereof.

More than 10 million tons of dredged soils are generated every year due to the construction and maintenance of ports, dredging and repair of sea lanes, and dredging of polluted waters, most of which are reported to be dumped by landfill or ocean. Most of them are public waters, including aquatic farms close to land and fish habitat and spawning areas.

The ocean dumping of generated dredged soil may adversely affect the aquatic ecosystem due to the re-spreading of pollutants, and the landfill and dumping may cause secondary environmental pollution to the surrounding environment by the contaminated dredged soil. Although the side effects of dredged soils are expected to be dealt with in recent years, methods for evaluating dredged soils and reducing the effects of dumping of dredged soils have not been suggested.

As of 2009, dredged soil is classified as waste that is difficult to dispose on land under the Marine Environment Management Act (related to Article 35 Paragraph 1), and the Act on the Treatment, Disposal, and Utilization of Dredged Soil, Pollution Survey, and Regulations on Pollution There is no situation. According to the results of the survey of dredged soils conducted in 2002, dredged soils of major ports were mostly contaminated with organics, nutrients or heavy metals (Ministry of Maritime Affairs & Fisheries, 2003).

The dredged soils of some ports are considered to have high potential for effective utilization due to their low pollution, but there are no legal and technical standards for their use, and review, screen, and manage the effects of dredged soils on the marine environment. Insufficient institutional regulation and technology development have hampered the added value of the marine environment to be protected. Therefore, by developing more reasonable and economical technology for the use of dredged soil, we actively support the domestic marine environment and operate smooth system of dredged soil by operating transparent system for ocean dumping. Active efforts to protect the marine environment from ocean dumping are urgently needed.

Coal ash refers to ash generated as a by-product after combustion of pulverized coal pulverized into small particles of less than 0.7mm in coal-fired power plant. Fly ash and bottom depending on the location It is divided into Bottom Ash. Fly ash occupies 75% ~ 80% of the total ash produced and recycled a lot of materials such as ready mixed concrete, concrete admixture, and clay bricks, but depends on landfilling in the off-season and 15 ~ 20% of the total ash produced. Ash is only partially used as a substitute for lightweight aggregates, and most of the ash is buried in its own landfill. Although 6 million tons of coal ash are generated annually in Korea, the recycling rate has gradually decreased since 2003, and about 30% of the amount generated is simply landfilled in the ash processing plant. However, even ash ponds are saturated and urgently needed to expand and secure new treatment plants.However, due to various complaints and environmental issues, the construction and expansion of ash treatment plants are becoming increasingly difficult. Technology development and dissemination is an urgent problem.

  Waste gypsum is desulfurized gypsum produced as a by-product after removing SOx from thermal power plants and various industrial processes, phosphate gypsum generated as a by-product from fertilizer industry, fluoric acid gypsum generated as a by-product from the production of folic acid, and as a by-product from the titanium manufacturing process. It can be classified as titanium gypsum, etc., and it has more output than domestic demand, and most of them are left unattended or left unattended. In particular, waste phosphate gypsum is generated millions of tons of strong acidic waste per year, and huge amounts are not recycled, which has caused social problems due to heavy metals and leachate.

Waste lime is a strong alkaline substance produced in most chemical plants in Busan lime, which is produced in the manufacturing process of soda ash, and only a part of it is recycled. Because of this, there is a possibility that it may adversely affect the environment and soil, such as aesthetics, scattering dust, heavy metals, leachate, etc., it is considered to be an object to be treated.

Inorganic sludge, inorganic solid soil and inorganic wastes are generated millions of tons per year during industrial activities, and they are reused in large quantities, but they are still landfilled or left unattended for simple use or economic reasons. It spoils the beauty and pollutes the surrounding environment. Therefore, it can be a useful resource if it is reused after proper treatment depending on the purpose.

Paper ash and fly ash (fly ash) are very useful industrial by-products that can be a useful resource for waste or reuse if they are known as by-products from incineration or burning coal sludge, respectively.

In particular, sewage sludge incineration is a by-product generated after incineration of sewage sludge by the current waste management law, and recycling remains an important issue. There the sewage sludge incineration ash is SiO _2, Al ₂ O _3, Fe ₂ O ₃ is the account for over 80% of all the structural material, in particular SiO ₂ and Fe ₂ O ₃ component occupies a relatively high ratio, SiO ₂ is Sewage It is considered that soil and sand are mixed in rainwater flowing into the treatment plant, and Fe ₂ O ₃ is believed to be due to iron chloride or iron sulfate used as a flocculant and a dehydration aid. Unlike general waste incinerators, sewage sludge incinerators are not high in heavy metal content or elution and have relatively uniform characteristics in particle size distribution and chemical composition, so they can be reused in the same way as coal ash, which has similar composition to that of ordinary clay. have.

The present invention secures industrial by-products such as dredged soil which is continuously increased due to expansion of large-scale port facilities, maintenance of routes, dredging of contaminated seas, landfill coal which is not recycled in large quantities every year, and abandoned waste gypsum and waste lime, etc. The purpose of the present invention is to provide a coarse surface landfill composition using dredged soil and industrial by-products that can be solidified and efficiently recycled into landfills and waste salt recycled landfills in coastal large-scale reclamation projects.

In addition, the present invention solves the difficulties of land transportation by drying and solidifying waste such as high-level soil in a short time by using the waste resources without using a separate energy source, and at the same time do not damage the landfill soil that is insufficient without damaging the natural environment It is another object of the present invention to provide a method for preparing covalent surface landfill compositions which can be supplied immediately in an economical manner.

In order to achieve the above object, according to the features of the present invention, the present invention is generated by projects such as harbor construction, route dredging and dredging sea area
100% by weight of a mixture of 60% by weight of dredged soil and 40% by weight of inorganic sludge crushed to less than 10 mm in diameter in dredged soil and coarse-water landfill soil composition using dredged soil and industrial by-products, or dredged soil 100% by weight of a mixture of 1: 1 and landfilled lime, or 40% by weight of dredged earth and 40% by weight of landfilled coal, and 1: 1 mixture of waste gypsum and waste lime, crushed inorganic sludge, inorganic solidified soil and inorganic waste materials. To 100% by weight of the primary mixture, in which 20% by weight of any one of these or a mixture thereof is mixed,
25 ~ 40 wt% of paper ash incinerated at 850 ~ 1,000 ℃ as a solidification aid
25 to 40% by weight of coal ash (fly ash) with a moisture content of less than 1%,
20 ~ 30% by weight of sewage sludge incineration with less than 1% water content,

5 to 10% by weight of light borodolite or 5 to 10% by weight of a mixture of light dollomite and quicklime in a 2: 1 weight ratio, or 3 to 7% by weight of cement or 5 to 7% by weight of blast furnace slag powder. Further comprises a mixture of ˜3% by weight,

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This is about coarse surface landfills manufactured to be used as recycled landfills such as coastal area recovery materials and landfills after uniformly mixing and solidifying them, and solving the shortcomings of landfills in an economic way by using waste materials. Dredged soil, which is difficult to handle due to high moisture content, and landfilled coal, waste gypsum and waste lime 1: 1 mixture, inorganic sludge, inorganic solidified soil, inorganic The present invention relates to a coarse surface landfill composition using environmentally-friendly dredged soil and industrial by-products that can process industrial by-products such as waste materials, paper ash, fly ash, and sewage sludge incineration in a short time.

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The shared surface landfill of the present invention prepared by the method according to the solution of the above problem can drastically reduce the drying time of high-functional dredged soil that takes months to years only natural drying time in the dredged soil dumping site, a huge budget is required Prevent the construction of additional dredged dump sites that threaten marine ecosystems.

In addition, by immobilizing harmful substances such as heavy metals contained in dredged soil and waste gypsum using pozzolanic and hydration reactions, it reduces the environmental load such as suppressing elution and compresses by using landfill coal and inorganic materials in which fine and granulated powder are mixed. The mechanical properties of dredged soils, including strength, can be improved to enable large-scale recycling. At the same time, by neutralizing the strong alkaline waste lime and strong acid waste gypsum, it is possible to use the wastes as artificial soils and prevent the environmental damage to secure landfill soil by using waste resources. It is possible to solve the shortage problem of coastal shared landfill soil and sedimentary ashes at a cost.

Hereinafter, a detailed description for carrying out the coarse surface landfill composition using dredged soil and industrial by-products according to the present invention and a method of manufacturing the same will be described.

The dredged soils mentioned throughout this specification are dredged soils generated by projects such as port construction, route dredging and dredging of contaminated areas, and sewage soils generated during the maintenance and management of sewage pipes, such as combined sewer pipes, storm water pipes, and sewage pipes. Includes.

Inorganic sludge referred to throughout this specification means that the sludge in a dehydrated cake state is pulverized to 10 mm or less to facilitate mixing and reaction.

As used throughout this specification, '%' means weight percent unless otherwise noted.

The landfill soil composition according to the present invention uses dredged soil and industrial by-products to suppress the release of harmful substances and to improve the strength and quality so as to be useful as recycled soil materials such as large-scale earthworks or waste salt recovery soil such as coarse surface landfills. Various mixtures are used.

These mixtures include dredged soil, landfilled coal, waste gypsum, waste lime, inorganic sludge, inorganic solidified soil, inorganic wastes, paper ash, coal ash (fly ash), sewage sludge incineration, light borosilicate, quicklime, cement, blast furnace slag. Fine powders and coagulants are used.

In addition, functional additives such as heavy metal removers may be further used if necessary.

Composition

Hereinafter, each composition will be described in more detail.

At this time, the content range of each composition described below is an optimum range for maximizing each effect obtained when using each composition and the synergy effect obtained by mixing with other compositions. Not get

The recycled soil material composition according to the present invention is prepared with dredged soil, landfill coal, inorganic sludge, inorganic waste, paper ash, coal ash (fly ash), sewage sludge incinerator as main components.

The dredged soil is used in combination with inorganic sludge or landfilled lime, and in another method, a mixture of waste gypsum and waste lime 1: 1 mixture, inorganic solidified soil, and inorganic waste materials are used. Specifically, the dredged soil is mixed with crushed inorganic sludge, mixed with dredged soil and landfill coal, dredged soil, landfill coal, waste lime and waste plaster 1: 1 mixture, inorganic sludge, inorganic solid soil and inorganic waste materials. It is preferable to use. In some cases, if dredged soil is scarce, it is also possible to use a mixture of landfilled coal, waste lime and waste gypsum 1: 1, inorganic sludge, inorganic solidified soil, and inorganic waste.

More specifically, the dredged soil is used by mixing 60% by weight of dredged soil and 40% by weight of inorganic sludge in the cake state when mixed with inorganic sludge, or when the mixed dredged soil and landfilled lime 1: 1 Mix with and use. In case of using dredged soil, landfilled coal, inorganic sludge, inorganic solidified soil and inorganic waste materials, 40% by weight of dredged soil, 40% by weight of landfilled coal, inorganic sludge and inorganic solidified soil, and inorganic waste materials 20% by weight of one or a mixture thereof is used in combination. In addition, when only dredged soil is used and landfilled coal, inorganic sludge, inorganic solidified soil, and inorganic waste materials are mixed, any one of inorganic sludge, inorganic solidified soil, and inorganic waste materials is contained in 60% by weight of landfilled coal. 40 weight% of these mixtures are used in mixture. In this way, a primary mixture is prepared.

At this time, inorganic sludge is manufactured and processed in earthenware, porcelain, refractory, cement, concrete, stone products, three wheel facilities at construction sites, water purification facilities for water works, nonmetallic mineral grinding facilities (including drilling facilities) or earth and sand. Inorganic sludge from washing facilities, dehydrated and dried with less than 70% water content.

Inorganic solidified soil refers to inorganicized solidified or solidified organic sludge such as sewage and wastewater sludge using inorganic solidifying agents such as cement or quicklime.

Inorganic wastes are inorganic construction wastes (inorganic wastes except metals from the construction site from the start of construction to completion of construction), slag, dust, briquettes, clay, clay foundry sand and waste refractory (workplace). General wastes only), waste stone (including waste stone) from stone processing or bentonite manufacturing process, waste ready-mixed concrete, appeal and sewage sludge generated from ready-mixed concrete manufacturing process or returned from construction site. A painting or molten slag.

With respect to 100% by weight of the primary mixture, in the present invention, 25 to 40% by weight of paper ash ash incinerated at 850-1,000 ° C., and the coal ash generated when burning coal dust at a high temperature of about 1,400-1,500 ° C. in a thermal power plant 25 to 40% by weight of coal ash (fly ash) collected from the dust collector, 20 to 30% by weight of sewage sludge incinerator as auxiliary solidifying agent, and 5 to 10% by weight of light borodolite calcined at 750 to 1,000 ° C or light dollomite and 900 to 1,100 5 to 10% by weight of a mixed additive obtained by mixing the quicklime calcined at 2 ° C. in a 2: 1 ratio, or 3 to 7% by weight of cement or 5 to 7% by weight of blast furnace slag powder, 0.5 to 3% by weight of a coagulant accelerator Additives are used as solidifying agents.

The paper ash is a pozzolanic substance having an active calcium oxide (CaO) content of 40 wt% or more, which is latent hydrophobic and has an excellent water absorption rate, which helps to reduce the water content of the dredged soil and contributes to the strength expression of the landfill soil.

The coal ash (fly ash) refers to fine particles that are rapidly cooled by melting ash in coal when coal is burned at a high temperature in a furnace in a coal-fired power plant. Calcium ion of calcium hydroxide produced in the reaction with silicon oxide or aluminum oxide eluted from itself reacts to form an insoluble hydrate (Ettringite) and solidifies for a long time to play a role in enhancing strength.

The sewage sludge incineration ash helps to create a water-insoluble silicate compound during the hydration reaction more components of the coal ash and the mineral composition does not affect the reaction similar to the sign language in particular silica (SiO _2).

The small dolomite is a slag of dolomite, a carbonate mineral, at 900-1,000 ° C., and 32-35% by weight of magnesium oxide (MgO) and 50-55% by weight of calcium oxide (CaO) in the total constituents of the dolomite. It can be used as a useful substitute for expensive quicklime and serves as a source of calcium ions needed for pozzolanic reactions of fly ash, which is lacking in paper ash alone. Dolomite causes endothermic reactions to decompose, and the decomposition of MgCO ₃ and CaCO ₃ at different temperatures is as follows.

750 ~ 800 ℃ CaMg (CO ₃ ) ₂ = CaCO ₃ + MgO + CO ₂ ↑

900 ~ 1000 ℃ CaCO ₃ + MgO = CaO + MgO + CO ₂ ↑

The fine powder small dolomite of 10 mm or less used in the present invention helps to rapidly lower the water content of the dredged soil because the hydration reaction proceeds rapidly in a short time when contacted with moisture.

The quicklime (生石灰) is a material produced when the limestone or calcium carbonate (CaCO ₃ ) is heated to about 900 ℃ or more to meet the moisture in the dredged soil to form calcium hydroxide with an exothermic reaction. CaO + H ₂ O → Ca (OH) ₂ + 15.2 kcal / kg

At this time, due to the exothermic reaction of 100 ° C. or higher, the water content is lowered as the water vaporizes into water vapor, and is also used to reform the sludge and reinforce the soft ground. For economic reasons, it is preferable to use a mixture with light bovine dolomite rather than alone.

The blast furnace slag powder is discharged when the iron ore is melted at a high temperature in a steelworks furnace, separated into heavy iron and slag, which is a remaining rock component. The slag flows out of the furnace like volcanic lava. When it is sprayed with high pressure water to cool, it rapidly cools and breaks into small particles in the form of sand. Finely pulverizing these small particles to the size of cement particles in a grinder is called blast furnace slag fine powder.

The fine powder has a property of hardening like cement when reacted with water. Because of this property, blast furnace slag fine powder is used as a cement substitute. In addition, blast furnace slag powder is an economical material that is very inexpensive compared to cement because the by-product is a raw material.

The coagulation accelerator is used to compensate for the shortcomings that the blast furnace slag powder has a low coagulation rate compared with cement (Portland cement), so that the initial strength is low and there are many microcracks. As a coagulant (alkali stimulant), NaOH, Na ₂ SiO ₃ , Na ₂ SO ₄ , Na ₂ CO _3, etc. may be used, but in the present invention, Na ₂ SO ₄ is used.

Manufacturing method

Hereinafter, with reference to the accompanying drawings will be described a method for producing a recycled landfill composition of the present invention. 1 is a flow chart illustrating a method of manufacturing recycled landfill material using dredged soil and industrial by-products according to the present invention, and FIG. 2 is a view listing the names of the mixtures used in the method of manufacturing recycled landfill material using dredged soil and industrial by-products according to the present invention.

In Figure 1, the recycled fill material produced by using dredged soil and industrial by-products

(S1) a first grinding step of grinding the inorganic sludge in the cake state to a diameter of 10mm or less;

(S2) 60% by weight of dredged soil and 40% by weight of the inorganic sludge, a mixture of dredged soil and landfill with a 1: 1 mixture, or 40% by weight of dredged soil and 40% by landfill, waste gypsum and waste lime A second mixing step of preparing a first mixture of any one of a mixture, an inorganic solidified soil, an inorganic sludge, and an inorganic waste material, or 20% by weight of a mixture thereof;

(S3) 25 to 40% by weight of paper ash, 25 to 40% by weight of coal ash (fly ash), and 20 to 30% by weight of sewage sludge ash as a solidification aid for the first mixture to prepare a second mixture. Third mixing step;

(S4) 5 to 10% by weight of light borodolite or 5 to 10% by weight of light borodolite and quicklime 2: 1 mixture with respect to the second mixture, cement 3 to 7% by weight or blast furnace slag powder 5 to 7 A fourth mixing step of preparing a third mixture by further mixing 0.5 to 3% by weight of a coagulant accelerator in the wt%;

(S5) The third mixture is prepared through a stabilization step of supplying the stabilization tank to promote and stabilize the hydration reaction.

First, in the step (S1), the inorganic sludge is dewatered using a dehydrator, and the first crushing step is crushed to 10 mm or less to react the sludge solidified in the cake state. At this time, the inorganic sludge is quantitatively transferred to the screw conveyor, and the grinder uses a continuous high speed rotary grinder without clogging.

Next, in step (S2), a mixture of 60% by weight of dredged soil and 40% by weight of inorganic sludge, a mixture of dredged soil and landfill with 1: 1, or 40% by weight of dredged soil and 40% by weight of landfill coal And a second mixing step of preparing a first mixture of a waste lime 1: 1 mixture, an inorganic solidified soil, an inorganic sludge, and an inorganic waste mixture, or a mixture of 20 wt% of these mixtures. At this stage, waste gypsum and waste lime can be hardened by heating while neutralizing when mixed in the presence of water. Therefore, the mixture is pre-mixed and used to make completely neutralized powder or stored in each hopper independently. After separate metering at 1: 1, it is preferred to mix with the mixtures.

Next, in the step (S3), 25 to 40% by weight of paper ash and 25 to 40% by weight of coal ash (fly ash), and 20 to 30% by weight of sewage sludge ash as a solidifying aid for the first mixture transferred to the belt conveyor. To perform a third mixing step to prepare a second mixture by mixing. In this step, the paper ash, coal ash and sewage sludge incineration materials are fine particles (dust), and thus, in order to facilitate mixing, the paper ash, coal ash and sewage sludge incineration materials are preferably mixed and transferred to the screw conveyor to be mixed with the first mixture.

Next, in step (S4), 5 to 10% by weight of hard dollomite or 5 to 10% by weight of light sorbite and quicklime 2: 1 mixture are mixed with the hardener for the first mixture transferred to the belt conveyor, or cement 3 ~. A fourth mixing step of preparing a third mixture is performed by mixing 0.5 wt% to 3 wt% of the coagulant accelerator with 7 wt% or 5-7 wt% of the blast furnace slag powder.

Next, in step (S5), the third mixture is supplied to the stabilization tank to prepare a co-surface landfill soil including a stabilization step to promote and stabilize the hydration reaction and the pozzolanic reaction.

The final mixture prepared in this way can be immediately used as recycled landfill material for various coastal areas including co-surface landfill soil without any subsequent process.

Usage

The public water surface reclaimed soil prepared through the above steps is used for reclaiming various coastal areas such as reclaiming of harbor sites, reclaiming industrial complexes, improving seabed lipids, creating artificial tidal flats, reclaiming wastewater, forming coastal wetlands, and improving wetland topsoil. And it can be used as landfill recycled landfill. In addition, if the salt is removed, it can be used for civil engineering and building construction recycled land materials as well as general land materials, but it is inevitable for unnecessary expenses, so it is desirable to use it only in areas where salt damage measures have been established or irrelevant to salt damage. .

Although specific embodiments of the present invention have been described and illustrated above, it is obvious that the present invention may be variously modified and implemented by those skilled in the art. Such modified embodiments should not be individually understood from the technical spirit or the prospect of the present invention, and such modified embodiments should fall within the scope of the appended claims.

( Example 1 To 12)

The present invention as described above will be described in more detail with reference to Examples. First, the dredged soil, landfill coal, waste gypsum and waste lime 1: 1 mixture, inorganic sludge, inorganic solidified soil, and inorganic waste materials are mixed in the following mixing ratios to prepare a primary mixture, and the solidifying aid is made of paper ash and coal ash. (Fly Ash), sewage sludge incineration ash solidifying agent was prepared by mixing the small borosilicate, light borosilicate and quicklime 2: 1 mixture, cement, blast furnace slag powder and coagulant in the following mixing ratio, respectively, to prepare a secondary mixture.

Each secondary mixture corresponding to 100% by weight of the primary mixture was sequentially introduced into a high speed rotary mixer to prepare a co-surface landfill soil.

The dredged soil was collected to grasp the state of ocean quality in the nearby waters of K city in Korea, the landfill coal was from the coal ash processing plant of S thermal power plant in Korea, the waste gypsum was from domestic N company, the waste lime was domestic D company, and inorganic sludge Is domestic B water purification plant, inorganic solid soil is domestic N company, inorganic waste is domestic C steel company, paper ash is domestic P company, coal ash (fly ash) is domestic K energy, and sewage sludge incinerator is domestic A municipal sewage sludge Incinerators, light bovine dolomite and quicklime were used by domestic company D, cement and blast furnace slag powder by domestic company S and coagulation accelerators by domestic company P.

The composition of the mixture used is as shown in [Table 1], and the test is carried out according to the circulating aggregate quality standards established by the Ministry of Land, Transport and Maritime Affairs in Table 2 and the toxic substance dissolution standards specified in the Waste Management Act of Table 3. The results are as follows.

Covalent landfill landfill composition (unit: wt%) Sample Name Example
One Example
2 Example
3 Example
4 Example
5 Example
6 Dredge 60 60 60 60 50 50 Landfill Coal 50 50 Waste Gypsum + Waste Lime 1: 1 Mixture Inorganic sludge 40 40 40 40 Inorganic Goat Soil Inorganic Wastes
Solidifying aids
Paper ash 20 20 20 20 20 20 Fly Ash (F / A) 20 20 20 20 20 20 Sewage Sludge Incinerator 15 15 15 15 15 15
Solidifying agent

Light small dolomite 7 7 Light Dolomite + Quicklime 7 7 cement 5 Blast Furnace Slag Powder + Condensation Accelerator 5

Sample Name Example
7 Example
8 Example
9 Example
10 Example
11 Example
12 Dredge 50 50 40 40 40 40 Landfill Coal 50 50 40 40 40 40 Waste Gypsum + Waste Lime 1: 1 Mixture 5 5 5 5 Inorganic sludge 5 5 5 5 Inorganic Goat Soil 5 5 5 5 Inorganic Wastes 5 5 5 5
Solidifying aids
Paper ash 20 20 20 20 20 20 Fly Ash (F / A) 20 20 20 20 20 20 Sewage Sludge Incinerator 15 15 15 15 15 15
Solidifying agent

Light small dolomite 7 Light Dolomite + Quicklime 7 cement 5 5 Blast Furnace Slag Powder + Condensation Accelerator 5 5

Quality Standard for Filled Recycled Aggregate division Lower part within 100cm from the top of the pile Lower than 100 cm from the top of the stack Test Methods Maximum dimension (mm) 100 or less 100 or less - Modified CBR over 10 2.5 or more KS F 2320 5.0mm sieve passage rate (%) 25-100 - KS F 2502 0.08mm sieve passage rate (%) 0-25 - KS F 2301, KS F 2309 Plasticity index below 10 - KS F 2303 Dry density after compaction (t / m ³ ) - 1.5 or more KS F 2312 Foreign substance content (%)
(Organic foreign matter) 1.0 or less (volume) KS F 2576

Ministry of Land, Transport and Maritime Affairs Technical Standard and Recycled Aggregate Quality Standard (2009.06)

 Hazardous Substance Dissolution Criteria According to Waste Process Test Method (Heavy Metal Dissolution Test) Test Items unit Designated Waste Standard Test Methods Pb mg / l 3 Waste Process Test Method Cu mg / l 3 〃 As mg / l 1.5 〃 Hg mg / l 0.005 〃 CD mg / l  0.3 〃 Cr ⁶⁺ mg / l 1.5 〃 CN ^- mg / l One 〃 Organic mg / l One 〃 Tetrachloroethylene mg / l 0.1 〃 Trichloroethylene mg / l 0.3 〃 Oil mg / l 5% 〃

Waste Management Act Enforcement Rule (Appendix 1)

The results of the above Examples of Table 1 are shown in Table 4 below. In the co-surface landfill soil of the present invention, it can be seen that Examples 1 to 12 completely satisfy the quality standards for fill aggregates. Dredged soil, which has a very high water content, is a landfill soil in itself, and is very difficult to use. Therefore, proper moisture control process is essential, but the conventional simple natural drying method is not only time-consuming, expensive, and expensive, but also simple natural drying, so that the bond between silt and viscous dredged soil is very low to ensure stability. It's a tough situation. When using the industrial by-products of the present invention is shown in the following examples that can solve the economic problems that are the biggest obstacle of dredged soil recycling, and can solve the severe shortage of landfill materials in coastal civil engineering. The following [Table 4] and [Table 5] are the test results of Example 9 of [Table 1] and [Table 1] above all the standard value, and the heavy metal elution result is also good, it is found that there is no abnormality in quality and environment. Can be.

Test results of covalent landfill soil composition

Test Items
Test result
Test Methods
Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 Density (g / cm 3) 2.533 2.539 2.522 2.532 2.579 2.578 KS F 2308-'06 Liquid limit (%) NP NP NP NP NP NP
KS F 2303-'00
Firing limit (%) NP NP NP NP NP NP Plasticity index (%) NP NP NP NP NP NP Particle size (mm) 8.18 9.68 8.37 9.04 11.93 10.76


KS F 2302-'02



60% particle size (mm) - - - - - - 10% particle size (mm) - - - - - - Uniformity factor 5.5 5.7 5.4 5.4 5.6 5.5 5.0mm sieve passage rate (%) 95.6 96.4 95.6 93.8 72.3 74.0 2.0% sieve passage rate (%) - - - - - - 0.425mm sieve passage rate (%) - - - - - - 0.08mm sieve passage rate (%) 20.25 19.3 21.6 19.4 11.7 14.2 Foreign substance content (%) 0.0 0.0 0.0 0.0 0.0 0.0 KS F 2576-'06 Maximum Wet Density (g / cm 3) - - - KS F 2312-'01
Compaction Method Db
Maximum dry density (g / cm 3) 1.701 1.806 1.914 1.773 2.108 2.111 Optimal function ratio (%) 27.0 31.6 29.2 29.9 16.6 17.2

Test Items
Test result
Test Methods
Example 7 Example 8 Example 9 Example 10 Example 11 Example 12 Density (g / cm 3) 2.571 2.575 2.508 2.511 2.522 2.503 KS F 2308-'06 Liquid limit (%) NP NP NP NP NP NP
KS F 2303-'00
Firing limit (%) NP NP NP NP NP NP Plasticity index (%) NP NP NP NP NP NP Particle size (mm) 11.65 12.01 9.52 13.03 12.88 13.54


KS F 2302-'02



60% particle size (mm) - - - - - - 10% particle size (mm) - - - - - - Uniformity factor 5.3 5.4 5.6 5.4 5.7 5.7 5.0mm sieve passage rate (%) 78.6 74.5 79.6 81.8 80.5 80.1 5.0mm sieve passage rate (%) - - - - - - 0.425mm sieve passage rate (%) - - - - - - 0.08mm sieve passage rate (%) 17.4 15.3 11.5 14.7 14.3 16.7 Foreign substance content (%) 0.0 0.0 0.0 0.0 0.0 0.0 KS F 2576-'06 Maximum Wet Density (g / cm 3) - - - KS F 2312-'01
Compaction Method Db
Maximum dry density (g / cm 3) 2.009 2.201 2.001 1.922 20.18 2.100 Optimal function ratio (%) 18.5 18.1 19.5 21.3 21.9 19.9

Test Items unit Designated waste
standard result Test Methods Pb mg / l 3 Not detected Waste Process Test Method Cu mg / l 3 0.710 ″ As mg / l 1.5 0.010 ″ Hg mg / l 0.005 Not detected ″ CD mg / l  0.3 Not detected ″ Cr ⁶⁺ mg / l 1.5 Not detected ″ CN ^- mg / l One Not detected ″ Organic mg / l One Not detected ″ Tetrachloroethylene mg / l 0.1 Not detected ″ Trichloroethylene mg / l 0.3 Not detected ″ Oil mg / l 5% 0.070 ″

(Other Example  1-8)

The present invention as described above will be described by another embodiment as follows. 60 wt%, 20 wt%, 10 wt%, 5 wt% of the dredged soil, landfilled coal, waste gypsum and waste lime 1: 1 mixture, inorganic sludge and inorganic solidified soil except the first inorganic wastes Four identical mixtures were prepared by mixing at 5% by weight. Four secondary mixtures were prepared in the same manner by mixing 20% by weight of paper ash, 20% by weight of coal ash (fly ash), and 10% by weight of sewage sludge ash with respect to 100% by weight of each primary mixture. As a solidifying agent, 7% by weight of light borodolite, 7% by weight of light borodolite and quicklime 2: 1 mixture, 7% by weight of cement, 7% by weight of blast furnace slag powder and a coagulant accelerator were respectively prepared as a solidifying agent. . Four secondary mixtures were uniformly mixed with each of the four primary mixtures to prepare four tertiary mixtures, and then four prepared solidifying agents were separately added to the high-speed rotary mixer and four shared landfill soils ( Examples 1,3,5,7) were prepared.

The composition ratio of the second dredged soil, landfilled coal, waste gypsum and waste lime 1: 1 mixture, inorganic sludge, inorganic solidified soil, and inorganic wastes in the order of 40% by weight, 40% by weight, 5% by weight, 5% by weight, Four identical mixtures were prepared by mixing 5% by weight and 5% by weight. Four secondary mixtures were prepared in the same manner by mixing 20% by weight of paper ash, 20% by weight of coal ash (fly ash), and 10% by weight of sewage sludge ash with respect to 100% by weight of each primary mixture. Then, as a solidifying agent, 7% by weight of light borodolite, 7% by weight of light borodolite and quicklime 2: 1 mixture, 7% by weight of cement, 7% by weight of blast furnace slag powder and a coagulant accelerator were prepared with respect to 100% by weight of the primary mixture. Four secondary mixtures were uniformly mixed with each of the four primary mixtures to prepare four tertiary mixtures, and then four prepared solidifying agents were separately added to the high-speed rotary mixer and four shared landfill soils ( Examples 2, 4, 6, 8) were prepared. At this time, each composition used is as shown in the following [Table 6].

Covalent landfill landfill composition (unit: wt%) Sample Name Example
One Example
2 Example
3 Example
4 Example
5 Example
6 Example
7 Example
8 Dredge 60 40 60 40 60 40 60 40 Landfill Coal 20 40 20 40 20 40 20 40 Waste Gypsum + Waste Lime 1: 1 Mixture 10 5 10 5 10 5 10 5 Inorganic sludge 5 5 5 5 5 5 5 5 Inorganic Goat Soil 5 5 5 5 5 5 5 5 Inorganic Wastes 5 5 5 5 Solidification
Supplements
Paper ash 20 20 20 20 20 20 20 20 Fly Ash (F / A) 20 20 20 20 20 20 20 20 Sewage Sludge Incinerator 15 15 15 15 15 15 15 15
Solidifying agent

Light small dolomite 7 7 Light Dolomite + Quicklime 7 7 cement 7 7 Sue slag powder +
Condensation accelerator 7 7

The physical properties of the covalent surface landfill composition prepared in Example were measured, and the results obtained based on Experimental Example 1 are shown in the following [Table 7].

At this time, general earth and sand were used as Comparative Example 1.

division Moisture content (%) Uniaxial compressive strength (kg / cm ² ) Fix CBR Organic matter content (%) Example 1 41.4 5.04 19.5 6.01 Example 2 35.6 5.23 24.7 5.41 Example 3 39.4 5.11 20.4 6.44 Example 4 32.9 5.16 22.5 5.80 Example 5 38.8 6.14 18.9 6.93 Example 6 30.2 6.03 23.9 6.84 Example 7 40.4 5.81 19.1 5.85 Example 8 37.1 5.74 22.4 6.71 Comparative Example 1 34.6 4.87 18.2 1.34

Experimental Example 1

Water content test

Based on the method for measuring moisture and solids in the waste process test method, the basis weight bottle or evaporating dish is dried for 1 hour at 105 to 110 ° C in advance, and then cooled in a sulfuric acid desiccator and weighed precisely with a constant weight (W ₁ ). Take the basis weight or weigh the sample (W ₂ ) of the evaporating dish and sample accurately. Next having almost to blow water in the water bath was tested weighed to put in the cooling was 4 hours drying in the dryer at 105~110 ℃ decitex sulfate and then locator and a constant weight is precisely weighed the weight (W _3).

       Calculation

Moisture (%) = (W ₂ -W ₃ ) / (W ₂ -W ₁ ) × 100

% Solids = (W ₃ -W ₁ ) / (W ₂ -W ₁ ) × 100

Uniaxial compressive strength test

A test for measuring the compressive strength of soil by compressing it in the lateral direction without applying lateral pressure to cylindrical specimens in the columnar or columnar shape.The specimens are made of cylindrical specimens and are not subjected to side pressure according to KS F 2314: 2001. The test was carried out by adding (1% / min) to the compressive strength tester at.

Modified CBR Exam

Refers to the CBR corresponding to the degree of compaction defined as an index indicating the quality standards for base and auxiliary base materials or fill material. The compaction test was conducted according to KS F 2312: 2001 (Compact method Db). Tested according to KS F 2320: 2000.

Organic matter content test

The basis of a platinum, ignition quartz, or porcelain crucible or a plate in advance at 600 ± 25 ℃ 30 minutes in a loss on ignition and the organic content measurement method of waste process test method, and the reaction mixture was allowed to cool in a desiccator sulfate, and then the weight (W ₁₎ Accurately weigh the sample (20 g or more) and weigh the crucible or dish and sample (W ₂ ) correctly. 25% ammonium nitrate solution was added to the sample, and the sample was slowly heated, carbonized, and then heated in an electric furnace at 600 ± 25 ° C. for 3 hours, cooled in a sulfuric acid desiccator, and weighed accurately (W ₃ ).

       Calculation

Ignition loss (%) = (W ₂ -W ₃ ) / (W ₂ -W ₁ ) × 100

       Organic matter content (%) = [volatile solids (%) / solids (%)] × 100

                    Volatile solids (%) = loss of ignition (%)-moisture (%)

1 is a flow chart showing a method of manufacturing covalent surface landfill using dredged soil and industrial by-products in accordance with the present invention.

Figure 2 is a view showing the name of the mixed additives used in the manufacturing method of coarse surface landfill using dredged soil and industrial by-products in accordance with the present invention.

Claims (8)

100% by weight of a mixture of 60% by weight of dredged soil and 40% by weight of inorganic sludge crushed to less than 10 mm in diameter in dredged soil and coarse-water landfill soil composition using dredged soil and industrial by-products, or dredged soil 100% by weight of a mixture of 1: 1 and landfilled lime, or 40% by weight of dredged earth and 40% by weight of landfilled coal, and 1: 1 mixture of waste gypsum and waste lime, crushed inorganic sludge, inorganic solidified soil and inorganic waste materials. To 100% by weight of the primary mixture, in which 20% by weight of any one of these or a mixture thereof is mixed, 25 ~ 40 wt% of paper ash incinerated at 850 ~ 1,000 ℃ as a solidification aid 25 to 40% by weight of coal ash (fly ash) with a moisture content of less than 1%, 20 ~ 30% by weight of sewage sludge incineration with less than 1% water content, 5 to 10% by weight of light borodolite or 5 to 10% by weight of a mixture of light dollomite and quicklime in a 2: 1 weight ratio, or 3 to 7% by weight of cement or 5 to 7% by weight of blast furnace slag powder. Co-surface landfill composition using a dredged soil and industrial by-products, characterized in that it further comprises a mixture consisting of ~ 3% by weight. The method of claim 1, The dredged soil includes dredged soils generated by the construction and maintenance of ports, dredging and repair of contaminated seas, and sewerage sediments such as combined sewer pipes, storm sewers, and sewage pipes. A landfill coal containing bottom ash and fly ash embedded in a coal ash processing plant of a power plant, wherein the inorganic sludge is manufactured and processed in earthenware, porcelain, refractory, cement, concrete, stone products, and three-wheel facility at a construction site; Inorganic sludge from water purification facilities, non-metallic mineral crushing facilities (including drilling facilities) or earth and sand washing facilities for water supply business, and the coarse water surface reclaimed soil composition using dredged soil and industrial by-products, which is dehydrated and dried to less than 70% water content. . The method of claim 1, The waste gypsum refers to phosphate gypsum as a by-product of fertilizer plant, titanium gypsum as a by-product of titanium manufacturing plant, flue gas desulfurization gypsum as a by-product of desulfurization facility of thermal power plant and fluoric acid gypsum as a by-product of folic acid manufacturing plant. Covalent surface landfill composition using dredged soil and industrial by-products, characterized in that the waste lime generated as a by-product. The method of claim 1, The inorganic solidified soil refers to inorganicized by solidifying or solidifying organic sludge, such as sewage and wastewater sludge, using an inorganic solidifying agent composed of cement or quicklime. In addition, the inorganic wastes are inorganic construction wastes (inorganic wastes except metals from the construction site from construction to completion due to construction work), slag, dust, briquettes, clay, clay, foundry sand, waste refractories. (Only general waste in the workplace), waste stone (including waste stone) from stone processing or bentonite manufacturing process, waste ready-mixed concrete, appeal and sewage sludge generated from ready-mixed concrete manufacturing process or returned from construction site Co-surface landfill composition using dredged soil and industrial by-products characterized in that it is ashed or molten slag. The method of claim 1, The paper ash refers to ash generated as a by-product after incineration of sludge in a paper mill, and the coal ash (fly ash) refers to solid ash that is scattered except heavy floor ash after burning coal, and the sewage sludge incinerator is dehydrated. Covalent surface landfill composition using dredged soil and industrial by-products, characterized in that after burning the sewage sludge of the cake state. The method of claim 1, The light dolomite is a carbonate mineral dolomite calcined at 900 ~ 1000 ℃ MgO (MgO) 32-35% by weight of the total constituents of the dolomite, calcium oxide (CaO) contains 50 to 55% by weight Said quicklime is calcined at 900 ~ 1,100 ° C, and the quicklime is shared by using dredged soil and industrial by-products, characterized in that the calcium oxide (CaO) content of the total constituents of the calcined limestone is 80% by weight or more. Sleep landfill composition. The method of claim 1, The cement refers to a common portland cement, the blast furnace slag powder refers to a fine powder prepared by crushing the crushed slag of the steelworks furnace by-products, and the coagulation accelerator is a powdery substance added to promote the coagulation rate of the blast furnace slag powder The co-surface landfill composition using dredged soil and industrial by-products, characterized in that any one of NaOH, Na ₂ SiO ₃ , Na ₂ SO ₄ and Na ₂ CO ₃ . delete

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