KR101068008B1 - Construction material using sludge and its manufacturing method - Google Patents

Abstract

The present invention relates to a building material using sludge and a method for producing the same, comprising sludge such as purified sludge, sewage sludge, wastewater sludge, sediment sludge, etc., and 60 to 95% by weight of the sludge and 5 to 40% by weight of the binder. 71.7%, O 20-86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2-68.7%, Ti 0.1-66.8% At least one compound selected from the group consisting of 10 to 90% by weight of mineral powder having an elemental composition ratio of 0.05 to 66.75%, Mn 0.05 to 66.75% and Fe 0.1 to 66.8%, and alkali metal chlorides and alkaline earth metal chlorides. Water containing less than 1% by weight of rare earth elements in a solution of at least one alkali metal and alkaline earth metal selected from the group consisting of alkali metals and alkaline earth metals in clustered water, based on the weight of the total clustered water And Comprising 10 to 90% by weight of the liquid binder mixed with a pH adjuster, preparing the sludge and the binder; Mixing the sludge and the binder; Injecting a mixture of the sludge and the binder into a mold; Applying vibration to the mold, and then press molding the mixture of sludge and binder; Dissolving the inorganic substances present in the sludge and forming the inorganic materials in the sludge by forming the solid materials after natural curing and solidifying after demolding → formation of aquasols → condensation → gel formation (gel) formation) Because strong binding force is exerted by the crystallization reaction, it is possible not only to manufacture building materials with a certain strength, but also to solve the problems caused by the use of cement. Without causing environmental pollution, heavy metals or pollutants contained in the sludge is strongly combined, there is no problem of secondary pollution, it is economical and can be manufactured in a simple way by performing natural curing.

Building materials, manufacturing method, inorganic binder, sludge

Description

Construction material utilizing sludge and its manufacturing method

The present invention relates to a building material using sludge and a method for manufacturing the same, and more specifically, composed of 60 to 95% by weight of sludge such as purified sludge, sewage sludge, wastewater sludge, sediment sludge and 5 to 40% by weight of the binder. The binder is C 5-71.7%, O 20-86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2 68.7%, 10 to 90% by weight of mineral powder having an elemental composition ratio of 0.1 to 66.8% of Ti, 0.05 to 66.75% of Mn, 0.05 to 66.75% of Fe and In 0.1 to 66.8%, and at least one selected from the group consisting of alkali metal chlorides and alkaline earth metal chlorides. 1 weight of the rare earth element is added to the weight of the total clustered water in a solution in which at least one compound is added to clustered water and eluted at least one alkali metal and alkaline earth metal selected from the group consisting of alkali metals and alkaline earth metals. % Only it consists of water with a pH control agent which contains as binder 10 to 90% by weight of a liquid mixture, comprising: preparing the sludge with the binder; Mixing the sludge and the binder; Injecting a mixture of the sludge and the binder into a mold; Applying vibration to the mold, and then press molding the mixture of sludge and binder; Dissolving the inorganic substances present in the sludge and forming the inorganic materials in the sludge by forming the solid materials after natural curing and solidifying after demolding → formation of aquasols → condensation → gel formation (gel) formation) Because strong binding force is exerted by the crystallization reaction, it is possible not only to manufacture building materials with a certain strength, but also to solve the problems caused by the use of cement. It does not cause environmental pollution, and heavy metals or contaminants contained in the sludge are strongly combined, so there is no problem of secondary pollution, and it is economical by performing natural curing and uses sludge that can be manufactured in a simple way. It relates to a building material and a manufacturing method thereof.

In general, sludge is an optimum sludge produced by spontaneous deposition on sewage and wastewater sludge, streams, lakes, and coasts, which are by-product wastewater sludge produced in the production of tap water, sewage and wastewater treatment plants. Among these slurries, sediment sludge is not as high as other sludges in recycling, but contains contaminants that are harmful to the human body. The purified water, sewage and wastewater sludges are by-products generated by the final flocculation and sedimentation during the treatment process. As a result, the water content is very high, the water is difficult to desorb and contaminated with heavy metals. In addition, it contains a large amount of organic matter easily decomposes naturally and gives off a bad smell, pollutes the surrounding environment and causes headaches and vomiting when inhaled.

The treatment of sludge as described above is mostly dependent on ocean dumping, incineration or simple landfill. However, in the case of ocean dumping, it is recognized as the main culprit of the deepening of marine ecosystem destruction. In addition, incineration causes social problems by releasing so-called highly toxic carcinogens such as dioxin, formaldehyde, and acrolein due to incomplete combustion, which is not suitable for the situation of Korea where energy resources are insufficient due to the high construction and maintenance costs. It is a way. Also, even in the case of landfill, it is difficult to secure landfill, and complaints related to leachate problems, pathogenic bacteria, eggs of pests, dust generation, odor occurrence, etc. are constantly raised and difficult to handle.

Many techniques for treating sludge by recycling such sludge have been studied. For example, many studies have been conducted on composting using sewage sludge, covering soil using sewage sludge, soil filling, ground reinforcement, land improvement and building materials as soil aggregates, and using cement as raw materials. It's happening.

Particularly, the use of building materials is described in Korean Patent No. 860017 "Soil Aggregate Composition for Civil Engineering and Building Materials Using Process Sludge and Sludge and Its Manufacturing Method", Patent No. 60441 "Method and Manufacturing System for Solidified Product Using Waste", Patent No. 450898 "Method for manufacturing fired construction materials using sewage sludge", Patent No. 812828 "Solidizer for solidifying sewage and wastewater sludge (Parafix) and cover material manufactured using it", Patent No. 757518 "Waste acid, waste alkali" And Sludge Treatment and Recycling Method ", Patent No. 490731" Method for Manufacturing Civil and Building Materials by Drying or Firing Waste Material Sludge in Rotary Kiln ", Patent No. 458876," Manufacturing Material for Recycling Textile Sludge " ", Patent No. 517230" Polymer raw material consisting of ocher, clay, clay and kaolin and a method for producing porous ceramics consisting of food waste, organic waste, industrial waste " , Patent No. 583763, "Method of Manufacturing Lightweight Aggregate Using Sewage Treatment Sludge," Patent No. 520463, "Method of Manufacturing Nonflammable Lightweight Building Finish Material Using Organic Sludge and Its Product", etc. .

However, conventional methods for manufacturing dry materials by recycling sludge have problems of eluting heavy metals as well as other pollutants from the manufactured products, causing secondary pollution, contaminating soil and the surrounding environment, and satisfactory strength of the manufactured products. Because it is not practical, its practical application is weak, and because a certain amount of cement is used, it causes environmental pollution problems due to the use of cement and environmental damage caused by carbon dioxide generated during cement production, and the manufacturing process is complicated, and it has to go through many pretreatment and manufacturing processes. There was a problem such as.

Accordingly, an object of the present invention is to be able to easily recycle the sludge and to produce a building material of a certain strength or more, and to solve the problems caused by the use of cement, and by using a binder composed only of inorganic material, there is no discharge of contaminants. Without causing pollution, heavy metals or contaminants contained in the sludge is strongly combined, there is no problem of secondary pollution, and by providing natural curing material to provide economical sludge.

Another object of the present invention is to provide a method for easily manufacturing a building material of the above object by a simple method.

In order to achieve the above objects as well as other objects that can be easily expressed in the present invention consists of 60 to 95% by weight sludge, such as purified sludge, sewage sludge, wastewater sludge, sediment sludge and 5 to 40% by weight binder The binder is C 5-71.7%, O 20-86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2 68.7% Selected from the group consisting of 10 to 90% by weight of mineral powder having an elemental composition ratio of 0.1 to 66.8%, Ti 0.05 to 66.75%, Fe 0.05 to 66.75%, and In 0.1 to 66.8%, and alkali metal chlorides and alkaline earth metal chlorides. The rare earth element is added to the weight of the total clustered water in a solution in which at least one compound is added to the clustered water to elute at least one alkali metal and alkaline earth metal selected from the group consisting of alkali metals and alkaline earth metals. W is composed of a first binder 10 to 90% by weight of the liquid phase a mixture of water and a pH adjusting agent containing less than% by weight, comprising the steps of preparing the sludge and a binder; Mixing the sludge and the binder; Injecting a mixture of the sludge and the binder into a mold; Applying vibration to the mold, and then press molding the mixture of sludge and binder; Dissolving the inorganic substances present in the sludge and forming the inorganic materials in the sludge by forming the solid materials after natural curing and solidifying after demolding → formation of aquasols → condensation → gel formation (gel) formation) Because strong binding force is exerted by the crystallization reaction, it is possible not only to manufacture building materials with a certain strength, but also to solve the problems caused by the use of cement. Without causing environmental pollution, heavy metals or pollutants contained in the sludge is strongly combined, there is no problem of secondary pollution, it is economical and can be manufactured in a simple way by performing natural curing.

The building material using sludge according to the present invention and its manufacturing method can be used to produce a building material of a certain strength or more because of the strong binding force, and can solve the problems caused by the use of cement, by using a binder composed only of inorganic materials There is no emission, which does not cause environmental pollution, and the heavy metals or pollutants contained in the sludge are strongly combined, so there is no problem of secondary pollution, and it is economical and can be manufactured in a simple way by performing natural curing. There is an effect.

The building material using the sludge according to the present invention is composed of sludge such as purified sludge, sewage sludge, wastewater sludge, sediment sludge, etc. 60 to 95% by weight and binder 5 to 40% by weight, the binder is C 5-71.7%, O 20 ~ 86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2-68.7%, Ti 0.1-66.8%, Mn 0.05-66.75% At least one compound selected from the group consisting of 10 to 90% by weight of mineral powder having an elemental composition ratio of 0.05 to 66.75% of Fe and 0.1 to 66.8% of Fe, and alkali metal chlorides and alkaline earth metal chlorides in clustered water To a solution eluting at least one or more alkali metals and alkaline earth metals selected from the group consisting of alkali metals and alkaline earth metals, wherein water containing less than 1% by weight of the rare earth element relative to the weight of the total clustered water is mixed with the pH adjusting agent. Liquid It characterized by consisting of a mixture of 10 to 90% by weight.

In addition, the method for manufacturing dry materials according to the present invention comprises 60 to 95% by weight of sludge such as purified sludge, sewage sludge, wastewater sludge, sediment sludge and 5 to 40% by weight of binder, but the binder is C 5 to 71.7%, O 20 -86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2-68.7%, Ti 0.1-66.8%, Mn 0.05-66.75 At least one compound selected from the group consisting of 10 to 90% by weight of mineral powder having an elemental composition ratio of%, Fe 0.05 to 66.75% and In 0.1 to 66.8% and an alkali metal chloride and an alkaline earth metal chloride is added to the clustered water. Mixing the pH control agent with water containing less than 1% by weight relative to the weight of the total clustered water in a solution in which at least one alkali metal and alkaline earth metal are eluted from the group consisting of alkali metals and alkaline earth metals A liquid grain Preparing a binder consisting of 10 to 90% by weight of the mixture; Mixing 60 to 95% by weight of the sludge and 5 to 40% by weight of the binder; Injecting a mixture of the sludge and the binder into a mold; Applying vibration to the mold, and then press molding the mixture of sludge and binder; It is characterized by consisting of a step of curing and natural curing after demolding.

The sludge used in the present invention may use at least one selected from the group consisting of purified sludge, sewage sludge, wastewater sludge and sediment sludge. It is effective to use a semi-dried or dried sludge, it is preferable to be dried in powder form rather than compressed and solidified, it is effective to use the crushed.

In addition, it is preferable that the sludge having at least a water content of less than 20% is not only effective in drying the manufactured materials to be manufactured, but also can reduce the strain after drying, and when used, the sludge particles are 50 to 325 mesh (mesh It is effective to use the one having a particle size of), and if the particle size is less than 50 mesh, there is a problem that the strength of the construction material to be manufactured is not satisfactory, and if it exceeds 325 mesh, the manufacturing cost is increased and it is not economical.

The mineral powder in the binder is C 5-71.7%, O 20-86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2- 68.7%, 0.1 to 66.8% of Ti, 0.05 to 66.75% of Mn, 0.05 to 66.75% of Fe, and one having an element composition ratio of In 0.1 to 66.8% are used.

It is preferable to use a mineral powder that does not contain heavy metals to harm the human body, and may contain trace elements in addition to the above components, some of which are not included or substituted with other components. Minerals can also be used. In addition, the elemental composition ratio of the mineral powder is not particularly limited, but C, O, Mg, Al, Si, S, Cl, and Ca must be included, and although the function of each element is not clearly identified, the above elements When each of these is not contained, the effect by this invention cannot be acquired.

The mineral powder is effective to use those having a particle size of 200 ~ 325 mesh (mesh), when the particle size is less than 200 mesh, there is a problem that the strength of the construction material to be manufactured is not satisfactory, if the excess exceeds 325 mesh It is not economic because of rising costs.

Meanwhile, alkali metal chlorides and alkaline earth metal chlorides refer to chlorides of Li, Na, K, Rb, Cs, Si, Al, Fe, Ca, Na, K, and Mg, and at least one of them should be used and clustered. The mineral particles form a colloidal solution by the purified water, and the formed colloidal solution combines with the minerals of the mineral powder to exhibit a function as a binder.

Normally, water is composed of about 35 water molecules, forming a very large cluster. When sulfur dioxide, carbon dioxide, carbon monoxide, and chlorine gas are dissolved in water, they are not only entangled between clusters of water molecules but also entangled. As it is dissolved in water, sulfuric acid, sulfurous acid, carbonic acid, and hydrochloric acid are acidified, and toxic heavy metals such as mercury, lead, cadmium, and aluminum are entangled in clusters. Such a large water cluster containing gas streams or toxic metals to acidify the water not only has a harmful effect on the human body, but also causes a decrease in the binding force in the present invention, thereby preventing the effect to be obtained in the present invention.

Therefore, in the present invention, the clusters of water molecules are subdivided into 5-6 molecules through far-infrared radiation, magnetization, ultrasonication, etc. in the range of 4-14 μm to blow toxic gases entangled between the clusters of water molecules into the air. Heavy metals are precipitated using clustered water with supernatant only.

The clustered water can be prepared by a variety of known methods, it is preferable to use a stabilized by a known stabilization method, there is a problem that the binding force of the binder is lowered when using the non-clustered water in the present invention.

At least one compound selected from the group consisting of alkali metal chlorides and alkaline earth metal chlorides is added to the clustered water for dissolution. At this time, the amount of the at least one compound selected from the group consisting of alkali metal chlorides and alkaline earth metal chlorides is effective to use the amount of 1 to 60% by weight based on the weight of the clustered water, alkali metal chloride and alkaline earth metal When at least one or more compounds selected from the group consisting of chlorides are used in less than 1% by weight, there is a disadvantage in that the binding strength with mineral components derived from the mineral powder is lowered. Weak

In a solution in which at least one or more compounds selected from the group consisting of alkali metals and alkaline earth metal chlorides are dissolved in clustered water, water containing a rare earth element with respect to the weight of the entire clustered water and a pH adjusting agent are mixed. Prepare a liquid binder.

Rare earth elements include lanthanum, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, turlium, yttbium, ruthenium, scandium, yttrium, etc. Also available. Water containing a small amount of rare earth elements functions as an adjuvant of at least one or more compounds selected from the group consisting of alkali metals and alkaline earth metal chlorides, and at the same time facilitates the combination of minerals and colloidal solutions by sterilization and bacteriostatic action. Function. The content of the rare earth element is effective to use less than 1% by weight based on the total weight of the clustered water, and even in the water containing the rare earth element, water is used as the clustered water.

On the other hand, by using a pH adjuster in the liquid binder to be prepared to make the pH of the product produced is slightly alkaline, the amount of the pH adjuster can be appropriately adjusted according to the required pH.

The liquid binder and the mineral powder prepared as described above are mixed in amounts of 10 to 90% by weight, respectively, to prepare a binder. If the liquid binder is less than 10% by weight or the mineral powder is more than 90% by weight, there is a disadvantage that the curing time is long, and if the liquid binder is more than 90% by weight or the mineral powder is less than 10% by weight of building materials There is a problem that the molding of the furnace is not easy.

When the liquid binder and the mineral powder are mixed, the condensation and hardening occur rapidly, so it is preferable to mix immediately before use.

The manufacturing method of the construction material according to the present invention is composed of 60 to 95% by weight of sludge such as purified sludge, sewage sludge, wastewater sludge, sediment sludge and 5 to 40% by weight of the binder, but the binder is C 5 ~ 71.7%, O 20 ~ 86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2-68.7%, Ti 0.1-66.8%, Mn 0.05-66.75% At least one compound selected from the group consisting of 10 to 90% by weight of mineral powder having an elemental composition ratio of 0.05 to 66.75% of Fe and 0.1 to 66.8% of Fe, and alkali metal chlorides and alkaline earth metal chlorides in clustered water To a solution eluting at least one or more alkali metals and alkaline earth metals selected from the group consisting of alkali metals and alkaline earth metals, wherein water containing less than 1% by weight of the rare earth element relative to the weight of the total clustered water is mixed with the pH adjusting agent. Liquid binder Preparing a binder consisting of 10 to 90% by weight; Mixing 60 to 95% by weight of the sludge and 5 to 40% by weight of the binder; Injecting a mixture of the sludge and the binder into a mold; Applying vibration to the mold, and then press molding the mixture of sludge and binder; After demolding, it is a step of natural curing and solidifying.

In the dry material manufacturing method of the present invention, the mixture of the sludge and the binder can be blended according to the above-described composition ratio dry, semi-dry, and wet, and the composition ratio can be adjusted according to the water content of the sludge.

Injecting a mixture of the sludge and the binder into a mold; After the vibration is applied to the mold, the second step of adding a mixture of the sludge and the binder and then press molding is not particularly limited as long as it is a method capable of uniformly forming the building material, it is usually in the technical field to which the present invention belongs The method used can be selected and applied.

When molding to a building material is completed, it demolds and performs natural curing. Preferably curing at a temperature of 25 to 80 ℃, but curing at room temperature, the curing period can be adjusted according to the temperature.

Although the mechanism of action for molding as a building material according to the present invention is not clear, the inorganic material of the sludge and the inorganic material of the mineral powder are strongly bound together with the clustered water to show a high strength, and also known binders used in the manufacture of building materials. It is possible to manufacture building materials using only minerals without using.

In other words, strong binding force is exerted by the reaction of dissolving → aquasol formation → condensation → gel formation → crystallization of mineral and sludge It is possible to obtain the strength more than the strength required in the building materials, solve the problems caused by the use of organic binders and synthetic resin materials, and by using a binder made only of inorganic materials, there is no discharge of pollutants, causing natural pollution, The sludge can be manufactured not only economically but also by a simple method.

In particular, environmental contaminants such as heavy metals contained in the sludge are strongly bound to the binder, and do not dissolve in water, so there is no discharge of contaminants from the sludge.

1 is a schematic diagram illustrating a molding mechanism of a building material according to the present invention.

Claims (3)

At least one sludge selected from the group consisting of purified sludge, sewage sludge, wastewater sludge and sediment sludge is composed of 60 to 95% by weight and 5 to 40% by weight of the binder, and the binder is C 5 to 71.7%, O 20 to 86.7 %, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2-68.7%, Ti 0.1-66.8%, Mn 0.05-66.75%, 10 to 90% by weight of the mineral powder having an elemental composition ratio of 0.05 to 66.75% of Fe and 0.1 to 66.8% of Fe and at least one compound selected from the group consisting of alkali metal chlorides and alkaline earth metal chlorides was added to the clustered water. Liquid containing a mixture of water and pH adjuster containing less than 1% by weight of rare earth elements relative to the weight of the total clustered water in a solution eluting at least one alkali metal and alkaline earth metal selected from the group consisting of alkali metals and alkaline earth metals Combination of The building material using sludge which consists of 10th-90weight%. C 5-71.7%, O 20-86.7%, Mg 1-67.7%, Al 1-67.7%, Si 3-69.7%, S 0.5-67.2%, Cl 0.5-67.2%, Ca 2 68.7%, Ti 0.1 At least one selected from the group consisting of 10 to 90% by weight of mineral powder having an elemental composition ratio of 6 to 66.8%, Mn 0.05 to 66.75%, Fe 0.05 to 66.75%, and In 0.1 to 66.8%, and alkali metal chlorides and alkaline earth metal chlorides The rare compound is less than 1% by weight of the total clustered water in a solution in which the above compound is added to clustered water and eluted at least one or more alkali and alkaline earth metals selected from the group consisting of alkali metals and alkaline earth metals. Preparing a binder consisting of 10 to 90% by weight of a liquid binder containing water and a pH adjusting agent; Mixing 60 to 95% by weight of the sludge and 5 to 40% by weight of the binder; Injecting a mixture of the sludge and the binder into a mold; Applying vibration to the mold, and then press molding the mixture of sludge and binder; Method for producing a building material using sludge, characterized in that consisting of the step of curing and solidifying after demolding. The method for producing a building material using sludge according to claim 2, wherein the curing is performed at room temperature.

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