KR20060016431A - Manufacture methods and system of solidification manufactured goods with solid waste - Google Patents

Abstract

The present invention is a technology for recycling waste into civil engineering and construction materials, mixing organic and inorganic sludge, coal ash, waste gypsum and the like, adding cement, and mixing and stirring additives, such as solid ash, and compacting or extruding civil engineering. · It is about recycling to construction materials. The sludge is dried and decomposed to a moisture content of about 20% or less and a ash content of about 90% or more, and then transferred to a pulverizer for pulverization. The pulverized sludge and coal ash and waste gypsum transferred according to the mixing ratio are first mixed in the mixer, and then mixed with the next cement to be uniformly mixed, and then mixed with the additives such as water and solidified materials. Product solids are produced. At this time, the mixing ratio of the sludge, coal ash, waste gypsum, etc. and the manufacturing conditions of the molding method are different depending on the application of the solid. The material of the product is general waste, and since the cement and solidifying agent are used in the manufacturing process, a solid product is produced without the elution of harmful substances. The use of solidified materials is based on the compressive strength of solidified materials. Various civil engineering and construction materials, such as artificial aggregates, blocks, interlocking blocks, bricks, artificial reefs, and strata materials, are based on KS F 4004 cement brick and KS L 5201 ordinary cement. Is utilized. Therefore, the development of waste solidification technology, which has very good characteristics in terms of compressive strength and dissolution of harmful substances, reduces the burden of increasing the waste disposal cost of the industry, and the problem of destroying the natural environment by discharging secondary environmental pollutants and collecting natural aggregates from waste disposal. Very useful for improving

Development of organic and inorganic sludge, solidification technology, civil and construction materials, coal ash, waste gypsum, cement, additives

Description

MANUFACTURE METHODS AND SYSTEM OF SOLIDIFICATION MANUFACTURED GOODS WITH SOLID WASTE}

1 is dried and decomposed organic and inorganic sludge according to the present invention, mixed with coal ash, waste gypsum, and the like, and then mixed with cement, and then mixed with additives such as solidified materials, followed by mixing and stirring, molding compression or extrusion, and curing. Schematic diagram of a solidified product manufacturing system that is recycled as civil engineering and construction materials. 2 to 6 is a graph showing the compressive strength according to the change in the mixing ratio of waste and cement.

2 is the compressive strength according to the cement weight ratio of 10% and the waste gypsum / sludge mixture ratio, Figure 3 is the compressive strength according to the cement weight ratio of 15% and waste gypsum / sludge mixture ratio, Figure 4 is a change in 20% cement weight ratio and waste gypsum / sludge mixture ratio Compressive strength according to Figure 5, the compressive strength according to the 25% cement weight ratio and the change of waste gypsum / sludge mixture, Figure 6 is a compressive strength according to the change of 25% cement weight ratio and coal / sludge mixture ratio and the mixing ratio and cement weight ratio of waste ash and coal ash and sludge According to the change, the compressive strength of the produced solids is different.

The present invention is a sludge drying and decomposition system for reducing organic sludge by drying and decomposing by using waste heat of incinerator, and solidifying product manufacturing method and resource utilization of solidified products by solidifying products solidified by mixing various general wastes. It relates to manufacturing conditions for each use. Most of the organic and inorganic sludges discharged from industrial and sewage treatment plants are landfilled, dumped, and incinerated, increasing environmental pollution in the surrounding area, and only a few of them are composted, methane fermented, earthworm-raised, building materials. Because it is recycled to the back, the recycling effect is very low.

In general, wastewater sludge, waste gypsum, and coal ash are mainly composed of landfill, incineration, and seawater discharge.In order to improve the problems caused by the recycling of most organic sludge, which is reclaimed or incinerated, Article 6 of the Enforcement Rule of the Waste Management Act Paragraph 1 Annex 4, “Standards and Methods of Business Waste from Designated Waste,” prohibits the direct reclamation of organic sludge from waste water treatment facilities since July 2003. Only the residues are required to be reclaimed after treatment by such methods. However, there is a problem of causing international disputes due to the fact that businesses do not prepare appropriate treatment measures for organic sludge and dump them at sea waste discharge companies with relatively low disposal costs.

Conventional technologies in the field of waste solidification are mostly for the purpose of simple reclamation, solidifying the hazardous substances such as incinerators or heavy metals contained in hazardous wastes by cement solidification to suppress the leaching of harmful substances, and in some workplaces, only inorganic wastes are selected and selected. In order to recycle the building materials, natural aggregate is added separately after drying, crushing, screening, and mixing, and the mixed materials are molded and cured and recycled on a limited basis such as bricks and sidewalk blocks.

The inventors of the present invention provide a high-intensity solidified product prepared by mixing cement and additives with wastes such as organic / inorganic sludge, waste gypsum, and coal ash, and artificial aggregate, block, interlocking block, brick, artificial reef, It has been found that the compressive strength and hazard test satisfy the quality standards in the civil and construction materials such as strata. In addition, the present inventors have succeeded in developing a solidification technology for economically manufacturing solidified bodies having different applications depending on the mixing ratio and the amount of cement for each waste when producing a solidified product.

The present invention for solving the above problems is to reduce the burden of waste disposal cost increase due to the prohibition of direct landfilling of sludge discharged in the petrochemical plant wastewater treatment process, and to develop the technology to resource the sludge depending on landfill or ocean dumping As the necessity increases, we have overcome the simple solidification technology that has been used mainly for solidifying hazardous waste to landfill, and secured a high-strength solidification technology that utilizes waste as civil engineering and construction materials. In other words, in order to utilize general wastes as high-strength civil and construction materials, it satisfies the compressive strength and hazardous quality standards of solidified products according to the types of wastes, mix ratios by waste, and the amount of solidifying agent and cement. It is characterized by economical and easy manufacturing of solidified products suitable for demand and utilization. Therefore, the demand for solidified products and the wider use of products are maximized to maximize the amount of waste recycled, thereby preventing environmental pollution due to waste disposal, and improving qualitative problems such as natural damage by developing quarries due to lack of civil engineering and construction materials such as gravel. It is an environmentally friendly technology that prevents the secondary environmental pollution problem caused by the effects and the increase of waste disposal cost at the workplace and sludge treatment. Therefore, the present invention secures a quality standard as a cement brick or a cement, and the waste is very useful by applying the waste to various civil and construction materials.

The present invention is a solidification technology for utilizing waste as civil engineering and construction materials, the combination of sludge, waste gypsum and coal ash, while the cement content is changed from 10 to 25% by weight of the total waste, the mixing ratio of waste gypsum and sludge 0.07 to 0.50, coal ash and sludge mixing ratio 0.14 The experiment was adjusted to ˜0.33. The amount of hardener used in the experiment was diluted 400 times with 100 ml of concentrated liquid, and when the coal ash and sludge mixture ratio was 0.45-0.60, the concentrated liquid was diluted 600 times with 150 ml. The molding pressures of the mixture were 30 kgf / cm 2 and 60 kgf / cm 2. Physical properties of the wastewater sludge, waste gypsum, coal ash, and cement which are the solidification materials are shown in Table 1 below.

Table 1. Physical Properties of Wastewater Sludge

division Water content (%) Dry weight standard (%) Humidity standard (%) Ash content Ignition loss Ash content Combustible content Wastewater Sludge (H Company) 39 81 19 49.41 11.59 Waste Gypsum (N Company) 12 89 11 78.32 9.67 Coal ash (H company) 0.3 99.6 0.4 99.30 0.40 cement One 98 2 97.02 1.98

Hereinafter, the present invention will be described in detail with reference to the drawings. 1 is a schematic diagram of a solidified product manufacturing process of waste. In the method of recycling waste such as sludge, waste gypsum and coal ash to materials of civil engineering and construction materials such as artificial light aggregate, block, interlocking block, brick, artificial reef and strata, the sludge Conveyor or transfer screw is transferred to the drying device to dry it to about 20% water content, and this dry sludge is transferred to the grinding device to be pulverized into small particles of a certain size. Is added at a fixed ratio, mixed with a blender, water and solidified materials are added to the mixture, mixed uniformly, transferred to a compression molding machine or an extruder, molded into a predetermined shape, and finally cured in a curing room. The product is complete.

In order to solidify the waste and turn it into a civil engineering and building material, the compressive strength of the sludge, waste gypsum and the mixture of sludge and coal ash was measured. As a result of the study, the following conditions are used to apply the waste based on the cement brick and ordinary cement based on the compressive strength of the solidified material which is changed according to the mixing conditions.

Compressive strength according to the amount of cement and waste gypsum / sludge mixture ratio of the present invention

In order to measure the compressive strength according to the blending ratio of the sludge and the waste-rock solids in the physical property test of the solidification conditions of the present invention was tested while changing the amount of cement to 0.6kg, 20% 1.2kg, 25% 1.5kg. The solidifying agent was diluted 400-fold dilutions of the stock solution and injected into 50 ml, and the solidified body forming pressure was formed at 30 and 60 kg / cm 2. At this time, the compressive strength under each condition was investigated while changing the mixing ratio of waste gypsum / sludge from 0.07 to 0.45. The curing period was set to 7 days, 14 days and 28 days.

Cement brick manufacturing condition (when the cement amount is 20w%)

2 and 3 shows the compression strength under each condition while maintaining the cement content of 1.2 kg with a weight ratio of 20% and changing the mixing ratio of waste gypsum / sludge to 0.07, 0.14, 0.23, 0.33, 0.45. In the case of / cm2, the waste gypsum / sludge ratios exceeded the 7-day compressive strength of 80 kgf / cm2 and the 28-day compressive strength of 110 kgf / cm2 for the KS F 4004 cement bricks at 0.07, 0.33 and 0.45. In addition, the molding pressure of 60 kgf / ㎠ exceeded the compressive strength criterion of KS F 4004 cement brick at the mixing ratio of all conditions. Therefore, the solidified body formed under the above conditions can be utilized as a civil engineering and building material based on cement bricks.

Cement brick manufacturing conditions (when the cement amount is used 25w%)

4 and 5 fixed the cement amount to 1.5kg, which is 25% of the total weight ratio, and determined the compressive strength under each condition while changing the mixing ratio of waste gypsum / sludge to 0.07, 0.15, 0.25, 0.36 and 0.50. At pressures of 30 kgf / cm 2, the waste gypsum / sludge ratios exceeded the compressive strength criteria of KS F 4004 cement bricks at 0.15, 0.25, 0.36 and 0.50. In addition, the molding pressure of 60 kgf / ㎠ exceeded the compressive strength criterion of KS F 4004 cement brick at the mixing ratio of all conditions. Therefore, the solidified body formed under the above conditions can be utilized as a civil engineering and building material based on cement bricks.

Compressive strength according to the amount of cement and coal / sludge mixture

The compressive strength of the coal ash / sludge mixture ratio was measured while the cement content was fixed at 1.2 kg, which is 20% of the total weight ratio. The amount of solidified agent was injected 100ml by diluting 400 times in case of coal ash / sludge mixture ratio 0.14, 0.23 and 0.33 according to the water content of mixed sludge, and injecting 150ml by diluting 600 times in case of 0.45 and 0.60 mixture ratio. The molding pressure of the blend was 60 kg / cm 2. The compressive strength of the coal ash / sludge was varied to 0.14, 0.23, 0.33, 0.45, and 0.60 while the curing period was changed to 7 days, 14 days and 28 days.

Cement brick and normal cement manufacturing conditions

6 shows that the compressive strength test results according to the change of coal ash / sludge ratio were higher than the compressive strength of KS F 4004 cement brick when the coal ash / sludge blend ratio was 0.14, 0.23, 0.33, 0.45 and 0.60. Therefore, the solidified body formed under the condition of coal ash / sludge ratio of 0.14 ~ 0.60 can be used as civil engineering and building material based on cement brick. In addition, when the blending ratio of coal ash / sludge was 0.45 and 0.6, the compressive strength of KS L 5201 ordinary cement was higher than the standard value. Therefore, the solidified body formed under the coal ash / sludge ratio of 0.45 and 0.60 can be used not only for cement brick but also for civil and construction materials based on ordinary cement.

Dissolution Characteristics of Solidified Products

In the process of producing solidified products by combining waste gypsum / sludge and coal ash / sludge, the hazard evaluation of the solidified product prepared when the solidifying agent was not used and when the solidifying agent used the A and B agents were carried out. The hazard assessment items of the product were Cr ^{+ 6} , Cu, Zn, Cd, and Pb. The results showed that the heavy metal elution concentrations of all the samples remained within the emission allowance standard suggested by the Waste Management Act, so that no hazardous substance elution of solidified products. The elution characteristics of hazardous substances of solidified products by type of solidifying agent are shown in Table 2 below.

Table 2. Elution Characteristics of Hazardous Substances in Solidified Products by Type of Solidifying Agent

division Cu + 6 Cu Zn CD Pb Emission allowance standard (mg / l) 1.5 or more More than 3 - 0.3 or more More than 3 Not input 0.258 0.822 0.315 0.285 0.314 A made 0.183 1.071 0.432 0.216 0.510 B agent 0.779 0.342 0.297 0.281 0.500

Economic Evaluation of Solidified Products (Cement Brick and Normal Cement Manufacturing Cost)

The manufacturing cost of the solids as cement brick was investigated. The experimental results of solidified material exceeding the compressive strength of KS F 4004 cement brick showed that the waste gypsum / sludge mix ratio was 0.07, 0.33 and 0.45 when the weight ratio of cement was 20% (1.2㎏) of the total waste and the molding pressure was 30㎏ / ㎠. In the case where the molding pressure was 60 kg / cm 2, the waste gypsum / sludge mixture ratio was 0.07 to 0.45. In the case of the installation of recycling facilities, the production capacity of solidified materials based on cement bricks was reviewed based on about 18,000 tons per year. The total production cost of cement bricks is 735,635 thousand including material costs, labor costs, expenses, general management costs and profits. The survey was conducted at 40,868 won. The manufacturing cost of using solids as ordinary cement was investigated. As a result of the experiment, the solidified product condition exceeding the KS L 5201 ordinary cement compressive strength standard was 150ml by diluting the cement weight ratio by 20% (1.2㎏) of the total waste, the forming pressure of 60㎏ / ㎠ and the solidifying solution 600 times. The coal ash / sludge mixture ratio was 0.45 and 0.60 in the state of injection. In the case of the installation of recycling facilities, the cost of producing solidified materials in accordance with ordinary cement is not included in the cost of materials such as sludge and coal ash, so the conditions of cement, hardener and additives included in the material cost are the same as those of KS F 4004 cement brick manufacturing conditions. .

As described above, in order to solidify the mixture of organic and inorganic wastewater sludge, waste gypsum and coal ash, the solidified material formed by using the waste was measured as a result of measuring the compressive strength according to the mixing ratio of the sludge, waste gypsum, sludge and coal ash. The mixing conditions for brick and ordinary cement are suggested. Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the claims below. It will be appreciated.

Claims (3)

In the use of waste as civil engineering and construction materials, high-intensity solids manufactured by mixing and stirring organic / inorganic sludge, coal ash, and waste gypsum and cement with additives, followed by mixing, stirring or molding, Method of manufacturing solidified products using waste, characterized in that it is utilized as artificial aggregates, blocks, interlocking blocks, bricks, artificial reefs, and strata materials based on cement In the case of organic sludge, the water content is about 20% or less, the ash content is about 90% or more, and then dried and decomposed and then transferred to the pulverizing apparatus 5 for pulverization. , Waste gypsum, waste sand, etc. are mixed in the mixer (8), the cement is mixed evenly and then mixed with water and additives such as solidified materials, mixed and stirred by molding or compression in the compressor or extruder (9) to produce a solid ; In case of inorganic sludge, coal sludge, waste gypsum, waste sand, etc., which have been transferred according to the mixing ratio, are mixed in a mixer, and mixed uniformly by adding cement, and then mixed with water and solidified additives. Forming compaction or extruding in a compressor or extruder (9) to produce solids; Manufacturing conditions of solidified products for use as civil engineering and construction materials such as blocks, interlocking blocks, bricks, and strata materials in accordance with KS F 4004; Maintaining the amount of cement in an amount of 10 to 30% by weight, compressing (9) the molding pressure from 20 kgf / cm 2 to 60 kgf / cm 2 and producing a solidified product with a waste gypsum / sludge ratio of 0.07 to 0.60; Maintaining the amount of cement in an amount of 10 to 30% by weight, compressing the molding pressure from 20 kgf / cm 2 to 60 kgf / cm 2 (9), and producing a solidified product at a coal ash / sludge ratio of 0.10 to 0.70; Maintaining the amount of cement from 10% to 30% by weight, mixing the coal ash / sludge ratio from 0.10 to 0.70 and then manufacturing the solidified product by extrusion in the extruder 9; Injecting additives under the above conditions, there is no harmful substance elution, and in order to maintain a high strength, the solidified product is prepared by diluting the extractorong concentrate 400-600 times. Manufacturing conditions of solidified products for use as civil and construction materials such as lightweight aggregates, blocks, interlocking blocks, bricks, artificial reefs, and strata according to KS L 5201 ordinary cement; Maintaining the amount of cement in an amount of 15% to 30% by weight, compressing the molding pressure from 30 kgf / cm 2 to 60 kgf / cm 2 and producing a solidified product with a coal ash / sludge ratio of 0.30 to 0.70; Maintaining the amount of cement in an amount of 15% to 30% by weight, mixing the coal ash / sludge ratio from 0.30 to 0.70, and then manufacturing the solidified product by extrusion in the extruder 9; Injecting additives under the above conditions, there is no harmful substance elution, and in order to maintain a high strength, the solidified product is prepared by diluting the extractorong concentrate 400-600 times.

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