JP2001300589A - Treating method of sludge into useful material and equipment therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treating method of sludge into useful material and equipment therefor which enables treating various sludge liquid, producing improved material having excellent compression strength at a low cost, utilizing and recycling the improved material as substitutes of crushed stone and sand for material of construction and corresponding to the exhaustion of reclamation land. SOLUTION: This treating method of sludge into useful material consists of the first process which allows sludge to be subjected to solid-liquid separation at dehydration pressure of 1.5-4.0 MPa and forms dehydrated cake, the second process which crushes the generated dehydrated cake, thereafter, adds reforming material composed of cement and/or lime to the mass of solid content of the dehydrated cake in the range of weight ratio and stirs and mixes the mixture, the third process which performs press molding by applying a linear load of molding 10-100 KN/cm to the mixture formed in the second process, and the forth process which ages the press moldings formed in the third process or crushes the same after aging. The equipment for attaining the method is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to, for example, washing wastewater in quarries and mines, and bottom sediment recovered in bottom mud dredging work.
The present invention relates to a sludge material conversion method and an equipment for effectively utilizing sludge liquid such as waste mud water in shield construction to general civil engineering materials such as crushed stone and sand.

[0002]

2. Description of the Related Art Conventionally, such waste mud such as washing waste liquid in a wet quarry or a mine for washing raw ore, collected bottom mud in bottom mud dredging work, waste mud in shield work, etc. Contains a large amount of solids, and needs to be treated. As this treatment technique, it has been widely used in the past that, after dehydration with a filter press having a low pressurizing pressure, treatment is generally performed by landfilling within the self, or by requesting disposal by a specialized contractor. Met. However, this method has recently depleted landfills,
The situation has become extremely severe due to rising disposal costs. In other fields, recycling of solid powder,
Effective utilization is highly expected in terms of effective utilization of resources.

[0003] Such a technique intended for recycling is disclosed in, for example, JP-A-8-11111. This method is a method of mixing a dewatered cake obtained by dewatering the object to be treated with a dehydrator with an improving material such as a cement solidifying material, and then obtaining a granular improved product by a kneader or the like. As described in FIG. 12, the dehydrated cake is granulated to 2.5 to 13 mm in the same manner as described above,
There has been proposed a method of producing a kind of pottery by firing at a high temperature of about 0 ° C.

[0004]

However, in the method disclosed in Japanese Patent Application Laid-Open No. H08-11111, it is possible to produce a granular improved product using cement solidification as a binder, Since there is no pressure step, the product is a porous product having extremely large voids and cannot be expected in terms of strength. In other words, there is a problem that the product is not dense and the granular improved product is finely divided by an external force if the strength is expected. Therefore, it is insufficient in strength to be used as a substitute for crushed stone and sand, which are like civil engineering materials.
There is a limit to the application.

[0005] In the latter method, solid particles of raw mud are calcined with cement as a binder, which is a so-called calcined product having excellent strength characteristics and stability. There is a problem that it requires a large amount of energy cost and is difficult to be applied as a practical application technology in terms of total economy. The present invention solves the above-mentioned problems, and as a practical recycling technique from various sludge solutions, civil engineering materials such as crushed stone,
The purpose of this invention is to provide a method for converting sand into sand using a relatively simple method and equipment, and to solve the above-mentioned conventional excessively unstable quality (insufficient strength), an increase in energy costs and an increase in equipment costs, and It is an object of the present invention to provide a method for converting sludge into a material and a facility therefor as a simple recycling technique.

[0006]

SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems. The gist of the invention is as follows. (1) Sludge is solid-liquid at a dewatering pressure of 1.5 to 4.0 MPa. The first step of separating and producing a dewatered cake, after crushing the generated dehydrated cake, based on the solid content mass of the dehydrated cake,
5 to 3 of cement and / or lime improving material
A second step of adding the mixture in a mass ratio of 0%, stirring and mixing, and adding 10 to 100 KN to the mixture produced in the second step.
A process comprising a third step of applying pressure by applying a molding linear pressure of / cm, and a fourth step of curing or crushing the cured product produced in the third step after curing. A method for converting sludge into a material, wherein the material produced by the method has a uniaxial compressive strength of 1.0 KN / cm ² or more and has a lump or sand shape. (2) The sludge in the first step is used as the shield construction sludge or the collected bottom mud in the dredging work, and the amount of the improving material added in the second step is 1 to the solid content mass of the dewatered cake.
The method for converting sludge into material according to the above (1), wherein the mass ratio is in the range of 0 to 30% and the molding linear pressure in the third step is 20 to 100 KN / cm.

(3) Dewatering means for forming a dewatered cake by solid-liquid separation of sludge by a filter press, crushing means for crushing the dewatered cake, and cement and / or It has an adding / stirring / mixing means for stirring / mixing after adding the improving material composed of lime, and a pair of rolls, and a plurality of concave hole shapes are formed on the surface of the rolls facing each other. In the hole of the forming roll, the mixture is compressed, and a pressure molding means for compressing and molding, and a curing / crushing means for curing or crushing the pressure molded article after curing. Is a sludge material conversion facility.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is a diagram showing a processing method and a flow of the equipment when the method and equipment of the present invention are applied to an actual water-washing type quarry factory. As shown in this figure,
As the dehydrating means in the first step, a filter press, which is a conventionally known dehydrator 1 for separating a dewatered liquid into a solid and a liquid by separating a dewatered liquid from a washing waste liquid generated from a water-washing crushed stone mill, is used. Dehydrate. In this case, in the present invention, after the dehydration is performed by a dehydration pressure of 1.5 to 4.0 MPa, which is a very high pressure compared to the conventional method, the conveyor 2
To the second step.

In the second step, as a crushing means 4 for crushing the dewatered cake 3, a rotating rotor having blades, a screw-type paddle mixer, or the like is used. The crushed coarse crushed powder 5 is added to a kneader 6 with an improving material 7 and, if necessary, a small-diameter crushed stone 8 and stirred.
Mix. Next, pressure molding is performed using a pressure molding machine 9 constituting a main part of the pressure molding means in the third step. As shown in the detailed view of FIG. 2, the press forming machine 9 includes a pair of forming rolls 10 and a bearing 11, a pressing unit 12 for the forming rolls 10, a hopper 13, a screw 14, and a casing 15. . The forming roll 10 is supported by bearings 11 provided on a casing 15, respectively.
A pressing means 12 for a forming roll is provided. In addition,
Reference numeral 16 denotes a hole type (recess).

Although the pressing means 12 is not shown, a mechanism such as a horizontal slide structure of the molding roll 10 is provided by, for example, a hydraulic cylinder, thereby moving the molding roll 10 on the right side in the figure to the left and right in the figure. The distance between the molding rolls 10 is adjusted by the movement, so that the molding linear pressure of the processed material to be subjected to compression / pressure molding by the hole die 16 formed in the molding roll 10 can be easily adjusted. Make up. A plurality of concave hole dies 16 are formed on the surface of the molding roll 10 so as to face each other, and the roll is rotationally driven by driving means (not shown).
In the fourth step, the briquettes (bean charcoal shape) 17 produced in the third step are cured to obtain improved briquettes, or after curing, crushed to obtain improved sand.

The operation of the pressure molding machine 10 having the above configuration will be described in accordance with the following procedures. The required pressurizing linear pressure is preset according to the type of sludge to be treated, the water content, and the like, and the pressing rolls 12 of the forming rolls are used to reduce the distance between the forming rolls 10 according to the pressurizing linear pressure. adjust. From the upper part of the hopper 13, the mixture after the second step is introduced. (If necessary, the water content of the mixture is adjusted by a heater not shown). The recessed die 16 formed on the surface of the molding roll 10
The mixture from the hopper 13 is drawn in with the rotation of the roll (FIG. 2A-A '), and the mixture passes through the center line of both rolls where the two-hole type is closest (FIG. 2B). In -B '), a maximum pressing linear pressure is applied, and the molding is performed tightly. Thereafter, the two molds are separated, and the molded product is dissociated from the mold 16 and discharged from below as a product.

In the above procedure, when the mixture is not well drawn into the mold, the rotation can be improved by rotating the screw 14 shown in FIG. On the other hand, regarding the setting of the appropriate shape of the concave die 16 to be opened in the molding roll 10, for example, an oval shape as shown in FIG.
It is advisable to appropriately select the shape of the charcoal as shown in FIG. FIG. 4 shows that the material after pressure molding and curing was crushed and the grain shape was reduced to 0.1.
５5.0 mm, which can be used as a substitute for sand widely used in the construction and civil engineering fields at present.

Next, a method of setting an appropriate dewatering pressure in the case where dewatered cake is produced from various kinds of sludge in the first step will be described with reference to FIGS. Fig. 5 shows various types of sludge, such as washing waste liquid A in a quarry, shielding sludge B in a quarry, and collected bottom sludge C in a dredging work, and various dehydration pressures changed by a filter press. The results of various measurements of the water content of the dewatered cake after this are shown. From this FIG. 5, it became clear that the water content of the dewatered cake decreased with increasing dewatering pressure in all sludges. In particular, it can be seen that even at a high dehydration pressure of 3 to 5 MPa, which has not been practiced with a conventional filter press, the water content of the dewatered cake decreases with an increase in this pressure.

FIG. 6 is a graph showing the results of various measurements of the wet density of the dewatered cake after dehydration at various dehydration pressures with a sludge and a filter press. From FIG. 6, it was clarified that the wet density of the dewatered cake increased as the dehydration pressure increased. In particular, it has been clarified that the wet density of the dewatered cake increases with an increase in the pressure even at a high dehydration pressure of 3 to 5 MPa, which is not practiced with a conventional filter press. That is, it was found that a dense dewatered cake can be generated by applying a high dewatering pressure to the sludge.

FIG. 7 shows the results of various measurements of the cone index value when the dewatered cake after dewatering was changed into soil by changing the dewatering pressure using a sludge and a filter press in the same manner as described above. is there. The cone index value in this case is an index value of the strength of the compacted soil, and the higher this value is, the higher the strength of the cake is. It is a field that has many fields. From FIG. 7, it is clear that the cone index value of the dewatered cake increases with an increase in the dewatering pressure.
In particular, it was found that the cone index value of the dewatered cake increased with the increase of the pressure even at a high dehydration pressure of 3 to 5 MPa, which was not practiced with a conventional filter press. In other words, it was found that by applying a high dewatering pressure to the sludge, a dewatered cake having a high compaction strength can be generated.

Based on the above results, an appropriate dehydration pressure in the first step of the present invention was set as follows. That is, the dehydration pressure in the first step is important because it greatly affects the action in each of the subsequent steps. Among them, in the pressure molding step, which is the third step of the present invention, the dehydration pressure of the mixture If the water content of the dewatered cake that makes up the majority of the composition is too high, although an improving agent such as cement lime is added in the second step, which is the previous step, the water content of this mixture is still high, and the third step In the pressure molding, it is difficult to apply a required molding linear pressure to the mixture. Therefore, the lower limit of the dehydration pressure was set to 1.5 MPa in consideration of these factors.

On the other hand, although the higher the upper limit is, the better, the filter press equipment used in the first step tends to increase in size according to the square ratio of the dewatering pressure. 4 upper limit in consideration of increase
MPa. The type of sludge to be treated is
In the case of the above-mentioned muddy solution B for shield work, the bottom sediment C collected in dredging work, and the like, the water content after dewatering is particularly high as shown in the test result of the water content of the dewatered cake. Therefore, in this case, after dehydration as the first step, in the next second step, an improving material consisting of cement and lime is added,
In the case of stirring / mixing, the stirring / mixing time is increased, and the water content is adjusted by increasing the heat generated by the reaction or by providing heating means in the stirring / mixing means.

In the third step of the present invention, the compression / pressing effect which is important in the press molding is greatly influenced by the water content of the mixture immediately before being put into the press. Therefore, the following preliminary test confirmed the effect. FIG. 8 shows load currents in an actual press molding machine when washing waste liquid in a quarry is used and the water content is variously changed from the above three representative sludges to which the present invention is applied. Is measured. As a result, it was found that the load current was proportional to the molding linear pressure, and that the load current increased as the moisture content of the mixture immediately before being injected into the pressure molding machine increased, and a higher molding linear pressure was applied. It has been found.

When the amount of water is high, the viscosity of the mixture is high, so that the fluidity is poor. As a result, the draw-in of the mixture into the mold of the molding roll becomes worse, and as a result, the mixture is insufficiently filled into the mold and the required molding linear pressure cannot be obtained. In addition, at the maximum pressing position of the molding roll, the moisture of the mixture escapes into the gap between the solid particles in the mixture, thereby reducing the expected pressurizing action between the particles by half. Moreover, since the molding roll is rotating,
As a result, pressurization at the maximum pressurization position becomes an instantaneous pressurization action, and this phenomenon occurs frequently when there is a lot of moisture. As described above, it was found that when the mixture had a large amount of water, the required molding linear pressure could not be obtained, and as a result, insufficient compaction of the solid particles occurred in the hole mold, which tended to not result in a dense molded product. did.

Further, as another phenomenon, if the mixture contains a large amount of water, the processed product after pressure molding does not dissociate from the mold. In other words, the tackiness of the processed material increases, so that the material cannot be separated from the die and returns to the supply portion of the mixture with the rotation of the forming roll, so that the pressure forming ability is greatly reduced. As described above, when performing the pressure molding in the third step, the appropriate water content of the mixture was set to 12% or less. However, this value is specific to the constituent particles of the target sludge, and in an actual operation, it is necessary to set an appropriate water amount in advance for each sludge to be treated.

FIG. 9 shows a case where a washing waste liquid sludge water in a quarry is used as sludge and a filter press is used in the first step.
After dehydration at a dehydration pressure of 9 to 3.0 MPa, this dewatered cake was crushed to be used as a raw material for the test, and the amount of cement, lime, or a mixture of cement and lime added as an additive in the second step. In addition to the various steps, the third step, a pressure forming means, has a pair of rolls, and the surface of this roll is formed of a forming roll in which a plurality of concave molds are formed facing each other. Tests were performed using a pressure molding machine while changing the molding linear pressure in the molding machine in various ways, and the test results obtained by measuring the uniaxial compressive strength of the molded product obtained at that time are shown. In this test, the water content of the mixture charged into the pressure molding machine was 10 to 12% based on the results of the test.
Was used.

Next, the lower limit of the appropriate amount of the modifier to be added was 5% of the solid content of the dewatered cake. As is evident from the test results in FIG. 9, when the amount is 5% or more, the uniaxial compressive strength of the molded product is about 1.0 KN / cm ² even if the molding linear pressure is reduced as low as 10 KN / cm. Is a value which can be sufficiently diverted to a massive civil engineering material which does not require relatively high strength, whereby the lower limit of the amount of the additive added is 5% or more. On the other hand, if it exceeds 30%, even if the molding linear pressure is increased, the uniaxial compressive strength of the molded product is saturated, and there is no effect. This value was set as the upper limit from the viewpoint of cost reduction.

Further, the molding linear pressure is 10 to 100 KN / c.
The reason for setting m is that if it is lower than 10 KN / cm, as shown in FIG. 9, even if the addition amount of the improving material in the second step is increased to, for example, about 7%, the molded product becomes insufficiently compacted. Many of the porous materials have insufficient strength, and the uniaxial compressive strength is lower than about 1.0 KN / cm ^2, which limits the diverted destination. On the other hand, when the molding linear pressure reaches a high linear pressure value exceeding 100 KN / cm, it is already in a sufficiently compacted state in the molding die. This value is set as the upper limit because the running cost becomes higher and the running cost becomes higher.

FIG. 10 shows the wastewater from the shield work as sludge, and FIG. 11 shows the sediment recovered from the dredging work.
2.9-3.0MP with filter press in the first step
After dehydration at the dehydration pressure of a, the dewatered cake was crushed and used as a raw material for the test, and as an additive in the second step,
Cement, lime, or the amount of addition of a mixture of cement and lime is variously changed, and the pressure molding machine is used as the third step of the pressure molding means, and the molding linear pressure is varied by the molding machine. This is a test result obtained by performing a test and measuring a uniaxial compressive strength of a molded product obtained at that time.

In this test, the water content of the mixture charged into the pressure molding machine was determined based on the results of each test conducted in advance, and in the case of the muddy liquid for shield work, the water content was 20%.
~ 23%, in case of collected bottom mud from dredging work, water content ratio is 30
３５35% were used. From the results of this test, the type of the improving material, the proper addition amount of the improving material, and the proper molding with the pressure molding machine when the method of the present invention is performed using the muddy liquid for shield work and the collected bottom mud for dredging work The linear pressure was set.

As an appropriate addition amount of the modifier, its lower limit was set to 10% of the solid content of the dewatered cake. As is clear from the test results of FIGS. 10 and 11, when the amount is 10% or more, the uniaxial compressive strength of the molded product is about 1.0 KN / cm ² even if the molding linear pressure is reduced as low as 20 KN / cm. This strength is a value that can be sufficiently diverted to a massive civil engineering material that does not require relatively high strength, and the lower limit of the amount of the modifier added is set to 10% or more. On the other hand, when it exceeds 30%, even if the molding linear pressure is increased, the increase in the uniaxial compressive strength of the molded product reaches saturation, and there is no further effect. This value was set as the upper limit in view of extending the life of the molding machine and reducing the running cost.

Next, the lower limit of the molding linear pressure is set to 20 KN / cm.
The reason is that if it is lower than 20 KN / cm, FIG.
As shown in FIG. 1, even when the amount of the modifier added in the second step is increased to, for example, about 10%, the molded product becomes insufficient in consolidation, and the porous material is often insufficient in strength, resulting in insufficient uniaxial compressive strength. Is lower than about 1.0 KN / cm ² , and the diversion destination is limited. On the other hand, the molding linear pressure is 100K
When the linear pressure value exceeds N / cm, it is already in a sufficiently compacted state in the molding die, and applying a molding linear pressure higher than this becomes an excessive function in terms of equipment, becomes expensive, and runs. This value was set as the upper limit because the cost would increase.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a processing method and a flow of the equipment when the method and equipment of the present invention are applied to an actual water-washing type quarry factory. As shown in this figure, in a quarry, quarries are crushed, washed and classified to produce quarried products. On the other hand, the washing water contains solids and is concentrated and precipitated by the thickener 18 to become sludge water. Thereafter, the sludge water is withdrawn by a withdrawal pump 19 provided at the lower part of the thickener 18, and the driving pump 20
To the dehydrator 1. The input sludge is 3.
Solid-liquid separation is performed at a dehydration pressure of 1 MPa, and a dehydrated cake 3 is generated. (First step)

The dewatered cake 3 is crushed on a conveyor 2 by a crusher 4.
10 to 20 mm coarsely crushed powder 5
Becomes Thereafter, the coarsely crushed powder 5 is put into a kneader 6, to which cement as a modifier 7 is added at a mass ratio of 6% to the solid content of the coarsely crushed powder, and then the mixture is mixed with the kneader. 6 is stirred and mixed. (Second step) The mixture is then charged into a molding machine 9 and a molding roll 10
Thereby, a molding linear pressure of 12 to 13 KN / cm is applied to the mixture, and a briquette (bean charcoal shape) having a size of about 40 mm square is molded. (Third step)

Thereafter, the briquettes are cured outdoors for about 7 days, and the briquettes (bean charcoal shape) exhibit strength and become solidified products.
The solidified briquettes (bean charcoal shape) are directly used as improved briquettes (bean charcoal shape), for example, as substitutes for crushed stones for civil engineering materials, and those crushed and adjusted to a particle size of 0.1 to 5.0 mm, It is effectively used as improved sand and sand for civil engineering materials. (Fourth step). In this case, the uniaxial compression strength of the molded product is about 1.0 KN / cm ² , and this strength is a value that can be sufficiently diverted to a massive civil engineering material that does not require relatively high strength.

As described above, in the embodiments and examples of the present invention, there are three types of sludge to which the present invention is applied: a washing waste liquid A in a quarry factory, a shield work waste liquid B, and a collected bottom mud C in dredging work. However, the sludge to which the present invention is applied is not limited to this. For example, limestone, silica, and the like in mines such as limestone and silica stone in which the properties of sludge are similar to the washing waste liquid A in a quarry factory are described. Sludge consisting of waste liquid, similar to sludge liquid B for shield construction, sludge similar to sludge wall construction work, sludge for construction work such as cast-in-place piles, sludge from construction excavation, etc. It can be widely applied to sludge such as paper mill waste mud and food mill waste mud.

[0032]

As described above, the mixture obtained by adding the cement and / or lime improving material to the crushed dewatered cake according to the present invention has a viscosity of 10 to 100 KN / cm.
After applying the molding linear pressure and curing, the molded product has a high compressive strength by being crushed, and can be widely used and recycled as a substitute for crushed stone and sand for civil engineering materials, and can cope with depletion of landfills. In addition, it is possible to increase the compressive strength of the molded product without heating during production,
Energy costs and equipment are very compact, and extremely excellent effects are achieved.

[Brief description of the drawings]

FIG. 1 is a diagram showing a processing method and equipment flow when the method and equipment of the present invention are applied to an actual water-washing type quarry factory;

FIG. 2 is a detailed explanatory view showing the structure of a molding machine according to the present invention,

FIG. 3 is a view showing a shape of a material;

FIG. 4 is a view showing the shape of material sand;

FIG. 5 is a diagram showing the relationship between the dewatering pressure and the water content of the dewatered cake,

FIG. 6 is a diagram showing a relationship between dewatering pressure and wet density of a dewatered cake;

FIG. 7 is a diagram showing a relationship between dehydration pressure and cone index value of dehydrated cake,

FIG. 8 is a diagram showing a relationship between raw material moisture and molding machine load current;

FIG. 9 is a diagram showing the relationship between the addition rate of the improving material in the cleaning waste liquid of the quarry, the molding linear pressure, and the uniaxial compressive strength.

FIG. 10 is a diagram showing the relationship between the addition rate of an improving material in the muddy liquid for shielding work, the molding linear pressure, and the uniaxial compressive strength;

FIG. 11 is a diagram showing the relationship between the rate of addition of an improving material in the collected bottom mud in dredging work, the forming linear pressure, and the uniaxial compressive strength,

FIG. 12 is a diagram showing a process flow of the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dehydrator 2 Conveyor 3 Dehydration cake 4 Crusher 5 Coarse crushed powder 6 Kneader 7 Improvement material 8 Small diameter crushed stone 9 Pressure molding machine 10 Molding roll 11 Bearing 12 Molding roll pressing means 13 Hopper 14 Screw 15 Casing 16 Hole type (recess) 17 Briquette (bean charcoal shape) 18 Thickener 19 Extraction pump 20 Driving pump

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[Procedure amendment]

[Submission date] May 15, 2000 (2000.5.1)
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction contents]

[0004]

However, in the method disclosed in Japanese Patent Application Laid-Open No. H08-11111, it is possible to produce a granular improved product using cement solidification as a binder, Since there is no pressure step, the product is a porous product having extremely large voids and cannot be expected in terms of strength. In other words, there is a problem that the product is not dense and the granular improved product is finely divided by an external force if the strength is expected. Therefore, a civil engineering materials For example, crushed stone, to divert as an alternative to sand is insufficient strength,
There is a limit to the application.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction contents]

[0005] In the latter method, solid particles of raw mud are calcined with cement as a binder, which is a so-called calcined product having excellent strength characteristics and stability. There is a problem that it requires a large amount of energy cost and is difficult to be applied as a practical application technology in terms of total economy. The present invention solves the above-mentioned problems, and as a practical recycling technique from various sludge solutions, civil engineering materials such as crushed stone,
The purpose of the present invention is to provide a method for converting sand into sand using a relatively simple method and equipment, and to solve the problems of the conventional problems of unstable quality (insufficient strength), increased energy costs and increased equipment costs. It is an object of the present invention to provide a method for converting sludge into a material and a facility therefor as a simple recycling technique.

[Procedure amendment 3]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction contents]

Based on the above results, an appropriate dehydration pressure in the first step of the present invention was set as follows. That is, the dehydration pressure in the first step is important because it greatly affects the action in each of the subsequent steps. Among them, in the pressure molding step, which is the third step of the present invention, the dehydration pressure of the mixture If the moisture content of the dewatered cake that makes up the majority of the composition is too high, although the cement , lime and other modifiers are added in the second step, which is the previous step, the moisture content of this mixture is still high, and In the pressure molding, which is a process, it is difficult to apply a required molding linear pressure to this mixture. Therefore, the lower limit of the dehydration pressure was set to 1.5 MPa in consideration of these factors.

[Procedure amendment 4]

[Document name to be amended] Drawing

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

 ──────────────────────────────────────────────────続 き Continued on the front page (71) Applicant 000129862 Keihan Co., Ltd. (72) Inventor Shigeyuki Uchiyama 46-59 Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka New Nippon Steel Corporation Engineering Business Headquarters (72) Inventor Shunji Uryu Tobata-ku, Kitakyushu-shi, Fukuoka Nakahara 46-59 New Nippon Steel Corporation Engineering Business Division (72) Inventor Shinpei Suematsu 59-46 Nakahara, Tobata-ku, Kitakyushu-shi, Fukuoka Nittetsu Plant Design Co., Ltd. (72) Inventor Kazunari Yamamoto Osaka 856-4, Oazahara, Takatsuki-shi, Chuoishiishi Co., Ltd. (72) Inventor Tanigakiuchi Hideo 856-4, Oazahara, Takatsuki-shi, Osaka (72) Inventor Kiyoshi Omizo, Kiyoshi Omizo 429 Shinjyo-dori, Shijo-machi, Kyoto, Kyoto, Japan 429 Keihan Head Office Co., Ltd. (72) Inventor Eiji Sake Brewery No. 429, Koizuna-cho, Shinmachi-dori, Shijomachi, Nakagyo-ku, Kyoto 4F059 AA09 BE16 BE51 BK08 BK11 CC04 DA04 DA66 EB20

Claims (3)

[Claims] 1. A first step in which sludge is solid-liquid separated at a dewatering pressure of 1.5 to 4.0 MPa to produce a dewatered cake, and a mass of solid content of the dewatered cake after the produced dewatered cake is crushed. To the second step of adding a cement and / or lime improver in a mass ratio range of 5 to 30%, stirring and mixing, and adding 10 to the mixture formed in the second step.
It comprises a third step of applying a molding linear pressure of 100 KN / cm and press-molding, and a fourth step of curing or crushing the pressure-formed product produced in the third step after curing. A method for treating sludge as material, wherein the material produced by the method has a uniaxial compressive strength of 1.0 KN / cm ² or more and has a lump or sand shape. . 2. The sludge in the first step is used as the sludge for shield work or the collected bottom mud in dredging work, and the amount of the improving material added in the second step is 10% of the solid mass of the dewatered cake. 2. A mass ratio range of ３０30% and a molding linear pressure in the third step of 20〜100 KN / cm.
A method for converting sludge into material as described in the above. 3. A dewatering means for solid-liquid separation of sludge by a filter press to produce a dewatered cake, a crushing means for crushing the dewatered cake, and cement and / or lime for the crushed dewatered cake. A mold comprising an addition / stirring / mixing means for stirring / mixing after the addition of the improving material comprising: and a pair of rolls, and a plurality of concave holes formed opposite to each other on the surface of the rolls. In the hole of the roll for, the mixture is compressed, pressure molding means for pressure molding, and curing the pressure molded product, after curing, curing and crushing means for crushing, characterized by comprising Sludge material conversion equipment.