JPH0639365A - Method and device for producing modified soil by use of waste soil, sludge and ash of incinerated waste or the like - Google Patents

Abstract

PURPOSE:To reutilize waste soil and incineration ash of sludge and waste or the like as resources by sorting coarse aggregate, fine aggregate and sandy substance contained in excavated waste soil, draining water therefrom to pro duce cake, mixing sludge and ash of incinerated waste or the like, forming granular soil from the mixture, sintering the granular soil and solidifying it. CONSTITUTION:While excavated waste soil 1 is washed with water, coarse aggregate 7 contained in waste soil 1 is sorted by a sorting means A thereof. Fine aggregate 9 is sorted from muddy waterlike waste soil wherein the coarse aggregate 7 has been removed by a sorting means B of fine aggregate 9. Sandy substance 20 is sorted from waste soil wherein the fine aggregate 9 has been removed by a sorting means C of sandy substance 20. Residual muddy waterlike mud is dehydrated and cake is obtained by a producing means of cake. Sludge and ash of incinerated waste or the like are mixed with the cake by a mixing means thereof. Granular soil having a prescribed size is formed form the mixture of the cake and incineration ash by a granulation means. Furthermore granular soil is sintered by a burning means and solidified.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing improved soil by incineration ash such as soil discharge, sludge and waste used in the construction and civil engineering industries.

[0002]

2. Description of the Related Art The present inventor selects rough aggregate, fine aggregate, sand content, and mud content from the excavated residual soil generated at the site when burying construction such as water and sewage on roads, etc. We have already proposed a method and an apparatus for using fine aggregate as concrete aggregate and sandy content as concrete sand or sand cushion, etc., and sintering and solidifying only the remaining mud as a recycled material. (Refer to Japanese Patent Laid-Open No. 2-14858) With this method and device, it is possible to effectively use the entire amount of the large amount of excavated soil left at construction sites for civil engineering and construction materials, and to be involved in disposal of excavated soil. It was effective for use because it eliminated transportation and labor, and demonstrated sufficient road surface support and strength for roadbed materials and backfill materials.

As described above, for the treatment of the excavated soil,
By reusing this, the conventional problem could be solved.

On the other hand, the amount of sewer sludge and waste discharged continuously and in large quantities every day is greatly reduced by incineration. Therefore, the problem is temporarily solved by landfilling the remaining incineration ash. However, now that it is difficult to secure this disposal site, the disposal of incineration ash, which increases in proportion to the amount of sewage sludge and waste, has become a new major problem.

Therefore, in some cases, the incinerated ash was mixed with the main raw material in an appropriate amount and reused in the production of blocks and ceramic tubing, but the amount of incinerated ash used in this production is the total amount of the emission. Since it is small relative to the amount, it is the current situation that it does not solve the fundamental problem of incineration ash treatment.

[0006]

The present invention has been made in order to solve the above-mentioned problems, and selects excavated residual soil generated at a construction site into coarse aggregate, fine aggregate, sandy matter and mud matter. Coarse and fine aggregates are used for concrete aggregates, sandy components are used for concrete sand and sand cushions, and only the remaining mud is sinter-solidified to be recycled material. Not only can the problems caused by the transportation process be completely solved by using the entire amount of excavated soil that has been generated effectively as materials, but the incineration ash that was difficult to dispose of can be removed by soil. It is an object of the present invention to provide a method and a device for producing discharged soil, improved soil by incineration ash such as sludge and waste, which can be reused as a resource by being mixed into recycled material and sintered into particles.

[0007]

The means of the present invention for achieving the above-mentioned object comprises a step of selecting coarse aggregate in excavated soil while washing it with water, and removing the coarse aggregate. The step of selecting fine aggregate from the muddy water-like discharged soil, the step of selecting sandy matter from the discharged soil from which the fine aggregate is removed, and the remaining muddy water-like mud is dehydrated to obtain a cake A process, a process of mixing incineration ash such as sludge and waste to this cake, a granulation process of forming a granular soil of a predetermined size by a mixture of the cake and incinerator ash, and sintering the granular soil to form a solid And the firing process,
The method for producing improved soil by incineration ash such as soil discharge, sludge and waste is equipped with.

Further, means for selecting coarse aggregate in the excavated earth while washing it with water, means for selecting fine aggregate from the muddy water-like earth from which the coarse aggregate has been removed, Means for selecting sandy matter from the soil removed from aggregates, means for dehydrating the remaining mud-like mud to obtain a cake, and sludge /
A means for mixing incinerated ash such as waste, a granulating means for forming a granular soil of a predetermined size by the mixture of the cake and the incinerated ash, and a burning means for sintering and solidifying the granular soil. It consists of a device for producing improved soil by using discharged ash, incinerated ash such as sludge and waste.

[0009]

The present invention configured as described above has the following operations. When the soil excavated from the burial site such as water and sewage, gas, telephone, etc. is supplied to the coarse aggregate sorting means, the primary sorting net in this device will generate a large block from the soil.
For example, coarse aggregate of 150 mm or more is separated and sent to the coarse aggregate reservoir, and the soil removed from this coarse aggregate is sent to the next fine aggregate selecting means.

The fine aggregate selection means separates 40 to 150 mm of fine aggregate from the soil by the upper secondary sorting mesh, and separates 5 to 40 mm fine aggregate from the lower tertiary sorting mesh. rear,
The two soils are mixed and sent to the fine aggregate reservoir, and the waste soil from which the fine aggregate has been separated is sent to the next sand content sorting means.

This sandy material sorting means is supplied with soil discharged from the lower end of the inclined separating cylinder, pushes up the sandy material of 0.1 to 5 mm by an internally provided feed spiral and transfers it, and from the upper end to the sandy material pool. The mud of less than that is sent together with water from the overflow of the separation cylinder to the next dehydration means.

The dewatering means compresses and dewaters the mud sent into a large number of filters to have a water content of, for example, 28 to
A cake whose water content is adjusted to a low humidity of 30% is obtained. This cake is mixed with incinerated ash such as sludge and waste and sent to the baking means.

Means for mixing incinerated ash such as sludge and waste is
In advance, for example, the ash remaining after the sewer or other waste is incinerated at a high temperature in an incinerator is stored in a tank, and the incinerated ash is mixed with the cake at a predetermined ratio to the granulating means. Sent.

The granulating means molds the mixture of the cake produced by the dehydrating means and the incinerated ash produced in the incinerator into a predetermined grain size, for example, 3 cm single grain.

The means for calcining the granular soil is to store the granular soil in a calcining furnace and bake it at an appropriate calcining temperature and time to obtain a solid calcined material in which fine particles of the granular soil are calcined. Coarse aggregates and fine aggregates are used as aggregates for concrete, and sand content is a sand cushion laid under the buried pipe, or
Used as a barrier material.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an apparatus suitable for an embodiment of the method for producing improved soil by discharging soil, incineration ash such as sludge and waste according to the present invention will be described below with reference to the drawings.

FIG. 1 shows a schematic flow sheet of the method of the embodiment of the present invention, and FIGS. 2 to 3 show the outline of the apparatus of the embodiment of the present invention. Material selection means B, sandy content selection means C, and cake generation means D
And mixing means E for incineration ash such as sludge and waste, and granulation means F
And a means G for burning the soil.

The above-mentioned coarse aggregate selecting means A is
The excavated residual soil 1 discharged at the civil engineering / construction site, etc. is put into a fixed-quantity cutting hopper 4 consisting of a conveyor 2 and a receiving frame 3 and is supplied to the primary sorting net 5 connected thereto in fixed amounts. Does not pass through the mesh 6 of the primary sorting net 5 15
The coarse aggregate 7 having a size of 0 mm or more and the coarse aggregate 7 or less that pass through the mesh 6 are sorted, and the coarse aggregate 7 is discharged from the end of the primary sorting mesh 5 and dropped into the coarse aggregate receiver 8 and passes through the mesh 6. The fine aggregate 9 is dropped onto the recycled water mixed sludge gutter 10 below.

At this time, by sprinkling water from the water supply pipe 11 facing the inside of the primary sorting net 4, the thrown soil is washed with water while being stirred as the primary sorting net 4 rotates. The mud soil adhering to the coarse and fine aggregates 7 and 9 in the soil is washed away, and the coarse aggregate 7 and the fine aggregate 9 are separated in the primary sorting net 4, and at the same time, a suspension of the mud soil is generated. The suspension and the fine aggregate 9 are sent out from the reclaimed water mixed sludge gutter 10.

The fine aggregate 9 sorting means B receives the suspension of mud falling from the recycled water mixed sludge gutter 10 in the secondary sorting net 12, and the 5 mm size one passing through the mesh 13 It is sent together with muddy water to the lower gutter 14 and the mesh
Fine aggregate 9 of 50-150 mm that does not pass 13 is sent to crusher 15 from the end of this secondary sorting net 12, crushed to 40 mm and sent to crushed sand maker 16 together with muddy water to adjust to 5-40 mm. Then, this is sorted into 5 mm or more and 5 mm or less by a vibrating sieve 17, and those of 5 mm or more are sent to the crusher 15 again and repeatedly crushed to be gradually granulated, Those having a diameter of 5 mm or less are sent together with muddy water to the sorting means C for the sandy matter 20 in the next step.

The means C for selecting the sand content 20 described above sends the suspension of mud containing the sand content 20 from the trough 14 to the start end of the sand classifier 18, and the sand content 20 of 0.1 to 5 mm is obtained. Is the sand classifier 18
After reaching the end of the above, it is sent to the sandy sand reservoir through the chute 19 and stored there, and is used as a high quality wash sand 20 with a high commercial value.

On the other hand, a suspension of mud having a viscosity of 0.1 mm or less and silt is stored in a storage tank 22 via a feed cylinder 21 and sent to a sedimentation means H for mud.

The mud settling means H stores the mud having a particle size of 0.1 mm or less, which is sent from the storage tank 22 by the pump 23, in the settling tank 24, and precipitates the mud in the mud to the bottom of the tank. While being stirred by the stirring blade 24a, the pump 25 sends it to the storage tank 26 for storage.

In the settling tank 24, the water of the supernatant is sent to a fresh water tank 27 for storage and is supplied to the primary sorting net 5 as regenerated water by a pump 28.

The above-mentioned cake producing means D is for dehydrating the mud to a predetermined water content to produce a press cake (clay plate) 29. The mud in the storage tank 26 is filled with a large number of filters inside. It is sent by a pump 32 into a filter press 31 provided with 30 and the filter 31 is squeezed by a pressurizing means 33 such as a hydraulic cylinder to squeeze out water in the mud, and a water content of 28 to 30% between the filters 30. Form a low-humidity cake 29 and add this cake 29 to the bottom cake puddle 34.
Received from the cake reservoir 34 and sent to the cake quantitative cut-out hopper 36 having a conveyor 35 at the bottom, and the conveyor 35
The crushing machine 37 in which the stirring rod meshes at the end of the crushing machine crushes the cake 29 into an indefinite shape of about 40 mm. Mixed with incinerated ashes 39.

The above-mentioned means E for mixing incinerated ash of sludge, waste, etc., is the sludge of sludge dredged from the sewer, ocean, lakes, etc. in the cake 29 produced by the means D, or other general or A certain amount of the incineration ash 39 remaining after firing industrial waste is mixed, and the one that has been fired in an incinerator (not shown), etc. is stored in a ton pack etc. in advance and prepared. While adjusting the payout amount from the silo 40 containing the ash 39 by the screw conveyor 41, the cake 29 which is melted by being connected to the crusher 37 is dropped onto the chute 38 to be transferred, or granulation described below. Supply into the hopper 42 of the means F.

The mixing ratio of the cake 29 and the incinerated ash 39 is 70:30 to 60:40 when the ratio of the cake 29: incinerated ash 39 is 70%.
However, it is preferable to use both waste materials 29 and 39 so as to efficiently consume them, and it is possible to use the incineration ash 39 at a ratio of nearly 50%. However, when this is used for backfilling of the ground or as a roadbed material, it may adversely affect the PH value of the soil, so the above ratio is preferable.

The above-mentioned granulating means F is for forming a granular soil 43 of a predetermined size from a mixture of the cake 29 and incinerated ash 39, and a screw feeder 45 is provided in a frame 44 having a hopper 42 on the upper part thereof. Is rotatably attached, the mixed soil charged into the hopper 42 is pressure-fed to the granulation cylinder 46 by the screw feeder 45 while being stirred and mixed, and has a predetermined diameter from the outlet 47 at the end thereof. (10-50m
m), for example, one that is formed into a thickness of about 30 mm and is extruded in sequence, and this is cut by a cutting means 48 arranged in the vicinity of the delivery port 47 to a length of about 30 mm for each grain soil.
It is cut into 43 and dropped to the lower conveyor 49 to carry it to the next firing means G.

The above-mentioned firing means G is used to sinter the formed grain soil 43 in a conventionally known firing furnace 50 to solidify it, and the grain soil 43 is adjusted to a predetermined water content or less in advance. It is dried as described above, and the carry-out conveyor 49
The end of is connected to the beginning of a horizontally long rotary drum type drying oven 51 suspended on a slight downslope, and while it is rotating inside the rotary drum by the hot air sent inside, the temperature is 500 ° C for about 15 minutes. While moving in the process of (1), drying is performed with the water content adjusted to around 6%.

The grain soil 43 which has been dried in a predetermined manner is discharged from the end of the rotary drum and sent to the firing furnace 50 via the conveyor 52. This firing furnace 50 can be fired in large quantities at one time. It is preferable to use a batch type or continuous type, and the higher the firing temperature, the better the hardness and strength of the fired material, but normally, if the firing temperature is within the range of 950 to 1000 ° C for about 15 to 20 minutes, the bone The hardness and strength required for the material are satisfied, and the furnace is constructed, for example, by installing a caster and a horizontally long rotating cylinder covered with refractory bricks at an inclination of about 5 degrees, and the conveyor 52 Input port connected to the end of
The dry granular soil 43 supplied to 53 is solidified by being sintered while being moved in the rotary cylinder while being rotated by the hot air that is pumped inside, and the sintered granules that have reached the end of the rotary cylinder. Sat 54
Has a high residual heat and is sent to the cooling means J.

In this cooling means J, the sintered grained soil 54 is inclined by 2 to 3 degrees and is supplied into a rotating cylinder suspended so that it is naturally discharged. It cools down to about 200 ℃ in about 20 minutes, and it is taken out from the end of this rotary drum and the sintered grain pool
It is stored in 55.

The fired grained soil 54 thus produced is reused for artificial quarrying such as backfill material and roadbed material.
Further, the sintered soil 54 may be mixed with the crushed concrete 56 discharged at the civil engineering / construction site or the like to form the reclaimed soil 57, and the excavated residual soil is effectively used.

When this quarry was laid for the roadbed during road construction, solidified and then asphalt paved, and the road was immediately opened, there was no change in the road surface even when heavy heavy vehicles moved in and out. Even if the quarry was immersed in groundwater for a long period of time, it did not return to the muddy state before sintering.

Further, this artificial quarry does not dissolve due to water in the ground, becomes alkaline soil due to the mixed burning ash, and is harmful to cadmium, lead, arsenic, cyanide, etc. contained in the waste. The remaining amount of the substance was well below the standard value, and there was no concern about groundwater.

[0035]

Industrial Applicability As described above, the method and apparatus for producing soil, improved soil by incineration ash of sludge, waste, etc. according to the present invention are used to sequentially remove excavated soil generated in burial works such as water and sewerage on roads. If it is processed through a process, it will be sorted into coarse aggregate, fine aggregate, sandy matter, and mud from the discharged soil, and the coarse and fine aggregate will be used as aggregate for concrete.
The sand content is used for sand cushions such as buried pipes and heat insulating layer materials, and the remaining mud is mixed with fired ash that has been previously incinerated to form grain soil, which is then fired in a furnace to produce artificial crushed stones and backfill materials Alternatively, slope backfilling material can be obtained, and the site can be backfilled only with this recycled material. Therefore, in normal buried pipe construction, excavation discharge soil is neither carried out nor carried in. Can be completed.

When the mud is fired, the particles are firmly bound to each other. Therefore, when the mud is used as a roadbed material, it has a sufficient bearing capacity for the road surface. Since the road can be used immediately without a curing period, it can be used for piercing work that does not leave much room for construction.

Since the mud is solidified by sinter, even if it is piled up and exposed to wind and rain, the sinter does not scatter or muddy with rainwater, and it does not flow out, so it is easy to manage. It can be mass-produced and long-term stocked.

In particular, in the present invention, a cake-like viscous material mixed with baked ash and baked is reused as an artificial quarry, and therefore remains after incineration of sludge or waste. The incinerated ash can be reused effectively, and a great social contribution can be expected due to the lack of disposal of this ash and natural quarry that are currently in trouble. It has special effects such as.

[Brief description of drawings]

FIG. 1 is a flow sheet diagram showing an outline of a manufacturing process according to the present invention.

FIG. 2 is an explanatory view schematically showing an apparatus for a step of selecting excavated residual soil in FIG.

FIG. 3 is an explanatory view schematically showing an apparatus in a step of treating the mud in FIG. 1 into a cake shape.

4 is an explanatory view showing an apparatus in a step of granulating the cake in FIG. 1 and then sintering.

5 is a front view showing the sintered grained soil formed in FIG. 1. FIG.

[Explanation of symbols]

 A means for selecting coarse aggregate B means for selecting fine aggregate C means for selecting sand content D means for producing cake E means for mixing incinerated ash such as sludge and waste F granulation means G firing means 1 excavated soil 7 rough Aggregate 9 Fine aggregate 20 Sand content 29 Cake 39 Incinerated ash 43 Grain soil 54 Sintered grain soil

Claims (2)

[Claims] 1. A step of selecting coarse aggregate in the excavated earth while washing it with water, a step of selecting fine aggregate from the muddy water-like earth from which the coarse aggregate has been removed, A step of selecting sandy matter from the discharged soil from which the aggregate has been removed, a step of dehydrating the remaining mud-like mud to obtain a cake, and a step of mixing this cake with incinerated ash such as sludge and waste. Discharged soil and sludge characterized by comprising a granulation step of forming a granular soil of a predetermined size by a mixture of the cake and incinerated ash, and a firing step of sintering and solidifying the granular soil.・ Method for producing improved soil by incineration ash such as waste. 2. A means for selecting the coarse aggregate in the excavated soil while washing it with water, a means for selecting the fine aggregate from the muddy water-like soil from which the coarse aggregate has been removed, Means for selecting sandy matter from the discharged soil from which aggregates have been removed, means for dehydrating the remaining mud-like mud to obtain a cake, and means for mixing incinerated ash such as sludge and waste into this cake Discharged soil and sludge characterized by comprising a granulating means for forming a granular soil of a predetermined size by a mixture of the cake and incinerated ash, and a burning means for sintering and solidifying the granular soil.・ Production equipment for improved soil using incinerated ash such as waste.