JP5222879B2 - How to recycle construction sludge - Google Patents

Description

The present invention relates to a method for recycling construction sludge.

Turbid water generated at a construction site is generally treated by a turbid water treatment facility, and construction sludge is discharged as a result of the treatment.
Construction sludge is discharged in the form of a dewatered cake that has been dewatered to some extent by a filter press, but this sludge is not sufficiently dewatered and is not treated to a state suitable for reuse. For this reason, this sludge must be treated as industrial waste.

Construction sludge as industrial waste must be treated at the final disposal site, so a final disposal site must be secured near the construction site, and even if a final disposal site is secured, There is a problem that transportation costs are required for transportation to the final disposal site.
In addition, simply treating construction sludge as industrial waste does not effectively use resources, and it is required to recycle these construction sludge.
The present invention has been made under the above circumstances, and its purpose is to provide a method for recycling construction sludge that can effectively recycle construction sludge discharged from muddy water treatment facilities such as construction sites. There is to do.

The method for recycling construction sludge according to the present invention includes a dehydration process in which sludge discharged from a muddy water treatment facility such as a construction site is filtered through a high-pressure dehydration, and a polymer solidifying agent is mixed with the sludge dehydrated in the dehydration process. a first mixing step of obtaining a crumb of sludge by said a first pulverization step of pulverizing the Dan grained sludge in the first mixing step, plants sludge has been ground in the first grinding step The second mixing step of mixing the additive material that promotes germination and growth, and the heat generated from the mixture itself by fermenting and stirring the mixture of the sludge mixed in the second mixing step and the additive material against the fermentation step of evaporating the water of the mixture, and a second milling step of generating a greening base material by pulverizing the mixture water content is reduced by the fermentation process, and the greening base material and the seed and fertilizer A third mixing step of generating a mixed material by mixing the agent, characterized by comprising a step blown sprayed onto the construction surface from the blowout while mixing and water the mixed material.

According to the construction sludge recycling method of the present invention, the sludge discharged from the muddy water treatment facility at the construction site is dehydrated by the dehydration step, and the dehydrated sludge is mixed with the polymer solidifying agent by the first mixing step. Aggregated, aggregated sludge is pulverized by the first pulverization process, additive material is mixed with the pulverized sludge by the second mixing process, and the mixture of sludge and additive material is fermented and stirred by the fermentation process. Thus, the mixture in which the moisture is evaporated and the water content is reduced is pulverized in the second pulverization step to be produced as a greening base material.
Such a greening base material is suitable for germination and growth of plants, and unlike conventional methods, it is not necessary to treat sludge as industrial waste at the final disposal site, and it should be used for various greening methods. The construction sludge can be effectively recycled.

It is a whole block diagram which shows the structure of embodiment of the system for enforcing the recycling method of the construction sludge of this invention. It is a block diagram which shows the structure of the spraying apparatus which makes a part of system for enforcing the recycling method of the construction sludge of this Embodiment.

Next, we described together with a system for recycling process of construction sludge of the present invention with reference to the drawings.
FIG. 1 is an overall configuration diagram showing a configuration of a system for carrying out a construction sludge recycling method of the present invention, and FIG. 2 is a diagram of a system for carrying out a construction sludge recycling method of the present embodiment. It is a block diagram which shows the structure of the spraying apparatus which makes a part.

First, the overall configuration of the construction sludge recycling system will be described with reference to FIG.
A construction sludge recycling system (hereinafter simply referred to as a recycling system) 1000 includes a muddy water treatment facility 100, an intermediate pressure filter press 200, an excavator car 300, 400, 500, a primary fermentation yard 600A, a secondary fermentation yard 600B, and a tertiary. It includes a fermentation yard 600C, a bagging yard 600D, a spraying device 700, and the like.

Hereinafter, it demonstrates according to the order of the process of each construction sludge.
The muddy water treatment facility 100 guides muddy water generated at a construction site to a settling water tank, mixes and stirs a predetermined chemical agent to sink suspended matter, and separates muddy water into subsidence deposits, that is, sludge and treated water. The muddy water treatment process is executed.
The separated sludge is conveyed to the medium pressure filter press 200 by a pump or the like. The treated water is appropriately treated to meet environmental standards and re-released into the river.
In addition, since the said muddy water contains cement content, such as grout drainage and concrete curing water which generate | occur | produce at the time of concrete injection | pouring, it exhibits alkalinity. Therefore, as described later, it is preferable to neutralize the muddy water by blowing carbon dioxide gas or the like into the muddy water so as not to inhibit the germination of the seeds and to perform the treatment from alkaline to neutral.

The medium-pressure filter press 200 performs a dehydration process in which the sludge separated in the muddy water treatment facility 100 is filtered, for example, in a bag-like filter, dehydrated by high-pressure dehydration to remove moisture from the sludge, and the dehydrated cake 10 is formed. To do.
The sludge dehydrated by the medium-pressure filter press 200 has a water content of about 40% or less and a corn index of about 400 kN / m ² or more, that is, it corresponds to the third type construction generated soil. .
Accordingly, the dehydrated cake 10 can be used as the third type construction generated soil (for example, the back soil of the structure, that is, the soil used for backfilling).

The shovel car 300 mixes and stirs the dehydrated cake 10 and the polymer solidifying agent by a self-propelled vehicle body 310, an arm 320 provided on the vehicle body 310, and a first screen bucket 330 provided at the tip of the arm. to run the first mixing step to obtain a Dan grained sludge 12 by. The first screen bucket 330 is formed in a sieve shape.
The polymer-based solidifying agent serves to crosslink and aggregate the soil particles by covering the soil particle surface of the dewatered cake 10. When the soil particles are crosslinked and aggregated, the aggregated sludge 12 described below is efficiently pulverized.

Next, the sludge 12 aggregated is put into the first screen bucket 330 attached to the tip of the arm of the excavator 300, and the aggregated sludge 12 is pulverized so that the diameter thereof is about 40 mm or less. A 1st grinding | pulverization process is performed. The first screen bucket 330 that is configured to the sludge 12 can pulverizing a diameter of less than about 40 mm.

The shovel car 400 includes a self-propelled vehicle body 410, an arm 420 provided on the vehicle body 410, and a first screen bucket 430 provided at the tip of the arm (having the same function as the first screen bucket 330 described above). Have.
The excavator 400 then drives the arm 420 and the first screen bucket 430 to perform the second mixing step of obtaining the mixture 16 by mixing and stirring the aggregated sludge 12 and the additive material 14. you.
The additive material 14 promotes germination and growth of the plant, and includes active chicken manure, a soil conditioner, and a base material.
Active chicken manure has an action of decomposing an alumina component contained in the sludge, that is, a component that inhibits germination of plants, by being mixed with sludge and subjected to fermentation described later. The soil conditioner contains minerals necessary for plants and corresponds to fertilizer. The base material includes compost.
Moreover, the mixing ratio of the sludge 12 aggregated and the additive material 14 is 50:50 (volume ratio), for example.

The mixture 16 is conveyed by the shovel car 400 to the primary fermentation yard 600A, where primary fermentation ripening is performed.
The mixture 16 generates heat in the process of fermentation, and the water is evaporated by adjusting the water content by appropriately mixing and stirring the first screen bucket 430 of the shovel car 400 in the process of fermentation.

The mixture 18 that has been fermented and matured in the primary fermentation yard 600A is transported to the secondary fermentation yard 600B by the shovel car 400, where secondary fermentation ripening is performed.
The mixture 18 generates heat in the process of fermentation, and the water is evaporated and the water content is adjusted by appropriately mixing and stirring the first screen bucket 430 of the shovel car 400 in the process of fermentation. It is the same.

Further, the mixture 20 that has been fermented and matured in the secondary fermentation yard 600B is transported to the tertiary fermentation yard 600C by the shovel car 400, where tertiary fermentation aging is performed.
The mixture 20 generates heat in the process of fermentation, the water is evaporated by mixing and stirring as appropriate by the first screen bucket 430 of the shovel car 400 in the process of fermentation, and the water content is adjusted. A mixture 22 having a water content reduced to about 25% to 35% is obtained.
Primary to tertiary fermentation ripening described above that corresponded to the fermentation process of the claims.

The mixture 22 whose water content has been adjusted in the tertiary fermentation yard 600C is transported by the shovel car 400 to the bagging yard 600D.
The shovel car 500 is prepared in the bagging yard 600D.
The shovel car 500 includes a self-propelled vehicle body 510, an arm 520 provided on the vehicle body 510, and a second screen bucket 530 attached to the tip of the arm. The second screen bucket 530 is formed in a sieve shape.
The excavator 500 then obtains the greening base material 24 by putting the mixture 22 in the second screen bucket 530 attached to the tip of the arm and crushing the mixture 22 so that the diameter thereof is about 20 mm or less. Perform the grinding process. The second screen bucket 530 is configured to pulverize the mixture 22 to a diameter of about 40 mm or less.
Next, the greening base material 24 is packed in a bag 26 for transportation and storage. The bag 26 has a capacity of about 1400 liters, for example.

  The greening base material 24 thus generated can be used not only for a greening method using a spraying device 700 as described later, but also as a fertilizer.

Next, with reference to FIG. 2, the greening method which performs greening by spraying the greening base material 24 on a slope (5) using the spraying apparatus 700 is demonstrated.
First, the configuration of the spraying device 700 will be described.
The spraying device 700 includes a measuring device 702, a belt conveyor 704, a switchboard 706, a motor generator 708, an electric wire 709, an air compressor 710, a pumping pump 712, a water tank 714, a water hose 716, an air hose 718, a mortar spraying machine 720, materials. A pressure hose 722 and the like are provided.

The measuring device 702 is used for measuring a predetermined amount of the greening base material 24.
The engine generator 708 is for supplying power to the belt conveyor 704, the air compressor 710, and the pumping pump 712 via the electric distribution board 706 via electric wires 709.
The belt conveyor 704 is for conveying the greening base material 24 to the mortar sprayer 720.
The air compressor 710 is for supplying compressed air to the mortar sprayer 720 via the air hose 718.
The pump 712 is for pumping water from a water source, for example, a river 713 or a water tank 714, and supplying it to the other end 722B of a material pressure hose 722 of a mortar sprayer 720 described below through a water hose 716. .
The water hose 716 has one end 716 </ b> A communicating with the pumping pump 712, and the other end 716 </ b> B communicating with a location near the outlet 722 </ b> C (the other end 722 </ b> B) of the pressure feeding hose 722.

The mortar sprayer 720 includes a main body 720A, and a material pressure feed hose 722 having one end 722A communicating with the main body 720 and the other end 722B opened as a blowout port 722C.
The other end 722 </ b> B of the water hose 716 is communicated with the other end 722 </ b> B so that water that is pumped through the water hose 716 is supplied.
The main body 720A mixes the greening base material 24, seeds, slow-release fertilizer and bonding agent supplied by the belt conveyor 704 to generate a mixed material (third mixing step) , and this mixed material is used as an air compressor. The air pressure supplied from 710 is fed into the material pressure hose 722 for pressure feeding. In addition, in FIG. 2, illustration is abbreviate | omitted about a seed, a slow-acting fertilizer, and a binder.
The mixed material supplied to one end 722A of the material pumping hose 722 is pumped through the material pumping hose 722 and blown out from the outlet 722C of the other end 722B.

  On the slope 50 (corresponding to the construction surface in the claims) to be greened, a metal mesh 52 is attached by a holding member such as an anchor pin 54 so as to cover the slope 50.

Next, the procedure of the greening method using the spraying apparatus 700 configured as described above will be described.
The greening base material 24 packed in the bag 26 is transported to a greening site having a slope 50 to be greened.
The greening base material 24 taken out from the bag 26 is weighed by a predetermined amount by a measuring device 702 and conveyed to a mortar sprayer 720 by a belt conveyor 704.
The greening base material 24 conveyed by the belt conveyor 704 is put into the main body 720A together with a predetermined amount of seeds, a slow-release fertilizer, and a bonding agent, and mixed in the main body 720A to become a mixed material 74. The mixed material 74 generated by the main body 720 </ b> A is pumped through the material pumping hose 722. At the same time, the water pumped by the pumping pump 712 is pumped from one end 716A of the water hose 716 to the other end 716B. Therefore, the mixed material and water are mixed and sprayed from the outlet 722C toward the inclined surface 50 at the outlet 722C.
The mixed material 74 mixed with water is sprayed onto the slope 50 and the wire net 52 to form a growth base 60 containing seeds. Thereby, greening of the slope 50 is performed.
In addition, the greening method of forming a thick layer by mixing and spraying the above-mentioned greening base material, seeds, slow-release fertilizer, bonding agent, and water is a well-known method and is referred to as a thick layer base material spraying method.

  In addition, the inventors changed the mixing ratio (volume ratio) of the sludge 12 and the additive material 14 to make a greening base material 24, put it in a flower pot, conduct a germination test, and investigated the germination ratio. Based on the results, the actual slope (slope) was greened using the greening base material 24 prepared by appropriately setting the mixing ratio (volume ratio) of the sludge 12 and the additive material 14 described in the above embodiment. The germination situation was tested and it was demonstrated that germination and growth were good. Although the said mixing ratio is not limited, For example, it can construct also by 50:50.

According to recycling how the sludge according to the present embodiment as described above, it is possible to generate a greening base material from construction sludge, the greening base material, emergence of the plants, making them suitable for growth Therefore, it can be used for various greening methods, and unlike conventional methods, it is not necessary to treat sludge as industrial waste at the final disposal site, and construction sludge can be effectively recycled.
Moreover, since no lime or cement-based additives are used for the sludge treatment, no cost is required.
In addition, greening base material is produced by mixing additive materials including active chicken manure, soil improvement material, and base material into dehydrated cake, so that it is ecologically controlled against plant diseases, resistant to diseases, and durable. High greening is possible.
In addition, since the greening base material is the same as the greening base material used in various greening methods, it can be constructed in the same way as the conventional greening base material, and the burden on the worker is completely different from the conventional one. Absent.

Incidentally, greening base material 24 produced by the recycling how the present invention is not intended to be limited to use with thick-layer substrate blowing method described in the embodiment described above, a variety of greening method Of course, it can be used.
Moreover, in embodiment mentioned above, although the fermentation process was made into the primary thru | or the tertiary three steps, the frequency | count of a fermentation process is not limited to this.
In addition, the sludge pulverization in the first pulverization step has a diameter of 40 mm or less, and the mixture pulverization in the second pulverization step has a diameter of 20 mm or less, but these dimensions can be changed.
In addition, the moisture content of the sludge dehydrated in the dehydration process is set to 40% or less, and the moisture content of the mixture in which moisture is evaporated in the fermentation process is set to 25% or more and 35% or less, but these moisture contents can be changed.

Also, the construction sludge recycling method of the present embodiment includes a dehydration process in which sludge discharged from muddy water treatment facilities such as construction sites is filtered and dehydrated at high pressure, and the sludge dehydrated in the dehydration process is polymerized. A first mixing step for obtaining sludge aggregated by mixing a solidifying agent, a first crushing step for crushing sludge aggregated in the first mixing step, and crushing in the first crushing step. From the mixture itself by fermenting and stirring the mixture of the sludge and the additive material mixed in the second mixing step, the second mixing step of mixing the added material that promotes germination and growth of the plant with the sludge a fermentation step of evaporating the water of the mixture by the heat generated, and a second milling step of generating a greening base material by pulverizing the mixture water content is reduced by the fermentation process, the greening base material and the seed And a third mixing step of generating a mixed to the mixed material and a bonding agent fertilizers, and configured to include a step blown sprayed onto the construction surface from the Symbol mixed material and water and mixed with air outlet a.

Therefore, according to the construction sludge recycling method of the present embodiment, the sludge discharged from the muddy water treatment facility at the construction site is dehydrated by the dehydration step, and the dehydrated sludge is polymerized by the first mixing step. The sludge that has been mixed and aggregated and pulverized is pulverized by the first pulverization process, the additive material is mixed with the pulverized sludge by the second mixing process, and the mixture of the sludge and the additive material is converted by the fermentation process. Fermented and stirred to evaporate the water content and reduce the water content, the mixture is pulverized by the second pulverization step to produce a greening base material.
Such a greening base material is suitable for germination and growth of plants, so it can be used for various greening methods, and unlike conventional methods, sludge must be treated as industrial waste at the final disposal site. No construction sludge can be effectively recycled.

1000 Construction sludge recycling system 10 Dewatered cake 12 Sludge 14 Additive material 16, 18, 20, 22 Mixture 24 Greening base material 100 Turbid water treatment facility 200 Medium pressure filter press 300, 400, 500 Excavator 600A Primary fermentation yard 600B Secondary Fermentation Yard 600C Third Fermentation Yard

Claims (7)

A dehydration process in which sludge discharged from a muddy water treatment facility such as a construction site is filtered and subjected to high pressure dehydration;
A first mixing step of obtaining sludge that has been aggregated by mixing a polymer solidifying agent with the sludge dehydrated in the dehydration step;
A first pulverization step of pulverizing the sludge aggregated in the first mixing step;
A second mixing step of mixing the sludge pulverized in the first pulverization step with an additive material that promotes germination and growth of the plant;
A fermentation step of evaporating water of the mixture by heat generated from the mixture itself by stirring and stirring the mixture of the sludge mixed in the second mixing step and the additive material;
A second pulverization step of pulverizing the mixture whose moisture content has been reduced by the fermentation step to produce a greening base material;
A third mixing step of mixing the greening base material, seeds, fertilizer and bonding agent to produce a mixed material;
A spraying process in which the mixed material and water are mixed and sprayed from the outlet to the construction surface,
A method for recycling construction sludge characterized by comprising: 2. The construction sludge recycling method according to claim 1, wherein the pulverization of the aggregated sludge in the first pulverization step is performed such that the sludge has a diameter of 40 mm or less. The method for recycling construction sludge according to claim 1 or 2, wherein the pulverization of the mixture in the second pulverization step is performed so that the diameter of the mixture is 20 mm or less. The construction sludge according to any one of claims 1 to 3, wherein the high-pressure dewatering of the sludge in the dewatering step is performed such that a moisture content of the dewatered sludge is 40 % or less. Recycling method. The high-pressure dewatering of the sludge in the dewatering step is performed so that the dewatered sludge has a strength of 400 kN / m ² or more in terms of a cone index corresponding to the third type construction generated soil. The method for recycling construction sludge according to any one of 1 to 3. The evaporation of water in the mixture by fermentation process, the construction of any one claim 1 to 5 water content of said mixture is characterized by being carried out so as to to 35% or less than 25% Sludge recycling method.   The additive material mixed into the sludge in the second mixing step is an active chicken manure for decomposing an alumina component contained in the sludge, a soil conditioner containing minerals, and a base material containing compost. The method for recycling construction sludge according to any one of claims 1 to 6, wherein at least one is included.

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