JP2001340839A - Industrial waste treatment apparatus and industrial waste treatment method - Google Patents

Abstract

(57) [Problem] To eliminate the generation of industrial waste in a ready-mixed concrete factory by solidifying, crushing and reusing cake obtained by dewatering the washing wastewater of a mixer truck. The purpose is to: SOLUTION: A washing device for washing ready-mixed concrete adhering to a mixer truck, a separating device for separating sand and gravel from washing wastewater discharged from the washing device, and a device for separating water in wastewater discharged from the separating device. A dehydrator for dewatering, a crusher for crushing a mixture of the solidified product dewatered and solidified by the dehydrator and the solidified returnable concrete, and the crushed material in the crusher is reused as a roadbed material or the like. Closed industrial waste treatment equipment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an industrial waste processing apparatus and an industrial waste processing method, and more particularly to a processing apparatus and a processing method for reusing all excess ready-mixed concrete discharged from a mixer truck. .

[0002]

2. Description of the Related Art A large amount of ready-mixed concrete is used in construction and civil engineering work sites. This ready-mixed concrete is used in a factory and a work site where a batcher plant (hereinafter referred to as BP) in which a mixer truck produces ready-mixed concrete. And carry it back and forth. However, after a day's work,
If the mixer truck is left as it is, the ready-mixed concrete remaining inside the mixer will solidify, so it is necessary to clean the inside of the mixer, including the excess ready-mixed concrete returned to the factory as returned ready-mixed concrete.
However, since the washing water contains sand and gravel in addition to concrete, a wastewater treatment device was required.

Conventionally, a wastewater treatment apparatus as shown in FIG. 1 has been used. That is, the excess ready-mixed concrete of the mixer truck 1 including the returned ready-mixed concrete is washed by the washing device 2, and the washing wastewater washed by the washing device 2 is sent to the aggregate classifier 3.

The above-mentioned aggregate classifier 3 has a rotating inner cylinder which has a cylindrical shape as a whole, has an axial center inclined at a certain angle from the horizontal, and has a large number of pores and a plurality of spiral projections. When the rotating inner cylinder rotates, the sand 8 and the gravel 9 are automatically separated from the washing wastewater sent from the washing device, and the sand 8 and the gravel 9 are collected.

The waste water from which the sand 8 and the gravel 9 have been separated is introduced into a fine sand recovery machine 4 composed of a cyclone, and fine sand with heavy particles is separated by centrifugal force. The sand is separated by the aggregate classifier 3 and collected with the sand.

The wastewater from which the fine sand has been removed by the fine sand recovery machine 4 is sent to a stirred water tank 5 and stored in the stirred water tank 5. The stirring water tank 5 is provided with stirring blades (not shown). The stirring blades homogenize the sludge water in the water tank, and then the uniformized sludge water is sent to the dehydrator 6.

The dewatering machine 6 dewaters sludge water by a method such as pressurization. Then, when dewatered by the dehydrator 6, solid sludge called so-called cake is generated, but this cake has conventionally been discarded as industrial waste.

On the other hand, the water dehydrated by the dehydrator 6 is sent to a supernatant water tank 7, and the supernatant water is used as a kneading water in B · P11 for producing fresh concrete in a factory.

[0009]

A conventional wastewater treatment apparatus has the above-mentioned structure. In recent years, industrial waste has become a major social problem, as it has been widely taken up by the media.Based on this, sludge separated and collected by wastewater treatment equipment is mixed in when new ready-mixed concrete is produced. Attempts were made to reuse it.

Although it is possible to use concrete as a concrete if the mixing ratio to new ready-mixed concrete is within 3%, the quality of concrete deteriorates by that much, and depending on the place where concrete is used, It could not be mixed into concrete and reused, and the resulting cake had to be disposed of as industrial waste.

The so-called cake after dewatering with a dehydrator is brittle and easily broken, but when the cake is solidified by, for example, leaving it between soils, the strength of the cake is at least 8N in a few days. (New Wootton) and found that when the solidified material is crushed by a crusher, the solidified material can be crushed as a moderate crushed piece if the strength of the solidified material is 8N or more.

The present invention is based on such knowledge, and an object of the present invention is to provide an industrial waste treatment apparatus and an industrial waste treatment method that solve the above-mentioned problems of the conventional wastewater treatment apparatus.

[0013]

SUMMARY OF THE INVENTION A washing device for washing fresh concrete adhering to a mixer truck, a separating device for separating sand and gravel from washing wastewater discharged from the washing device, and a separating device for discharging sand and gravel from the separating device. A dehydrator for dehydrating water in the wastewater, a crusher for crushing a mixture of a solidified product dewatered by the dehydrator and solidified by, for example, standing, and a solidified returnable concrete, comprising a crusher, This is a closed type industrial waste treatment device that recycles crushed material as roadbed material, etc., and separates sand and gravel from the washing device that cleans fresh concrete adhering to the mixer truck and the washing wastewater discharged from the washing device. Separation device, a dehydrator that dewaters the water in the wastewater discharged from the separation device, a kneader that kneads the solids dewatered by the dehydrator and the ready-mixed concrete, And a crusher for crushing the kneaded material in the kneader solidified by means such as placing the crushed material in the crusher and a closed-type industrial waste treatment apparatus that is reused as a roadbed material and the like, A closed industrial waste treatment device that transports a mixture kneaded by a kneader to a solidification place by a transporting means such as a mixer truck.

Further, a stirring water tank is provided between the separating device and the dehydrator, and a supernatant water tank for storing water dehydrated by the dehydrator is provided. It is reused as kneading water for production or washing water for washing the mixer truck. The strength of the solidified matter produced and solidified by the dehydrator is 8N or more.

Further, a step of solidifying the returned raw concrete, a step of dehydrating the washed raw concrete, a step of solidifying the solid dehydrated in the dehydrating step, for example, by leaving it to stand, and a step of solidifying the solid produced in the both solidifying steps It is a closed type industrial waste treatment method comprising a step of crushing and a step of reusing the crushed material generated in the crushing step as a roadbed material or the like, wherein the step of dewatering the washed raw concrete and the step of dewatering in the dehydration step are performed. A step of kneading the solid matter and the returned ready-mixed concrete, a step of solidifying the kneaded matter in the kneading step, for example, by standing, a step of crushing the solidified matter generated in the solidifying step, and a step of crushing the solidified matter generated in the solidifying step. Reusing the crushed material as roadbed material or the like, and a method for dewatering the washed raw concrete, and returning the solid matter dehydrated in the dewatering step A step of kneading the ready-mixed concrete, a step of transporting the kneaded material in the kneading step to a solidification place, a step of solidifying the kneaded matter transported to the solidification place by, for example, standing, and the solidification generated in the solidification step A closed type industrial waste treatment method comprising: a step of crushing an object; and a step of reusing the crushed object generated in the crushing step as a roadbed material or the like.

Further, the washing ready-mixed concrete treatment includes a washing step of washing the washed ready-mixed concrete, a separation step of separating sand and gravel from the washing wastewater, a stirring step of equalizing the concentration of the wastewater, and a dewatering of water from the wastewater after the stirring step. And at least one of a step of using the water dewatered in the dewatering step as kneading water for producing ready-mixed concrete in a factory or a step of using it as washing water for washing a mixer truck. This is a closed industrial waste treatment method.

[0017]

According to the invention of the present application, once the cake produced by the dehydrator is solidified by standing or the like, the strength of the cake becomes 8 N or more. The crushed material can be crushed into appropriate fragments without becoming crushed, and the crushed material can be reused as a roadbed material or the like. With it,
Fine sand, sand and gravel separated by the separation device, and water dewatered by the dehydrator are also reused.

Further, the cake produced by the dehydrator is kneaded with the ready-mixed concrete in a kneading machine, and the kneaded material is solidified by standing or the like, and the solidified product is crushed by a crusher to facilitate the crushing. In addition, the crushed material can be reused as a roadbed material or the like.

Further, when the cake produced by the dewatering machine is kneaded with the ready-mixed concrete and the kneading machine, the kneaded material is transported to the solidification place by a transporting means such as a mixer truck, thereby increasing the processing efficiency.

[0020]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 2 is a flow chart of the present invention for eliminating industrial waste by using a crusher and a wastewater treatment device in a ready-mixed concrete factory.

The process of treating the returned ready-mixed concrete as an excess of the mixer truck 1 and the process of treating the washing wastewater of the empty mixer truck are separated. The returned ready-mixed concrete 20 is temporarily left in the soil to be solidified 21. Then, it is crushed by the crusher 23.

The empty mixer truck 1 is washed by the washing device 2, and the washing wastewater is sent to the aggregate classifier 3.
The aggregate classifier 3 is the same as the conventional one, and separates and collects the sand 8 and the gravel 9 by the classifying action, and the separated and collected sand 8 and the gravel 9 are transferred to the BP 11 of the factory. Sent and reused.

The waste water from which the sand 8 and the gravel 9 have been removed from the aggregate classifier 3 is sent to a fine sand recovery machine 4 consisting of a cyclone. The fine sand collecting machine 4 separates and collects the fine sand in the wastewater by centrifugal action, and the separated and collected fine sand is introduced into the aggregate classifier 3 and collected together with the sand separated by the aggregate classifier 3. You.

The waste water from which the fine sand has been separated and removed is sent to a stirring water tank 5 and is stirred substantially uniformly by a stirrer (not shown) to generate substantially uniform sludge water.

The sludge water in the stirring water tank 5 is supplied to a dehydrator 6
To be dehydrated. The dehydrated water is sent to the supernatant water tank 7 and the supernatant water above the supernatant water tank 7 is sent to the B / P 11 of the factory as kneading water or sent as washing water for the washing device 2. Reused.

The sludge water is supplied to the dehydrator 6
Dehydration produces a so-called cake, but this cake still contains a lot of water, and when it is crushed as it is, it becomes ragged and difficult to reuse,
It is possible to leave it in the soil once and solidify it 22. In this case, it may be one day, but if it is left for at most 4 or 5 days,
The strength was 8N, and it was found that if the strength was 8N, the cake did not become ragged when crushed by a crusher, and it was possible to crush the cake into appropriate pieces.

For this purpose, the cake produced by the dehydrator 6 is once left in the soil to solidify 22 to a strength of 8N or more. Next, the solidified cake 22 and the returned ready-mixed concrete 20 together with the solidified 21 are put into a crusher 23 and crushed into appropriate crushed pieces, and the crushed pieces crushed by the crusher 23 are all reused as the roadbed material 24.

With this configuration, the cake can be easily crushed, and the cake can be reused as a roadbed material.

FIG. 3 is another flow chart of the present invention for eliminating industrial waste by using a crusher and a wastewater treatment device in a ready-mixed concrete factory. The thing is the same as that of FIG.

That is, the washing wastewater in the washing device 2 is separated into fine sand and fine sand by the separation device including the aggregate classifier 3 and the fine sand collecting device 4.
The sand and the gravel are separated, the sludge water is made substantially uniform in the stirring water tank 5, and dewatered by the dewatering machine 6.

The solid matter as a so-called cake dehydrated by the dehydrator 6 is sent to a kneader 25 and kneaded with the returned ready-mixed concrete 20 by the kneader 25. In this case, the cake becomes ragged in the kneading machine 25 and is almost uniformly mixed with the returned ready-mixed concrete 20.

The kneaded material kneaded by the kneader 25 is left in the soil and solidified 21. Then, the sufficiently solidified material is put into the crusher 23 and crushed, and the crushed pieces are reused as the roadbed material 24.

With this configuration, the cake can be solidified and crushed together with the returned concrete, and the reuse of the cake as a roadbed material is further improved.

FIG. 4 is still another flow chart of the present invention for eliminating industrial waste by using a crusher and a wastewater treatment apparatus in a ready-mixed concrete factory. Fig. 2
Is the same as

That is, the washing wastewater in the washing device 2 is separated into fine sand and fine sand by the separation device including the aggregate classifier 3 and the fine sand collecting device 4.
The sand and the gravel are separated, the sludge water is made substantially uniform in the stirring water tank 5, and dewatered by the dewatering machine 6.

The solid material as a so-called cake dehydrated by the dehydrator 6 is sent to a kneader 25 and kneaded together with the returned ready-mixed concrete 20 by the kneader 25. In this case, the cake becomes ragged in the kneading machine 25 and is almost uniformly mixed with the returned ready-mixed concrete 20.

Since the kneaded material kneaded by the kneader 25 is in a mud state, it is left in the soil near the kneader 25 to be solidified, and the solidified solid is transported to the crusher 23 to be crushed. Was in the machine 23. However, the solidified material becomes large, and it is difficult to transport the crusher to the crusher when the crusher is located away from the solidification place.

Therefore, the kneaded material kneaded by the kneader 25 is transported to the soil near the crusher 23 by a transportation means, that is, the mixer 1, and left to solidify 21. Then, the sufficiently solidified material is put into the crusher 23 and crushed, and the crushed pieces are reused as the roadbed material 24.

With this configuration, the solidified material generated in 21 can be easily put into the crusher 23 and can be crushed, so that the efficiency of forming the roadbed material is further improved.

The cake formed by the dehydrator is solidified,
Also, the solidification of the returned concrete may be artificial solidification such as lowering the temperature in the room in addition to the natural solidification, and the reuse of the crushed pieces crushed by the crusher is not limited to the roadbed material, For example, any application that can be used, such as a paving stone, may be used. Further, the transporting means may be any means such as a wheelbarrow as long as it can transport the kneaded material.

[0041]

According to the present invention, the cake produced by the dehydrator is solidified once by standing, and the returned raw concrete is put into a crushing machine together with the solidified product solidified by standing, etc., thereby facilitating the crushing. Can be reused as etc.

Further, the cake produced by the dehydrator is kneaded with the ready-mixed concrete by a kneader, and the kneaded material is solidified by standing or the like, and the solidified product is crushed by a crusher, particularly by the dehydrator. Since the cake can be used without worrying about the degree of solidification of the cake, the crushed material can be more useful as a roadbed material or the like.

Further, when the cake produced by the dehydrator is kneaded with the ready-mixed concrete and the kneading machine, the kneaded material is transported to a solidifying place by a transporting means such as a mixer truck, so that the processing efficiency can be sufficiently improved. it can.

As a result, all the sludge can be reused without deteriorating the quality of the new concrete to be produced, so that the generation of industrial waste can be eliminated.

[Brief description of the drawings]

FIG. 1 is a flowchart of a conventional waste treatment apparatus in a ready-mixed concrete factory.

FIG. 2 is a flowchart of a waste treatment device in a ready-mixed concrete factory according to the present invention.

FIG. 3 is a flowchart of another waste treatment apparatus in the ready-mixed concrete factory of the present invention.

FIG. 4 is a flowchart of still another waste treatment apparatus in the ready-mixed concrete factory of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Mixer truck 2 Washing device 3 Aggregate classifier 4 Fine sand recovery machine 5 Stirred water tank 6 Dehydrator 7 Supernatant water tank 8 Sand 9 Gravel 11 BP 20 Returned ready-mixed concrete 21 Solidification 22 Solidification 23 Crusher 24 Recycling base material 25 Kneading machine

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B28C 5/42 B28C 7/00 7/00 B09B 5/00 ZABF

Claims (15)

[Claims] 1. A washing device for washing ready-mixed concrete adhering to a mixer truck, a separating device for separating sand and gravel from washing wastewater discharged from the washing device, and a water content in wastewater discharged from the separating device. And a crusher for crushing a mixture of the solidified product dehydrated and solidified by the dehydrator and the solidified returnable concrete, and the crushed material from the crusher is reused as a roadbed material or the like. A closed type industrial waste treatment apparatus characterized by the following. 2. A washing device for washing ready-mixed concrete adhering to a mixer truck, a separating device for separating sand and gravel from washing wastewater discharged from the washing device, and a water content in wastewater discharged from the separating device. A dewatering machine for dewatering, a kneader for kneading the solids dehydrated by the dewatering machine and the returnable concrete, and a crusher for crushing the solidified kneaded material in the kneader, comprising: A closed-type industrial waste treatment apparatus wherein crushed materials are reused as roadbed materials and the like. 3. The closed-type industrial waste treatment apparatus according to claim 2, wherein the mixture kneaded by the kneading machine is transported to a solidifying place by a transporting means. 4. The closed type industrial waste treatment apparatus according to claim 3, wherein said transportation means is a mixer truck. 5. A supernatant tank for storing water dehydrated by the dehydrator, wherein the supernatant water is used as kneading water for producing ready-mixed concrete at a factory or washing water for washing a mixer truck. 5. The closed industrial waste treatment apparatus according to claim 1, wherein the apparatus is used. 6. The solidified material produced and solidified by the dehydrator has a strength of 8N or more.
6. The closed industrial waste treatment apparatus according to any one of claims 5 to 5. 7. The closed industrial waste treatment apparatus according to claim 1, wherein the solidification is performed by leaving the solidification. 8. The closed industrial waste treatment according to claim 1, wherein the separation device comprises an aggregate classifier for separating sand and gravel and a fine sand recovery machine for separating fine sand. apparatus. 9. The closed type industrial waste treatment apparatus according to claim 1, wherein the fine sand recovery machine is formed of a cyclone. 10. A step of solidifying the returned raw concrete, a step of dehydrating the washed raw concrete, a step of solidifying a solid dehydrated in the dehydrating step, and a step of crushing the solidified substance produced in both the solidifying steps. Recycling the crushed material generated in the crushing step as a roadbed material or the like. 11. A step of dewatering the washed ready-mixed concrete, a step of kneading the solid dehydrated in the dewatering step and the returned ready-mixed concrete, a step of solidifying the kneaded material in the kneading step, and a step of producing the solidified product. A step of crushing solidified material, and a step of reusing the crushed material generated in the crushing step as a roadbed material or the like. 12. A step of dewatering the washed ready-mixed concrete, a step of kneading the solids dehydrated in the dewatering step and the returned ready-mixed concrete, a step of transporting the kneaded material in the kneading step to a solidification place, Solidifying the conveyed kneaded material, crushing the solidified material generated in the solidifying process, and recycling the crushed material generated in the crushing process as a roadbed material or the like. Closed industrial waste treatment method. 13. The closed industrial waste treatment method according to claim 10, wherein the solidification step comprises a step of leaving the solid waste. 14. The washing raw concrete treatment includes a washing step of washing the washed raw concrete, a separation step of separating sand and gravel from the washing wastewater, a stirring step of equalizing the concentration of the wastewater, and a step of dehydrating water from the wastewater after the stirring step. 14. The closed industrial waste treatment method according to claim 10, comprising a dehydration step. 15. The method according to claim 15, wherein at least one of a step of using water dewatered in the dewatering step as kneading water for producing ready-mixed concrete in a factory or a step of using it as washing water for washing a mixer truck is included. The closed industrial waste treatment method according to claim 10, wherein: