JP2005052763A - Recycling plant and recycling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a recycling plant and a recycling method which enable powdery waste such as sludge, construction waste soil and incineration ash to be recycled comprehensively by using a simple apparatus at a low cost. <P>SOLUTION: For recycling sludge as an aggregate of fine grain components having viscosity, a continuous charging/continuous discharging type kneading mixer 1 is used which is composed in such a manner that a discharge port 6 is provided on the outer circumferential side wall of a washtub-like receptacle 2 of a rotary pan type kneading mixer performing kneading by horizontally rotating blades 3 for stirring, provided inside the receptacle 2, and from the upper end opening part of the receptacle 2, precipitated sludge precipitated in a sludge storage pool 10, an additive material, or the like, containing the powdery waste, or the like, are continuously charged, and the blades 3 are rotated to manufacture a recycled material. The recycled material is continuously discharged from the discharge port 6 similarly by the rotation of the blades 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to sludge generated from water purification plants that have been individually recycled so far, construction residual soil discharged from construction sites, and coal and incineration ash discharged from thermal power plants, etc. Recycling can be easily and at low cost without using large-scale and high-cost equipment such as thickeners and filter presses that have been commonly used in a single facility. The present invention relates to a recycling plant and a recycling method.

Most of the recycling plants related to the treatment of waste (including construction by-products and industrial waste) that have been seen so far have been developed on the premise of limiting the objects to be recycled.
Today, however, the development of a recycling method for mixing industrial wastes and developing new recycled materials is desired.

The government encourages the development of new recycled materials by combining these wastes in order to reduce the amount of landfill disposal. In addition, the establishment of such a system is now an urgent issue, as it is also related to the problem of landfill sites that are becoming tight nationwide.
In view of sludge treatment and recycling, it has been usual to use a thickener or a filter press.

  However, thickeners and filter presses require a large amount of equipment and an attached device, which requires a large capital investment and maintenance cost. Moreover, it cannot be said that the quality of the recycled material is satisfactory.

  Therefore, an object of the present invention is a recycling plant capable of comprehensively recycling powdery waste such as sludge, construction residue and incinerated ash at a low cost using a simple device. And providing a recycling method.

  In order to achieve the above object, the recycling plant according to claim 1 of the present invention is a bowl-shaped vessel (2) for recycling sludge, which is a collection of viscous fine particles. Continuous charging / discharging, which is configured by providing a discharge port (6) on the outer peripheral side wall of the vessel (2) of the rotary pan-type kneading mixer that performs kneading by horizontally rotating the stirring blade (3) provided in the inside. From the open upper end of the vessel (2) of the mold kneading mixer (1), the sludge precipitated in the mud storage pool (10), the additive material containing powdered waste, etc. are continuously added and the The recycled material is produced by rotating the blade (3), and the recycled material is continuously discharged from the discharge port (6) by the rotation of the blade (3).

  Further, in the recycling method according to claim 2, the agitation blade (3) provided in the bowl-shaped vessel (2) in order to recycle sludge, which is an aggregate of viscous fine particles. ) Of a continuous pan / continuous discharge type kneading mixer (1) constructed by providing a discharge port (6) on the outer peripheral side wall of the above-mentioned device (2) of a rotary pan type kneading mixer for kneading by horizontally rotating From the open top of (2), the sludge settled in the mud storage pool (10), the additive material containing powdered waste, etc. are continuously added, and the recycled material is obtained by rotating the blade (3). The recycled material is manufactured and discharged continuously from the discharge port (6) by the rotation of the blade (3).

  Furthermore, the invention described in claim 3 is based on sludge that is a residue obtained by washing the construction residual soil with water and extracting gravel and sand from the sludge that has been carried in from the outside. It is what is collected.

  The “continuous input / continuous discharge type kneading mixer” mentioned here is a continuous input / continuous discharge type kneading mixer described in the three application specifications previously filed by the present applicant (Japanese Patent Application No. 2001-275184). reference).

  Symbols in parentheses indicate corresponding elements or corresponding matters described in the drawings and embodiments of the invention described later.

  According to the recycling plant according to claim 1 of the present invention, the precipitated sludge is collected in the mud pool, and the precipitated sludge and the powdered waste are simply charged into the continuous discharge / continuous discharge type kneading mixer. Since the recycled material can be manufactured automatically, a large-scale and expensive apparatus such as a conventional thickener and filter press is not required. Therefore, the recycled material can be easily manufactured at low cost.

  Further, according to the recycling method according to claim 2, similarly, the precipitated sludge is collected in the mud pool, and the precipitated sludge and the powdered waste are put into a continuous input / continuous discharge type kneading mixer. Since the recycled material can be automatically manufactured, a thickener and a filter press are not required, and the recycled material can be easily manufactured at a low cost.

  Furthermore, according to invention of Claim 3, sedimentation sludge is extract | collected from the sludge which is the residue which washed the construction residual soil and extracted gravel and gravel, and the sludge carried in from the outside. Therefore, these wastes can be recycled comprehensively.

  With reference to FIG. 1 thru | or FIG. 3, the recycling plant and the recycling method which concern on embodiment of this invention are demonstrated. FIG. 1 is a perspective view showing a continuous input / continuous discharge type kneading mixer used in a recycling plant and a recycling method according to an embodiment of the present invention. FIG. 2 is a perspective view showing a vessel portion of the embodiment shown in FIG. FIG. 3 is a flowchart showing steps of the recycling plant and the recycling method according to the embodiment of the present invention.

A recycling plant and a recycling method according to an embodiment of the present invention are for recycling sludge, which is a collection of viscous fine particles, and a mud storage pool 10 and a continuous input / continuous discharge type A kneading mixer 1 is provided.
The mud storage pool 10 accepts sludge, which is a residue obtained by washing gravel and gravel from construction waste discharged from construction sites and the like, and sludge discharged from water purification plants, etc., and precipitating those sludge (consolidation) It is a device that obtains precipitated sludge by sedimentation).

The continuous input / continuous discharge type kneading mixer 1 is provided with a discharge port 6 on the outer peripheral side wall of the rotary pan type kneading mixer 2 which performs kneading by horizontally rotating a stirring blade 3 provided in a bowl-shaped device 2. Is provided.
And from the open upper end of the device 2 of the continuous input / continuous discharge type kneading mixer 1, the precipitated sludge collected from the mud pool 10 and the powdered waste such as coal ash and incinerated ash discharged from the thermal power plant etc. The recycled material is manufactured by rotating the blade 3 by continuously adding the additive material containing the material. Further, the recycled material is continuously discharged from the discharge port 6 by the rotation of the blade 3.

This continuous input / continuous discharge type kneading mixer 1 has a bowl-shaped vessel 2, and two from a single cylindrical main shaft 4 in the center of the vessel 2 (can be further increased). The arm 5 extends toward the bottom plate of the vessel 2, and a stirring blade 3 is attached to the tip of each arm 5. Each of the two arms 5 is long and short, and rotates in the same direction of the outer and inner directions, and the blades 3 rotate horizontally to knead the material uniformly.
The kneaded material is supplied from the upper part of the vessel 2, and the recycled material is automatically discharged from the discharge port 6. Further, the rod-like member attached to the outer arm 5 is a shaving rod 7 installed to scrape off the material adhering to the inside of the outer wall of the vessel 2. The shaving bar 7 is fixed to the arm 5 via a connecting bar 8.

  According to the recycling plant and the recycling method according to the present embodiment, since a large-scale and expensive device such as a conventional thickener and filter press is not required, sludge and powdered waste can be reduced at a low cost. It can be easily recycled.

Next, referring to FIG. 3, one aspect of a recycling plant and a recycling method according to an embodiment of the present invention will be described. The process of the recycling plant in this embodiment is as follows.
1) Residual soil pretreatment process-> 2) Sludge / soil receiving tank-> 3) Plant input hopper-> 4) Trommel-> 5) Classifier-> 6) Receiving tank-> 7) Mud storage pool 10 (used for both storage, storage and circulation) → 8) Sludge input hopper → 9) Continuous input / continuous discharge type kneading mixer 1 (additional material is supplied separately from silo) → 10) Product yard. For each communication, use a hose, belt conveyor, screw conveyor, or hydraulic excavator.

Each action is as follows.
1) Remaining soil pretreatment This is a process to remove rocks contained in construction surplus soil. This is because 2) If a huge rock is directly put into the sludge / remaining soil receiving tank, it will cause destruction of the tank and damage of each device after the next process. The sieving method is generally performed using a grid-like bar (steel bar) called a chute, but there are other methods such as passing through a screen. The present applicant has selected a method using a screen with emphasis on sifting efficiency.

2) Sludge and residual soil receiving tank This process is provided to adjust the amount of raw materials supplied to the plant.
Sludge discharged from water treatment plants, buildings, dredging sites, etc., and construction soil from which large rocks have been removed by sieving are transported here. 3) In principle, only sludge that has been transported by a vacuum vehicle is unloaded directly to the plant hopper. The reason for this is that when other vehicles perform unloading, the unloading speed of the unloading itself is so fast that there is a concern that an amount exceeding the screening ability of the trommel or classifier will be put in. (However, since the spherical aggregate production process is separated from the previous processes, the production of the spherical aggregate itself is not affected.) In addition, since sludge and residual soil are carried in irregularly, loads that exceed the limits of hopper capacity and the capacity of various sieving devices are thrown in by unloading several units at once. The possibility cannot be denied. Moreover, if the unloading is waited until the raw material in the hopper is reduced, the transport efficiency is significantly impaired. Therefore, it is decided to receive the tank once. It should be noted that the loading is preferably performed with a hydraulic excavator.

The hydraulic excavator is versatile and easy to handle. In the unlikely event of a malfunction, the excavator supply system from rental companies and the like is in place and is very convenient.
In addition, the remaining soil is often in a low moisture content state, but since the raw material is supplied to the next process using flowing water, it is mixed with sludge with high moisture content at this stage to increase fluidity. Is both convenient and efficient.

3) Plant input hopper This is a raw material supply port to the plant, where the previous sludge and residual soil are input. This is a vessel called a “hopper” where the bottom and side walls are in close contact with each other to prevent water leakage. Further, the bottom surface of the hopper has a downward slope toward the trommel in the next process. In addition, water is supplied into the hopper using a shower. This is to prevent the accumulation of residual soil in the hopper and to increase the sorting efficiency by the next trommel. The outlet of the hopper is directly connected to the inlet of the trommel, and no special transport device is used. Transporting to the next process by running water.

4) Trommel The main purpose is to select gravel and smaller particles, and the maximum particle size of reclaimed sand is determined here. Trommel is a type of sieving device, and can be simply described as a cylindrical object composed of a wire mesh. Generally, the cylindrical portion (wire mesh portion) is single or double. In addition, the main body has an inclination angle so that the object to be sorted can be put inside the cylindrical main body, and can be sieved while feeding the material downward using the sliding of the material and the rotational movement of the main body. It has become.

In order to prevent clogging of materials, “wet” using water ((shower)) is common, but if particles of coarse aggregate grade are selected, there are many cases where water is not used (dry type). The wet type is superior in terms of sieving efficiency.
The applicant's plant employs a wet process. This is due to the small particle size to be selected. The water used flows out from the previous process and is supplied by hydration (shower) at this point, but these are supplied from a preliminary water tank attached to the mud pool 10. Trommel and the classifier are placed on a different bench (the top is the top, the classifier is the bottom), and the water allocated here flows out to the classifier as it is. Do not use special pumps or other transport devices. However, if there is no difference in elevation on the plant site, take measures such as pumping up.

  In determining the maximum particle size of the reclaimed sand, the top size is determined by setting the outer net to 8 to 5 mm. 5mm when there is a specified size, such as when the use of recycled sand is a composite material, and the productization rate when using recycled sand for purposes where there is no specified size for pipe laying work In consideration of the above, an 8 mm net with a slightly larger opening is used.

5) Classifier The purpose is to select the sand to be reclaimed sand and the fine particles that make up sludge. A classifier is also a type of sorting device. This is a device that separates gravel with high specific gravity and sand and fine particles with low specific gravity by using water flow. There are two outlets, one with sand and one with turbid water. In the basic specification, each is discharged before and after the main body of the apparatus. The extracted sand is directly used as recycled sand. In addition, the polluted water containing a large amount of fine particles is put into a water receiving tank. A pump is used from the water receiving tank to the next process. In the prior art seen above, a monitoring and measuring device which is a leveling device is used here. The system automatically pumps up when the sludge water level rises.

6) Receiving layer The aquarium is installed to receive polluted water. If the plant land area is large and an appropriate bench (step) can be secured, it is sufficient to bring the 7) pool directly. In the case of the present embodiment, this is provided because of the site, and the polluted water that has been drained is directly pumped and sent to the next process.

7) Mud storage pool 10 (used for both mud storage and water storage)
It has a mechanism to promote precipitation of polluted water sent from the previous process and separate fine fraction (sludge) and supernatant water, store the supernatant water as plant supply water, and send water. In addition, all the water other than the pool that performs sludge consolidation sedimentation circulates, and overflow water enters the reserve tank. This overflow water is sent to various parts of the plant, and the water is sent to various parts of the plant using a pump. The main places where water is used in the plant are the inlet, trommel, and classifier.

  The mud storage pool 10 includes a plurality of tanks (pools). The polluted water discharge port from the previous process is provided in each pool, but only one is open at any given time. In addition, each pool is provided with a partition at a portion where a part of the top is recessed. Depending on the number of water tanks installed, the sludge treatment speed in the next kneading process, the capacity of the hopper, etc., the sludge is transferred to the input hopper with a hydraulic excavator at an appropriate timing, and then moved to the kneading process. And send.

There are no other standards or standards for the properties of sludge to be sent to the next process. However, when it is sludge which shows a too high moisture content, there exists a tendency for the usage-amount of an additional material (valuable material) to increase that much. In addition, since most mud pumps prefer to have higher fluidity, sludge cannot be sent if the water content is extremely low. In the experience by the present applicant, it is just good to transfer the sludge that has been placed for about 1 to 2 nights to the charging hopper through the demolition device.
Injecting water into the pool after the sludge has been transported is done by opening the two partitions in the last pool. In order to avoid a shortage of supply to the reserve tank, water injection into the empty pool should be done somewhat conservatively.

8) Sludge input hopper This is a facility for supplying the sludge compacted in the pre-process mud storage pool 10 (circulation pool) to the sludge kneading mixer (continuous input / continuous discharge type kneading mixer 1) in the next process.
For the reason described above, a hydraulic excavator is also used to supply sludge to the hopper. A pump suitable for transporting sludge is used at the bottom of the hopper. A plurality of hydraulic excavators may be installed in consideration of the work position of the excavator and the reach of the arm. In addition, it seems that the capacity will be arbitrarily determined by the installer. Further, in order to break the compacted portion, it is conceivable to install a mud removal device such as a twin-screw mixer on the top or inside the hopper.

8) 'Additional material storage silo The sludge is not the only material that is added to the continuous input / continuous discharge type kneading mixer 1 in the next step. In addition, RC crushed stone or other powdered waste for reducing the unit water volume may be mixed. In the case of the present applicant, coal ash and quicklime are mainly used. In any case, a silo dedicated to the additive material is required. In addition, supply to the mixer 1 is installed by adding an inverter to a screw conveyor or the like. An inverter is a variable device. As described above, as long as inverter control is possible, other measuring devices (flow rate devices, etc.) for monitoring and measuring are unnecessary.

9) Kneading process For mixing sludge and other materials, the continuous input / continuous discharge type kneading mixer 1 invented by the present applicant and previously applied is used. The feature of the mixer 1 is that a finished product outlet 6 is provided on the side of the mixer body. If various materials are put into the mixer 1 and mixed, products are discharged sequentially from the finished product.

10) Product Yard The finished product discharged from the mixer 1 is placed on a belt conveyor and conveyed to the product yard. There is no special setting, it is a so-called normal yard.

Hereinafter, the features of the present invention will be described in detail with a comparison with a general prior art.
Conventionally, there are several methods for recycling sludge, powdered waste (including incinerated ash, coal ash, etc.) and construction soil. However, most of them are carried out in independent facilities or mechanical devices, and it can be said that there are rare recycling processes (factories) that can recycle all of them in one facility.
Recycling multiple types of waste or construction by-products in one facility is done, but it uses thickeners and filter presses.
For example, the outline of a certain prior art is as follows: construction waste soil and sludge are received in one tank as raw materials for reclaimed materials, put into a plant by a hydraulic excavator, and then subjected to particle size selection by washing with water, gravel and reclaimed sand, It is separated into sludge and recycled sand is commercialized as it is. Sludge is manufactured and sold using a granular aggregate or granulator manufactured and marketed by machine manufacturers. In summary, this technique is similar to the present invention, but there are three critical differences. It is the mechanical equipment and monitoring equipment used in sludge recycling, and the recycled materials produced there.

The differences between the above prior art and the present invention are summarized below.
The first difference relates to the machinery used for sludge treatment (including recycling). This prior art uses two mechanical devices, thickener and filter press, in the sludge recycling process, and this point is greatly different from the present invention.
First of all, to describe each function briefly, Thickener is in the next process by separating fine particles and supernatant water while coagulating and precipitating the polluted water, stabilizing the concentration while coagulating the sludge accumulated at the bottom It is a mechanical device that sends to the filter press. The filter press is a mechanical device for producing a dehydrated cake by putting sludge extracted by a thickener into an accordion-like filter cloth and compressing the sludge. These also play a role of keeping the moisture content of the sludge to be input to the treated soil production apparatus in the next process substantially constant.
In addition, the water tank installed in the previous stage of the thickener (the receiving tank for polluted water discharged from the classifier) is used to secure the supply water in the plant (water used in the receiving hopper, classifier, etc.) in the prior art. And the remaining water from which fine particles have been removed by squeezing with a filter press is used.

  The second is related to the monitoring and measuring device which is an attached device. In this prior art, roughly three monitoring and measuring devices are used. It consists of a flow meter for prescribing the amount of valuable materials used in the treated soil production equipment, a water level meter that shows the level of sludge accumulated in the polluted water receiving tank, and a concentration that automatically supplies flocculant according to the pollutant concentration It is a total. The water level meter and the concentration meter are installed in the water tank that receives the polluted water discharged from the classifier. This tank is responsible for the mud storage function for sending the fine particles contained in the polluted water to the thickener and for securing the clear water with a low pollutant concentration (water storage). This supernatant water is pumped up as it is and supplied to various parts of the plant, and corresponds to what is called “circulated water”.

The third difference is the quality (property) of recycled material. The majority of so-called treated soils are produced by mechanical devices manufactured and marketed by general plant manufacturers, etc., and are characterized by extremely high sensitivity to moisture. The ones that are in production or just after completion become sludge again just by getting wet in the rain. This is not specific to the machinery used in the prior art, and most of the machinery manufactured with paddle mixers and other similar processing soils have similar problems. Yes.
On the other hand, in the present invention, the spherical aggregate produced by the continuous input / continuous discharge type kneading mixer 1 has no such problems.
These matters described above are fundamentally different points of the present invention from the prior art.

  As for the sludge regeneration treatment method, the conventional technology was developed for the purpose of producing granulated treated soil, and in the conventional technology that realizes simultaneous treatment of construction residual soil and sludge. The same applies to the recycled materials produced there. However, due to problems with the properties (quality) of recycled materials, production is often suspended during rainfall. This is the case in most cases where the mechanical equipment is brought into a construction site where sludge is generated or when processing is performed in a stationary plant. These reasons are attributed to the fact that the recycled material made mainly from sludge is easily re-sludged by containing moisture. In that sense, the current situation is that an accurate processing system or machine has not been established. The cause is as follows.

Most of the recycled materials containing treated soils expressed in terms of granular solids and granulation produced by various mechanical devices involved in sludge recycling are semi-solid viscous materials. This is why it is greatly affected by rainfall (moisture) during or immediately after production. These semi-solid recycled products have the property of curing over time and increasing strength. This is due to the reaction of cement or cement-based solidified material, and this is the reason why it is easily affected by moisture during or immediately after production.
The present invention solves these problems by using a continuous input / continuous discharge type kneading mixer 1 and providing a recycled material having a certain level of strength even immediately after production.

Here, the role of the mud storage pool 10 and the continuous input / continuous discharge type kneading mixer 1 in the present invention will be described in detail.
First, the role of the mud pool 10 will be described.
The mud storage pool 10 functions as a receiving tank for the polluted water discharged from the classifier, the water supply function of the plant supply water (function as a circulating pool), and when the sludge is introduced into the kneading mixer 1 in the next process. It also has the function as a necessary sludge moisture content adjustment pool.

The configuration of the mud pool 10 will be briefly described.
The mud storage pool 10 is composed of a plurality of water tanks and a spare water tank that share side walls with adjacent water tanks, and forms a single facility (circulation pool) as a whole. Moreover, the water overflowed from the water tank corresponding to the final tank in the series of circulation processes (the surplus water pushed out by the accumulation of sludge) is transferred to the auxiliary water tank through a side groove installed around the pool. The reserve water tank is equipped with a submersible pump, from which water is supplied to various parts of the plant.

In addition, each aquarium is provided with a recessed portion facing the top of the boundary wall (side wall) between adjacent aquariums and the gutters installed around the entire pool, and can be opened and closed there. A partition plate (having the role of a sluice) is provided to adjust the flow of water (circulation path). Each water tank is provided with a discharge port for polluted water discharged from the classifier so that the polluted water can be discharged (injected) into any tank.
The depth of the aquarium may be set arbitrarily depending on the reach (effective work range) of the heavy machinery to be used, but this depends on the given site area. The same applies to the number of water tanks (number of components). As is well known, in order to increase the efficiency of sedimentation / separation of polluted water, it is better to focus on area rather than depth. The heavy machinery is used when the sludge whose moisture content has been adjusted is transferred to the sludge charging hopper in the next process.

The installation form of the mud storage pool 10 is approximately as follows.
Form a two-row column with three tanks in one row, and prepare a total of six tanks (each tank shares side walls with adjacent tanks). The left side of the two aquariums that are visible in the front is numbered 1), then the columns are 2) and 3) in the vertical direction, and folded back to become numbers 4) and 5). To do. In addition, a suitable water tank for receiving overflow water is provided by selecting an appropriate position (it is more economical for the spare water tank to share a side wall with each water tank). All of these form one facility (the mud pool 10).

Moreover, the concrete usage method of the mud pool 10 is as follows.
It should be noted here that the input corresponding to the mud storage pool 10 is the polluted water discharged from the classification process, and the output corresponding to the output is the supernatant water after the fine particles are settled and separated. That's what it means.

  Describe how to use. First, 1) When the polluted water discharge port of the water tank is opened and there is polluted water poured from the previous process (the receiving tank that receives the polluted water discharged from the classifier), Close all other outlets of the tank. 1) If fine particles (sludge) accumulate in the water tank and the water level rises, close the partition (water gate) between water tanks 1) and 2) and close the 1) dirty water discharge port. Next, the outlet is opened in No. 2) water tank. In the meantime, the water tank No. 1) enters a stationary state after the supply of the polluted water is stopped, and enters a process of waiting for the consolidation of sludge. Similarly, when No. 2) tank is filled with sludge, No. 2) dirty water outlet and No. 2) and No. 3 partitions are closed, and No. 3) dirty water outlet is opened. So that polluted water can be poured. No. 2) enters the process of waiting for the sedimentation of sludge as in the case of No. 1) water tank. When sludge accumulates in the No. 3 water tank, it is desirable that the transfer of the sludge consolidated and settled in the No. 1 water tank (to the next process) is completed and full.

In addition, the water tank corresponding to the final tank of the six circulation tanks (the water tank just before the start of the sludge consolidation sedimentation. Example: 1) 2) Only the partition (sluice) facing the side groove is opened, and the overflow water is allowed to flow into the reserve water tank from here. In addition, the partitions facing the side grooves of the water tanks other than the final tank (3), 4), and 5) the water tank) must be closed. By doing so, the water circulation route is determined, and it becomes possible to satisfy the use as a circulation pool.
The above pattern is repeated sequentially. The supernatant water obtained during consolidation sedimentation is transferred to a circulating water tank using a bucket of a hydraulic excavator and reused.

  There is no other standard for the properties of sludge sent to the next process. However, if the sludge which shows a too high water content state is thrown into the mixer 1, the usage-amount of an additive material (valuable material) will increase according to it. In addition, most of the mud pumps prefer to have higher fluidity, so if the water content is extremely low, the sludge cannot be sent. In this regard, it is known from the applicant's experience that what is left about 1-2 nights is appropriate.

  In the present invention, the mud storage pool 10 is used instead of the thickener or the filter press. However, the biggest reason for using these machines in the prior art is to uniformly adjust the moisture content of the sludge to be input into the recycling machine. It is. Also in the continuous input / continuous discharge type kneading mixer 1 used in the present invention, it is desirable to use the one in which the introduced sludge is in a uniform state or in a state where the moisture content is maintained at substantially the same level. Is similar to this. However, the method in the mud pool 10 is significantly different from the conventional method.

  The method of homogenizing the sludge moisture content in the mud storage pool 10 is a method in which the removal of the supernatant water and the stirring of the sludge during consolidation are performed several times during the consolidation sedimentation. The removal of the supernatant water is nothing more than the discharge of surplus water, but the sludge is agitated after removing it to destroy the impermeable layer caused by consolidation.

  The impervious layer is generated in the sludge consolidation process, and is the one in which the finest particles (particles) are concentrated in a certain layer and one layer is formed. This portion has extremely low water permeability, and when this portion is formed, the upper layer and the lower layer are consolidated by using the boundary as a boundary. The upper layer with the impermeable layer as a boundary has an open space in the air, and the supernatant water can be removed by a machine or a pump, but the lower layer has no open part, so it is separated from the water. It becomes difficult. Eventually, the sludge in the upper layer becomes a load and the consolidation of the lower layer is gradually promoted, but since the consolidation is performed with a heavy weight placed on it, a very hard layer is formed in the lower layer . This makes it difficult to obtain sludge that maintains a nearly uniform water content. In order to prevent this from happening, stirring is performed while removing the supernatant water during compaction. Moreover, by destroying the impermeable layer, consolidation sedimentation is newly promoted, and moisture can be more efficiently removed.

  Although it is supplementary, creating an open surface in sludge using permeable concrete material (eg Polacon) and promoting moisture removal of the sludge efficiently removes the moisture by avoiding the effect of the impermeable layer. Because. Of course, this method is also effective in the mud pool 10, but attention is required because only the periphery of the mud storage pool 10 is low in moisture content and harder than other parts.

  In summary, the consolidation process of sludge can be roughly divided into three types (stages). During the period until the impermeable layer is formed and the period when consolidation begins in the upper layer and lower layer after the formation of the impermeable layer, a difference in sludge density occurs between the upper layer and the lower layer, and the upper layer passes the lower layer. Three periods of compression and consolidation.

Next, a part of application examples regarding the installation and use of the mud pool 10 will be introduced.
The usage method is either one of the water tanks mentioned above, or another 2-3 water tanks for dehydration, and the sludge accumulated at the bottom of the water tank where the supernatant water is circulating is transferred there. Is the method. The transfer work is performed using a hydraulic excavator or the like.
In the water tank dedicated to dehydration, gravel or the like extracted with spherical aggregate or trommel is spread on the bottom surface of the water tank, and vertical (standing) piles are provided at predetermined locations. In addition, gravel and spherical aggregate can be substituted as long as they are spread and can ensure water permeability. However, in order to alleviate the influence of clogging due to sludge settling, it is better to use a material having a small particle size in the lowermost layer and a material having a larger particle size as it goes up sequentially. For vertical piles, when using normal sand piles, only the “capillary phenomenon” is used, and if this is replaced with a drainage material such as polacon, a submersible pump can be installed on the bottom of the tank inside the pile. Therefore, more powerful drainage is possible. These are methods using the so-called “sand pile method” and “sand mat method”. In addition, if this is provided in the circulating water tank, a very large submersible pump is required due to the amount of water injection, which is not economical. Therefore, a water tank for dehydration is provided only for the extracted sludge.

  These methods are used to make it difficult to form the impermeable layer seen earlier, and when this method is used, the water in the lower layer can be drained from the impermeable layer. It is very convenient for equalization. However, when the temperature is high, care should be taken because the surface dries out and if left for a long period of time, it may be in a sludge-containing condition that is not suitable as a kneading material. In addition, it is necessary to pay attention to the timing of scooping up sludge from the circulating water tank. The reason is that it is meaningless to take out what has already been completely consolidated in the circulating water tank. Forced drainage by this method has a very high effect, but dehydration efficiency is so good that it is necessary to always pay attention to the balance with the previous and subsequent processes.

Although the general use example regarding the mud storage pool 10 and its application were demonstrated, the judgment of what kind of form it should be made and the function should be separated is the site where the recycling plant is to be installed. There are many places related to the current situation.
The sludge whose water content has been adjusted is transferred to the next kneading step, and is therefore transferred to the sludge charging hopper. Thereafter, water injection into the water tank that has finished transferring the sludge is performed by opening a partition between the water tank corresponding to the end of the circulation and the water tank. However, in order to prevent the outflow amount (= circulated water amount) to the reserve tank, water injection into the empty tank should be done somewhat conservatively.

Next, the role of the continuous input / continuous discharge type kneading mixer 1 will be described.
The continuous input / continuous discharge type kneading mixer 1 is an invention product previously filed by the present applicant, and is provided with a product discharge port 6 of a commonly used bread mixer on the side surface. The main feature is that it is possible to simultaneously feed sludge and pulverulent materials (including waste) and simultaneously discharge the recycled materials produced there. Further, the recycled material obtained there is a spherical aggregate having a certain level of strength immediately after production, and the spherical aggregate is re-sludged due to the influence of moisture as described above even immediately after production. There is no feature. Furthermore, since the continuous input / continuous discharge type kneading mixer 1 uses the high water content sludge supplied from the mud pool 10 as a kneading target, mechanical pretreatment relating to sludge such as dewatering, drying, and crushing. It is also a feature that there is no need to perform.

  The advantage of using a high water content sludge is that it is possible to increase the mixing efficiency due to its high fluidity. When trying to mix a powdery material with a hard material such as a solid material, it is necessary to crush the solid material, and also apply a considerable load to the stirring mixer. Since sludge with high fluidity is used, these can be mixed easily. This means that the supplied valuable materials can be used efficiently. In the case of the above-described prior art, the dehydrated cake is used as the object to be kneaded, and therefore, a dewatered cake crushing step is provided inside the treated soil production apparatus installed there. At first glance, the act of dismantling the hardened object seems to be meaningless.

In addition, it has been found that, in the trial production so far performed by the present applicant using the sludge that has been subjected to consolidation sedimentation in the mud storage pool 10, one having a water content of about 45 to 50% is used on average. .
Sludge has a significant difference in properties depending on the substances (components) that make it up. Even if they show the same moisture content, some of them are okara-like and some are fresh. In particular, sludge discharged from various factories has a variety of components, so it is useless to specify its properties by moisture content. Incidentally, the sludge used in the present invention uses inorganic sludge obtained from a sand factory.

  The continuous input / continuous discharge type kneading mixer 1 according to the present invention can produce a recycled material having a nearly uniform shape even when the moisture content of the supplied sludge changes to some extent as compared with a conventional kneading apparatus. This is because a portion of the convex portion that has been scraped off during the process of forming the spherical aggregate, that is, a so-called surplus additive or the like remains on the bottom surface of the mixer. This is the most advantageous point of using the continuous input / continuous discharge type kneading mixer 1. In addition, the method of “monitoring the amount of sludge charged into the kneading apparatus by its weight and adjusting the amount of additive supply according to the weight” found in the prior art is unnecessary if this mixer 1 is used. In the case of using the mixer 1, it is only necessary to adjust the supply speed of each material at the start of business (to balance the supply speed of each material) (of course, a normal inspection for operating the plant is necessary). ). This is possible because of the structure of the mixer body and the principle of spherical aggregate, and the moisture content of the sludge to be added.

As described in the previous application, the spherical aggregate is rotating and rotating around the central shaft in the mixer 1. The principle of the spherical aggregate described in that occasion is briefly described as follows.
First, it should be noted that the principle of forming the spherical aggregate is the same as the principle of manufacturing the dumpling. Various materials including sludge are affected by the unit water volume specified by the blending (the basic blend is already described in Japanese Patent Application No. 2000-250733 “Sludge Recycling Method”), and immediately after the mixer is charged, In the process (revolution, rotation), the distorted convex part is scraped by other spherical aggregates, and the concave part is spheroidized while new materials (sludge and powdery additive material) are attached. . What has been scraped off during the spheroidization process will stay on the bottom of the mixer or will adhere to other aggregates with recesses, etc. It is rarely discharged from the mixer in a state. This is because the outlet 6 of the mixer is at a position higher than the bottom surface. This is one secret that makes it possible to produce a uniform spherical aggregate without using a monitoring and measuring device. Even if there is a change in the state of the sludge, there is no immediate adverse effect on the recycled material that is discharged as long as there is an excess of solidified material or the like remaining on the bottom of the mixer. On the other hand, since there is no surplus in conventional mechanical devices, if the state of sludge changes, the product is immediately adversely affected, so regular monitoring is required.

  In the continuous input / continuous discharge type kneading mixer 1 used in the present invention, even if there is a slight excess or deficiency in the supply amount of the solidifying material, etc. It has little effect (in the first place, the moisture content of the sludge is adjusted in advance, so experiencing such problems is due to machine troubles, etc.). On the other hand, many of the mixing treatment apparatuses that have been seen so far are discharged to the discharge line (belt conveyor or the like) as they are after passing through the stirring device portion, so that materials (valuable materials such as additives) are wasted. If it runs short, it will have an immediate effect on the product. This also causes unevenness in product quality. In fact, as with the present invention, in a machine device (such as Odyclean) that achieves a continuous system without providing a monitoring and measuring device, the solidified material supply amount is constant. In many cases, the amount of sludge increases slightly, and incomplete recycled products like mud dumplings are discharged. If the composition is distorted, it will be affected. In order to prevent this, there is no choice but to constantly supply a somewhat larger amount of solidifying material or to provide a monitoring and measuring device. In the case of the former, a very high material cost will be charged, and the monitoring and measuring apparatus requires a large installation cost and maintenance cost. Both are uneconomical.

On the other hand, with the continuous input / continuous discharge type kneading mixer 1, it is possible to manufacture a very beautiful recycled material that has never been seen with a minimum amount of solidified material input. In addition, since there is always a surplus, the period until all of the recycled material that is discharged is adversely affected is long, and there is no need to make adjustments in a hurry.
In addition, the case where the quality of the product is judged to be bad is a case where there is a slight difference depending on the individual sludge, but it does not form a sphere, or the feeling that the distortion is increased. Further, even when the intended particle size is not discharged, it corresponds to a problem at the time of manufacture. In this case, correction can be easily made by responding to whether water supply or sludge supply amount is reduced. Since spherical aggregates are spherical, the strength immediately after production is guaranteed, and it is not easy to give the other shapes the strength immediately after production, so it is necessary to pay attention to the shape.

By the way, in the continuous input / continuous discharge type kneading mixer 1, the influence on the spherical aggregate when the additive supply amount is not appropriate will be described.
First, the case where the amount of additive material used is excessive will be described.
In this case, a large amount of fine particles tends to be discharged. However, it does not maintain the shape at the time of charging, but is a fine but spheroidized fine aggregate. Therefore, when it is used as a raw material for RM-30, such a supply balance supplements the fine particles and has a positive effect on the final product. In addition, when it manufactures aiming at the use as a coarse aggregate, if it adds and manufactures a water | moisture content (sludge), it is possible to obtain such an aggregate.

Next, the case where the additive material is too small will be described.
In this case, the aggregate having a rough surface is discharged. If it is too small, sludge close to that at the time of charging may be discharged as it is, so care must be taken, but if the moisture content of the sludge is adjusted to some extent in the previous process, It ’s never going to happen. Although it described also in the place of the previous mud pool 10, it pays attention to formation of a water-impermeable layer, and even if it is formed, it will be supplied to the mixer 1 if it is introduced and supplied to some extent. The moisture content of sludge does not change significantly.

  Here, the sludge supplied to the mixer 1 and its conveying method will be described. There is a hopper for sending sludge to the mixer 1 in the next process near the mud storage pool 10, and the sludge is introduced here using a hydraulic excavator and sent to the mixer 1. The shape of the hopper is a cone shape such as a cone or a quadrangular pyramid shape, and has a shape with few portions corresponding to so-called dead. Also, a mud pump is provided at the lower part of the hopper, and the formation of an impermeable layer in the hopper is prevented by extracting the sludge from the bottom of the hopper. Therefore, if the water content of the sludge put in the hopper is adjusted in advance, the sludge adjusted at a certain water content is supplied to the mixer 1 as it is. However, if the mud pump becomes stationary, it will be consolidated and settled there.

  The production of spherical aggregate will be described. In the experience of the present applicant, the determination of the supply speed of each material including sludge was found and determinable in about 15 minutes after the first input on the manufacturing day started. After that, if the timely monitoring is performed during regular inspections, almost uniform spherical aggregate can be obtained as long as there is no sludge newly added to the sludge charging hopper (in the case of the present applicant, the mixer 1 A sludge hopper is provided that can store the amount of sludge necessary for one production day according to the kneading capacity, so that no new sludge is supplied to the hopper during one production day). In other words, considering the moisture content of the sludge on that day, and confirming and setting the supply speed of each additive, it is possible to produce almost the same product as the regenerated material for the day. The supply speed of sludge, additive material, etc. may be performed by a variable speed device called an inverter in each control panel, and a monitoring and measuring device is unnecessary.

  In this way, by using the mud storage pool 10 and the continuous input / continuous discharge type kneading mixer 1 together, an “accurate treatment system using the same facility for a plurality of wastes including sludge” has been considered as a problem so far. It is possible to solve the problem of “unestablished” and “expensive plant facilities that require thickeners and filter presses (including other associated equipment)”. These problems are caused by the lack of effective regeneration treatment technology for sludge.

It is a perspective view which shows the continuous input and continuous discharge type | mold kneading mixer used in the recycling plant and the recycling method which concern on embodiment of this invention. It is a perspective view which shows the container part of embodiment shown in FIG. It is a flowchart which shows the one aspect | mode of the recycling plant and recycling method which concern on embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Continuous input and continuous discharge type kneading mixer 2 units 3 blades 4 spindle 5 arm 6 discharge port 7 shaving bar 8 connecting bar 10 mud pool

Claims (3)

  In order to recycle sludge, which is a collection of viscous fine particles, the outer periphery of the rotary pan-type kneading mixer that performs kneading by horizontally rotating a stirring blade provided in a bowl-shaped vessel From the upper end open part of the continuous input / continuous discharge type kneading mixer configured with a discharge port on the side wall, the precipitated sludge precipitated in the mud pool and the additive material including powdered waste are continuously added. A recycling plant, wherein a recycled material is produced by rotating the blades and the recycled material is continuously discharged from the discharge port by rotating the blades.   In order to recycle sludge, which is a collection of viscous fine particles, the outer periphery of the rotary pan-type kneading mixer that performs kneading by horizontally rotating a stirring blade provided in a bowl-shaped vessel From the upper end open part of the continuous input / continuous discharge type kneading mixer configured with a discharge port on the side wall, the precipitated sludge precipitated in the mud pool and the additive material including powdered waste are continuously added. And recycling the blades to produce recycled material, and the recycled material is continuously discharged from the outlet through the rotation of the blades.   The reclaimed sludge according to claim 1, wherein the precipitated sludge is collected from sludge that is a residue obtained by washing construction residual soil with water and extracting gravel and sand, and sludge that has been introduced from the outside. A recycling plant according to claim 2 or a recycling plant.

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