JP4247794B2 - Kneading apparatus for waste mud treatment and waste mud treatment method using the same - Google Patents

Description

  The present invention provides a kneading apparatus for waste mud treatment that is suitable for continuously solidifying waste mud containing cement that is difficult to reuse among waste mud generated due to ground improvement and the like, and It relates to a wastewater treatment method using the same. In the present specification, “cement” means a cement-based improving material and is a broad term including a cement-like substance. “Flocculant liquid” means a solution obtained by dissolving a flocculant in water or the like, and is usually composed of a flocculant, an auxiliary agent, and water.

  In the ground improvement method, cement-based improvement material may be supplied along the agitation shaft that penetrates or withdraws into the ground and sprayed into the ground to mix with the in-situ soil to improve the ground strength. In this construction method, a part of the improved material injected into the ground is discharged upward along the stirring shaft to the ground surface along with the soil around the shaft. Since this waste mud contains cement, it is generally carried out as industrial waste without being reused.

  Since the above-mentioned waste mud has a high water content ratio, the capacity increases, and the transportation cost increases accordingly, and the industrial waste treatment cost for the improved construction cost is high. As a countermeasure, if water can be easily dehydrated and separated from the waste mud, not only can the water be reused, but also the residue after dehydration will be reduced. Become. However, there is a filter press as a conventional dehydrator or classifier, but the dehydration and separation method using this device will cause clogging because the cement adheres to the filter, resulting in reduced dehydration capacity and maintenance. The equipment itself is large and requires a large installation place.

On the other hand, in the mud water separation method of Patent Document 1 below, a flocculant and a separating agent are added to the mud water and stirred, and the mud in the mud water is solidified. The mud and water are separated through the muddy water through the drainage section. As a muddy water separator, an introduction part for introducing muddy water in a state in which mud is solidified into a box capable of accommodating muddy water, and a drainage part that allows water to pass and does not allow the mud mass to pass through In addition, a supply means for supplying compressed air to the inside and an air circulation portion that enables air to flow inside and outside the box are provided. Moreover, the said water draining part is provided in the side surface of the box, and drains it using the inclination apparatus which inclines a box so that this side surface approaches downward.
JP 2004-337757 A

  In the method and apparatus of Patent Document 1 described above, muddy water corresponds to the discharged mud of the present invention, but since a mixer truck is used as a means for mixing the discharged mud with the flocculant and the separating agent, Even if appropriate kneading treatment according to the property cannot be expected, and even if the muddy water and waste mud to be treated can be processed into substantially agglomerated aggregates, the properties of the aggregates greatly vary, resulting in a drainage portion. It is difficult to set the mesh of the mesh that constitutes, and the degree of drainage becomes unstable. In the dehydration or classification device, in addition to the fact that the properties of the aggregates are not stable, the aggregates are placed in a box, and the box is tilted so that the water is drained by compressed air or gravity. bad.

  The present invention solves the above problems. Its purpose is to enable solidification of waste mud efficiently and stably, thereby using a kneading apparatus suitable for reducing the volume and volume of waste mud generated at the construction site and using it. The purpose is to provide a wastewater treatment method.

In order to achieve the above object, the invention of claim 1, as specified in the example of the drawings, incorporates waste mud containing cement and kneads a flocculant liquid in a predetermined ratio to the waste mud to obtain a substantially agglomerated aggregate. In the kneading device 25 to be processed, the receiving screw 47, the stirring blade 48 or the stirring screw, and the discharging screw 49 are sequentially mounted from one end side of the shaft to the other end side with respect to the internal rotation shaft 46. The apparatus main body 40, a driving means 50 such as a motor for rotating the rotating shaft 46, and the one end side of the apparatus main body 40 are provided so that the waste mud can be discharged and transferred to the receiving screw side almost quantitatively. A fixed amount supply means 42 and a flocculant liquid inlet 70 for introducing the flocculant liquid into the apparatus main body 40 are provided, and the flocculant liquid inlet 70 receives the inside of the apparatus main body 40 in the receiving manner. For screw, It is divided into a plurality of locations according to the arrangement position of the stirring blade or the screw for stirring and the screw for discharge, and is provided corresponding to the divided location and attached to the supply pipe for supplying the flocculant liquid. It is characterized in that it can be selectively used by switching the valve 71 .

The invention according to claim 2, in claim 1, of the apparatus main body 40, the discharge screw 49 discharge portion 45 are arranged is, that they are forming a plurality of discharge slits in at least its bottom surface It is a feature.
On the other hand, the invention of claim 3 includes a kneading apparatus 25 that takes in the waste mud containing cement and kneads the flocculant liquid in the waste mud at a predetermined ratio to process it into a substantially agglomerated aggregate. An apparatus main body 40 in which a receiving screw 47, a stirring blade 48 or a stirring screw, and a discharging screw 49 are mounted in this order from one end of the shaft to the other end of the shaft with respect to the rotating shaft 46, and the rotating shaft 46 A driving means 50 such as a motor for rotating the motor, a fixed amount supply means 42 provided on one end side of the apparatus main body 40 to allow the discharged mud to be discharged and transferred to the receiving screw side almost quantitatively, and the flocculant liquid And the coagulant liquid injection port 70 for introducing the coagulant into the apparatus main body 40, and the quantitative supply means 42 is rotatable in the housing 60 and the housing 60 whose lower side is connected to the apparatus main body. In And a rotor shaft 61 having a plurality of blades 62 erected radially around the shaft, and the housing 60 forms an inner peripheral wall with an elastic plate 65. It is characterized by having.
In addition, the invention of claim 4 is a kneading device 25 for taking in waste mud containing cement and kneading a flocculant liquid into the waste mud at a predetermined ratio to process it into a substantially agglomerate. Rotating the rotating shaft 46 and the apparatus main body 40 in which a receiving screw 47, a stirring blade 48 or a stirring screw, and a discharging screw 49 are mounted in this order from one end of the shaft toward the other end of the shaft. A driving means 50 such as a motor, a fixed amount supplying means 42 provided on one end side of the apparatus main body 40 to allow the discharged mud to be discharged and transferred to the receiving screw side almost quantitatively, and the flocculant liquid device A coagulant liquid inlet 70 to be introduced into the main body 40 is provided, and the quantitative supply means 42 is rotatably connected to the housing 60 whose lower side is connected to the apparatus main body 40 and the housing 40. Branch A rotor shaft 61 having a plurality of blades 62 erected radially around the shaft, and a shaft side that is provided between the adjacent blades and is close to the outer periphery of the rotor shaft, and an outer side that is further away from it. A partition wall 66, a cleaning hole 67 provided in the partition wall and penetrating through the inside and outside of the partition wall, and an introduction hole 68 provided in the vicinity of the bearing portion of the rotor shaft 61. It is possible to eject from the inside of the partition wall to the outside through the cleaning hole .

On the other hand, the invention of claim 5 includes a kneading step of kneading the flocculant liquid at a predetermined ratio to the waste mud containing cement by the kneading means to process it into a substantially agglomerated aggregate, and the kneading step by the classifying means. In the waste mud processing method which passes through the classification process which isolate | separates a water | moisture content from the processed said aggregate, the said kneading means comprises the kneading apparatus 25 in any one of Claim 1 to 4 , and the said classification means 26 and 27 are arranged below the kneading apparatus, and the agglomerates processed by the kneading apparatus are transferred to the classification means side by a dropping action directly or via a chute or the like.

The classifying means described above accepts the vibration classifying means 26 that separates moisture while applying vibration to the agglomerates, and / or the aggregate or a part of the water separated by the vibration classifying means. It is preferable that the pressure classifying means 27 is configured to separate moisture by pressurization (Claim 6) .

In the invention apparatus according to claims 1 to 4 , in order to transfer the waste mud to be processed to the receiving screw side in the apparatus main body almost quantitatively through the quantitative supply means, the coagulant liquid is suitable for the amount of the mud. By introducing it from the inlet one by one, the mixing variation is suppressed from the initial stage of kneading, and it can be processed into almost uniform agglomerates having a predetermined viscosity with a stirring blade, thereby separating the water from the next agglomerates. It is possible to improve the water removal efficiency and maintain a stable water separation effect. In addition, it has the following effects.
In the invention apparatus of claim 1 , for example, considering the kneading process according to the waste mud properties to be treated and the length of the reaction time, the most suitable location for treating the waste mud into aggregates of predetermined properties. Allow the flocculant liquid to be charged from the inlet.
-In invention apparatus of Claim 2 , the aggregate after a process can be transferred to the next process, ie, the classification process which isolate | separates a water | moisture content from an aggregate by the dropping method from the slit provided in the discharge part bottom face of the apparatus main body.
In the invention device of claim 3 , when a hard foreign matter such as pebbles mixed in the waste to be treated enters between the inner periphery of the housing and the blades constituting the quantitative supply means, the elastic plate However, it is possible to eliminate the biting state with elastic deformation, and to prevent the stop of rotation of the constant supply means and the accompanying motor seizure.
-In the invention device of claim 4 , since the fixed amount supplying means deposits and accumulates sludge on the blades and the like due to continuous operation, the fixed amount supply becomes inaccurate and the mixing ratio with the flocculant liquid also changes. For example, by periodically pumping fluid (gas, water, flocculant liquid, etc.) and ejecting it from the cleaning hole, the deposits can be blown away to prevent failure, simplify maintenance, and maintain quantitative supply. it can.

In the invention method of claim 5, in addition to the advantages of the above-mentioned kneading apparatus, the agglomerates treated in the kneading apparatus as a waste mud treatment operation are transferred to the classification means as the next step by a dropping action, thereby reducing the processing cost. In addition, the apparatus configuration can be simplified.
The invention method of claim 6 is significant in that a specific example of the classifying means is specified. For example, the vibration type and the pressure type are selectively used according to the properties of the aggregates processed by the kneading apparatus, or the continuous processing is performed. In this case, an efficient solidification process can be realized by using a vibration type and a pressure type together.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, preferred embodiments of the invention will be described with reference to the accompanying drawings. In this description, the overall outline, the flocculant liquid, the waste mud treatment equipment and method, and the kneading apparatus will be described in detail in this order.

(Summary) FIG. 1 shows the relationship between the present invention and the ground improvement method. Reference numeral 1 is a cement milk production plant, reference numeral 2 is a mixing and stirring device installed on the surface GL of the improvement target ground, and reference numeral 15 is a sludge treatment. It is a plant (equipment). Here, the stirring and mixing device 2 includes a caterpillar traveling type base machine 3, a tilting vertical guide 4 erected on the tip side of the base machine 3, and a drive head 5 that can be moved up and down along the guide 4. A hollow stirring shaft 6 that is rotatably provided below the drive head 5 and a plurality of stirring blades 7 disposed on the outer periphery of the lower side of the stirring shaft 6 are provided. The cement milk manufacturing plant 1 receives cement supplied from the silo 8 and water generated by the water supply or sludge treatment plant 15 to manufacture cement milk. The produced cement milk is pumped by a pump 9 to a supply pipe in the stirring shaft 6 through a swivel joint 5a provided immediately below the head 5, and is ejected from a lower end side of the stirring shaft 6 or a stirring blade 7. Erupted through the ground. After the injection, it is mixed with the in-situ soil by the stirring blade 7 and formed as an improved pile 10.

  Prior to the above-mentioned creation work, a temporary waste mud storage pit 12 called so-called kettle lifter is created near the surface of the improved position, which communicates with the planned penetration portion of the stirring shaft 6 through a communication groove 11. A sludge treatment plant 15 is installed in the vicinity of the storage pit 12. As a result, in the construction work, as the improved pile 10 is formed, the mud (a mixture of cement-water-soil, which is discharged to the ground surface along the stirring shaft 25 and is proportional to the injection amount from the injection port. Amount) is stored in the storage pit 12 through the communication groove 11. Then, the waste mud temporarily stored in the storage pit 12 is taken into the waste mud treatment plant 15 and subjected to various treatments in the waste mud treatment plant, and after being separated in water, dumped via the belt conveyor 16. It is transferred to a transport vehicle 17 such as a truck, and is transported and discharged by the transport vehicle 17 as industrial waste. That is, the waste mud treatment plant 15 is set to a processing capacity capable of solidifying the waste mud discharged in proportion to the amount of construction by the stirring and mixing device 1 by on-site processing, and is constructed by operating in parallel with the creation work. It also functions as a residual soil treatment.

  Moreover, FIG. 2 has shown typically the structure of the sludge treatment plant. The wastewater treatment plant 15 includes an equipment main body 20, a flocculant liquid production plant 21 for supplying the equipment main body 20 with a flocculant liquid, and a plurality of small submersible pumps 22 (in the drawing). A relay tank 23 connected to the pump 22, a second submersible pump 24 that is in the relay tank 23 and supplies the accumulated mud to the equipment body 20, etc. I have.

  The equipment body 20 has a kneading device 25 for kneading the waste mud and the flocculant liquid supplied from the pump 24 and the flocculant liquid production plant 21 at an appropriate mixing ratio, and a vibration disposed at the lower end of the discharge end of the kneading apparatus 25. For controlling and controlling the type classifier 26, the pressure type classifier 27 arranged at the lower end of the discharge end of the vibration type classifier 26, and these devices, the coagulant liquid production plant 21, and the pumps 22 and 23. And a control panel (control device) 28. The control panel 28 and each of the devices are connected by an electric signal line as exemplified by a broken line.

  Here, the small submersible pump 22 thrown into the storage pit 12 is superior in handling when moving, etc., compared to the case of using a large pump, and the pump suction port has a mesh diameter of φ2 inches. The particle diameter of the second pump 24 is smaller than the diameter of φ3 inch, and at this point, when the mud is sucked, coarse particles such as dust, waste, gravel, and earth lump mixed in the mud are filtered. However, this increases the pipe resistance. Therefore, in this embodiment, as shown in an enlarged view in part of FIG. 2, an air nozzle 22b is inserted into the pipe 22a, and pressurized air from a gas supply means (not shown) is injected into the air nozzle 22b for pneumatic transportation. By doing so, even if the driving capability of the pump 22 is small, the flow resistance is reduced so that continuous transportation to the relay tank 23 is possible.

  In the wastewater treatment plant of FIG. 2, the flocculant and the flocculant used for forming the agglomerate may be a treatment method using a general organic polymer flocculant and an inorganic flocculant. In order to prevent the formed agglomerates from leaking through the gaps in the steel bar, the interval between the steel bars shown in the discharge part 45 of FIG. 9 is set to 3 to 6 mm. It is necessary to form an agglomerate that is stronger and larger than the agglomerate required in the dehydrator.

(Flocculant liquid) The flocculant production plant 21 can produce the following flocculant liquid, although it varies depending on the processing method, but is not necessarily limited to the present flocculant liquid.
(1) One-pack type flocculant production method and treatment method For 100 parts by weight of tap water, at least one inorganic salt of calcium chloride, sodium chloride, and magnesium chloride is in the range of 1 to 5 parts by weight. A mixture of acrylamide / dimethylaminoethyl metallate methyl chloride quaternary salt copolymer and sodium acrylamide acrylate copolymer (Telflock TG; product of Ternite Co., Ltd.) is added in an amount of 0.5 to 2.0 wt. The polymer solution added in the range of parts is made. Then, terflock TG contained in the present polymer aqueous solution is mixed with cement in terms of powder and added so as to have an addition rate of 0.20 to 0.40 w / w% per dry solid content contained in the waste mud, and stirred and mixed. To form aggregates.
(2) Liquid-forming method and processing method of two-pack type flocculant The liquid-working in the flocculant manufacturing plant 21 in the case of processing using the two-pack type flocculant is only a polymer aqueous solution. On the other hand, since the inorganic flocculant to be used is a liquid product, it is added as it is with the kneading device 25 or once diluted with another tank and added with the kneading device 25. The polymer solution is a polyacrylamide hydrolyzate in a solution in which at least one inorganic salt of calcium chloride, sodium chloride, and magnesium chloride is dissolved in a range of 0 to 1.0 parts by weight with respect to 100 parts by weight of tap water. , Sodium acrylamide acrylate copolymer, (Telflock AH, HS-916; manufactured by Ternite Co., Ltd.) Sodium acrylate, polyacrylate powder product or reverse phase emulsion product in the range of 0.5 to 1.5 parts by weight The polymer flocculant contained in the polymer aqueous solution is mixed with cement in powder conversion and added so as to have an addition rate of 0.10 to 0.40 w / w% per dry solid content contained in the sludge. After mixing to form a highly viscous agar-like material, 0.10 to 9.0 parts by weight of polyaluminum chloride and sulfuric acid band solution were added, Combined 拌混, allowed to form agar-like aggregates.
As a specific example, in the case where 100 m ³ / day of waste mud is treated in any of the above-described treatment methods, about 20 m ³ of a flocculant solution is required, and is proportional to the total amount of waste mud to be treated. As a result, the amount of the flocculant liquid used also increases. Generally, the flocculant liquid is manufactured at the factory and brought to the site. However, when the usage amount is large as described above, it is more advantageous in terms of quality and cost to manufacture at the construction site.

  FIG. 3 shows an example of a procedure for producing a coagulant liquid in the coagulant liquid production plant 21. In this production, first, water and an inorganic salt are mixed to form a required amount of an aqueous inorganic salt solution. The stirring time is 10 sec or more. Next, the flocculant is sequentially added and dissolved in the inorganic salt aqueous solution. In this production, for example, if the flocculant is rapidly dissolved, it gels and creates so-called lumps and does not become a uniform flocculant liquid.For example, the flocculant is added little by little to the inorganic salt aqueous solution, It is preferable to increase to the required concentration. After reaching a predetermined concentration, curing is performed while stirring the whole. The curing time is about 2 hours, and after curing the liquid becomes viscous. After curing, the pump is pumped to the equipment main body 20 side through the piping system in conjunction with the sludge treatment work.

(Drainage treatment facility and method) FIGS. 4 and 5 show a specific structure of the facility body 20. The equipment body 20 is on a rectangular solid frame 30 and has the kneading device 25 arranged at the top, and is located at the lower end of the tip and vibrates perpendicular to the longitudinal direction of the kneading device 25. A classifier 26 is disposed, and a pressure classifier 27 is disposed in parallel with the classifier 26 at a lower portion of the discharge end of the classifier 26. Further, the frame 30 is provided with a step 30a used for inspection or the like on one side, and a control panel 28 or the like is arranged in a lower space of the kneading device 25. The above equipment body 20 has a capacity and weight that can be transported by loading it with other equipment on a 10-ton truck, etc., for example. After transporting to the construction site, simple wiring and piping are applied. Designed for immediate operation.

  And in this waste mud treatment operation, when using the above-mentioned one-pack type flocculant, the waste mud to be treated is introduced into the kneading device 25 while adding the coagulated liquid almost quantitatively, and kneaded. It can be processed into almost agglomerated aggregates. On the other hand, when processing using the two-pack type flocculant, the waste mud to be treated is introduced into the kneading device 25 and added to the kneading device 25 while adding the aqueous polymer solution at the same time. By adding an aqueous solution of an inorganic flocculant and mixing, it can be processed into an agar-like aggregate. Thereafter, the agglomerate falls from the discharge unit of the mixing device described later to the lower vibration classifier 26. In the classifier 26, the aggregate received is vibrated to separate a part of the moisture from the aggregate, and the aggregate is transferred from one end side to the other end side of the apparatus in the direction of vibration. It falls into the chute and can be put into the pressure classifier 27 through the chute. In the classifier 27, the aggregate obtained by separating and removing a part of the water by the classifier 26 is received inside, and the aggregate is compressed and forcedly dehydrated by a piston method to form a substantially pellet-like hardened body. The hardened body is pushed out by opening the lid that closes the front opening. The hardened body pushed out is transferred to the transport vehicle 17 side via the belt conveyor 16 described above. The water dehydrated by the classifiers 26 and 27 flows down below the classifiers 26 and 27 and is stored in a water tank (not shown) and then discharged to the outside or the cement milk manufacturing plant. 1 and the water used for the flocculant liquid production plant 21 are recycled. As described above, in the waste mud treatment method of the embodiment, the waste mud to be treated is processed into a pellet-like hardened body, so that both volume and weight are greatly compressed, and volume reduction and weight reduction are achieved. Can be achieved.

  The agglomerates immediately after being kneaded by the kneading apparatus 25 are only loosely solidified by the flocculant liquid and contain a large amount of moisture inside. Therefore, it is necessary to determine the classification operating conditions in the preliminary test. Specifically, for example, in the case of the pressure classifier 27, if a sudden pressure is applied to the agglomerate, the water drainage path is not secured deep inside the solidified body, and as a result Only the body surface is hardened and the inside is easily muddy. For this reason, in this classification, it is preferable to suppress the press speed to 300 cm / min or less in order to ensure moisture separation. In this embodiment, in order to suppress the press speed in this way, tacting with the previous process can be achieved by using two classifiers 27 as shown in the figure. In this case, the distribution to the two classification devices 27 is performed by a guide chute (not shown).

(Kneading device) FIGS. 6 and 9 show details of the kneading device 25 described above. The kneading device 25 is disposed at the device main body 40 forming the kneading chamber, the waste mud receiving hopper 41 erected on one side of the device main body 40, and the base of the hopper 41, and is rotated at every rotation thereof. And a rotary quantitative supply means 42 for discharging a certain amount of waste mud toward the inside of the apparatus main body 40.

  The apparatus main body 40 has a horizontally long casing 43 and a discharge portion 45 connected to the tip end portion of the casing 43 via a partition wall 44, and the rotation shaft 46 is disposed in the casing 43 and the discharge portion 45. It is arranged in a state penetrating back and forth. The rotary shaft 46 projects outward at the front and rear shaft ends and is rotatably supported by the front and rear bearings. In the casing 43, a receiving screw 47 and a plurality of stirring blades 48 are sequentially mounted on the rotating shaft 46, and a discharging screw 49 is mounted in the discharging portion 45. The rotating shaft 46 is rotated via a motor 50 as a driving means, a belt, a pulley, and the like. The discharge portion 45 has a large number of discharge slits at least on its bottom surface. That is, the discharge part 45 has a configuration in which, for example, a large number of U-shaped steel bars are used and the steel bars are arranged and supported at intervals of about 3 to 6 mm. In addition, as the structure which controls discharge | emission amount to the discharge part 45, for example, it can also consider making the said slit width into an adjustment type, or pressurizing partially. Further, the stirring blade 48 may have a configuration of a stirring screw. Mud of waste mud or the like tends to adhere to the stirring blade 48, the screws 47 and 49, and the rotating shaft 46. As countermeasures, for example, a brush for scraping is attached, a blade or a screw is formed with a hole, or a part thereof has a mesh structure.

  Further, as shown in FIGS. 7 and 8, the quantitative supply means 42 is connected to the hopper 41 on the upper side of the passage and is connected to the casing 43 on the lower side of the passage, and is rotatable in the housing 60. And a rotor shaft 61 having a plurality of blades 62 that are supported and erected radially around the shaft. Then, when the rotor shaft 61 is rotated at a predetermined speed by the motor 64, the fixed amount supply means 42 discharges the waste mud sent from the hopper 41 side almost continuously to the screw 47 side in the casing 43. . Then, the waste mud is fed forward by a screw 47 and mixed with a flocculant liquid injected from an appropriate position of the hopper 41 and the casing 43 by a stirring blade 48 to be a substantially agglomerated aggregate as will be described later. Then, it is dropped onto the vibration classifier 26 provided at the lower part of the discharge unit 45 through the discharge slit by the discharge screw 49 on the discharge unit 45 side.

  By the way, foreign matter such as pebbles may be mixed in the discharged mud supplied to the fixed amount supply means 42, which may cause biting or seizing of the motor, and further, the discharged mud may be transferred to the rotor shaft 61. If it is left as it is deposited on the blades 62, the quantitative supply is not maintained and becomes inaccurate. For this reason, regular inspection and maintenance must be performed frequently in the conventional apparatus. In this respect, the embodiment is devised as described below.

  That is, in this embodiment, the peripheral portion of the housing 60 forming the inner peripheral wall excluding the upper and lower openings and the front and rear end portions of the inner passage is constituted by a rubber elastic plate 65. With this structure, even if pebbles or the like are sandwiched between the blades 62 and the elastic plate 65 during rotation, the elastic plate 65 is elastically deformed outward to eliminate the bite and prevent the motor from being seized. it can.

  Further, in this embodiment, as shown in an enlarged view in a part of FIG. 7, the partition 66 is provided between the blades 62 and defines the shaft side near the outer periphery of the rotor shaft 61 and the outer side away from it. A plurality of cleaning holes 67 are formed in each partition wall 66. That is, the partition 66 partitions the space between the blades into the rotor shaft 61 side and the outside. The cleaning hole 67 communicates from the rotor shaft side space portion to the outer space portion. On the other hand, the housing 60 has a pair of end plates 63 that are attached to the front and rear end portions and support the ends of the rotor shaft 61. A fluid introduction screw hole 68 is opened in the vicinity of the bearing hole in the end plate 63, and a hose nipple 69 is connected to the screw hole 68. Thereby, in this structure, for example, a hose for compressed air or washing water is connected to the hose nipple 69 and a fluid such as air or water is pumped to enter between the rotor shaft 61 and the partition wall 66. Then, mud or the like that is ejected from the cleaning hole 67 to the outside of the partition wall 66 and fixed to the blades 62 by the ejection force can be blown off.

  By the way, when using the above kneading apparatus 25, the coagulation method, the type of coagulant, and the timing of adding the coagulant to the waste mud become problems. This is because even under the same kneading conditions, for example, insufficient mixing may occur depending on the components and properties of the discharged mud, or flocking may occur due to overmixing, resulting in original mudification. However, this tendency shows almost the same tendency if the waste mud has the same soil quality. In this regard, for example, an aggregating method using the above-described one-pack type aggregating agent is devised as described below.

  That is, in the coagulation treatment example using the one-pack type coagulant, in this embodiment, as the coagulant liquid injection port (nozzle), in addition to the hopper 41, as shown in FIG. It is divided into three zones, an introduction section where the screw 47 is disposed, a stirring section where the stirring blade 48 is disposed, and a discharge section where the discharge portion 45 is provided, and an inlet 70 for the coagulant liquid corresponding to each zone. In addition, each injection port 70 is switched by a valve 71 provided in the flocculant liquid supply line so that the injection port 70 at the optimum position can be selectively used. Thus, when determining the kneading conditions, for example, the valve 71 of the injection port 70 in the hopper 41 is opened and the other three are closed. Switch to the inlet 70 of the introduction section, if it is determined that this section was also overmixed, by switching to the inlet 70 of the next stirring section, it is possible to know the appropriate addition timing according to the soil, Thereafter, by maintaining the position, the kneading operation can be performed at a stable degree of kneading at all times.

Note that the above embodiments do not limit the present invention. The present invention only needs to include technical elements specified in each claim, and the details can be variously changed as necessary.

It is a schematic explanatory drawing which shows the whole flow of the waste mud treatment method to which this invention is applied. It is the schematic block diagram which modeled the principal part of the said waste mud treatment method. It is a flowchart which shows the manufacture procedure which makes the flocculant liquid used for the said waste mud processing method. It is the top view and front view which show the waste mud treatment equipment applied to the said waste mud treatment method. It is the rear view and left view of the said waste mud treatment equipment. It is the top view which shows the kneading apparatus of the said installation, a rear view, a side sectional view, and a front view. It is a model partial enlarged view which shows the fixed_quantity | feed_rate supply means in the said kneading apparatus. It is a model exploded perspective view of the said fixed supply means. It is a schematic plan view which shows the main-body part of the said kneading apparatus.

Explanation of symbols

15 ... Waste mud treatment plant (waste mud treatment equipment)
20 ... equipment body 25 ... kneading device (means)
26 ... Vibration classifier (means)
27 ... Pressure classifier (means)
DESCRIPTION OF SYMBOLS 40 ... (Kneading | mixing) apparatus main body 41 ... Hopper 42 ... Fixed quantity supply means 46 ... Rotating shaft 47, 49 ... Screw 48 ... Stirring blade 50 ... Motor (drive means)
DESCRIPTION OF SYMBOLS 60 ... Housing 61 ... Rotor shaft 62 ... Blade 65 ... Elastic plate 66 ... Partition 67 ... Cleaning hole 68 ... Screw hole (introduction hole)
70 ... Inlet (nozzle)
71 ... Valve

Claims (6)

In the kneading apparatus that takes in the waste mud containing cement and kneads the flocculant liquid in a predetermined ratio to the waste mud to process it into a substantially agglomerated aggregate,
An apparatus main body in which a receiving screw, a stirring blade or a stirring screw, and a discharging screw are sequentially mounted from one end side of the shaft to the other end side of the internal rotation shaft;
Driving means such as a motor for rotating the rotating shaft;
A fixed amount supply means provided on one end side of the main body of the apparatus to allow the discharged mud to be discharged and transferred to the receiving screw side almost quantitatively;
Together and a flocculant solution for injection port for introducing the flocculant solution in the apparatus main body,
The inlet for the flocculant liquid divides the inside of the apparatus main body into a plurality of locations according to the arrangement positions of the receiving screw, the stirring blade or the stirring screw, and the discharging screw, and corresponds to the divided locations. A kneading apparatus for waste mud treatment, which is provided and can be selectively used by switching a valve attached to a supply pipe for supplying the flocculant liquid .   2. The kneading apparatus for waste mud treatment according to claim 1, wherein a discharge part in which the discharge screw is arranged in the apparatus main body has a plurality of discharge slits formed at least on a bottom surface thereof. In the kneading apparatus that takes in the waste mud containing cement and kneads the flocculant liquid in a predetermined ratio to the waste mud to process it into a substantially agglomerated aggregate,
An apparatus main body in which a receiving screw, a stirring blade or a stirring screw, and a discharging screw are sequentially mounted from one end side of the shaft to the other end side of the internal rotation shaft;
Driving means such as a motor for rotating the rotating shaft;
A fixed amount supply means provided on one end side of the main body of the apparatus to allow the discharged mud to be discharged and transferred to the receiving screw side almost quantitatively;
A flocculant liquid inlet for introducing the flocculant liquid into the apparatus body, and
The metering supply means has a housing whose lower side is connected to the apparatus main body, and a rotor shaft having a plurality of blades that are rotatably supported in the housing and erected radially around the shaft. A kneading apparatus for waste mud treatment, characterized in that the housing forms an inner peripheral wall with an elastic plate. In the kneading apparatus that takes in the waste mud containing cement and kneads the flocculant liquid in a predetermined ratio to the waste mud to process it into a substantially agglomerated aggregate,
An apparatus main body in which a receiving screw, a stirring blade or a stirring screw, and a discharging screw are sequentially mounted from one end side of the shaft to the other end side of the internal rotation shaft;
Driving means such as a motor for rotating the rotating shaft;
A fixed amount supply means provided on one end side of the main body of the apparatus to allow the discharged mud to be discharged and transferred to the receiving screw side almost quantitatively;
A flocculant liquid inlet for introducing the flocculant liquid into the apparatus body, and
The fixed amount supply means includes a housing having a lower side connected to the apparatus main body, a rotor shaft having a plurality of blades that are rotatably supported in the housing and are arranged radially around the shaft, A partition wall provided between adjacent blades that defines a shaft side near the outer periphery of the rotor shaft and an outer side away from the shaft; a cleaning hole provided in the partition wall and penetrating the inside and outside of the partition wall; and the rotor A kneading apparatus for waste mud treatment, characterized in that it has an introduction hole provided in the vicinity of the bearing portion of the shaft, and fluid can be ejected from the inside of the partition wall to the outside through the introduction hole and the cleaning hole. . A kneading step of kneading the flocculant liquid at a predetermined ratio to waste mud containing cement by a kneading means to process it into a substantially agglomerated aggregate, and separating moisture from the aggregate treated in the kneading step by a classification means. In the wastewater treatment method that goes through the classification process,
The kneading means is constituted by the kneading apparatus according to any one of claims 1 to 4 , and the classification means is arranged at a lower stage than the kneading apparatus so that the agglomerates treated by the kneading apparatus are directly Alternatively, the waste mud treatment method is characterized in that it is transferred to the classification means side by a dropping action through a chute or the like. The classifying means receives and pressurizes the vibration classifying means that separates moisture while applying vibration to the aggregate and / or the aggregate or part of the water separated by the vibration classifying means. The waste mud treatment method according to claim 5, comprising a pressure classifying means for separating moisture at the bottom.

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