JP2007007549A - Method and apparatus for producing coagulant liquid for sludge treatment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable a mass production of a coagulant liquid for sludge treatment with a relatively simple producing apparatus especially in a construction site while satisfying its proper properties and homogenation. <P>SOLUTION: The production method of a coagulant liquid capable of converting sludge into almost agar-like aggregate performs an assistant liquid preparing process for preparing a prescribed amount of assistant liquid by mixing an assistant with water, a coagulant mixing process for supplying a part of the assistant liquid prepared in the above process to a mixer chamber, and supplying coagulant powder by a proper amount to the mixer chamber to mix it with and dissolve it in the assistant liquid, a concentration adjusting process for discharging the mixture solution prepared in the above process to the outside of the mixer chamber to be mixed with the remainder of the assistant liquid, then supplying a part of the mixed solution again to the mixer chamber, and repeating the mixing and dissolving process in the same manner as the coagulant mixing process to prepare a coagulant liquid whose concentration is increased to the prescribed value, and a curing process for curing the coagulant liquid prepared in the above process until it reaches required viscosity while agitating the liquid. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a method for producing a flocculant liquid for waste mud treatment that is used when continuously solidifying waste mud containing cement that is difficult to reuse among waste mud generated by ground improvement and the like. And a manufacturing apparatus. In addition, in this specification, "powder" means not only powdery form but broad meaning including granular form.

  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 such waste mud has a high water content ratio, its capacity is increased, and transportation costs are increased correspondingly, resulting in higher industrial waste treatment costs for improved construction costs. 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.

The following Patent Document 1 discloses a method and apparatus for dewatering or classifying waste mud as described above. First, mud water is introduced into a tank with a stirring function such as a mixer car and a flocculant (strong anion) is used as a medicine. And the like, and a separating agent (basic polyinorganic salt, etc.) are added and stirred to treat the mud in the mud into a mass. Thereafter, the treated material (hereinafter referred to as agglomerate) is passed through a water draining portion on the device side through which water passes without passing through the mud that has become agglomerated, thereby separating mud and water. In addition, here, as an operation procedure, the flocculant is first added to the muddy water, then the separating agent is added and stirred, and the flocculant is separated by 0.1 to 0.2% by weight with respect to the muddy water. It is described that the agent is added in a proportion of 0.2 to 0.8% by weight.
JP 2004-337757 A (paragraphs 0016 to 0018)

  In the above-described waste mud treatment, as described in Patent Document 1, after adding the flocculant powder to the muddy water (corresponding to the waste mud of the present invention), the flocculant powder is added even if the separating agent is added and mixed and stirred. However, due to poor solubility, a large amount of muddy water cannot be processed into uniform aggregates. For this reason, the manufacturer currently purchases and uses a flocculant liquid in which the flocculant powder is adjusted to an aqueous solution, but if a large amount is required, purchase the raw material and use it at or near the construction site where it is used. Dispensing is advantageous in terms of quality and economy. Note that an aqueous solution of an anionic polymer flocculant, that is, a flocculant liquid is preferred as the agent for treating mud.

  However, in the production of the above flocculant liquid, an auxiliary liquid such as calcium chloride is dissolved in water in the mixer chamber to form an auxiliary liquid, and then the flocculant powder is mixed into the mixer chamber while stirring the auxiliary liquid. It is necessary to gradually dissolve in the auxiliary liquid, but for example, if the flocculant powder is dissolved at once, a partial gelation phenomenon occurs and cannot be created as a uniform flocculant liquid. The problem of proper properties and homogenization cannot be solved even if the stirring time is increased. Therefore, the object of the present invention is to solve the above-mentioned problems and satisfy the proper properties and homogenization of the flocculant liquid for wastewater treatment while using a relatively simple manufacturing apparatus, particularly at the construction site. While making mass production possible.

  In order to achieve the above object, the invention of claim 1 is composed of a flocculant, an auxiliary agent and water, and is added to and mixed with the waste mud to be treated at a predetermined ratio so that the waste mud is substantially agglomerated. In the method for producing a flocculant liquid that can be processed into a product, an auxiliary liquid preparation step of mixing the auxiliary agent and water to produce a predetermined amount of auxiliary liquid, and an auxiliary agent produced in the auxiliary liquid preparation step A flocculant mixing step of supplying a part of the liquid to the mixer chamber, supplying an appropriate amount of the flocculant powder to the mixer chamber and mixing and dissolving in the auxiliary liquid, and a mixed solution made by the flocculant mixing step Is discharged to the outside of the mixer chamber and mixed with the remainder of the auxiliary liquid, and then a part of the mixed solution is supplied again to the mixer chamber and the mixing and dissolving operation similar to the flocculant mixing step is repeated in order. Concentration adjustment process to create a flocculant liquid that has been increased to a predetermined concentration It is characterized by undergoing a curing step of curing the flocculant solution made of the concentration adjusting process to the required viscosity with stirring.

  In the above production method, in the flocculant mixing step, a part of the auxiliary liquid produced in the auxiliary liquid preparation step is supplied into the mixer chamber while generating a cyclone flow on the supply port side of the mixer chamber, And supplying the flocculant powder to the cyclone flow in an appropriate amount (Claim 2), in the auxiliary liquid preparation step, the auxiliary liquid is prepared by supplying the water and auxiliary agent to the mixer chamber, First, the water is discharged to the outside of the mixer chamber (Claim 3), the water is supplied into the mixer chamber while generating a cyclone flow on the supply port side of the mixer chamber, and an appropriate amount of the auxiliary agent is supplied to the cyclone flow. (Claim 4) is preferable.

  On the other hand, the invention device according to claim 5 is used in the manufacturing method according to any one of claims 1 to 4, and is provided below the mixer chamber, the supply port provided above the mixer chamber, and the mixer chamber. A horizontal mixer having a discharge port provided on the side, a stirring tank having a supply port provided on the upper side and a discharge port provided on the lower side, and an assistant for supplying the auxiliary agent to the supply port of the mixer Agent supplying means, coagulant supplying means for supplying the flocculant powder, water supplying means for supplying water, a first liquid tank and a first liquid tank in which a mixed solution made in the mixer chamber is introduced from a mixer discharge port A first transfer means for sending the mixed solution to the supply port of the stirring tank; a second liquid tank for feeding the mixed solution stirred in the stirring tank from the tank discharge port; and the mixed solution in the second liquid tank Second transfer to the mixer supply port It is characterized in that it comprises a means.

  In the above manufacturing apparatus, the mixer has two positions apart from the supply port, and supplies water from the water supply unit to one supply port or supplies auxiliary agent from the auxiliary agent supply unit, The mixed solution in the second liquid tank is supplied from the second transfer means to the other supply port or the flocculant powder is supplied from the flocculant supply means (Claim 6), and the supply port is substantially cylindrical. In addition, the water supply means and the second transfer means can form a cyclone flow by injecting water or a mixed solution in the cylindrical inner peripheral direction of the supply port (Claim 7). ) Is preferred.

-In the method of the invention of claim 1, it is possible to manufacture while adjusting the concentration of the flocculant liquid during the manufacturing process in order to adjust to the target concentration, especially at the construction site. In order to increase the concentration of the solution sequentially, for example, it is possible to produce a large-capacity flocculant solution while preventing proper gelation and adhesion and maintaining proper properties and uniformity.
In the invention method of claim 2, since the auxiliary liquid and the flocculant liquid are mixed and stirred from the initial stage of mixing through the cyclone flow, the working time can be shortened while maintaining the degree of stirring in the flocculant mixing process.
In the method of the invention of claim 3, the same mixer chamber can be used for both the auxiliary liquid preparation step and the flocculant mixing step.
-In the invention method of Claim 4, since auxiliary agent and water are mixed and stirred from the initial stage of mixing through a cyclone flow, the working time can be shortened while maintaining the degree of stirring in the auxiliary liquid preparation step.
In the invention apparatus of claim 5, the mixer, the stirring tank, the auxiliary agent supply means, the flocculant supply means, the water supply means, the first liquid tank and the first transfer means, the second liquid tank and the second transfer Therefore, the manufacturing method according to claims 1 to 4 can be carried out using only general-purpose devices and equipment.
In the invention apparatus according to claims 6 and 7, for example, the mixer has two supply ports, and each supply port has a cylindrical shape, so that water or a mixed solution can be jetted and easily supplied as a cyclone flow. It can be so.

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

(Summary) Fig. 1 shows the relationship between the ground improvement method and the waste mud treatment. 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 waste mud 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 storage pit 12 called so-called pot-lifting is created near the ground surface portion, which communicates with a planned penetration portion of the stirring shaft 6 through a communication groove 11. A wastewater treatment plant 15 is installed. In the construction work, as the improved pile 10 is created, waste mud (a mixture of cement-water-soil, which is proportional to the injection amount from the injection port) discharged to the ground surface along the stirring shaft 25 is discharged. It 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.

  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 handleability compared with the case where a large pump is used, and the pump suction port has a mesh diameter of φ2 inches. Coarse particle components such as dust, glass, gravel, and dirt mixed in the mud are filtered when the mud is sucked by this, as compared with the mesh diameter φ3 inch of the pump 24. 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. As a result, even if the driving capability of the pump 22 is small, the flow resistance is reduced so that continuous transport to the relay tank 23 is possible.

(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.

(Manufacturing apparatus) FIG. 4 shows a manufacturing plant (apparatus) suitable for carrying out the manufacturing method of the present invention based on the manufacturing procedure of FIG. That is, the manufacturing plant 21 in the figure includes a water tank 30 serving as a water source, a temporary storage liquid tank 31, a horizontal mixer 32 having substantially cylindrical supply ports 32a and 32b on both upper sides, and an upper left and right side of the mixer 32. The auxiliary agent supplying means 33 and the flocculant supplying means 34 arranged in the above, and the stirring tank 35 arranged on one side of the mixer 32 are provided.

  The water tank 30 can introduce the water in the tank into the one supply port 32a of the mixer 32 at a predetermined flow rate via a pump 50, a pipe 53, a flow valve provided in the middle of the pipe, and the like. The liquid tank 31 is divided into a first liquid tank 37 located directly below the mixer 32 by a partition wall 36 and a second liquid tank 38 located on the lower side of the stirring tank 35. The first liquid tank 37 is provided in a discharge section to be described later and receives and stores the liquid in the mixer 32 via valves 42 and 43, and agitate the liquid stored in the tank via the pump 51, the pipe 54, and the like. It can be transferred to the upper inlet of the tank 35. The second liquid tank 38 receives and stores the liquid in the agitation tank 35 via the lower outlet and the valve 46 provided at the outlet, and stores the liquid stored in the tank via the pump 52, the pipe 55, and the like. Thus, it can be transferred to the other supply port 32 b of the mixer 32.

  The mixer 32 is provided in a state of being pivotally supported on both sides of the mixer chamber, and has a rotating shaft 40 in which a plurality of stirring blades 39 are mounted at substantially equal intervals. The rotary shaft 40 can be rotated at an arbitrary speed via a drive motor and a speed reduction mechanism (not shown). On the lower side of the mixer 32, there are provided a discharge portion and valves 42 and 43 provided in the discharge portion. Further, the connecting portion between the supply port 32a and the pipe 53, and the connecting portion between the supply port 32b and the pipe 55 are shown in cross section in the upper part of FIG. When water or a liquid is discharged in the supply ports 32a and 32b, it is introduced into the mixer 32 while generating a spiral cyclone flow. That is, in this configuration, the auxiliary agent is mixed from the supply means 33 while supplying water in the cyclone flow, or the coagulant powder is supplied from the supply means 34 while supplying the mixed solution (auxiliary liquid and flocculant) in the cyclone flow. By mixing, the degree of mixing is increased from the initial stage.

  The stirring tank 35 is a vertical type and has a rotating shaft 45 with a plurality of stirring blades 44 mounted thereon. The rotation shaft 45 is arranged in the center vertical direction, and is rotatable in connection with the motor M provided at the upper portion. A discharge part and a valve 46 are provided on one lower side part corresponding to the second liquid tank 38. A compressor 48 is connected to the lower end via a flow control system. The compressor 48 sends compressed air into the tank for initial air agitation, and is also used, for example, when the tank capacity is low.

(Manufacturing method) Next, the manufacturing procedure of the flocculant liquid using the manufacturing plant 21 will be described. In this production method, an auxiliary liquid preparation step for mixing an auxiliary agent (auxiliary particles or auxiliary powder) and water to produce a predetermined amount of auxiliary liquid, and a part of the auxiliary liquid in the mixer 32. At the same time as supplying, an appropriate amount of flocculant powder is supplied into the mixer 32 and mixed and dissolved in the auxiliary liquid, and the mixed solution in the mixer 32 is discharged out of the mixer 32 and the remainder of the auxiliary liquid is discharged. Then, a part of the mixed solution is supplied again to the mixer 32, and at the same time, a concentration adjusting step for producing a flocculant liquid that has been increased to a predetermined concentration by sequentially repeating the mixing and dissolving operation similar to the flocculant mixing step, And a curing step of curing the flocculant solution to a required viscosity while stirring.

  More specifically, in the auxiliary liquid preparation step, the valves 42 and 43 of the mixer 32 are closed and the pump 50 is driven to flow water to the supply port 32a while driving the supply means 33 to drive the water flow. The auxiliary agent (calcium chloride, powder or particles) is sequentially dropped to the vortex center position of the supply port 32a at a supply amount according to the above. As a result, the auxiliary agent is forcibly mixed with water by the cyclone flow and then further uniformly mixed by the stirring blade 39 in the mixer 32. This operation is performed until the total amount of the designed auxiliary liquid is reached. Further, the valve 42 opposite to the supply port 32a is opened, the auxiliary solution prepared from the tank chamber is once discharged into the first liquid tank 37, and the auxiliary liquid stored in the first liquid tank 37 is pumped. By 51, it is transferred into the stirring tank 35. In the stirring tank 35, the rotating shaft 45 is rotated, and the dissolving operation (dissolving of the auxiliary in water) is continuously performed on the stored auxiliary liquid.

  After the preparation of the auxiliary liquid, the flocculant mixing step and the concentration adjusting step are continuously performed. That is, in this step, the discharge side valves 42 and 43 of the mixer 32 are closed, and the valve 46 of the stirring tank 35 is opened to transfer a part of the auxiliary liquid to the second liquid tank 38. While the auxiliary liquid is caused to flow into the mixer 32 through the pipe 55 and the supply port 32b by the pump 52, the supply means 34 is driven to drop and supply the flocculant powder to the vortex center position. Thereby, the flocculant is forcibly mixed with the auxiliary liquid by the cyclone flow, and then further uniformly mixed by the rotation of the stirring blade 39 in the mixer 32. In addition, since the flocculant powder is difficult to dissolve as described above, for example, it is necessary to set the flow rate of the cyclone flow fast and the supply amount per time small. Therefore, in the concentration adjustment process, the concentration of the liquid for each operation of the mixer 32 is thin, but after the liquid is formed, the valve 43 on the side opposite to the supply port 32b is opened and discharged into the first liquid tank 37 and immediately pumped. It returns to the stirring tank 35 through 51, and it stirs and mixes with the remainder auxiliary agent liquid, It is made to approach the target density | concentration sequentially for every operation | work.

  When the above stirring and mixing operation is repeated and a predetermined concentration is reached, a curing step is performed. In this step, the entire flocculant liquid prepared is operated to be transferred into the stirring tank 35, and the flocculant liquid is further stirred and cured in the stirring tank 35 for about 2 hours. The flocculant liquid produced during the stirring and curing is reacted to increase the viscosity and can be used as a flocculant liquid for wastewater treatment. After that, for example, if the valve 46 of the agitation tank 35 is connected to a storage tank (not shown) and transferred to the storage tank, one liquid preparation operation is completed, and the auxiliary liquid preparation is performed again. Repeat the flocculant solution until the daily dose is reached. Moreover, the prepared flocculant liquid is supplied to the above-mentioned kneading apparatus 25 side. In such a production plant, the same mixer 32 can be shared for the production of the auxiliary liquid, and there is an advantage that the production apparatus or equipment can be downsized.

(Drainage treatment facility and treatment method) FIGS. 5 and 6 show an example of a wastewater treatment plant (equipment) 15 that uses the flocculant liquid prepared as described above. This equipment main body 20 is on a rectangular solid frame 60, and the above-described kneading device 25 is disposed 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 60 is provided with a staircase 60a used for inspection and the like on one side, and a control panel 28 and the like are arranged in a lower space of the kneading device 25.

  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 guide chute and can be put into the pressure classifier 27 through the guide 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 thus extruded is transferred to a transporting vehicle or the like via the belt conveyor 16 of FIG. 2 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 water in the flocculant liquid production plant 21, that is, sent to the water tank 30 in FIG. 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 the volume and weight are greatly compressed, and volume reduction and weight reduction are achieved. Can be achieved.

  Note that the above embodiments do not limit the present invention. The present invention may be provided with the technical elements specified in claims 1 and 5, and the details can be variously changed as necessary.

It is explanatory drawing which shows the whole flow of the sludge treatment method performed at a construction site. It is explanatory drawing which shows the relationship between the said sludge disposal method and a flocculant liquid. It is a flowchart which shows the manufacture procedure which makes the said flocculant liquid. It is the block diagram which shows the manufacturing apparatus of the said flocculant liquid typically, and the sectional view on the AA line. 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.

Explanation of symbols

20 ... equipment body 21 ... flocculant liquid production plant (equipment)
25. Kneading apparatus (means)
26 ... Vibration classifier (means)
27 ... Pressure classifier (means)
30 ... Water tank 31 ... Liquid tank (37 is the first liquid tank, 38 is the second liquid tank)
32 ... Mixer (32a and 32b are supply ports, and 42 and 43 are discharge valves)
33 ... Auxiliary supply means 34 ... Flocculant supply means 35 ... Stirring tank (46 is a valve of the discharge section)

Claims (7)

In the method for producing a flocculant liquid, which comprises a flocculant, an auxiliary agent, and water, and is added and mixed to the waste mud to be treated at a predetermined ratio, so that the waste mud can be processed into a substantially agglomerated flocculant
An auxiliary liquid preparation step of mixing the auxiliary agent and water to make an auxiliary liquid of a predetermined amount;
A part of the auxiliary liquid produced in the auxiliary liquid preparation step is supplied to the mixer chamber, and an appropriate amount of the flocculant powder is supplied to the mixer chamber and mixed and dissolved in the auxiliary liquid. ,
After the mixed solution produced in the flocculant mixing step is discharged out of the mixer chamber and mixed with the remainder of the auxiliary liquid, a part of the mixed solution is supplied again to the mixer chamber and the flocculant mixed Concentration adjustment step for making a flocculant liquid increased to a predetermined concentration by repeating the same mixing and dissolving operation as in the step, and
A method for producing a flocculant liquid for wastewater treatment, comprising a curing step of curing the flocculant liquid produced in the concentration adjusting step to a required viscosity while stirring.   In the flocculant mixing step, a part of the auxiliary liquid produced in the auxiliary liquid preparation step is supplied into the mixer chamber while generating a cyclone flow on the supply port side of the mixer chamber, and the cyclone flow The method for producing a flocculant liquid for wastewater treatment according to claim 1, wherein an appropriate amount of the flocculant powder is supplied.   The said auxiliary liquid preparation process supplies the said water and auxiliary agent to the said mixer chamber, and after making an auxiliary liquid, it discharges | emits once out of the said mixer chamber temporarily. Production method.   The flocculant liquid for waste mud treatment according to claim 3, wherein the water is supplied into the mixer chamber while generating a cyclone flow on the supply port side of the mixer chamber, and an appropriate amount of the auxiliary agent is supplied to the cyclone flow. Production method. Used in the production method according to claim 1,
A horizontal mixer having a mixer chamber and a supply port provided on the upper side of the mixer chamber and a discharge port provided on the lower side of the mixer chamber;
A stirring tank having a supply port provided on the upper side and a discharge port provided on the lower side;
An auxiliary agent supplying means for supplying the auxiliary agent to the supply port of the mixer, an aggregating agent supplying means for supplying the flocculant powder, and a water supplying means for supplying water;
A first liquid tank for feeding the mixed solution made in the mixer chamber from a mixer discharge port, and a first transfer means for sending the mixed solution in the first liquid tank to the supply port of the stirring tank;
A second liquid tank for feeding the mixed solution stirred in the stirring tank from a tank discharge port; and a second transfer means for feeding the mixed solution in the second liquid tank to the supply port of the mixer. Equipment for manufacturing flocculant liquid for wastewater treatment.   The mixer has the supply port at two locations apart from each other, supplies water from the water supply unit to one supply port, or supplies auxiliary agent from the auxiliary supply unit, and supplies to the other supply port. The apparatus for producing a flocculant liquid for waste mud treatment according to claim 5, wherein the mixed solution in the second liquid tank is supplied from the second transfer means or the flocculant powder is supplied from the flocculant supply means. The supply port has a substantially cylindrical shape, and the water supply means and the second transfer means can form a cyclone flow by injecting water or a mixed solution in the cylindrical inner peripheral direction of the supply port. The apparatus for producing a flocculant liquid for waste mud treatment according to claim 5 or 6.

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