Drug dispensing device and drug dispensing method

Abstract

To provide a chemical addition device that has a simple structure and is capable of steadily supplying a chemical.SOLUTION: A chemical addition device 5 is equipped with a chemical injection pipe 10 having a plurality of nozzle holes 11, and a guide 12 for guiding the chemical to a dehydrated cake.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a chemical adding apparatus and a chemical adding method. [Background Art]

[0002] In the dewatering performed by a screw press or a belt press, injecting a liquid chemical (i.e., chemical solution) such as a polymer flocculant or an inorganic flocculant into concentrated sludge (i.e., sludge obtained by concentrating flocculated sludge that has undergone flocculation and stirring after adding a polymer flocculant) improves the dewaterability of the concentrated sludge. When injecting the chemical, uniformly injecting the chemical into the concentrated sludge leads to greater effects, while uneven distribution during dropping results in insufficient dewatering. [Prior Art Literature] [Patent Literature]

[0003] [Patent Literature 1] Japanese Unexamined Patent Publication No. 2020-142242 [Summary of the Invention] [Problem to be Solved by the Invention]

[0004] In a flocculant adding apparatus provided with an overflow weir (see, for example, Patent Literature 1), depending on the flow rate of the chemical and the number of notches, the flow rate of the chemical per site becomes low, and extremely high processing accuracy is required to allow the chemical to flow uniformly. In addition, it is difficult to keep the chemical flowing uniformly due to factors such as solidification of the chemical caused by drying, and irreversible adjustment such as polishing with a file may be required.

[0005] Furthermore, depending on the working environment and dilution conditions, deposits and debris may accumulate in the weir portion of the overflow weir. Once deposits accumulate, the chemical will have difficulty flowing through the V-shaped section of the overflow weir, resulting in an uneven flow rate. To correct this uneven flow rate, it is necessary to physically remove only the deposits with a file or similar tool, or to thoroughly clean the area with a cleaning solution. Since the overflow weir is open, it is necessary to drain the entire contents of the weir to prevent the cleaning solution from entering.

[0006] Therefore, the present invention aims to provide a drug dispensing device and a drug dispensing method that can stably supply drugs with a simple structure. [Means for solving the problem]

[0007] In one embodiment, a device is provided for adding a chemical agent to a dewatered cake obtained by gravity filtration or compression of flocculated sludge to which a polymer flocculant has been added in a concentration device. The chemical agent adding device comprises a chemical injection pipe having a plurality of nozzle holes for uniformly distributing the chemical agent, and a guide for guiding the chemical agent from at least one of the plurality of nozzle holes to the dewatered cake.

[0008] In one embodiment, the drug injection tube has a supply section formed on one end of the drug injection tube for supplying the drug, and a closing section formed on the other end of the drug injection tube, and the plurality of nozzle holes are arranged between the supply section and the closing section. In one embodiment, the guide has a structure that protrudes from the surface of the drug injection tube. In one embodiment, the guide is configured to be movable in the direction in which the drug injection tube extends.

[0009] In one embodiment, the diameter of the multiple nozzle holes increases from the supply section toward the closing section. In one embodiment, the guide has a winding structure that blocks a portion of at least one of the plurality of nozzle holes and / or blocks all of any of the plurality of nozzle holes. In one embodiment, the guide has a hook structure that is inserted into at least one of the plurality of nozzle holes.

[0010] In one embodiment, the drug addition device includes a branching guide attached to the guide that directs the drug to the dewatered cake. In one embodiment, the drug addition device is equipped with a watering device that sprays cleaning water onto the surface of the drug injection tube.

[0011] In one embodiment, a method is provided for adding a chemical agent to a dewatered cake obtained by gravity filtration or compression of flocculated sludge to which a polymer flocculant has been added in a concentrating device. The chemical agent addition method involves supplying the chemical agent to a chemical injection pipe having a plurality of nozzle holes for uniform distribution of the chemical agent, and adding the chemical agent to the dewatered cake through a guide that directs the chemical agent to the dewatered cake from at least one of the plurality of nozzle holes. [Effects of the Invention]

[0012] The drug dispensing device has a structure that guides the drug dispensed from the nozzle hole of the drug injection tube to the dewatered cake. This simple structure allows the drug dispensing device to supply the drug stably. [Brief explanation of the drawing]

[0013] [Figure 1] This is a schematic diagram showing one embodiment of a sludge treatment device. [Figure 2] This flowchart shows a sludge treatment method applied to a sludge treatment apparatus. [Figure 3] This figure shows one embodiment of a drug dispensing device. [Figure 4] This figure shows another embodiment of the drug infusion tube. [Figure 5] This figure shows an example of the application of a drug infusion tube. [Figure 6] This figure shows an example of the application of a drug infusion tube. [Figure 7] This is a diagram showing the entire guide. [Figure 8]It is a diagram showing a hanging portion inserted into a dewatered cake. [Figure 9] Figs. 9(a) and 9(b) are diagrams showing a guide wound around a chemical injection tube. [Figure 10] Figs. 10(a) and 10(b) are diagrams showing a guide wound around a chemical injection tube. [Figure 11] Figs. 11(a) to 11(e) are diagrams showing other embodiments of the guide. [Figure 12] It is a diagram showing another embodiment of a chemical injection tube. [Figure 13] It is a diagram showing an example of mounting the guide to a chemical injection tube. [Figure 14] Figs. 14(a) to 14(c) are diagrams showing other embodiments of the guide. [Figure 15] Figs. 15(a) and 15(b) are diagrams showing other embodiments of a chemical injection tube. [Figure 16] Figs. 16(a) and 16(b) are diagrams showing other embodiments of a chemical injection tube. DETAILED DESCRIPTION OF EMBODIMENTS

[0014] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the drawings described below, the same or corresponding components are denoted by the same reference signs, and duplicate descriptions are omitted. In the plurality of embodiments described below, the configuration of one embodiment that is not specifically described is the same as that of other embodiments, and therefore duplicate descriptions thereof are omitted.

[0015] Fig. 1 is a schematic diagram showing one embodiment of a sludge treatment apparatus. As shown in Fig. 1, the sludge treatment apparatus 100 includes: a polymer flocculant dissolution tank 1 for preparing a polymer flocculant; an inorganic flocculant storage tank 2 for storing an inorganic flocculant; a flocculation tank 3 in which organic sludge and the polymer flocculant are mixed; a concentration device 4 that forms a dewatered cake by dewatering flocculated sludge formed in the flocculation tank 3; a chemical addition device 5 that adds an inorganic flocculant to the dewatered cake; and a dewatering machine 6 that mechanically dewaters the dewatered cake to which the inorganic flocculant has been added.

[0016] In this embodiment, the inorganic flocculant is an example of a liquid agent used for dewatering the dewatered cake. Another example of an agent is a polymer flocculant. Therefore, the inorganic flocculant storage tank 2 may also be called the agent storage tank 2.

[0017] The drug addition device 5 is configured to add liquid drugs (for example, inorganic flocculants, polymer flocculants), but in one embodiment, the drug addition device 5 may use a liquid such as tap water or secondary treated water, or an acidic or basic liquid as the drug to be added.

[0018] Figure 2 is a flowchart showing a sludge treatment method applied to a sludge treatment apparatus. As shown in Figure 2, the sludge treatment method comprises a flocculation step S101 in which a polymer flocculant is added to organic sludge to form flocculated sludge, a flocculated sludge dewatering step S102 in which the flocculated sludge formed in the flocculation step is dewatered, an inorganic flocculant addition step (chemical addition step) S103 in which an inorganic flocculant is added to the dewatered cake formed in the flocculated sludge dewatering step S102, and a mechanical dewatering step S104 in which the dewatered cake to which the inorganic flocculant has been added is mechanically dewatered.

[0019] As shown in Figure 1, the polymer flocculant is prepared in the polymer flocculant dissolving tank 1, and the prepared polymer flocculant is supplied from the polymer flocculant dissolving tank 1 to the flocculation tank 3. Organic sludge is introduced into the flocculation tank 3. The organic sludge and polymer flocculant are mixed in the flocculation tank 3 to form flocculated sludge. The flocculated sludge is supplied to the thickening device 4 through piping.

[0020] In the concentration device 4, the flocculated sludge is dewatered by methods such as gravity filtration or compression to form a dewatered cake. The shape of the dewatered cake is not particularly limited, but considering the dispersibility of the inorganic flocculant, it is preferable that the dewatered cake has a flat plate shape. An example of a filter material used in the concentration device 4 is a filter cloth or a screen. The dewatered cake is supplied to the chemical addition device 5 directly (e.g., by dropping) or by a conveyor (not shown). The chemical addition device 5 continuously adds the chemical (in this embodiment, an inorganic flocculant) supplied from the inorganic flocculant storage tank 2 to the dewatered cake.

[0021] The dewatered cake to which the chemical agent has been added is transported to the dewatering machine 6 and mechanically dewatered. As a result, a dewatered product is obtained. In this embodiment, since the sludge treatment device 100 is equipped with a chemical agent addition device 5, the moisture content of the dewatered product is further reduced, and as a result, the amount of waste is reduced. The structure of the chemical agent addition device 5 will be described in detail below with reference to the drawings.

[0022] Figure 3 shows one embodiment of a drug dispensing device. As shown in Figure 3, the drug dispensing device 5 includes a drug injection tube 10 having a plurality of nozzle holes 11 for uniformly distributing a liquid drug (in this embodiment, an inorganic flocculant), and a guide 12 for guiding the drug from at least one of the plurality of nozzle holes 11 to the dewatered cake.

[0023] The drug injection tube 10 has a supply section 10a for supplying the drug, formed on one end, and a closing section 10b formed on the other end. In this embodiment, the drug injection tube 10 has a bottomed cylindrical shape. A PVC pipe can be given as an example of the drug injection tube 10.

[0024] The supply section 10a is the open end of the drug injection tube 10, and the closing section 10b is the closed end of the drug injection tube 10. Multiple nozzle holes 11 are located between the supply section 10a and the closing section 10b. Therefore, by supplying the drug through the supply section 10a with the closing section 10b closed by a closing member such as a cap, plug, or valve, the drug is discharged (dripped) from at least one of the multiple nozzle holes 11.

[0025] Each of the multiple nozzle holes 11 has a hole diameter corresponding to the number of drug discharge points and the flow rate of the drug. In the embodiment shown in Figure 3, the multiple nozzle holes 11 are arranged in a single line in the direction in which the drug injection tube 10 extends (in other words, the axial direction of the drug injection tube 10).

[0026] Figure 4 shows another embodiment of the drug injection tube. As shown in Figure 4, the plurality of nozzle holes 11 may be arranged in only two rows in a straight line along the direction in which the drug injection tube 10 extends, if necessary. In one embodiment, the plurality of nozzle holes 11 may be randomly arranged between the supply section 10a and the closing section 10b.

[0027] The orientation of the nozzle hole 11 is not particularly limited. However, if the nozzle hole 11 is positioned to face vertically downwards, for example, the drug in the drug injection tube 10 will drip out over a long period of time due to gravity. Therefore, it is preferable to position the nozzle hole 11 to face upwards (diagonally upwards or directly upwards) from the horizontal. This arrangement allows control of the direction of drug flow and makes it easy to bring the drug discharged from the nozzle hole 11 into contact with the guide 12.

[0028] When the drug is supplied to the drug injection tube 10, the drug flows from the supply section 10a towards the closing section 10b. Therefore, the flow rate of the drug discharged from the nozzle hole 11 is greater on the supply section 10a side than on the closing section 10b side. Accordingly, in order to balance the flow rate on the closing section 10b side and the flow rate on the supply section 10a side, the diameters of the multiple nozzle holes 11 may increase from the supply section 10a towards the closing section 10b.

[0029] Figures 5 and 6 show examples of applications for drug injection tubes. As shown in Figure 5, the drug dispensing device 5 may be arranged in a T-shape by connecting the drug injection tubes 10, 10 to the tee tube 15A. As shown in Figure 6, the drug dispensing device 5 may be arranged in an L-shape by connecting the drug injection tubes 10 to the elbow tube 15B.

[0030] Figure 7 shows the overall structure of the guide. As shown in Figure 7, the guide 12 has a winding portion 12a wrapped around the drug injection tube 10 and a suspension portion 12b extending from the winding portion 12a toward the dewatered cake. In this embodiment, the winding portion 12a and the suspension portion 12b are made of the same material, but they may be made of different materials. In one embodiment, the guide 12 has a winding portion 12a but does not have a suspension portion 12b.

[0031] As shown by the arrow in Figure 7, the guide 12 is configured to be movable in the direction in which the drug injection tube 10 extends. More specifically, the winding portion 12a of the guide 12 is loosely wrapped around the drug injection tube 10. Therefore, the winding portion 12a, together with the suspension portion 12b, is movable in the direction in which the drug injection tube 10 extends, and of course, it is rotatable perpendicular to the drug injection tube 10 (i.e., vertically). In the embodiment shown in Figure 7, the lower end of the suspension portion 12b is located above the dewatered cake being conveyed.

[0032] The chemical agent discharged from the nozzle hole 11 flows down through the winding section 12a and the suspension section 12b, and is introduced onto the surface of the dewatered cake. The guide 12 having the suspension section 12b can reliably add a fixed amount of chemical agent flowing down the suspension section 12b to the target position on the dewatered cake. As a result, the chemical agent addition device 5 can efficiently reduce the moisture content of the dewatered product obtained in the end, thereby reducing the amount of waste.

[0033] The guide 12 is preferably made of a thin, flexible material (for example, a cable tie). This configuration allows for localized and precise application of the agent to the dehydrated cake without hindering its transport. To ensure precise application of the agent to the dehydrated cake, the guide 12 may have a tapered shape.

[0034] The guide 12 preferably has a simple structure and is made of inexpensive, general-purpose material (for example, a cable tie). With such a configuration, if the guide 12 becomes dirty, it can be removed and cleaned, and if the guide 12 becomes heavily soiled, it can be easily replaced.

[0035] Figure 8 shows a suspension section inserted into a dewatered cake. As shown in Figure 8, the lower end of the suspension section 12b may be located inside the dewatered cake being conveyed. With this configuration, the drug addition device 5 can add the drug to the slits while forming slits in the dewatered cake being conveyed by the suspension section 12b. As a result, the drug addition device 5 can penetrate the drug into the interior of the dewatered cake.

[0036] Figures 9(a) and 9(b) show a guide wrapped around a drug injection tube. As shown in Figure 9(a), the guide 12 may have a wrapping structure that blocks a portion of at least one of the multiple nozzle holes 11. By blocking a portion of the nozzle hole 11 with the guide 12, the guide 12 can adjust the flow rate of the drug discharged from the nozzle hole 11.

[0037] The discharge flow rate of the drug from the nozzle hole 11 is proportional to the amount of drug supplied to the drug injection pipe 10 and inversely proportional to the area of ​​the nozzle hole 11. Therefore, by blocking a portion of the nozzle hole 11 with the guide 12, the area of ​​the nozzle hole 11 can be adjusted without changing the diameter of the nozzle hole 11. By blocking a portion of the nozzle hole 11 with the guide 12, the discharge flow rate of the drug can be adjusted, and at the same time, the drug can be easily allowed to flow down along the guide 12 (more specifically, the suspension part 12b).

[0038] The width of the winding portion 12a of the guide 12 may be larger or smaller than the diameter of the nozzle hole 11. The size of the guide 12, including the width of the winding portion 12a, is selected according to the type and flow rate of the chemical agent, the operating method of the chemical dispensing device 5, and the installation environment.

[0039] As shown in Figure 9(b), the guide 12 may have a winding structure that completely blocks any of the multiple nozzle holes 11. By blocking the entire nozzle hole 11 with the guide 12, the guide 12 can prevent the drug from being discharged from the nozzle hole 11. In the embodiment shown in Figure 9(b), the width of the winding portion 12a is greater than the diameter of the nozzle hole 11.

[0040] According to this embodiment, the drug dispensing device 5 has a structure in which the guide 12 guides the drug discharged from the nozzle hole 11 of the drug injection tube 10 to the dewatered cake. With such a simple structure, the drug dispensing device 5 can stably supply the drug.

[0041] The drug addition device 5 can adjust the flow rate of the drug from the nozzle hole 11 by adjusting the position (and orientation) of the guide 12. In a coagulant addition device equipped with an overflow weir (see, for example, Patent Document 1), the drug is added to the dewatered cake by the rise in its liquid level. Therefore, if the machining accuracy of the overflow weir is not high, there is a risk that the drug cannot be reliably added to the target position on the dewatered cake. On the other hand, in this embodiment, the drug is added to the dewatered cake by the pressure of the drug supplied to the drug injection pipe 10. With this structure, the drug can be reliably added to the target position on the dewatered cake even if the machining accuracy of the nozzle hole is low.

[0042] Furthermore, according to this embodiment, unlike the structure in which chemicals are supplied through an overflow weir, the chemical injection pipe 10, which has a tubular shape, is not open. Therefore, it is possible to prevent foreign matter such as debris from entering the chemical injection pipe 10.

[0043] Furthermore, in a structure that supplies chemicals through an overflow weir, if the flow rate of the chemical is low, the chemical may not stably overflow the weir. However, in this embodiment, by adjusting the size of the nozzle hole 11, the chemical can be stably discharged from the nozzle hole 11 even when a low flow rate of chemical is supplied.

[0044] Even if the outflow of the chemical from the nozzle hole 11 is obstructed by the adhesion of a substance (e.g., a chemical), the substance can be easily removed from the nozzle hole 11 by using a jig (e.g., an awl, a drill bit corresponding to the diameter of the nozzle hole 11).

[0045] Since the area of ​​the nozzle hole 11 in the drug injection tube 10 is extremely small, the drug injection tube 10 can be easily cleaned. Therefore, the drug addition device 5 may be equipped with a watering device 20 that sprays cleaning water onto the surface of the drug injection tube 10 (see Figure 3). The watering device 20 is positioned above the drug injection tube 10 (and guide 12) and is configured to spray cleaning water in a shower-like manner.

[0046] Tap water can be cited as an example of washing water, but in order to prevent the precipitation of precipitates caused by reactions with chemicals, it is desirable that the washing water is a liquid that does not contain or contains low amounts of components that form precipitates, or a liquid that contains components that do not react easily with chemicals.

[0047] The watering device 20 may spray cleaning water when deposits adhere to the chemical injection pipe 10 (and guide 12), and may also spray cleaning water periodically. By spraying cleaning water periodically, the risk caused by the adhesion of deposits can be reduced. Even when cleaning water is sprayed, the cleaning water does not penetrate into the chemical injection pipe 10 through the nozzle hole 11, so there is no risk of the chemical being diluted by the cleaning water.

[0048] The watering device 20 may spray cleaning water onto the guide 12 before the start of chemical discharge from the nozzle hole 11, thereby wetting the guide 12. Wetting the guide 12 allows the chemical to flow smoothly along the guide 12.

[0049] The drug dispensing device 5 may be equipped with an on / off valve (not shown) located at the closing portion 10b of the drug injection tube 10, as a structure for closing the drug injection tube 10. By supplying cleaning water forcefully to the drug injection tube 10 with the on / off valve open, the inside of the drug injection tube 10 and the nozzle hole 11 can be cleaned. Such cleaning is effective when the drug dispensing device 5 is not used for a long period of time or when the drug inside the drug injection tube 10 has deteriorated.

[0050] Figures 10(a) and 10(b) show a guide wrapped around a drug injection tube. In the embodiments shown in Figures 10(a) and 10(b), the guide 12 has a wrapping portion 12a but does not have a suspension portion 12b. Thus, the guide 12 may have a structure that protrudes from the surface of the drug injection tube 10 (i.e., the wrapping portion 12a). Even with such a structure, the drug discharged from the nozzle hole 11 travels along the guide 12 and is added to the target position of the dewatered cake.

[0051] In one embodiment, the guide 12 may not have a structure wrapped around the drug injection tube 10, but may be a projection that contacts or is positioned adjacent to the nozzle hole 11. Even with such a structure, the drug discharged from the nozzle hole 11 travels along the guide 12 and is added to the target position of the dewatered cake.

[0052] As shown in Figure 10(a), the guide 12 is wrapped around the drug injection tube 10 so as to straddle the nozzle hole 11 of the drug injection tube 10. The guide 12 has a binding portion 13 formed on it by the wrapping. By aligning the binding portion 13 of the guide 12 with the nozzle hole 11, a small gap is formed between the binding portion 13 and the nozzle hole 11. Therefore, when drug is supplied to the drug injection tube 10, the drug is discharged from the nozzle hole 11 through this gap.

[0053] As shown in Figure 10(b), by rotating the guide 12 and shifting the binding portion 13 away from the nozzle hole 11, the nozzle hole 11 is blocked by the winding portion 12a of the guide 12. As a result, the discharge of the drug from the nozzle hole 11 is prevented.

[0054] As described above, the discharge flow rate of the drug from the nozzle hole 11 is inversely proportional to the area of ​​the nozzle hole 11. Therefore, by slightly rotating the guide 12 and slightly shifting the binding portion 13 away from the nozzle hole 11, a portion of the nozzle hole 11 is blocked by the winding portion 12a of the guide 12. As a result, a small amount of the drug is discharged from a portion of the nozzle hole 11. In this way, the discharge flow rate of the drug can be adjusted by adjusting the area of ​​the nozzle hole 11.

[0055] Figures 11(a) to 11(e) show other embodiments of the guide. As shown in Figure 11(a), the guide 12 may have a winding portion 12a and a suspension portion 12b extending vertically downward from the winding portion 12a. As shown in Figure 11(b), the guide 12 may have a supporter 21A that supports the suspension portion 12b. The supporter 21A is connected to the winding portion 12a and the suspension portion 12b to fix the position of the suspension portion 12b.

[0056] In the embodiment shown in Figure 11(b), the supporter 21A is made of the same material as the winding portion 12a and the suspension portion 12b. However, as shown in Figure 11(c), the guide 12 may have a supporter 21B made of a different material from the winding portion 12a and the suspension portion 12b.

[0057] As shown in Figure 11(d), the suspension portion 12b does not necessarily have to extend vertically downwards, but may extend diagonally downwards. The operator can easily change the direction in which the suspension portion 12b extends by rotating the winding portion 12a.

[0058] As shown in Figure 11(e), the drug dispensing device 5 may include a branching guide 22 attached to the guide 12 that guides the drug to the dewatered cake. The branching guide 22 is connected to the winding section 12a. In the embodiment shown in Figure 11(e), the branching guide 22 extends in the same direction as the suspension section 12b, but it may extend in a different direction from the suspension section 12b. Examples of the branching guide 22 include cable ties, wire, or fishing line.

[0059] The drug discharged from the nozzle hole 11 flows down along the suspension section 12b and also flows down along the branching guide 22. Therefore, the drug adding device 5 can add the drug to multiple target positions on the dewatered cake. In the embodiment shown in Figure 11(e), the drug adding device 5 is equipped with a single branching guide 22, but in one embodiment, it may be equipped with multiple branching guides 22.

[0060] Figure 12 shows another embodiment of the drug injection tube. As shown in Figure 12, the drug injection tube 10 may have a flat portion 10c formed at its lowest point. This structure creates a gap between the drug injection tube 10 and the winding portion 12a, allowing the operator to easily attach the branching guide 22 (see Figure 11(e)) to the winding portion 12a.

[0061] Figure 13 shows an example of attaching the guide to the drug injection tube. As shown in Figure 13, the guide 12 may be attached perpendicular to the drug injection tube 10, or it may be attached at an angle to the drug injection tube 10. In particular, by attaching the guide 12 so that it overlaps the bottom of the nozzle hole 11, the guide 12 can reliably make contact with the winding portion 12a of the drug discharged from the nozzle hole 11.

[0062] Figures 14(a) to 14(c) show other embodiments of the guide. As shown in Figure 14(a), the drug dispensing device 5 may include a guide 32 having a hook structure that is inserted into at least one of the plurality of nozzle holes 11.

[0063] As shown in Figures 14(a) and 14(b), the guide 32 has a hook portion 32a that is hooked onto the nozzle hole 11 and a suspension portion 32b that extends from the hook portion 32a. One example of the guide 32 is a wire. In the embodiment shown in Figure 14(b), the suspension portion 32b extends linearly from the hook portion 32a, but as shown in Figure 14(c), the suspension portion 32b may be curved along the surface of the drug injection tube 10. In Figure 14(c), the curved suspension portion 32b extends vertically downward. In this embodiment as well, the guide 32 does not need to be made of a single material, but may be made of multiple materials.

[0064] In the embodiments described above, one guide 12 is provided for one nozzle hole 11, but multiple guides 12 may be provided for one nozzle hole 11. Furthermore, in the embodiments described above, the guide 12 has at least a structure that protrudes from the surface of the drug injection tube 10 (i.e., a winding portion 12a), but it is not necessarily limited to such a structure. In one embodiment, the guide 12 may be a recess formed on the surface of the drug injection tube 10.

[0065] Figures 15(a) and 15(b) show other embodiments of the drug infusion tube. As shown in Figures 15(a) and 15(b), the drug infusion tube 10 may have a scale 40 positioned adjacent to the nozzle hole 11 (i.e., the guide 12). The scale 40 is formed on the surface of the drug infusion tube 10. In this embodiment, multiple scales 40 are formed, but at least one scale 40 may be formed.

[0066] By forming the scale 40, the operator can visually observe the flow rate of the drug spreading on the surface of the drug injection tube 10 and adjust the flow rate of the drug according to the flow rate. In the embodiment shown in Figure 15(a), the amount of drug spreading on the surface of the drug injection tube 10 is approximately 1.5 scale divisions from the nozzle hole 11. In the embodiment shown in Figure 15(b), the amount of drug spreading on the surface of the drug injection tube 10 is approximately 2.5 scale divisions from the nozzle hole 11.

[0067] The operator can determine whether the amount of chemical spreading on the surface of the chemical injection tube 10 has reached a predetermined reference scale, counting from the nozzle hole 11. If the chemical has reached the reference scale, the operator may adjust the guide 12 to adjust the flow rate of the chemical.

[0068] Figures 16(a) and 16(b) show other embodiments of the drug infusion tube. As shown in Figures 16(a) and 16(b), the drug infusion tube 10 may have a recess 10d formed on its surface. In the embodiments shown in Figures 16(a) and 16(b), the recess 10d has a V-shape, but the shape of the recess 10d is not limited to this embodiment. The recess 10d is formed between adjacent nozzle holes 11 (i.e., guides 12).

[0069] If the distance between adjacent guides 12 is small, the drugs discharged from adjacent nozzle holes 11 may flow together as a single unit. As shown in Figures 16(a) and 16(b), by forming a recess 10d on the surface of the drug injection tube 10, the drug will flow around the recess 10d. Therefore, to prevent the drugs from becoming a single unit, the drug injection tube 10 may be provided with a recess 10d.

[0070] In the embodiment shown in Figure 16(a), the recess 10d is partially formed at the lowest position of the drug injection tube 10. In the embodiment shown in Figure 16(b), the recess 10d is formed around the entire circumference of the drug injection tube 10.

[0071] The embodiments described with reference to Figures 1 to 16 may be combined as appropriate. For example, the guide 12 according to the embodiment shown in Figures 9(a) and 9(b) may be combined with the guide 12 according to the embodiment shown in Figures 10(a) and 10(b).

[0072] Although embodiments of the present invention have been described above, it goes without saying that the present invention is not limited to the embodiments described above and may be implemented in various different forms within the scope of its technical concept. [Explanation of Symbols]

[0073] 1. Polymer flocculant dissolution tank 2. Inorganic flocculant storage tank 3 Coagulation tank 4 Concentrator 5. Drug dispensing device 6 Dehydrator 10 Drug infusion tubes 10a Supply section 10b Closing part 10c flat part 10d recess 11 Nozzle holes 12 Guides 12a Wrapping section 12b Suspension section 13 Binding part 15A Cheese tube 15B Elbow Pipe 20 Sprinkler system 21A Supporter 21B Supporter 22 Branching Guide 32 Guide 32a Hook section 32b Suspension section 40 divisions

Claims

1. In a device for adding chemicals to a dewatered cake obtained by gravity filtration or compression of flocculated sludge to which a polymer flocculant has been added, A drug injection tube having multiple nozzle holes for uniformly distributing the drug, The system includes a guide having a structure that allows the agent to flow down from at least one of the plurality of nozzle holes and guide it to the dewatered cake, A drug injection device in which the plurality of nozzle holes are arranged in the axial direction of the drug injection tube.

2. The drug injection tube is A supply section for supplying the drug is formed on one side of the drug injection tube, It has a closing portion formed on the other side of the drug injection tube, The drug dispensing device according to claim 1, wherein the plurality of nozzle holes are arranged between the supply unit and the closing unit.

3. The drug dispensing device according to claim 1, wherein the guide has a structure that protrudes from the surface of the drug injection tube.

4. The drug dispensing device according to claim 1, wherein the guide is configured to be movable in the direction in which the drug injection tube extends.

5. The drug dispensing device according to claim 2, wherein the diameters of the plurality of nozzle holes increase from the supply section toward the closing section.

6. The drug dispensing device according to claim 1, wherein the guide has a winding structure that blocks a portion of at least one of the plurality of nozzle holes and / or blocks all of any of the plurality of nozzle holes.

7. The drug dispensing device according to claim 1, wherein the guide has a hook structure inserted into at least one of the plurality of nozzle holes.

8. The drug adding device according to claim 1, wherein the drug adding device is equipped with a branching guide attached to the guide for guiding the drug to the dewatered cake.

9. The drug addition device according to claim 1, wherein the drug addition device is equipped with a watering device for spraying cleaning water onto the surface of the drug injection tube.

10. In a method of adding a chemical agent to a dewatered cake obtained by gravity filtration or compression of flocculated sludge to which a polymer flocculant has been added using a concentration device, The drug is supplied to a drug injection tube having multiple nozzle holes for uniformly distributing the drug. The agent is added to the dehydrated cake through a guide having a structure that allows the agent to flow down and guide it to the dehydrated cake, from at least one of the plurality of nozzle holes. A method for adding a drug, wherein the plurality of nozzle holes are arranged in the axial direction of the drug injection tube.

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