Water treatment equipment

Abstract

To provide water treatment equipment in which a coagulation chamber is provided in a reaction tank and a coagulation state in the coagulation chamber is easily and directly confirmed.SOLUTION: Water treatment equipment is provided, comprising: a reaction tank; a chamber which is arranged in the reaction tank and to which treatment object water is introduced; a distributor connected to the chamber and dispersively supplying the treatment object water into the reaction tank; coagulant addition means adding a coagulant into the chamber; and an inspection stand arranged so that an operator can move to a position enabling the operator to confirm a coagulation state in the chamber. According to the present invention, the direct confirmation of coagulation state in the chamber becomes easy. Thus, an inspection of a formation condition of a flock becomes easy. An operation adjustment of the water treatment equipment based on the inspection result can also be efficiently performed.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a water treatment device, and more particularly to a water treatment device including a chamber in a reaction tank into which water to be treated is introduced. [Background technology]

[0002] As one of the water treatment methods for treating water to be treated such as wastewater, there is known a method in which the water to be treated is supplied to a reaction tank and then treated in the reaction tank. One such water treatment method is a solid-liquid separation method in which the water to be treated is supplied to a settling tank and impurities such as solids are removed from the water to be treated.

[0003] For example, Patent Document 1 describes a coagulation and sedimentation treatment device that adds a coagulant to the water to be treated and forms a thickened floc layer in an inner tank provided in a coagulation and sedimentation tank (separation tank). Patent Document 1 also describes that treated water discharged from the coagulation and sedimentation tank is introduced into a sampling tank and the turbidity and pH are measured. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2002-35503 A Summary of the Invention [Problem to be solved by the invention]

[0005] The coagulation and sedimentation treatment device described in Patent Document 1 introduces treated water discharged from a reaction tank (coagulation and sedimentation tank) into a sampling tank, and measures water quality data such as turbidity and pH, which are used for data management of the treated water quality. On the other hand, in a water treatment apparatus that performs coagulation and settling, it is desirable to check not only the water quality of the treated water but also the coagulation state of the flocs formed in the reaction tank and to reflect the confirmation results in the operating conditions to perform stable treatment and maintain good water quality.

[0006] To check the flocculation state of flocs formed in the reaction tank, the inside of the reaction tank can be visually inspected from the top of the reaction tank or flocs concentrated in the reaction tank can be sampled. However, the flocs that can be checked are those after flocculation, and it is difficult to check the state of floc formation or the state of flocs during the flocculation process. Therefore, a means is required to directly check the state of the water to be treated during treatment operation and to grasp the flocculation state. In particular, when the reaction tank is equipped with a chamber into which the water to be treated is introduced, a means is required to directly check the inside of the chamber, rather than a means for checking the inside of the reaction tank.

[0007] An object of the present invention is to provide a water treatment device that has a chamber in a reaction tank into which the water to be treated is introduced, and that makes it easy to directly check the state of the water to be treated in the chamber. [Means for solving the problem]

[0008] As a result of thorough investigation into the above-mentioned problems, the inventors discovered that by providing an inspection stand in a chamber provided in a reaction tank at a position where operators can check the condition inside the chamber, it becomes easier to check the inside of the chamber and to directly check the condition of the water to be treated inside the chamber, and thus completed the present invention. That is, the present invention provides the following water treatment device.

[0009] In order to solve the above problems, the water treatment device of the present invention is characterized by comprising a chamber disposed within a reaction tank into which the water to be treated is introduced, and an inspection stand provided to allow an operator to move to a position where the condition of the water to be treated within the chamber can be checked.

[0010] According to the water treatment device of the present invention, an inspection platform is provided for a chamber provided in a reaction tank so that an operator can move to a position where the condition of the water to be treated in the chamber can be confirmed, making it easy to directly check the condition of the water to be treated in the chamber. This makes it possible to efficiently adjust the operation of the water treatment device based on the results of this check. In particular, when the water treatment device is a sedimentation treatment device, the degree of progress of the flocculation state in the chamber can be confirmed by directly checking the condition of the water to be treated in the chamber. This makes it easy to check the state of floc formation, making it possible to efficiently and accurately adjust the operation of the sedimentation treatment device.

[0011] In addition, one embodiment of the water treatment device of the present invention is characterized in that the inspection stand is disposed at a position where an operator can visually inspect and / or sample the inside of the chamber. This feature ensures that there is enough space for workers to smoothly carry out the tasks required to check and inspect the condition of the water being treated in the chamber, making it easier to directly check the condition of the water being treated in the chamber and enabling the tasks of checking and inspecting the condition of the water to be treated to be carried out quickly.

[0012] In addition, one embodiment of the water treatment device of the present invention is characterized in that it is equipped with a normal stand arranged to span the reaction tank, the bottom of the normal stand being located above the upper end of the chamber, and the bottom of the inspection stand being located below the upper end of the chamber. 2. Description of the Related Art Among water treatment devices having a reaction tank, there are known those that are provided with a stand for inspecting the reaction tank and equipment associated with the reaction tank. According to this feature, by arranging a normal stand that is arranged to be spanned across the reaction tank and an inspection stand for checking the condition of the treated water in the chamber so that they are separated above and below with the top end of the chamber as the reference point, it is possible to secure a working space in a position appropriate for each inspection object.

[0013] Furthermore, one embodiment of the water treatment device of the present invention is characterized in that an inspection stand is provided below the normal stand, and the normal stand and the inspection stand are connected so as to enable workers to move freely between the normal stand and the inspection stand. According to this feature, by connecting the normal stand and the inspection stand so that workers can move between them, it is possible to improve the work efficiency of the workers.

[0014] In addition, one embodiment of the water treatment device of the present invention is characterized in that the horizontal distance between the end of the chamber and the end of the inspection stand is within 0.5 m. According to this feature, by specifying the distance between the chamber and the inspection stand to within 0.5 m, workers can easily proceed with the work related to checking the inside of the chamber, which makes it possible to efficiently check the condition of the water to be treated inside the chamber. Effect of the Invention

[0015] According to the present invention, in a water treatment device having a chamber into which the water to be treated is introduced into a reaction tank, it is possible to provide a water treatment device in which it is easy to directly check the state of the water to be treated in the chamber. [Brief description of the drawings]

[0016] [Figure 1] FIG. 1 is a schematic explanatory diagram showing a water treatment device according to a first embodiment of the present invention. [Diagram 2] FIG. 2 is a schematic explanatory diagram showing one aspect of an inspection stand in the water treatment device according to the first embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic explanatory diagram showing a water treatment device according to a second embodiment of the present invention. [Figure 4] FIG. 4 is a schematic explanatory view showing one aspect of a chamber and an inspection stand in a water treatment device according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, embodiments of the water treatment device according to the present invention will be described in detail with reference to the drawings. Note that the structures of the water treatment device described in the embodiments are merely examples for the purpose of explaining the water treatment device according to the present invention, and the present invention is not limited thereto.

[0018] The water treatment device of this embodiment is used for water treatment in which water to be treated containing the object to be treated is introduced into a chamber provided in a reaction tank, the water to be treated is treated in the reaction tank, and the treated water is discharged. The types of water treatment are not particularly limited, but examples include water treatment in which a water treatment agent such as a chemical is added to the water to be treated that contains the target of treatment, biological treatment in which the water to be treated that contains organic matter as the target of treatment is brought into contact with microorganisms, and solid-liquid separation treatment in which the water to be treated that contains solid matter as the target of treatment is separated into treated water and solid matter (sediment).

[0019] The reaction tank in the water treatment device of this embodiment may be any known one related to water treatment, and is not particularly limited. For example, it may be a reaction tank used in organic wastewater treatment facilities such as sewage treatment plants, wastewater treatment plants, food factories, and pharmaceutical factories, inorganic wastewater treatment facilities such as plating factories, and water treatment facilities such as water purification plants. More specifically, it may be an aeration tank, an aerobic reaction tank, an anaerobic reaction tank, an oxidation ditch tank, a flocculation tank, a sedimentation tank, a sludge concentration tank, a sludge digestion tank, a storage tank, a disinfection tank, etc.

[0020] The water to be treated according to this embodiment is not particularly limited as long as it contains the target of treatment. For example, the water to be treated in the solid-liquid separation treatment is not particularly limited as long as it contains the solid matter to be separated and treated, and the source and type of the solid matter are not particularly limited. The water to be treated according to this embodiment also includes water in which solid matter precipitates due to the addition of chemicals or the like. Examples of the water to be treated include industrial wastewater, domestic wastewater, river water, and primary treated water from other water treatment facilities.

[0021] Hereinafter, a precipitation treatment apparatus for solid-liquid separation treatment will be described as a specific embodiment of the water treatment apparatus of the present invention. A precipitation treatment apparatus for solid-liquid separation treatment is known that includes a chamber into which the water to be treated is introduced into a reaction tank, and in which the flocculation of solid matter in the water to be treated is promoted by a flocculant. In this case, it is desirable to perform stable treatment and maintain good water quality by checking the flocculation state of the flocs and adjusting the operation based on the confirmation result. Therefore, the configuration of the water treatment apparatus of the present invention, which checks the state of the water to be treated in the chamber, can be suitably used. In the following embodiment, the water treatment device will mainly be described as a coagulation sedimentation treatment device that adds a coagulant to the water to be treated in a chamber and separates solids by coagulating and precipitating them, but the water treatment device is not limited to this.

[0022] [First embodiment] FIG. 1 is a schematic explanatory diagram showing the structure of a water treatment device 100A according to a first embodiment of the present invention. As shown in FIG. 1, the water treatment device 100A according to this embodiment is a coagulation sedimentation treatment device including a settling tank 10 as a reaction tank 1, and a mixing chamber 20 disposed in the settling tank 10 as a chamber into which the water to be treated W is introduced, which coagulates and flocculates solids in the water to be treated W. The water to be treated W, which contains flocs F coagulated by passing through the mixing chamber 20, is discharged into the settling tank 10 via a distributor 30, and the flocs F settle at the bottom of the settling tank 10, while a clear layer C, which is a supernatant, is formed at the top of the settling tank 10. The clarified treated water W1 is discharged by a treated water discharge section 40 provided on the upper side of the settling tank 10. The flocs F (sediment P) that settle at the bottom of the settling tank 10 are discharged from the center of the bottom of the settling tank 10 via a sludge discharge section 50. The water treatment device 100A further includes a scraping section 60 that scrapes the sediment P that settles at the bottom of the settling tank 10 toward the sludge discharge section 50. An inspection stand 70 is provided at a position where operator A can observe the inside of the mixing chamber 20.

[0023] Each component will be described below.

[0024] The settling tank 10 may be any tank capable of storing the water W to be treated, and there is no particular limitation on the specific structure. For example, the tank may be a cylinder with a bottom, the bottom of which is circular or polygonal. As shown in FIG. 1, the bottom of the settling tank 10 may have a structure that slopes toward the center of the settling tank 10, and a sludge removal recess 51, which will be described later, may be provided in the center of the bottom of the settling tank 10. This makes it possible to easily collect and discharge the flocs F (sediment P).

[0025] A normal stand T is provided on the top of the settling tank 10. In this case, the normal stand T is preferably disposed across the diameter of the settling tank 10. The bottom of the normal stand T is preferably disposed above the upper end of the mixing chamber 20. This allows the worker A to easily move around the components disposed above the settling tank 10 and to effectively perform inspection work. Note that examples of the objects that the worker A inspects using the normal stand T include, but are not limited to, components related to the drive unit M, inlet pipe 21, treated water discharge unit 40, etc., which will be described later.

[0026] The mixing chamber 20 is a cylindrical hollow member disposed upright in the center of the settling tank 10, and has a structure in which the top is open. A flow path 20a is formed in the mixing chamber 20, through which the water W to be treated flows. An inflow pipe 21 is connected to the mixing chamber 20 in order to introduce the water W to be treated into the mixing chamber 20. The inflow pipe 21 may be any pipe capable of introducing the water W to be treated into the mixing chamber 20. For example, as shown in FIG. 1, the inflow pipe 21 extends horizontally relative to the settling tank 10, penetrates the peripheral wall 10a of the settling tank 10, and extends to the inside of the settling tank 10 to connect to the mixing chamber 20.

[0027] The mixing chamber 20 is provided with a flocculant adding means for adding a flocculant to the water to be treated W introduced from the inlet pipe 21 in order to aggregate and flocculate solids in the water to be treated W. The flocculant adding means of this embodiment may be provided with a flocculant adding section 22 that adds a flocculant to the water W to be treated flowing through the flow path 20a in the mixing chamber 20. More specifically, a flocculant adding nozzle 22a is added to the flow path 20a as an example in Fig. 1, but the present invention is not limited to this. Another example may be provided with a flocculant adding section separately provided upstream of the inflow pipe 21, and flocculant is added to the water W to be treated from this flocculant adding section.

[0028] Examples of the flocculant to be mixed with the water to be treated W include inorganic flocculants and polymer flocculants. The flocculant may be an inorganic flocculant or a polymer flocculant alone, or an inorganic flocculant and a polymer flocculant in combination. When an inorganic flocculant and a polymer flocculant are used in combination, it is preferable to add the inorganic flocculant and the polymer flocculant to the water to be treated W in this order. This allows stable floc formation. Specific examples of the flocculant include inorganic flocculants such as aluminum sulfate and PAC, and Fe-based inorganic flocculants such as polyferrous sulfate. 2 Alkali such as H 2 SO 4Crystals may be precipitated by adding a pH adjuster using an acid such as HCl, a Ca, Al, or Fe compound, or an oxidizing or reducing agent. Examples of polymer flocculants include cationic polymer flocculants such as polyaminoalkyl methacrylate, polyethyleneimine, halogenated polydiallylammonium, chitosan, and urea-formalin resin, anionic polymer flocculants such as sodium polyacrylate, partial hydrolysates of polyacrylamide, partially sulfomethylated polyacrylamide, and poly(2-acrylamide)-2-methylpropane sulfate, nonionic polymer flocculants such as polyacrylamide and polyethylene oxide, and amphoteric polymer flocculants such as a copolymer of acrylamide, aminoalkyl methacrylate, and sodium acrylate.

[0029] A cylindrical rotary mixer 23 for mixing and stirring the water W to be treated and the coagulant is disposed in the mixing chamber 20. A shaft S extending in the height direction along the settling tank 10 is disposed in the rotary mixer 23, and the shaft S can be rotated about its axis by a driving device M such as a motor attached to the upper end. The mixing chamber 20 and the shaft S are not in contact with each other, and the shaft S passes through the mixing chamber 20.

[0030] A distributor 30 is fixed to the lower part of the shaft S for supplying the water W to be treated in the mixing chamber 20 to the settling tank 10. This distributor 30 is provided with a plurality of pipes that communicate with the inside of the mixing chamber 20 and extend horizontally and radially. In addition, a plurality of discharge holes 30a for discharging the water W to be treated that contains the flocs F formed in the mixing chamber 20 are provided toward the bottom of the settling tank 10. When the shaft S is driven to rotate, the distributor 30 rotates together with the shaft S, and the water W to be treated containing the flocs F in the mixing chamber 20 is evenly distributed and supplied into the settling tank 10 .

[0031] In addition, a scraping unit 60 is attached to the shaft S further below the mixing chamber 20 and the distributor 30. This scraping unit 60 can scrape the flocs F (sediment P) that are supplied from the distributor 30 and have settled at the bottom of the settling tank 10 toward the sludge discharge unit 50.

[0032] The sludge discharge unit 50 is not particularly limited in its specific structure as long as it can discharge the sediment P settled at the bottom of the settling tank 10 to the outside of the water treatment device 100A. As an example of the sludge discharge unit 50, as shown in Fig. 1, it can be composed of a sludge extraction recess 51 provided at the bottom of the settling tank 10, a sludge extraction pipe 52, a sludge extraction pump (not shown), and the like. Also, as shown in Fig. 1, it can be composed of a scraper 53 attached to a shaft S for scraping off the sediment P in the sludge extraction recess 51.

[0033] The scraping unit 60 is not particularly limited in terms of its specific structure, so long as it can scrape up the sediment P that has settled at the bottom of the settling tank 10 and scrape it toward the sludge discharge unit 50. As an example of the scraping unit 60, as shown in FIG. 1, it can be made up of a rotating shaft 61, a support rod 62, and a scraping blade 63.

[0034] The inspection stand 70 forms a work space where the worker A checks the coagulation state as the state of the treated water W in the mixing chamber 20, and is provided at a location where the worker A can visually inspect and / or sample the inside of the mixing chamber 20. More specifically, the inspection stand 70 is provided at a location where the worker A can visually inspect and / or sample the inside of the mixing chamber 20 from the top (opening) of the mixing chamber 20. By providing an inspection stand 70 and having an operator A visually inspect or sample the water W, it becomes possible to directly check the state (flocculation state) of the water W in the mixing chamber 20 during treatment operation. This makes it possible to inspect the state of floc formation and the state of the flocs during the flocculation process, and it becomes possible to efficiently adjust the operation of the water treatment device based on the inspection results.

[0035] The structure of the inspection stand 70 is not particularly limited as long as it can secure a working space for the worker A to visually inspect the inside of the mixing chamber 20 or to sample flocs from within the mixing chamber 20. The location of the inspection platform 70 may be any location suitable for the worker A to visually inspect the inside of the mixing chamber 20 or to sample flocs from within the mixing chamber 20. For example, the inspection platform 70 may be fixed to the location, or may be movable to the location.

[0036] Fig. 2 is a schematic explanatory diagram showing an example of the inspection stand 70 in this embodiment. Fig. 2 is an enlarged view of the vicinity of the inspection stand 70 in Fig. 1. Fig. 2A is a side view, and Fig. 2B is a plan view seen from above.

[0037] 2A, the inspection stand T may be configured with a bottom plate 71 having fences 72 on all four sides, and the bottom plate 71 may be disposed below the upper end of the mixing chamber 20. This ensures a working space for the worker A, and allows the worker A to easily perform visual inspection or sampling work inside the mixing chamber 20.

[0038] The shape and area of ​​the bottom plate 71 are not particularly limited as long as at least one worker A can carry out visual inspection or sampling operations. With regard to the area of ​​the bottom plate 71, from the standpoint of work efficiency and safety, it is preferable that the area be large enough to provide sufficient space for two or more workers A to work on the bottom plate 71 at the same time. The shape of the bottom plate 71 may be a polygon such as a square or a rectangle, or may be a shape having an arc that fits the outer periphery of the mixing chamber 20.

[0039] 2B, the fence 72 surrounding the bottom plate 71 may be open on the mixing chamber 20 side, or may be provided with a removable member 73 such as a chain or rope. This makes it possible to expand the working area in which the worker A can move freely while ensuring the safety of the worker A. In this case, in order to more reliably ensure the safety of the worker A, it is preferable to connect the worker A to the fence 72 with a safety belt (fall prevention device) or the like.

[0040] Moreover, it is preferable that the inspection stand 70 is disposed below the normal stand T and connected so that the worker A can freely move between the normal stand T and the inspection stand 70. This allows the worker A to smoothly move around to inspect the water treatment device 100A, thereby improving work efficiency. An example of the connection between the inspection platform 70 and the normal platform T is, for example, a ladder or other moving member between the inspection platform 70 and the normal platform T. Another example is a structure in which a part of the fence 72 of the normal platform T and the inspection platform 70 is connected as shown in FIG. 2A. This allows the worker A to descend from the normal platform T side to the bottom plate 71 side along the structure of the fence 72. In addition, there is no need to prepare or install a separate member for connecting the inspection platform 70 and the normal platform T, which can improve the movement efficiency of the worker A.

[0041] The horizontal arrangement of the inspection stand 70 and the mixing chamber 20 may be such that the worker A can perform visual inspection and sampling work. For example, it is preferable to arrange them so that the horizontal distance L between the end of the mixing chamber 20 and the end of the inspection stand 70 is within 0.5 m, and more preferably within 0.3 m. This allows the worker A to move to a position quite close to the mixing chamber 20, making it possible to easily proceed with work related to checking the inside of the mixing chamber 20.

[0042] As described above, in the water treatment device 100A of this embodiment, the inspection platform is provided for the coagulation chamber provided in the reaction tank so that the operator can move to a position where the coagulation state in the chamber can be confirmed, making it easy to directly check the coagulation state in the chamber. This makes it easy to inspect the state of floc formation. In addition, it becomes possible to efficiently adjust the operation of the water treatment device based on the inspection results.

[0043] [Second embodiment] FIG. 3 is a schematic explanatory diagram showing the structure of a water treatment device 100B according to a second embodiment of the present invention. As shown in Fig. 3, the water treatment device 100B according to this embodiment has a structure in which the distance L between the end of the mixing chamber 20 and the end of the bottom plate 71 of the inspection stand 70 is approximately zero. Note that Fig. 3 shows a structure in which the end of the bottom plate 71 of the inspection stand 70 is directly connected to the side wall 20b of the mixing chamber 20. Also, a description of the same configuration as that of the water treatment device 100A of the first embodiment will be omitted.

[0044] In this embodiment, the water treatment device 100B has a distance L between the end of the mixing chamber 20 and the end of the bottom plate 71 of the inspection stand 70 that is approximately zero, allowing worker A to more accurately and safely perform work related to checking and inspecting the state (flocculation state) of the treated water W in the mixing chamber 20.

[0045] Further, the specific structure in which the distance L between the end of the mixing chamber 20 and the end of the bottom plate 71 of the inspection stand 70 is approximately zero is not particularly limited. For example, as shown in FIG. 3, it is not limited to directly connecting the side wall 20b of the mixing chamber 20 and the bottom plate 71 of the inspection stand 70.

[0046] 4A and 4B are schematic explanatory diagrams showing an example of the structure of the mixing chamber 20 and the inspection stand 70 in this embodiment, in which Fig. 4A is a side view and Fig. 4B is a plan view seen from above.

[0047] As shown in FIG. 4, a connecting member 24 on which the worker A can put his / her feet is provided on the side wall 20b of the mixing chamber 20, and the connecting member 24 and the bottom plate 71 are brought close to each other, so that the distance L between the end of the mixing chamber 20 and the end of the bottom plate 71 of the inspection stand 70 is made approximately zero. As shown in FIG. 4, the respective configurations of the mixing chamber 20 side and the inspection stand 70 side are separated, and the distance L between them is made approximately zero, which has the advantage that the accuracy during the design and manufacture of the water treatment device 100B is not strictly required. Note that a plate-like member or the like may be provided to bridge the connecting member 24 on the mixing chamber 20 side and the bottom plate 71 of the inspection stand 70, so that the distance L between the mixing chamber 20 and the inspection stand 70 is made approximately zero, allowing the worker A to move safely to the mixing chamber 20 side.

[0048] By bringing the connecting member 24 and the bottom plate 71 close to each other and making the distance L between the end of the mixing chamber 20 and the end of the bottom plate 71 of the inspection stand 70 approximately zero, as shown in Figure 4A, worker A can move quite close to the mixing chamber 20 to check the state (flocculation state) of the treated water W in the mixing chamber 20, making it possible to improve the work efficiency and accuracy related to visual inspection or sampling inside the mixing chamber 20. At this time, as shown in Fig. 4B, by forming a part of the inspection platform 70 with a removable member 73, it becomes easy for the worker A to step up to the connecting member 24. At this time, it is preferable to take safety measures such as extending a part of the fence 72 to the mixing chamber 20 side or connecting the worker A to the fence 72 with a safety belt, so that the worker can carry out the work in a state where safety is further ensured.

[0049] As described above, the water treatment device 100B of the present embodiment allows the operator to work closer to the chamber, which enables the operator to check and inspect the state (aggregation state) of the water to be treated in the chamber more accurately and safely.

[0050] The above-described embodiment shows an example of a water treatment device. The water treatment device according to the present invention is not limited to the above-described embodiment, and the water treatment device according to the above-described embodiment may be modified within a range that does not change the gist of the device.

[0051] For example, the water treatment device in this embodiment is not limited to a coagulation sedimentation treatment device using a sedimentation tank equipped with a mixing chamber. The water treatment device may be any device having a reaction tank equipped with a chamber into which the water to be treated is introduced, and is not limited to the device described in this embodiment. Other examples include a coagulation sedimentation treatment device equipped with a coagulation sedimentation tank for forming a sludge blanket. An example of a coagulation sedimentation treatment device for forming a sludge blanket is a coagulation sedimentation treatment device having a coagulation sedimentation tank with a double structure made of an outer wall part and an inner wall part, a sludge blanket part forming a blanket-like floc growth zone in which flocs grow as the water to be treated to which a coagulant is added rises as a chamber, and a thickening part for thickening excess sludge generated in the sludge blanket part. By providing the inspection stand in this embodiment to such a water treatment device, it is possible to easily check and inspect the state (coagulation state) of the water to be treated in the chamber (sludge blanket part), and it is also possible to efficiently adjust the operation of the water treatment device based on the inspection results.

[0052] In addition, the water treatment device in this embodiment shows that the inspection platform is fixed and installed at one place, but is not limited thereto. For example, a plurality of inspection platforms may be installed. This allows the worker to check and inspect the inside of the chamber from a plurality of places. Also, the inspection platform may be provided with a mechanism that allows it to be raised and lowered. This allows the inspection platform and the worker to be lowered to a position where the inside of the chamber can be observed and inspected as necessary. In particular, in the water treatment device in this embodiment, when the water level of the clear layer on the outer periphery of the chamber suddenly rises above expectations, the inspection platform can be raised to prevent the inspection platform from being submerged. [Industrial Applicability]

[0053] The water treatment device of the present invention can be used as a water treatment device having a chamber in a reaction tank into which the water to be treated is introduced. As a more specific example, the water treatment device of the present invention can be suitably used for a coagulation sedimentation treatment in which a chamber in a reaction tank is provided for adding a coagulant to the water to be treated to form flocs. [Explanation of symbols]

[0054] 100A, 100B water treatment device, 1 reaction tank, 10 settling tank, 10a peripheral wall, 20 mixing chamber, 20a flow path, 20b side wall, 21 inlet pipe, 22 coagulant supply section, 22a coagulant addition nozzle, 23 rotary mixer, 24 connection member, 30 distributor, 30a discharge hole, 40 treated water discharge section, 50 sludge discharge section, 51 sludge extraction recess, 52 sludge extraction pipe, 53 scraper, 60 scraping section, 61 rotating shaft, 62 support rod, 63 scraping blade, 70 inspection stand, 71 bottom plate, 72 fence, 73 removable member, A worker, C clarified layer, F floc, L distance between chamber end and inspection stand end, M drive unit, P sediment, S shaft, T Normal stand, W untreated water, W1 treated water

Claims

1. a chamber disposed in the reaction tank and into which the water to be treated is introduced; A normal stand arranged so as to span the reaction vessel; and an inspection stand provided to enable an operator to move from an upper portion of the chamber to a position where the operator can check the condition of the water to be treated in the chamber.

2. The water treatment device according to claim 1 , wherein the inspection platform is disposed at a location where the operator can visually inspect and / or sample the inside of the chamber.

3. The bottom of the normal stand is provided above the upper end of the chamber, 3. The water treatment device according to claim 1, wherein a bottom of the inspection stand is provided below an upper end of the chamber.

4. The inspection stand is provided below the normal stand, 4. The water treatment device according to claim 3, wherein the normal stand and the inspection stand are connected to each other so that the worker can freely move between the normal stand and the inspection stand.

5. 5. The water treatment device according to claim 1, wherein a horizontal distance between the end of the chamber and the end of the inspection stand is within 0.5 m.

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