Drainage recovery device

Abstract

Provided is a drainage recovery device that enables easy loading and unloading at a construction site and construction work at the site. 【Solution means】A water treatment system having a coagulation unit including a coagulation tank into which treated water is introduced, a turbidity removal unit that filters the treated water treated in the coagulation unit, and a reverse osmosis membrane treatment unit that performs desalination treatment on the treated water treated in the turbidity removal unit, and a chemical supply unit having two or more chemical tanks for supplying chemicals to the water treatment system, the drainage recovery device being provided with: the water treatment system is housed in containers A and B, the chemical supply unit is stored in a container C, and chemicals are supplied from the chemical supply unit to the water treatment system through pipes.

Description

Technical Field

[0001] The present invention relates to a drainage recovery device, and particularly to a drainage recovery device provided with a coagulation section, a turbidity removal membrane section, a reverse osmosis membrane treatment section, a chemical solution supply section, and the like.

Background Art

[0002] There is a drainage recovery device described in Patent Document 1 that includes a coagulation section, a turbidity removal membrane section, a reverse osmosis membrane treatment section, a chemical solution supply section, and the like. In Patent Document 1, the water to be treated is subjected to coagulation treatment by adding an inorganic coagulant and an organic coagulant in a coagulation tank. The coagulation treatment liquid is subjected to turbidity removal treatment by a UF membrane device, and then subjected to reverse osmosis treatment by a reverse osmosis membrane device (hereinafter sometimes referred to as an RO device) to become treated water.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Conventionally, drainage recovery devices are designed according to the properties and quantity of the water to be treated, etc. for each site. Each device constituting the drainage recovery device is individually carried into the site and connected by piping. Therefore, it has been time-consuming to construct the device at the site, the construction period has been long, and the cost has been high.

[0005] An object of the present invention is to provide a drainage recovery device that is easy to carry in and out of the construction site and to construct at the site.

Means for Solving the Problems

[0006] The drainage recovery device of the present invention is as follows.

[0007] [1] A coagulation section including a coagulation tank into which the water to be treated is introduced, A turbidity removal treatment unit that filters the treated water processed by the agglomeration unit, and A reverse osmosis membrane treatment unit that desalinizes the treated water processed by the turbidity removal treatment unit A water treatment system having, A chemical solution supply unit having two or more chemical solution tanks for supplying a chemical solution to the water treatment system, and A drainage recovery device comprising: The water treatment system is housed in one or two or more containers (A, B), and the chemical solution supply unit is housed in a separate container (C), A drainage recovery device in which a chemical solution is supplied from the chemical solution supply unit to the water treatment system through a pipe.

[0008] [2] Openings for inserting a pipe are provided on the side surface of the container (C) and on the side surface of the container (B) facing the side surface of the container (C), respectively, The drainage recovery device of [1] in which the pipe is inserted through the opening.

[0009] [3] The water treatment system has a container (B) housing the agglomeration unit and a container (A) housing the treatment unit and the reverse osmosis membrane treatment unit of [1]. Turbid area The drainage recovery device of [1].

[0010] [4] In the container (B), a pump for feeding liquid to the treatment unit and a pump for feeding liquid to the reverse osmosis membrane treatment unit are installed in the drainage recovery device of [3]. Turbid area The drainage recovery device of [3].

[0011] [5] The chemical solution tank is detachably provided in the container (C) in the drainage recovery device of [1].

[0012] [6] In the container (A), a reverse wash water tank for storing reverse wash water supplied to the treatment unit is installed in the drainage recovery device of [4]. Turbid area The drainage recovery device of [4].

[0013] [7] In the container (B), the reverse wash water in the reverse wash water tank is removed from the Turbid areaA drainage recovery device [6] equipped with a backwash pump for sending water to the treatment section.

[0014] [8] Outside the container (B), a first flocculation tank for flocculating raw water is installed in proximity to the container (B), A drainage recovery device [3] in which a pipe for guiding a chemical solution from the chemical solution tank in the container (C) to the flocculation tank is arranged passing through the inside of the container (B).

[0015] [9] Each of the containers (A, B, C) is a rectangular box shape that is long in one direction, and is arranged in parallel with their longitudinal directions parallel to each other in any of the drainage recovery devices [1] to [8].

Advantages of the Invention

[0016] According to the present invention, since each device is housed in a container, a drainage recovery device is constructed by bringing the container equipped with the device to the site and connecting the respective devices together by piping. Therefore, the carrying-in work and the construction work of the drainage recovery device at the site are easy, the construction period is shortened, and various costs are reduced.

[0017] When the drainage recovery device of the present invention becomes unnecessary, the piping can be removed, and the container can be easily removed and carried out from the site as a whole. In addition, it is also possible to carry the removed container to another site and reuse it.

Brief Description of the Drawings

[0018]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6A

Figure 6B

Figure 7

Figure 8

Mode for Carrying Out the Invention

[0019] Hereinafter, the drainage recovery device according to the embodiment will be described with reference to FIGS. 1 to 8.

[0020] As shown in FIG. 1, this drainage recovery device 1 has three containers A, B, and C and a first coagulation tank 1.

[0021] Containers A, B, and C are rectangular boxes (cuboid-shaped boxes) that are long in one direction and are installed with their longitudinal directions parallel to each other. In this embodiment, container B is arranged between containers A and C.

[0022] Containers A, B, and C have a pair of longitudinal side surfaces, a top surface, a bottom surface, and a pair of end surfaces. Openable doors are provided on one or both end surfaces.

[0023] A plurality of chemical liquid tanks 2 for storing chemical liquids are arranged in container C. Each chemical liquid tank 2 is detachably attached to container C, and the number of tanks can be changed.

[0024] In this embodiment, as the chemical liquid tanks 2, as shown in FIG. 5, a tank for NaClO, a tank for H2SO4, a tank for a slime control agent (slacon agent), a tank for NaOH, a tank for FeCl3 as an inorganic coagulant, a tank for NaHSO3 as a reducing agent, a tank for a coagulation aid, a tank for an organic flocculant (a high molecular flocculant), a tank for a scale dispersant, a tank for a membrane cleaning agent, etc. are installed. In addition, chemical agent tanks other than these may be installed.

[0025] As shown in FIGS. 6A and 6B, each tank 2 is provided with a chemical injection pump 5, and the chemical solution discharged from the pump can be supplied to each device through a pipe (in this embodiment, a PFA tube 3).

[0026] When the chemical solution discharged from the pump 5 is supplied to only one device, one end of a tube 3 is connected to the discharge port of the pump 5, and the other end of the tube 3 extends to the device to be injected with the chemical. When supplying the chemical solution to two or more devices, as in the NaClO tank, NaOH tank, and H2SO4 tank in FIG. 6, the pipe on the pump discharge port side is branched into two or more tubes 3, and a valve 4 is provided in each tube 3.

[0027] As shown in FIG. 7, on the side wall of the container C on the side of the container B and on the side wall of the container B on the side of the container C, three openings 6 and 7 for inserting the tube 3 are provided so as to face each other.

[0028] In the left openings 6 and 7 in FIG. 7, a tube 3 leading to the first flocculation tank 1 is inserted, and in the right openings 6 and 7, a tube 3 extending to the container A is inserted. In the central openings 6 and 7, a tube 3 connected to the second flocculation tank 12 and the third tank 13 in the container B is inserted.

[0029] A synthetic resin pipe 8 is installed between the openings 6 and 7. Each tube 3 is inserted into the pipe 8.

[0030] As shown in FIG. 5, the first flocculation tank 1 receives raw water from the raw water pipe 1a, and NaClO (disinfectant), flocculation aid, NaOH, H2SO4, and FeCl3 (flocculant) can be added through each tube 3. The raw water pipe 1a is provided with measuring means for measuring the flow rate, conductivity, and turbidity of the raw water. When the conductivity or turbidity of the raw water is below the set value conditions, it is switched to the bypass line 1b and transferred to the drainage pipe 41.

[0031] The tube 3 for chemical injection into the first flocculation tank 1 is drawn into the container B through the openings 6 and 7, drawn out of the container B through the opening 10 (Figure 1) on one end face of the container B, and connected to the first flocculation tank 1.

[0032] In the first flocculation tank 1, an inorganic flocculant is injected to form flocculent flocs through the charge neutralization reaction of SS in raw water and the adsorption reaction (coprecipitation reaction) on the surface of iron hydroxide. Also, NaClO (sodium hypochlorite) is injected as necessary.

[0033] As shown in Figures 2 and 5, the second flocculation tank 12 and the third tank 13 are connected in the container B. The flocculated liquid from the first flocculation tank 1 flows into the second flocculation tank 12 through the transfer pipe 11, and the flocculated liquid in the second flocculation tank 12 Slot flows into the third tank 13 through the transfer pipe 14.

[0034] A pH meter is provided in the second flocculation tank 12, and an organic coagulant and NaOH for pH adjustment can be added through each tube 3. The third tank 13 is a relay for sending the flocculated water to the UF. Slot According to the water level of this third tank 13, the acceptance and stop of raw water are carried out. Also, an ORP (oxidation-reduction potentiometer) is provided in the third tank 13, and the injection control of NaClO (sodium hypochlorite) is carried out in conjunction with the ORP value.

[0035] In the container B, a pump 16 for sending the flocculated liquid in the third tank 13 to the UF device (ultrafiltration membrane device) 21 in the container, a pump 17 for backwashing the UF device 21, and a high-pressure pump 18 for boosting the RO feed water are installed. A In the container A, an RO device (reverse osmosis membrane device) 25, a UF device 21, a backwash water tank 32 for storing the backwash water of the UF device 21, a drain tank 40, etc. are installed.

[0036]

[0037] ​The agglomerated liquid from the third tank 13 is pumped by pump 16 and piped 20 to the UF device 21. The permeated water that has passed through the UF membrane is supplied to the RO device 25 through pipe 22, pump 18, and pipe 23. Note that a part of the UF permeated water can be introduced into the backwash water tank 32 through pipe 26 branched from pipe 22 and on-off valve 27.

[0038] As shown in Figure 3, a plurality of UF devices (UF membrane modules) 21 are installed in parallel. While some modules are performing membrane filtration of the agglomerated liquid, other modules are backwashed and put on standby.

[0039] The concentrated water of the UF device 21 flows into the drain tank 40 through pipe 39 and is discharged through pipe 41.

[0040] RO device 25 The permeated water is taken out as treated water through pipe 28. Note that a part of this RO permeated water can be introduced into the backwash water tank 32 through pipe 29 branched from pipe 28 and on-off valve 30.

[0041] The concentrated water of the RO device 26 is discharged through pipes 42 and 41.

[0042] RO device (RO membrane module) 25 As shown in Figure 2, multiple units are also installed in parallel. While some modules are performing membrane separation, other modules are cleaned or replaced.

[0043] During backwashing of the UF device, the water in the backwash water tank 32 is supplied to the secondary side (permeated water chamber) of the UF device 21 through pipe 34, pump 17, and pipe 35. The backwash drainage that has permeated through the UF membrane to the primary side is discharged to the drain tank 40 through pipe 39. Also, chemical cleaning is performed at a frequency of about once a day.

[0044] To add a scale dispersant, a slime control agent, NaHSO3 (a reducing agent), and H2SO4 for pH adjustment to the RO feed water, each tube 3 connected to the tank 2 of these chemical solutions in the container C is drawn into the container B through the openings 6 and 7 from the container C, and further drawn into the container A through the container B, and each end is connected to the pipe 22.

[0045] Still, during chemical cleaning of the UF device 21, the membrane cleaning agent solution in the membrane cleaning agent tank in the container C is added to the pipe 34 through the tube 3. This membrane cleaning agent tube 3 is also drawn into the container B through the openings 6 and 7 from the container C, and further drawn into the container A through the container B, and each end is connected to the pipe 34.

[0046] Although not shown in the figure, openings are also provided on the facing side surfaces of the containers A and B in the same manner as the openings 6 and 7, and the pipes 22, 23, 34, and 35 are arranged between the containers A and B through these openings.

[0047] [Construction Method of Drainage Recovery Device] Next, the construction method of this drainage recovery device will be described.

[0048] In the manufacturing factory of the drainage recovery device, each device is incorporated into the box bodies constituting the containers A, B, and C. In the container A, the UF device 21, the RO device 25, the backwash water tank 32, and the drainage tank 40 are installed and connected to each other by pipes.

[0049] In the container B, the second coagulation tank 12, the third tank 13, and the pumps 16 to 18 are installed, and the tanks 12 and 13 are connected by the pipe 14. Instrumentation devices such as stirrers and pH meters are attached to the second coagulation tank 12. ORP meters and the like are also attached to the third tank 13.

[0050] In the container C, each tank 2 and the pump 5 are installed, and one end of each tube 3 of a required length is connected to the discharge side of the pump 5. The other end of each tube 3 is arranged so as to face the opening 6.

[0051] Also, the first agitating tank 1 is fabricated. Instrumentation devices such as a stirrer and a pH meter are attached to the first agitating tank 1.

[0052] Regarding the pipes 20, 22, 23, 34, 35, one ends of them are connected to the pumps or tanks to which they are continuous and are arranged in the container A or B. At this time, the other ends of the pipes are arranged so as to face the openings on the side surfaces of the container A or B.

[0053] In addition, a control panel is installed in any one of the containers, for example, container B, and one end of the harness for the equipment to be controlled or the instrumentation device is connected to the control panel. Among the harnesses, the other ends of those for the pumps 16 to 18 and the instrumentation devices in the container B are connected to them. For the other ends of the other harnesses, they are arranged near the openings on the side surface (or end surface) of the container.

[0054] Each of the containers A to C and the first agitating tank 1 is carried into the site by a truck or the like and installed so as to be in the arrangement state shown in FIG. 1. Then, the first agitating tank 1 and the second agitating tank 12 are connected by the pipe 11, and the other ends of the chemical injection tubes 3 corresponding to the respective tanks 1, 12, 13 and the pipes 22, 34 are connected. Further, the other ends of the pipes 22, 23, 34, 35 are connected to predetermined pumps or tanks. Furthermore, the other ends of the respective harnesses are connected to the equipment to be controlled and the instrumentation devices.

[0055] Thereby, the installation of the drainage recovery device is completed.

[0056] This drainage recovery device is easy to carry into the site and assemble on site. Also, when the drainage recovery device becomes unnecessary, the pipes and harnesses between the containers are removed, and the containers A to C and the first agitating tank 1 are carried out respectively, so the removal work is also easy.

[0057] The above-described embodiment is an example of the present invention, and the present invention may be in other forms than the above. For example, treatment water tanks and water treatment equipment other than the above may be used. Also, chemical solutions other than the above may be used. Further, when providing a plurality of series of containers A, B, and C, they may be provided in parallel in units of A, B, and C, or each container may be stacked in two or more stages in the vertical direction as shown in FIG. 8. In FIG. 8, the first flocculation tank 1 is installed on a gantry.

Explanation of Reference Numerals

[0058] Containers A, B, and C 1 First flocculation tank 2 Chemical solution tank 3 Chemical injection pipe (tube) 5, 16 - 18 Pumps 12 Second flocculation tank 13 Third tank 21 UF device 25 RO device 32 Backwash water tank 40 Drainage tank

Claims

1. a flocculation section including a flocculation tank into which the water to be treated is introduced; A turbidity removal treatment unit that filters the treated water treated in the flocculation unit; and A reverse osmosis membrane treatment section that desalinates the treated water that has been treated in the turbidity treatment section. A water treatment system having a chemical supply unit having two or more chemical tanks for supplying chemicals to the water treatment system; A wastewater recovery device comprising: The water treatment system is housed in one or more containers (A, B), and the chemical liquid supply unit is housed in another container (C); a wastewater recovery device in which the chemical solution is supplied from the chemical solution supply unit to the water treatment system through a pipe; an opening for inserting a pipe is provided in a side surface of the container (C) and in a side surface of the container (B) facing the side surface of the container (C); The drainage recovery device has the piping inserted through the opening.

2. A flocculation section including a flocculation tank into which the water to be treated is introduced; A turbidity removal treatment unit that filters the treated water treated in the flocculation unit; and A reverse osmosis membrane treatment section that desalinates the treated water that has been treated in the turbidity treatment section. A water treatment system having a chemical supply unit having two or more chemical tanks for supplying chemicals to the water treatment system; A wastewater recovery device comprising: The water treatment system is housed in one or more containers (A, B), and the chemical liquid supply unit is housed in another container (C); a wastewater recovery device in which the chemical solution is supplied from the chemical solution supply unit to the water treatment system through a pipe; The water treatment system is a wastewater recovery apparatus having a container (B) accommodating the flocculation section, and a container (A) accommodating the turbidity treatment section and the reverse osmosis membrane treatment section.

3. 3. The wastewater recovery apparatus according to claim 2, further comprising a pump for sending liquid to the clarification treatment section and a pump for sending liquid to the reverse osmosis membrane treatment section, disposed in the container (B). 。

4. 4. The wastewater recovery apparatus according to claim 3, further comprising a backwash water tank disposed within said container (A) for storing backwash water to be supplied to said clarification treatment section.

5. The wastewater recovery apparatus according to claim 4, further comprising a backwash pump disposed in said container (B) for supplying the backwash water in said backwash water tank to said clarification treatment section.

6. A first coagulation tank for coagulating raw water is installed outside the container (B) and adjacent to the container (B).

3. The wastewater recovery system according to claim 2, wherein a pipe for conducting the chemical solution from a chemical solution tank in said container (C) to said coagulation tank is disposed through said container (B).

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