Wastewater recovery device

Abstract

To provide a wastewater recovery device that can easily be carried out of / carried into a construction site and can easily be constructed at the construction site.SOLUTION: There is provided a wastewater recovery device comprising a water treatment system comprising a flocculation unit comprising a flocculation tank into which water to be treated is introduced, a turbidity removal unit filtering the treated water treated in the flocculation unit, and a reverse osmosis membrane treatment unit desalinating the water treated in the turbidity removal unit, and a chemical solution feed unit comprising two or more chemical solution tanks for feeding a chemical solution to the water treatment system, with the water treatment system being housed in containers A and B, the chemical solution feed unit being housed in a container C, and the chemical solution being fed from the chemical solution feed unit to the water treatment system through a pipe.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a wastewater recovery system, and more particularly to a wastewater recovery system including a flocculation section, a turbidity removal membrane section, a reverse osmosis membrane treatment section, a chemical solution supply section, and the like. [Background technology]

[0002] Patent Document 1 describes a wastewater recovery system equipped with a coagulation section, a turbidity removal membrane section, a reverse osmosis membrane treatment section, a chemical solution supply section, etc. In Patent Document 1, water to be treated is subjected to coagulation treatment in a coagulation tank by adding inorganic and organic coagulants. The coagulated liquid is subjected to turbidity removal treatment in a UF membrane device, and then subjected to reverse osmosis treatment in a reverse osmosis membrane device (hereinafter sometimes referred to as an RO device) to produce treated water. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent Publication No. 2021-186760 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventionally, wastewater reclamation systems have been designed for each site according to the characteristics and volume of the water to be treated. Each component of the system is individually delivered to the site and connected by piping. This has resulted in time-consuming on-site construction, which has tended to lengthen construction times and increase costs.

[0005] An object of the present invention is to provide a wastewater recovery device that can be easily transported to and from a construction site and easily constructed on site. [Means for solving the problem]

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

[0007] [1] A flocculation unit having a flocculation tank into which the water to be treated is introduced; a clarification treatment unit that filters the treated water treated in the flocculation unit; and a reverse osmosis membrane treatment section for desalination of the treated water treated in the clarification 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 solution supply unit is housed in another container (C), The chemical solution is supplied from the chemical solution supply unit to the water treatment system through a pipe in the wastewater recovery device.

[0008] [2] An opening for inserting a pipe is provided on a side surface of the container (C) and on a side surface of the container (B) facing the side surface of the container (C), The drainage recovery device [1], wherein the piping is inserted into the opening.

[0009] [3] The wastewater recovery device according to [1], wherein the water treatment system comprises a container (B) containing the flocculation unit and a container (A) containing the turbidity removal membrane treatment unit and the reverse osmosis membrane treatment unit.

[0010] [4] The wastewater recovery device according to [3], wherein a pump for sending liquid to the turbidity removal membrane treatment section and a pump for sending liquid to the reverse osmosis membrane treatment section are installed in the container (B).

[0011] [5] The wastewater recovery device according to [1], wherein the chemical tank is detachably mounted on the container (C).

[0012] [6] The wastewater recovery device according to [4], wherein a backwash water tank for storing backwash water to be supplied to the turbidity removal membrane treatment unit is installed within the container (A).

[0013] [7] The wastewater recovery device of [6], wherein a backwash pump is installed in the container (B) for sending the backwash water in the backwash water tank to the turbidity removal membrane treatment unit.

[0014] [8] A first coagulation tank for coagulating raw water is installed outside the container (B) and adjacent to the container (B), The wastewater recovery device of [3], wherein a pipe for conducting the chemical solution from the chemical solution tank in the container (C) to the coagulation tank is arranged passing through the container (B).

[0015] [9] The wastewater recovery device according to any one of [1] to [8], wherein each of the containers (A, B, C) is a rectangular box that is long in one direction and is arranged in parallel with its longitudinal direction parallel to each other. [Effects of the Invention]

[0016] According to the present invention, since each device is housed in a container, the container equipped with the devices is delivered to the site and the wastewater recovery system is constructed by connecting the required devices to each other through piping. This simplifies the delivery work and the on-site construction work of the wastewater recovery system, shortens the construction period, and reduces various costs.

[0017] When the wastewater recovery device of the present invention is no longer needed, the piping can be disconnected and the container can be easily removed and transported from the site.The removed container can also be transported to another site and reused. [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 2 is a perspective view of the wastewater recovery device according to the embodiment immediately after being delivered to the site. [Figure 2] 1 is a plan view of a wastewater recovery device according to an embodiment. [Figure 3] FIG. 1 is a left side view of container A. [Figure 4] FIG. 1 is a right side view of container A. [Figure 5] FIG. 2 is a flow diagram of the wastewater recovery device. [Figure 6A] FIG. [Figure 6B] FIG. [Figure 7]This is a structural diagram of the side walls of containers B and C. [Figure 8] FIG. 10 is a perspective view of a wastewater recovery device according to another embodiment immediately after being delivered to a site. DETAILED DESCRIPTION OF THE INVENTION

[0019] Hereinafter, a wastewater recovery device according to an embodiment will be described with reference to FIGS.

[0020] As shown in FIG. 1, this wastewater recovery system 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 placed between containers A and C.

[0022] Each of the containers A, B, and C has a pair of longitudinal sides, a top surface, a bottom surface, and a pair of end surfaces, and one or both of the end surfaces is provided with an openable and closable door.

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

[0024] In this embodiment, as shown in Fig. 5, the chemical tanks 2 include a tank for NaClO, a tank for H2SO4, a tank for slime control agent (slurcon agent), a tank for NaOH, a tank for FeCl3 as an inorganic flocculant, a tank for NaHSO3 as a reducing agent, a tank for flocculation aid, a tank for organic coagulant (polymer flocculant), a tank for scale dispersant, a tank for membrane cleaning agent, etc. Chemical tanks other than these may also be installed.

[0025] As shown in Figures 6A and 6B, each tank 2 is equipped with a chemical injection pump 5, and the chemical liquid discharged from the pump can be supplied to each device through piping (in this embodiment, PFA tubes 3).

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

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

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

[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 Figure 5, the first coagulation tank 1 receives raw water from a raw water pipe 1a, to which NaClO (bactericide), coagulation aid, NaOH, H2SO4, and FeCl3 (coagulants) can be added via tubes 3. The raw water pipe 1a is provided with measuring means for measuring the flow rate, conductivity, and turbidity of the raw water, and when the conductivity or turbidity of the raw water is below the set value conditions, the bypass line 1b is used to transfer the raw water to a drainage pipe 41.

[0031] A tube 3 for supplying chemicals to the first coagulation tank 1 is drawn into the container B through openings 6 and 7, and is drawn out of the container B through an opening 10 (Figure 1) on one end face of the container B, and is connected to the first coagulation tank 1.

[0032] In the first coagulation tank 1, an inorganic coagulant is injected to form coagulated flocs through a charge neutralization reaction of SS in the raw water and an adsorption reaction (coprecipitation reaction) onto the surface of iron hydroxide. NaClO (sodium hypochlorite) is also injected as needed.

[0033] 2 and 5, a second coagulation tank 12 and a third tank 13 are connected to the inside of the container B. The flocculation liquid from the first coagulation tank 1 flows into the second coagulation tank 12 through a transfer pipe 11, and the flocculation liquid in the second coagulation tank 12 flows into the third tank 13 through a transfer pipe 14.

[0034] The second coagulation tank 12 is equipped with a pH meter, and an organic coagulant and NaOH for pH adjustment can be added through each tube 3. The third tank 13 is a relay tank that sends the coagulated water to the UF. The intake and cessation of raw water is controlled according to the water level in this third tank 13. The third tank 13 is also equipped with an ORP (oxidation-reduction potential meter), and the injection of NaClO (sodium hypochlorite) is controlled in conjunction with the ORP value.

[0035] Inside container B, there are installed a pump 16 for sending the flocculated liquid in the third tank 13 to a UF device (ultrafiltration membrane device) 21 in container C, a pump 17 for backwashing the UF device 21, and a high-pressure pump 18 for pressurizing the RO feedwater.

[0036] In the container A, an RO device (reverse osmosis membrane device) 25, a UF device 21, a backwash water tank 32 for storing backwash water for the UF device 21, a drainage tank 40, etc. are installed.

[0037] The flocculated liquid from the third tank 13 is sent to a UF unit 21 by a pump 16 and a pipe 20. The permeated water that has permeated the UF membrane is supplied to an RO unit 25 through a pipe 22, a pump 18, and a pipe 23. A portion of the UF permeated water can be introduced into a backwash water tank 32 via a pipe 26 branched from the pipe 22 and an on-off valve 27.

[0038] As shown in Figure 3, multiple UF devices (UF membrane modules) 21 are installed in parallel, and while some modules are performing membrane filtration of the flocculated liquid, other modules are backwashed and placed in a standby state.

[0039] The concentrated water from the UF unit 21 flows into a wastewater tank 40 through a pipe 39 and is discharged through a pipe 41 .

[0040] The permeated water from the RO device 26 is taken out as treated water through a pipe 28. A portion of this RO permeated water can be introduced into a backwash water tank 32 via a pipe 29 branched from the pipe 28 and an on-off valve 30.

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

[0042] As shown in FIG. 2, a plurality of RO devices (RO membrane modules) 26 are installed in parallel, and while membrane separation treatment is being performed in some modules, the other modules are cleaned or replaced.

[0043] During backwashing of the UF unit, water in the backwash water tank 32 is supplied to the secondary side (permeate chamber) of the UF unit 21 through piping 34, pump 17, and piping 35. The backwash wastewater that has permeated the UF membrane to the primary side is discharged via piping 39 to a wastewater tank 40. Chemical cleaning is also performed approximately once a day.

[0044] In order to add scale dispersant, slime control agent, NaHSO3 (reducing agent), and H2SO4 for pH adjustment to the RO water supply, each tube 3 connected to the tank 2 for these chemical solutions in container C is drawn from container C through openings 6 and 7 into container B, and then passed through container B and drawn into container A, with each end connected to piping 22.

[0045] 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 piping 34 via the tube 3. This membrane cleaning agent tube 3 is also drawn from the container C through the openings 6 and 7 into the container B, and further passes through the container B into the container A, with each end connected to the piping 34.

[0046] Although not shown, openings similar to the openings 6 and 7 are provided on the opposing sides of the containers A and B, and the pipes 22, 23, 34, and 35 are arranged between the containers A and B through these openings.

[0047] [Method for constructing a wastewater recovery device] Next, a method for constructing this wastewater recovery device will be described.

[0048] At the wastewater recovery system manufacturing factory, each device is assembled into the boxes that make up containers A, B, and C. In container A, the UF unit 21, RO unit 25, backwash tank 32, and wastewater tank 40 are installed and connected to each other with piping.

[0049] In container B, a second coagulation tank 12, a third tank 13, and pumps 16 to 18 are installed, and the tanks 12 and 13 are connected by piping 14. Instrumentation devices such as an agitator and a pH meter are attached to the second coagulation tank 12. An ORP meter and the like are also attached to the third tank 13.

[0050] In the container C, each tank 2 and 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 positioned so as to face the opening 6.

[0051] Also, a first coagulation tank 1 is prepared. The first coagulation tank 1 is equipped with instrumentation devices such as a stirrer and a pH meter.

[0052] The pipes 20, 22, 23, 34, and 35 are connected at one end to the pump or tank to which they are connected and placed inside the container A or B. In this case, the other end of the pipes is placed so as to face the opening on the side surface of the container A or B.

[0053] A control panel is installed in one of the containers, for example, container B, and one end of the harness for the controlled equipment or instrumentation equipment is connected to the control panel. The other ends of the harnesses for the pumps 16 to 18 and instrumentation equipment in container B are connected to them. The other ends of the other harnesses are placed near the openings on the side (or end) of the container.

[0054] Each of the containers A to C and the first coagulation tank 1 are transported to the site by truck or the like and set up in the arrangement shown in Figure 1. The first coagulation tank 1 and the second coagulation tank 12 are then connected by piping 11, and the other ends of the corresponding chemical injection tubes 3 are connected to each of the tanks 1, 12, 13 and piping 22, 34. The other ends of the piping 22, 23, 34, 35 are then connected to the appropriate pumps or tanks. The other ends of the harnesses are then connected to the equipment to be controlled and the instrumentation equipment.

[0055] This completes the installation of the wastewater recovery device.

[0056] This wastewater recovery system can be easily transported to the site and assembled on site. Furthermore, when the wastewater recovery system is no longer needed, removal is also easy because the piping and harnesses between the containers can be disconnected and the containers A to C and the first flocculation tank 1 can be carried out separately.

[0057] The above embodiment is one example of the present invention, and the present invention may be embodied in other forms. For example, other treated water tanks and water treatment equipment may be used. Also, other chemical solutions may be used. Furthermore, when multiple series of containers A, B, and C are provided, they may be provided in parallel in units of A, B, and C, or the containers may be stacked vertically in two or more layers as shown in Figure 8. In Figure 8, the first flocculation tank 1 is installed on a stand. [Explanation of symbols]

[0058] A, B, C containers 1 1st coagulation tank 2 Chemical tanks 3 Chemical injection piping (tubing) 5,16~18 Pump 12 Second flocculation tank 13 Tank 3 21 UF equipment 25 RO equipment 32 Backwash tank 40 Drain tank

Claims

1. a flocculation unit including a flocculation tank into which the water to be treated is introduced; a clarification treatment unit that filters the treated water treated in the flocculation unit; and a reverse osmosis membrane treatment section for desalination of the treated water treated in the clarification 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 solution supply unit is housed in another container (C), The chemical solution is supplied from the chemical solution supply unit to the water treatment system through a pipe in the wastewater recovery device.

2. 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); 2. The wastewater recovery device according to claim 1, wherein the piping is inserted through the opening.

3. 2. The wastewater recovery apparatus according to claim 1, wherein the water treatment system comprises a container (B) accommodating the flocculation section, and a container (A) accommodating the turbidity removal membrane treatment section and the reverse osmosis membrane treatment section.

4. 4. The wastewater recovery apparatus according to claim 3, wherein a pump for sending liquid to the turbidity removal membrane treatment section and a pump for sending liquid to the reverse osmosis membrane treatment section are installed in the container (B).

5. 2. The wastewater recovery device according to claim 1, wherein the chemical tank is detachably mounted on the container (C).

6. 5. The wastewater recovery system according to claim 4, wherein a backwash water tank for storing backwash water to be supplied to the turbidity removal membrane treatment section is installed in the container (A).

7. 7. The wastewater recovery apparatus according to claim 6, wherein a backwash pump is installed in the container (B) for sending the backwash water in the backwash water tank to the turbidity removal membrane treatment section.

8. A first coagulation tank for coagulating raw water is installed outside the container (B) and adjacent to the container (B), 4. The wastewater recovery system according to claim 3, wherein a pipe for conducting the chemical solution from the chemical solution tank in said container (C) to said coagulation tank is arranged through said container (B).

9. 9. The wastewater recovery device according to claim 1, wherein each of the containers (A, B, C) is a rectangular box that is long in one direction and is arranged in parallel with its longitudinal direction parallel to each other.

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