Wastewater collection device

Abstract

This wastewater collection device comprises: a water treatment system having a flocculation unit having a flocculation tank into which water to be treated is introduced, a turbidity removal unit for filtering the treated water that has been treated in the flocculation unit, and a reverse osmosis membrane treatment unit for subjecting the treated water that has been treated in the turbidity removal unit to desalination treatment; and a chemical liquid supply unit having two or more chemical liquid tanks for supplying a chemical liquid to the water treatment system, wherein the water treatment system is accommodated in containers A and B, the chemical liquid supply part is accommodated in container C, and the chemical liquid is supplied from the chemical liquid supply unit to the water treatment system by piping.

Description

Wastewater recovery equipment

[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.

[0002] A wastewater recovery system including a coagulation section, a turbidity removal membrane section, a reverse osmosis membrane treatment section, a chemical solution supply section, etc. is described in Patent Document 1. In Patent Document 1, water to be treated is subjected to coagulation treatment in a coagulation tank by adding an inorganic coagulant and an organic coagulant. 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.

[0003] Japanese Patent Application Laid-Open No. 2021-186760

[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 laborious construction of the system on site, which has tended to lengthen construction time 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.

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

[0007] [1] A wastewater recovery apparatus comprising: a water treatment system having a flocculation unit equipped with a flocculation tank into which water to be treated is introduced; a turbidity treatment unit that filters the treated water treated in the flocculation unit; and a reverse osmosis membrane treatment unit that desalinates the treated water treated in the turbidity treatment unit; and a chemical liquid supply unit having two or more chemical liquid tanks for supplying chemical liquid to the water treatment system, wherein the water treatment system is housed in one or two or more containers (A, B), the chemical liquid supply unit is housed in another container (C), and the chemical liquid is supplied from the chemical liquid supply unit to the water treatment system via piping.

[0008] [2] The wastewater recovery device according to [1], wherein openings for piping are provided on the side of the container (C) and on the side of the container (B) facing the side of the container (C), and the piping is inserted into the openings.

[0009] [3] The wastewater recovery apparatus according to [1], wherein the water treatment system has a container (B) accommodating the flocculation unit and a container (A) accommodating 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 provided 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 in the container (A).

[0013] [7] The wastewater recovery device according to [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] The wastewater recovery device of [3], wherein a first coagulation tank for coagulating raw water is installed outside the container (B) and close to the container (B), and piping for conducting chemicals from a chemical tank in the container (C) to the coagulation tank is arranged 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.

[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 system 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.

[0018] Fig. 1 is a perspective view of a wastewater recovery apparatus according to an embodiment immediately after being delivered to the site. Fig. 2 is a plan view of a wastewater recovery apparatus according to an embodiment. Fig. 3 is a left side view of container A. Fig. 4 is a right side view of container A. Fig. 5 is a flow configuration diagram of the wastewater recovery apparatus. Fig. 6 is an explanatory diagram of the arrangement of piping. Fig. 7 is an explanatory diagram of the arrangement of piping. Fig. 8 is a configuration diagram of the side walls of containers B and C. Fig. 9 is a perspective view of a wastewater recovery apparatus according to another embodiment immediately after being delivered to the site.

[0019] A wastewater recovery device according to an embodiment will be described below with reference to FIGS.

[0020] As shown in FIG. 1, the wastewater recovery system 1 has three containers A, B, and C and a first flocculation 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 side walls, a top surface, a bottom surface, and a pair of end surfaces, one or both of which is provided with an openable 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 with bolts or the like, and the number of tanks can be changed.

[0024] In this embodiment, the chemical tank 2 is a tank for NaClO, a tank for H ２ SO ４ tank for slime control agent (slurry control agent), tank for NaOH, tank for FeCl as inorganic coagulant ３ tank, NaHSO as a reducing agent ３The tanks installed include a tank for a coagulation aid, a tank for an organic coagulant (polymer coagulant), a tank for a scale dispersant, a tank for a membrane cleaning agent, etc. Tanks for other chemicals may also be installed.

[0025] As shown in Figures 6A and 6B, each tank 2 is provided with a chemical injection pump 5, and the chemical liquid discharged from the pump 5 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 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 solution is to be injected. When the chemical solution is to be supplied to two or more devices, the NaClO tank, the NaOH tank, and the H ２ SO ４ Like a tank for storing water, the piping on the pump discharge port side is branched into two or more tubes 3, and each tube 3 is provided with a valve 4.

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

[0028] The tube 3 leading to the first flocculation tank 1 is inserted through the leftmost openings 6, 7 in Fig. 7, and the tube 3 extending to container A is inserted through the rightmost openings 6, 7 in Fig. 7. The tube 3 connected to the second flocculation tank 12 and the third tank 13 in container B is inserted through the central openings 6, 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 FIG. 5, the first coagulation tank 1 receives raw water from a raw water pipe 1a and adds NaClO (a disinfectant), a coagulation aid, NaOH, H ２ SO ４ , FeCl ３A coagulant (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 and turbidity of the raw water are below the set values, the raw water is transferred to the drainage pipe 41 via the bypass line 1b.

[0031] A tube 3 for feeding 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 (FIG. 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 neutralize the charge of SS in the raw water and cause an adsorption reaction (coprecipitation reaction) onto the surface of iron hydroxide to form coagulated flocs. 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 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 a coagulation aid, an organic coagulant, and NaOH for pH adjustment can be added through the tubes 3. The third tank 13 is a relay tank that sends the coagulated water to the UF. The intake and output of raw water is controlled according to the water level in the 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] Within 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 A, a backwash 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 passed through 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 FIG. 3, a plurality of 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 device 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 25 is discharged through pipes 42 and 41 .

[0042] As shown in FIG. 2, a plurality of RO devices (RO membrane modules) 25 are installed in parallel, and while membrane separation treatment is being performed in some modules, other modules are being cleaned or replaced.

[0043] During backwashing of the UF unit 21, 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. Backwash wastewater that has permeated the UF membrane to the primary side is discharged into a wastewater tank 40 via piping 39. Chemical cleaning is also performed approximately once a day.

[0044] Scale dispersant, slime control agent, NaHSO for RO water supply ３ (reducing agent), pH adjusting agent H ２ SO ４In order to add these chemicals, each tube 3 connected to the tank 2 of the chemical solution in the container C is drawn from the container C through the openings 6 and 7 into the container B, and further drawn through the container B into the container A, with each end connected to a pipe 22.

[0045] During chemical cleaning of the UF device 21, the membrane cleaning agent liquid 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, and its end is 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 20, 22, 23, 34, and 35 are arranged between the containers A and B through these openings.

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

[0048] At a manufacturing factory for the wastewater recovery system, each device is assembled into the boxes that make up containers A, B, and C. In container A, the UF device 21, RO device 25, backwash water 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 such as an agitator and a pH meter is installed in the second coagulation tank 12. An ORP meter and the like is also installed in the third tank 13.

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

[0051] Also, the first coagulation tank 1 is fabricated. 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 device, pump, or tank to which they are connected, and are disposed inside the container A or B. In this case, the other end of the pipes is disposed 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 these. 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 20, 22, 23, 34, 35 are 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 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, treatment water tanks and water treatment equipment other than those described above may be used. Furthermore, chemical solutions other than those described above 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 levels as shown in Figure 8. In Figure 8, the upper first flocculation tank 1 is installed on a stand.

[0058] Although the present invention has been described in detail using specific embodiments, it will be apparent to those skilled in the art that various modifications can be made without departing from the spirit and scope of the present invention. This application is based on Japanese Patent Application No. 2024-045198, filed on March 21, 2024, and is incorporated by reference in its entirety.

[0059] A, B, C Container 1 First coagulation tank 2 Chemical tank 3 Chemical injection piping (tube) 5, 16 to 18 Pump 12 Second coagulation tank 13 Third tank 21 UF device 25 RO device 32 Backwash water tank 40 Drainage tank

Claims

1. A wastewater recovery apparatus comprising: a water treatment system having a flocculation section equipped with a flocculation tank into which water to be treated is introduced; a turbidity treatment section that filters the treated water treated in the flocculation section; and a reverse osmosis membrane treatment section that desalinates the treated water treated in the turbidity treatment section; and a chemical liquid supply section having two or more chemical liquid tanks for supplying chemical liquid to the water treatment system, wherein the water treatment system is housed in one or two or more containers (A, B), the chemical liquid supply section is housed in another container (C), and the chemical liquid is supplied from the chemical liquid supply section to the water treatment system via piping.

2. The wastewater recovery device of claim 1, wherein openings for piping are provided on the side of the container (C) and on the side of the container (B) facing the side of the container (C), and the piping is inserted into the openings.

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

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

6. A 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 within the container (A).

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

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

9. A wastewater recovery device according to any one of claims 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.

Images