JPWO2010084961A1 - Water treatment equipment - Google Patents

Abstract

Since the water treatment apparatus 1 is composed of blocks 2a to 2c in which water treatment units 8a to 8c are mounted (accommodated) in containers 7a to 7c that can be transported, the water treatment units 8a to 8c are assembled in advance to construct a construction site. The main structure of the water treatment device 1 can be easily constructed at the construction site. And since the water treatment part 8a-8c which implements water treatments, such as filtration of to-be-processed water, is comprised for every block 2a-2c, water treatment capability can be changed with the installation number of blocks 2a-2c. Thus, since the increase / decrease of the blocks 2a-2c which have the water treatment parts 8a-8c can be performed easily, the installation work and removal work in a construction site can be easily performed according to desired water treatment capacity. It becomes possible.

Description

  The present invention relates to a water treatment apparatus that filters treated water to generate treated water.

  2. Description of the Related Art Conventionally, a water treatment apparatus that generates treated water from raw water such as river water, lake water, or groundwater using a filtration membrane is known. For example, Patent Document 1 discloses a water treatment apparatus including a filtration membrane. In this type of water treatment equipment, the overall layout and standards are designed according to the target performance and site area, and when constructing the facility, materials and various parts are brought into the site site, It is common to assemble and complete them on site.

JP 2003-266071 A

However, in conventional water treatment equipment, it is necessary to install various facilities and tanks stably on the ground for each single device and to perform piping to connect them. The time required increases and the work burden is large. Also, when a water treatment device is not required, it is difficult to remove filtration membranes, tanks, piping, etc. For example, when curing is necessary because equipment may be lifted or damaged during transportation The removal work is not easy. Therefore, when constructing a water treatment apparatus having a desired water treatment capacity according to the increase or decrease of the water to be treated, there has been a problem that the installation work and the removal work cannot be easily performed. As a result, it was not easy to increase or decrease the installation area according to the requirements.
Moreover, in the conventional water treatment apparatus, the filtration process of all the filtration membrane modules and reverse osmosis membrane modules had to be stopped in the case of a driving | running trouble, and the problem that the supply of a stable treated water was impossible occurred.
In addition, when the conventional water treatment apparatus is washed, it is necessary to wash the entire modules in the apparatus, resulting in a problem that stable treatment water cannot be supplied.

  The present invention aims to solve the above-mentioned problems, facilitates installation work and removal work at the construction site according to the desired water treatment capacity, and the entire apparatus even in the case of operational troubles. It aims at providing the water treatment apparatus which can supply treated water stably, without stopping.

  The present invention relates to a water treatment apparatus for producing treated water by filtering treated water, and a base that can be transported and a water treatment unit that is mounted on the base and produces treated water by filtering treated water. The water treatment unit includes a filtration membrane module and a reverse osmosis membrane module, and a plurality of unit structures are installed at a construction site according to a desired water treatment capacity. To do.

In the present invention, since the water treatment unit is mounted on a transportable base, the main structure of the water treatment facility can be simplified by assembling the water treatment unit in advance and transporting it to the construction site. Can be built at the construction site. And since the water treatment part which performs water treatments, such as filtration of to-be-processed water, is provided for every unit structure, water treatment capability can be changed with the number of installation of a unit structure. Thus, for example, when the amount of treated water increases, the unit structure is transported to the construction site for additional installation, and when the amount of treated water decreases, the unit structure is installed at the construction site. Just remove it from. Further, by providing a plurality of unit structures, treated water can be stably supplied without stopping the entire unit structure including the filtration membrane module and the reverse osmosis membrane module in the event of an operation trouble.
In addition, it is not necessary to clean the entire modules in the apparatus, and the filtration operation can be continued with other unit structures while cleaning some unit structures, so that stable treated water can be supplied. Moreover, increase / decrease of the installation area according to a process request can be made easy.
As described above, since the unit structure having the water treatment section can be easily increased or decreased, the installation work and the removal work at the construction site can be easily performed according to the desired water treatment capacity.

In a water treatment apparatus having a plurality of unit structures, for example, as many transfer pumps, backwashing facilities, and instrumentation facilities are required as the number of unit structures, the installation area increases accordingly when the amount of water treatment increases. There is a case.
Then, the said subject was able to be solved by using the unit structure whose permeation | transmission processing capability is more than predetermined value. The permeate treatment capacity of each unit structure is preferably 20 m ³ / h or more, and more preferably 30 m ³ / h or more. 75 m ³ / h or less is preferable and 60 m ³ / h or less is more preferable in view of workability on a transportable base and ease of maintenance. In this way, it becomes possible to greatly increase the treatment capacity of the treated water compared to the conventional single-bed ion exchange resin tower, and if the amount of treated water is the same, the apparatus must be made more compact than before. Can do. Moreover, an area required for installation can be reduced as compared with the conventional water treatment apparatus. Since the water treatment apparatus is compact, it is suitable not only for a small-scale water treatment plant but also because it has a permeation treatment capacity of a predetermined value or more, it can be applied to a large-scale water treatment plant without increasing the number of installed units. In addition, it is known to install a water treatment device on a base that can be transported. However, many of them are used on a temporary basis, such as small-scale or temporary, and in large-scale and permanent use, it is common to install some or all of the water treatment equipment in a normal building. It was. However, according to the present invention, since the water treatment capacity per base area is high while being transportable, the number of transport bodies is small, and a large and permanent transportable base is provided without installing a building. Water treatment equipment can be provided.
Furthermore, the water treatment unit has a filtration membrane module and a reverse osmosis membrane module, and the treated water treated by the filtration membrane module is preferably supplied directly to the reverse osmosis membrane module via a high-pressure pump. . In this structure, since it has a filtration membrane module and a reverse osmosis membrane module, it becomes easy to aim at the improvement of the quality of treated water and space saving compared with sand filtration etc., for example. Further, since the clogging of the reverse osmosis membrane module can be suppressed by the filtration membrane module, stable operation can be achieved. Furthermore, since an intermediate tank or the like for temporarily storing treated water is not interposed between the filtration membrane module and the reverse osmosis membrane module, it is effective for space saving.

  Furthermore, it is preferable that the plurality of unit structures are installed in parallel on the construction site, and the flow paths of the water to be treated that pass through each unit structure are independent for each unit structure. The water treatment unit must stop operation for several minutes when the filtration membrane module is washed (backwashed). Therefore, with the above configuration, for example, by shifting the cleaning time of the filtration membrane module for each unit structure, even when the water treatment unit mounted on one unit structure stops operation, Water treatment units mounted on other unit structures can continue to operate. Therefore, it becomes possible to continuously supply treated water.

In addition, it is preferable that the plurality of unit structures are stacked in the vertical direction on the construction site, and the flow path of the water to be treated that passes through each unit structure is independent for each unit structure. In this way, even if the site line of the construction site is narrow, by stacking the unit structures vertically, the number of unit structures can be increased and the water treatment capacity per installation area can be increased. Can do.

  Further, the unit structure includes a concentrated water transfer pipe for transferring the concentrated water discharged from the reverse osmosis membrane module, and a backwash water transfer pipe connected to the outlet side of the filtration membrane module and sending backwash water to the filtration membrane module. Are connected to the concentrated water transfer pipes of each of the plurality of unit structures to collect the concentrated water, and are connected to the backwash water transfer pipes of each of the plurality of unit structures to collect the concentrated water. It is preferable to further include a concentrated water collecting line for supplying backwash water to at least one of the plurality of backwash water transfer pipes. The concentrated water discharged from the reverse osmosis membrane module is generally treated as waste water. However, since this concentrated water is treated water that has already been treated by the filtration membrane module, it can be used as backwash water for the filtration membrane module. According to the above configuration, since the concentrated water concentration line is provided, the concentrated water discharged from each reverse osmosis membrane module can be concentrated and used as backwash water for the filtration membrane module, so the concentrated water discharged from the reverse osmosis membrane module. Water can be used effectively, and it is not necessary to prepare a liquid for backwashing, which is effective in reducing costs.

  In the water treatment apparatus according to the present invention, it is preferable that all the filtrate of the filtration membrane module is supplied to the reverse osmosis membrane module. In this case, the treatment capacity of the treated water can be ensured.

  In the water treatment apparatus according to the present invention, it is preferable that the water treatment unit is housed in a transportable frame. As described above, when the water treatment unit is housed in the transportable frame, it is possible to suppress leakage of noise to the outside and to prevent damage to the water treatment unit due to ultraviolet rays. In addition, wind and rain countermeasures and improvement in the aesthetics of the device can be achieved.

  In the water treatment apparatus according to the present invention, it is preferable that a work path is provided in the transportable frame. In this case, maintenance during operation of the apparatus is simplified.

  In the water treatment apparatus according to the present invention, it is preferable that the filtration membrane module is installed in the transportable frame so that the total length of the filtration membrane module / the height inside the frame = 90% or less. In this case, since the filtration membrane module can be compactly installed in the frame without bending the header pipe, the overall size of the water treatment apparatus can be made compact. In addition, it is preferable that a filtration membrane module is installed with a filtration membrane module full length / frame internal height = 85% or less, and it is more preferable to install with 80% or less.

  In the water treatment apparatus according to the present invention, it is preferable to install the filtration membrane module in the transportable frame body in parallel to the height direction of the frame body, and to install the reverse osmosis membrane module perpendicular to the height direction of the frame body. It is. In this case, it is most suitable for downsizing as a method of densely filling the module while securing the work space of the frame.

  In the water treatment apparatus according to the present invention, it is preferable that both the valve unit of the filtration membrane module and the valve unit of the reverse osmosis membrane module are provided in a transportable frame. In this case, the filtration membrane module and the reverse osmosis membrane module can be directly connected via the high-pressure pump within a limited range. Here, the valve unit of the membrane filter module is, for example, raw water, backwash water, wash water, filtered water, raw water return, air, drainage flow path switching valve and / or flow control valve, pressure, flow rate, A unit with instrumentation that detects temperature. The valve unit of the reverse osmosis membrane module is, for example, a unit including a flow path switching valve and / or a flow rate control valve for each of raw water, permeated water, concentrated water, and wash water, and an instrument that detects pressure and flow rate To tell.

  In the water treatment apparatus according to the present invention, it is preferable to fix the filtration membrane module and / or the reverse osmosis membrane module using the inner wall of the transportable frame. In this case, it is easy to secure a work space for module replacement, yarn breakage inspection, and the like. Here, the “inner wall” includes a wall, ceiling, and floor inside the frame that can be transported.

  According to the present invention, installation work and removal work at a construction site can be easily performed according to a desired water treatment capacity.

It is a perspective view which shows the external appearance of the water treatment apparatus which concerns on embodiment of this invention. It is a perspective view which shows the internal structure of the block of a water treatment apparatus. It is a figure which shows typically arrangement | positioning of each block of a water treatment apparatus, and the flow direction of a liquid. It is a time chart which shows the timing of backwashing of each MF membrane module. It is a perspective view which shows the state which is conveying the block which comprises a water treatment apparatus. It is a schematic diagram which shows control of each block. It is a perspective view which shows the water treatment apparatus laminated | stacked on the upper and lower two steps.

  Preferred embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view showing an external appearance of a water treatment apparatus according to an embodiment of the present invention. FIG. 2 is a perspective view showing the internal configuration of the block of the water treatment apparatus, and FIG. 3 is a diagram schematically showing the arrangement of the blocks of the water treatment apparatus and the liquid flow direction.

  As shown in FIG. 1, the water treatment apparatus 1 according to the present embodiment is constructed by installing a plurality of blocks (unit structures) 2 a to 2 c and a unit block 3. The blocks 2a to 2c are arranged in parallel, and the unit block 3 is installed on the upstream side where the water to be treated flows with respect to the blocks 2a to 2c. One end side (upstream side to which the water to be treated is supplied) of each block 2a to 2c and the unit block 3 are communicated with each other via the transfer pipes 4a to 4c that transfer the water to be treated. Moreover, the transfer pipes 5a-5c which transfer from the other end side (downstream side where the secondary treated water is discharged) of each block 2a-2c and transfer the secondary treated water are integrated into one transfer pipe 6. Yes. That is, the flow path of the to-be-treated water that passes through each of the blocks 2a to 2c is independent for each of the blocks 2a to 2c. Each of the blocks 2a to 2c has an independent function of filtering the water to be treated to obtain secondary treated water (treated water).

  As shown in FIGS. 1 and 2, the blocks 2 a to 2 c include containers (frame bodies) 7 a to 7 c and water treatment units 8 a to 8 c installed in the containers 7 a to 7 c.

  The container 7a is a box-like one that is usually used for freight transportation, and is composed of a plate-like base 9a that becomes the bottom of the container 7a and a cover 10a that surrounds the base 9a in a rectangular parallelepiped shape by a wall structure. The total length of the container is about 6 m (20 feet). The container is provided with a heat insulating paint. A door 11 is attached to the cover 10a. The total length of the container may be about 12 m (40 feet).

  The containers 7b and 7c have the same configuration as the container 7a, and are composed of plate-like bases 9b and 9c that are the bottoms of the containers 7b and 7c, and covers 10b and 10c that surround the bases 9b and 9c in a rectangular parallelepiped shape with a wall structure. Has been.

  As shown in FIGS. 2 and 3, the water treatment units 8 a to 8 c include a plurality of MF membrane modules 12 a to 12 c incorporating MF (microfiltration) membranes and a plurality of RO incorporating RO (reverse osmosis) membranes. It has membrane modules 13a-13c.

  The water treatment unit 8a will be specifically described as an example. Among the plurality of MF membrane modules 12a, for example, one certain MF membrane module 12a is connected to a header pipe on the upstream side (treated water side) via a branch pipe, and also on the downstream side (primary treated water side). ) Is connected to the header pipe through a branch pipe. Similarly, the other MF membrane modules 12a are connected to the upstream (treated water side) and downstream (primary treated water side) header pipes via branch pipes. It constitutes a membrane unit. In addition, for example, one RO membrane module 13a among the plurality of RO membrane modules 13a is connected to a header pipe on the upstream side (primary treated water side) via a branch pipe, and also on the downstream side (secondary side). It is connected to the header pipe on the treated water side via a branch pipe. Similarly, the other RO membrane modules 13a are connected to the upstream side (primary treated water side) and downstream side (secondary treated water side) header pipes via branch pipes. The RO membrane unit is configured.

  The transfer pipe 15a is assembled so that the header pipe on the downstream side of the MF membrane module 12a and the header pipe on the upstream side of the RO membrane module 13a are connected in series via the high-pressure pump 14a. As a result, no intermediate tank is interposed between the MF membrane module 12a and the RO membrane module 13a, and the primary treated water discharged from the MF membrane module 12a is directly supplied to the RO membrane module 13a.

  The plurality of RO membrane modules 13a are connected to a header pipe for concentrated water. A concentrated water transfer pipe 19a for transferring concentrated water is assembled to the header pipe. The concentrated water transfer pipe 19a is bifurcated as shown in FIG. One of the concentrated water transfer pipes 19a is connected to a backwash water transfer pipe 20a assembled to the transfer pipe 15a via a concentrated water collecting line 21 described later. The backwash water transfer pipe 20a is a pipe for feeding backwash water (RO concentrated water) into the MF membrane module 12a. The backwash water transfer pipe 20a is provided with a pump 22a for pumping backwash water and a valve 23a for controlling the flow of backwash water with respect to the header pipe downstream of the MF membrane module 12a. . The other end of the concentrated water transfer pipe 19a is provided with a valve 24a that controls the discharge amount of the concentrated water, and discharges the concentrated water to a drain tank (not shown).

  Further, as shown in FIG. 3, an air transfer pipe 25a for transferring air scrubbing air is assembled to each branch pipe of the header pipe on the upstream side (the treated water side) of the MF membrane module 12a. . Further, a waste water transfer pipe 26a for transferring waste water containing contaminants (impurities) that have been peeled off from the membrane element during backwashing and accumulated in the region is assembled in the region upstream of the membrane element in the MF membrane module 12a. It has been. The wastewater transfer pipe 26a is provided with a valve 27a for controlling the discharge amount of the wastewater. Details of the air transfer pipe 25a will be described later.

  The water treatment units 8b and 8c have the same configuration as the water treatment unit 8a, and the header pipes downstream of the MF membrane modules 12b and 12c and the header pipes upstream of the RO membrane modules 13b and 13c include a high-pressure pump 14b, Transfer pipes 15b and 15c are assembled so as to be connected in series via 14c. As a result, the primary treated water discharged from the MF membrane modules 12b and 12c is directly removed from the RO membrane modules 13b and 12c without an intermediate tank interposed between the MF membrane modules 12b and 12c and the RO membrane modules 13b and 13c. 13c is supplied.

  The RO membrane modules 13b and 13c are connected to a header pipe for concentrated water, and concentrated water transfer pipes 19b and 19c for transferring concentrated water are assembled to the header pipe. One of the concentrated water transfer pipes 19b and 19c communicates with the backwash water transfer pipes 20b and 20c assembled so as to communicate with the transfer pipes 15b and 15c via the concentrated water collecting line 21. The backwash water transfer pipes 20b and 20c control the flow of backwash water and pumps 22b and 20c for pumping backwash water (RO concentrated water) to the header pipe downstream of the MF membrane module 12a. Valves 23b and 23c are provided. Further, the other of the concentrated water transfer pipes 19b and 19c is provided with valves 24b and 24c for controlling the discharge amount of the concentrated water.

  Further, as shown in FIG. 3, air branch pipes 25b and 25c for transferring air scrubbing air are provided in the branch pipes of the header pipes on the upstream side (treated water side) of the MF membrane modules 12b and 12c. It is assembled. Further, waste water transfer pipes 26b and 26c for transferring waste water containing contaminants that have been peeled off from the membrane element during backwashing and accumulated in the region in the upstream area of the membrane element in the MF membrane modules 12b and 12c. It is assembled. The waste water transfer pipes 26b and 26c are provided with valves 27b and 27c for controlling the discharge amount of the waste water.

  The block 2a includes a low pressure pump 16a for distributing water to the MF membrane module 12a, a valve 17a provided between the MF membrane module 12a and the high pressure pump 14a, a high pressure pump 14a, a low pressure pump 16a and a valve 17a. And a control panel 18a for controlling the driving of the motor. The low pressure pump 16a, the valve 17a, and the control panel 18a also constitute part of the water treatment unit 8a. A similar configuration is also provided in the blocks 2b and 2c, and the low-pressure pumps 16b and 16c, the valves 17a and 17b, and the control panels 18a and 18b also constitute part of the water treatment units 8b and 18c.

  Returning to FIG. 1, the water treatment apparatus 1 includes the concentrated water aggregation line 21 described above. The concentrated water collecting line 21 is connected to the concentrated liquid transfer pipes 19a to 19c and the backwash water transfer pipes 20a to 20c. Therefore, the concentrated liquid transfer pipes 19 a to 19 c and the backwash water transfer pipes 20 a to 20 c communicate with each other via the concentrated water collecting line 21. Specifically, the concentrated water transfer pipe 19a and the backwash water transfer pipe 20a communicate with the concentrated water collecting line 21 through the wall of the container. With the above configuration, the concentrated water discharged from each RO membrane module 13 a to 13 c is collected in the concentrated water collecting line 21. As a result, the concentrated water discharged from each RO membrane module 13a-13c can be used as backwash water for the MF membrane modules 12a-12c.

  Moreover, the unit block 3 is connected with each block 2a-2c via each transfer pipe 4a-4c as mentioned above. Specifically, the downstream side of a storage tank 36 (described later) shown in FIG. 3 and the upstream side of the unit block 3 are connected via a single transfer pipe 28 for transferring pretreated water. A transfer pipe 28 is branched into three transfer pipes 4a to 4c in the unit block 3 and connected to the blocks 2a to 2c. Further, as shown in FIG. 3, the unit block 3 includes an air pump 29 for sending compressed air, a chamber 30 for storing the compressed air sent from the air pump 29, and a decompression adjustment for the compressed air discharged from the chamber 30. And a pressure reducing valve 31 is provided. An air transfer pipe 25 d is assembled to the air pump 29, the chamber 30 and the pressure reducing valve 31.

  The air transfer pipe 25 d is branched into three air transfer pipes 25 a to 25 c in the unit block 3. The air transfer pipe 25 a is a pipe that connects each branch pipe of the header pipe on the downstream side of the MF membrane module 12 a of the block 2 a and the chamber 30. The air transfer pipe 25a is provided with a valve 32a for controlling the amount of air delivered. Although not shown in FIG. 1, the air transfer pipe 25a is assembled to the MF membrane module 12a through the wall of the container of each block 2a. In addition, the air transfer pipes 25b and 25c are provided with valves 32b and 32c for controlling the amount of air sent out in the same manner as the air transfer pipe 25a.

  Further, the unit block 3 is equipped with a central processing unit 33. The central processing unit 33 comprehensively manages the control panels 18a to 18c provided individually in the blocks 2a to 2c. That is, the central processing unit 33 corresponds to a master station, and the control panels 18a to 18c correspond to slave stations. The central processing unit 33 also controls valves 23a to 23c, 24a to 24c, 27a to 27c, 32a to 32c, 42a to 42c and pumps 22a to 22c, 29, 40, and 41 provided in the water treatment device 1. Centrally managed, control panels 18a to 18c, valves 23a to 23c, 24a to 24c, 27a to 27c, 32a to 32c, 42a to 42c and pumps 22a to 22c, 29, 40, 41 and one wiring (in FIG. 3) (Dotted line). Further, the central processing unit 33 acquires data for grasping the operation state such as a flow rate, temperature, pressure, or water level from a sensor or the like (not shown), and performs control based on the acquired data. Create an optimal operating environment.

  Next, water treatment by the water treatment apparatus 1 will be described along the treatment flow with reference to FIG. In addition, in this embodiment, since the case where boiler water is produced | generated as treated water is demonstrated to an example, raw | natural water turns into tap water. 3, in addition to the plurality of blocks 2a to 2c, the unit block 3, and the concentrated water concentration line 21, the water treatment apparatus 1 removes impurities in the raw water tank 34 that stores raw water to be treated water and raw water. Activated carbon pretreatment tower 35, a storage tank 36 for storing activated carbon-treated pretreatment water, a storage tank 37 for storing secondary treated water treated by the RO membrane modules 13 a to 13 c, and a storage tank 37. An ion-exchange resin tower 38 that makes the next treated water pure water and a pure water tank 39 that stores pure water are installed. A pump 40 that pumps raw water is provided between the raw water tank 35 and the activated carbon pretreatment tower 36, and a pump 41 that pumps first treated water is provided between the storage tank 37 and the ion exchange resin tower 38. Hereinafter, the water treatment will be specifically described by taking the block 2a as an example.

  As shown in FIG. 3, the raw water is first pumped from the raw water tank 34 by the pump 40 to the activated carbon pretreatment tower 35, and the pretreated water that has passed through the activated carbon pretreatment tower 35 is stored in the storage tank 36. In the block 2a, when the valve 42a of the transfer pipe 4a is opened, the low-pressure pump 16a is driven to pump up the pretreated water from the storage tank 36 and pump it at low pressure to the head pipe upstream of the MF membrane module 12a. .

  Next, the primary treated water that has passed through the MF membrane module 12a is discharged toward the high-pressure pump 14a from the header pipe on the downstream side of the MF membrane module 12a, and the header pipe on the upstream side of the RO membrane module 13a by this high-pressure pump 14a. Until high pressure of 1.0 to 1.5 MPa. The secondary treated water that has passed through the RO membrane module 13a of the block 2a is collected and stored in the storage tank 37 via the transfer pipe 5a and the transfer pipe 6. Thereafter, the secondary treated water is pumped from the storage tank 37 to the ion exchange resin tower 38 by the pump 41, and the pure water that has passed through the ion exchange resin tower 38 is stored in the pure water tank 39. The pure water stored in the pure water tank 39 has an electric conductivity of, for example, 10 μS / cm. As described above, water treatment is performed in the block 2a. Also in the blocks 2b and 2c, water treatment is performed by the same procedure as the block 2a.

  Next, backwashing of the MF membrane modules 12a to 12c will be described with reference to FIG. The backwashing of the MF membrane modules 12a to 12c is performed to remove impurities that are adsorbed or deposited on the surface of the MF membrane and increase the filtration resistance of the MF membrane. Below, backwashing is demonstrated concretely taking the MF membrane module 12a in the block 2a as an example.

  First, all the valves 24a to 24c provided on the drain outlet side of each concentrated water transfer pipe 19a to 19c and the valve 17a provided to the transfer pipe 15a are closed, and a valve 23a provided to the backwash water transfer pipe 20a. Is released. Next, the concentrated water concentrated in the concentrated water collecting line 21 from the RO membrane modules 13b and 13c by closing the valves 24a to 24c is concentrated and sent to the transfer pipe 15a by the pump 22a. At this time, since the valve 23a is opened and the valve 17a is closed, the concentrated water is fed into each MF membrane module 12a from the downstream header pipe.

Simultaneously with the concentrated water, by opening the valve 32a, air is sent from the chamber 30 to the branch pipe of the header pipe upstream of the MF membrane module 12a through the air transfer pipe 25a for about 1 minute. Impurities adsorbed on the surface of the MF membrane are peeled off by backwashing with concentrated water and scrubbing with air bubbles. Here, the air pressure in the chamber 30 is set to about 7 Kgf / cm ² by the air pump 29, and the air released from the chamber 30 is adjusted and decompressed by the decompression valve 31. It is sent to the module 12a at about ² Kgf / cm ² .

  After sending concentrated water and air to the MF membrane module 12a, the valve 32a is closed to stop sending air from the chamber 30, and the valve 27a of the transfer pipe 26a assembled to the MF membrane module 12a is opened. Furthermore, the pretreatment water from the transfer pipe 4a is fed in for about 1 minute. Thereby, the peeled impurities are discharged from the MF membrane module 12a to the outside. As described above, the MF membrane module 12a is backwashed. The MF membrane modules 12b and 12c are also backwashed in the same procedure.

  Here, in this embodiment, the time for backwashing the MF membrane modules 12a to 12c is shifted for each block. FIG. 4 is a time chart showing the timing of backwashing the MF membrane modules 12a to 12c. As shown in the figure, each of the MF membrane modules 12a to 12c equipped in each of the blocks 2a to 2c is backwashed at a cycle of 30 minutes.

  Specifically, as shown in FIG. 4C, for example, in the MF membrane module 12a of the block 2a, cleaning with concentrated water and air (AS / BW) is performed for 1 minute, and then the discharge of impurities by the concentrated water (F ) Is performed for 1 minute, as shown in FIG. 4B, backwashing of the MF membrane module 12b of the block 2b is similarly performed after 8 minutes. Then, after 8 minutes, as shown in FIG. 4A, the MF membrane module 12c of the block 2c is back-washed. By repeating this process, each MF membrane module 12a to 12c is backwashed in a cycle of 30 minutes.

  Next, the construction method of the water treatment apparatus 1 will be described. When the water treatment apparatus 1 is constructed in the site of the construction site, the blocks 2a to 2c are manufactured in advance at a factory away from the site. As shown in FIG. 5, the blocks 2 a to 2 c are transported to the site by transport means 43 such as a truck after completion.

  As shown in FIG. 1, the blocks 2 a to 2 c are installed on the ground at the construction site. The number of blocks 2a to 2c to be installed is appropriately changed according to a desired water treatment capacity (amount of water to be treated). Each of the blocks 2a to 2c is arranged in parallel with a predetermined space. At this time, each block 2a-2c is installed so that a longitudinal direction may turn into the same direction.

  The unit block 3 is installed with its longitudinal direction facing in a direction perpendicular to each block, and a predetermined space is formed between the unit block 3 and each of the blocks 2a to 2c. The blocks 2a to 2c and the unit block 3 are arranged as described above.

  When the blocks 2a to 2c and the unit block 3 are installed and fixed simultaneously, or after the installation is completed, the transfer pipes 4a to 4c and the concentrated water collecting line 21 are connected to the blocks 2a to 2c and the unit block 3, respectively. Is done. Further, the unit block 3 and the storage tank 36 are connected by a transfer pipe 28, and the blocks 2 a to 2 c and the storage tank 37 are connected by a transfer pipe 6. As described above, the water treatment apparatus 1 shown in FIG. 1 is constructed.

  Hereinafter, the block-by-block control will be specifically described using the block 2a as an example. In addition, since control of the blocks 2b and 2c is the same as that of the block 2a, redundant description is omitted.

  FIG. 6 is a schematic diagram showing control of each block. As shown in FIG. 6, between the MF membrane module 12a and the high pressure pump 14a, a flow meter 44a for measuring the flow rate of the primary treated water flowing in the transfer pipe 15a, and the pressure on the suction side of the high pressure pump 14a And a pressure sensor 45a for detecting. The flow meter 44 a and the pressure sensor 45 a are connected to the central processing unit 33 and transmit each measured data to the central processing unit 33.

  Further, an RO permeate flow meter 46a for measuring the flow rate of the permeated water (secondary treated water) flowing from the RO membrane module 13a is installed behind the RO membrane module 13a. Further, a valve 24a for controlling the amount of concentrated water discharged is directly connected to the RO membrane module 13a. The RO permeate flow meter 46 a is connected to the central processing unit 33 and transmits measured data to the central processing unit 33. The low-pressure pump 16a, the high-pressure pump 14a, and the valve 24a are connected to the central processing unit 33, and receive each control signal from the central processing unit 33 to execute each operation.

  In the block 2a configured as described above, MF-RO direct connection control such as flow rate control, pressure control, and flow rate control is performed. Specifically, first, the flow meter 44 a measures the flow rate of MF filtered water (primary treated water) and outputs the signal to the central processing device 33. The central processing unit 33 performs PID (Proportional Integral Derivative) calculation based on the data measured by the flow meter 44a and outputs the result. In addition, as PID calculation, output calculation is mentioned by the deviation with a setting value, for example. Subsequently, the central processing unit 33 performs inverter frequency control for the low-pressure pump 16a based on the output of the PID calculation. Thereby, the motor rotation speed control of the low-pressure pump 16a is executed, and the supply amount to the MF membrane module 12a varies.

  The pressure sensor 45 a detects the pressure on the suction side of the high-pressure pump 14 a and outputs the pressure signal to the central processing unit 33. The central processing unit 33 performs PID calculation based on the pressure signal on the suction side of the high-pressure pump 14a and outputs the result. Subsequently, the central processing unit 33 performs inverter frequency control for the high-pressure pump 14a based on the output of the PID calculation. Thereby, the motor rotation speed control of the high-pressure pump 14a is executed, and the discharge amount of the high-pressure pump 14a varies.

  The RO permeate flow meter 46a measures the RO permeate flow rate and outputs the measurement signal to the central processing unit 33. The central processing unit 33 performs a PID calculation based on the RO permeate flow rate signal and outputs the result. Subsequently, the central processing unit 33 controls the valve 24a based on the output of the PID calculation. Therefore, the amount of RO concentrated water varies. Along with this, the RO permeate amount varies.

For example, when the set value of the amount of MF filtered water is 25 m ³ / h and the set value of the suction pressure of the high-pressure pump 14 a is 5 m, the discharge amount of the high-pressure pump 14 a is 25 m ³ / h. And when RO permeated-water amount setting value is 20 m < ³ > / h, RO concentrated water amount is balancing at 5 m < ³ > / h.

When the suction pressure setting value water column 5m of the high pressure pump 14a is stable, the pushing flow rate from the MF membrane module 12a and the drawing flow rate of the high pressure pump 14a are balanced. In this case, the discharge amount of the high-pressure pump 14a is 25 m ³ / h which is the same as the supply amount to the MF membrane module 12a. Thereafter, the valve 24a is operated to distribute the RO permeated water amount 20 m ³ / h and the RO concentrated water amount 5 m ³ / h.

When the MF membrane differential pressure increases, the rotational speed of the low pressure pump 16a increases to maintain the MF filtered water amount set value 25 m ³ / h, and when the RO membrane differential pressure increases, the high pressure The rotation speed of the pump 14a is increased and the RO permeated water amount set value 20m ³ / h (RO concentrated water amount 5m ³ / h) is maintained. Therefore, the suction pressure set value water column 5m of the high-pressure pump 14a (that is, the state in which the pushing flow rate and the drawing flow rate of the high-pressure pump 14a are balanced) is continuously stabilized. As a result, stable operation of the block 2a can be realized.

As mentioned above, according to the water treatment apparatus 1, since it becomes the blocks 2a-2c by which the water treatment parts 8a-8c were mounted (accommodated) in the containers 7a-7c which can be conveyed, the water treatment parts 8a-8c are set beforehand. By assembling and transporting to the construction site, the main structure of the water treatment device 1 can be easily constructed at the construction site. And since the water treatment part 8a-8c which implements water treatments, such as filtration of to-be-processed water, is comprised for every block 2a-2c, water treatment capability can be changed with the installation number of blocks 2a-2c. Thereby, for example, when the amount of treated water increases, blocks 2a to 2c are transported to the construction site and additionally installed. When the amount of treated water decreases, blocks 2a to 2c are replaced. Remove from the construction site. Thus, since the increase / decrease of the blocks 2a-2c which have the water treatment parts 8a-8c can be performed easily, installation work and removal work in a construction site can be easily performed according to desired water treatment capacity. It becomes possible.

In addition, in a water treatment apparatus having a plurality of unit structures such as blocks, for example, transfer pumps, backwashing equipment, instrumentation equipment, etc. are required as many as the number of unit structures. The installation area may also increase.
Then, the said subject was able to be solved by using the blocks 2a-2c whose transparency processing capability is more than predetermined value. The permeate treatment capacity of each of the blocks 2a to 2c is preferably 20 m ³ / h or more, and more preferably 30 m ³ / h or more. 75 m < ³ > / h or less is preferable and 60 m < ³ > / h or less is more preferable from the workability | operativity on the bases 9a-9c which can be conveyed, and the ease of a maintenance. In this way, it becomes possible to greatly increase the treatment capacity of the treated water compared to the conventional single-bed ion exchange resin tower, and if the amount of treated water is the same, the apparatus must be made more compact than before. Can do. Moreover, an area required for installation can be reduced as compared with the conventional water treatment apparatus. Since the water treatment apparatus 1 is compact, it is suitable not only for a small-scale water treatment plant, but also because it has a permeation treatment capacity of a predetermined value or more, it can be applied to a large-scale water treatment plant without increasing the number of installed units. In addition, it is known to install a water treatment device on a base that can be transported. However, many of them are used on a temporary basis, such as small-scale or temporary, and in large-scale and permanent use, it is common to install some or all of the water treatment equipment in a normal building. It was. However, according to the water treatment apparatus 1 according to the present embodiment, since the water treatment capacity per area of the bases 9a to 9c is high while being transportable, the number of transport bodies is small and large without installing a building. A water treatment apparatus having a base that can be transported on a scale can be provided.

  Moreover, the water treatment parts 8a-8c have MF membrane modules 12a-12c and RO membrane modules 13a-13c, and the primary treated water treated by the MF membrane modules 12a-12c is the high-pressure pumps 14a-14c. It is configured to be supplied directly to the RO membrane modules 13a to 13c via the. As a result, the MF membrane modules 12a to 12c and the RO membrane modules 13a to 13c make it easier to improve the quality of treated water and save space compared to, for example, sand filtration. Further, since the clogging of the RO membrane modules 13a to 13c can be suppressed by the MF membrane modules 12a to 12c, stable operation can be achieved. Further, since an intermediate tank or the like for temporarily storing the primary treated water is not interposed between the MF membrane modules 12a to 12c and the RO membrane modules 13a to 13c, it is effective for space saving.

  Moreover, the several blocks 2a-2c are installed in parallel at the construction site, and the flow path of the to-be-processed water which passes each block 2a-2c is each independent for each block 2a-2c. The water treatment units 8a to 8c must stop operation for several minutes when the MF membrane modules 12a to 12c are washed (backwashed). Therefore, the above-described configuration is adopted, for example, when the cleaning time of the MF membrane modules 12a to 12c is shifted for each of the blocks 2a to 2c, so that the water treatment unit 8a mounted on the block 2a stops operation. However, the water treatment units 8b and 8c mounted on the blocks 2b and 2c can continue operation. Therefore, it becomes possible to continuously supply treated water. Furthermore, when the water treatment unit 8a of the block 2a is backwashed, the operation pressure of each pump of the water treatment units 8b and 8c mounted on the water treatment units 2b and 2c is increased to continuously reduce the treatment amount. It is also possible to ensure the same processing amount.

  The blocks 2a to 2c are connected to the concentrated water transfer pipes 19a to 19c for transferring the concentrated water discharged from the RO membrane modules 13a to 13c, and the outlet sides of the MF membrane modules 12a to 12c. The backwash water transfer pipes 20a to 20c for feeding backwash water to 12c are provided. Then, the concentrated water is connected to the concentrated water transfer pipes 19a to 19c of each of the plurality of blocks 2a to 2c to collect the concentrated water, and is connected to and integrated with the backwash water transfer pipes 20a to 20c of each of the plurality of blocks 2a to 2c. The concentrated water collecting line 21 for supplying the concentrated water as backwash water to at least one of the plurality of backwash water transfer pipes 20a to 20c is provided. The concentrated water discharged from the RO membrane modules 13a to 13c is generally treated as waste water. However, since this concentrated water is treated water that has already been treated by the MF membrane modules 12a to 12c, it can be used as backwash water for the MF membrane modules 12a to 12c. According to the above configuration, since the concentrated water concentration line 21 is provided, the concentrated water discharged from each RO membrane module 13a to 13c can be aggregated and used as backwash water for the MF membrane modules 12a to 12c. Concentrated water discharged from 13a to 13c can be used effectively, and it is not necessary to prepare a liquid for backwashing, which is effective for cost reduction.

  Moreover, in the conventional water treatment apparatus, the MF membrane module and the RO membrane module are individually designed as a series, and when adjusting the increase / decrease in the treatment capacity, each of the MF membrane module and the RO membrane module is designed. Since it is necessary to change the film area and layout, it is difficult to easily change the processing capability. On the other hand, in the water treatment apparatus 1 according to the present embodiment, the MF membrane modules 12a to 12c and the RO membrane modules 13a to 13c are integrally controlled in the blocks 2a to 2c. Therefore, it is only necessary to change the design according to the number of blocks 2a to 2c. Therefore, the processing (filtration) capacity can be increased or decreased by simply changing the number of blocks 2a to 2c installed at the construction site.

  Moreover, since the MF membrane modules 12a to 12c and the RO membrane modules 13a to 13c are integrally controlled and managed for each block 2a to 2c as described above, the management items are limited, and each block 2a to 2c is controlled. 2c membrane cleaning, membrane replacement, capacity reduction cause estimation, membrane lifetime prediction, and preventive maintenance of equipment are facilitated.

  Moreover, since each block 2a-2c is the same design construction, it is easy to standardize the emergency response and maintenance work management items, such as a film capacity fall and a film breakage, and an efficient driving | operation is attained.

  Further, for example, when the processing capacity of one block is reduced, it is only necessary to replace only one block of the plurality of blocks with reduced processing capacity with a new block, so that the processing capacity can be easily recovered. it can. In addition, it is possible to carry out efficient film cleaning while transporting a block with reduced processing capacity to a dedicated cleaning factory and confirming recovery of the processing capacity.

  Furthermore, since the blocks 2a to 2c are provided with containers 7a to 7c having walls, the water treatment section (MF membrane module 12a) in the blocks 2a to 2c at the time of lifting work at the time of replacement of the blocks 2a to 2c or at the time of transportation. -12c and RO membrane modules 13a-13c, etc.) can be prevented from being damaged. Therefore, the MF membrane modules 12a to 12c having export restrictions and management restrictions can be safely transported.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, tap water is exemplified as raw water for the production of boiler water, but the present invention may be used for treating factory waste water and domestic sewage. It becomes domestic sewage.

  Moreover, in the said embodiment, although the water treatment part 8a-8c which has MF membrane module 12a-12c and RO membrane module 13a-13c is equipped in block 2a-2c, it is in the back | latter stage of RO membrane module 13a-13c. Furthermore, an RO membrane module may be provided. That is, the RO membrane unit may be configured in multiple stages. In this case, the water quality can be further improved.

  Moreover, in the said embodiment, although each block 2a-2c is arranged in parallel, the blocks 2a-2c may be piled up and down. For example, as shown in FIG. 7, the blocks 2 a to 2 c that are arranged side by side are stacked in the vertical direction on the construction site and are in two upper and lower stages. The flow paths of the water to be treated passing through the upper and lower two-stage blocks 2a to 2c are independent for each of the blocks 2a to 2c. In this case, even if the site line of the construction site is narrow, the water treatment capacity per installation area can be increased by increasing the number of blocks 2a to 2c. In addition, when it laminates | stacks in a perpendicular direction, it is good also as not only the above-mentioned 2 steps | paragraphs but 3 steps | paragraphs and other multi-stages as needed.

  Moreover, in the said embodiment, although the concentrated water from RO membrane module 13a-13c discharged | emitted from each block 2a-2c is aggregated and utilized for the backwashing of MF membrane module 12a-12c, block 2a-2c A part of the primary treated water may be stored in the backwash chamber every time, and the inside of the backwash chamber may be pressurized and the primary treated water in the backwash chamber may be used for backwashing the MF membrane modules 12a to 12c. In addition to the microfiltration membrane, an ultrafiltration membrane is also used as the filtration membrane.

1 Water treatment device 2a-2c Block (unit structure)
8a-8c Water treatment part 9a-9c Base 12a-12c MF membrane module (microfiltration membrane module)
13a-13c RO membrane module (reverse osmosis membrane module)
14 High-pressure pumps 19a to 19c Concentrated water transfer pipe 20a to 20c Backwash water transfer pipe 21 Concentrated water collecting line.

Claims (13)

In a water treatment apparatus for producing treated water by filtering the treated water,
A unit structure comprising a transportable base and a water treatment unit mounted on the base to produce the treated water by filtering the treated water;
The water treatment unit includes a filtration membrane module and a reverse osmosis membrane module,
A plurality of unit structures are installed at a construction site according to a desired water treatment capacity. The water treatment apparatus according to claim 1, wherein the permeated water treatment capacity of each of the unit structures is 20 m ³ / h or more.   The water treatment apparatus according to claim 1 or 2, wherein the treated water treated by the filtration membrane module is directly supplied to the reverse osmosis membrane module via a high-pressure pump. The plurality of unit structures are installed in parallel at the construction site,
The water treatment apparatus according to any one of claims 1 to 3, wherein the flow path of the water to be treated that passes through each unit structure is independent for each unit structure. The plurality of unit structures are stacked vertically in the construction site,
The water treatment apparatus according to claim 1 or 2, wherein the flow path of the water to be treated that passes through each unit structure is independent for each unit structure. The unit structure is connected to a concentrated water transfer pipe for transferring concentrated water discharged from the reverse osmosis membrane module, and an outlet side of the filtration membrane module, and backwash water for feeding backwash water to the filtration membrane module A transfer pipe,
The concentrated water is connected to the concentrated water transfer pipes of each of the plurality of unit structures, and the concentrated water is connected to the backwash water transfer pipes of the plurality of unit structures. The water treatment apparatus according to claim 3, further comprising a concentrated water collecting line that supplies at least one of the plurality of backwash water transfer pipes as backwash water.   The water treatment apparatus according to any one of claims 1 to 6, wherein all of the filtrate of the filtration membrane module is supplied to the reverse osmosis membrane module.   The water treatment apparatus according to any one of claims 1 to 7, wherein the water treatment unit is housed in a transportable frame.   The water treatment apparatus according to claim 8, wherein a work passage is provided in the transportable frame.   The water treatment device according to claim 8 or 9, wherein the filtration membrane module is installed in the transportable frame so that the total length of the filtration membrane module / the height inside the frame = 90% or less.   The said filtration membrane module in the said frame which can be conveyed is installed in parallel with the height direction of a frame, and the said reverse osmosis membrane module is installed perpendicularly | vertically with the height direction of a frame. The water treatment apparatus according to item.   The water treatment apparatus according to any one of claims 8 to 11, wherein both the valve unit of the filtration membrane module and the valve unit of the reverse osmosis membrane module are provided in the transportable frame.   The water treatment apparatus according to any one of claims 8 to 12, wherein the filtration membrane module and / or the reverse osmosis membrane module is fixed using an inner wall of the transportable frame.

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