JP6447098B2 - Recovery filtration unit and water treatment system with recovery filtration unit - Google Patents

Description

  The present invention relates to a recovery filtration unit that recovers and filters water and a water treatment system including the same.

  Some conventional filtration units for wastewater treatment perform membrane separation activated sludge treatment (membrane bioreactor (MBR) treatment) (for example, Patent Document 1).

  The filtration unit of Patent Document 1 flows organic waste water 50, which is raw water, in the order of biological treatment tank 1, separation membrane 2 (microfiltration membrane module or ultrafiltration membrane module), membrane permeation water tank 6, and reverse osmosis membrane 3. To obtain reclaimed water.

JP 2008-73622 A

  In general factories and the like, wastewater treatment facilities for treating wastewater are often already installed. In recent years, it has been required to reuse the treated water treated by such existing wastewater treatment equipment more efficiently. When applying a filtration unit like patent document 1 to a factory etc., it can be said that there is still room for improvement in terms of enabling efficient reuse of such treated water.

  Therefore, the objective of this invention is providing the collection | recovery filtration unit which can reuse the treated water in the existing waste water treatment facility more efficiently, and a water treatment system provided with the same.

  In order to achieve the above object, the present invention is configured as follows.

  According to one aspect of the present invention, water is connected to an existing wastewater treatment facility that biologically treats organic wastewater to obtain primary treated water, and the primary treated water of the wastewater treatment facility is collected and filtered, and filtered water. Is a recovery filtration unit that supplies water as production water, and a membrane treatment is performed by separating the primary treated water recovered from the wastewater treatment facility with a filtration membrane to obtain secondary treated water, and a secondary treatment of the filtration membrane device A reverse osmosis membrane device for separating water with a reverse osmosis membrane to obtain permeated water and concentrated water as tertiary treated water, and producing permeated water as tertiary treated water obtained by the reverse osmosis membrane device While supplying as irrigation water, the concentrated water as the tertiary treatment water obtained by the reverse osmosis membrane device is supplied as the reverse cleaning water for the filter medium in the filtration device installed in the treatment system outside the unit. Rinse the filter medium after backwashing the resulting secondary treated water Supplied as water, to provide a recovered filtration unit.

  According to the recovery filtration unit of the present invention and the water treatment system including the same, the treated water in the existing wastewater treatment facility can be reused more efficiently.

The schematic block diagram of the water treatment system concerning embodiment of this invention

(Knowledge that became the basis of the present invention)
As a result of intensive studies to solve the conventional problems, the present inventors have found the following findings.

  As a result of considering the conventional filtration unit, the present inventors have found that when the filtration unit described in Patent Document 1 is newly applied to a factory or the like, it is necessary to newly install all the above-described configurations as they are. Pay attention. Therefore, the present inventors additionally use a configuration of the existing equipment as it is, and additionally provide a predetermined collection filtration unit having a necessary configuration for the existing equipment, thereby efficiently operating the filtration unit. Found that can be done. Based on the above findings, the present inventors have conceived the following invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, this invention is not limited by this embodiment.

(Embodiment)
FIG. 1 shows a schematic configuration of a water treatment system including a recovery filtration unit according to an embodiment of the present invention. A water treatment system 1 shown in FIG. 1 is a system for treating water used in a factory or the like. The water treatment system 1 includes a wastewater treatment facility 2, a recovery filtration unit 3, and a production water preparation facility 4.

  The wastewater treatment facility 2 is a facility for biologically treating organic wastewater (raw water W0) generated in a factory or the like to obtain a primary treated water W1 or for discharging sewage. The wastewater treatment facility 2 is provided as an existing facility already installed in a factory or the like that includes the water treatment system 1.

  The recovery filtration unit 3 collects and filters the primary treated water W1 obtained in the wastewater treatment facility 2, and manufactures the filtered water (permeated water W3a) to other factory facilities in the factory equipped with the water treatment system 1. This unit supplies water. The recovery filtration unit 3 functions as a production water supply facility (first production water supply facility) that supplies such production water. The recovery filtration unit 3 is additionally connected to the existing wastewater treatment facility 2 and the production water preparation facility 4. The recovery filtration unit 3 is connected to the production water preparation facility 4 to produce various treated waters (secondary treated water W2, permeated water W3a, concentrated water W3b) generated when the primary treated water W1 is filtered. It is configured to be able to supply to the water preparation equipment 4.

  The manufacturing water preparation facility 4 manufactures manufacturing water (pure water T2a) by treating and preparing raw water T0 such as industrial water, and supplies the manufacturing water to other factory equipment in the factory equipped with the water treatment system 1. It is equipment to do. The production water preparation facility 4 functions as a second production water supply facility for supplying production water as a processing system outside the recovery filtration unit 3. The production water preparation facility 4 is connected to the recovery filtration unit 3 so as to be supplied with predetermined treated water (secondary treated water W2, permeated water W3a, concentrated water W3b) from the recovery filtration unit 3. Yes. The production water preparation facility 4 is also connected to the wastewater treatment facility 2 through a water passage line L22 described later. The production water preparation facility 4 is connected to the wastewater treatment facility 2 so that various wastewaters generated during the capacity regeneration process of an apparatus (described later) constituting the production water preparation facility 4 can be returned to the wastewater treatment facility 2. .

  In the water treatment system 1 according to the present embodiment, the primary treated water W1 treated by the existing wastewater treatment facility 2 is collected by the collection filtration unit 3 with the configuration described above, and the collected water is filtered and filtered. Supply water as production water. In addition, the water treatment system 1 according to the present embodiment supplies predetermined treated water obtained by the recovery filtration unit 3 as cleaning water used at the time of capacity regeneration processing of an apparatus (described later) constituting the production water preparation facility 4. To do. In this way, treated water obtained by treating organic wastewater (raw water W0) generated in a factory or the like can be effectively reused.

  In addition, since the recovery filtration unit 3 that collects and filters the treated water of the wastewater treatment facility 2 is additionally connected to the existing wastewater treatment facility 2 (and the production water preparation facility 4 and the like), the recovery filtration unit 3 can be set up efficiently.

  Next, specific configurations of the wastewater treatment facility 2, the recovery filtration unit 3, and the production water preparation facility 4 will be described in order.

  The waste water treatment facility 2 includes a raw water tank 9, a flow rate adjustment tank 10, an aeration tank 11, a sedimentation tank 12, a water flow line L1-L6, pumps P1-P3, and blowers B1, B2.

  The water flow line L <b> 1 is a line through which the raw water W <b> 0, which is organic wastewater generated in a factory or the like provided with the water treatment system 1, is passed through the raw water tank 9. The raw water tank 9 is a tank that stores the raw water W0 supplied from the water flow line L1. The pump P1 is a pump that sucks the raw water W0 stored in the raw water tank 9 and sends it to the flow rate adjusting tank 10 through the water flow line L2.

  The flow rate adjustment tank 10 is connected to the downstream side of the raw water tank 9, and stores the raw water W0 supplied from the raw water tank 9 through the water flow line L2. The flow rate adjusting tank 10 has a function of adjusting the flow rate of the raw water W0 supplied to the aeration tank 11 described later by storing the raw water W0. The flow rate adjustment tank 10 having such a flow rate adjustment function is configured to absorb fluctuations in the amount of raw water W0 used in the aeration tank 11. The blower B <b> 1 is a blower that aerates the raw water W <b> 0 stored in the flow rate adjustment tank 10. Since the quality of the raw water W0 flowing into the flow rate adjustment tank 10 fluctuates, the raw water W0 in the flow rate adjustment tank 10 is agitated by aeration of the blower B1 so as not to be spoiled. The pump P2 is a pump that sucks the raw water W0 stored in the flow rate adjustment tank 10 and sends it to the aeration tank 11 through the water flow line L3.

  The aeration tank 11 is connected to the downstream side of the flow rate adjustment tank 10 and is a tank for biologically treating the raw water W0 supplied from the flow rate adjustment tank 10. The aeration tank 11 of the present embodiment is provided as a tank that performs activated sludge treatment using activated sludge (not shown) among biological treatments. The blower B <b> 2 is a blower that aerates the raw water W <b> 0 stored in the aeration tank 11. In the aeration tank 11, the activated sludge treatment of the raw water W0 is performed by performing a process combining aeration by the blower B2 and activated sludge. The raw water W0 that has been subjected to the activated sludge treatment is subjected to removal of organic substances and the like, and becomes the primary treated water W1. The water flow line L4 is a line through which the primary treated water W1 obtained in the aeration tank 11 passes through the settling tank 12.

  The settling tank 12 is a tank that is connected to the downstream side of the aeration tank 11 and stores the primary treated water W1 supplied from the aeration tank 11 to settle impurities. In the settling tank 12, impurities are settled over time, and separation into impurities and a supernatant liquid is performed. The supernatant obtained in the settling tank 12 is discharged into the sewage through the water flow line L5.

  In addition to the water flow line L4, a water flow line L6 for passing the primary treated water W1 is connected to the aeration tank 11. The water passage line L6 is a line through which the primary treated water W1 in the aeration tank 11 is passed to the recovery filtration unit 3 outside the waste water treatment facility 2. The pump P3 provided in the aeration tank 11 is a pump that sucks the primary treated water W1 in the aerated tank 11 and supplies the primary treated water W1 to the recovery filtration unit 3 through the water passage line L6. .

  With the above-described configuration, the wastewater treatment facility 2 performs biological treatment (activated sludge treatment in this embodiment) on the raw water W0 of organic wastewater generated at a factory or the like to obtain the primary treated water W1 and the obtained primary treatment. It is configured to provide water W1 to the sewage discharge or recovery filtration unit 3.

  The operation of the pumps P1 and P2 and the blowers B1 and B2 in the waste water treatment facility 2 described above is controlled and managed by a control device provided in the waste water treatment facility 2 (not shown). On the other hand, since the pump P3 is a device for the recovery filtration unit 3 to take in the primary treated water W1, the operation of the pump P3 is controlled and managed by a control unit 19 (described later) provided in the recovery filtration unit 3. The

  The recovery filtration unit 3 is additionally connected to the existing wastewater treatment facility 2 and collects the primary treated water W1 from the wastewater treatment facility 2 by receiving the supply of the primary treated water W1 from the wastewater treatment facility 2. Unit. The recovery filtration unit 3 includes a filtration membrane device 13, tanks 14, 17, 18, a drug supply device 15, a reverse osmosis membrane device 16, a control unit 19, water flow lines L7-L16, and pumps P4-P9. And valves V1-V7.

  The filtration membrane device 13 is a device that obtains the secondary treated water W2 by subjecting the primary treated water W1 recovered from the waste water treatment facility 2 to membrane filtration separation using a filtration membrane. The filtration membrane device 13 of this embodiment includes a membrane separation tank 20, a filtration membrane module 21, and a blower B3. The membrane separation tank 20 is a tank for storing the primary treated water W1 collected from the wastewater treatment facility 2. An immersion type filtration membrane module 21 is provided in the membrane separation tank 20. The filtration membrane module 21 is a membrane that filters the primary treated water W1 in the membrane separation tank 20. As the filtration membrane module 21 of this embodiment, a microfiltration membrane module (MF membrane) or an ultrafiltration membrane module (UF membrane) is used. The blower B3 is a blower for aeration of the primary treated water W1 stored in the membrane separation tank 20. The pump P4 is a pump that sucks the secondary treated water W2 that has passed through the filtration membrane module 21.

  In the filtration membrane device 13 having the above-described configuration, the membrane separation activated sludge treatment of the primary treated water W1 is performed in the membrane separation tank 20 by performing aeration by the blower B3 and suction by the pump P4. The primary treated water W1 that has been subjected to the membrane separation activated sludge treatment is subjected to biodegradation of organic matter to become the secondary treated water W2. The pump P4 sucks the secondary treated water W2 obtained by the filtration membrane device 13 and sends the sucked secondary treated water W2 to the tank 14 through the water passage line L7.

  The tank 14 is connected to the downstream side of the filtration membrane device 13 and stores the secondary treated water W2 supplied from the filtration membrane device 13 through the water passage line L7. The tank 14 has a function of adjusting the flow rate of the secondary treated water W2 supplied to the reverse osmosis membrane device 16 described later by storing the secondary treated water W2. The tank 14 having such a flow rate adjusting function is configured to absorb fluctuations in the usage amount of the secondary treated water W2 in the reverse osmosis membrane device 16. Two water lines L8 and L9 are connected to the tank.

  The water flow line L8 is a line for passing the secondary treated water W2 stored in the tank 14 to the reverse osmosis membrane device 16 on the downstream side. The pump P5 provided in the middle of the water flow line L8 is a pump that sucks the secondary treated water W2 stored in the tank 14 and sends it to the reverse osmosis membrane device 16 through the water flow line L8. The pump P5 further has a function of pressurizing the secondary treated water W2 against the reverse osmosis membrane device 16 side so as to provide a pressure necessary for processing in the downstream reverse osmosis membrane device 16.

  In the middle of the water flow line L8, a chemical supply device 15 that supplies a predetermined chemical to the secondary treated water W2 in the water flow line L8 is connected. The drug supply device 15 of the present embodiment supplies a drug containing an intercellular information transmission substance. The intercellular information transmitting substance is a compound for promoting the dispersion of the biofilm or inhibiting its formation in the reverse osmosis membrane of the reverse osmosis membrane device 16 to which the secondary treated water W2 is supplied.

  Here, the intercellular information transmission substance that promotes the dispersion of the biofilm is also referred to as a biofilm dispersion signal substance. By supplying the intercellular communication medium that promotes the dispersion of the biofilm to the secondary treated water W2, it penetrates into the biofilm and gives the bacteria in the film a signal that induces the bacteria to float. Biofilm can be dispersed. A biofilm is a colony formed by extracellular polysaccharides (EPS) secreted by bacteria grown on a membrane surface, and is also referred to as a slime. Intercellular information transmitters (intercellular signal substances) are substances that transmit information between cells.

  The intercellular information transmission substance that inhibits the formation of a biofilm corresponds to an inhibitor having a structure similar to that of a biofilm formation signal substance, and examples thereof include AHL (acylated homoserine lactone). By supplying an intercellular information transmission substance that inhibits biofilm formation to the secondary treated water W2, quorum sensing can be suppressed and slime growth can be suppressed. Quorum sensing is also referred to as an intercellular communication mechanism, and is a mechanism that senses the cell density using an intercellular signal transmission substance (intercellular signal substance) and controls the production of the substance accordingly.

  The water flow line L9 is a line through which the secondary treated water W2 stored in the tank 14 is passed to the production water preparation facility 4 described later. A valve V1 and a pump P6 are provided in the middle of the water passage line L9. The valve V1 is a valve that opens and closes the water flow line L9. The pump P6 is a pump that sucks the secondary treated water W2 stored in the tank 14 in a state where the valve V1 is opened, and sends it to the production water preparation facility 4 through the water flow line L9.

  On the other hand, the reverse osmosis membrane device 16 to which the secondary treated water W2 is supplied separates the secondary treated water W2 by the reverse osmosis membrane module 16A to obtain the permeated water W3a and the concentrated water 3b as the tertiary treated water. Device. The pressure required for membrane separation in the reverse osmosis membrane module 16A is provided by pressurization by the upstream pump P5.

  The reverse osmosis membrane device 16 is connected with a water flow line L10 and a water flow line L11. The water passage line L <b> 10 is a line through which the permeated water W <b> 3 a obtained by the reverse osmosis membrane device 16 is passed to the tank 17. A valve V2 that opens and closes the water line L10 is provided in the middle of the water flow line L10.

  The water passage line L11 is a line through which the concentrated water W3b obtained by the reverse osmosis membrane device 16 is passed to the tank 18. In the middle of the water flow line L11, a water flow line L12 branched at a connection point J1 is connected. The water flow line L12 is connected in the middle of the water flow line L8 between the above-described medicine supply device 15 and the pump P5, and the remaining portion of the concentrated water W3b can be supplied to the secondary treated water W2 in the water line L8. Configured. Thereby, the water flow line L12 functions as a reflux line for returning the remaining portion of the concentrated water W3b to the reverse osmosis membrane device 16. In the middle of the water flow line L12, a valve V3 for adjusting the flow rate of the concentrated water W3b to be recirculated to the upstream side of the water flow line L8 is provided.

  The reverse osmosis membrane device 16 is configured as a device including the water flow lines L8, L10-L12, the pump P5, and the reverse osmosis membrane module 16A.

  The tank 17 connected to the downstream side of the reverse osmosis membrane device 16 is a tank for storing permeated water W3a as tertiary treated water supplied from the reverse osmosis membrane device 16 through the water passage line L10. The tank 17 has a function of adjusting the flow rate of the permeated water W3a to be supplied to other factory equipment and manufacturing water preparation equipment 4 described later by storing the permeated water W3a. The tank 17 having such a flow rate adjusting function is configured to absorb fluctuations in the amount of permeate W3a used in other factory equipment and manufacturing water preparation equipment 4. Two water flow lines L13 and L14 are connected to the tank 17.

  The water flow line L13 is a line through which the permeated water W3a stored in the tank 17 is passed to other factory equipment. A valve V4 and a pump P7 are provided in the middle of the water passage line L13. The valve V4 is a valve that opens and closes the water flow line L13. The pump P7 is a pump that sucks the permeated water W3a as the tertiary treated water stored in the tank 17 in a state where the valve V4 is opened, and sends it to other factory equipment through the water passage line L13.

  The water passage line L14 provided in parallel with the water passage line L13 is a line through which the permeated water W3a stored in the tank 17 is passed to the production water preparation facility 4. A valve V5 and a pump P8 are provided in the middle of the water passage line L14. The valve V5 is a valve that opens and closes the water flow line L14. The pump P8 is a pump that sucks the permeated water W3a as the tertiary treated water stored in the tank 17 and sends the permeated water W3a to the production water preparation facility 4 through the water passage line L14 in a state where the valve V5 is opened.

  Separately from the tank 17, the tank 18 connected to the downstream side of the reverse osmosis membrane device 16 is a tank for storing concentrated water W3b as tertiary treated water supplied through the water flow line L11. The tank 18 has a function of adjusting the flow rate of the concentrated water W3b supplied to the production water preparation facility 4 described later by storing the concentrated water W3b. The tank 18 having such a flow rate adjusting function is configured to absorb fluctuations in the amount of concentrated water W3b used in the production water preparation facility 4. Two water lines L15 and L16 are connected to the tank 18.

  The water flow line L15 is a line through which the concentrated water W3b stored in the tank 18 is passed to the production water preparation facility 4. A valve V6 and a pump P9 are provided in the middle of the water flow line L15. The valve V6 is a valve that opens and closes the water flow line L15. The pump P9 is a pump that sucks the concentrated water W3b as the tertiary treated water stored in the tank 18 in a state where the valve V6 is opened and sends the concentrated water W3b to the production water preparation facility 4 through the water flow line L15.

  The water flow line L16 provided in parallel with the water flow line L15 is a line that passes (drains) the concentrated water W3b stored in the tank 18 to the outside of the recovery filtration unit 3. A valve V7 for adjusting the flow rate of the concentrated water W3b to be drained to the outside is provided in the middle of the water flow line L16.

  The recovery filtration unit 3 collects and filters the primary treated water W1 obtained in the wastewater treatment facility 2 and filters the filtered water (permeated water W3a as the tertiary treated water) as the production water. It can be supplied to factory equipment. The recovery filtration unit 3 is further configured to be able to supply the secondary treated water W2 and the permeated water W3a and the concentrated water W3b as the tertiary treated water to the production water preparation facility 4.

  The operations of the above-described pumps P4-P9, valves V1-V7, blower B3, medicine supply device 15 and the like of the recovery filtration unit 3 are controlled and managed by the control unit 19 provided in the recovery filtration unit 3.

  The production water preparation facility 4 connected to the downstream side of the recovery filtration unit 3 includes a filtration device 22, an ion exchange device 23, water flow lines L17-L22, a pump P10, and valves V8-V10.

  The water flow line L <b> 17 is a line through which raw water T <b> 0 (industrial water or the like) pumped by the well facility in the factory is passed to the filtration device 22. The filtration device 22 is a device that obtains filtered water T1a by filtering the raw water T0 supplied through the water passage line L17 with a filter medium (not shown). Specific examples of the filtration device 22 include a sand filtration device, activated carbon filtration device, iron removal manganese removal device, etc., in which a filtration tower is filled with a filter material bed made of particulate filter material, or an MF membrane / UF membrane module is mounted. There is a membrane filtration device.

  A water passage line L18 and a water passage line L19 are connected to the filtration device 22. The water flow line L <b> 18 is a line through which the filtered water T <b> 1 a obtained by the filtration device 22 is passed to the ion exchange device 23. The water flow line L <b> 19 is a line that passes (drains) the cleaning waste water T <b> 1 b generated in the capacity regeneration process (described later) of the filtration device 22 to the outside of the production water preparation facility 4.

  The filtration device 22 configured as described above is configured to be capable of performing a capacity regeneration process for regenerating the filtration capacity in accordance with a decrease in the filtration capacity of the filter medium. In the capacity regeneration process of the filtration device 22, the concentrated water W3b from the recovery filtration unit 3 is used as backwash water, and the secondary treated water W2 is used as rinse water. The backwashing water and rinsing water used for the capacity regeneration process are discharged as washing wastewater T1b (backwashing wastewater, rinsing wastewater). The filtration device 22 includes a required flow path control valve (not shown) in order to switch between normal operation and capacity regeneration operation flow paths, which will be described later.

  The ion exchange device 23 is connected to the downstream side of the filtration device 22 and treats the filtered water T1a supplied from the filtration device 22 with a combination of a cation exchange resin and an anion exchange resin (not shown). It is an apparatus for obtaining water T2a. Specific examples of the ion exchange device 23 include a mixed bed ion exchange device and a two-bed / two-column ion exchange device.

  A water flow line L20 and a water flow line L21 are connected to the ion exchange device 23. The water flow line L <b> 20 is a line through which pure water T <b> 2 a obtained by the ion exchange device 23 is passed as manufacturing water to other factory equipment in the factory including the water treatment system 1. The water flow line L <b> 21 is a line through which the recycled waste water T <b> 2 b generated in the capacity regeneration process (described later) of the ion exchange device 23 is passed (drained) to the outside of the production water preparation facility 4.

  The ion exchange device 23 configured as described above is configured to be capable of performing a capacity regeneration process for regenerating the ion exchange capacity in accordance with a decrease in the ion exchange capacity of each ion exchange resin. In the capacity regeneration process of the ion exchange device 23, the permeated water W3a as the tertiary treated water from the recovery filtration unit 3 is used as the regeneration water. The reclaimed water used for the capacity regeneration process is discharged as reclaimed waste water T2b. The ion exchange device 23 includes a required flow path control valve (not shown) in order to switch between a normal operation mode and a capacity regeneration operation channel which will be described later.

  On the other hand, the water flow line L22 branched at the connection point J2 is connected to the water flow line L19 connected to the filtration device 22 described above. The water flow line L22 is a line through which the washing waste water T1b (back washing waste water and rinsing waste water) flowing through the water passage line L19 is passed to the outside of the production water preparation facility 4. The water flow line L22 in the embodiment is connected to the wastewater treatment facility 2 so as to return the washing wastewater T1b to the flow rate adjusting tank 10 of the wastewater treatment facility 2 described above. A valve V8 is provided in the water flow line L19 on the downstream side of the connection point J2. A valve V9 is provided in the middle of the water passage line L22. The valve V8 and the valve V9 are for switching between discarding and returning the cleaning waste water T1b. That is, when the valve V8 is set to the open state and the valve V9 is set to the closed state, the cleaning waste water T1b is discarded outside the system through the water passage line L19. On the other hand, when the valve V8 is set to the closed state and the valve V9 is set to the open state, the cleaning wastewater T1b is returned to the flow rate adjustment tank 10 through the water passage line L22.

  With the above-described configuration, the production water preparation facility 4 produces pure water T2a by performing filtration treatment by the filtration device 22 and ion exchange treatment by the ion exchange device 23 on the raw water T0, and produces the pure water T2a elsewhere. It is configured to supply the equipment as production water. The production water preparation facility 4 further supplies concentrated water W3b (tertiary treated water) and secondary treated water W2 from the recovery filtration unit 3 as backwashing water and rinsing water used for capacity regeneration processing of the filter medium of the filtration device 22, respectively. Also configured to receive. Furthermore, the production water preparation facility 4 is also configured to receive supply of permeate W3a (tertiary treated water) from the recovery filtration unit 3 as regeneration water used for the ion regeneration resin capacity regeneration treatment of the ion exchange device 23. Is done.

  In addition, operation | movement of each apparatus, pump, valve | bulb, etc. of the manufacturing water preparation installation 4 mentioned above is controlled and managed by the control apparatus provided in the manufacturing water preparation installation 4 which is not shown in figure.

  Next, operation | movement of the water treatment system 1 of this embodiment is demonstrated, referring FIG. In addition, although the various structure of the water treatment system 1 was demonstrated above, the other structure which abbreviate | omitted description and illustration may be contained in the water treatment system 1. FIG. For example, although not shown in the above-described water flow lines L1-L22, raw water W0, primary treated water W1, secondary treated water W2, tertiary treated water, permeated water W3a and concentrated water W3b, A pump for sending the raw water T0, filtered water T1a, washing wastewater T1b, pure water T2a, reclaimed wastewater T2b, a valve for opening and closing the flow path, and the like are appropriately provided. These pumps and valves are also controlled by a control device or control unit 19 (not shown).

(Normal operation)
Below, the normal driving | operation of the water treatment system 1 is demonstrated. The normal operation is an operation of manufacturing permeated water W3a as manufacturing water in the recovery filtration unit 3 described later and manufacturing pure water T2a as manufacturing water also in the manufacturing water preparation facility 4.

  First, organic wastewater (raw water W0) generated in equipment such as a factory equipped with the water treatment system 1 is supplied to the raw water tank 9 of the wastewater treatment equipment 2 through the water flow line L1. When the water treatment system 1 is operated, the pumps P1 to P3 and the blowers B1 and B2 are activated in the wastewater treatment facility 2 by a control device (not shown).

  When the pump P1 sucks the raw water W0 in the raw water tank 9, the raw water W0 is supplied to the downstream flow rate adjustment tank 10 through the water flow line L2. The washing water T1b from the production water preparation facility 4 is also supplied to the flow rate adjusting tank 10 through the water flow line L22. Thus, in the flow rate adjustment tank 10, the raw water W0 is stored in a state including the cleaning waste water T1b. In the flow rate adjustment tank 10, aeration by the blower B1 is performed. By this aeration, the raw water W0 in the flow rate adjusting tank 10 is agitated to prevent the raw water W0 from being spoiled. When the pump P2 sucks the raw water W0 in the flow rate adjustment tank 10, the raw water W0 is supplied to the aeration tank 11 on the downstream side through the water flow line L3. In the aeration tank 11, the activated sludge treatment of the raw water W0 is performed by aeration with the blower B2 in a state including activated sludge. By the activated sludge treatment of the raw water W0, the organic matter in the raw water W0 is biodegraded to produce primary treated water W1. The generated primary treated water W1 is sent to the sedimentation tank 12 through the water flow line L4 or sent to the recovery filtration unit 3 through the water flow line L6.

  In the sedimentation tank 12, the natural sedimentation process of the activated sludge contained in the primary treated water W1 is performed. By the sedimentation process, the primary treated water W1 can be separated into the activated sludge and the supernatant liquid excluding the activated sludge. The supernatant liquid is discharged into the sewage through the water flow line L5, and the activated sludge that has settled is separately returned to the aeration tank 11 or discarded as excess sludge.

  On the other hand, in the water flow line L6, the pump P3 sucks the primary treated water W1 in the aeration tank 11, whereby the primary treated water W1 is supplied to the recovery filtration unit 3 outside the waste water treatment facility 2. Thereby, the primary treated water W1 treated by the wastewater treatment facility 2 can be collected by the collection filtration unit 3. In addition, ON / OFF of pump P3 and rotation speed are controlled by the control part 19 of the collection | recovery filtration unit 3 according to the water level of the membrane separation tank 20, for example.

  In the recovery filtration unit 3, the primary treated water W <b> 1 is recovered in the membrane separation tank 20 of the filtration membrane device 13. When the water treatment system 1 is operated, the pumps P4, P5, P7 and the blower B3 are activated and the valves V2, V4 are opened in the recovery filtration unit 3 under the control of the control unit 19. . On the other hand, the pumps P6, P8, and P9 are not started, and the valves V1, V5, and V6 are also closed.

  In the filtration membrane device 13, the aeration treatment by the blower B <b> 3 and the membrane filtration treatment by the filtration membrane module 21 are simultaneously performed on the primary treated water W <b> 1 in the membrane separation tank 20. Thereby, the primary treated water W1 in the membrane separation tank 20 is treated with the membrane separation activated sludge, and the secondary treated water W2 is generated. In the membrane separation activated sludge treatment in the membrane separation tank 20, when undecomposed organic matter remains in the primary treated water W1, further decomposition is performed. Moreover, when solid content (activated sludge) is mixed in the primary treated water W1, the solid content and water are physically separated by the filtration membrane module 21. Therefore, the secondary treated water W2 obtained by the filtration membrane device 13 is more purified than the primary treated water W1 obtained by the above-described wastewater treatment facility 2, and the water quality is remarkably improved. Thereafter, the pump P4 sucks the secondary treated water W2 that has passed through the filtration membrane module 21, whereby the secondary treated water W2 is supplied to the downstream tank 14 through the water passage line L7.

  The tank 14 stores secondary treated water W2. The controller 19 controls the ON / OFF and rotation speed of the pump P4 so that a predetermined amount of the secondary treated water W2 is stored in the tank 14.

  Under the control of the control unit 19, the valve V1 is in a closed state, and the pump P6 is not activated. Therefore, the secondary treated water W2 stored in the tank 14 is not passed through the water passage line L9. Control when the secondary treated water W2 is passed through the water flow line L9 will be described later in the description of the operation of the production water preparation facility 4 (particularly, the description of the capacity regeneration operation of the filtration device 22).

  On the other hand, when the pump P5 sucks the secondary treated water W2 stored in the tank 14, the secondary treated water W2 is supplied to the downstream reverse osmosis membrane device 16 through the water passage line L8. At this time, the chemical | medical agent containing an intercellular information transmission substance is supplied to the secondary treated water W2 from the chemical | medical agent supply apparatus 15 provided in the middle of the water flow line L8. The secondary treated water W <b> 2 supplied with such a chemical is supplied to the reverse osmosis membrane device 16.

  In the reverse osmosis membrane device 16 to which the secondary treated water W2 is supplied through the water flow line L8, the treatment by the reverse osmosis membrane module 16A is performed on the secondary treated water W2 while being pressurized by the upstream pump P5. In the reverse osmosis membrane module 16A, dissolved salts contained in the secondary treated water W2 are separated by the reverse osmosis membrane. Thereby, permeated water W3a with high purity from which dissolved salts have been removed and concentrated water W3b with concentrated dissolved salts can be generated as tertiary treated water, respectively. Here, the chemical | medical agent containing the intercellular information-transmitting substance is added to the secondary treated water W2 supplied to the reverse osmosis membrane apparatus 16 from the chemical | medical agent supply apparatus 15. FIG. Therefore, in the reverse osmosis membrane module 16A of the reverse osmosis membrane device 16 that performs membrane separation using the secondary treated water W2, biofilm formation can be inhibited or dispersion can be promoted.

  Under the control of the control unit 19, the valve V2 is in an open state. In this state, the permeated water W3a is supplied to the tank 17 on the downstream side through the water passage line L10. The tank 17 stores permeated water W3a. On the other hand, the concentrated water W3b is supplied to the tank 18 through the water flow line L11. The tank 18 stores concentrated water W3b.

  Here, the valve V3 provided in the water flow line L12 branched from the water flow line L11 is controlled by the control unit 19 so as to adjust the opening degree appropriately. For example, by adjusting the opening degree of the valve V3, the concentrated water W3b in the water passage line L11 can be returned to the secondary treated water W2 in the water passage line L8 through the water passage line L12.

  In the present embodiment, the control unit 19 can control the reverse osmosis membrane device 16 to perform the flushing operation. The flushing operation is an operation of washing away deposits adhering to the primary membrane surface of the reverse osmosis membrane module 16A when a sufficient amount of the permeated water W3a is stored in the tank 17 storing the permeated water W3a. . In the flushing operation of the present embodiment, the control unit 19 performs control so as to decrease the rotation speed of the pump P5 while the valves V2 and V3 are opened. By controlling the flow rate of the concentrated water W3b while reducing the flow rate of the permeated water W3a by such control, the inflow and reflux of the concentrated water W3b to the tank 18 can be used as main flow paths. Thereby, the deposit on the primary membrane surface of the reverse osmosis membrane module 12A can be washed away. In addition to maintaining the flow rate of the concentrated water W3b, the flow rate of the concentrated water W3b may be controlled to increase. Alternatively, the flushing operation may be performed by controlling the valve V2 to be closed while the valve V3 is open so that only the concentrated water W3b is allowed to flow without flowing the permeated water W3a.

  On the other hand, the permeated water W3a stored in the tank 17 is passed through the water passage line L13. Under the control of the control unit 19, the valve V4 is in an open state, and the pump P7 is also activated. In this way, the pump P7 sucks the permeated water W3a stored in the tank 17 with the valve V4 open, so that the permeated water W3a flows to the outside of the collection filtration unit 3 through the water flow line L13. Is done. This permeated water W3a is supplied as manufacturing water to other factory equipment outside the recovery filtration unit 3. Thus, the permeated water W3a with high purity from which dissolved salts are removed can be supplied as water for production in other factory equipment.

  In the present embodiment, the control unit 19 of the recovery filtration unit 3 performs control so as to appropriately switch ON / OFF of the operation of the reverse osmosis membrane device 16 based on the amount of production water required in other factory equipment. ing. In accordance with ON / OFF of the operation of the reverse osmosis membrane device 16, the aeration operation by the blower B3 is also controlled to be switched ON / OFF. Specifically, control is performed to stop the operation of the blower B3 of the filtration membrane device 13 in accordance with the stop (OFF) of the operation of the reverse osmosis membrane device 16. Thus, the blower can be operated at a more appropriate timing by interlocking the operation of the blower B3 with the operation of the reverse osmosis membrane device 16. In addition, according to the stop of the operation of the reverse osmosis membrane device 16, the operation of the blower B3 of the filtration membrane device 13 may be controlled to be intermittently operated.

  On the other hand, the valve V5 is in a closed state under the control of the control unit 19, and the pump P8 is not activated. Accordingly, the permeation W3a stored in the tank 17 is not passed through the water passage line L14. Control when the permeated water W3a is passed through the water passage line L14 will be described later in the description of the operation of the production water preparation facility 4 (particularly, the description of the capacity regeneration operation of the ion exchange device 23).

  Next, when returning to the tank 18, in the water flow line L15 connected to the tank 18, the valve V6 is closed under the control of the control unit 19, and the pump P9 is not activated. Thus, the concentrated water W3b stored in the tank 18 is not passed through the water passage line L15. Control for passing the concentrated water W3b through the water flow line L15 will be described later in the description of the operation of the production water preparation facility 4 (particularly, the description of the capacity regeneration operation of the filtration device 22).

  On the other hand, the valve V7 is controlled by the control unit 19 so as to switch its opening and closing as appropriate. By switching the opening and closing of the valve V7, the concentrated water W3b stored in the tank 18 can be appropriately discharged to the outside of the recovery filtration unit 3 through the water passage line L16.

  Next, in the production water preparation facility 4 provided on the downstream side of the recovery filtration unit 3, when the water treatment system 1 is operated, the valve V8 is opened and the valve V9 is closed.

  First, the raw water T0 is supplied to the filtration device 22 through the water passage line L17. In the filtering device 22, the raw water T0 is filtered. Specifically, by filtering the raw water T0 with the filter medium of the filtration device 22, predetermined impurities (such as turbid components and organic substances) are removed. Thereby, filtered water T1a from which predetermined impurities are removed is generated. The filtered water T1a is passed through the water passage line L18. The filtered water T1a passed through the water passage line L18 is supplied to the ion exchange device 23 on the downstream side.

  In the ion exchange device 23 to which the filtrate T1a is supplied, the ion exchange treatment with the ion exchange resin is performed on the filtrate T1a. Specifically, filtered water T1a is passed through a packed bed of a cation exchange resin and an anion exchange resin (both not shown) included in the ion exchange device 23. Thereby, the anion and cation contained in filtered water T1a are each removed. In this way, pure water T2a from which cations and anions have been removed is generated. The pure water T2a is passed through the water passage line L20. The pure water T2a passed through the water flow line L20 is supplied as production water to other factory equipment outside the production water preparation equipment 4. Thus, high quality pure water T2a can be supplied as water for production in other factory equipment.

  According to the normal operation of the water treatment system 1 described above, the permeated water W3a produced by the recovery filtration unit 3 is supplied to other factory equipment as production water, and the pure water T2a produced by the production water preparation equipment 4 is also supplied from other factory equipment. Can be supplied as manufacturing water.

  The normal operation of the water treatment system 1 has been described above, but other operations can also be performed. As specific examples, the capacity regeneration operation of the filtration device 22 and the capacity regeneration operation of the ion exchange device 23 in the production water preparation facility 4 will be described below.

(Capability regeneration operation of filtration equipment)
In the filtering device 22, the turbid components contained in the raw water T0 are trapped and deposited in the voids of the filter medium as filtration with the filter medium is performed. When the amount of trapped turbid components increases, the filtration capacity of the filter medium (capacity to trap turbid components) decreases. In response to this, the capacity regeneration operation of the filtration device 22 is performed at a predetermined timing.

  The capacity regeneration operation of the filtration device 22 according to the present embodiment includes a reverse cleaning process (back cleaning operation) in the previous process and a rinsing process (rinsing operation) in the subsequent process as two processes.

  In the reverse cleaning step, predetermined reverse cleaning water is passed through the filter medium bed to separate the turbid components deposited on the filter medium bed and perform reverse cleaning. Specifically, the concentrated water W3b stored in the tank 18 of the recovery filtration unit 3 is passed from the secondary side to the primary side of the filter medium bed of the filtration device 22 to perform reverse cleaning. In order to realize this, the control device of the production water preparation facility 4 (not shown) transmits a signal to the control unit 19 of the recovery filtration unit 3 to open the valve V6 provided on the downstream side of the tank 18 and to pump P9. Control to drive. As a result, the pump P9 sucks the concentrated water W3b stored in the tank 18 in a state where the valve V6 is opened, so that the concentrated water W3b is supplied to the filtration device 22 of the production water preparation facility 4 through the water flow line L15. Is supplied.

  The concentrated water W3b is passed from the secondary side to the primary side of the filter medium, so that the turbid component deposited on the filter medium bed is peeled off. The washed waste water T1b (backwash waste water) containing the separated turbid components flows out toward the water flow line L19 described above. As described above, the water for backwashing the filter medium bed is a clean water that does not contain turbid components, so that a sufficient washing effect can be obtained. Therefore, the concentrated water W3b can be effectively reused by applying water having a high salt concentration such as the concentrated water W3b to the water for backwashing.

  In the first half of the back washing process (for example, the first half 5 minutes), the valve 8 is opened and the valve V9 is closed. Therefore, the cleaning wastewater T1b that has flowed out to the water passage line L19 is not passed through the water passage line L22, but only drained out of the system. The washing waste water T1b drained in this way corresponds to a preceding portion of the back washing waste water discharged during the back washing operation.

  On the other hand, in the second half of the back washing process (for example, the second half 10 minutes), the valve 8 is closed and the valve V9 is opened. In this way, the cleaning waste water T1b is passed through the water passage line L22 by switching the opening and closing of the valves V8 and V9. The washing waste water T1b passed through the water passage line L22 is returned to the flow rate adjustment tank 10 of the waste water treatment facility 2. The cleaning wastewater T1b returned in this way corresponds to the subsequent portion of the backwashing wastewater discharged during the backwashing operation. In the second half of the reverse cleaning process, the removal of turbid components from the filter medium bed proceeds, and accordingly, the turbidity of the cleaning wastewater T1b gradually decreases. Accordingly, instead of discarding the cleaning wastewater T1b, the cleaning wastewater T1b (reverse cleaning wastewater) can be effectively reused by returning it to the flow rate adjusting tank 10 and mixing it with the raw water W0.

  After the back washing process is performed for a predetermined time (for example, 15 minutes), the rinsing process is performed. In the rinsing step, a predetermined amount of rinsing water is passed through the filter bed from which the turbid components have been removed by performing the reverse washing step, thereby compressing and solidifying the backwash-developed filter medium bed and turbidity remaining on the filter medium bed. The quality component is washed away. Specifically, the secondary treated water W2 stored in the tank 14 of the recovery filtration unit 3 is passed as rinsing water from the primary side to the secondary side of the filter medium bed. In order to realize this, the control device of the production water preparation facility 4 (not shown) transmits a signal to the control unit 19 of the recovery filtration unit 3 to open the valve V1 provided on the downstream side of the tank 14 and to pump P6. Control to drive. In this way, with the valve V1 opened, the pump P6 sucks the secondary treated water W2 stored in the tank 14, and thereby passes through the water line L9 to the filtration device 22 of the production water preparation facility 4. Secondary treated water W2 is supplied.

  By passing the secondary treated water W2 from the primary side to the secondary side of the filter medium bed, the filter medium bed developed by backwashing can be consolidated and the filter medium bed can be rinsed. Since the water used here brings the filter medium bed into a state where the production of the filtered water T1a can be quickly started, use of water having a high cleanliness is required. Therefore, by using the secondary treated water W2, which is water having a lower turbidity than the concentrated water W3b, the secondary treated water W2 is effectively reused while effectively washing away the turbid components remaining on the filter medium bed. be able to. In the rinsing process, the valve 8 is controlled to be closed and the valve V9 is opened as in the latter half of the reverse cleaning process, and the cleaning wastewater T1b (rinsing wastewater) is discharged through the water passage line L22. It is returned to the flow rate adjustment tank 10 of the processing facility 2. In the rinsing process, since the removal of the turbid component from the filter medium bed has already been completed by the reverse cleaning process, the cleaning waste water T1b does not contain much turbid component. By returning such washing waste water T1b (rinsing waste water) to the flow rate adjusting tank 10 through the water flow line L22, the secondary treated water W2 can be effectively reused.

(Ion exchange equipment capacity regeneration operation)
In the ion exchange device 23, the ion exchange capability of the ion exchange device 23 decreases as the ion exchange process is performed using the ion exchange resin bed. In response to this, the capacity regeneration operation of the ion exchange device 23 is performed at a predetermined timing.

  The capacity regeneration operation of the ion exchange device 23 in this embodiment includes a liquid passing process, an extrusion process, and a rinsing process.

  The liquid passing process is a process of passing the regenerant solution through the ion exchange resin bed. Specifically, a regenerant solution in which a chemical such as hydrochloric acid is diluted with a predetermined regeneration water is passed through the cation exchange resin bed from the secondary side to the primary side, and the anion exchange resin bed is passed through the anion exchange resin bed. From the secondary side to the primary side, a regenerant solution obtained by diluting a chemical such as a sodium hydroxide solution with predetermined regeneration water is passed. Thereby, the reaction proceeds in the opposite direction to the ion exchange treatment (desalting treatment) performed in the normal operation of the ion exchange device 23, whereby the exchange groups of the respective ion exchange resins can be returned to the original state. In the liquid passing process, the control device of the production water preparation facility 4 (not shown) sends a signal to the control unit 19 of the recovery filtration unit 3, opens the valve V5 provided on the downstream side of the tank 17, and operates the pump P8. To control. Accordingly, the permeated water W3a stored in the tank 17 is sucked by the pump P8 with the valve V5 opened, whereby the permeated water W3a is supplied to the ion exchange device 23 through the water flow line L14. In parallel with the supply of the permeated water W <b> 3 a, the control device of the production water preparation facility 4 supplies the chemical for regeneration from the chemical supply device (not shown) to the ion exchange device 23. The chemicals and permeate W3a supplied to the ion exchange device 23 are mixed in a flow path control valve (not shown) to prepare a regenerant solution.

  After supplying a necessary amount of the regenerant solution in the liquid passing process, an extrusion process is performed. The extruding step is a step of completing the regeneration of the ion exchange resin bed by extruding the regenerant solution introduced into the ion exchange resin bed with a predetermined regeneration water. Specifically, by passing the permeated water W3a stored in the tank 17 of the recovery filtration unit 3 from the secondary side to the primary side of the cation exchange resin bed or the anion exchange resin bed, The regenerant solution is replaced with permeated water W3a (extruded water). In order to realize this, the control device of the production water preparation facility 4 (not shown) transmits a signal to the control unit 19 of the recovery filtration unit 3 to open the valve V5 provided on the downstream side of the tank 17 and to pump P8. Control to drive. Accordingly, the permeated water W3a stored in the tank 17 is sucked by the pump P8 with the valve V5 opened, whereby the permeated water W3a is supplied to the ion exchange device 23 through the water flow line L14.

  By passing the permeated water W3a from the secondary side of the cation exchange resin bed or the anion exchange resin bed toward the primary side, the entire amount of the regenerant solution required for regeneration passes through the resin bed. Playback is complete. The recycled wastewater T2b that has passed through the resin bed is drained to the outside of the production water preparation facility 4 through the water flow line L21 described above.

  Here, in the cation exchange resin bed and the anion exchange resin bed provided in the ion exchange device 23, when water containing dissolved salts is passed as extruded water, the dissolved salts are adsorbed on the ion exchange resin during regeneration. Therefore, there is a possibility that a desired level of capability regeneration cannot be realized. When the ion exchange resin is contaminated with dissolved salts, the purity of the pure water T2a is deteriorated. In response to this, by using water with high purity such as the permeated water W3a containing almost no dissolved salt, the ion exchange resin can be effectively regenerated without being contaminated with the dissolved salt. As another method, it is conceivable to use pure water T2a produced by the ion exchange device 23 as an extruded water for capacity regeneration treatment. In this case, however, the production can be supplied from the ion exchange device 23 to other factory equipment. The total amount of water used will be reduced. Therefore, by using the permeated water W3a from the recovery filtration unit 3 as the regeneration water as in this embodiment, the supply capacity of pure water by the ion exchange device 23 can be maintained at a high level.

  After performing the extrusion process for a predetermined time (for example, 35 minutes), a rinsing process is performed. The rinsing step is a step in which predetermined regeneration water is passed through the ion exchange resin bed to wash away the regenerant solution remaining on the resin bed. Specifically, the permeated water stored in the tank 17 of the recovery filtration unit 3 from the primary side to the secondary side of the cation exchange resin bed or the anion exchange resin bed as in the above-described extrusion step. By passing W3a, the voids and the surface of each ion exchange resin bed are rinsed. In order to realize this, the permeated water stored in the tank 17 is transmitted from the control device of the production water preparation facility 4 (not shown) to the control unit 19 of the recovery filtration unit 3 in the same manner as in the extrusion process described above. W3a is supplied to the ion exchange device 23 of the production water preparation facility 4.

  By passing the permeated water W3a from the primary side to the secondary side of each ion exchange resin bed, the regenerant solution remaining on the resin bed is washed away, and the pure water T2a can be produced again. . The recycled wastewater T2b that has passed through the resin bed is drained to the outside of the production water preparation facility 4 through the water flow line L21 described above. Similar to the extrusion process described above, in the rinsing process, high-purity water such as the permeated water W3a containing almost no dissolved salts is used as regeneration water, so that the pure water supply capability by the ion exchange device 23 is increased to a high level. Can be maintained.

  As described above, in the water treatment system 1 in the present embodiment, the concentrated water W3b obtained by the reverse osmosis membrane device 16 of the recovery filtration unit 3 is supplied as the reverse cleaning water for the filter medium in the filtration device 22 of the production water preparation facility 4. The secondary treated water W2 obtained by the filtration membrane device 13 is supplied as rinsing water for the filter medium after backwashing. In this way, by properly using the reuse application according to the purity of the secondary treated water W2 and the concentrated water W3b, these waters can be effectively reused. Further, the permeated water W3a as the tertiary treated water obtained by the reverse osmosis membrane device 16 is supplied as water for regenerating the ion exchange resin in the ion exchange device 23. Thus, by using the permeated water W3a having a high purity as the regeneration water for the ion exchange device 23, the supply capacity of pure water by the ion exchange device 23 can be maintained at a high level.

  As described above, the exemplary configuration and operation method of the water treatment system 1 of the present embodiment have been described, but the present invention is not limited to this.

  In the above description, the case where the recovery filtration unit 3 recovers the primary treated water W1 from the aeration tank 11 in the wastewater treatment facility 2 has been described, but the present invention is not limited to such a case. For example, the primary treated water W1 may be recovered from the settling tank 12 of the wastewater treatment facility 2.

  In the above description, in the wastewater treatment facility 2, the case where the raw water W0 of the organic wastewater is treated by the aerobic activated sludge treatment to generate the primary treated water W1 has been described. Not exclusively. For example, the raw water W0 may be treated by various biological treatments including aerobic biological treatment and anaerobic biological treatment other than activated sludge treatment.

  Moreover, although the above-mentioned description demonstrated the case where the water flow line L9 which returns the concentrated water W3b in order to adjust salt concentration was connected to the secondary treated water W2 stored in the tank 14, Not limited to cases. It may be returned to any location as long as it is upstream of the reverse osmosis membrane device 16.

  In the above description, in the capacity regeneration process of the filtration device 22 and the ion exchange device 23, the case where a part of the backwash wastewater and the rinse wastewater are returned to the flow rate adjustment tank 10 of the wastewater treatment facility 2 has been described. It is not limited to such a case. For example, you may connect the water flow line L22 so that these waste_water | drains may be returned to the tank different from the flow volume adjustment tank 10 in the waste water treatment facility 2. FIG.

  As described above, the recovery filtration unit 3 of the present embodiment is connected to the existing wastewater treatment facility 2 that biologically treats the organic wastewater (raw water W0) to obtain the primary treated water W1. The next treated water W1 is collected and filtered, and the filtered water (permeated water W3a) is supplied as production water. Further, the recovery filtration unit 3 includes a filtration membrane device 13 that obtains the secondary treated water W2 by membrane filtration of the primary treated water W1 collected from the waste water treatment facility 2 by the filtration membrane module 21, and a secondary of the filtration membrane device 13. A reverse osmosis membrane device 16 is provided that obtains permeated water W3a and concentrated water W3b as tertiary treated water W3a by membrane separation of treated water W2 by reverse osmosis membrane module 16A. Further, the permeated water W3a obtained as the tertiary treated water obtained by the reverse osmosis membrane device 16 is supplied as production water, while the concentrated water W3b obtained as the tertiary treated water obtained by the reverse osmosis membrane device 16 is supplied to the outside of the unit. Is supplied as backwashing water for the filter medium in the filtration device 22 installed in the treatment system (manufacturing water preparation facility 4), and the secondary treated water W2 obtained by the filtration membrane device 13 is rinsed with the filter medium after backwashing. Supply as irrigation water. In this way, the recovery filtration unit 3 is connected to the existing wastewater treatment facility 2, and the treated water of the wastewater treatment facility 2 is filtered and replenished to the production water preparation facility 4. Treated water can be reused more efficiently. Moreover, since the additional package of the collection | recovery filtration unit 3 can be performed, utilizing the existing waste water treatment facility 2 as it is, the collection | recovery filtration unit 3 can be added more efficiently. Furthermore, by reusing the secondary treated water W2 and the concentrated water W3b according to the water quality, these water can be effectively reused.

  Further, in the recovery filtration unit 3 of the present embodiment, the permeated water W3a obtained as the tertiary treated water obtained by the reverse osmosis membrane device 16 is ion-exchanged installed in a treatment system (manufacturing water preparation equipment 4) outside the unit. It is supplied as water for regeneration of the ion exchange resin in the device 23. When the ion exchange resin is regenerated, water that does not contain dissolved salts is required. However, since the dissolved salts are removed by the reverse osmosis membrane module 16A in the case of the permeated water W3a, it is effective as water for such regeneration. Can be used.

  Furthermore, in the collection filtration unit 3 of the present embodiment, the filtration membrane device 13 includes a tank (membrane separation tank 20) for storing the primary treated water W1 collected from the wastewater treatment facility 2, and a blower that performs aeration in the tank. B3, and a microfiltration membrane module or an ultrafiltration membrane module as the filtration membrane module 21 that performs membrane filtration in the tank. That is, the filtration membrane device 13 is configured as a membrane separation activated sludge treatment unit. Thus, by comprising the filtration membrane apparatus 13 with what is called a MBR unit, while performing a filtration process early compared with structures other than a MBR unit, the quality of treated water can be improved.

  Furthermore, in the collection filtration unit 3 of the present embodiment, the control unit 19 controls the operation of the blower B3 of the filtration membrane device 13 to be stopped or intermittently operated in accordance with the stop of the operation of the reverse osmosis membrane device 16. To do. In this way, by operating the blower B3 of the filtration membrane device 13 in conjunction with the operation of the reverse osmosis membrane device 16, the blower B3 can be operated at a more appropriate timing, thereby realizing energy saving of the recovery filtration unit 3. can do.

  Further, in the recovery filtration unit 3 of the present embodiment, the primary treated water W1 filtered by the recovery filtration unit 3 is subjected to activated sludge treatment of the organic waste water (raw water W0) in the wastewater treatment facility 2, and the primary treated water. The activated sludge treatment tank (aeration tank 11) for obtaining W1 and / or the sedimentation tank 12 for sinking the primary treated water W1 of the activated sludge treatment tank is recovered. Thereby, since additional packaging of the recovery filtration unit 3 can be performed while using the existing wastewater treatment facility 2 as it is, the recovery filtration unit 3 can be added more efficiently.

  The water treatment system 1 of the present embodiment discards the preceding portion of the backwash wastewater out of the backwash wastewater discharged during the backwash operation of the filtration device 22 installed in the treatment system outside the unit (recovery filtration unit 3). On the other hand, the subsequent portion of the backwash wastewater is returned to the existing wastewater treatment facility 2 (flow rate adjusting tank 10), and the rinse wastewater discharged during the rinsing operation of the filtration device is returned to the existing wastewater treatment facility. In this way, by appropriately reusing the backwash waste water and the rinse waste water according to the water quality, these waste waters can be effectively reused.

  Although the present invention has been described with reference to the above embodiment, the present invention is not limited to the above embodiment.

  INDUSTRIAL APPLICABILITY The present invention can be applied to a recovery filtration unit that recovers and filters wastewater from wastewater treatment facilities such as various factories because the treated water in existing wastewater treatment facilities can be reused more efficiently.

DESCRIPTION OF SYMBOLS 1 Water treatment system 2 Waste water treatment equipment 3 Recovery filtration unit 4 Production water preparation equipment 9 Raw water tank 10 Flow rate adjustment tank 11 Reaction tank 12 Sedimentation tank 13 Filtration membrane apparatus 14 Tank 15 Drug supply apparatus 16 Reverse osmosis membrane apparatus 16A Reverse osmosis membrane module 17 Tank 18 Tank 19 Control unit 20 Membrane separation tank 21 Filtration membrane module 22 Filtration device 23 Ion exchange device B1-B3 Blower L1-L22 Flow line P1-P9 Pump V1-V9 Valve W0 Raw water W1 Primary treated water W2 Secondary Treated water (water for rinsing)
W3a permeated water (tertiary treated water, water for production, water for regeneration)
W3b Concentrated water (tertiary treated water, backwash water)
T0 Raw water T1a Filtration water T1b Washing wastewater (back washing wastewater, rinsing wastewater)
T2a Pure water T2b Reclaimed drainage

Claims (5)

Recovery filtration that is connected to existing wastewater treatment equipment that biologically treats organic wastewater to obtain primary treated water, collects and filters the primary treated water of the wastewater treatment equipment, and supplies the filtered water as production water A unit,
A filtration membrane device for obtaining secondary treated water by subjecting the primary treated water recovered from the wastewater treatment facility to membrane filtration with a filtration membrane module;
A reverse osmosis membrane device for obtaining permeated water and concentrated water as tertiary treated water by membrane separation of the secondary treated water of the filtration membrane device by a reverse osmosis membrane module,
While the permeated water as the tertiary treated water obtained by the reverse osmosis membrane device was supplied as water for regenerating the ion exchange resin in the ion exchange device installed in the treatment system outside the unit, it was obtained by the reverse osmosis membrane device. Concentrated water as tertiary treated water is supplied as backwashing water for the filter medium in the filtration device installed in the treatment system outside the unit, and the secondary treated water obtained by the filtration membrane device is used as the filter medium after backwashing. and supply as a rinse water,
The filtration device and the ion exchange device are connected to each other in an external unit that uses raw water as one unit, and the filtration device is arranged on the upstream side, and the ion exchange device is arranged on the downstream side . The filtration membrane device is a tank for storing the primary treated water recovered from the waste water treatment facility, a blower for aeration in the tank, and a microfiltration membrane module or ultrafiltration as a filtration membrane module for membrane filtration in the tank. The recovery filtration unit according to claim 1, comprising a membrane module and configured as a membrane separation activated sludge treatment unit. A control unit for controlling the recovery filtration unit is further provided.
The control unit according to claim 2 , wherein the control unit controls the operation of the blower of the filtration membrane device to be stopped or intermittently operated according to the stop of the operation of the reverse osmosis membrane device. The primary treated water filtered by the recovery filtration unit is an activated sludge treatment tank and / or a primary treatment of the activated sludge treatment tank in which the organic waste water is treated with activated sludge to obtain primary treated water in the waste water treatment facility. The collection | recovery filtration unit as described in any one of Claim 1 to 3 collect | recovered from the sedimentation tank which settles water. A water treatment system comprising the recovery filtration unit according to any one of claims 1 to 4 ,
Of the backwash wastewater discharged during the backwash operation of the filtration device installed in the treatment system outside the unit, the preceding backwash wastewater is discarded, while the backwash wastewater is returned to the existing wastewater treatment facility. In addition, the water treatment system returns the rinsing wastewater discharged during the rinsing operation of the filtration device to the existing wastewater treatment facility.

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