Water Treatment Systems

Abstract

To adjust treated water of a water treatment system to an optimum set water quality or water quantity, and maintain a stable driving state of equipment.SOLUTION: A water treatment system performs water treatment of raw water to supply a demander with the treated water. The water treatment system comprises: a plurality of units having water treatment devices or valves, disposed parallel to each other; a raw water supply pipe and an outflow pipe connected to each of the plurality of units, respectively; and a treated water supply pipe which merges outflow water from each outflow pipe to transfer the water to the demander. At least one of the units is the water treatment device. The water treatment device comprises a controller which controls a raw water supply quantity to each unit and / or an outflow quantity from each unit according to the treated water quality requested by each demander.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a water treatment system, and more particularly to a water treatment system including a plurality of units arranged in parallel, each of which can be supplied with raw water. [Background technology]

[0002] Patent Document 1 describes an example of a water treatment system in which multiple water treatment units are installed in parallel, raw water is supplied to each water treatment unit, and the treated water from each water treatment unit is combined and supplied to the demand point.

[0003] In Patent Document 1, a reverse osmosis membrane device (RO device) and a water softener are installed in parallel, and raw water is supplied to each. The permeated water from the RO device and the treated water from the water softener are introduced into a water supply tank, and the water in the water supply tank is supplied to a boiler. In one aspect of Patent Document 1, when the required water supply volume of the boiler is less than the maximum water treatment volume of the RO device, raw water is supplied only to the RO device. Also, when the required water supply volume of the boiler is more than the maximum water treatment volume of the RO device, raw water is supplied to both the RO device and the water softener, and the RO permeated water and the treated water from the water softener are supplied as boiler feed water. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2017-74550 A Summary of the Invention [Problem to be solved by the invention]

[0005] As described in Patent Document 1 and other documents, it is common to change the operating status of a water treatment system or to have water treated by a separate device depending on the water quality required at the water demand point. However, there is no practice of controlling multiple water treatment devices arranged in parallel based on signals from the water demand point.

[0006] In addition, if treated water (pure water) from a wastewater recovery system is supplied to facilities that use industrial water or city water, the components (copper and iron parts) inside the equipment will corrode, increasing the risk of failure.

[0007] Furthermore, if the required amount of treated water is not supplied to the water demand location, there is a risk that the production process itself will come to a halt in factories and other facilities.

[0008] An object of the present invention is to adjust treated water in a water treatment system to optimal set water quality and water volume, and to maintain a stable operating state of the facility. [Means for solving the problem]

[0009] The water treatment system of the first invention is a water treatment system that treats raw water and supplies treated water to a demand destination, and is characterized in that it comprises a plurality of units arranged in parallel, each having a water treatment device or a valve, a raw water supply pipe and an outflow pipe connected to each of the plurality of units, and a treated water supply pipe that combines the outflow water from each outflow pipe and supplies it to the demand destination, at least one of the units is a water treatment device, and is equipped with a control device that controls the amount of raw water supplied to each unit and / or the outflow amount from each unit in accordance with the water quality required by the demand destination for the treated water.

[0010] In one aspect of the first invention, at least one of the units installed in parallel is composed of a pipe for circulating the raw water without treating it, and the valve provided in the pipe.

[0011] In one aspect of the first invention, there are multiple demand destinations, and the post-confluence treated water piping is branched so that the post-confluence treated water can be supplied to each of them, and the control device is controlled to supply treated water of the required water quality to the demand destination that issued the treated water request signal.

[0012] The water treatment system of the second invention is a water treatment system that treats raw water and supplies treated water to a demand destination, and is characterized in that it comprises a plurality of units arranged in parallel, each having a water treatment device or a valve, a raw water supply pipe and an outflow pipe connected to each of the plurality of units, and a treated water supply pipe that combines the outflow water from each outflow pipe and supplies it to the demand destination, at least one of the units is a water treatment device, and is equipped with a control device that controls the amount of raw water supplied to each unit and / or the outflow amount from each unit in accordance with the amount of treated water used by the demand destination.

[0013] In one embodiment of the second invention, at least one of the units installed in parallel is composed of a pipe for circulating the raw water without treating it, and the valve provided in the pipe.

[0014] In one embodiment of the second invention, there are multiple demand destinations, and the post-confluence treated water piping is branched so that the post-confluence treated water is supplied to each of them, and the control device is controlled to supply treated water to the demand destination that has issued a water supply request signal.

[0015] In one embodiment of the first and second inventions, a water supply request signal is sent to the control device from the demand destination, the piping after the junction, or a water tank provided for each demand destination, and control is performed by the control device based on this signal.

[0016] In one aspect of the first and second aspects of the present invention, at least two of the water treatment devices installed in parallel have different treated water qualities or treated water volumes.

[0017] In one embodiment of the first and second inventions, a water tank is provided for each demand destination, and a water level gauge is provided in each water tank, and a water supply request signal is transmitted when the water level detected by the water level gauge drops to a specified lower water level.

[0018] In one aspect of the first and second aspects of the present invention, a water supply valve is provided for each of the demand destinations, and the water supply valve of the demand destination that has issued a water supply request is opened.

[0019] In one aspect of the first and second aspects of the invention, a line is provided for returning the combined treated water to the upstream side of the unit. Effect of the Invention

[0020] According to the water treatment system of the present invention, treated water of the required quality or amount can be stably supplied to a location where water is required. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a flow diagram of a water treatment system according to an embodiment. [Diagram 2] FIG. 2 is a flow diagram of a water treatment system according to an embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, an embodiment will be described with reference to the drawings. 1 is a flow diagram of a water treatment system according to a first embodiment. Wastewater is introduced into a wastewater recovery tank 1. The wastewater in the wastewater recovery tank 1 can be sent to water treatment units 7 and 8 and a flow control valve 10 via a pump 2 and branch pipes 3, 4, and 6 connected to the discharge side of the pump 2. A water treatment unit may be installed instead of the flow control valve 10. Note that, although recovered wastewater is used as raw water in this embodiment, raw water is not limited to wastewater, and may be river water, groundwater, tap water, industrial water, biologically treated water, or the like.

[0023] Water treatment units include membrane (RO membrane, UF membrane, MF membrane, decarbonation membrane, etc.) treatment equipment (water quality: industrial water to pure water level, required water volume: small to large), ion exchange resin equipment (water quality: industrial water to pure water level, required water volume: small to large), electric deionization equipment (water quality: industrial water to pure water level, required water volume: small to large), coagulation sedimentation equipment (water quality: industrial water to city water level, required water volume: small to large), (coagulation) pressure flotation equipment (water quality: industrial water to city water level, required water volume: small to large), pressure / gravity filtration equipment (water quality: industrial water to city water level, required water volume: small to large), heating / cooling equipment (water quality: industrial water to pure water level, required water volume: small to large), Any of the following are acceptable: decarbonation / deaeration equipment (water quality: pure water level; required water volume: small to large), (biological) activated carbon filtration equipment (water quality: industrial water to city water level; required water volume: small to large), catalytic resin equipment (water quality: industrial water to pure water level; required water volume: small to large), UV sterilization / oxidation equipment (water quality: industrial water to pure water level; required water volume: small to large), ozone oxidation treatment equipment (water quality: industrial water to pure water level; required water volume: small to large), biological contact oxidation treatment equipment (water quality: industrial water to city water level; required water volume: small to large), ammonia stripping equipment (water quality: industrial water to city water level; required water volume: small to large), etc.

[0024] The water treatment units installed in parallel may be of the same type or different types. In the case of the same type of equipment, the treatment capacities may be different or the same. In this example, two water treatment units 7 and 8 are arranged in parallel, but three or more units may be arranged in parallel.

[0025] The outflow water from the water treatment units 7, 8 and the flow control valve 10 (the permeate water if the water treatment units 7, 8 are membrane treatment devices such as RO devices) can be introduced into a treated water tank 16 via pipes 11, 12, 14 and a junction pipe 15 where the pipes 11, 12, 14 join together. An addition device for adding a chemical solution such as sodium hypochlorite may be installed in the junction pipe 15.

[0026] The treated water in the treated water tank 16 can be introduced into water receiving tanks 31 , 32 , and 33 via a pump 17 , a pipe 18 , branch pipes 19 , 20 , and 21 , and water supply valves 23 , 24 , and 25 .

[0027] The water in the water tank 31 can be supplied to a pit 37 of a scrubber 36 for purifying exhaust gas via a pump 34 and a pipe 35. The water in the pit 37 is supplied to a water spray nozzle 40 via a pump 38 and a pipe 39.

[0028] Water sprayed from the spray nozzles 40 comes into contact with the exhaust gas rising inside the scrubber 36, purifying the exhaust gas (capturing fine particles, absorbing water-soluble components, etc.), and the purified gas flows out from the top of the scrubber 36. The operation of the pump 34 is controlled so that the water level detected by a water level sensor (not shown) in the pit 37 is within a predetermined range.

[0029] The quality of the water in this water receiving tank 31 (scrubber supply water) required is at the pure water level (electrical conductivity of about 0.05 to 1 mS / m).

[0030] The water tank 32 is a water tank for general purpose water. The water in the water tank 32 is pumped to a water demand point such as a toilet via a pump 41 and a pipe 42, and the surplus water is returned to the water tank 32 via a pipe 43. The water in the water tank 32 can also be pumped to a fire water tank via a pump 44 and a pipe 45.

[0031] The quality of the water (miscellaneous water) in this water receiving tank 32 must be at city water level (electrical conductivity of about 10 to 20 mS / m).

[0032] The water receiving tank 33 is an elevated water tank installed at a high position, and the water in the water receiving tank 33 can be fed to a water supply valve 49 of a cooling tower 48 via a pipe 47 by means of hydraulic head pressure. However, a water supply method using a pump may also be used. The water supply valve 49 may be a ball tap, or may be controlled to open and close so that the water level in a pit at the bottom of the cooling tower 48 detected by a water level sensor (not shown) is within a predetermined range. A plurality of cooling towers 48 may be installed.

[0033] The quality of the water in this water receiving tank 33 (cooling tower make-up water) is required to be industrial water level (electrical conductivity of about 10 to 30 mS / m) to pure water level (electrical conductivity of about 0.05 to 1 mS / m).

[0034] In this water treatment system, the instrumentation system includes a water quality meter (in this embodiment, a conductivity meter EC, but it may be one or more of a water temperature meter, turbidity meter, pH meter, TOC meter, silica meter, particulate meter, DO meter, ORP meter, COD meter, residual chlorine meter, fluorine meter, boron meter, sulfate concentration meter, nitrogen meter, phosphorus meter, ammonia meter, etc.) provided in piping 15, and water level gauges WL provided in each of the water receiving tanks 31-33, and detection signals from these are input to a controller 51. Based on the input signals, controller 51 controls pump 2, water treatment units 7, 8, and flow control valve 10, as well as pump 17 and water supply valves 23-25.

[0035] The water supply valves 23-25 ​​are controlled to open when the water levels in the water receiving tanks 31-33 drop to a specified lower limit level, and to close when the water levels in the water receiving tanks 31-33 rise to a specified upper limit level.

[0036] The controller 51 also controls the operation (start / stop and operating water volume) of the water treatment units 7, 8 and the flow control valve 10 so that the conductivity detected by the conductivity meter EC serving as a water quality meter falls within a set range.

[0037] In this embodiment, water is sent from each of the water receiving tanks 31, 32, 33 depending on the operating status of the demand destinations, that is, the scrubber 36, the general service water system, and the cooling tower 48, and the water levels in the water receiving tanks 31, 32, 33 decrease. Then, a water level lower limit signal (water supply request signal) is sent to the controller 51 from the water level meter WL of the water receiving tank 31, 32 or 33 whose water level has fallen to the lower limit.

[0038] The demand destination is not limited to the above, but may be any of the following, or may be other than these. Boiler (water quality: pure water level; required water volume: medium to large), outdoor air conditioning unit (water quality: industrial water to city water level; required water volume: small to large), cooling tower (water quality: industrial water to city water level; required water volume: small to large), scrubber (water quality: city water to pure water level; required water volume: small to large), utility water (toilets, sprinklers, heat storage tank water supply, fire water tank water supply, etc.): (water quality: industrial water to city water level; required water volume: small to medium)), water for diluting chemicals (water quality: city water to pure water level; required water volume: small), hot and cold water supply (water quality: industrial water to city water level; required water volume: small to medium).

[0039] Since the required water quality (conductivity in this embodiment) at each demand destination differs as described above, the controller 51 sets the target conductivity of the demand destination to which the water supply request signal was sent as the target treated water quality (target conductivity of the conductivity meter EC). Then, the number of operating water treatment units 7, 8, the amount of treated water, and the flow rate of the flow control valve 10 (including full closure) are controlled so that the conductivity detected by the conductivity meter EC becomes the target conductivity. Note that when the required water quality of the demand destination is low (when high conductivity is acceptable), it is preferable to open the valve 10 as much as possible to reduce the load on the water treatment units 7, 8.

[0040] If a water supply request signal is sent from one receiving tank while water is being supplied to that receiving tank in response to a water supply request signal from the other receiving tank, after the water supply to the first receiving tank is completed, water is supplied to the other receiving tank in the same manner. In other words, in response to the water supply request signal from the other receiving tank, treated water having the required conductivity for that receiving tank is produced and supplied to that receiving tank.

[0041] FIG. 2 is a flow diagram of a water treatment system according to another embodiment. In this embodiment, a water treatment unit 9 is further installed in parallel with the water treatment units 7 and 8. The water treatment units 7 to 9 are the same type of device but have different treatment capacities. In this embodiment, the treatment capacities of the water treatment units 7 to 9 are large for the water treatment unit 7, medium for the water treatment unit 8, and small for the water treatment unit 9.

[0042] In this embodiment, a flow meter FI is provided instead of a water quality meter.

[0043] In addition, a pipe (line) 53 is provided for returning a part of the treated water from the discharge side pipe 18 of the pump 17 to the wastewater recovery tank 1, and a valve 54 is provided on this pipe 53. An automatic three-way valve may be provided at the branch of the pipe 53 from the pipe 18. Even if the water demand at the demand destination is extremely low, when it is necessary to secure a minimum amount of treated water due to the characteristics of the water treatment units 7 to 9, the valve 54 is opened and a part of the treated water sent from the pump 17 is returned to the recovery wastewater tank 1 via the pipe 53. This line 53 may also be provided in FIG. 1. If there is a pipe 53 for returning, water can be sent to the tanks 31, 32, and 33 by the residual pressure of the junction pipe 15 even if the tank 16 and the pump 17 are not present, and when the water supply valves 23, 24, and 25 are closed, water can be returned to the tank 1 via the pipe 53, so the tank 16 and the pump 17 are not essential.

[0044] The other configuration is similar to that in FIG. 1, and the same reference numerals denote the same parts.

[0045] In the embodiment of Fig. 2, a target value for the flow rate detected by the flow meter FI is set based on the planned amount of water to be sent to the water tank 31, 32, or 33 that issued the water supply request signal. Then, the number of operating water treatment units 7-9, the amount of treated water, or the flow rate of the flow control valve 10 is controlled so that the flow rate detected by the flow meter FI becomes this target flow rate. In the embodiment of Fig. 2 as well, a water treatment unit may be installed in place of the flow control valve 10.

[0046] In each of the above embodiments, control is performed according to either the water quality or the water volume required by the demand destination, but control may also be performed according to both the water quality and the water volume required by the demand destination.

[0047] In each of the above embodiments, water tanks 31 to 33 are installed, but the water tanks 31 to 33 may be omitted and a water supply control valve may be installed instead, and the water supply to the demand destination may be controlled by controlling the water supply control valve. [Explanation of symbols]

[0048] 1 Wastewater collection tank 7,8,9 Water Treatment Unit 16 Treatment tank 31, 32, 33 Water tank 36 Scrubber 48 Cooling Tower

Claims

1. In a water treatment system that treats raw water and supplies treated water to multiple demand destinations, A plurality of parallel-arranged water treatment devices or units each having a valve; a raw water supply pipe and an outflow pipe connected to each of the plurality of units; a treated water supply pipe that combines the outflow water from each outflow pipe and delivers it to the consumer; Equipped with At least one of the units is a water treatment device; A water treatment system including a control device for controlling the amount of raw water supplied to each unit and / or the amount of outflow from each unit according to the required water quality of the treated water at the demand destination, A water tank is provided for each of the demand destinations, and each water tank is provided with a water level meter. When the water level detected by the water level meter falls to a specified lower water level, a water supply request signal is transmitted. In response to the transmission of the water supply request signal, the water treatment unit or valve is operated to produce treated water of the required water quality for the water receiving tank and supply the treated water to the water receiving tank; This water treatment system is characterized in that when a water supply request signal is transmitted from another water tank while water is being supplied to the water tank, water is supplied to the other water tank after the water supply to the water tank is completed.

2. The water treatment system according to claim 1, characterized in that at least one of the units installed in parallel is composed of a pipe for circulating the raw water without treating it, and the valve provided on the pipe.

3. A water treatment system according to claim 1 or 2, characterized in that a post-confluence treated water piping is branched so that the post-confluence treated water can be supplied to each of the multiple demand destinations, and the control device controls the demand destination that has issued a treated water request signal to supply treated water of the required water quality to the demand destination.

4. In a water treatment system that treats raw water and supplies treated water to multiple demand destinations, A plurality of parallel-arranged water treatment devices or units each having a valve; a raw water supply pipe and an outflow pipe connected to each of the plurality of units; a treated water supply pipe that combines the outflow water from each outflow pipe and delivers it to the consumer; Equipped with At least one of the units is a water treatment device; A water treatment system including a control device for controlling the amount of raw water supplied to each unit and / or the amount of outflow from each unit according to the amount of treated water used by the demand destination, A water tank is provided for each of the demand destinations, and each water tank is provided with a water level meter. When the water level detected by the water level meter falls to a specified lower water level, a water supply request signal is transmitted. In response to the transmission of the water supply request signal, the water treatment unit or valve is operated to produce treated water of the required water quality for the water receiving tank and supply the treated water to the water receiving tank; This water treatment system is characterized in that when a water supply request signal is transmitted from another water tank while water is being supplied to the water tank, water is supplied to the other water tank after the water supply to the water tank is completed.

5. 5. The water treatment system according to claim 4, wherein at least one of the units installed in parallel is composed of a pipe for circulating the raw water without treating it, and the valve provided in the pipe.

6. A water treatment system according to claim 4 or 5, characterized in that the treated water piping after the junction is branched so that the treated water after the junction is supplied to each of the multiple demand destinations, and the control device controls the system to supply the treated water to the demand destination that has issued a water supply request signal.

7. A water treatment system according to any one of claims 1 to 6, characterized in that a water supply request signal is sent to the control device from the demand destination, the piping after the junction, or a water tank provided for each demand destination, and control by the control device is performed based on this signal.

8. 8. The water treatment system according to claim 1, wherein at least two of the water treatment devices installed in parallel have different treated water qualities or treated water volumes.

9. 9. The water treatment system according to any one of claims 1 to 8, wherein a water supply valve is provided for each of the demand destinations, and the water supply valve of the demand destination that has issued a water supply request is opened.

10. 10. The water treatment system according to any one of claims 1 to 9, further comprising a line for returning the combined treated water to the upstream side of said unit.

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