Water treatment apparatus and water treatment method

Abstract

To provide a water treatment device and a water treatment method capable of detecting an appropriate timing to replace activated carbon.SOLUTION: A water treatment device according to one embodiment of the present invention includes: an activated carbon filtration device including a filtration tank containing a filtration material containing activated carbon; and a control unit that calculates an amount of removed chlorine on the basis of temperature, a chlorine concentration, and an integrated flow rate of a fluid passing through the activated carbon filtration device.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a water treatment apparatus and a water treatment method.

Background Art

[0002] In a water treatment apparatus that filters raw water supplied from a water source such as a well, iron and manganese contained in well water are oxidized by sodium hypochlorite and removed by a filter medium filled in a filtration device. Since normal treatment cannot be performed when the chlorine required for iron and manganese removal treatment is insufficient, it is necessary to add chlorine so that a certain amount of chlorine is surplus on the secondary side of the filtration device. However, when the surplus chlorine concentration is high, it may interfere with direct use. Also, when the surplus chlorine concentration is low, normal treatment may not be performed because the chlorine concentration required for treatment becomes insufficient when the concentrations of iron and manganese in the raw water fluctuate. As a countermeasure, the iron and manganese removal treated water containing a sufficient surplus chlorine concentration is passed through an activated carbon filtration device to remove chlorine. [[ID=I4]]

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In such a water treatment apparatus, the removal ability of activated carbon is limited. When the limit is reached, chlorine suddenly flows out into the treated water. Therefore, it is necessary to replace the activated carbon at an appropriate time before the removal ability of the activated carbon decreases. Since the chlorine removal ability of activated carbon varies greatly depending on the water temperature, it is difficult to determine the replacement time of the activated carbon, and it is difficult to reduce the cost of the activated carbon and the replacement work.

[0005] Therefore, the embodiment of the present invention aims to provide a water treatment apparatus and a water treatment method that can detect the appropriate time for replacing activated carbon. [Means for solving the problem]

[0006] A water treatment apparatus according to one embodiment of the present invention comprises an activated carbon filter apparatus having a filter tank containing a filter material containing activated carbon, and a control unit that calculates the amount of chlorine to be removed based on the temperature of the fluid passing through the activated carbon filter apparatus, the chlorine concentration, and the cumulative flow rate.

[0007] The control unit, Mn of Chlorine removal amount per unit integrated flow rate, V of Unit integrated flow rate, C of Raw water chlorine concentration, Kn of Temperature correction coefficient, hand The amount of chlorine removed per unit integrated flow rate is calculated using the formula Mn = V × C × Kn. The total amount of chlorine removed per unit cumulative flow rate is calculated as M1 + M2 + M3 + … + Mn, and The amount of residual chlorine removed is calculated by subtracting the cumulative amount of chlorine removed from the standard amount of chlorine removal. The aforementioned If the amount of residual chlorine removed falls below the residual standard value, or, The aforementioned If the cumulative amount of chlorine removed exceeds the removal standard value, notification processing, alert processing, or communication processing will be performed. Based on a second standard value lower than the first standard value, if the amount of residual chlorine removed is less than or equal to the second standard value, the supply of treated water to the secondary side of the activated carbon filter is stopped. [Effects of the Invention]

[0008] According to the present invention, it is possible to provide a water treatment apparatus and a water treatment method that can detect the appropriate time for replacing activated carbon. [Brief explanation of the drawing]

[0009] [Figure 1] An explanatory diagram showing the configuration of a water treatment apparatus according to a first embodiment of the present invention. [Figure 2]Explanatory drawing showing the configuration of the control system in the water treatment apparatus according to the embodiment. [Figure 3] Flowchart showing the control flow of the water treatment apparatus according to the embodiment. [Figure 4] Graph showing the integrated chlorine removal amount at an average water temperature of 14.5 °C in the water treatment apparatus according to the embodiment. [Figure 5] Graph showing the integrated chlorine removal amount at an average water temperature of 22.8 °C in the water treatment apparatus according to the embodiment. [Figure 6] Graph showing the relationship between the temperature and the integrated chlorine removal amount in the water treatment apparatus according to the embodiment. [Figure 7] Explanatory drawing of the temperature correction coefficient.

Mode for Carrying Out the Invention

[0010] Hereinafter, a water treatment apparatus 1 and a water treatment method according to an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is an explanatory drawing showing the configuration and flow of the water treatment apparatus 1 according to the present embodiment, and FIG. 2 is an explanatory drawing showing the configuration of the control unit 26 and the communication terminal 100 of the water treatment apparatus 1. FIG. 3 is a flowchart of the notification process. FIGS. 4 and 5 are graphs showing the integrated chlorine removal amounts when the average water temperature in the water treatment apparatus is 14.5 °C and 22.8 °C. FIG. 6 is a graph showing the relationship between the temperature and the integrated chlorine removal amount, and FIG. 7 is an explanatory drawing of the temperature correction coefficient.

[0011] As shown in FIGS. 1 and 2, the water treatment apparatus 1 includes a raw water pump 11 provided at a raw water supply source 10, a first chemical injection device 12A, a first filtration device 13, a second filtration device 14, a second chemical injection device 12B, a treatment water tank 15, a backwash pump 16 connected to the treatment water tank 15, a water supply pump 50, a treatment water channel 17, a backwash water channel 18, drain channels 19a to 19c, 20a to 20c, a flow sensor 23 as a flow rate detection unit, a water temperature sensor 24 as a temperature detection unit, and a control unit 26.

[0012] The water treatment device 1 injects a chemical solution into raw water from a supply source with the chemical solution injection device 12A, removes iron and manganese contained in the raw water with the first filtration device 13, and is formed to be able to remove solid substances such as sand present in the raw water. Further, the water treatment device 1 reduces the chlorine concentration of the first treated water from which iron and manganese have been removed by the first filtration device 13 with the second filtration device 14, and adjusts the chlorine concentration by injecting chlorine again with the chemical solution injection device 12B into the second treated water from which chlorine has been removed by the second filtration device 14.

[0013] The treatment water passage 17 includes a plurality of water passageways formed of piping members. The treatment water passage 17 includes a raw water passage 17a from the supply source 10 to the chemical solution injection device 12A, a supply passage 17b from the chemical solution injection device 12A to the first filtration device 13, a passage 17c to the second three-way valve 43 on the primary side of the treatment flow path, a first treatment water passage 17d from the first filtration device 13 to the second filtration device 14, a passage 17e to the three-way valve 46 arranged on the secondary side of the treatment flow path, a second treatment water passage 17f from the second filtration device 14 to the treatment water tank 15, and a water supply passage connected to the water supply destination through the treatment water tank 15. During the filtration treatment, water from the supply source 10 is sent to the water supply destination through the chemical solution injection device 12A, the first filtration device 13, the second filtration device 14, the chemical solution injection device 12B, and the treatment water tank 15 by the raw water pump 11.

[0014] The backwash water passage 18 includes a plurality of water passageways formed of piping members. The backwash water passage 18 constitutes two systems of flow paths branched from the treatment water tank 15 and connected to the first filtration device 13 and the second filtration device 14 respectively. In the backwash treatment, water in the treatment water tank 15 is sent to the first filtration device 13 or the second filtration device 14 through the backwash water passage 18 by the backwash pump 16.

[0015] The drain passage includes a plurality of water passageways formed of piping members. It includes a backwash drain passage 19a connected from the port P3 to the backwash drain D1 as the first drain passage, a cleaning drain passage 19b connected from the port P9 to the cleaning drain D2, and a test drain passage 19c branched from the first treatment water passage 17d and connected to the test drain D3.

[0016] Furthermore, the drainage channel includes, as a second drainage channel, a backwash drainage channel 20a connected from port P13 to backwash drain D11, a washing drainage channel 20b connected from port P19 to washing drain D12, and a test drainage channel 20c branching off from the second treatment channel 17f and connected to the test drain D13.

[0017] A check valve S1 and on-off valves S2 to S17 are provided at predetermined locations in each flow path. The check valve S1 restricts the flow in one direction. The on-off valves S2 to S17 are, for example, electromagnetic on-off valves, and they switch the connection state of multiple flow paths by opening and closing in accordance with the control of the processor 61.

[0018] The supply source 10 is, for example, a well. A raw water pump 11 is installed at the supply source 10.

[0019] The raw water pump 11 comprises a pump and a motor that drives the pump. The raw water pump 11 sends water from the supply source 10 to the secondary side in the treated water channel 17. The raw water pump 11 may be, for example, a surface pump or a submersible pump.

[0020] The chemical injection devices 12A and 12B each include a chemical tank 21, an injection pump 22, and a flow rate detection device. The chemical injection devices 12A and 12B inject a predetermined amount of chemical into the treated water channel 17. The first chemical injection device 12A is located on the secondary side of the raw water pump 11 and is installed in the raw water channel 17a, which is the primary water channel of the first filtration device 13. The second chemical injection device 12B is located on the secondary side of the second filtration device 14 and is installed in the second treated water channel 17f, which is the primary water channel of the treated water tank 15.

[0021] The chemical tank 21 stores a chemical solution containing an oxidizing agent, specifically sodium hypochlorite. The injection pump 22 is a diaphragm pump driven by, for example, a solenoid. The injection pump 22 is connected to the chemical tank 21 and injects a predetermined amount of the chemical solution into the treatment water channel 17.

[0022] The first filtration device 13 comprises a filtration tank 31, a suction pipe 32, a recovery pipe 33, and a flow path switching unit 34 as a flow path switching means.

[0023] The filtration tank 31 is configured in a cylindrical shape, for example, having an upper wall, a lower wall, and a peripheral wall. The filtration tank 31 includes a filter material section and a gravel section as a support layer located below the filter material section. The filter material section is composed of multiple types of filter materials stacked together. One of the multiple filter materials is configured to remove iron from raw water into which a chemical solution has been injected. Another of the multiple filter materials is configured to remove manganese from raw water into which a chemical solution has been injected. Another of the multiple filter materials is configured to remove solid matter contained in the raw water.

[0024] The suction pipe 32 is connected to the filter tank 31. One end of the suction pipe 32 is connected to the flow path switching unit 34, and the other end of the suction pipe 32 is positioned above the filter tank 31, for example, above the uppermost layer of multiple filter materials.

[0025] The recovery pipe 33 is connected, for example, to the filtration tank 31. One end of the recovery pipe 33 is connected to the flow path switching unit 34, and the other end is positioned below the filtration tank 31, for example, below the lowest layer of multiple filter materials. The other end of the recovery pipe 33 is positioned, for example, at the gravel layer. That is, the recovery pipe 33 extends vertically upward from the lower end of the filtration tank 31, and the lower end of the pipe is positioned near the bottom surface of the filtration tank 31. A recovery port equipped with a filter is provided at the lower end of the recovery pipe 33. The upper end of the pipe is connected to the flow path switching unit 34 and is configured to be connectable to multiple flow paths, and the connection destination and open / closed state can be switched.

[0026] The flow path switching unit 34 includes, for example, three three-way valves 41, 42, and 43 to switch the connection state of multiple flow paths. The three-way valves 41, 42, and 43 are solenoid valves connected to the control unit 26, and are configured to allow switching of the connection destination and open / closed state. Each of the three-way valves 41, 42, and 43 has three ports P1-P3, P4-P6, and P7-P9, and the control unit 26 switches the internal flow path to connect any two of these ports. For example, in the flow path switching unit 34, it is also possible to omit the three-way valve 43 and switch the flow path using only the two three-way valves 41 and 42.

[0027] The flow path switching unit 34 switches the connection status of the primary side treatment channel 17b, backwash channel 18, suction pipe 32, recovery pipe 33, secondary side treatment channels 17c and 17d, backwash drain channel 19a, and washing drain channel 19b using three three-way valves 41, 42, and 43.

[0028] The three-way valve 41 has three ports P1, P2, and P3 which are connected to the supply-side treated water channel 17b, the suction pipe 32, and the backwash drain channel 19a, respectively, and two of these channels are connected by opening and closing the ports. The first three-way valve 41 connects, for example, the supply channel 17b to the suction pipe 32, or the suction pipe 32 to the backwash drain channel 19a.

[0029] The three-way valve 42 has ports P4, P5, and P6 which are connected to the backwash channel 18, the recovery pipe 33, and the channel 17c leading to the three-way valve 43 located on the secondary side of the treatment channel, respectively, and two of these channels are connected by opening and closing the ports. The second three-way valve 42 connects, for example, the recovery pipe 33 to the channel 17c, or the backwash channel 18 to the recovery pipe 33.

[0030] The three-way valve 43 has three ports P7, P8, and P9 that are connected to the flow path 17c leading to the second three-way valve 42 on the primary side of the treatment flow path, the first treatment water channel 17d which is the secondary flow path, and the wash drainage channel 19b on the test drainage side, respectively, and two of these flow paths are connected by opening and closing the ports. The three-way valve 43 connects, for example, the flow path 17c to the first treatment water channel 17d, or the flow path 17c to the wash drainage channel 19b.

[0031] The second filtration device 14 comprises a filtration tank 35, a suction pipe 36, a recovery pipe 37, and a flow path switching unit 38 as a flow path switching means.

[0032] The filtration tank 35 contains a filter material and is configured to allow water to pass through. The filtration tank 35 is configured in a cylindrical shape, for example, having an upper wall, a lower wall, and a peripheral wall. The filter material comprises at least activated carbon and is configured to remove chlorine from the first treated water. As an example, activated carbon as the filter material and gravel placed below the activated carbon are arranged inside the filtration tank 35.

[0033] The suction pipe 36 is connected to the filtration tank 35. One end of the suction pipe 36 is connected to the flow path switching unit 38, and the other end of the suction pipe 36 is positioned above the uppermost layer of the multiple filter materials.

[0034] The recovery pipe 37 is connected to the filtration tank 35. One end of the recovery pipe 37 is connected to the flow path switching unit 38, and the other end is positioned below the lowest layer of multiple filter materials. That is, the recovery pipe 37 extends vertically upward from the lower end of the filtration tank 35, and the lower end of the pipe is positioned near the bottom surface of the filtration tank 35. A recovery port equipped with a filter is provided at the lower end of the recovery pipe 37. The upper end of the pipe is connected to the flow path switching unit 38 and is configured to be connectable to multiple flow paths, and the connection destination and open / closed state can be switched.

[0035] The flow path switching unit 38 comprises three three-way valves 44, 45, and 46. The flow path switching unit 38 switches the connection state of multiple flow paths. Three-way valve 44 as the first flow path switching valve, three-way valve 45 as the second flow path switching valve, and three-way valve 46 as the third flow path switching valve are solenoid valves, and are ball valves in which the flow path is switched by the rotation of an internal ball. Three-way valves 44, 45, and 46 are connected to the control unit 26 and configured to be switchable between open and closed states. Three-way valves 44, 45, and 46 each have three ports, and the control unit 26 switches the internal flow path to connect any two of these ports. For example, in the flow path switching unit 38, it is also possible to omit three-way valve 46 and switch the flow path using the two three-way valves 44 and 45.

[0036] The three-way valve 44 has three ports P11, P12, and P13 which are connected to the supply-side first treatment channel 17d, the suction pipe 36, and the discharge-side backwash drain channel 20a, respectively, and two of these channels are connected by opening and closing the ports. The three-way valve 44 connects, for example, the first treatment channel 17d to the suction pipe 36, or the suction pipe 36 to the backwash drain channel 20a.

[0037] The three-way valve 45 has ports P14, P15, and P16 that are connected to the recovery pipe 37, the backwash channel 18, and the channel 17e leading to the three-way valve 46 located on the secondary side of the treatment channel, respectively, and two of these channels are connected by opening and closing the ports. The three-way valve 45 connects, for example, the recovery pipe 37 to the channel 17e, or the backwash channel 18 to the recovery pipe 37.

[0038] The three-way valve 46 has three ports P17, P18, and P19 that are connected to the flow path 17e leading to the three-way valve 45 on the primary side of the treatment flow path, the second treatment water channel 17f on the secondary side, and the wash drainage channel 20b on the test drainage side, respectively, and two of these flow paths are connected by opening and closing the ports. The three-way valve 46 connects, for example, the flow path 17e to the second treatment water channel 17f, or the flow path 17e to the wash drainage channel 20b.

[0039] The second flow path switching unit 38 switches the connection state of the flow paths between the first treatment channel 17d, the backwash channel 18, the suction pipe 36, the recovery pipe 37, the secondary flow path 17e, the backwash drain channel 20a, and the washing drain channel 20b using three three-way valves 44, 45, and 46.

[0040] Specifically, the fourth three-way valve 44 has three ports P11, P12, and P13 connected to the first treatment channel 17d on the supply side, the suction pipe 36, and the backwash drain channel 20a on the discharge side, and two of these channels are connected by opening and closing the ports. The fifth three-way valve 45 has ports P14, P15, and P16 connected to the backwash channel 18, the recovery pipe 37, and the channel 17e leading to the sixth three-way valve 46 located on the secondary side of the treatment channel, and two of these channels are connected by opening and closing the ports. The sixth three-way valve 46 has three ports P17, P18, and P19 connected to the channel 17e leading to the fifth three-way valve 45 on the primary side of the treatment channel, the washing drain channel 20b on the discharge side, and the second treatment channel 17f on the secondary side, and two of these channels are connected by opening and closing the ports.

[0041] The treated water tank 15 is a container configured to store treated water that has passed through the second filtration device 14. The treated water tank 15 is equipped with a liquid level sensor that detects the liquid level of the treated water. The liquid level sensor is connected to the processor 61 via a signal line. The liquid level sensor detects the liquid level of the treated water and sends the liquid level information as an electrical signal to the processor 61.

[0042] The backwash pump 16 comprises a motor and a pump section having an impeller connected to the motor. The backwash pump pressurizes the water from the treated water tank 15 and pumps it to the secondary water supply destination.

[0043] The water supply pump 50 comprises a motor and a single-stage or multi-stage pump section having an impeller connected to the motor. The water supply pump 50 pressurizes the water from the treated water tank 15 and pumps it to the secondary water supply destination.

[0044] The flow sensor 23 is installed in the treatment channel 17 and detects the flow rate of the fluid passing through the treatment channel 17, and sends the detected flow rate information to the control unit 26. For example, various types of sensors such as impeller type and ultrasonic type can be used as the flow sensor 23. The flow sensor 23 has a function to transmit flow rate information to the outside. As an example, in this embodiment, the flow sensor 23 is installed on the secondary side of the second filtration device 14 and on the primary side of the second chemical injection device 12B. Alternatively, the flow rate information may be obtained using the flow rate signal from the flow rate detection device located in the chemical injection devices 12A and 12B.

[0045] The water temperature sensor 24 is installed in the primary flow path of the second filtration device 14 and detects the temperature of the fluid supplied to the second filtration device 14, and sends the detected temperature information to the control unit 26. The water temperature sensor 24 is, for example, an IC temperature sensor and has the function of transmitting temperature information to the outside. In this embodiment, for example, the water temperature sensor 24 is installed on the primary side of the second filtration device 14. However, the water temperature sensor 24 may also be installed on the secondary side of the second filtration device 14.

[0046] The control unit 26 includes a processor 61 that controls the operation of each part based on a predetermined program, a memory 62 that stores various data, a communication unit 63, an input unit 64, a display unit 65, and an interface 66. The input unit 64 and the display unit 65 may be composed of displays and input buttons individually provided in each pump device, first filtration processing unit, and second filtration processing unit of the water treatment device.

[0047] For example, the processor 61 performs various calculations based on the detected values ​​from each sensor and controls the motors of each pump 11, 16, and 50 to operate at a variable speed or stop. The processor 61 is typically a microcontroller, but may also be a CPU (Central Processing Unit), FPGA (Field Programmable Gate Array), DSP (Digital Signal Processor), or other general-purpose or dedicated processor. The processor 61 performs arbitrary processing such as communication control, display control, and pump control. The processor 61 includes, for example, a processing circuit and memory. The processor 61 is connected to each part of the water treatment device 1 via, for example, an interface 66, and is connected to an external terminal via a communication unit 63.

[0048] The processor 61 acquires operating data indicating the operating status of the water treatment device 1 based on detection signals from various sensors and stores the operating data in the memory 62. The acquisition of operating data may also include calculating the operating data according to the actual operating conditions of the water treatment device 1, such as by accumulating values.

[0049] Specifically, for example, the processor 61 controls the operation of pumps 11, 16, 50, and 22 by controlling the inverters corresponding to each pump 11, 16, 50, and 22.

[0050] Furthermore, the processor 61 performs various calculations based on, for example, detected values ​​detected by sensors and operation inputs, and switches the connection state of the flow paths by controlling the opening and closing of multiple valves 41-46 provided in the flow path switching units 34 and 38, which serve as flow path switching means, as well as the check valve S1 and on-off valves S2-S17 arranged in each flow path.

[0051] The water treatment device 1 performs multiple types of treatment by switching these flow paths and controlling the operation of pumps 11 and 16. Specifically, the water treatment device 1 performs filtration, backwashing, and washing under the control of the processor 61.

[0052] Furthermore, the processor 61 performs various calculations based on, for example, detected values ​​and operation inputs detected by sensors, and switches the connection state of the flow path by controlling the opening and closing of the ports of the flow path switching units 34 and 38, as well as the check valve S1 and on-off valves S2 to S17.

[0053] Furthermore, when performing the filtration process described above, the processor 61 detects information on the chlorine removal performance of the activated carbon and performs a notification process if the remaining capacity of the activated carbon is insufficient.

[0054] The processor 61 detects chlorine removal performance information based on flow rate information and chlorine concentration information. Specifically, for example, it calculates the cumulative flow rate based on the flow rate value detected by the flow sensor 23. Then, it calculates the cumulative chlorine removal amount based on the cumulative flow rate and chlorine concentration information. For example, cumulative chlorine removal amount [g] = cumulative flow rate [L] × chlorine concentration [g / L].

[0055] Figures 4 and 5 are graphs showing the relationship between cumulative flow rate and residual chlorine concentration. In Figures 4 and 5, the correspondence between residual chlorine concentration in the raw water (first treated water) and treated water (second treated water), cumulative chlorine removal amount, and water temperature is shown for each elapsed time and cumulative flow rate. According to Figures 4 and 5, it can be seen that the cumulative chlorine removal amount (lifespan of activated carbon) until a certain concentration of residual chlorine leaks into the treated water (second treated water) changes with water temperature. For example, in Figure 4, the cumulative chlorine removal amount is approximately 1000g when the average water temperature is 14.5℃, and even with the same flow rate, in Figure 5, the cumulative chlorine removal amount is approximately 2900g when the average water temperature is 22.8℃, showing that the chlorine removal capacity of activated carbon increases as the water temperature rises.

[0056] For example, processor 61 calculates the amount of chlorine removed per unit integrated flow rate based on the following formula (1). Here, Mn is the amount of chlorine removed per unit integrated flow rate [L], V is the unit integrated flow rate, C is the raw water chlorine concentration, and Kn is the temperature correction coefficient. M n = V × C × k n (1) Here, Mn = V × C × kn Mn: Chlorine removal amount per unit integrated flow rate [g] V: Unit integrated flow rate [L] C: Raw water chlorine concentration [g / L] kn: This is the temperature correction coefficient. For example, the temperature correction coefficient kn is calculated using the average water temperature per unit volume flow rate. For example, the average water temperature is obtained based on data input from the water temperature sensor 24.

[0057] As shown in equation (2), the total amount of chlorine removed per unit integrated flow rate is defined as the integrated chlorine removal amount. Cumulative chlorine removal amount = M1 + M2 + M3 + ... + Mn ... (2)

[0058] Furthermore, the processor 61 calculates the amount of residual chlorine to be removed based on equations (1) and (2). That is, it calculates the amount of residual chlorine to be removed by subtracting the cumulative amount of chlorine to be removed using the cumulative flow rate from the standard amount of chlorine removal of the filtration device (maximum amount of chlorine to be removed) stored in memory or input.

[0059] The unit integrated flow rate is the cumulative value of the filtration flow rate over a certain period of time (unit time). In other words, it is the volume of fluid that passed through the second filtration device in a certain period of time. The chlorine removal amount per unit integrated flow rate is an estimated value of the amount of chlorine removed in that unit time, and is calculated by multiplying the flow rate that passed through in that unit time by the raw water chlorine concentration and the temperature correction coefficient K. n It is calculated by multiplying by .

[0060] Here, the temperature correction coefficient K n This value is calculated based on the relationship between water temperature and unit integrated flow rate, using the average water temperature per unit integrated flow rate (a value obtained based on data input from a water temperature sensor).

[0061] Figure 6 is a graph showing the relationship between water temperature and cumulative chlorine removal, indicating the cumulative chlorine removal amount (activated carbon lifespan) for each water temperature. Figure 7 is an explanatory diagram of water temperature and the temperature correction coefficient Kn. As a method for calculating the temperature correction coefficient Kn, the relationship between cumulative chlorine removal amount and water temperature is obtained from multiple data points of cumulative chlorine removal amount at different temperatures. For example, by plotting multiple cumulative chlorine removal amounts at an average water temperature of 14.5 degrees Celsius in Figure 4 and at an average water temperature of 22.8 degrees Celsius shown in Figure 5, a curve showing the relationship between cumulative chlorine removal amount and water temperature is obtained, as shown in Figure 6. Then, from this relationship between water temperature and cumulative chlorine removal amount, the temperature correction coefficient Kn for the average water temperature per unit cumulative flow rate is determined by graphing the cumulative chlorine removal amount at each water temperature as a ratio to the cumulative chlorine removal amount at a certain reference temperature (reference value), with the cumulative chlorine removal amount at the reference temperature being used as the reference value. For example, Figure 7 is a graph showing the relationship between water temperature and the temperature correction coefficient Kn, with the cumulative chlorine removal amount at a water temperature of 15 degrees Celsius being used as the baseline value. This temperature correction coefficient Kn is used to correct the chlorine removal amount per unit cumulative flow rate according to the average water temperature as the water passes through. For example, as shown in Figure 7, the higher the water temperature, the lower the temperature correction coefficient Kn, and the lower the water temperature, the larger the temperature correction coefficient Kn. Therefore, when calculating the chlorine removal amount per unit cumulative flow rate, multiplying by the temperature correction coefficient Kn corrects the amount of chlorine removal so that the amount of chlorine removal is greater at lower water temperatures and smaller at higher water temperatures.

[0062] Note that the numerical values ​​and graphs will change as appropriate depending on the values. For example, the temperature correction coefficient Kn may be calculated by including other parameters, such as the safety factor.

[0063] The raw water chlorine concentration is the chlorine concentration on the primary side of the filtration device, and is entered by the user, for example, via the input unit. The cumulative chlorine removal amount is calculated by summing the chlorine removal amounts corresponding to the cumulative flow rate per unit time, obtained by equation (1), for the time elapsed from the reference time. For example, if the reference time is when the activated carbon was replaced immediately before, the cumulative chlorine removal amount corresponding to the cumulative flow rate from that point in time can be determined. The value obtained by subtracting this cumulative chlorine removal amount from the chlorine removal standard amount is the residual chlorine removal amount, which represents the remaining chlorine removal performance of the activated carbon. The chlorine removal standard amount is the chlorine removal amount of the activated carbon at a certain reference time. The chlorine removal standard amount is, for example, the chlorine removal capacity when water is not flowing (when the water flow rate is 0) at the time of activated carbon replacement. For example, the chlorine removal standard amount is entered by the user, for example, via the input unit, according to the amount of activated carbon. Alternatively, the chlorine removal standard amount may be calculated by the processor 61 based on various information.

[0064] The processor 61 performs at least one of the following: communication processing, notification processing, or alert processing, depending on the amount of residual chlorine removed. For example, the processor 61 performs at least one of the following: communication processing, notification processing, or alert processing, when the amount of residual chlorine removed falls below the residual standard value, or when the cumulative amount of chlorine removed exceeds the removal standard value.

[0065] In this embodiment, when the residual chlorine removal amount of the activated carbon reaches a predetermined first reference value Y1 (0 < Y1 < chlorine removal reference amount), the processor 61 performs a notification process or an alarm process as insufficient residual chlorine removal amount. For example, the first reference value Y1 is set to 10% to 20% of the maximum chlorine removal amount. That is, when the residual chlorine removal amount of the activated carbon is less than 10% to 20% of the maximum chlorine removal amount, a notification process is set to notify that the timing of activated carbon replacement is approaching. As the notification process or the alarm process, for example, it is displayed on a display unit 65 that notifies of insufficient remaining amount, or lighting is turned on. In addition to or instead of the above notification or alarm process, when the residual chlorine removal amount of the activated carbon reaches a predetermined first reference value Y1 (0 < Y1 < reference removal amount), the processor 61 communicates via the communication unit 63. Specifically, communication is connected between the communication unit 63 and the communication terminal 100, and various operation data and external parameters are transmitted to the communication terminal 100. Note that a plurality of Y1s may be set step by step according to the content of the corresponding notification, alarm, or communication process.

[0066] Furthermore, when the residual chlorine removal amount of the activated carbon becomes equal to or less than a predetermined second reference value Y2, the processor 61 stops the supply of treated water to the secondary side of the activated carbon filtration device. For example, the second reference value Y2 is 0 or more and is a value smaller than the first reference value Y1. For example, the second reference value Y2 is set to less than 10% of the maximum chlorine removal amount. That is, the processor 61 is set to issue an alarm when the residual chlorine removal amount of the activated carbon becomes 10% or less of the maximum chlorine removal amount.

[0067] In addition, when the average water temperature in the unit integrated flow rate exceeds an arbitrary third reference value Y3 or an arbitrary flow rate range, the processor 61 displays an alarm to give a warning for attention because the chlorine removal ability significantly decreases when the water temperature becomes low. For example, the third reference value Y3 is set to the normal operation range (12°C to 30°C). That is, an alarm is issued when the average water temperature in the unit integrated flow rate deviates from this normal operation range value. For example, the lower limit (12°C) of the normal operation range is the temperature at which the integrated chlorine removal amount is half compared to the reference 15°C, and the upper limit (30°C) is set based on the upper limit value of the product specification, etc.

[0068] The processor 61 may also perform communication processing when the amount of residual chlorine removed by the activated carbon reaches a predetermined second reference value Y2, or when the unit cumulative flow rate or the average water temperature per unit time exceeds an arbitrary third reference value Y3 or an arbitrary water temperature range.

[0069] Memory 62 is capable of reading and writing data. Memory 62 stores data used by the processor 61, operating data of the water treatment device 1, and various data and programs used to control the water treatment device 1. Memory 62 includes non-volatile memory such as EEPROM (Electrically Erasable Programmable Read-Only Memory) (registered trademark), ROM (Read-only memory), or NAND flash memory. Memory 62 also includes an SSD (Solid State Drive) equipped with flash memory. In addition to non-volatile memory, memory 62 may include RAM having a work area where data that may be erased when the power is cut off is stored.

[0070] The data stored in memory 62 includes, for example, identification information, codes, and tables for identifying the control unit 26, as appropriate. Memory 62 also stores various programs, reference values, and thresholds as information necessary for control. The thresholds and set values ​​can be arbitrarily changed by the user through, for example, operation input. In addition, the memory 62 stores cumulative operation data, which is periodically acquired cumulative values ​​from the operation data indicating the operating status of the water treatment device 1, as operating data. Furthermore, the memory 62 stores parameters required for the control of each pump 11, 16, 50, 22, flow path switching units 34, 38, and various on-off valves S11-18.

[0071] The communication unit 63 is an arbitrary communication interface controlled by the processor 61 that can communicate with external devices such as the communication terminal 100 using wireless communication technology. The communication unit 63 may be implemented as, for example, a communication module or a communication board. The communication module may be detachably attached to the control board of the control unit 26 via a connector, for example. Specifically, the communication unit 63 can connect to external devices such as the communication terminal 100 using wireless communication technologies such as Bluetooth® (e.g., the Bluetooth Low Energy standard (hereinafter also referred to as the BLE standard)), Wi-Fi®, and general-purpose wireless communication technologies including LTE (Long Term Evolution)® and mobile phone lines, as well as long-range wireless communication technologies including dedicated wireless communication technologies such as Sigfox®.

[0072] For example, the communication unit 63 broadcasts an advertisement packet containing the identification information of the control unit 26. Alternatively, for example, if the communication unit 63 receives a connection request from the communication terminal 100 that receives the advertisement packet, it may establish communication with the communication terminal 100. The communication unit 63 is electrically connected to the processor 61 and is an example of a communication means capable of establishing communication with the communication terminal 100. Note that the broadcast communication of the advertisement packet may be performed by either the communication unit 63 of the control unit 26 or the external communication terminal 100, with the other receiving it.

[0073] For example, when the amount of residual chlorine removed by the processor 61 falls below a predetermined value Y1, the communication unit 63 communicates with an external communication terminal 100 as a notification process and outputs notification data, thereby informing the user of the shortage of recycled material through the communication terminal 100.

[0074] The input unit 64 includes at least one of the following: a device that accepts user input, such as an operation panel with buttons, a touch panel, a keyboard, or a mouse; and a sensor, such as a pressure sensor, a microphone, or a camera. The input unit 64 is a device that accepts user input, which is any command from the user, such as parameter settings or settings for each operating mode. The input unit 64 is configured so that various settings and instructions can be input by the user operating various buttons and switches. For example, the input unit 64 is configured to accept chlorine concentration information. The information input to the input unit 64 is stored in the memory 62 by the processor 61 or used for calculation processing.

[0075] The display unit 65 has a display device such as a liquid crystal display or an organic EL display. Alternatively, the display unit 65 may have a speaker, an LED (Light Emitting Diode) light-up unit, etc., instead of or in addition to the display device. The display unit 65 performs notification processing to inform the user of the low amount of recycled material by displaying a notification message on the display device, outputting sound from the speaker, or lighting up the light-up unit.

[0076] Interface 66 is a terminal or circuit to which various pump devices, sensors, on-off valves, external terminals, etc., can be electrically connected.

[0077] Next, an example of a communication terminal 100 that communicates data with such a water treatment device 1 will be described below. The communication terminal 100 is a management server, a programmable controller, a processing terminal that performs information processing or input processing, etc. Examples of communication terminals 100 include PCs, mobile terminals (e.g., tablets, smartphones, laptops, feature phones, mobile terminals), game consoles, etc., but are not limited to these, and may also be dedicated communication devices.

[0078] As illustrated in Figure 5, such a communication terminal 100 includes a communication unit 101, an input unit 102, a display unit 103, a memory 104, and a processor 105.

[0079] The communication unit 101 is controlled by the processor 105 and is an arbitrary communication interface capable of communicating with external devices such as the water treatment device 1, for example, using wireless communication technology. Specifically, the communication unit 101 can connect to the processor 61 of the water treatment device 1 using wireless communication technologies such as Bluetooth® (e.g., the Bluetooth Low Energy standard (hereinafter also referred to as the BLE standard)), Wi-Fi®, and long-range wireless communication technologies including general-purpose wireless communication technologies such as LTE (Long Term Evolution) and dedicated wireless communication technologies such as Sigfox. In addition to wireless communication, the communication unit 101 may also be configured to connect to other external devices using wired communication technologies such as USB. As a specific example, the communication unit 101 performs wireless communication with the processor 61 of the water treatment device 1 based on the BLE standard. The communication unit 101 may also include a normal communication interface for a mobile terminal that can communicate with a management server or other communication terminals via a base station and network, separate from the BLE standard communication described above. For example, the communication unit 101 is controlled by the processor 105 and transmits data such as functional parameters, internal parameters, and external parameters, as well as various programs for performing constant target pressure control, and change instructions for modifying this data and programs, to the communication unit 63 of the control unit 26.

[0080] The input unit 102 is an input interface for receiving user input and may be built into the communication terminal 100 or attached externally to the communication terminal 100. The input unit 102 may be, for example, a keyboard, mouse, numeric keypad, microphone, camera, etc., or it may have output interface functionality such as a touchscreen. Here, user input includes, for example, taps, clicks, drags, pressing of specific keys, and sounds captured by a microphone.

[0081] The display unit 103 is an example of an output interface for outputting images and / or sound in response to processing by the processor 105, and may include a display device for displaying moving images, still images, text, etc. The display unit 103 may also include a speaker for outputting sound, music, etc. "Display unit" may be read as "output unit". Examples of display devices include liquid crystal displays, organic EL (electroluminescence) displays, CRT (Cathode Ray Tube) displays, etc. The display device displays display data including content. The display device may also have input interface functionality, such as a touchscreen. The display unit 103 is an example of a display means.

[0082] Memory 104 stores programs executed by the processor 105 to perform various processes, as well as data used by the processor 105. Memory 104 may include RAM having a work area where such programs / data are loaded. Examples of programs stored include firmware, an operating system, and communication programs.

[0083] The processor 105 is typically a CPU, but may also be a microcontroller, FPGA, DSP, GPU (Graphics Processing Unit), or other general-purpose or dedicated processor. The processor 105 communicates wirelessly with the water treatment device 1 via the communication unit 101 and performs processing to manage the water treatment device 1. The processor 105 can function as a communication terminal 100 by executing a program stored in the memory 104. The functional division of each part within the processor 105 is for convenience only and can be changed as appropriate.

[0084] The processor 105 controls the communication unit 101 to perform wireless communication with the water treatment device 1. For example, the processor 105 sends a connection request to the control unit 26 that sent the advertised packet. The processor 105 may also send some data via the communication unit 101 to establish a connection with the water treatment device 1, or send a request to the water treatment device 1 in response to the operator's actions. Alternatively, the processor 105 may receive some data to establish a connection between the communication terminal 100 and the water treatment device 1, for example, a request from the water treatment device 1 acting as an advertiser if the water treatment device 1 and the communication terminal 100 are connected via Bluetooth as a scanner and advertiser, respectively.

[0085] When the processor 105 establishes communication between the communication terminal 100 and the communication unit 63 via the communication unit 101, it receives various operating data and various parameters from the processor 61.

[0086] The processor 105 performs information processing according to the worker's tasks, such as inspection, maintenance, management, parameter viewing and modification, and program updates of the water treatment device 1.

[0087] For example, when the communication unit 101 receives various operating data and external parameters, the processor 105 displays a portion of the received content on the display unit 103 and changes the portion displayed in accordance with the operator's scrolling operation.

[0088] The various operations performed by the water treatment apparatus 1 according to this embodiment will be described below with reference to Figure 1. In Figure 1, solid arrows indicate filtration, and dashed arrows indicate backwashing.

[0089] The filtration process is a function that performs normal operation by driving the chemical injection device 12A to inject chemicals into the raw water and filtering it in the filtration tank 31 to remove impurities consisting of iron, manganese, and solids from the raw water. The filtration process is a function that performs normal operation by driving the filtration devices 13 and 14 to inject chemicals into the raw water and filtering it in the filtration tank 31 to remove impurities consisting of iron, manganese, and solids from the raw water, as well as removing chlorine in the filtration tank 35.

[0090] The filtration process includes a chemical injection process on the primary side of the first filtration device in which chlorine is injected into the raw water; a first filtration process in which water is passed through the first filtration device to remove iron or manganese contained in the water; a second filtration process on the secondary side of the first filtration device in which chlorine is removed from the first treated water after filtration; and a second chemical injection process on the secondary side of the second filtration device in which chlorine is injected into the second treated water that has been filtered.

[0091] In the filtration process, the processor 61 switches the three-way valves 41, 42, 43, 44, 45, 46 and the on / off valves S of the water passages so that the flow path from the primary side to the secondary side of the filtration devices 13 and 14 flows in the following order: treated water passages 17a, 17b, suction pipe 32, filtration tank 31, recovery pipe 33, treated water passages 17c, 17d, suction pipe 36, filtration tank 35, recovery pipe 37, and treated water passages 17e, 17f.

[0092] In other words, the processor 61 opens ports P1, P2, P5, P6, P7, and P8 in the first filtration device 13 and closes the others to set up the flow path for filtration. The processor 61 also opens ports P11 to P19 in the second filtration device 14 and closes the others to set up the flow path for filtration.

[0093] In this state, the processor 61 drives the raw water pump 11 at a predetermined timing. For example, based on the liquid level information detected by, for example, a liquid level sensor, when the processor 61 detects that the liquid level in the treatment water tank 15 has dropped to a predetermined pump startup reference value, the processor 61 drives the raw water pump 11. By driving the raw water pump 11, the raw water is lifted and filtered through the chemical liquid injection devices 12A and 12B, the first filtration tank 31, and the second filtration tank 35. That is, impurities such as iron, manganese, and solids are removed in the first filtration device 13 to obtain the first treated water L1 (treated water), and chlorine is further removed by passing through the filtration tank 35 of the second filtration device 14.

[0094] The detection process and notification process during the filtration process in this embodiment will be described according to the flowchart of FIG. 3. As ST1, the processor 61 detects the flow rate and water temperature at a predetermined timing during the filtration process. That is, the detection results of the flow rate sensor 23 and the water temperature sensor 24 are acquired. Then, as ST2, the processor 61 obtains the chlorine removal amount per unit integrated flow rate according to Equation (2) based on the chlorine removal reference amount input in advance, the flow rate, and the water temperature. Further, as ST3, the processor 61 obtains the integrated chlorine removal amount according to Equation (3). Further, the processor 61 calculates, as the remaining chlorine removal amount, the value obtained by subtracting the integrated chlorine removal amount from the chlorine removal reference amount of the activated carbon filtration device. In the above ST1, ST2, and ST3, the processor 61 stores various data such as the detected flow rate, water temperature, calculated unit integrated flow rate, chlorine removal amount per unit integrated flow rate, and remaining chlorine removal amount in the memory 62. The information on the chlorine removal reference amount of the activated carbon filtration device is input and stored, for example, when the user operates the input unit.

[0095] As ST4, the processor 61 determines whether the remaining chlorine removal amount of the activated carbon is less than or equal to a predetermined value Y1 (0 < Y1 < reference removal amount). Further, as ST5, the processor 61 determines whether the remaining chlorine removal amount of the activated carbon is less than or equal to a predetermined Y2.

[0096] In ST4, if the amount of residual chlorine removed is less than or equal to Y1 (Yes in ST4, No in ST4), notification processing is performed as insufficient residual chlorine removal (ST6, ST7). For example, notification processing may include displaying a message indicating insufficient remaining amount, turning on the lights, or outputting an external signal from the communication unit 63. For example, the user may replenish the recycled material after receiving various notification processing to recognize the need for replenishment.

[0097] Furthermore, if the amount of residual chlorine removed in ST5 is less than or equal to Y2 (Yes in ST5), the processor 61 stops supplying treated water to the secondary side of the activated carbon filter (ST8). Specifically, as a process to stop the supply of treated water, the processor 61 stops the raw water pump 11 and the feedwater pump 50.

[0098] Furthermore, during the filtration process, if the average water temperature in the unit cumulative flow rate exceeds an arbitrary value Y3 or a predetermined range (ST9), the processor 61 performs a second notification or alert process (ST10). The processor 61 performs processes such as displaying a message indicating that the average flow rate is excessive, turning on the lights, or outputting an external signal from the communication unit 63. For example, Y3 indicates a flow rate value at which filtration is not sufficiently performed at that water temperature, and is set to, for example, an arbitrary value. For example, the user can detect that chlorine removal is not sufficient by receiving these notifications, alerts, or communication processes and recognizing that the average water temperature is excessive. Note that in ST9, the notification, alert, or communication process may be performed when the water temperature value detected at a predetermined timing exceeds the predetermined value Y3 or a predetermined range, rather than the average water temperature.

[0099] The backwashing process involves flowing backwash water from the recovery pipe 33, passing it through the filter material in the filter tanks 31 and 35 from bottom to top, and then draining it. This process backwashes the filter material and agitates the filter material inside the filter tank 35, thereby maintaining its removal capacity.

[0100] Specifically, the three-way valves 41, 42, 43, 44, 45, 46 and the on / off valves S of the water passages are switched so that the flow paths of the filtration devices 13 and 14 flow in the order of backwash channel 18, recovery pipes 33, 37, filtration tanks 31, 35, suction pipes 32, 36, and backwash drain channels 19a, 20a.

[0101] In other words, in the first filtration device 13, the processor 61 opens ports P4, P5, P2, P3 and valves S4, S5, S15, S16, and closes the others to set up a flow path for backwashing. Also, in the second filtration device 14, the processor 61 opens the flow paths of ports P14, P15, P12, P13 and valves S9, S10, S15, S16, and closes the others to set up a flow path for backwashing.

[0102] In this state, the processor 61 drives the backwash pump 16 at a predetermined timing to send backwash water L3 to the flow path switching units 34 and 38 respectively. The water then flows from the recovery pipes 33 and 37 through the filter material to the suction pipes 32 and 36, and is drained from the backwash drainage channels 19a and 20a. This backwashing process washes the filter material by flowing raw water from the bottom to the top of the filter tanks 31 and 35, and discharges oxides and fine particles accumulated in the filter tanks 31 and 35.

[0103] The cleaning process involves discarding the backwash water remaining inside the filtration tanks 31 and 35 as wastewater during the backwashing process, thereby cleaning the filtration tanks. After the cleaning process, the treated water from filtration tank 31 passes through the same flow path as the filtration process, but does not flow into the first treatment channel 17d and is instead drained into the test drainage channel 19c. The treated water from filtration tank 35 does not flow into the second treatment channel 17f but is instead drained into the test drainage channel 20c.

[0104] In the washing process, the processor 61 sets the flow path of the first filtration device 13 from the primary side to the secondary side so that the water flows in the following order: treatment channels 17a, 17b, suction pipe 32, filtration tank 31, recovery pipe 33, treatment channel 17c, and washing drain channel 19b. The processor 61 also sets the flow path of the second filtration device 14 from the primary side to the secondary side so that the water flows in the following order: treatment channels 17a, 17b, suction pipe 32, filtration tank 31, recovery pipe 33, treatment channels 17c, 17d, suction pipe 36, filtration tank 35, recovery pipe 37, treatment channel 17e, and washing drain channel 20b.

[0105] Test wastewater treatment is a process in which a portion of the treated water is sampled, for example, to check the water quality. As part of the test wastewater treatment, the processor 61 can open the on-off valves S7 and S12 on the test drain channels 19c and 20c from the open / closed state of the filtration process, recirculate the treated water from the test drain channels 19c and 20c, and guide the treated water for maintenance to the test drains D3 and D13. At this time, the on-off valves S8 and S14 on the treated water channels 17d and 17e may be closed or open. For example, if an abnormality is found in the water quality, the on-off valves S8 and S14 are closed to prevent water from flowing into the treated water tank 15, and the treated water is drained from D3 and D13 to perform maintenance.

[0106] The water treatment apparatus 1 and water treatment method according to this embodiment provide the following effects. Specifically, the water treatment apparatus 1 detects the flow rate passing through the filtration tank and calculates the amount of chlorine removed by the filter material by making a correction according to the water temperature as it passes through, thereby enabling the determination of the cumulative chlorine removal amount according to the usage conditions. In other words, the residual chlorine removal amount can be determined based on the cumulative flow rate, taking into account the difference in chlorine removal amount due to differences in water temperature. Furthermore, the water treatment apparatus 1 and water treatment method enable the determination of the appropriate time to replace the activated carbon according to the usage environment by subtracting the cumulative chlorine removal amount from the chlorine removal standard amount of the filtration device, which is stored or input in advance, as the residual chlorine removal amount.

[0107] Also, according to the water treatment apparatus 1 and the water treatment method, when the residual chlorine removal amount of the activated carbon becomes not more than a predetermined value Y1 (0 < Y1 < reference removal amount), by performing a notification process as insufficient residual chlorine removal amount, it is possible to prompt the user for an appropriate replacement timing of the activated carbon according to the usage environment. Further, when the residual chlorine removal amount of the activated carbon becomes not more than a value Y2 which is even lower than the predetermined Y1, by stopping the supply of the treated water to the secondary side of the activated carbon filtration device, it is possible to avoid the risk of chlorine flowing out to the secondary side of the device beyond the limit of the activated carbon. Therefore, it is possible to provide safe treated water. On the other hand, since there is no need to replace the activated carbon with an excessive remaining capacity of the removal ability, it is possible to reduce the costs of the activated carbon and the replacement work cost.

[0108] Furthermore, according to the water treatment apparatus 1 and the water treatment method, by issuing an alarm when the average water temperature deviates from the range of a predetermined normal operation, for example, it is possible to detect a case where the water temperature is too low and sufficient filtration cannot be performed.

[0109] The present invention is not limited to the above-described embodiments as they are, and the specific configurations and processes of each part can be changed as appropriate.

[0110] For example, in the above-described embodiment, an example is shown in which the processor 61 provided in the water treatment apparatus 1 including the second filtration device 14 calculates and detects various data such as the detected flow rate, water temperature, calculated unit integrated flow rate, chlorine removal amount per unit integrated flow rate, and residual chlorine removal amount. However, the present invention is not limited thereto. For example, as another embodiment, various detections and calculations may be performed in a communication terminal or a management terminal as a processing device which is a device separate from the water treatment apparatus 1. That is, for example, a processor 61 may be provided in a communication terminal or a management terminal as a processing device, and in the terminal, various data such as the unit integrated flow rate, chlorine removal amount per unit integrated flow rate, and residual chlorine removal amount may be calculated and detected from the flow rate and water temperature detected by each sensor, and communication processing, notification processing, or alarm processing may be performed.

[0111] Furthermore, the water treatment device 1 described above merely represents an example of its configuration, wireless communication technology, wireless communication method, data and program content, and operation processing, and of course, these can be changed as appropriate. For example, in the above embodiment, an example was shown in which the user sets the chlorine removal standard amount and subtracts the total value of the calculated cumulative chlorine removal amount, but this is not the only example. For example, it is also possible to subtract the amount of chlorine removed per unit time calculated at regular intervals from a pre-set or inputted chlorine removal standard amount, update the chlorine removal standard amount by subtracting it, and store the result. In this case, the amount of residual chlorine removed can be determined by subtracting the amount of chlorine removal accumulated per unit time from the updated chlorine removal standard amount.

[0112] Furthermore, it is possible to store data such as the cumulative chlorine removal amount and residual chlorine removal amount calculated at each point in time in a memory table, and the processor can detect the residual chlorine removal amount by referring to this memory table when detection occurs.

[0113] In another embodiment, the amount of chlorine removed may be calculated by further considering corrections based on the filtration flow rate in addition to the correction based on water temperature. For example, the processor may determine the SV value and correct it so that the amount of chlorine removed increases as the SV value is higher, and decreases as the SV value is lower.

[0114] For example, the control unit calculates the amount of chlorine removed based on the flow rate of the fluid passing through the activated carbon filter, the chlorine concentration, and the integrated flow rate calculated based on that flow rate. Specifically, the control unit uses Mn as the amount of chlorine removed per unit integrated flow rate, V as the unit integrated flow rate, C as the raw water chlorine concentration, Kn as the temperature correction coefficient, and Kn2 as the flow rate correction coefficient. M n The amount of chlorine removed per unit integrated flow rate is calculated using the formula: = V × C × Kn × Kn².

[0115] Here, Kn2 is a flow correction coefficient obtained using flow information input from, for example, a flow sensor, and is determined from the relationship between multiple plotted SV values ​​and the amount of chlorine removed per liter of activated carbon. For example, the processor uses the flow information input from the flow sensor to calculate the average flow rate Q per unit integrated flow rate. Then, the SV value is determined from *SV (space velocity) = Q (flow rate m3 / hr) / Vf (filter volume m3) ... (Equation 3). Then, the correction coefficient Kn2 is obtained by graphing the amount of chlorine removed for each SV value as a ratio to the amount of chlorine removed per liter of activated carbon (reference value) for the reference SV value. For example, the flow correction coefficient Kn2 is larger as the SV value increases and smaller as the SV value decreases.

[0116] It should be noted that the present invention is not limited to the embodiments described above, and can be modified in various ways during implementation without departing from its essence. Furthermore, each embodiment may be combined as appropriate, and in that case, the combined effects can be obtained. Moreover, the above embodiments include various inventions, and various inventions can be extracted by selecting combinations from the multiple constituent elements disclosed. For example, if the problem can be solved and effects obtained even if some constituent elements are deleted from all the constituent elements shown in the embodiment, then the configuration with these deleted constituent elements can be extracted as an invention. The following is an appended description equivalent to the invention described in the claims of the original application. [1] An activated carbon filtration system comprising a filtration tank containing a filter material including activated carbon, A water treatment apparatus comprising a control unit that calculates the amount of chlorine removed based on the temperature of the fluid passing through the activated carbon filter, the chlorine concentration, and the cumulative flow rate. [2] The control unit is configured such that Mn is the amount of chlorine removed per unit integrated flow rate, V is the unit integrated flow rate, C is the raw water chlorine concentration, and Kn is the temperature correction coefficient. The water treatment apparatus according to [1], wherein the amount of chlorine removed per unit integrated flow rate is calculated using the formula Mn = V × C × Kn. [3] The control unit calculates the amount of residual chlorine to be removed based on the flow rate, the temperature, the cumulative flow rate, the chlorine concentration, and the chlorine removal standard amount. The temperature correction coefficient Kn is calculated based on the relationship between water temperature and unit integrated flow rate obtained from data on the average water temperature per unit integrated flow rate, and is a value that is smaller as the water temperature is higher and larger as the water temperature is lower, as described in [2]. [4] A first filtration device is provided on the primary side of the activated carbon filtration device and removes iron or manganese contained in the water by passing water through it. On the primary side of the first filtration device, a chemical injection device is provided for injecting chlorine into the raw water supplied to the first filtration device, On the secondary side of the activated carbon filter, a second chemical injection device is provided for injecting chlorine into the second treated water after filtration, An input unit into which the chlorine concentration and the chlorine removal standard amount can be input, A flow rate detection unit for detecting the flow rate of fluid passing through the activated carbon filter, The water treatment apparatus according to [3], further comprising a temperature detection unit for detecting the temperature of the fluid passing through the activated carbon filter. [5] The control unit determines the total amount of chlorine removed per unit integrated flow rate = M 1 + M 2 + M 3 The water treatment apparatus according to [3], wherein the cumulative chlorine removal amount is defined as + … + Mn (3), and the residual chlorine removal amount is defined as the value obtained by subtracting the cumulative chlorine removal amount calculated from the flow rate and the chlorine concentration from the chlorine removal standard amount. [6] The water treatment apparatus according to [5], wherein the control unit sends at least one of the detected or calculated information of the fluid temperature, flow rate, unit integrated flow rate, amount of chlorine removed per unit integrated flow rate, the integrated amount of chlorine removed, and the amount of residual chlorine removed to an external terminal. [7] The control unit performs notification processing, alert processing, or communication processing when the amount of residual chlorine removed falls below the residual standard value, or when the cumulative amount of chlorine removed exceeds the removal standard value, as described in [4]. [8] The water treatment apparatus according to [4], wherein the control unit stops supplying treated water to the secondary side of the activated carbon filter when the amount of residual chlorine removed is less than or equal to the second reference value. [9] The water treatment apparatus according to [1], which performs notification processing, alert processing, or communication processing, or stops the supply of treated water to the secondary side of the activated carbon filter, when the average water temperature in the unit cumulative flow rate falls outside a predetermined range.

[10] The water treatment apparatus according to [1], comprising a flow path switching means for switching between multiple processes, including filtration and backwashing, by switching the connection state of multiple flow paths connected to the activated carbon filter.

[11] A processing apparatus comprising a control unit that calculates the amount of chlorine removed per unit integrated flow rate based on the temperature of the fluid passing through an activated carbon filtration apparatus equipped with a filtration tank containing a filter material containing activated carbon, the chlorine concentration, the flow rate, and the integrated flow rate calculated based on the said flow rate.

[12] The control unit is configured such that Mn is the amount of chlorine removed per unit integrated flow rate, V is the unit integrated flow rate, C is the raw water chlorine concentration, Kn is the temperature correction coefficient, and Kn2 is the flow rate correction coefficient. The amount of chlorine removed per unit integrated flow rate is calculated using the formula Mn = V × C × Kn × Kn², The temperature correction coefficient Kn is calculated based on the relationship between water temperature and unit integrated flow rate, obtained from data on the average water temperature per unit integrated flow rate. It is a value that decreases as the water temperature increases and increases as the water temperature decreases. The flow rate correction coefficient Kn2 is calculated based on the relationship between the SV value, which is derived from the flow rate information input from the flow sensor, and the amount of chlorine removed. The value is larger when the SV value is high and smaller when the SV value is low, according to the processing apparatus described in

[11] .

[13] A first filtration process removes iron or manganese contained in the water by passing it through a first filtration device, On the primary side of the first filtration device, a chemical injection process is performed in which chlorine is injected into the raw water supplied to the first filtration device, On the secondary side of the first filtration device, a second filtration process is performed in which the water is passed through a filtration tank containing activated carbon to remove chlorine from the first treated water after filtration, A water treatment method comprising: a process for detecting the amount of chlorine removed based on the temperature of the fluid passing through the filtration tank containing the activated carbon, the chlorine concentration, and the cumulative flow rate. [Explanation of Symbols]

[0117] 1...Water treatment device, 10...Supply source, 11...Raw water pump, 12A, 12B...Chemical injection device, 13...First filtration device, 14...Second filtration device, 15...Treatment tank, 16...Backwash pump, 17...Treatment channel, 17a...Raw water channel, 17b...Supply channel, 17c...Flow channel, 17d...First treatment channel, 17e...Flow channel, 17f...Second treatment channel, 18...Backwash channel, 19a...Backwash drainage channel, 19b...Washing drainage channel, 19c...Test drainage channel, 20a...Backwash drainage channel, 20b...Washing drainage channel, 20c...Test drainage channel, 21...Chemical tank, 22...Injection pump, 23...Flow sensor, 24...Water temperature sensor, 26...Control unit, 31...Filtration tank, 32...Suction pipe, 33...Time 34... Flow path switching unit, 35... Filtration tank, 36... Suction pipe, 37... Recovery pipe, 38... Flow path switching unit, 41-46... Three-way valve, 50... Water supply pump, 61... Processor, 62... Memory, 63... Communication unit, 64... Input unit, 65... Display unit, 66... ​​Interface, 100... Communication terminal, 101... Communication unit, 102... Input unit, 103... Display unit, 104... Memory, 105... Processor, D1, D11... Backwash drain, D2, D12... Washing drain, D3, D13... Test drain, Kn2... Correction coefficient, L1... Treated water, L3... Backwash water, P1-P9, P11-19... Port, S1... Check valve, S2-S17... On / off valve.

Claims

1. An activated carbon filtration system comprising a filtration tank containing a filter material including activated carbon, The system includes a control unit that calculates the amount of chlorine removed based on the temperature of the fluid passing through the activated carbon filter, the chlorine concentration, and the cumulative flow rate. The control unit, Let Mn be the amount of chlorine removed per unit integrated flow rate, V be the unit integrated flow rate, C be the raw water chlorine concentration, and Kn be the temperature correction coefficient. Then, the amount of chlorine removed per unit integrated flow rate is calculated using the formula Mn = V × C × Kn. The total amount of chlorine removed per unit cumulative flow rate is calculated as M1 + M2 + M3 + ... + Mn, and The amount of residual chlorine removed is calculated by subtracting the cumulative amount of chlorine removed from the standard amount of chlorine removal. If the amount of residual chlorine removed falls below the first standard value, which is the residual standard value, or if the cumulative amount of chlorine removed exceeds the removal standard value, notification processing, alert processing, or communication processing is performed. A water treatment device that stops supplying treated water to the secondary side of the activated carbon filter when the amount of residual chlorine removed is less than or equal to the second standard value, based on a second standard value that is lower than the first standard value.

2. The water treatment apparatus according to claim 1, wherein the temperature correction coefficient Kn is calculated based on the relationship between water temperature and unit integrated flow rate obtained from data on the average water temperature per unit integrated flow rate, and is a value that becomes smaller as the water temperature is higher and larger as the water temperature is lower.

3. A first filtration device is provided on the primary side of the activated carbon filtration device and removes iron or manganese contained in the water by passing water through it. On the primary side of the first filtration device, a chemical injection device for injecting chlorine into the raw water supplied to the first filtration device, On the secondary side of the activated carbon filtration apparatus, a second chemical injection device is provided for injecting chlorine into the second treated water after filtration, An input unit into which the chlorine concentration and the chlorine removal standard amount can be input, A flow rate detection unit for detecting the flow rate of fluid passing through the activated carbon filter, The water treatment apparatus according to claim 2, further comprising a temperature detection unit for detecting the temperature of the fluid passing through the activated carbon filter.

4. The water treatment apparatus according to claim 1, wherein the control unit sends at least one of the detected or calculated information of the fluid temperature, flow rate, unit integrated flow rate, amount of chlorine removed per unit integrated flow rate, the total amount of chlorine removed, and the amount of residual chlorine removed to an external terminal.

5. The water treatment apparatus according to claim 1, wherein when the water temperature drops and the average water temperature in the unit cumulative flow rate falls outside a predetermined range, notification processing, alert processing, or communication processing is performed, or the supply of treated water to the secondary side of the activated carbon filter is stopped.

6. The water treatment apparatus according to claim 1, further comprising a flow path switching means for switching between multiple processes, including filtration and backwashing, by switching the connection state of multiple flow paths connected to the activated carbon filter.

Images