Operational method of water treatment system and water treatment system

Abstract

To provide a quick presentation of a more accurate replacement time for a filler without affecting actual operation.SOLUTION: A system has: a plurality of packed towers 10-1 to 10-4 which are installed in parallel with each other and are filled with a filler; a pump 410 which supplies treated water to the plurality of packed towers 10-1 to 10-4 from one supply source; an evaluation packed tower 20 in which at least a part of the filler filled in a first packed tower is filled after the treated water is supplied to the first packed tower among the plurality of packed towers 10-1 to 10-4 for a pre-determined usage period, and the treated water is supplied; and a calculation part 30 which calculates a recommended replacement period of the filler based on the water quality of the treated water treated by the evaluation packed tower 20.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an operation method of a water treatment system and a water treatment system.

Background Art

[0002] In a water treatment system in which water to be treated is passed through a packed tower filled with a packing such as activated carbon or resin to remove impurities from the water to be treated, it is necessary to periodically replace the used packing. Needless to say, the closer the replacement time is to the life of the packing, the more efficiently the packing can be used. Therefore, a technique for predicting the life of a water treatment device based on the deterioration situation of the quality of the treated water treated by a part of the water treatment devices among the water treatment devices installed in parallel, with the water passing load to the part of the water treatment devices being higher than the water passing load to the other water treatment devices, has been considered (for example, see Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Generally, from the viewpoint of the need to stably supply pure water or ultrapure water from a water treatment system, it is preferable that the operating conditions of the water treatment facilities constituting each series are the same. For example, as described in Patent Document 1, operating such that only the load applied to one series is different from the load applied to the other series may make it difficult to ensure the stability of water quality and device management.

[0005] An object of the present invention is to provide an operation method of a water treatment system and a water treatment system that can quickly present a more accurate replacement time of a packing without affecting actual operation.

Means for Solving the Problems

[0006] The operation method of the water treatment system of the present invention is as follows: A plurality of packed parts installed in parallel with each other and filled with packing materials are supplied with water to be treated from one supply source. After supplying the water to be treated to the first packed part among the plurality of packed parts for a predetermined service life, at least a part of the packing material filled in the first packed part is filled into an evaluation packed part outside the plurality of packed parts, and the water to be treated is supplied to the evaluation packed part filled with the packing material. Measure the water quality of the treated water treated in the evaluation packed part. Based on the value indicating the measured water quality, calculate the recommended replacement period of the packing material.

[0007] Further, the water treatment system of the present invention includes: A plurality of packed parts installed in parallel with each other and filled with packing materials; A supply part that supplies water to be treated from one supply source to the plurality of packed parts; After supplying the water to be treated to the first packed part among the plurality of packed parts for a predetermined service life, at least a part of the packing material filled in the first packed part is filled into an evaluation packed part where the water to be treated is supplied, and the evaluation packed part is provided; After the water to be treated is supplied to the evaluation packed part, calculate the arrival period until the value indicating the water quality of the treated water treated in the evaluation packed part reaches a predetermined threshold value, and based on the service life and the arrival period, calculate a calculation unit for calculating the recommended replacement period of the packing material.

Advantages of the Invention

[0008] In the present invention, it is possible to quickly present a more accurate replacement time of the packing material without affecting the actual operation.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0010] Hereinafter, embodiments of the present invention will be described with reference to the drawings. (First Embodiment)

[0011] FIG. 1 is a diagram showing a first embodiment of the water treatment system of the present invention. As shown in FIG. 1, the water treatment system in this embodiment includes a plurality of packed towers 10-1 to 10-4, an evaluation packed tower 20, measuring devices 300 and 310, and a calculation unit 30. Also, water tanks 100 and 110 are provided. The pump 400 pumps up the water to be treated, which is raw water stored in the water tank 100, and supplies it to the sand filtration device 200. The water to be treated supplied to the sand filtration device 200 has impurities such as suspended matter and turbidity removed by the sand filtration device 200 and is stored in the water tank 110. The pump 410, which is a supply unit, pumps up the water to be treated stored in the water tank 110 and supplies it to each of the plurality of packed towers 10-1 to 10-4 arranged in parallel with each other. At this time, the water to be treated pumped up by the pump 410 is supplied to each of the plurality of packed towers 10-1 to 10-4 via the branch lines 11 connected to each of the plurality of packed towers 10-1 to 10-4. Each of the treated waters that has passed through and been treated by the plurality of packed towers 10-1 to 10-4 merges in the merge line 12 and is supplied to the water treatment device at the supply destination. The water flow rates of the water to be treated passed through each of the plurality of packed towers 10-1 to 10-4 are the same as each other. Examples of the water treatment device at the supply destination include an ion exchange device and a reverse osmosis membrane device. Also, by adjusting the valve 500, which is an on-off valve capable of controlling the opening degree, a part of the water to be treated pumped up by the pump 410 has its supply amount adjusted and is supplied to the evaluation packed tower 20. Note that in FIG. 1, the case where there are four packed towers 10-1 to 10-4 is shown as an example, but the number may be plural as long as it is more than one.

[0012] Each of the plurality of filling towers 10-1 to 10-4 that is a filling part is filled with a filler. Examples of the filler filled in each of the filling towers 10-1 to 10-4 include activated carbon and ion resin. In the following description, the case where the filler filled in each of the filling towers 10-1 to 10-4 is activated carbon will be taken as an example for explanation. The filling towers 10-1 to 10-4 are filled with activated carbon of the same brand and capacity. The activated carbon filled in the filling towers 10-1 to 10-4 and through which the water to be treated is passed is exchanged with unused activated carbon at a predetermined timing. In this embodiment, this predetermined timing is the timing when a predetermined period (service period) has elapsed since the unused activated carbon was filled in the filling towers 10-1 to 10-4 and the water flow was started. For example, the predetermined timing may be set to 2 years in advance. Also, the timing of exchanging the activated carbon in at least two of the filling towers 10-1 to 10-4 is different from each other. This is to avoid the entire filling towers 10-1 to 10-4 from stopping operation due to the overlapping of the timing of exchanging the activated carbon in the filling towers 10-1 to 10-4 arranged in parallel.

[0013] The measuring instrument 300 measures the water quality of the water to be treated pumped up from the water tank 110 using the pump 410. Examples of the measuring instrument 300 include a conductivity meter, a TOC (Total Organic Carbon) meter, a residual chlorine concentration meter, a turbidity meter, a pH meter, etc.

[0014] The measuring instrument 310 measures the water quality of the treated water (the outlet water of the evaluation filling tower 20) passed through and treated in the evaluation filling tower 20. Examples of the measuring instrument 310 include a conductivity meter, a TOC meter, a residual chlorine concentration meter, a turbidity meter, a pH meter, etc. The measuring instrument 310 notifies the calculated measurement value to the calculation unit 30.

[0015] In the evaluation filling tower 20, which is an evaluation filling section, activated carbon (packing material) after the treated water has passed through and been exchanged is filled. The activated carbon filled in the evaluation filling tower 20 is at least a part of the activated carbon that has been filled and used in the filling towers 10-1 to 10-4. For example, when the activated carbon filled in the filling tower 10-1 and through which the treated water has passed is replaced with unused activated carbon, a part of the used activated carbon that has been replaced is filled in the evaluation filling tower 20.

[0016] The opening degree of the valve 500 is controlled so that the water flow load of the treated water to the activated carbon filled in each of the filling towers 10-1 to 10-4 and the water flow load of the treated water to the activated carbon filled in the evaluation filling tower 20 are equal to each other. Specifically, based on the water flow rate per unit time of the treated water passed through each of the filling towers 10-1 to 10-4 and the capacity of the activated carbon filled in each of the filling towers 10-1 to 10-4, the superficial velocity SV per unit time and per unit activated carbon is calculated. The opening degree of the valve 500 is controlled so that the treated water with a water flow rate such that the calculated superficial velocity SV and the superficial velocity SV to the evaluation filling tower 20 are equal is supplied to the evaluation filling tower 20. For example, if the capacity of the activated carbon filled in each of the filling towers 10-1 to 10-4 is 2 m 3 and the water flow rate per unit time of the treated water to each of the filling towers 10-1 to 10-4 is 10 m 3 / h, the superficial velocity SV is 10 m 3 / h÷2 m 3 =5 It becomes like this. When the capacity of the activated carbon filled in the evaluation packed tower 20 is 200 mL, in order to set the superficial velocity SV of the evaluation packed tower 20 to 5, it is necessary to pass the treated water with a flow rate 5 times the flow rate of the treated water per unit time to each of the packed towers 10-1 to 10-4. Therefore, the opening degree of the valve 500 is controlled so that 1000 mL / h of the treated water is supplied to the evaluation packed tower 20. These calculations may be performed by the calculation unit 30. Although there is no particular limitation on the capacity of the activated carbon filled in the evaluation packed tower 20, it is preferable to determine the capacity of the activated carbon filled in the evaluation packed tower 20 in consideration of making the superficial velocity SV and the linear velocity LV of the evaluation packed tower 20 equal to the superficial velocity SV and the linear velocity LV of each of the packed towers 10-1 to 10-4, respectively.

[0017] Furthermore, it is preferable to control the opening degree of the valve 500 so that the linear velocity LV of the evaluation packed tower 20 is equal to the linear velocity LV of the packed towers 10-1 to 10-4. The linear velocity LV (m / h) is calculated by the following formula. LV = water flow rate (m 3 / h) ÷ flow path cross-sectional area (m 2 ) By controlling the opening degree of the valve 500 so that the linear velocity LV of the evaluation packed tower 20 is equal to the linear velocity LV of the packed towers 10-1 to 10-4, the water flow state of the packed towers 10-1 to 10-4 can be reproduced more accurately using the evaluation packed tower 20.

[0018] The calculation unit 30 calculates the arrival period from when the evaluation packed tower 20 is filled with activated carbon and the treated water is supplied until the water quality measured by the measuring instrument 310 reaches a predetermined threshold value. As described above, the measuring instrument 310 measures, as the water quality of the treated water passed through and treated in the evaluation packed tower 20, for example, conductivity, TOC, residual chlorine concentration, turbidity, pH, etc. The calculation unit 30 uses a threshold value corresponding to the measured value. The calculation unit 30 calculates the recommended replacement period of the activated carbon based on the above-described usage period and the calculated arrival period. For example, when the usage period is two years and the arrival period is six months (half a year), the calculation unit 30 calculates two years and six months (two and a half years) from when water is started to be passed through the unused activated carbon as the recommended replacement period of the activated carbon. The recommended replacement period calculated by the calculation unit 30 may be displayed on a display unit such as a display, may be printed and output, or may be output as sound. Note that the calculation unit 30 may calculate, as the recommended replacement period, the timing when the value of the water quality measured by the measuring instrument 310 reaches a predetermined threshold value after the evaluation packed tower 20 is filled with activated carbon and the treated water is supplied (for example, the timing when the TOC value measured by the measuring instrument 310 becomes twice the TOC value of the water quality at the start of water passage after the treated water is supplied). Further, when the number of times the TOC value of the treated water in the evaluation packed tower 20 measured within a predetermined period exceeds a predetermined range is equal to or more than a predetermined number of times, the calculation unit 30 may calculate the period from the start of water passage to the evaluation packed tower 20 until then as the recommended replacement period.

[0019] When using activated carbon, if the TOC removal performance of the activated carbon deteriorates, the unremoved TOC will flow into the subsequent equipment. As a result, there is a risk of water quality deterioration and performance degradation of the subsequent equipment due to TOC contamination. In addition, if the residual chlorine contained in the water to be treated leaks, the resin or RO arranged downstream of the equipment filled with the activated carbon may deteriorate. Therefore, it is also preferable to conduct residual chlorine management. Furthermore, when the activated carbon deteriorates in the hypochlorite state, fine powder is generated from the activated carbon, and the generated fine powder flows into the equipment arranged downstream of the equipment filled with the activated carbon. Then, it will cause water quality deterioration due to the mixing of fine powder into the resin tower arranged downstream and clogging of the filter. For these reasons, conductivity, TOC, residual chlorine concentration, turbidity, pH, etc. are used as the water quality measured by the measuring instrument 310 and the corresponding threshold values. Also, these values may be used in combination to set the water quality and threshold values. For example, a value obtained by multiplying the value of TOC by the value of residual chlorine concentration may be used.

[0020] Figure 2 is a graph showing an example of the temporal change in the water quality measured by the measuring instrument 310 after the water to be treated is supplied to the evaluation packed tower 20 shown in Figure 1. The vertical axis shown in Figure 2 indicates that the higher the value, the worse the water quality. As shown in Figure 2, the water quality measured by the measuring instrument 310 after the water to be treated is supplied to the evaluation packed tower 20 deteriorates over time. The calculation unit 30 calculates the time (0.5 years in the example shown in Figure 2) until the water quality measured by the measuring instrument 310 reaches a preset threshold value after the evaluation packed tower 20 is filled with activated carbon and the water to be treated is supplied as the arrival period. If the usage period is 2 years, 2 (years) + 0.5 (years) = 2.5 (years) is calculated as the recommended replacement period of the activated carbon.

[0021] The calculated recommended replacement period can be used as a guideline for determining the replacement timing of the activated carbon filled in the packed towers other than the packed tower (packed tower 10-1 in the above example) where the activated carbon used for the calculation was filled, and the next replacement timing of the activated carbon filled in the packed tower 10-1. For example, the recommended replacement period calculated using the activated carbon filled in the packed tower 10-1 can be used as a guideline for determining the replacement timing of the activated carbon filled in the packed tower 10-2. Also, the recommended replacement period calculated using the activated carbon filled in the packed tower 10-2 can be used as a guideline for determining the replacement timing of the activated carbon filled in the packed tower 10-3. Also, the recommended replacement period calculated using the activated carbon filled in the packed tower 10-3 can be used as a guideline for determining the replacement timing of the activated carbon filled in the packed tower 10-4. The recommended replacement period itself serving as this guideline may be used as the next replacement timing of the activated carbon, or a period shorter than the recommended replacement period by a predetermined period considering the safety side may be used as the next replacement timing of the activated carbon. At this time, the recommended replacement period to be presented may be determined by multiplying the calculated recommended replacement timing by a coefficient (margin rate) as described above. For example, when the calculated recommended replacement period is 2.5 years as described above and 0.9 is set as the coefficient, 2.5×0.9 = 2.25 (years) It may be used as the recommended replacement period to be presented. Such a calculation using a coefficient may be performed for each replacement of the packed tower and updated. That is, the recommended replacement period calculated using the coefficient may become a period in which the coefficient is further multiplied by the recommended replacement period after the next replacement. Thereby, it becomes possible to operate the packed tower without deteriorating the treated water quality with respect to the raw water with fluctuating loads. Particularly when the raw water load is gradually increasing, there is a risk that the water quality of the water treated by the existing packed towers 10-1 to 10-4 may deteriorate at a stage earlier than the recommended replacement period calculated using the evaluation packed tower 20. By setting the recommended replacement periods of the packed towers 10-1 to 10-4 using a coefficient (margin rate) and frequently updating the results obtained using the evaluation packed tower 20, the risk of water quality deterioration can be reduced.

[0022] After the above-described treatment, the activated carbon filled in the evaluation packed tower 20 is removed, and at least a part of the activated carbon filled in the packed tower 10-2 is filled in the evaluation packed tower 20, and the same treatment may be performed. That is, the above-described treatment may be repeated by rotating according to the replacement order of the activated carbon scheduled for the packed towers 10-1 to 10-4.

[0023] Note that the timing of removing the activated carbon from the packed towers 10-1 to 10-4 may be any timing other than the timing of replacing the activated carbon filled in the packed towers 10-1 to 10-4 with unused activated carbon. For example, during the operation of the packed tower 10-1, a part of the activated carbon filled in the packed tower 10-1 may be taken out at a predetermined timing, and the taken-out activated carbon may be filled in the evaluation packed tower 20 and the water to be treated may be supplied. In this case, the period from when the water to be treated starts to be supplied to the packed tower 10-1 until a part of the activated carbon is taken out is the usage period.

[0024] Since the quality of the raw water varies, the calculation unit 30 may adjust the calculated recommended replacement period according to the measurement result of the measuring instrument 300. For example, when the water quality measured by the measuring instrument 300 is lower than a preset threshold value, the calculated recommended replacement period may be adjusted to a longer period.

[0025] In the case where the capacities of the activated carbon filled in each of the packed towers 10-1 to 10-4 are different from each other, the water flow rate per unit of the activated carbon is calculated for each of the packed towers 10-1 to 10-4, and based on the calculated water flow rate, the recommended replacement period of the activated carbon is calculated, whereby the present invention can be applied.

[0026] Also, a so-called backwash may be periodically performed in a direction opposite to the normal water flow direction, that is, water is passed from the lower part to the upper part of the evaluation filling tower 20 to remove turbidity and impurities deposited in the evaluation filling tower 20. Regular backwashing is performed on the filling towers 10-1 to 10-4. Therefore, by performing backwashing on the evaluation filling tower 20, the water flow state of the filling towers 10-1 to 10-4 can be reproduced more accurately using the evaluation filling tower 20. For example, the timing of performing backwashing on the filling towers 10-1 to 10-4 and the timing of performing backwashing on the evaluation filling tower 20 may be the same timing. Also, the period of performing backwashing on the filling towers 10-1 to 10-4 and the period of performing backwashing on the evaluation filling tower 20 may be the same period. Also, in the process of performing backwashing, a valve for controlling the water flow rate from the lower part to the upper part of the evaluation filling tower 20 is provided, and the valve is controlled so that the superficial velocity SV and the linear velocity LV of the evaluation filling tower 20 as described above are equivalent to the superficial velocity SV and the linear velocity LV of the filling towers 10-1 to 10-4.

[0027] In this way, the water to be treated is supplied to a plurality of filling towers 10-1 to 10-4 installed in parallel with each other. After supplying the water to be treated to the first filling tower among the plurality of filling towers 10-1 to 10-4 during a predetermined usage period, at least a part of the packing material filled in the first filling tower is filled into the evaluation filling tower 20. The evaluation filling tower 20 is filled with activated carbon, and the arrival period until the water quality of the treated water treated in the evaluation filling tower 20 reaches a predetermined threshold value after the water to be treated is supplied is calculated. Based on the usage period and the arrival period, the recommended replacement period of the packing material is calculated. Thereby, it is possible to quickly present a more accurate replacement time of the packing material without affecting the actual operation. Further, the water to be treated with a water flow rate corresponding to the capacity of the packing material filled in the evaluation filling tower 20 is supplied to the evaluation filling tower 20. Thereby, even when a packing material having a capacity different from the capacity of the packing material filled in the filling tower from which the packing material has been removed is filled in the evaluation filling tower 20, it is possible to present the accurate replacement time of the packing material. (Second Embodiment)

[0028] FIG. 3 is a diagram showing a second embodiment of the water treatment system of the present invention. As shown in FIG. 3, the water treatment system in this embodiment includes a plurality of packed towers 10-1 to 10-4, an evaluation packed tower 20, measuring devices 300 and 310, and a calculation unit 31. Each of the components other than the calculation unit 31 is the same as that in the first embodiment.

[0029] Information for determining the timing at which the activated carbon filled in the plurality of packed towers 10-1 to 10-4 and through which the water to be treated flows is replaced with unused activated carbon is different from the information (time) in the first embodiment. In this embodiment, after the unused activated carbon is filled in the packed towers 10-1 to 10-4 and the water flow starts, the load amount (raw water load) applied to the activated carbon becomes information for determining the timing at which the activated carbon through which the water to be treated flows is replaced with unused activated carbon. This load amount D as the raw water load, for example, when the TOC indicating the quality of the water to be treated flowing through the activated carbon is A [mg / L], the water flow rate is B [L], and the amount of activated carbon is C [m 3 , then D [mg / m 3 = A [mg / L] × B [L] / C [m 3 becomes the load amount per unit activated carbon. The value indicating the quality of the water to be treated flowing through the activated carbon is the value measured by the measuring device 300. The value indicating the quality of the water to be treated flowing through the activated carbon is not limited to TOC, and may also be the residual chlorine concentration, turbidity, pH, etc. Similar to the first embodiment, in order to avoid the entire packed towers 10-1 to 10-4 from stopping operation due to the overlapping of the timing of replacing the activated carbon in the parallel arranged packed towers 10-1 to 10-4, it is necessary to shift the timing of the first start of water flow to each of the packed towers 10-1 to 10-4. The period from when the unused activated carbon is filled in the packed towers 10-1 to 10-4 and the water flow starts until at least a part of the activated carbon is filled in the evaluation packed tower 20 is the service period described in the first embodiment.

[0030] ​The calculation unit 31 calculates the raw water load applied to the evaluation packed tower 20 from when the evaluation packed tower 20 is filled with activated carbon and the treated water is supplied until the water quality measured by the measuring instrument 310 reaches a predetermined threshold value. The period from when the treated water is supplied to the evaluation packed tower 20 until the water quality measured by the measuring instrument 300 reaches a predetermined threshold value is the arrival period. The calculation unit 31 calculates the recommended raw water load for replacing the activated carbon based on the raw water load applied to the packed towers 10-1 to 10-4 during the above-described usage period and the raw water load applied to the evaluation packed tower 20 during the calculated arrival period. The calculation unit 31 sets the calculated recommended replacement raw water load as the recommended raw water load for replacement. For example, if the raw water load applied to the activated carbon filled in the packed towers 10-1 to 10-4 during the above-described usage period is 1.0 [t / m 3 , and the raw water load applied to the activated carbon filled in the evaluation packed tower 20 during the arrival period is 0.6 [t / m 3 , the calculation unit 31 calculates the period until the time when a raw water load of 1.6 [t / m 3 is applied after starting to pass water through the unused activated carbon as the recommended replacement period for the activated carbon. The recommended replacement period calculated by the calculation unit 31 may be displayed on a display unit such as a display, may be printed and output, or may be output as sound.

[0031] Figure 4 is a graph showing an example of the change in the raw water load of the water quality measured by the measuring instrument 310 in accordance with the raw water load applied to the evaluation packed tower 20 shown in Figure 3 from when the treated water is supplied. The vertical axis shown in Figure 4 indicates that the higher the value is on the upper side, the worse the water quality is. As shown in Figure 4, the water quality measured by the measuring instrument 310 after the treated water is supplied to the evaluation packed tower 20 decreases as the raw water load applied to the activated carbon filled in the evaluation packed tower 20 increases. The calculation unit 31 calculates the time corresponding to the raw water load (in the example shown in Figure 4, 0.6 [t / m 3 ) applied to the activated carbon filled in the evaluation packed tower 20 from when the treated water is supplied to the evaluation packed tower 20 until the water quality measured by the measuring instrument 310 reaches a preset threshold value as the arrival period. If the raw water load applied to the activated carbon filled in the packed towers 10-1 to 10-4 during the usage period is 1.0 [t / m 3 , then 1.0 [t / m3 +0.6[t / m 3 =1.6[t / m 3 becomes the recommended raw water load for replacement of the activated carbon.

[0032] The recommended replacement period corresponding to the calculated recommended raw water load for replacement can be used as a guideline for determining the replacement timing of the activated carbon filled in the packed towers other than the packed tower (packed tower 10-1 in the above example) in which the activated carbon used in the calculation was filled (packed towers 10-2 to 10-4), or the next replacement timing of the activated carbon filled in the packed tower 10-1. For example, the recommended replacement period corresponding to the calculated recommended raw water load for replacement using the activated carbon filled in the packed tower 10-1 can be used as a guideline for determining the replacement timing of the activated carbon filled in the packed tower 10-2. Also, the recommended replacement period corresponding to the calculated recommended raw water load for replacement using the activated carbon filled in the packed tower 10-2 can be used as a guideline for determining the replacement timing of the activated carbon filled in the packed tower 10-3. Also, the recommended replacement period corresponding to the calculated recommended raw water load for replacement using the activated carbon filled in the packed tower 10-3 can be used as a guideline for determining the replacement timing of the activated carbon filled in the packed tower 10-4.

[0033] After the above-described treatment, the activated carbon filled in the evaluation packed tower 20 can be removed, at least a part of the activated carbon filled in the packed tower 10-2 can be filled in the evaluation packed tower 20, and the same treatment can be performed. That is, the above-described treatment may be repeated by rotating according to the replacement order of the activated carbon scheduled for the packed towers 10-1 to 10-4.

[0034] ​Note that the timing of removing the activated carbon from the packed towers 10-1 to 10-4 may be any timing other than the timing of replacing the activated carbon packed in the packed towers 10-1 to 10-4 with unused activated carbon. For example, during the operation of the packed tower 10-1, a part of the activated carbon packed in the packed tower 10-1 may be taken out at a predetermined timing, and the taken-out activated carbon may be packed in the evaluation packed tower 20 and the water to be treated may be supplied. In this case, the raw water load applied to the activated carbon packed in the packed tower 10-1 from the start of the supply of the water to be treated to the packed tower 10-1 until the activated carbon is taken out is used for calculating the recommended raw water load for replacement.

[0035] Since the water quality of the raw water fluctuates, the calculation unit 31 may adjust the recommended replacement period that becomes the calculated recommended raw water load according to the measurement result of the measuring instrument 300. For example, when the water quality measured by the measuring instrument 300 is lower than a preset threshold value, the recommended replacement period that becomes the calculated recommended raw water load may be adjusted to a longer period.

[0036] In this way, the water to be treated is supplied to the plurality of packed towers 10-1 to 10-4 installed in parallel with each other. After supplying the water to be treated to the first packed tower among the plurality of packed towers 10-1 to 10-4 for a predetermined usage period, at least a part of the packing material packed in the first packed tower is packed in the evaluation packed tower 20. Calculate the raw water load applied to the activated carbon packed in the evaluation packed tower 20 until the water quality of the treated water treated in the evaluation packed tower 20 reaches a predetermined threshold value after the packing material is packed in the evaluation packed tower 20 and the water to be treated is supplied. Based on the raw water load applied to the activated carbon packed in the packed towers 10-1 to 10-4 during the usage period and the raw water load applied to the activated carbon packed in the evaluation packed tower 20 until the water quality of the treated water treated in the evaluation packed tower 20 reaches a predetermined threshold value after the water to be treated is supplied to the evaluation packed tower 20, calculate the recommended raw water load for replacement of the packing material. In this embodiment, the recommended replacement timing is presented according to the load of the packing material considering the fluctuation of the raw water quality. Thereby, it is possible to quickly present a more accurate replacement timing of the packing material according to the fluctuation of the raw water quality without affecting the actual operation. (Third Embodiment)

[0037] Generally, the water to be treated is supplied to a packed tower filled with a packing material from above the packed tower. The water to be treated supplied from an inlet provided above the packed tower passes through the packing material by gravity toward an outlet provided below the packed tower and is discharged from the outlet to the outside of the packed tower. Therefore, the packing material filled above the packed tower captures more impurities contained in the water to be treated than the packing material filled below the packed tower. In other words, the load on the packing material filled on the inlet side above the packed tower is greater than the load on the packing material filled on the outlet side below the packed tower. Thus, the load on the packing material varies depending on the position. Therefore, in this embodiment, the packing material transferred from the packed towers 10-1 to 10-4 in the configuration shown in FIG. 1 to the evaluation packed tower 20 is the one filled above the packed towers 10-1 to 10-4.

[0038] FIG. 5 is a diagram showing an example of the region of activated carbon transferred from the packed tower 10-1 shown in FIG. 1 to the evaluation packed tower 20. The activated carbon filled in the region one-third from the inlet side 10-11 of the packed tower 10-1, indicated by hatching in FIG. 5, is filled into the evaluation packed tower 20. In FIG. 5, an example is given in which the region of activated carbon transferred to the evaluation packed tower 20 is one-third from the inlet side 10-11 of the packed tower 10-1, but the extent from the inlet side 10-11 of the packed tower 10-1 may be appropriately set according to operating conditions and the like.

[0039] In this way, the packing material filled in a predetermined region above the packed towers 10-1 to 10-4 is filled into the evaluation packed tower 20. Since the replacement recommended period is calculated using the packing material that has been subjected to a greater load, the replacement recommended period of the packing material can be calculated on the safe side. (Fourth Embodiment)

[0040] As described in the third embodiment, the load on the packing material filled in the packed towers 10-1 to 10-4 through which the water to be treated flows is different depending on the position where it is filled. Therefore, the recommended replacement period calculated varies depending on the position in the packed towers 10-1 to 10-4 where the packing material transferred from the packed towers 10-1 to 10-4 to the evaluation packed tower 20 was filled. Thus, in this embodiment, in order to calculate a more accurate recommended replacement period for the packing material filled in the packed towers 10-1 to 10-4, the packing material filled in the packed towers 10-1 to 10-4 is taken out in predetermined amounts from various positions, mixed, and filled into the evaluation packed tower 20.

[0041] FIG. 6 is a diagram showing another example of the region of the activated carbon transferred from the packed tower 10-1 shown in FIG. 1 to the evaluation packed tower 20. At least a part of the activated carbon filled in the one-third region which is the first region from the inlet side 10-11 of the packed tower 10-1 as shown in FIG. 6, at least a part of the activated carbon filled in the one-third region which is the second region from the outlet side 10-12 of the packed tower 10-1, and at least a part of the activated carbon filled in the one-third region which is the third region between the first region and the second region of the packed tower 10-1 are extracted. The mixture of the extracted activated carbon is filled into the evaluation packed tower 20. Here, it is preferable that the mixing ratios are the same as each other. In FIG. 6, an example is given in which the region is one-third from the inlet side 10-11 and the outlet side 10-12 of the packed tower 10-1, but the extent from the inlet side 10-11 and the outlet side 10-12 of the packed tower 10-1 may be appropriately set according to operating conditions and the like.

[0042] In this way, the packing materials filled in a plurality of predetermined regions of the packed towers 10-1 to 10-4 are respectively extracted, mixed with each other, and filled into the evaluation packed tower 20. This predetermined region is a region such that the load on the mixed packing material is a value that averages the loads applied in each region. By using such a packing material to calculate the recommended replacement period, a more accurate recommended replacement period for the packing material can be calculated.

[0043] Combinations of the first embodiment and the third embodiment, combinations of the first embodiment and the fourth embodiment, combinations of the second embodiment and the third embodiment, and combinations of the second embodiment and the fourth embodiment are also possible.

Explanation of Signs

[0044] 10-1 to 10-4 Packed tower 10-11 Inlet side 10-12 Outlet side 11 Branch line 12 Confluence line 20 Evaluation packed tower 30, 31 Calculation unit 100, 110 Water tank 200 Sand filtration device 300, 310 Measuring instrument 400, 410 Pump 500 Valve

Claims

1. A plurality of filled parts filled with a filler and arranged in parallel with each other are supplied with treated water from one supply source, after supplying the treated water to the first filled part among the plurality of filled parts during a predetermined usage period, at least a part of the filler filled in the first filled part is filled in an evaluation filled part outside the plurality of filled parts, and the treated water is supplied to the evaluation filled part filled with the filler, measuring the water quality of the treated water treated in the evaluation filled part, A method for operating a water treatment system that calculates a recommended replacement period of the filler based on a value indicating the measured water quality.

2. In the operation method according to Claim 1, calculating an arrival period from when the treated water is supplied to the evaluation filled part until a value indicating the measured water quality reaches a predetermined threshold value, A method for operating a water treatment system that calculates a recommended replacement period of the filler based on the usage period and the arrival period.

3. In the operation method according to Claim 2, A method for operating a water treatment system that calculates a recommended replacement period of the filler based on the usage period, the arrival period, and a predetermined coefficient.

4. In the operation method according to Claim 1, A method for operating the treated water is supplied to the evaluation filled part so that the superficial velocity to the evaluation filled part is equal to the superficial velocity to the filled part.

5. In the operation method according to Claim 2, calculating a raw water load based on at least one value of the conductivity, TOC (Total Organic Carbon), residual chlorine concentration, turbidity, and pH of the treated water supplied to the plurality of filled parts during the usage period, A method for operating that calculates the recommended replacement period based on the raw water load applied to the filler filled in the plurality of filled parts during the usage period and the raw water load applied to the filler filled in the evaluation filled part during the arrival period.

6. In the operation method according to Claim 1 or Claim 2, The filler filled in the evaluation filled part is the filler filled in a predetermined area from the inlet side of the first filled part.

7. In the operation method according to Claim 1 or Claim 2, The filler filled in the evaluation filling part is a filler obtained by mixing the filler filled in the first region from the inlet side of the first filling part, the filler filled in the second region from the outlet side of the first filling part, and the filler filled in the third region between the first region and the second region. Operating method.

8. In the operating method according to claim 1, An operating method of a water treatment system that calculates a recommended replacement period of the filler filled in the plurality of filling parts based on the value indicating the measured water quality.

9. A plurality of filling parts installed in parallel with each other and filled with a filler, A supply unit that supplies raw water to the plurality of filling parts from one supply source, After supplying the raw water to the first filling part among the plurality of filling parts for a predetermined period of use, at least a part of the filler filled in the first filling part is filled, and an evaluation filling part to which the raw water is supplied, A calculation unit that calculates the arrival period until the value indicating the water quality of the treated water treated in the evaluation filling part reaches a predetermined threshold after the raw water is supplied to the evaluation filling part, and calculates the recommended replacement period of the filler based on the use period and the arrival period. A water treatment system having

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