JP2022141023A - Container water-treatment system and valve control method for container water-treatment system - Google Patents

Abstract

To provide a container water-treatment system that can easily and stably supply water for living, and a valve control method for the container water-treatment system.SOLUTION: A container water-treatment system includes a portable container, and a water treatment system accommodated in the container. The water treatment system includes a mixer that supplies a water mixture, consisting of to-be-treated water and a flocculant, and a filter that filters the water mixture supplied from the mixer.SELECTED DRAWING: Figure 3

Description

Applied for Article 30, Paragraph 2 of the Patent Law (1) Announced on July 1, 2020 at the introduction of the container package ceramic membrane filtration equipment lease method issued by METAWATER Co., Ltd. (2) September 2, 2020 https://www. meta water. co. jp/news/2020/09/post-84. Announced in html. (3) Announced in the September 10, 2020 Nihon Suido Shimbun published by Nippon Suido Shimbun on September 10, 2020. (4) Published on September 16, 2020, The Chemical Daily published by The Chemical Daily, September 16, 2020, page 10. (5) Announced on page 12 of the Suido Sangyo Shimbun dated October 5, 2020, published by Suido Sangyo Shimbun on October 5, 2020. (6) November 25, 2020 https://www. meta water. co. jp/news/2020/11/-biz-2020online. Announced in html. (7) Announced on November 26, 2020 at the lecture “Climate Change and Disaster Countermeasures Biz Online 2020”. (8) Announced on January 1, 2021 in the Environmental Newspaper published by Kankyo Shimbun on January 1, 2021.

The present invention relates to a contained water treatment system and a valve control method in a contained water treatment system.

For example, in a water purification plant, water purification equipment is used to remove suspended solids (SS) contained in raw water such as river water and well water (hereinafter simply referred to as raw water). Specifically, in such a water purification facility, for example, by mixing raw water with a flocculant, suspended solids contained in raw water are flocculated and precipitated and removed by filtration. As a result, at a water purification plant, for example, it becomes possible to generate safe domestic water from raw water (see Patent Literature 1).

JP-A-2008-296079

However, construction of a water purification plant as described above generally requires a large amount of cost and a sufficient space. Therefore, it may not be possible to construct a water purification plant even in an area where domestic water supply is required due to economic considerations, restrictions on construction sites, and the like.

Further, for example, when a disaster such as an earthquake occurs, there is a possibility that the operation of the water purification plant itself will stop. Therefore, when only the water purification equipment installed in the water purification plant is used, the supply of domestic water to each consumer's house may be stopped. That is, it is desired to provide a method for easily and stably supplying domestic water.

A contained water treatment system in the present invention for achieving the above object comprises a transportable container, and a water treatment system housed in the container, wherein the water treatment system includes water to be treated and coagulation A mixer for supplying mixed water mixed with an agent, and a filtering device for filtering the mixed water supplied from the mixer.

According to the housed water treatment system of the present invention, it is possible to easily and stably supply domestic water.

FIG. 1 is a diagram illustrating a configuration example of a contained water treatment system 100 according to the first embodiment. FIG. 2 is a graph illustrating a method of determining the amount of coagulant to be injected into the mixer 1. In FIG. FIG. 3 is a diagram illustrating a configuration example of a contained water treatment system 200 according to the second embodiment. FIG. 4 is a diagram illustrating a configuration example of a contained water treatment system 300 according to the third embodiment. FIG. 5 is a diagram illustrating a method of adjusting the amount of raw water supplied by the valve V4. FIG. 6 is a diagram illustrating a method of adjusting the amount of raw water supplied by the valve V4. FIG. 7 is a diagram illustrating a method of adjusting the amount of raw water supplied by the valve V4. FIG. 8 is a diagram illustrating a method of adjusting the amount of raw water supplied by the valve V4.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, such an embodiment does not limit the technical scope of the present invention.

[Accommodated water treatment system 100 in the first embodiment]
First, the contained water treatment system 100 in the first embodiment will be described.

FIG. 1 is a diagram illustrating a configuration example of a contained water treatment system 100 according to the first embodiment.

The contained water treatment system 100 has, for example, a container 10 and a water treatment system 20 housed in the container 10, as shown in FIG.

The container 10 is, for example, a portable container. That is, the container 10 is, for example, a container that can be transported by being loaded on a truck or the like. Note that the container 10 may be directly provided with a moving means such as a vehicle, for example.

The water treatment system 20 includes, for example, a mixer 1 that mixes raw water and a coagulant supplied from the outside of the container 10 to generate mixed water, and a filtering device that filters the mixed water generated by the mixer 1. 2. Hereinafter, raw water and mixed water are also collectively referred to as treated water. The water treatment system 20 also includes a storage tank 3 that stores the coagulant. The flocculant stored in the storage tank 3 is supplied to the mixer 1 by, for example, a pump P via valves V1 and V2. That is, the amount of coagulant supplied to the mixer 1 is adjusted by the pump P, for example. The valve V1 is, for example, a valve that is opened and closed when maintenance of the mixer 1, the filter device 2, etc. is performed, and the valve V2 is opened and closed for the purpose of stabilizing the supply of the coagulant to the mixer 1. It is a valve that is

The mixer 1 is, for example, an in-line mixer that injects and mixes the flocculant supplied from the storage tank 3 via the line L3 into the raw water supplied via the line L1 from the outside of the container 10. Then, the mixer 1 supplies the produced mixed water to the filtering device 2 through the line L2. The flocculant may be supplied through the line L1 and mixed with the raw water, or may be supplied directly to the mixer 1 and mixed with the raw water.

The filtration device 2 has, for example, a filtration membrane 2a that filters the mixed water supplied from the mixer 1 via the line L2. Specifically, the filtration device 2 has, for example, a plurality of filtration membranes 2a that perform filtration of mixed water in parallel. The filtration membrane 2a is, for example, a ceramic membrane.

Then, the filtering device 2 supplies the filtered mixed water to the outside of the container 10 .

The valve V3 is provided, for example, between the mixer 1 and the filtering device 2 (line L2), and is a valve capable of adjusting the amount of mixed water supplied to the filtering device 2 .

That is, in the housed water treatment system 100 according to the first embodiment, raw water is purified without using a mixing tank or the like for mixing the coagulant and raw water, unlike general water purification equipment. Specifically, the contained water treatment system 100 mixes the coagulant and raw water and forms flocs in the mixer 1 or in the mixer 1 and line L2.

As a result, the contained water treatment system 100 can omit the space required for purifying raw water, and can be made smaller than general water purifying equipment. Therefore, the contained water treatment system 100 can be transported by being mounted on a truck or the like, for example.

In addition, since the housed water treatment system 100 can reduce the number and size of components compared to general water purification equipment, it is possible to reduce costs compared to general water purification equipment.

Furthermore, the contained water treatment system 100 can be transported by being mounted on a truck or the like to purify raw water at a desired location. Therefore, the housed type water treatment system 100 can supply domestic water even in a place where a water purification plant cannot be constructed due to economic considerations or construction site restrictions. In addition, the contained water treatment system 100 can supply domestic water to areas where it is necessary, even in the event of a disaster, for example.

[Method for Determining Injection Amount of Flocculant]
Next, a method for determining the amount of coagulant to be injected into the mixer 1 will be described.

FIG. 2 is a graph illustrating a method of determining the amount of coagulant to be injected into the mixer 1. In FIG. In the graph shown in FIG. 2, the horizontal axis corresponds to the turbidity of the raw water, and the vertical axis corresponds to the injection amount of the coagulant per unit time.

The amount of coagulant injected into the mixer 1 (the amount of coagulant supplied to the valves V1 and V2) is determined, for example, according to the turbidity of the raw water supplied to the contained water treatment system 100 from the outside. Specifically, the amount of coagulant injected into the mixer 1 is determined according to the turbidity of the raw water measured by a turbidity meter (not shown) installed inside or outside the container 10, for example. .

More specifically, as shown in FIG. 2, for example, when the turbidity of the raw water is equal to or lower than the first turbidity, the operator adjusts the injection amount of the coagulant by the pump P, so that per unit time is adjusted so that the injection amount of is constant (first injection amount). Further, for example, when the turbidity of the raw water is equal to or higher than the first turbidity and equal to or lower than the second turbidity, the operator adjusts the injection amount of the coagulant by the pump P to reduce the turbidity of the raw water. Adjust so as to increase the injection amount per unit time according to the rise. Furthermore, for example, when the turbidity of the raw water is equal to or higher than the second turbidity, the operator adjusts the injection amount of the coagulant by the pump P so that the injection amount per unit time is constant (second injection amount ).

In this regard, when the turbidity of raw water is greater than or equal to the first turbidity and less than or equal to the second turbidity, in the example shown in FIG. However, the injection amount per unit time with respect to the turbidity of the raw water may increase at a pace other than constant.

The amount of coagulant to be injected into the mixer 1 may be determined by a control device (not shown) installed inside or outside the container 10, for example. The control device is, for example, a computer having a CPU (Central Computing Unit) and memory. Specifically, the control device may perform processing for determining the amount of coagulant to be injected into the mixer 1, for example, by using a signal transmitted from a turbidity meter (not shown).

Further, each of the valves V1 and V2 may be opened and closed automatically by a valve opening/closing device (not shown) installed in the container 10, for example. Specifically, the valve opening/closing device, for example, opens and closes the valves V1 and V2 so that the coagulant corresponding to the injection amount indicated by the signal transmitted from the control device is injected into the mixer 1. may

[Accommodated water treatment system 200 in the second embodiment]
Next, a contained water treatment system 200 according to the second embodiment will be described.

FIG. 3 is a diagram illustrating a configuration example of a contained water treatment system 200 according to the second embodiment. In the following, only points different from the contained water treatment system 100 described in the first embodiment will be described.

Generally, in water purification equipment, by injecting a flocculant into raw water, suspended matter contained in raw water is flocculated to form flocs. In the water purification facility, raw water is purified by precipitating and removing the formed flocs.

Here, in the water purification facility as described above, for example, the GT value is used as a criterion for judging whether or not favorable flocs are formed. The GT value is a value calculated by multiplying the G value, which indicates the strength of stirring between the raw water and the flocculant, by the T value, which indicates the duration of stirring between the raw water and the flocculant.

In this regard, in a general water purification facility, for example, since raw water and a coagulant are mixed in a mixing tank, it is possible to secure a sufficient GT value.

On the other hand, in the accommodation type water treatment system 100 described in the first embodiment, since it does not have a mixing tank due to the need to realize downsizing of the equipment, until the mixed water reaches the filtration device 2 It may not be possible to secure a sufficient time for mixing, and it may not be possible to secure a sufficient stirring time (T value) for the raw water and the flocculant. Therefore, in the contained water treatment system 100 in the first embodiment, mixed water in which the coagulant is not sufficiently mixed may reach the filtration device 2, and good flocs may not be formed.

Therefore, in the housing type water treatment system 200 in the second embodiment, as shown in FIG. The pump P2, which is less than the predetermined value, is used. Specifically, the pump P2 is, for example, a non-pulsating pump.

That is, for example, when a pump (for example, a pulsating pump) with a large change in the injection amount of the coagulant per unit time is used as the pump that supplies the coagulant to the mixer 1, the coagulant for the mixer 1 There is a possibility that the injection pace of the agent may be uneven. In this regard, in an environment where the T value can be sufficiently secured, such as a water purification facility having a mixing tank, it is possible to generate good flocs even when the pace of coagulant injection is uneven. In an environment where a sufficient value cannot be secured, there is a possibility that good flocs cannot be formed before reaching the filtering device 2 . Therefore, in the contained water treatment system 200 according to the second embodiment, as the pump for supplying the coagulant to the mixer 1, the pump P2 with small unevenness in the injection pace of the coagulant is used.

As a result, the contained water treatment system 200 can reduce the residence time required for floc formation. Therefore, the contained water treatment system 200 suppresses the occurrence of a case where the mixed water in which the coagulant is not sufficiently mixed reaches the filtration device 2 even in an environment where the T value cannot be sufficiently secured. It becomes possible to form good flocks.

[Accommodated water treatment system 300 in the third embodiment]
Next, a housed water treatment system 300 according to a third embodiment will be described.

FIG. 4 is a diagram illustrating a configuration example of a contained water treatment system 300 according to the third embodiment. Only differences from the housed water treatment system 100 described in the first embodiment and the housed water treatment system 200 described in the second embodiment will be described below.

As shown in FIG. 4, the water treatment system 20 has a pressure gauge 4a (hereinafter also referred to as first pressure gauge 4a) and a pressure gauge 4b (hereinafter also referred to as second pressure gauge 4b). The water treatment system 20 also has a valve V4 that adjusts the amount of raw water supplied to the mixer 1 .

The pressure gauge 4 a is installed, for example, between the valve V 4 and the mixer 1 (line L 1 ) to measure the flow pressure (pressure) of the raw water supplied to the mixer 1 .

The pressure gauge 4b is installed, for example, in the filtration device 2 to measure the flow pressure of the mixed water in the front stage of the filtration device 2 or the flow pressure difference (pressure difference) in the front and rear stages of the filtration device 2. In the following description, the pressure gauge 4b is a single pressure gauge. and a pressure gauge for measuring the flow pressure of the mixed water.

Also, the valve V4 is a valve that can adjust the supply amount of raw water, for example, based on the flow pressure measured by the pressure gauge 4a or the pressure gauge 4b. Specifically, the operator adjusts the amount of raw water supplied to the mixer 1 by opening and closing the valve V4, for example, and adjusts the flow pressure in the stage preceding the valve V3.

The determination of the amount of raw water to be supplied by the valve V4 may be performed by a control device (not shown) installed in the container 10, for example. Specifically, the control device, for example, by using the signal transmitted from the pressure gauge 4a or the signal transmitted from the pressure gauge 4b, even if it performs processing to determine the amount of raw water supplied by the valve V4 good.

Further, the opening and closing of the valve V4 may be automatically performed by a valve opening and closing device (not shown) installed in the container 10, for example. Specifically, the valve opening/closing device may, for example, open and close the valve V4 so that raw water corresponding to the supply amount indicated by the signal sent from the control device is supplied to the mixer 1 .

[Method for adjusting the amount of raw water supplied by valve V4]
Next, a method for adjusting the amount of raw water supplied by the valve V4 will be described.

5 to 8 are diagrams for explaining a method of adjusting the amount of raw water supplied by the valve V4. In the following, a description will be given of a case where the adjustment of the amount of raw water supplied by the valve V4 is performed manually.

As shown in FIG. 5, for example, when the first confirmation timing comes, the operator acquires the flow pressure of the mixed water supplied to the valve V3 from the pressure gauge 4a (YES in S11, S12). The first confirmation timing may be, for example, the timing when a predetermined time has passed after the supply of the mixed water to the filtration membrane 2a is started for the first time. Further, the first confirmation timing may be, for example, the timing when a predetermined time has passed after the filtration membrane 2a is washed.

Then, the operator determines whether or not the fluid pressure acquired in the process of S12 is equal to or greater than the first threshold (S13).

As a result, when it is determined that the flow pressure acquired in the process of S12 is equal to or higher than the first threshold (YES in S14), the operator reduces the amount of raw water supplied by the valve V4 (S15). Specifically, the operator reduces the amount of raw water supplied, for example, by manually closing the valve V4.

That is, immediately after starting supply of the mixed water to the filtration membrane 2a or immediately after washing the filtration membrane 2a, as shown in FIG. The flow pressure of the mixed water in the preceding stage of (filtering device 2) is in a low state. Therefore, in this case, if the fluid pressure in the stage before the valve V3 is large, the difference in fluid pressure between the fluid pressure in the stage before the valve V3 and the fluid pressure in the stage after the valve V3 becomes large, which may cause failure of the valve V3 or the like. . Specifically, if the difference in fluid pressure between the upstream fluid pressure and the downstream fluid pressure of the valve V3 is not within a predetermined range, for example, cavitation occurs in the valve V3, causing abnormal noise and failure. more likely.

Therefore, as shown in FIG. 6B, when the fluid pressure measured by the pressure gauge 4a is equal to or higher than the first threshold immediately after starting to supply the mixed water to the filtration membrane 2a or immediately after washing the filtration membrane 2a, The operator determines that there is a high possibility that the flow pressure difference between the upstream and downstream flow pressures of the valve V3 is large, and closes the valve V4 to reduce the amount of raw water supplied by the valve V4. That is, in this case, the operator performs control to close the valve V4 so that the pressure difference between the pressure before and after the valve V3 is within a predetermined range.

As a result, the contained water treatment system 300 can prevent the valve V3 from malfunctioning or the like.

In addition, as will be described later, the contained water treatment system 300 suppresses the amount of mixed water supplied to the filtering device 2 in order to increase the amount of mixed water supplied to the filtering device 2 at the necessary timing. It becomes possible to keep

Then, as shown in FIG. 7, for example, when the second confirmation timing comes, the operator determines the flow pressure of the mixed water supplied to the filtration device 2 (the flow pressure of the front stage of the filtration device 2) and the filtration device 2 (YES in S21, S22). The second confirmation timing may be, for example, timing when a predetermined time has passed after the processing of S14 is performed.

Then, the operator determines whether or not the flow pressure difference obtained in the process of S22 is equal to or greater than the second threshold (S23).

As a result, when it is determined that the flow pressure difference acquired in the process of S22 is equal to or greater than the second threshold (YES in S24), the operator increases the amount of raw water supplied by the valve V4 (S25). Specifically, the operator manually opens the valve V4 to increase the raw water supply amount.

That is, when the mixed water supply to the filtration membrane 2a continues for a long time, as shown in FIG. Become. Therefore, for example, when it is necessary to maintain the filtered amount of mixed water in the filtering device 2, by increasing the amount of mixed water supplied to the filtering device 2 with the passage of time, the flow pressure in the front stage of the valve V3 is increased. need to be bigger.

In this respect, for example, by separately providing a pump for increasing the supply amount of raw water to the mixer 1, it is possible to increase the supply amount of the mixed water to the filtering device 2. However, if the space inside the container 10 in the contained water treatment system 300 is not sufficient, it may not be possible to install a pump in the container 10 for increasing the amount of raw water supplied to the mixer 1.

Therefore, in the housed water treatment system 300 according to the present embodiment, when the flow pressure difference measured by the pressure gauge 4b becomes equal to or greater than the second threshold, clogging of the filtration membrane 2a occurs as shown in FIG. 8(B). It is determined that it is larger, and the valve V4 is opened to increase the amount of raw water supplied by the valve V4. That is, in this case, the operator performs control to open the valve V4 so that the pressure difference between the pressure before and after the valve V3 is within a predetermined range.

As a result, the contained water treatment system 300 can increase the amount of mixed water supplied to the filtering device 2, for example, without separately providing a pump for increasing the amount of raw water supplied to the mixer 1. . Therefore, in the housed water treatment system 300, even if the flow pressure difference in the filtration device 2 increases over time, it is possible to maintain the filtered amount of mixed water in the filtration device 2. FIG.

1: Mixer 2: Filtration device 2a: Filter membrane 3: Storage tank 4a: Pressure gauge 4b: Pressure gauge 10: Container 20: Water treatment system 100: Housed water treatment system 200: Housed water treatment system 300: Housed type water treatment system L1: Line L2: Line L3: Line P1: Pump P2: Pump V1: Valve V2: Valve V3: Valve V4: Valve

Claims (7)

a transportable container;
and a water treatment system housed in the housing,
The water treatment system includes
a mixer for supplying mixed water obtained by mixing the water to be treated and the coagulant;
and a filtration device that filters the mixed water supplied from the mixer. The water treatment system comprises a pump for injecting the flocculant into the mixer,
2. The contained water treatment system according to claim 1, wherein said pump is a pump whose change in the injection amount of said coagulant per unit time is a predetermined amount or less. 3. The contained water treatment system of claim 2, wherein said pump is a non-pulsating pump. The contained water treatment system according to claim 1 or 2, wherein said water treatment system comprises a first valve that adjusts the amount of said mixed water supplied to said filtering device. 5. The contained water treatment system according to claim 4, wherein said water treatment system comprises a second valve for adjusting the supply amount of said water to be treated to said mixer. A container that can be transported; and a water treatment system that is housed in the container, wherein the water treatment system includes a mixer that supplies mixed water in which water to be treated and a coagulant are mixed; A valve control method in a contained water treatment system, comprising: a filtration device for filtering the mixed water supplied from
According to the pressure of the water to be treated supplied to the first valve for adjusting the supply amount of the mixed water to the filtering device, the second valve for adjusting the supply amount of the water to be treated to the mixer A valve control method for controlling the supply amount of treated water. A container that can be transported; and a water treatment system that is housed in the container. A valve control method in a contained water treatment system, comprising: a filtration device for filtering the mixed water supplied from a vessel,
A second valve that adjusts the supply amount of the water to be treated to the mixer according to the pressure difference between the pressure of the mixed water supplied to the filtering device and the pressure of the mixed water supplied from the filtering device A valve control method for controlling the supply amount of the water to be treated.

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