JPH0732912B2 - Submersible water disinfectant - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a novel water disinfecting device that is immersed in water in a water tank or the like to sterilize and disinfect water.

<Problems to be solved by the conventional technology and invention> In the water supply system that has entered the highly popularized era, the length of the pipeline is lengthened, and in order to maintain the effective chlorine concentration at the end of the pipeline at 0.1 ppm or more, It is necessary to inject a large amount of chlorine at the water purification plant. However, when excessive chlorine is injected at the water treatment plant, trihalomethane, which is a carcinogen, is generated, and the effective chlorine concentration near the water treatment plant becomes close to 0.5 ppm, which causes health problems. To do. Also, when the effective chlorine concentration exceeds 0.4 ppm, a strong chlorine odor is felt, and the water becomes unsuitable as a drink.

Therefore, the effective chlorine concentration at the end of the pipeline should be 0.1 to 0.2 ppm.
Although it is desirable to maintain it at a level, a simple dedicated water supply (currently 10 m ³
In facilities with the above water tanks) and small elevated water tanks such as rooftops of buildings and condominiums, if the residual chlorine is low from the beginning as described above, the effective chlorine concentration during storage may drop to 0.1 ppm or less. is there. When the effective chlorine concentration decreases, the sterilizing power decreases, and various bacteria and pathogenic bacteria that have invaded the water tank proliferate, and there is a risk of causing digestive system infectious diseases and the like.

Therefore, it is possible to re-inject chlorine into the water in the water storage tank to sterilize and disinfect it.
It is a method of using chlorine which must be stored and transported in a liquefied state at high pressure, which is highly poisonous and has strong corrosiveness, and sodium hypozinc acid sodium solution which is extremely unstable and requires careful handling, and is highly toxic. Therefore, it takes time and effort for safety measures and maintenance of the equipment, and it is almost impossible to implement simply in a relatively small-scale water storage tank. There is also a method of generating sodium hypozinc acid sodium by saltless electrolysis using salt water as a raw material, but in this method, since sodium chloride is used as a raw material, there is a problem that it takes time to replenish it.

Further, each of the above methods is originally for injecting chlorine at a high concentration in a water purification plant, so it is not suitable for extremely low chlorine injection of about 0.1 to 0.2 ppm, which does not cause health problems. .

The present invention has been made in view of the above circumstances,
A low concentration that can be easily installed in a relatively small-scale reservoir, does not require replenishment of raw materials, is easy to maintain and is safe, and does not cause health problems. It is an object of the present invention to provide a simple water disinfection device suitable for chlorine sterilization.

<Means for Solving the Problems> In order to solve the above problems, the present inventors utilize a trace amount of chloride contained in fresh water to generate sodium hypochlorite by electrolysis, We considered increasing the available chlorine concentration. That is, if water containing chloride of about 70 ppm ± 50 ppm is electrolyzed, sodium hypochlorite that exceeds 0.1 ppm, which is a level sufficient for sterilizing and disinfecting germs such as pathogenic bacteria, is generated, and effective chlorine is generated. They found that the concentration could be 0.1-0.2ppm. Therefore, as a result of further studies on the structure of a device capable of simply performing electrolysis in a relatively small-scale water storage tank or the like, the present invention has been completed. Therefore, the underwater immersion type water disinfecting device of the present invention,
The whole is formed in a columnar shape, and the inside thereof is opened to the outside at one end face of the pillar along the longitudinal direction of the pillar,
And a water hole having a shape in which the opposite side is closed, and a disinfecting device main body having a through hole communicating from the inner part of the water passing hole to the outer surface of the pillar, and in the water passing hole of the disinfecting device main body, A pair of electrodes or a pair of electrodes that generate sodium hypochlorite by non-diaphragm electrolysis from chloride contained in water, which are arranged in a state of being directly opposed to each other at a predetermined interval, and on the counter electrode. A drive control unit that supplies electric power for electrolysis and the drive control unit are electrically connected to the counter electrode, and the disinfectant body is placed so that the end surface on the opening side of the water passage hole is located downward and the water passage hole is And a cable for suspending in the water with the end on the closed side facing up.

<Operation> In the underwater immersion type water disinfecting apparatus of the present invention having the above-mentioned configuration, hypochlorite is directly extracted from chloride contained in water by a pair or multiple pairs of electrodes by diaphragmless electrolysis. Since soda is generated, there is no need to replenish raw materials other than water, and there is no fear of producing toxic chlorine.
Further, since the electrolysis can be carried out simply by immersing the main body of the disinfecting device supporting the counter electrode in the water while being suspended by the cable, the installation becomes easy. Further, according to the underwater immersion type water disinfecting device of the present invention, since the through hole communicating to the outer surface is formed in the inner part of the water passing hole, when the disinfecting device main body is immersed in water, air is introduced into the water passing hole. It is possible to prevent the residual gas from remaining and to remove the gas (mainly hydrogen gas) generated when the chloride in the water is electrolyzed from the water passage hole through this passage hole. It is possible to continuously introduce fresh water into the water holes by causing an upward flow in the water.

<Example> Hereinafter, the present invention will be described with reference to the drawings illustrating an example.

As shown in FIG. 3, the submersible water disinfectant of this embodiment is a disinfectant main body 1 that is suspended in water such as a water tank T.
And a drive control unit 2 for supplying electric power for electrolysis to the disinfectant main body 1, and a cable 3 that electrically connects the drive controller 2 and also serves as a wire for suspending the disinfectant main body 1 in water. And provided in the middle of this cable 3,
The suspending tool 4 for the disinfectant body 1 is provided.

As shown in FIGS. 1 (a), (b) and FIG. 2, the sterilizer main body 1 is formed in a quadrangular prism shape with a cable 3 connected to one end, and from the other end face 10, A water passage hole 11 having a rectangular cross section is formed in the longitudinal direction of the quadrangular prism toward the direction of the cable 3. A pair of long plate-shaped electrodes 5 and 6 are arranged on the opposite wall surfaces of the water passage hole 11 so as to face each other at a predetermined interval.

As the pair of electrodes 5 and 6, various materials can be used, but in particular, like the conventional one used for diaphragmless electrolysis, the surface of the titanium plate is coated with platinum or a platinum alloy. What was done is used suitably.
The electrode having the above-mentioned configuration is less consumed during electrolysis and has excellent durability. Therefore, when the electrode having the above structure is used, the maintenance of the device can be reduced to about once a year. The same electrode can be used for about 5 to 10 years.

The water treatment capacity of the submersion type water disinfector is
It depends on the generation capacity of sodium hypochlorite, that is, the generation capacity of effective chlorine.The effective chlorine generation capacity depends on the distance between the electrodes 5 and 6, the size of each electrode 5 and 6, and the electrodes 5 and 6. Since it depends on the supplied power, the distance between the electrodes 5 and 6 should be adjusted according to the amount of water to be treated, such as the volume of the water tank T.
The size of each electrode 5, 6 and the power supply must be set. For example, in order to sterilize water in a small water storage tank having a volume of 20 m ³ or less, it is necessary to generate about 2 g of sodium hypochlorite equivalent to chlorine per day. For example
Current density D _{A in} water containing 20ppm chloride converted to NaCl
If a current of 2 A is applied under the condition of = 1.25 A / dm ² , in order to generate sodium hypochlorite equivalent to 2 g of chlorine per day, 4 mm long, 40 mm wide, 1.5 mm thick electrode It may be arranged at intervals of.

Similarly, in the case of a medium-sized water tank with a volume of about 100 m ³ ,
It is sufficient to use two submersible water disinfecting devices that can generate sodium hypochlorite equivalent to about 6 g of chlorine per day, and 12 g per day for a medium-sized water storage tank with a volume of about 300 m ^3.
It is sufficient to use two submersible water disinfecting devices that can generate sodium hypochlorite corresponding to a certain amount of chlorine.

At the innermost portion of the water passage hole 11, two through holes 11a, 11a are formed which communicate with the upper outer surface of the disinfectant body 11. This through hole 11a, 1
The 1a prevents air from remaining in the water passage hole 11 when the disinfecting device main body 11 is immersed in water, and also generates gas (mainly hydrogen gas) generated when electrolyzing chloride in water. Water hole 11
It is for removing the gas from the inside and for causing an upward flow of the water in the water passage hole 11 by the above gas removal.

Further, four slits 11b, 11b ... Which communicate with the outer surface of the side portion of the disinfecting device main body 11 are formed on the side portion of the water passage hole 11. The slits 11b, 11b ... Are for introducing new water into the water passage hole 11 together with the inlet 11c of the water passage hole 11 when the upward flow occurs.

The disinfectant body 1 is preferably formed of a material having excellent alkali resistance so as not to deteriorate due to generated sodium hypochlorite. Further, since it supports a pair of electrodes, it is preferable that it also has excellent insulating properties. Materials satisfying the above conditions include thermosetting and thermoplastic synthetic resins. The size of the disinfectant main body 1 depends on the size of the electrodes 5 and 6, the amount of treated water, etc.
To arrange electrodes 5 and 6 with m, width 40 mm, and thickness 1.5 mm at intervals of 4 mm, the diameter is 50 mm, the length is 455 mm, and the size of water passage hole 11 is 4 ± 1 mm in height, 40 mm in width, 400 mm in depth. Anything is fine.
Further, the diameter of the through hole 11a may be about 15 mm.

A water level sensor 7 for detecting the water level is provided on the outer surface of the disinfectant body 1 at a position above the through hole 11a.
As the water level sensor 7, an electrode-type sensor that detects the presence or absence of water at the position where the sensor is installed is preferably used depending on the presence or absence of conduction between the pair of electrodes.

In addition, at a position on the outer surface of the disinfecting device main body 1 on the side opposite to the side where the water level sensor 7 is provided and below the through hole 11a,
Flow velocity sensor 8 for detecting the flow velocity of water around the disinfectant body 1
Is provided. As the flow velocity sensor 8, a specific heat type sensor that uses a temperature sensor such as a thermistor to measure the flow velocity from heat loss due to water flow is preferably used.

The pair of electrodes 5, 6 and the water level sensor 7 and the flow velocity sensor 8
Are connected to the core wires 31, 31, ... Of the cable 3, and are electrically connected to the drive control section 2 via the cable 3, as shown by the chain double-dashed line in FIG.

As the cable 3, a cable in which the core wires 31, 31, ... Are protected by an insulating material having excellent water resistance such as EP rubber is used.
The length and diameter of the cable 3 are not particularly limited and can be appropriately changed according to the size of the water tank T to be used, etc. Normally, a cable with a diameter of 9 mm and a length of about 15 m should be used. .

As shown in FIG. 3, the suspension support tool 4 provided in the middle of the cable 3 is placed on the hole T1 on the upper surface of the water storage tank T to suspend the disinfectant main body 1 in the water storage tank T. At the same time, it is for securing a hole for exhausting the gas, and it is preferable that the fixing position with respect to the cable 3 can be appropriately changed according to the depth of the water tank T or the like.

The drive control unit 2 has a pair of electrodes 5, 6 as shown in FIG.
In addition, the power supply unit 20 that supplies power for electrolysis, and the power supply unit 20 is controlled based on signals from the water level sensor 7, the flow velocity sensor 8 and the like to control the power supplied to the electrodes 5 and 6. And a control unit 21 for controlling. The signals from the water level sensor 7 and the flow velocity sensor 8 are relay 22 and amplifier, respectively.
It is transmitted to the control unit 21 via 23.

The power supply unit 20 is for rectifying the current of AC100V or AC200V from the power supply 9, transforming it into a voltage required for electrolysis, and supplying the voltage to the pair of electrodes 5,6. 6 and the polarity reversing device 27. This polarity reversing device 27 switches the polarity of the current applied to the pair of electrodes 5 and 6 to alternately use the electrodes 5 and 6 as anodes, and one of the electrodes is consumed unilaterally. Used to prevent that. In addition, the power supply unit 20
A meter 28 for displaying the amount of current, the amount of voltage, etc. can be connected to the.

The control unit 21 is connected to a data input unit 24 for inputting initial data such as the volume of the water tank and the amount of treated water, and a display unit 25 for displaying the operating state of the device. Control unit
A manual / automatic changeover switch is provided between the power source unit 20 and the power source unit 20 when the power source unit 20 is manually operated without using the control unit 21.

As described above, the control unit 21 controls the power supply unit 20 based on the signals from the water level sensor 7, the flow velocity sensor 8 and the like,
By controlling the electric power supplied to the electrodes 5 and 6, arithmetic control is performed in order to prevent excessive available chlorine from being generated.

An example of arithmetic control is shown below.

First, the control unit 21 detects the water level in the water tank T and the water flow in the water tank T with the water level sensor 7 and the flow velocity sensor 8. Then, when the water level is above the position of the disinfectant main body 1 and there is no water flow or there is a slight water flow,
The control unit 21 supplies electric power from the power supply unit 20 to the electrodes 5 and 6 for a certain period of time to execute sterilization. Then, after a certain period of time, the supply of electric power from the power supply unit 20 to the electrodes 5 and 6 is temporarily stopped, and at that time, if there is no water flow or there is a slight water flow, it is effective chlorine if left as it is. Since the concentration will decrease, re-disinfection is performed. On the other hand, when the water level in the water storage tank T is lower than the position of the disinfectant body 1, the water level is insufficient, so the control unit 21 stops the supply of power from the power supply unit 20 to the electrodes 5 and 6. .

In addition, the pattern of the above-mentioned arithmetic control is the data input unit 24
Alternatively, it can be changed by operating the manual / automatic switch 26.

According to the submersion type water disinfecting apparatus of this embodiment having the above-mentioned configuration, sodium hypochlorite is generated by electrolyzing chloride contained in water using the pair of electrodes 5 and 6. Therefore, it is not necessary to replenish raw materials other than water. Also,
Electrolysis can be performed simply by suspending the disinfecting device main body 1 supporting the pair of electrodes 5 and 6 in water and connecting the drive control unit 2 to the power source 9, so that the installation is easy and requires almost no space. do not do. Also, when the electrodes 5 and 6 wear out,
Only the device body 1 supporting these electrodes 5, 6 needs to be replaced.

The configuration of the submersible water disinfecting apparatus of the present invention is not limited to the embodiment shown in the drawings.

For example, in the above embodiment, the disinfectant body 1 was formed of thermoplastic synthetic resin into a cylindrical shape, but
As the material, various thermosetting resins such as phenol resin and melamine resin, glass, ceramics and other insulating materials can be used.

As for the shape of the sterilizer body 1, various shapes such as a cylinder can be adopted. Further, in order to stabilize the state in water, paddles or fins may be provided on the outer surface of the sterilizer main body 1.

In the illustrated embodiment, the two through holes 11a are provided at the innermost portion of the water through holes 11, but the number of the through holes may be one, or conversely, three or more. good. The same applies to the slit 11b, and the number of slits may be three or less,
On the contrary, it may be five or more.

The circuit configuration of the drive control unit 2 is not limited to that in the illustrated embodiment.

The material, size, shape, arrangement, etc. of the electrodes 5, 6 can be changed as appropriate.

In the underwater immersion type water disinfecting apparatus of the embodiment shown in the figure, the disinfecting device main body 1 supporting the pair of electrodes 5 and 6 was suspended in water for use in the water storage tank. The vessel can also be used in addition to the water tank. For example, the device body may be used by inserting it into the water distribution conduit.

In the above embodiment, a pair of electrodes 5 and 6 were provided,
There may be two or more pairs of electrodes.

In addition, various design changes can be made without changing the gist of the present invention.

<Effects of the Invention> The underwater immersion type water disinfecting device of the present invention is configured as described above, and it is not necessary to replenish raw materials other than water. Therefore, maintenance of equipment is easy, and the counter electrode is used. The installation is completed simply by immersing the main body of the disinfectant supporting water in a water tank, so it can be easily installed in a relatively small-scale water tank, etc., and it is safe and does not pose a problem as drinking water. It is suitable for low concentration chlorine injection.

[Brief description of drawings]

FIG. 1 (a) is a partially cutaway front view of a disinfecting device main body in one embodiment of the submersible water disinfecting device of the present invention, and FIG. 1 (b) is a partially broken side view of the disinfecting device main body. FIG. 2 is a perspective view of the main body of the disinfecting device, FIG. 3 is a schematic view showing an installation state of the submersible water disinfecting device of the above embodiment in a water tank, and FIG. 4 is a drive control unit in the above embodiment. It is a block diagram which shows a structure. 1 ... Disinfector body, 2 ... Drive controller, 5, 6 ... Electrodes

Claims (1)

[Claims] 1. A water passage hole, which is formed in a columnar shape as a whole, and which is open to the outside at one end face of the column and closed on the opposite side along the longitudinal direction of the column. ,
The disinfecting device main body is formed with a through hole communicating from the inner part of the water passing hole to the outer surface of the column, and the disinfecting device main body is disposed in the water passing hole of the disinfecting device body so as to face each other at a predetermined interval. A pair of electrodes or a pair of electrodes that generate sodium hypochlorite by non-diaphragm type electrolysis from chloride contained in water, and a drive control unit that supplies electric power for electrolysis to the counter electrode. , While electrically connecting this drive control unit to the counter electrode, with the disinfecting device main body in a state where the end surface on the opening side of the water passage hole is on the bottom and the end portion on the side where the water passage hole is closed is on the top. An underwater immersion type water disinfection device, comprising: a cable for suspending in water.