JP2017205310A - Generation method and generation device for hypochlorous acid water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a generation device of hypochlorous acid water capable of generating hypochlorous acid water with predetermined pH and concentration by a simple structure without generating noxious gas.SOLUTION: In a generation device 1 of hypochlorous acid water, raw water is branched into first and second branch pipe paths 3 and 4. A sodium hypochlorite solution of predetermined concentration is intermittently supplied by a fixed quantity to raw water flowing in the first branch pipe path 3 by using a first metering pump 31, stirred and mixed through a first disc filter 41 and uniform diluted aqueous solution of sodium hypochlorite is obtained. Hydrochloric acid is intermittently supplied by a fixed quantity to raw water flowing in the second branch pipe path 3 by using a second metering pump 32, stirred and mixed through a second disc filter 42 and uniform diluted hydrochloric acid is obtained. By stirring and mixing the diluted solution of sodium hypochlorite and the diluted hydrochloric acid through a third disc filter 43, hypochlorous acid water with predetermined concentration and pH is generated.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hypochlorous acid water generation method and a generator for mixing hypochlorous acid water having a predetermined concentration and pH by mixing sodium hypochlorite aqueous solution and hydrochloric acid with raw water such as tap water.

  It is known to use hypochlorous acid water as sterilizing water for plants and the like. The present inventor has proposed a plant cleaning farming method using hypochlorous acid water in Patent Document 1. For example, by applying a cleaning farming method using hypochlorous acid water to cultivation of strawberry seedlings, strawberry anthracnose infection can be reliably prevented.

  As a method for producing hypochlorous acid water, an electrolytic method and a two-component method are known. When hypochlorous acid water is used as sterilizing water in agriculture or the like, the amount produced is insufficient in the electrolytic method, so the two-component method is adopted.

  Patent Document 2 proposes a sterilizing water production apparatus that generates hypochlorous acid water by a two-component method. In this sterilizing water manufacturing apparatus, sodium hypochlorite aqueous solution and hydrochloric acid are added to raw water to generate hypochlorous acid water having a predetermined pH value and a predetermined residual chlorine concentration.

Japanese Patent No. 5866147 Japanese Patent No. 3719589

  Here, sodium hypochlorite reacts with hydrochloric acid to generate toxic chlorine gas. For this reason, in the sterilizing water production apparatus disclosed in Patent Document 2, sodium hypochlorite and hydrochloric acid are separately diluted with raw water, and the diluted sodium hypochlorite aqueous solution and diluted hydrochloric acid are mixed, Controls the generation of toxic gases. In addition, the piping route is arranged so as to be directed downward in the vertical direction from the upstream side to the downstream side, and toxic gas is generated when sodium hypochlorite aqueous solution and hydrochloric acid come into contact with each other when the operation is interrupted or stopped. This makes it easy to vent the gas from the piping path.

  A conventional hypochlorite water generator by a two-component method such as a sterilizing water production apparatus disclosed in Patent Document 2 is a general turbo type for supplying (adding) sodium hypochlorite and hydrochloric acid to raw water. A pump (non-volumetric pump) is used. The pump is driven, and sodium hypochlorite and hydrochloric acid stored in the tank are supplied to the raw water through a piping path passing through the pump. When the operation is stopped, sodium hypochlorite and hydrochloric acid remaining in the piping path are returned to the tank via the circulation path including the piping path.

  In a conventional hypochlorous acid water generator, sodium hypochlorite and hydrochloric acid before being diluted with raw water flow along a pump and a piping path. There is a problem that the inside of the pump, piping, and the like are rapidly deteriorated by these chemical solutions, and the life is short. In addition, it is difficult to accurately generate hypochlorous acid water having a required pH value or residual chlorine concentration with a conventional two-component generator. Furthermore, as described in Patent Document 2, there is a restriction on the equipment layout such that the piping route must be arranged vertically. For these reasons, the generator of hypochlorous acid water by the two-component method has not been put to practical use until now.

  An object of the present invention is to provide a hypochlorous acid water generating method and generator capable of generating hypochlorous acid water having a predetermined pH value and concentration without generating a toxic gas with a simple configuration. is there.

In order to solve the above problems, the method for producing hypochlorous acid water of the present invention is as follows.
Forming a raw water stream supplied at a given pressure,
Branching the raw water stream into first and second branch streams;
Using a first metering pump, a predetermined concentration of sodium hypochlorite aqueous solution stored in the first chemical liquid tank is intermittently supplied to the first branch flow by a predetermined amount,
Stirring and mixing the first branched stream after the aqueous sodium hypochlorite solution is supplied to produce a uniform diluted aqueous stream of sodium hypochlorite;
The second branch flow is intermittently supplied with a predetermined amount of hydrochloric acid stored in the second chemical tank by a predetermined amount using a second metering pump,
Stirring and mixing the second branched stream after the hydrochloric acid is fed to produce a uniform diluted hydrochloric acid stream;
A dilute aqueous sodium hypochlorite stream and a dilute hydrochloric acid stream are combined and mixed by stirring to produce hypochlorous acid water having a predetermined concentration and pH,
Control the concentration and pH of the generated hypochlorous acid water, measure the flow rate of the supplied raw water, and supply the sodium hypochlorite aqueous solution and hydrochloric acid by the first and second metering pumps based on the measurement results It is characterized by being performed by increasing / decreasing the value.

The generator of hypochlorous acid water of the present invention is
An upstream pipeline,
A first branch pipe and a second branch pipe branching from the downstream end of the upstream pipe and joining again;
A downstream pipe line extending from a confluence of the downstream ends of the first and second branch pipe lines;
A raw water supply pump for pumping raw water from the upstream pipeline to the downstream pipeline via each of the first and second branch pipelines;
A first chemical tank for storing a sodium hypochlorite aqueous solution having a preset concentration;
A second chemical tank for storing hydrochloric acid having a preset concentration;
A first metering pump that intermittently supplies a predetermined amount of sodium hypochlorite aqueous solution from the first chemical solution tank to the raw water flowing through the first branch pipe;
A second metering pump that intermittently supplies hydrochloric acid from the second chemical tank to the raw water flowing through the second branch pipe by a predetermined amount;
In the middle of the first branch pipe, a first stirring mixer that stirs and mixes raw water after the sodium hypochlorite aqueous solution is supplied;
In the middle of the second branch pipe, a second stirring mixer that stirs and mixes raw water after hydrochloric acid is supplied;
A third stirring mixer for stirring and mixing a diluted aqueous solution of sodium hypochlorite and diluted hydrochloric acid flowing through the downstream side pipe;
It is characterized by having.

  In the present invention, it is desirable to use as a stirring mixer a disc filter provided with a laminated body of discs having grooves as a filtration part.

  In the present invention, a sodium hypochlorite aqueous solution and hydrochloric acid are supplied to raw water using a metering pump, for example, a diaphragm metering pump. The amount of hypochlorous acid aqueous solution and hydrochloric acid supplied to the raw water by the metering pump can be accurately controlled. Thereby, hypochlorous acid water having a preset pH value or residual chlorine concentration can be obtained with certainty.

  In addition, there are no drive parts such as a turbo type pump rotor and its bearings in the pump chamber of a metering pump through which sodium hypochlorite aqueous solution and hydrochloric acid flow. Therefore, these aqueous solutions deteriorate the pump and shorten its life. There is no possibility of becoming. Further, after the operation is stopped, high concentration sodium hypochlorite and hydrochloric acid do not remain in the pipe, and only a small amount of the diluted one remains in the mixing stirrer. Therefore, no toxic gas is generated and a gas venting mechanism is basically unnecessary.

  Furthermore, there is a high degree of freedom in the layout of the piping path, and there are few restrictions such as having to pipe in the vertical direction from upstream to downstream as in the prior art. Components such as piping can be easily incorporated into a box having a fixed shape such as a box shape. Therefore, according to this invention, the generator of hypochlorous acid water by a practical two-component method is realizable.

It is explanatory drawing which shows schematic structure of the generator of hypochlorous acid water to which this invention is applied.

  Hereinafter, embodiments of a hypochlorous acid water generator to which the present invention is applied will be described with reference to the drawings. FIG. 1 is an explanatory diagram showing a schematic configuration of a hypochlorous acid water generator. The hypochlorous acid water generator 1 includes an upstream pipe 2 and a first branch pipe 3 that branches from the downstream end of the upstream pipe 2 and branches as raw water pipes such as tap water. And a second branch pipe 4 and a downstream pipe 6 extending from the junction 5 at the downstream end of the first and second branch pipes 3 and 4. For example, a hard vinyl chloride pipe having a diameter of 40 mm is used. The piping path having this configuration is incorporated in the generator housing 7 indicated by a two-dot chain line in FIG.

  A water supply pump 8, an on-off valve 9, a pressure reducing valve 10, and a flow meter 11 are arranged in this order from the upstream side in the upstream side pipeline 2. Raw water such as tap water is pumped from the upstream pipeline 2 to the downstream pipeline 6 via the first and second branch pipelines 3 and 4 by the water supply pump 8. The flow meter 11 measures the flow rate of the raw water being pumped.

  The hypochlorous acid water generator 1 includes a first chemical liquid tank 21, a second chemical liquid tank 22, and a third chemical liquid tank 23. These tank capacities are, for example, 200 liters. The first chemical tank 21 stores a preset concentration, for example, 4% sodium hypochlorite aqueous solution, and the second chemical tank 22 stores a preset concentration, for example, 4% hydrochloric acid. Is done. Moreover, the produced | generated hypochlorous acid water is stored in the 3rd chemical | medical solution tank 23, and it can supply hypochlorous acid water to the plant etc. which are sterilization or disinfection from here. These first to third chemical liquid tanks 21 to 23 may be external tanks or built-in tanks.

  Further, the hypochlorous acid water generator 1 includes a first metering pump 31 and a second metering pump 32. These first and second metering pumps 31 and 32 are, for example, electromagnetically driven diaphragm metering pumps, and by displacing the diaphragm with a predetermined stroke, the pump chamber volume is increased or decreased, and a predetermined amount of liquid is intermittently supplied. Repeated discharge is possible.

  The first metering pump 31 has a suction port 31 a communicating with the first chemical liquid tank 21, and a discharge port 31 b communicating with a middle position of the first branch pipe 3. By driving the first metering pump 31, the sodium hypochlorite aqueous solution can be intermittently supplied (added) from the first chemical liquid tank 21 to the raw water flowing through the first branch pipe 3 by a predetermined amount.

The second metering pump 32 has a suction port 32 a communicating with the second chemical liquid tank 22, and a discharge port 32 b communicating with a middle position of the second branch pipe 4. By driving the second metering pump 32, hydrochloric acid can be intermittently supplied (added) from the second chemical liquid tank 22 to the raw water flowing through the second branch pipe 4 by a predetermined amount.

  In the first branch pipe 3, a first disk filter 41 is disposed between a portion communicating with the discharge port 31 b of the first metering pump 31 and the junction 5 at the downstream end thereof. The raw water after the sodium hypochlorite aqueous solution is supplied is stirred and mixed while flowing through the first disk filter 41, and becomes a uniform diluted aqueous solution and flows downstream. The dilution factor is, for example, 400 times (100 ppm) to 4000 times (10 ppm).

  In the middle of the second branch pipe 4, a second disk filter 42 is disposed between a portion communicating with the discharge port 32 b of the second metering pump 32 and the junction 5 at the downstream end thereof. . The raw water after the hydrochloric acid is supplied is stirred and mixed while flowing through the second disk filter 42, and becomes uniform diluted hydrochloric acid and flows downstream. The dilution factor is, for example, 400 times (100 ppm) to 4000 times (10 ppm).

  A diluted aqueous solution of sodium hypochlorite is supplied from the first branch pipe 3 to the downstream side pipe 6, and diluted hydrochloric acid is supplied from the second branch pipe 4. A third disk filter 43 is disposed in the downstream pipe line 6. The dilute aqueous solution of sodium hypochlorite and dilute hydrochloric acid are stirred and mixed while flowing through the third disk filter 43. Thereby, hypochlorous acid water having a predetermined pH value or a predetermined residual chlorine concentration is generated. The produced hypochlorous acid water is temporarily stored in the third chemical liquid tank 23 via the on-off valve 12, and is supplied from here to a plant to be spread. For example, the capacity of the first to third disk filters is 5 liters or more.

  A control panel 50 is disposed in the hypochlorous acid water generator 1. The control panel 50 controls the drive of each part. For example, in order to control the pH value and residual chlorine concentration of the generated hypochlorous acid water to be set values, the sodium hypochlorite aqueous solution by the first metering pump 31 is based on the measurement result by the flow meter 11. The supply amount of hydrochloric acid and the supply amount of hydrochloric acid by the second metering pump 32 are increased or decreased.

  In this example, the control panel 50 includes a pulse converter 51, and a pulse signal corresponding to the required amount of aqueous sodium hypochlorite solution based on the flow rate pulse representing the raw water flow rate measured by the flow meter 11. And a pulse signal corresponding to the amount of hydrochloric acid required. Based on these pulse signals, the first and second metering pumps 31 and 32 are pulse-driven. Specifically, the diaphragm is driven a number of times corresponding to the number of pulses, and a necessary amount of chemical solution is supplied to the first and second branch pipes 3 and 4.

  As described above, in the hypochlorous water generator 1 of this example, the raw water is branched into the first and second branch pipes 3 and 4. A predetermined amount of sodium hypochlorite aqueous solution is intermittently supplied to the raw water flowing through the first branch pipe 3 by a first metering pump 31, stirred and mixed through the first disk filter 41, and then A homogeneous diluted aqueous solution of sodium chlorite is obtained. In parallel with this, a predetermined amount of hydrochloric acid is intermittently supplied to the raw water flowing through the second branch pipe using the second metering pump 32, and the mixture is stirred and mixed uniformly through the second disk filter 42. Diluted hydrochloric acid is obtained. The obtained dilute aqueous solution of sodium hypochlorite and dilute hydrochloric acid are mixed and passed through the third disk filter 43 and stirred and mixed. Thereby, hypochlorous acid water having a predetermined concentration and pH is generated.

Primary chlorite water generator 2 Upstream line 3 First branch line 4 Second branch line 5 Junction point 6 Downstream line 7 Generator housing 8 Water supply pump 9 On-off valve 10 Pressure reducing valve 11 Flow rate Total 12 On-off valve 21 First chemical tank 22 Second chemical tank 23 Third chemical tank 31 First metering pump 31a Suction port 31b Discharge port 32 Second metering pump 32a Suction port 32b Discharge port 41 First disk filter 42 Second disk Filter 43 Third disk filter 50 Control panel 51 Pulse converter

Claims (4)

Forming a raw water stream supplied at a given pressure,
Branching the raw water stream into first and second branch streams;
Using a first metering pump, a predetermined concentration of sodium hypochlorite aqueous solution stored in the first chemical liquid tank is intermittently supplied to the first branch flow by a predetermined amount,
Stirring and mixing the first branched stream after the aqueous sodium hypochlorite solution is supplied to produce a uniform diluted aqueous stream of sodium hypochlorite;
The second branch flow is intermittently supplied with a predetermined amount of hydrochloric acid stored in the second chemical tank by a predetermined amount using a second metering pump,
Stirring and mixing the second branched stream after the hydrochloric acid is fed to produce a uniform diluted hydrochloric acid stream;
A dilute aqueous sodium hypochlorite stream and a dilute hydrochloric acid stream are combined and mixed by stirring to produce hypochlorous acid water having a predetermined concentration and pH,
Control the concentration and pH of the generated hypochlorous acid water, measure the flow rate of the supplied raw water, and supply the sodium hypochlorite aqueous solution and hydrochloric acid by the first and second metering pumps based on the measurement results A method for producing hypochlorous acid water, which is carried out by increasing or decreasing the amount of water. An upstream pipeline,
A first branch pipe and a second branch pipe branching from the downstream end of the upstream pipe and joining again;
A downstream pipe line extending from a confluence of the downstream ends of the first and second branch pipe lines;
A raw water supply pump for pumping raw water from the upstream pipeline to the downstream pipeline via each of the first and second branch pipelines;
A first chemical tank for storing a sodium hypochlorite aqueous solution having a preset concentration;
A second chemical tank for storing hydrochloric acid having a preset concentration;
A first metering pump that intermittently supplies a predetermined amount of sodium hypochlorite aqueous solution from the first chemical solution tank to the raw water flowing through the first branch pipe;
A second metering pump that intermittently supplies hydrochloric acid from the second chemical tank to the raw water flowing through the second branch pipe by a predetermined amount;
In the middle of the first branch pipe, a first stirring mixer that stirs and mixes raw water after the sodium hypochlorite aqueous solution is supplied;
In the middle of the second branch pipe, a second stirring mixer that stirs and mixes raw water after hydrochloric acid is supplied;
A third stirring mixer for stirring and mixing a diluted aqueous solution of sodium hypochlorite and diluted hydrochloric acid flowing through the downstream side pipe;
A hypochlorous acid water generator characterized by comprising: In claim 2,
The said 1st-3rd stirring mixer is a generator of hypochlorous acid water which is a disk filter. In claim 2 or 3,
A flow meter for measuring the flow rate of raw water flowing through the upstream pipeline,
Based on the measurement result by the flow meter, the amount of sodium hypochlorite aqueous solution supplied by the first metering pump and the amount of hydrochloric acid supplied by the second metering pump are increased or decreased, and obtained through the third stirring mixer. A control panel for controlling the concentration and pH of hypochlorous acid water,
A hypochlorous acid water generator.

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