JP4161071B2 - Water-based disinfectant manufacturing equipment - Google Patents

Description

The present invention relates to an aqueous disinfectant production equipment, in particular, it relates to an aqueous disinfectant production equipment for producing hypobromous acid disinfectant from ozone and bromide.

Bromine compound disinfectants are used for disinfecting various water systems such as sewage.
For example, Patent Document 1 discloses that hypobromite (hypobromite ion) is produced by a reaction of bromine ion and ozone in order to perform effective disinfection for a long period of time, which is insufficient with ozone. A biofouling suppression device that can be sterilized and sterilized by injecting into a pipe and adhering to the inner wall of the pipe is disclosed. In this Patent Document 1, it is described that hypobromite ions are stable and have a long life compared to ozone and have bactericidal power equivalent to hypochlorous acid.
In general, the reaction of generating hypobromite (HOBr) by blowing ozone (O ₃ ) into water containing bromine ions (Br ⁻ ) is considered as follows.
Br ⁻ + O ₃ = BrO ⁻ + O ₂
BrO ⁻ + H ⁺ = HOBr

Japanese Examined Patent Publication No. 62-11918

However, when hypobromous acid is generated as described above, the supplied ozone may react with BrO ⁻ to generate highly reactive bromic acid (BrO ₃ ⁻ ), but this bromic acid is generated as much as possible. It is preferable to obtain a hypobromite disinfectant without it. For that purpose, it is conceivable to transport the disinfectant itself to the place where the disinfectant is used, but it is not preferable to transport the high concentration hypochlorous acid itself. Moreover, it is inefficient to provide a complicated process so that bromic acid is not generated at the place of use.
The present invention is a water-based disinfectant mainly of hypobromous acid, and an object thereof is to provide a manufacturing equipment that can be manufactured with minimized to and efficient production of bromate.

  An apparatus for producing a water-based disinfectant according to the present invention is a water-based disinfectant manufacturing apparatus for producing a hypobromite disinfectant from ozone and bromide, a dissolver that dissolves the bromide to prepare a bromine ion solution, and the dissolver A bromine ion pH adjusting device for adjusting the pH of the bromine ion solution, an ozone generating device for generating ozone, and a solubilizer and the ozone generating device. And a disinfectant generation reservoir for generating and storing an acid.

  According to the present invention, since the pH of the bromide ion solution used as a raw material when producing a hypobromite disinfectant from ozone and bromide is adjusted to a predetermined range, the production of bromic acid is suppressed as much as possible and efficiently. Hypobromite disinfectants can be produced.

Embodiment 1 FIG.
FIG. 1 shows a disinfectant manufacturing apparatus 10 according to Embodiment 1 of the present invention. The disinfectant manufacturing apparatus 10 is combined with a sewage treatment mechanism 20. The disinfectant manufacturing apparatus 10 includes an ozone generator 11 and a dissolution tank 12 (corresponding to the dissolver of the present invention), and each is connected to a disinfectant production storage apparatus 16.

The ozone generator 11 is connected to an oxygen supply source (not shown) for supplying oxygen as a raw material for generating ozone to the ozone generator 11. The ozone generator may be any device as long as it can generate ozone using oxygen as a raw material.
The dissolution tank 12 is provided with a stirrer 13 and can contain a bromine ion agent and dissolved water. A transfer pump 14 for transferring the bromine ion solution in the dissolution tank 12 to the disinfectant generation storage device 16 is disposed between the dissolution tank 12 and the disinfectant generation storage device 16.

  The bromine ion agent usable here may be any solid bromide capable of generating bromine ions in water, and examples thereof include sodium bromide and potassium bromide. From the economical viewpoint, potassium bromide is preferred. Such bromide drug is mixed with dissolved water and dissolved to form a bromide solution. The concentration of the bromine ion solution at this time is appropriately determined according to the amount of ozone, but from the viewpoint of the production efficiency of the hypobromite disinfectant, the capacity of the disinfectant storage tank can be reduced as the concentration is increased. And since ozone absorption efficiency can be improved and economical efficiency can be improved, it is preferable to set it as 1 mass%-10 mass%.

The dissolution tank 12 is provided with a pH adjusting device 15 (corresponding to the bromine ion solution pH adjusting device of the present invention) for adjusting the pH of the bromine ion solution in the dissolution tank 12. The pH adjusting device 15 includes a detection unit that detects the pH of the bromine ion solution stored in the dissolution tank 12 and an administration unit that administers a pH adjusting agent.
The detection unit may be any pH measuring device as long as it can measure the pH of the bromine ion solution. The administration unit may be any drug administration device as long as it can administer a pH adjusting agent in a predetermined amount in order to adjust the pH of the bromine ion solution.
As a pH adjuster which can be used here, what can adjust pH of a bromine ion solution should just be mentioned, for example, hydrochloric acid and sulfuric acid can be mentioned.
The dissolution tank 12 is provided with a stirrer 13 for uniformly mixing the solution inside.

  The disinfectant production / storage device 16 can store the solution, and is provided with a not-shown inlet for introducing the bromine ion solution into the disinfectant production / storage device 16. In addition, an ozone outlet 17 is provided at the bottom of the disinfectant production and storage device 16 and is connected to the ozone generator 11. The ozone outlet 17 is configured by an ejection mechanism that ejects a predetermined amount of ozone so that the bromine ion solution stored in the disinfectant production storage device 16 and ozone come into contact with each other. Ozone is ejected from the ozone outlet 17 so that ozone and bromine ion solution are brought into contact with each other in the disinfectant production / storage device 16 to produce a hypobromite disinfectant. In addition, the supply amount of ozone should just be the quantity which can be contacted with a bromine ion solution and can produce | generate a hypobromite disinfectant here, and it is preferable that it is as high as possible from a viewpoint of production | generation efficiency.

  An injection device 18 for injecting the produced hypobromite disinfectant into the sewage treatment mechanism 20 is connected to the disinfectant production storage device 16. The injection device 18 is constituted by a distribution mechanism for injecting a predetermined amount of the disinfectant from the disinfectant production storage device 16 to the sewage treatment mechanism 20. Any distribution mechanism may be used as long as the disinfectant can be injected into the sewage treatment mechanism 20 at a predetermined amount and at a predetermined timing.

  The sewage treatment mechanism 20 is mainly for disinfection of the discharged water discharged from the pump station during the rain of the combined sewer system. The suction pipe 21 is provided with a rainwater pump 22 provided on the suction pipe 21. The injection device 18 of the disinfectant manufacturing apparatus 10 is connected to the suction pipe 21 of the sewage treatment mechanism 20 so that the disinfectant can be introduced into the suction pipe 21.

Next, the operation of the disinfectant manufacturing apparatus 10 according to this embodiment will be described.
When a bromine ion agent and dissolved water are introduced into the dissolution tank 12 while rotating the stirrer 13, a bromine ion solution is prepared in the dissolution tank 12.
At this time, in the bromine ion dissolution tank 12, the pH of the bromine ion solution is measured and adjusted by the pH adjusting device 15. The pH of the bromine ion solution adjusted here should just be acidic, Preferably it is 5 or less, More preferably, you may be 3.0 or less. Hypobromite (HBrO) maintains an equilibrium state depending on the pH. Therefore, if the pH is biased to the acidic side, the formation of hypobromite is promoted. It is considered that BrO ⁻ (bromate ion) is dissociated. Therefore, by setting the pH within the above range, the stability of hypobromite can be increased, and hypobromite can be efficiently produced while suppressing the production of bromate.

  Next, the transfer pump 14 is operated, and the bromine ion solution whose pH has been adjusted is put into the disinfectant production storage device 16. In the disinfectant production and storage device 16, when an appropriate amount of bromine ion solution is stored, ozone is blown from the ozone generator 11, and the ozone and bromine ion solution come into contact with each other. As a result, a hypobromite disinfectant is produced in the disinfectant production / storage device 16.

  The generated hypobromite disinfectant is injected from the disinfectant generation storage device 16 into the suction pipe 21 of the sewage treatment mechanism 20 by the operation of the injection device 18. Untreated sewage flows into the suction pipe 21 when it rains, and the sterilizing agent and the untreated sewage are strongly stirred by operating the rainwater pump 22. Thereby, a disinfectant and untreated sewage are mixed and sewage is disinfected.

  Therefore, when producing a hypobromite disinfectant from ozone and bromide, it is possible to produce a hypobromite disinfectant efficiently while suppressing the production of bromic acid as much as possible. As a result, it is possible to improve the sanitary measures for rivers, lakes, and seas by the discharged water discharged from the pumping station during rainfall.

Embodiment 2. FIG.
FIG. 2 shows a disinfectant manufacturing apparatus 30 according to Embodiment 2 of the present invention.
In this disinfectant manufacturing apparatus 30, a pH adjusting device 15 is connected to the bromine ion dissolution tank 12, while a disinfectant pH adjusting device 31 is connected to the disinfectant generating and storing device 16. For this reason, in addition to the pH of bromine ion dissolution, the pH of the produced disinfectant can also be detected and adjusted. Other configurations are the same as those in the first embodiment.

  The disinfectant pH adjusting device 31 used here is a detection unit that detects the pH of the disinfectant stored in the disinfectant generating and storing device 16, similarly to the pH adjusting device 15 that adjusts the pH of the bromine ion solution, And an administration unit that administers a pH adjusting agent for adjusting to a predetermined pH. Moreover, hydrochloric acid, a sulfuric acid, etc. can be mentioned to a pH adjuster used here similarly to the above.

In the disinfectant pH adjusting device 31, the pH of the disinfectant is adjusted to the acidic side, preferably pH 6 or less, more preferably 4 or less. Hypobromite is relatively stable, but has a characteristic that the decrease in the early stage of production is large, and the rate of reduction increases as the concentration of hypobromite produced increases. For this reason, since the density | concentration of the produced | generated hypobromite disinfectant reduces, it was necessary to improve from a viewpoint of manufacturing efficiency. On the other hand, in this invention, by adjusting pH to this range, decomposition | disassembly can be suppressed and reduction rate can be made small.
As a result, even when the disinfectant is stored for a long period of time, such as when there is no rain that requires disinfecting work, a decrease in concentration (performance decrease) due to decomposition of the disinfectant can be minimized.
Further, since the disinfectant is efficiently generated while the pH of the bromine ion solution is adjusted and the decomposition of the generated disinfectant is suppressed, raw materials such as ozone and bromine ion solution can be effectively used.

Embodiment 3 FIG.
FIG. 3 shows a disinfectant manufacturing apparatus 40 according to another embodiment of the present invention.
In this disinfectant manufacturing apparatus 40, the pH adjusting device 15 is connected to the bromine ion dissolution tank 12, and an ozone injection control device 41 corresponding to the ozone injection control means in the present invention is connected to the ozone generator 11. Other configurations are the same as those in the first embodiment.

  The ozone injection control device 41 calculates the amount of ozone consumed in the disinfectant production and storage device 16, and an instruction for instructing driving of the ozone generator 11 according to the amount of consumed ozone obtained by the calculation unit. It consists of parts. The adjustment of the ozone injection is performed by calculating the ozone consumption amount in the disinfectant generation / storage device 16 as a predicted value and switching the drive instruction of the ozone generator 11 at predetermined time intervals based on the predicted value.

  Since the hypobromite disinfectant becomes unstable in the early stage of production, it will decompose and decrease in concentration if stored in the disinfectant production storage device 16 for a long time, but bromine ions remain, so ozone The hypobromite disinfectant can be regenerated in the disinfectant production / storage device 16 by ozone instructed to be injected by the injection control device 41.

  Thus, in addition to being able to efficiently produce a disinfectant while adjusting the pH of the bromine ion solution, even if the hypobromite disinfectant in the disinfectant production and storage device 16 is decomposed, ozone is produced and stored. Since it can be appropriately injected into the device 16, the disinfectant can be regenerated in the disinfectant production storage device 16. As a result, even when a predetermined amount of disinfectant is stored for a long period of time, a disinfectant having a constant activity can be always stored, and a highly reliable disinfectant can be manufactured for a long period of time.

  In this disinfectant manufacturing apparatus 40, the ozone injection control device 41 predicted the amount of ozone consumed. However, the ozone injection control device 41 measures the amount of ozone consumed in the disinfectant production and storage device 16 and according to this consumption amount. The driving of 41 may be instructed. The ozone consumption amount can be easily calculated from the supply amount, the ozone amount in the exhaust gas, and the dissolved ozone amount.

  Further, the disinfectant manufacturing apparatus 40 may further include the disinfectant pH adjusting apparatus 31 described in the second embodiment. Thereby, the disinfectant which has fixed activity can be provided much more stably.

  Although the disinfectant manufacturing apparatuses 10, 30, and 40 according to the embodiments of the present invention are used in combination with a sewage treatment mechanism, they may be used by being incorporated in a system that requires another water-based disinfectant. For example, drainage systems such as power plants and chemical factories can be mentioned. Changes according to the system to be combined can be easily made by those skilled in the art.

Examples of the present invention will be described below.
Example 1
1 L of a 100 mgBr / L sodium bromide (NaBr) solution was charged as raw water into a 1.3 L reactor having a diffuser tube at the bottom, and ozone gas was supplied from the diffuser tube. The concentration of the supplied ozone gas was 60 g / Nm ³ and the flow rate was 0.2 L / min.
At this time, the initial pH in the reactor was set to 6.9, 4.9 and 3.0, and hypobromite in the reactor after 1 minute, 3 minutes, 5 minutes, 10 minutes and 30 minutes. Concentration was measured. In addition, the iodometry method was used for the measurement of hypobromous acid. The results are shown in Table 1.

As shown in Table 1, when the pH was adjusted to an acidic pH (pH 4.9 and pH 3.0) rather than the neutral pH (pH 6.9), the hypobromite disinfectant It was clear that the amount produced was significantly increased.
Therefore, when producing the hypobromite disinfectant, the hypobromite disinfectant can be efficiently produced by adjusting the pH to the acidic side.

Example 2
Next, the hypobromite disinfectant produced in Example 1 is allowed to stand under various pH environments, and the concentration of the hypobromite disinfectant is measured after 20 minutes, 70 minutes and 1000 minutes. Then, the degree of decomposition of the hypobromite disinfectant was examined. The results are shown in Table 2.

As shown in Table 2, in the case of pH on the acidic side (pH 5.7 and pH 3.4), the amount of decrease in hypobromite is small, especially in the case of pH 3.4, almost even after 1000 minutes have passed. It did not decrease. On the other hand, in the case of neutral pH (pH 7.0), it was already reduced to less than half after 20 minutes, and it was clearly unsuitable for maintaining a hypobromite disinfectant. It was.
Therefore, by maintaining the hypobromite disinfectant at an acidic pH, the hypobromite disinfectant can be maintained over a long period of time, and a highly reliable hypobromite disinfectant can be produced. it can.

It is a schematic block diagram of the disinfectant manufacturing apparatus which concerns on embodiment of this invention. It is a schematic block diagram of the disinfectant manufacturing apparatus which concerns on other embodiment of this invention. It is a schematic block diagram of the disinfectant manufacturing apparatus which concerns on other embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 Disinfectant manufacturing apparatus, 11 Ozone generator, 12 Dissolution tank, 15 pH adjuster (bromine ion solution pH adjuster), 16 Disinfectant production storage device, 20 Sewage treatment mechanism, 31 Disinfectant pH adjuster, 41 Ozone injection Control device (ozone injection control means).

Claims (5)

In a water-based disinfectant manufacturing apparatus that manufactures a hypobromite disinfectant from ozone and bromide,
A dissolver for dissolving the bromide to prepare a bromine ion solution;
A bromine ion solution pH adjusting device connected to the dissolver and adjusting the pH of the bromine ion solution to a predetermined range;
An ozone generator for generating ozone;
A disinfectant generator and reservoir connected to the dissolver and the ozone generator for generating and storing hypobromite from a bromine ion solution and ozone;
A water-based disinfectant manufacturing apparatus comprising: The water-based disinfectant production apparatus according to claim 1, further comprising a disinfectant pH adjusting device connected to the disinfectant generating reservoir for adjusting the pH of the generated hypobromite disinfectant. An injection control means connected to the ozone generator and further comprising an injection control means for adjusting the amount of ozone injected into the disinfectant production reservoir according to the amount of ozone consumed in the disinfectant production reservoir. The water-based disinfectant manufacturing apparatus according to claim 1 or 2.   The water-based disinfectant manufacturing apparatus according to any one of claims 1 to 3, wherein the bromine ion solution pH adjusting device adjusts the pH of the bromine ion solution to 5 or less.   5. The water-based disinfectant manufacturing apparatus according to claim 2, wherein the disinfectant pH adjuster adjusts the pH of the hypobromite disinfectant to 6 or less.

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