JP2001314851A - Water circulating and sterilizing apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the sterilizing/cleaning effect of pool water or the like while removing trihalomethane. SOLUTION: A pool seawater circulating and sterilizing apparatus has an overflow water circulating system and a bottom water circulating system equipped with filters 5, 13, an ozone generator 6, a chlorine sterilization device 11 or the like and the overflow water circulating system is provided with an overflow tank 2 receiving pool water, an aeration blower 3 and an air diffusion nozzle 21. Ozone or chlorine and seawater react to form an oxidant in seawater and this oxidant is carried in a pool to more perfectly sterilize and clean pool water. The oxidant and organic matter are reacted in the pool to form trihalomethane in pool water but this water is introduced into the overflow tank 2 and air is blown in the overflow tank from the air diffusion nozzle 21 to remove trihalomethane accompanied by air.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water circulation sterilizer for circulating a bromide-containing water in a water storage section in which a bromide-containing water is stored and injecting a bactericide into the water, and more particularly to circulating seawater using ozone. It is conveniently used for sterilizing and purifying equipment.

[0002]

2. Description of the Related Art For example, in a water circulation sterilizer for a seawater pool, while circulating and filtering the seawater in the pool, chlorine is injected into the pool to sterilize the water, or ozone generated by an ozone generator is injected to achieve a higher level. I try to sterilize and purify. However, according to such a device, the injected chlorine and ozone react with bromine ions present in trace amounts in seawater,
First, bromo peroxide such as bromic acid is generated, and then the bromo peroxide reacts with a small amount of organic substances also present in seawater to form bromoform. This bromoform is a kind of trihalomethane, and it is desired to remove it. However, conventionally, there is no known device for removing trihalomethane particularly in such a pool seawater circulation sterilization device or the like.

[0003] As a technique for removing oxidants such as bromoperoxide, there is known an apparatus for decomposing oxidants with activated carbon or removing the oxidants in an aeration tank (Japanese Patent Application Laid-Open No. 9-1997).
299935 and JP-B 5-46277).

[0004]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a water circulating sterilizer capable of improving the germicidal effect and removing generated trihalomethane when sterilizing bromo-containing water such as seawater.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a water circulating sterilizer for circulating the bromide-containing water in a water storage section in which the bromide-containing water is stored and injecting a germicide into the circulating water. And an aeration means for storing and aerating the bromide-containing water circulated before injecting the disinfectant.

[0006]

FIG. 1 shows an example of the overall structure of a water circulation sterilizer to which the present invention is applied. The water circulation disinfection apparatus of this embodiment circulates the seawater of the pool 1 which is a reservoir storing seawater which is bromide-containing water, and injects ozone and chlorine as a disinfectant in this embodiment in the pool water circulation disinfection purification. The apparatus has an overflow tank 2 and a blower 3 as aeration means for collecting and aerating seawater circulated before injecting a germicide.

As a seawater circulation system, an overflow water circulation system, an overflow tank 2 for introducing overflow water discharged from a gutter 1a of a pool 1, a first circulation pump 4, a first filter 5, and an ozone water inlet at its inlet. Generator 6, water supply pump 7, water ejector 8, ozone reaction tower 9 with waste ozone treatment device 9a for supplying water, heat exchanger 10 for circulating seawater heating, injection pump 11a
And the like are provided. or,
A bottom water circulation system is provided, which also serves as the above-mentioned ozone generator and chlorine injection device, and is additionally provided with a second circulation pump 12 and a second filter 13.

The overflow tank 2 has, for example, a width 2
m, a length of about 3 m, and a height of about 1.5 m, and a diffusion nozzle 21 for ejecting air supplied from the blower 3 from a number of small holes is provided at the bottom thereof. The supplied air is exhausted from the upper exhaust port 22. The overflow tank 2 has a function as a buffer tank, and usually has a water depth of about 0.8 m. Reference numeral 23 denotes a seawater supply line. Note that make-up water may be automatically injected depending on the water depth.

The ozone generator 6 of this embodiment is of an electrolytic type using a solid polymer electrolyte membrane, and generates a high-concentration ozone gas of about 180 g / m ³ . The amount of ozone gas generated is adjusted by the controller 6a. As the first and second filters 5 and 13, ordinary sand filters can be used. The heat exchanger 10 is a device that heats the circulating seawater into hot seawater, and is heated by hot water at a temperature of about 80 ° C. created by a water heater (not shown).

[0010] The above-mentioned pool water circulation sterilizing and purifying apparatus is operated as follows and exhibits its function. The overflow water circulation system is usually operated continuously. At this time, the first circulation pump 4 is operated to take in seawater from the surface of the pool 1 through the overflow tank 2, flow the seawater into the first filter 5, and return the pool 1 to the pool 1 through the heat exchanger 10. Filter by circulation. The ozone generator 6 is operated to generate ozone gas, which is sucked and mixed into seawater by a water ejector 8 in which a part of the circulating seawater is branched and flown by a water supply pump 7, and the ozone gas is generated by an ozone reaction tower 9. To dissolve ozone in seawater and to react most of the ozone with bromine ions in seawater to produce bromoperoxide consisting of oxidic acid, such as bromic acid,
The oxidant-containing ozone water is introduced into the filter 5.
Further, following the operation of the ozone generator 6, the blower 3 for aeration is operated.

According to the oxidant-containing ozone water as described above, a strong sterilizing, decoloring and deodorizing effect of the oxidant can be obtained, and the circulating water is formed during the reaction in the reaction tower and by the aggregating action of the ozone water in the filter 5. The pool water can be made into clear and highly transparent seawater through the turbidity. The oxidant reacts with the dirt component of the circulating filtered water and is largely decomposed in the filter, but is supplied with ozone so as to remain after passing through the filter. As a result, the residual oxidant is introduced into the pool 1 and further performs a sterilizing and purifying action therein, so that a great effect can be obtained in maintaining the cleanliness of the pool water.

On the other hand, since the oxidant concentration in the pool 1 desirably does not exceed, for example, about 1 ppm, the ozone generation amount is adjusted by the output control section 6a of the ozone generator 6. In this case, an oxidant detector such as a bromic acid monitor may be provided in the system on the circulating water inlet side of the pool 1 to automatically adjust the amount of ozone generated. Particularly, it is desirable to do so in a fish breeding aquarium such as an aquarium.

As described above, the oxidant effectively acts on seawater even in the pool 1, but when seawater containing the oxidant stays in the pool for a long time, the oxidant reacts with a trace amount of organic matter present in the pool water, and In 10 minutes to several hours, trihalomethane such as bromoform is produced.

The seawater containing trihalomethane is introduced into the overflow tank 2 and stays there for a certain period of time.
Aerated by the numerous air bubbles formed by the As a result, most of the trihalomethane in the seawater is accompanied and removed by the bubbles, and is discharged from the exhaust port 22 together with the bubbles. Since the seawater from which the trihalomethane has been continuously removed is circulated and supplied into the pool 1, the concentration of the trihalomethane in the pool 1 can be greatly reduced to a level that does not affect the human body at all.

Although the operation of the overflow water circulation system and the operation and effect thereof have been described above, the bottom water circulation system is also operated at night or at regular time intervals, thereby producing the same operation and effect. That is, in the operation of this system, the ozone generated by the ozone generator 6 is introduced into the second filter 13 through the ozone reaction tower 9 to sterilize and purify seawater under the action of ozone and oxidants. Can be. Further, the residual oxidant is also supplied to the pool 1 by this bottom water circulation system, and the pool water is further sterilized and purified. On the other hand, the trihalomethane generated thereby is removed by the aeration system.

The chlorine injection device 11 is also operated as required, and this chlorine also generates an oxidant, which has a disinfecting and purifying action and generates trihalomethane, which is also eliminated by the aeration system of the overflow water circulation system. The heat exchanger 10 is operated constantly or intermittently to maintain the seawater in the pool 1 in an appropriate temperature range.

The inventors of the present invention have conducted experiments using the apparatus of the present invention as described above, including an embodiment using the aeration system by operating the blower 3 to exert its function and a comparative example in which the operation of the blower is stopped. The following results were obtained: [Operating equipment and common operating conditions] Size of pool (width x length x water depth); 25 m x 12 m x 1.1 m Overflow tank dimensions; 4 m x 3 m x 1.5 m × 0.8 m (width × length × height × water level) Blower capacity: 4 m ³ / min Ozone generator Ozone concentration: 180 g / m ³ Ozone generation amount: 24 g / h Filtration capacity of first and second filters; 60 m ³ / h (circulation pump capacity) Filter used; first filter 5 [Example and Comparative Example] When the blower was operated and the aeration system was operated as [Example], and the blower was stopped as [Comparative Example]. Aeration The measurement results of the concentration (ppm) of trihalomethane in the pool water when the stem was disabled were as follows: Trihalomethane type [Comparative Example] [Example] Bromoform; 0.4 0.03 Dibromochloromethane; 0 0.06 0.001 Dichlorobromomethane; 0.03 0.001 Total trihalomethane; 0.49 0.032 (about 1/15 of the comparative example) As described above, the pool was found to contain 0.49 ppm of total trihalomethane. By implementing the present invention,
The value was set to 0.032 ppm, which could be reduced to about 1/15.

Although an example in which the present invention is applied to a seawater pool has been described above, the present invention is not limited to this, and it is possible to reduce trihalomethane while utilizing the bactericidal effect of an oxidant such as a seawater aquarium or a hot spring containing bromide. Widely used in water circulation sterilization equipment that needs to be operated.

[0019]

As described above, according to the present invention, in a water circulating sterilization facility for circulating bromide-containing water and the like stored in a water storage section and injecting a germicide into the circulating water, the circulating water is circulated before the germicide is injected. Since the aeration means for storing and aerating the bromide-containing water is provided, the sterilizing / purifying effect of the water in the water storage section can be enhanced while the content of trihalomethane in the water storage section is significantly reduced.

That is, for example, in bromide-containing water containing bromide ions such as seawater, when germicidal agents such as ozone and chlorine are circulated and used alone or collectively, the germicides and the bromine ions in the water are mixed. Oxidant is produced by reaction, but by leaving a part of it to the reservoir,
Good sterilization and purification effects can be obtained.

On the other hand, if the oxidant is present in the storage part having a long residence time, it reacts with the organic matter in the water to generate trihalomethane. However, such water is stored and aerated by aeration means. The trihalomethane can be removed together, and the trihalomethane content of water in the reservoir can be significantly reduced. In this case, since the circulating water is aerated before the germicide is injected, the oxidant is sufficiently sterilized with respect to the circulating water and the water in the reservoir until the germicide is injected into the circulating water and the circulating water exits the reservoir. It can give a purifying effect.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an example of the overall structure of a water circulation sterilization facility to which the present invention has been applied.

[Explanation of symbols]

 Reference Signs List 1 pool (reservoir) 2 overflow tank (aeration means) 3 blower (aeration means) 21 diffuser nozzle (aeration means)

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C02F 1/50 540 C02F 1/50 540B 550 550D 560 560Z 1/76 1/76 A 1/78 1/78

Claims (1)

[Claims] 1. A water circulation sterilizer for circulating the bromide-containing water in a water storage section in which the bromide-containing water is stored and injecting a bactericide into the water, wherein the bromide-containing water circulated before the bactericide is injected. A water circulation sterilizer comprising an aeration means for storing and aerating water.