JPH07136405A - Trihalomethane removal device - Google Patents

Abstract

(57) [Summary] [Object] The present invention provides a trihalomethane or the like which can halve a carcinogenic substance such as trihalomethane contained in tap water or the like with a simple structure, and which can suppress the growth of bacteria. The purpose is to provide a removal device. [Structure] A device for removing trihalomethane or the like according to the present invention comprises a spray nozzle 2 and a rectifying pipe 3 provided on the outer periphery of the spray nozzle 2.
Then, the technical means of providing the air intake port 5 between the spray nozzle and the straightening pipe is taken. The removing device of the present invention is preferably composed of a synthetic resin containing a silver antibacterial agent added in an amount of 1.0 to 5.0 wt%. The device for removing trihalomethane or the like according to the present invention is suitably installed in the discharge pipe 1 of the water purifier.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing trihalomethanes and the like in tap water, which is capable of suppressing the growth of bacteria, and particularly used for water purifiers and the like.

[0002]

2. Description of the Related Art Tap water in Japan is supplied to each local government by using rivers and groundwater as water sources. At each water purification plant operated by each local government, various chemicals are added to the water sent from the water sources such as rivers and groundwater to process it. It is supplied to each household as tap water. However, while there was no problem with this system as long as the water quality of the water source was good, the following problems have arisen because the water quality of these rivers and groundwater has deteriorated in recent years.
In order to process a large amount of poor quality water in a short time,
Most water treatment plants have adopted the method of adding a large amount of chlorine at the final stage of treatment, and the addition of this chlorine has led to complaints about tap water being not good and smelling of chlorine. It was. And many residents have taken self-defense measures such as purchasing water purifiers to purify tap water. Recently, water purifiers have become popular in a large number of households in the suburbs of large cities. The demand for water purifiers tends to increase further. By the way, the water purifier was first put on the market for more than 10 years, but initially it was mainly activated carbon to remove the odor of chlorine. However, since the above-mentioned deterioration of water quality is reflected in water purifiers and it meets the needs of modern people who are sensitive to hygiene, recent water purifiers are hollow fiber membranes that can remove fine dust and bacteria in addition to the odor of chlorine. The combination of is becoming mainstream.

As described above, the odor of chlorine, fine dust, or bacteria can be removed to some extent by a water purifier, but recently, the following facts have been discovered and have become a problem. That is, carcinogens such as trihalomethanes were detected in tap water, probably because organic substances such as humic substances that could not be treated in the water treatment plant react with chlorine. Here, trihalomethane or the like means a low-boiling organic halogen compound, and both are carcinogenic and volatile. In this specification,
Of these, trihalomethane is the most problematic one, so this low boiling point organic halogen is referred to as trihalomethane or the like. Carcinogens such as trihalomethane cannot be completely removed even by the water purifier using the recent hollow fiber membrane. This is because carcinogenic substances such as trihalomethane are adsorbed while the activated carbon in the water purifier is active, but this activity is shown only for a while while the activated carbon is new, and adsorption by activated carbon This is because the saturated amount is reached immediately after using the vessel. Hollow fiber membranes also contribute little to the removal of this material. Therefore, even if it is possible to partially remove trihalomethane and the like with a water purifier using a hollow fiber membrane, it can only be removed only at the initial stage of use. And unfortunately, trihalomethane etc. adsorbed on the activated carbon is easily released from the activated carbon, so that trihalomethane etc. is detected from the water in the water purifier at a concentration higher than the concentration of trihalomethane etc. detected in tap water. Sometimes it happens.

Therefore, various measures have been considered in order to remove carcinogenic substances such as trihalomethane. There are two main methods: an adsorption removal method using activated carbon and an atmospheric dispersion method using aeration or boiling. The adsorption removal method using activated carbon is
The purpose of the present invention is to compensate for the above-mentioned drawbacks of activated carbon and to remove trihalomethane and the like while regenerating saturated activated carbon. It is suitable for treating large amounts of water. Further, in the atmospheric dispersion method by aeration, the treated water is aerated to disperse and remove trihalomethane and the like in the water. This method is characterized in that the device is simple and maintenance-free. Then, the atmospheric dispersion method by boiling completely removes trihalomethane and the like in water by boiling water.

[0005]

However, these conventional examples have the following problems. In other words, adsorption removal with activated carbon is suitable for use in large-scale treatment facilities where activated carbon can be easily regenerated, for example, in water purification plants, but in small water purifiers, the amount of activated carbon is small. It is practically difficult to remove trihalomethane etc. only by this method, because the amount is saturated immediately. Although the atmospheric dispersion method by aeration has a simple apparatus, it has a problem that it takes a long time to remove trihalomethane and the like because its ability to remove trihalomethane is correlated with the contact time with air. Further, the atmospheric dispersion method by boiling is very problematic in that it is troublesome and too expensive due to boiling.

In addition to this, there is a new problem that bacteria accumulate in accumulated water in water purifiers and the like. That is, the bleaching water is removed by the activated carbon and the purified water stays in the vicinity of the discharge port of the water purifier, but bacteria are more likely to propagate because the sterilizing power is reduced. Therefore, the environment is such that bacteria, including fungi such as mold, can easily reproduce.

The present invention solves these problems, and can halve carcinogenic substances such as trihalomethane contained in tap water and the like with a simple structure, and can suppress the growth of bacteria. It is an object of the present invention to provide a device for removing trihalomethane and the like.

[0008]

A device for removing trihalomethane or the like according to the present invention is provided with a spray nozzle, a rectifying pipe provided on the outer periphery of the spray nozzle, and an air intake port between the spray nozzle and the rectifying pipe. Taking technical measures.

The removing device of the present invention is preferably composed of a synthetic resin containing 1.0 to 5.0 wt% of a silver-based antibacterial agent.

The device for removing trihalomethane or the like according to the present invention is suitably installed in the discharge pipe of a water purifier.

[0011]

The device for removing trihalomethanes and the like according to the present invention is provided with a spray nozzle, a rectifying pipe provided on the outer periphery of the spray nozzle, and an air intake port between the spray nozzle and the rectifying pipe. It is possible to suck the air from the air intake by the generated water. The sucked air is thoroughly mixed with the jet in the straightening tube. The atomized jet is agitated by the turbulent shear stress between the sucked air and the contact area between water and air is dramatically increased, so that trihalomethane etc. can be dispersed in the atmosphere. it can.

The device for removing trihalomethane or the like according to the present invention is provided with the spray nozzle and the flow straightening pipe provided on the outer periphery of the spray nozzle, so that the sprayed water can be prevented from scattering over a wide range. .

Further, since the device for removing trihalomethane or the like of the present invention is made of a synthetic resin containing 1.0 to 5.0% by weight of a silver-based antibacterial agent, it is suitable for reducing calcination and propagating bacteria. Even if stagnant water is left in the environment, it is possible to suppress the growth of bacteria here.

Since the device for removing trihalomethane or the like of the present invention is provided at the outlet of the water purifier, it is possible to effectively remove trihalomethane or the like from the water purifier.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 (a) is a sectional view taken along line II-II of an embodiment of a device for removing trihalomethane or the like according to the present invention,
FIG. 1B is a sectional view taken along the line I-I of the embodiment of the removing apparatus for trihalomethane or the like according to the present invention. FIG. 2 is an overall explanatory view of an embodiment in which the device for removing trihalomethane or the like according to the present invention is used in a water purifier.

In FIGS. 1A and 1B, reference numeral 1 is a discharge pipe. The discharge pipe 1 is made of stainless steel and has an AB tip.
The spray nozzle 2 made of S resin is connected. The nozzle thin tube of the spray nozzle 2 has an inner diameter of about ⅕ as compared with the discharge pipe 1 side, and is made to project from the spray nozzle 2 main body while greatly reducing the inner area. Reference numeral 3 is a flow straightening tube that covers the outer circumference of the spray nozzle 2. The straightening pipe 3 extends in the ejection direction from the projected thin nozzle pipe with a length equal to or longer than the length of the spray nozzle 2. Two connecting members 4 that support the rectifying tube 3 and connect the rectifying tube 3 to the spray nozzle 2 are provided between the rectifying tube 3 and the spray nozzle 2. Reference numeral 5 is an air intake formed between the discharge pipe 1 and the rectifying pipe 3. 6
Is an outlet. A guide having a low height for guiding the fluid may be provided inside the rectifying tube 3. Further, this guide can be formed in a spiral shape so that the connector 4 can be rotated around the outer circumference of the spray nozzle 2. In this case, the jetted water and air can be smoothly discharged. Both the flow straightening tube 3 and the connecting tool 4 are molded of ABS resin like the spray nozzle 2. In addition, resins such as hard vinyl chloride, soft vinyl chloride, polyethylene, polypropylene, and VA resin may be used. In this embodiment, in order to prevent the growth of bacteria, 1.0 to 5.0 wt% of a silver-based antibacterial agent is added to the spray nozzle 2, rectifying tube 3 and connecting tool 4 made of these resins. There is. By the way, the device 11 for removing trihalomethanes and the like of this embodiment is provided in the water purifier shown in FIG.
In FIG. 2, 7 is a water purifier body. Reference numeral 8 is a tap water inlet for flowing tap water into the water purifier body 7. Activated carbon 9 is disposed below the water purifier body 7. The activated carbon 9 is granular activated carbon having a particle size of about 1 mm to 2 mm, and mainly removes foreign matters and scaly powder. A hollow fiber membrane 10 is provided above the activated carbon 9. The hollow fiber membrane 10 is made of a polysulfone-based material. By this, bacteria etc. can be separated. A part of the powdered activated carbon is separately enclosed between the activated carbon 9 and the hollow fiber membrane 10. This powdered activated carbon has a particle size of 50 μ to 1
It is about 0μ and is for removing the musty odor and odor in the water purifier. A discharge pipe 1 is provided above the water purifier main body 7 and is connected to a removing device 11 for removing trihalomethane or the like.

The operation of this water purifier and the device 11 for removing trihalomethanes will be described. The tap water introduced from the tap water inlet 8 enters the inside of the water purifier main body 7 and the activated carbon 9 removes chlorine and a part of trihalomethane. Then, the odor is also removed by the powdered activated carbon and introduced into the hollow fiber membrane 10. After the bacteria and the like are removed by the hollow fiber membrane 10, the purified water is sent to the removing device 11 for the trihalomethane and the like through the discharge pipe 1. The purified water that has entered the removal device 11 for removing trihalomethane or the like is atomized by the spray nozzle 2 and ejected from the nozzle thin tube at the tip. The purified water ejected in the form of mist drags the air in the rectifying pipe 3 to cause a flow. The turbulent shear stress between the jetted purified water and the air becomes a driving force for causing the agitation between the air and the purified water, and increases the contact area between the two. Trihalomethane and the like have extremely high volatility, and increasing the contact area promotes dispersion of trihalomethane and the like in the atmosphere. Further, in this embodiment, since the air intake port 5 is provided in the straightening pipe 3, the air is constantly supplied from the air intake port 5. It is, so to speak, an ejector action. The supplied air is sufficiently mixed in a short distance due to the presence of the rectifying pipe 3, and the rectifying pipe 3 has a uniform flow velocity.
Will be discharged from. If the flow straightening pipe 3 and the air intake port 5 are not provided, the stirring action is not sufficient and the mixing is not promoted so much. However, by providing the flow straightening pipe 3, the mixing is dramatically promoted, and the contact area between the air and the purified water is increased. Is further increased, and volatilization of trihalomethane etc. is greatly promoted.

Table 1 is a measurement of how the rectifying tube 3 contributes to the removal of trihalomethane. Rectifier tube 3
It is a measurement of the trihalomethane concentration in the water in the case where the above is not provided, and in the case where the length of the straightening tube 3 and the area of the air intake port 5 are variously changed. The flow rate is 3.0
It was performed by a simultaneous analysis method by gas chromatography-mass spectrometry under the conditions of 1 / min, a water temperature of 18 degrees, and a trihalomethane concentration of 83.1 ppb before being introduced into the spray nozzle 2. The value in parentheses indicates the removal rate.

[0019]

[Table 1]

According to Table 1, when the air intake port 5 is not provided, the removal rate is higher in the case without the flow straightening tube 3 than in the case with the flow straightening tube 3. In this case, rectifying tube 3
The removal rate decreases as the length of the film increases. On the other hand, when the air intake port 5 is provided, the removal rate tends to increase as the length of the rectifying tube 3 increases.
However, the influence of the size of the air intake port 5 is not so noticeable except when it is extremely large or small. It can be seen from Table 1 that the mixing of the sprayed water and air is greatly promoted by providing the rectifying tube 3 and the removal rate is increased. Also, increasing the length to some extent tends to increase the removal rate of trihalomethane.

Next, Table 2 shows the case where purified water is simply discharged from the discharge pipe 1, the case where the spray nozzle 2 is provided in the discharge pipe 1,
The amount of splashed water was measured in three cases in the case of this embodiment in which the straightening tube 3 having a length of 5 cm and the air intake port 5 having an area of 0.25 cm ² were provided in the spray nozzle 2. In the experiment, water was allowed to flow for 1 minute at a flow rate of 3.0 l / min and a water temperature of 18 degrees, and the amount of splash was measured 20 cm below the discharge pipe.

[0022]

[Table 2]

From Table 2, it can be seen that this embodiment is less likely to scatter than when the spray nozzle 2 is simply provided.

By the way, in this embodiment, the spray nozzle 2, the rectifying tube 3 and the connecting tool 4 are made of ABS resin, and 1.0 to 5.0 wt% of silver antibacterial agent is added. This is because the purified water from which the chlorine and the like have been removed by the water purifier is sent to the trihalomethane etc. removing device 11, so that the water staying here has poor bactericidal power, and bacteria easily proliferate. It is necessary. However, even if an antibacterial agent is used, this embodiment is for drinking water, so that it is necessary to select one having a small effect on the human body. Therefore, it is difficult to use organic antibacterial agents such as licorice extract, allyl isothiocyanate and cinnamon oil. Further, even if it is an inorganic antibacterial agent, it is necessary to select a nontoxic one, so that zinc type, tin type, mercury type, etc. cannot be used, and the silver type antibacterial agent is most desirable. However, some silver-based antibacterial agents have silver complex salts supported on silica gel or glass.This is because chloride ions contained in tap water react with silver complex salts to form silver chloride, which is oxidized. Since it becomes silver oxide and becomes passive and gradually loses its antibacterial action, a thiosulfotosilver complex salt that does not react with chloride ions is the most desirable. The silver-based antibacterial agent of this embodiment is supported on silica gel and the surface thereof is covered with a hydroxide of tetraethoxysilane. This is a coating for which the antibacterial agent gradually dissolves and the release action and the service life are extended. With respect to this coating, a similar action can be expected even with a tetraloxysilane hydroxide such as tetramethoxysilane. By adding a silver-based antibacterial agent in this way, even if the discharged purified water bounces or the bacteria come into the accumulated water due to contact with the hand, the growth of the bacteria can be suppressed. .

Table 3 shows the antibacterial action when the ratio of the antibacterial agent added to the resin is increased. The resin was measured by ABS resin, hard PVC, soft PVC, polyethylene, polypropylene, VA resin and the like. The measurement is carried out by dropping a bacterial solution with a known bacterial count on a resin processed into a sheet, keeping it at 37 degrees for 18 hours, and then measuring the bacterial count in the bacterial solution and comparing it with the initial bacterial count. went. The higher the reduction rate of the number of bacteria, the higher the antibacterial effect. "Great effect" shown in Table 3 indicates a decrease in the number of bacteria of 80 to 100 wt%, "Effective" indicates a decrease of the number of bacteria of 60 to 80 wt%, and "No effect" indicates a decrease of the number of bacteria of 60 wt%. It shows the following:

[0026]

[Table 3]

According to this, it can be seen that the antibacterial agent addition ratio to these resins is 1.0% by weight or more and exhibits an antibacterial effect. However, if the antibacterial agent addition ratio exceeds 5.0 wt%,
Both resins have a markedly reduced strength and are difficult to process.
At the same time, the material becomes colored and the surface becomes a very rough composition state. Therefore, the antibacterial agent cannot be added with the antibacterial agent addition ratio exceeding 5.0 wt%. After all, the antibacterial agent addition ratio of the silver-based antibacterial agent is in the range of 1.0 to 5.0 wt%, which is an effective range for achieving the intended purpose.

Further, Table 4 shows a case where purified water is retained in the removing device 11 for removing trihalomethane or the like of this embodiment in which a silver-based antibacterial agent is added to the resin and a case where the antibacterial agent is not added in the spray nozzle 2. It is the result of measuring how the numbers of bacteria differ when the purified water is retained for a long time.

[0029]

[Table 4]

According to this, it can be seen that in this embodiment, even if the purified water is left for a long time, the growth of bacteria is suppressed.

As can be seen from the above, the present embodiment can remove trihalomethane and the like from the water purifier, and even if the purified water stays, bacteria do not propagate and the conventional water purifier is used. It is possible to greatly reduce the drawbacks of.

[0032]

The device for removing trihalomethanes and the like according to the present invention is provided with a spray nozzle, a rectifying pipe provided on the outer circumference of the spray nozzle, and an air intake port provided between the spray nozzle and the rectifying pipe. The contact area between water and air can be dramatically increased, and trihalomethane or the like can be volatilized and dispersed in the atmosphere to halve trihalomethane or the like in water.

Since the device for removing trihalomethane or the like of the present invention is provided with the spray nozzle and the flow straightening pipe provided on the outer periphery of the spray nozzle, it is possible to prevent the jetted water from scattering over a wide range. .

Further, the removing apparatus for trihalomethanes and the like of the present invention is composed of a synthetic resin containing 1.0 to 5.0% by weight of a silver-based antibacterial agent, so that it is suitable for reducing calcination and propagating bacteria. Even if stagnant water is left in the environment, it is possible to suppress the growth of bacteria here.

Since the device for removing trihalomethane or the like of the present invention is provided at the outlet of the water purifier, it is possible to effectively remove trihalomethane or the like from the water purifier.

[Brief description of drawings]

FIG. 1 (a) is a sectional view taken along the line II-II of an example of a device for removing trihalomethanes according to the present invention. FIG. 1 (b) is a sectional view taken along the line I-I of an example of a device for removing trihalomethanes according to the present invention.

FIG. 2 is an overall explanatory view of an embodiment in which a device for removing trihalomethane or the like according to the present invention is used in a water purifier.

[Explanation of symbols]

 1 Discharge Pipe 2 Spray Nozzle 3 Rectifier Pipe 4 Connection Tool 5 Air Intake Port 6 Discharge Port 7 Water Purifier Main Body 8 Tap Water Inlet 9 Activated Carbon 10 Hollow Fiber Membrane 11 Trihalomethane Removal Equipment

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Office reference number FI technical display location C02F 1/50 531 T 540 F 560 Z

Claims (3)

[Claims] 1. A device for removing trihalomethanes and the like, comprising: a spray nozzle, a straightening pipe provided on the outer periphery of the spray nozzle, and an air intake port provided between the spray nozzle and the straightening pipe. 2. A device for removing trihalomethanes according to claim 1, which is composed of a synthetic resin containing 1.0 to 5.0 wt% of a silver-based antibacterial agent. 3. A water purifier having a discharge device provided with the device for removing trihalomethanes according to claim 1 or 2.