JP2579227B2 - Trihalomethane removal device and water purification device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a water purification device capable of removing trihalomethane contained in water.

<Problems to be Solved by the Present Invention> Tap water contains a substance called trihalomethane that is harmful to the human body.

This trihalomethane is produced by the reaction of chlorine and humin in tap water.

During the year from April 1981 to March 1982, the analysis team of the Yodo River and the water analysis group examined the trihalomethane content of tap water sampled at the faucet of the Yodo River water system.

As a result, it was found that the value of trihalomethane was higher at the downstream sampling point than at the upstream of the Yodo River.

This indicates that the distance from the upstream water purification plant to the water sampling point is proportional to the trihalomethane content.

That is, the longer the contact time between chlorine and humin in tap water, the more trihalomethane is produced.

By the way, water purification plants have an obligation to add a standard amount of chlorine to tap water.

Therefore, when tap water is used at a point away from the water purification plant, chlorine and humin react as described above to generate trihalomethane while flowing over a long distance from the water purification plant to the point of use.

Therefore, while drinking such tap water, trihalomethane gradually accumulates in the human body, which may cause harm to the human body.

<Object of the present invention> The present invention has been made to improve the above-mentioned problems, and an object of the present invention is to provide a device for removing trihalomethane in water and a device for purifying water using the same.

<Means for Solving the Problems> The present inventor has conducted intensive studies in accordance with the above objectives,
Focusing on the gas permeability of the silicone rubber membrane, the present invention as described below has been completed.

According to the present invention, first, a group of capillaries formed by an assembly of capillaries formed of a film made of silicone rubber (having no pores on the film surface) is housed in a container, and the group of capillaries is placed in the group of capillaries. The present invention relates to a trihalomethane removing apparatus having means for generating a negative pressure around a group of tubules while allowing water to pass therethrough.

Secondly, the present invention provides a means for sending water sent from a water source into the trihalomethane removing device, and a means for circulating water treated by the device again into the trihalomethane removing device, and the circulating water. Water purifier comprising means for supplying water to a tap.

Further, a device for removing chlorine dissolved in water can be incorporated in the above-mentioned water purification device, and it is preferable that the device is provided in front of the trihalomethane removal device. In this chlorine removal device,
A filter formed of activated carbon or an ultraviolet irradiator is preferably used.

<Preferred Embodiment> Next, the present invention will be described in detail with reference to examples.

<A> Trihalomethane removing device (FIG. 2) It is known that a membrane of a polymer substance generally has gas permeability.

For example, it is said that the oxygen permeability of silicone rubber reaches 150,000 times the permeation rate of fluororesin. However, it was not conventionally known whether the polymer material membrane has a trihalomethane permeability. However, the present inventor paid attention to the gas permeability of the above-mentioned polymer substance membrane, and as a result of repeated studies, found that a certain kind of membrane has a permeability to trihalomethane.

The trihalomethane removing device 2 of the present invention is a capillary formed by collecting a large number, for example, 100 to 200, of capillaries formed of a film made of the above silicone rubber (however, the film surface has no pores). The group 21 is housed in a tank 22, and one end of the thin tube group 21 communicates with an inflow pipe 23 for water, and the other end has an outflow pipe.
24 are connected.

An intake pipe 25 communicates with the tank 22.
The vacuum pump 26 is connected to the free end of the first (claim 1).

<B> Water Guide, Circulation, Water Supply Means (FIG. 1) The trihalomethane removal device 2 of the present invention is preferably provided with circulation and water supply means when used, and minimizes the amount of trihalomethane as described later. it can.

The water sent from the water source is temporarily stored in a water tank. For example, in the case of tap water, the water sent from the water purification plant is
The water is collected in a water receiving tank installed underground in a building or the like, and is pumped by a water pump to an elevated water tank installed on the roof of the building or the like.

Between the water tank and the trihalomethane removal device 2,
They are connected by a water pipe 3. On the way, a water supply pump 31 is attached. If necessary, the foreign matter filter 4 may be further mounted on the way.

The free end of the water pipe 3 is connected to the inflow pipe 23 of the trihalomethane removing device 2 (claim 2).

At this time, the amount of water supplied by the water supply pump 31 is 0.5 to 1000 t / h
Degree, preferably 1 to 300 t / h.

Next, one end of the circulation pipe 5 is connected to the outflow pipe 24 of the trihalomethane removal device 2, and the other end is connected to a water tank and branched to be connected to the water supply pipe 6.

The free end of the water supply pipe 6 is connected to a faucet 61 of each household.

Therefore, when the faucet 61 is closed, the water circulates in the circulation pipe 5 and the water supply pipe 3, but when the faucet 61 is opened, the circulated water passes through the water supply pipe 6 and the faucet.
It is configured to flow out of 61.

<C> Chlorine Removal Device The above-described water purification device of the present invention may further include a device 1 for removing chlorine dissolved in water on the way of the circulation water channel, and is particularly suitable for application to tap water ( Claim 3). It is preferable that the chlorine removing device 1 be mounted in front of the trihalomethane removing device 2 because the trihalomethane removing effect is improved as described later.

As the chlorine removing device 1, for example, a known device such as a filter formed of activated carbon (claim 4) or a sterilizing lamp for irradiating ultraviolet rays can be used (claim 5).

<D> Chlorine adding device When the chlorine removing device is attached as described above, the chlorine adding device 7 may be attached at the same time along the water supply pipe 6 that has deviated from the circulation path.

In tap water, it is mandatory to add a standard amount of chlorine. However, it has been found that removing trihalomethane first removes chlorine and then removes trihalomethane, which has a large effect of removing trihalomethane. Therefore, after the chlorine in the water is once removed, the reference amount of chlorine removed by the chlorine removing device 1 by the chlorine adding device 7 can be added by the chlorine adding device 7 immediately before water supply to maintain hygiene.

As the chlorine addition device 7, for example, a known device of a dropping type can be used.

<Operation of the Present Invention> Next, the operation of the present invention will be described.

First, the water applied to the trihalomethane removal device and the water purification device of the present invention is not limited, for example, river water, groundwater, and well water, but is preferably used for drinking,
In particular, tap water purified by a water purification plant for drinking is preferable.

<a> Trihalomethane removal step The vacuum pump 26 is operated, the air in the tank 22 is sucked from the suction pipe 25, and a negative pressure is generated around the thin tube group 21. , Let the water sent from the water source pass.

Then, the trihalomethane dissolved in the water in the thin tube group 21 is sucked and discharged from the surface of the thin tube group 21 by the negative pressure.

Therefore, water with a reduced amount of dissolved trihalomethane is discharged from the outflow pipe 24.

Here, the silicone rubber film constituting the capillary is a non-porous material having no pores on its surface, and the discharge of trihalomethane from the surface of the capillary depends only on the gas permeability of the silicone rubber film. Accordingly, trihalomethane is discharged and removed from water with high selectivity, so that the efficiency is high.

<B> Circulation Step The above-mentioned trihalomethane removing device 2 of the present invention minimizes the content of harmful trihalomethane in water by circulating the treated water through the device 2 many times. Can be suppressed.

<C> Chlorine removal process When tap water treated at a water treatment plant is targeted, adding a chlorine removal device to the above water purification device enhances the effect of reducing trihalomethane. This effect is greater when placed in front of the trihalomethane removal device, and it is possible to provide safe and delicious water with no smell.

By the operation of the water pump 31, water flows into the chlorine removal device 1 from the water tank through the water pipe 3.

Here, when water permeates the inside of the activated carbon filter medium, chlorine in the water is removed.

Also, chlorine in water is similarly removed by irradiation with ultraviolet rays.

<D> Action by Chlorine Addition Device In the above case, chlorine in water is removed by the chlorine removal device 1, but tap water is required to add a standard amount of chlorine.

Therefore, according to the present invention, the chlorine addition device 7 may be used as necessary, such as when the water supply path from the water purification device is long.
In some cases, just before using tap water, a reference amount of chlorine can be added to tap water.

Therefore, the minimum necessary amount of chlorine in tap water can be secured.

<Experimental Results> FIG. 3 is a graph showing the relationship between the amount of residual chlorine in tap water and the amount of trihalomethane.

As can be seen from this graph, as chlorine in tap water decreases, the amount of trihalomethane decreases accordingly.

In particular, when the amount of residual chlorine in tap water decreases to 0.4 ppm or less, the amount of trihalomethane also starts to decrease significantly.

Therefore, the chlorine removal device 1 is added to the trihalomethane removal device 2.
If the removal capacity is set so that the residual chlorine is reduced to 0.4 ppm or less, not only can delicious water free of chlorine odor be provided, but also the effect of removing trihalomethane can be further improved.

<Effect of the Present Invention> The trihalomethane removing device of the present invention can selectively permeate and remove trihalomethane. Since the selectivity of trihalomethane by the silicone rubber membrane is high, the negative pressure generated around the capillary works effectively for the removal of trihalomethane, so that it is efficient and large-scale treatment can be performed in a short time.

The main structure of the device of the present invention is a relatively simple structure in which a negative pressure is generated around an assembly of capillaries formed of a silicone rubber film, which can effectively remove trihalomethane, and is stable at low cost. Safe water can be provided.

By providing the trihalomethane removing device with the circulation means, the effect of removing the trihalomethane becomes higher, and by providing the water supply means, it is possible to easily and stably supply safe water.

Further, when chlorine is removed prior to the removal of trihalomethane in the circulation path, the removal rate of trihalomethane is remarkably increased, and delicious water with a small smell of chlorine can be provided.

Therefore, conventionally, when tap water is used at a point away from the water purification plant, chlorine and humin react to generate trihalomethane before the tap water reaches the faucet, and while continuing to drink such tap water, Trihalomethane gradually accumulates in the human body, possibly causing harm to the human body.

However, according to the present invention, it has become possible to remove chlorine contained in tap water, suppress the generation of trihalomethane, and remove trihalomethane itself.

Therefore, even if drinking tap water purified by the device of the present invention, there is no risk of harm to the human body such as carcinogenesis.

[Brief description of the drawings]

FIG. 1: Flow chart of the apparatus of the present invention FIG. 2: Description of trihalomethane FIG. 3: Explanation of the relationship between chlorine and the amount of trihalomethane

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification number Agency reference number FI Technical display location C02F 1/58 C02F 1/58 A

Claims (5)

(57) [Claims] 1. A group of capillaries formed by an assembly of capillaries formed of a film made of silicone rubber (having no pores on the film surface) is housed in a container, and water passes through the group of capillaries. A trihalomethane removing device having means for generating a negative pressure around the group of thin tubes at the same time. 2. A means for sending water sent from a water source into the apparatus for removing trihalomethane according to claim 1, and for circulating water treated by the apparatus again in the apparatus for removing trihalomethane; A water purification device comprising means for supplying water to a faucet. 3. A device for removing trihalomethane according to claim 1, a device for removing chlorine dissolved in water provided in front of the device for removing trihalomethane, and removing water sent from a water source into the device for removing chlorine and trihalomethane. A water purification device, comprising: means for sending water into the apparatus and circulating between the two apparatuses; and means for supplying the circulating water to a faucet. 4. The water purifying apparatus according to claim 3, wherein the chlorine removing apparatus uses a filtering material formed of activated carbon. 5. The water purifying apparatus according to claim 3, wherein the chlorine removing apparatus uses an ultraviolet irradiator.