JPH0746391Y2 - Water treatment filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a water treatment filter for adsorbing and reducing chlorine contained in tap water and the like.

(Prior Art) There is a filter for water treatment using activated carbon for adsorbing chlorine from tap water containing chlorine before use to reduce the chlorine content. In this case, the treated water that has passed through the filter has a lower limit value of the residual chlorine amount in order to prevent the generation of bacteria before use, and an upper limit value to prevent the smell of chlorine from being set, and is appropriately set depending on the conditions ( For example, 0.2 ppm or more and 0.3 ppm or less). The chlorine content of the treated water needs to be maintained at a value within this range.

FIG. 2 shows such a conventional water treatment filter 21.
An activated carbon layer 25 is sandwiched and fixed by porous support plates 26, 27 in a container 22 having a water inlet 23 and an outlet 24. Tap water enters through the inlet 23, adsorbs chlorine in the activated carbon layer 25, and flows out through the outlet 24 to the point of use.

(Problems to be solved by the invention) With such a water treatment filter, the adsorbing performance of activated carbon is deteriorated as it is used, and the amount of residual chlorine gradually increases to exceed the above upper limit. It is desirable to increase the filter life.

However, in the conventional type as shown in Fig. 2, if the activated carbon layer to be stored is increased, the amount of chlorine adsorbed is large (the dechlorination efficiency is high) at the beginning of use and the amount of chlorine that should remain in the treated water becomes less than the above lower limit. There is a risk of bacterial growth. Therefore, it is not possible to use more than a certain amount of activated carbon for the flow rate of water, which limits the life of the water treatment filter to be relatively short.

As a countermeasure against this, it is considered that a relatively large amount of activated carbon is stored and a bypass passage is provided so that excessive chlorine adsorption of activated carbon at the initial stage of use is compensated by a bypass flow. For example, a water inlet such as the water treatment filter 31 in FIG.
33, an activated carbon layer 35 sandwiched between porous support plates 36, 37 is provided in a container 32 having an outlet 34, and a pipe-shaped bypass passage 38 is provided through the activated carbon layer 35 to allow a part of water to pass therethrough. . In the figure, 39 is an orifice that determines the cross-sectional area of the bypass passage. However, the life of such a water treatment filter 31 is not extended for the increased amount of activated carbon, but the upper limit is reached early. This is because the chlorine adsorption action of activated carbon becomes dull as it approaches saturation, and solid particles such as dust contained in water adhere to the activated carbon to inhibit the adsorption action and the fluid of the activated carbon layer. This is because the resistance is increased (hereinafter referred to as clogging), and the flow rate ratio of the bypass passage is increased accordingly.

Therefore, this invention delays the time when the residual chlorine amount reaches the upper limit value by advancing the clogging of the filter medium in the bypass passage in order and adjusting the flow distribution ratio between the activated carbon layer and the bypass passage appropriately.

(Means for Solving the Problems) In the water treatment filter of the present invention, an activated carbon layer is disposed in a container having an inlet and an outlet, and a pipe that penetrates the activated carbon layer through the inlet and the outlet is provided. A bypass passage is formed by providing a filter medium support therein and mounting a filter medium that partitions the inlet side and the outlet side.

(Operation) In the water treatment filter of the present invention, the water flowing in from the water inlet is divided into the activated carbon layer and the bypass passage to pass through, and is discharged from the water outlet to the use place. The activated carbon layer contains a relatively large amount of activated carbon, and the amount of residual chlorine in the water that passed through is extremely small. However, when combined with the water that passes through the bypass passage, the residual chlorine in the treated water at the target is set. It is set to exceed the lower limit of the value. (This may be determined by selecting the ratio of the bypass passage cross-sectional area to the total passage cross-sectional area and the fineness of the filter pore size of the filter medium to determine the initial flow rate ratio.) The adsorbing performance of activated carbon gradually decreases with use. Then, the amount of residual chlorine in the treated water tends to increase (dechlorination efficiency decreases), and this tendency is promoted by clogging of activated carbon. However, since the bypass filter media progresses faster in clogging, the distribution ratio of the flow rate increases so that the flow rate passing through the activated carbon layer increases from the initial rate, and the distribution is distributed so as to compensate for the above-mentioned decrease in dechlorination efficiency. Change. As a result, the residual chlorine amount of the treated water at the outlet is maintained relatively stable, the increase in the residual chlorine amount (decrease in dechlorination efficiency) as a whole is small, and the period until the upper limit is reached becomes long.

In this case, the bypass passage is blocked from the activated carbon layer by the pipe, and the treated water does not flow into and out of the bypass passage in the middle of the activated carbon layer, so the transition of the flow distribution of the bypass passage and the activated carbon amount is detected, and It is easy to systematically manage and control the residual chlorine content.

(Embodiment) FIG. 1 shows an embodiment of the present invention. Water treatment filter 1
Is a cylindrical container 2 having a water inlet 3 and a water outlet 4, and is sandwiched by porous support plates 6 and 7 to contain spherical activated carbon and form an activated carbon layer 5. A pipe 11 that connects the porous support plates 6 and 7 and penetrates the activated carbon layer 5 is provided to connect the inlet 3 and the outlet 4 and a ring-shaped filter medium support is provided in the pipe 11.
A bypass passage 8 is formed by providing the filter medium 9 with the filter medium 10 installed. In this example, the activated carbon layer 95 gr, the bypass passage cross-sectional area is 20% of the total passage cross-sectional area, and the filter medium has a nominal pore size of 3 μ.

Water with a chlorine concentration Co = 1ppm in the water treatment filter above q
Fig. 4 shows the results of water flow at = 1.8 l / min. Curve B is the conventional one containing 75gr of activated carbon and no bypass (second
Fig.), And it must be 75gr or less in order not to exceed the lower limit M (0.2ppm) in the initial stage, and the life up to the upper limit N (0.3ppm) is as short as ₁ (cumulative treated water amount Q ₁ ). Light In this case, if the activated carbon is set to 95 gr (C-line), the dechlorination efficiency is too high in the initial stage (90%), and the residual chlorine amount becomes the lower limit Mp.
It is less than pm, which is inappropriate. Curve A shows the characteristics of this invention. In the initial stage, due to the action of bypass, the overall dechlorination efficiency becomes 70%, and the upper limit of the residual chlorine amount N (0.3 p
pm).

The flow rate distribution to the activated carbon layer increases sequentially due to the clogging of the filter medium, and the adsorption performance of the activated carbon itself deteriorates, which is offset by the increase in the flow rate distribution, and the period during which it is maintained in the range of N to M (0.3 to 0.2 ppm) It is long (the cumulative water treatment amount Q is large).

FIG. 5 is a diagram of another embodiment of the present invention, in which the activated carbon layer 95
r, bypass passage cross-sectional area 40%, nominal media filter pore diameter 30μ
An example in the case of is shown. In the figure, a curve D shows the characteristics of the water treatment filter of the present invention, and a curve E shows the characteristics of a conventional water treatment filter using 95 gr of activated carbon without a bypass. In this example, the range of maintaining the residual chlorine content of the treated water is represented by dechlorination efficiency and is intended to be maintained at 40 to 60%.

The experimental values according to this invention are shown below. According to Table 1, the clogging of the filter medium sequentially limits the flow rate of the bypass passage, increases the flow rate sharing of the activated carbon layer with reduced adsorption performance, and maintains the overall dechlorination efficiency stably. Is understood.

(Effect of the Invention) The water treatment filter of the present invention is provided with the activated carbon layer and the bypass passage having the filter medium, thereby preventing an excessive decrease in the residual chlorine amount due to the bypass action in the initial stage of use,
To reduce the adsorption performance of activated carbon that accompanies use, the filter material is gradually clogged to reduce the bypass flow rate and increase the flow rate distribution to the activated carbon layer to maintain the residual chlorine content of the treated water. By doing so, it is possible to store a large amount of activated carbon and to show stable chlorine efficiency within the target range from the initial stage, which can be maintained for a long period of time. That is, a water treatment filter having a long life or a large treatment capacity can be obtained. In addition, since the bypass passage does not mix the treated water into and out of the activated carbon layer and keeps the chlorine content as it is in the raw water, the transition of the flow rate distribution is detected from the progress of clogging of the two and the overall flow rate is detected. It is possible to easily manage the residual chlorine amount systematically.

[Brief description of drawings]

FIG. 1 is a diagram of an embodiment of the water treatment filter of the present invention, and FIG.
FIG. 3 is a view of a conventional water treatment filter, and FIG. 3 is a view of a water treatment filter in which a bypass passage is added to the conventional one. Fourth
FIG. 5 is a diagram showing the characteristics of the water treatment filter. 3 ... Inlet, 4 ... Outlet, 5 ... Activated carbon layer 8 ... Bypass passage, 9 ... Filter medium A, D ... Characteristic curve of water treatment filter of the present invention B, C, E ... Conventional water treatment Filter characteristic curve M ... ppm lower limit, N ... ppm upper limit

Claims (1)

[Scope of utility model registration request] 1. An activated carbon layer is provided in a container having an inlet and an outlet, a pipe penetrating the activated carbon layer and communicating with the previous inlet and outlet is provided, and a filter medium support is provided in the pipe to provide a filter medium support, A water treatment filter in which a bypass passage is formed by mounting a filter medium that divides a pipe into an inlet side and an outlet side.