JP2001149921A - Water treating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decide an exact replacement time of an activated carbon filter cartridge of a residual chlorine removing device used in a front stage of a pure water production device utilizing a reverse osmosis membrane. SOLUTION: This water treating device is provided with a residual chlorine meter 13 for measuring residual chlorine concentration in feed water, and an arithmetic device of a control part 30 obtains the total quantity of removed residual chlorine by the product of measured residual chlorine concentration and the feed water quantity decided by an open time of a water feed valve 11, and the integrated amount is made to a chlorine treated quantity by the filter cartridge of the residual chlorine removing device 10. When the total chlorine treated quantity is over treating performance of the filter cartridge, an alarm informing the fact is generated and the filter cartridge is exchanged. The reliability of the device and the economicity of the operation are attained by detecting the exchange time of the filter cartridge neither too earlier nor too later.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water treatment apparatus, and more particularly to a residual chlorine removal apparatus suitably used for a water treatment apparatus such as a pure water production apparatus having a reverse osmosis membrane.

[0002]

2. Description of the Related Art As a small water treatment apparatus, a reverse osmosis type pure water production apparatus using a reverse osmosis membrane (hereinafter simply referred to as a pure water production apparatus) is known. Reverse osmosis membranes can be applied to membrane separation of various liquids including water. Many small-sized pure water production apparatuses use a synthetic polymer membrane as a permeable membrane and use city water as water supply. In such a small-sized pure water production apparatus, a synthetic polymer membrane is generally deteriorated by an oxidizing agent such as chlorine. Therefore, in order to protect the reverse osmosis membrane, a residual chlorine removal apparatus for removing residual chlorine in city water is used. Provided before the water system.

[0003] As a residual chlorine removing apparatus, an activated carbon filtering apparatus using activated carbon, for example, an activated carbon filter cartridge is used. Such a residual chlorine removing apparatus using activated carbon has a long life in its processing ability. In particular, since the activated carbon filter cartridge has a small removing ability, the cartridge needs to be frequently replaced.

[0004]

Generally, the replacement time of a cartridge or the like is managed on the basis of the number of days, for example, how many months after the start of water flow of the apparatus, the replacement is performed. However, the operation status of the pure water production apparatus differs greatly depending on the user, and may also differ within the user depending on the time. Furthermore, the concentration of residual chlorine in city water varies greatly depending on the region and the date and time. For this reason, simply managing the replacement time of the cartridge by the number of days may result in wasteful use of the cartridge by replacing the cartridge at a point below the processing capacity, or deterioration of the reverse osmosis membrane due to operation exceeding the processing capacity. Troubles such as

[0005] In view of the above, the present invention can effectively manage a residual chlorine removing device that removes residual chlorine from city water or the like using activated carbon, and thus a pure water production device disposed at a subsequent stage. It is an object of the present invention to provide a water treatment apparatus that can effectively and economically prevent the degradation of a reverse osmosis membrane used for the purpose.

[0006]

In order to achieve the above object, a water treatment apparatus according to the present invention includes a residual chlorine removing apparatus for removing residual chlorine in feed water, and the residual chlorine removing apparatus removes residual chlorine. In the water treatment apparatus for processing the supplied water and supplying water of a desired quality, the residual chlorine removal apparatus based on the residual chlorine concentration in the feed water supplied to the residual chlorine removal apparatus and the operation time of the apparatus. It is characterized by comprising an arithmetic unit for calculating the amount of chlorination, and a signal generator for generating a predetermined signal when the calculated amount of chlorination reaches a predetermined value.

[0007] According to the water treatment apparatus of the present invention, the amount of residual chlorine removed by the residual chlorine removing device can be obtained by the residual chlorine concentration in the feed water supplied to the residual chlorine removing device and the operation time of the device. Since a signal is generated when the amount of chlorine reaches the processing capacity of the residual chlorine removing device, maintenance such as replacement of the cartridge of the residual chlorine removing device can be performed immediately. Therefore, the residual chlorine removing device can be economically operated without causing damage to the reverse osmosis membrane and the like used in the pure water production device and the like provided at the subsequent stage.

[0008] The water treatment apparatus of the present invention can be used for any type of water treatment apparatus which is liable to be damaged by residual chlorine, and is particularly preferably used for a pure water production apparatus using a reverse osmosis membrane. Here, the residual chlorine concentration in the feedwater may be measured in advance by manual analysis or the like, and the measured value may be used to operate assuming that the residual chlorine concentration in the feedwater is always constant. It is desirable to install a meter and measure the residual chlorine concentration in the water supply periodically. The residual chlorine meter periodically measures the residual chlorine concentration, and each time the residual chlorine concentration is measured, the arithmetic unit may integrate the residual chlorine concentration based on the measured residual chlorine concentration and the operation time of the device. preferable. In this case, it is possible to perform management such as detecting a minutely replacement time.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in more detail with reference to the drawings based on embodiments of the present invention. FIG.
FIG. 1 is a block diagram showing a main part of a water treatment apparatus according to a first embodiment of the present invention. The present water treatment apparatus includes a residual chlorine removing device 10 configured as an activated carbon filter cartridge for removing residual chlorine from feed water, and a pure chlorine configured as a reverse osmosis membrane module disposed downstream of the residual chlorine removing device 10. It is composed of a water production apparatus 20 and a control unit 30 for performing overall control.

On the water supply side of the residual chlorine removing device 10, a water supply valve 11 and a residual chlorine meter 13 connected to an outlet pipe 12 of the water supply valve 11 are attached. A feed water pump 21 is connected to the outlet pipe 14 of the residual chlorine removing device 13, and the feed water from which the residual chlorine has been removed is supplied to the reverse osmosis membrane module 20 by the feed water pump 21. Reverse osmosis membrane module 20,
The feedwater is filtered by a reverse osmosis membrane disposed inside, and the permeated water that has passed through the reverse osmosis membrane is supplied to a pure water use location via a pipe 22. On the other hand, the water concentrated by the reverse osmosis membrane is discarded via the pipe 23.

The control unit 30 starts operation of the water treatment apparatus according to a control signal from a pure water use place, and
Is opened and the water supply pump 21 is operated at the same time. The control unit 30 measures the residual chlorine concentration by the residual chlorine meter 13 at predetermined time intervals, and inputs this to an internal arithmetic unit. The control unit 30 also accumulates the time when the water supply valve 11 is opened, and sets the accumulated time as the operating time of the residual chlorine removing device.

As the residual chlorine meter 13, a residual chlorine meter utilizing a rotary microelectrode polarographic method is used. This type of residual chlorine meter can continuously measure the concentration of residual chlorine, but since the residual chlorine concentration in city water fluctuates slowly, practically, for example, measurement once a day is sufficient. .

The arithmetic unit of the control unit 30 stores in advance the processing capacity of the filter cartridge of the residual chlorine removing device as a residual chlorine removable amount. The arithmetic unit stores the total time of opening the water supply valve of the water treatment device in one day as the operation time of the device on that day, and uses the product of this and the water supply flow rate per hour peculiar to the device as the water supply treatment amount of the day. . The product obtained by multiplying the residual chlorine concentration measured by the residual chlorine meter 13 and the amount of the supplied water is stored as the residual chlorine removal amount for the day, and the cumulative amount for each day is calculated as the actual residual chlorine removal amount by the filter cartridge. I do. The actual processing amount of the residual chlorine removal is compared with the previously stored processing capacity of the filter cartridge. If the actual processing amount exceeds the processing capacity, an alarm to that effect is generated and the time to replace the filter cartridge arrives. Inform.

According to the water treatment apparatus of the above embodiment, the replacement time of the filter cartridge corresponding to the processing capacity of the filter cartridge can be determined accurately, so that the reverse osmosis membrane of the pure water production apparatus is not deteriorated, and The exchange time can be determined economically. The replacement frequency varies depending on the type of the apparatus, the quality of water supplied, and the like, but is, for example, about once every two to three months.

In the above embodiment, the open time of the water supply valve is measured by paying attention to the fact that the amount of water supply is proportional to the opening time of the water supply valve and that the flow rate of water supply per unit time is unique to the apparatus. Instead of measuring water supply. With this configuration, the amount of water supply can be measured without installing a flow meter. Instead of measuring the opening time of the water supply valve, the operation time of the water supply pump may be measured as the operation time of the device. Further, in the present embodiment, the water supply amount per time is a processing capacity amount specific to the device, but this water supply amount is obtained by measuring the processing capacity amount specific to the device by the measured water supply pressure or the discharge side pressure of the pump. May be determined by correction.

The measurement of the residual chlorine concentration by the residual chlorine meter is as follows.
It can be performed at arbitrary time intervals in consideration of the nature of water supply. Further, continuous measurement may be performed. In this case, when there is a change equal to or more than the predetermined value, the arithmetic unit is operated each time to obtain the amount of chlorine treatment up to that time, and this is integrated. As the reverse osmosis membrane, for example, a cellulose acetate membrane or a synthetic polymer membrane is suitably used. Further, the filter cartridge is not limited to activated carbon, but may be calcium sulfite or the like.

Although the present invention has been described based on the preferred embodiment, the water treatment apparatus of the present invention is not limited to the configuration of the above-described embodiment, but the configuration of the above-described embodiment. Various modifications and changes made from are also included in the scope of the present invention.

In the above-described embodiment, the residual chlorine concentration in the feed water is measured by the residual chlorine meter 13 incorporated in the water treatment apparatus.
The residual chlorine meter 13 is omitted, the residual chlorine concentration in the feedwater is measured in advance by appropriate means, and the residual chlorine concentration in the feedwater is kept constant by using the measured value. Good.

[0019]

As described above, according to the water treatment apparatus of the present invention, the maintenance of the residual chlorine removing apparatus can be performed without affecting the subsequent apparatus due to the residual chlorine. Since the water treatment apparatus can be accurately determined in accordance with the processing capacity of the apparatus itself, there is an effect that the water treatment apparatus can be operated economically without impairing its reliability.

[Brief description of the drawings]

FIG. 1 is a block diagram of a water treatment apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 10: Residual chlorine removing device 11: Water supply valve 12: Water supply valve outlet piping 13: Residual chlorine meter 14: Residual chlorine removing device outlet piping 20: Pure water production device 21: Water supply pump 22: Permeated water piping 23: Concentrated water piping 30 ： Control unit

Claims (1)

[Claims] 1. A water treatment device comprising a residual chlorine removing device for removing residual chlorine in feed water, wherein the water treatment device supplies the water having a desired quality by treating the feed water from which the residual chlorine has been removed by the residual chlorine removing device. An arithmetic unit for calculating the amount of chlorination by the residual chlorine removal device based on the residual chlorine concentration in the feed water supplied to the residual chlorine removal device and the operation time of the device; and the calculated chlorination amount is a predetermined value. And a signal generating device for generating a predetermined signal when the temperature reaches a predetermined value.