JP2000319944A - Water supply system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To supply safe water, and to efficiently supply water different in a water quality by supplying a part of clean water to an inversely permeating membrane module by branching off a water supply pipe, and respectively sending permeated water and concentrated water obtained thereby through second/ third water supply pipes. SOLUTION: Clean water pressurized by a pressurizing pump 8 arranged in a water supply main pipe 1 is mostly sent as it is to respective rooms through a water supply pipe 7, and a part is supplied to an inversely permeating membrane module 11 arranged by branching off the supply pipe 7. The clean water supplied to the inversely permeating membrane module 11 is separated into permeated water and concentrated water, the permeated water is sent to the respective rooms through a high quality water pipe 9 and the concentrated water is sent to the respective rooms through a low quality water pipe 9, respectively to thereby obtain three kinds of water different in a water quality such as untreated clean water, the permeated water and the concentrated water separated by the inversely permeating membrane module 11 to efficiently supply water different in a water quality according to use.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water supply system for building structures such as buildings and mobile structures such as campers.

[0002]

2. Description of the Related Art Conventionally, in a water supply system for buildings and condominiums, as shown in FIG. 2, tap water is temporarily stored in a water storage tank 2 from a water supply main pipe 1, and a water pump 3 and a water pump 4 are provided.
Via a water supply pipe 7 and then to each room by gravity, or as shown in FIG. 3, water is stored in a water tank 2 After storing the water, the water is fed directly to each room by a pressure pump 8 through a water supply pipe 7.

However, in the water supply system shown in FIGS. 2 and 3, the water storage tank 2 and the elevated water tank 6 are apt to be contaminated, and if they are not properly maintained, there is a fear that safe water cannot be obtained. Therefore, recently, as shown in FIG. 4, a method has been adopted in which a pressurizing pump 8 is installed in the water supply main pipe 1 and the water is directly sent to each room through the water supply pipe 7 without providing any water tank.
Spreading.

[0004]

However, with the recent deterioration of river water and groundwater quality, the quality of clean water has also deteriorated. Although the treatment capacity of the water purification plant is improved by the water purification method using the separation membrane, the water quality is deteriorated again by the deteriorated water supply main pipe 1 buried along a long path.
For this reason, safe water suitable for drinking cannot be obtained.

[0005] On the other hand, there is also a problem of inefficiency that high-purified clean water in a water purification plant is used for applications where high water quality is not required, such as waste disposal in toilets, car washing, and watering in gardens. It has become. Therefore, an object of the present invention is to provide a system capable of supplying safe water and efficiently supplying water having different water qualities.

[0006]

According to the present invention, there is provided a water supply system for supplying water to a place of use through a water supply pipe, wherein the water supply pipe is branched and a part of the water is supplied to a reverse osmosis membrane module. Is supplied, and the resulting permeated water and concentrated water are respectively sent through second and third water supply pipes.

[0007] In the water supply system of the present invention, a reverse osmosis membrane module is permanently installed. A part of the tap water is sent to the place of use through the water supply pipe as before, but the remaining tap water is separated into permeated water and concentrated water by the reverse osmosis membrane module and sent to the place of use through separate water pipes. Can be
Therefore, when the water supply system of the present invention is applied to a structural building such as a building or a mobile structure such as a camper, three types of clean water, safe permeated water having better water quality, and concentrated water having poor water quality can be obtained. Different types of water can be obtained.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of a water supply system of the present invention will be described with reference to the drawings. FIG. 1 is a diagram illustrating a water supply system in a building.

In the present embodiment, most of the clean water pressurized by the pressurizing pump 8 installed in the water supply main pipe 1 is sent to each room through the water supply pipe 7 as it is, but a part thereof is supplied to the water supply pipe 7. Is supplied to a reverse osmosis membrane module 11 provided by branching. The clean water supplied to the reverse osmosis membrane module 11 is separated into permeated water and concentrated water, and the permeated water is supplied to the high quality water pipe 9.
, The concentrated water is sent to each room through the sewer pipe 10.

Therefore, according to the present embodiment, it is possible to obtain three types of water having different water qualities, ie, clean water without being treated by the reverse osmosis membrane module 11, permeated water separated by the reverse osmosis membrane module 11, and concentrated water. Can be. Therefore, tap water can be used in kitchens, washrooms, baths, and the like, and permeated water can be used as drinking water. In addition, since the concentrated water may be used for waste disposal in a toilet, it is efficient without waste.

[0011] There is no particular limitation on the reverse osmosis membrane module 11, in order to the same extent as conventional water supply system according to the operating pressure of the pressure pump 8 in FIG. 4, 5 kg / cm ²
It is preferable to use a reverse osmosis membrane module 11 that functions sufficiently even at a low differential pressure. For example, a 0.05% aqueous solution of NaCl at a water temperature of 25 ° C. is applied at a pressure of 5 kg / cm ² and a film area of 37%.
When supplied to a reverse osmosis membrane of m ² , it is preferable to use one having a rejection of 98% or more and a permeated water amount of 30 m ³ / day or more. In the water supply system of the present invention, FIG.
3, a water storage tank 2 or an elevated water tank 6 may be provided as in the conventional water supply system shown in FIG.

[0012]

[Example] Module equipped with a polyamide-based composite reverse osmosis membrane having a membrane area of 37 m ² (spiral type, manufactured by Nitto Denko Corporation)
A 0.05% aqueous solution of NaCl at a water temperature of 25 ° C. was supplied at different pressures, and the rejection of salt and the amount of permeated water at each pressure were examined. Table 1 shows the results.

[0013]

[Table 1] From the results in Table 1, it was found that the reverse osmosis membrane module exhibited a high rejection rate and a high permeated water amount. Therefore, the permeated water obtained thereby has good water quality and is safe to drink. In addition, since it shows a sufficiently high value even at a low pressure, FIG.
When this reverse osmosis membrane module is used in the water supply system according to the embodiment shown in (1), the operating pressure of the pressurizing pump 8 can be made approximately the same as the conventional one.

[0014]

The water supply system of the present invention is provided with a reverse osmosis membrane module, which separates a part of clean water into permeated water and concentrated water, so that water having different water qualities can be efficiently used depending on the application. Can be supplied. In addition, the permeated water has good water quality and is safe, so it is suitable for drinking.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a water supply system according to an embodiment.

FIG. 2 is a diagram illustrating a conventional water supply system.

FIG. 3 is a diagram illustrating a conventional water supply system.

FIG. 4 is a diagram illustrating a conventional water supply system.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 water supply main pipe 2 water storage tank 3 water pump 4 water pump 5 building 6 elevated water tank 7 water supply pipe 8 pressurized pump 9 high quality water pipe 10 low quality water pipe 11 reverse osmosis membrane module

Claims (2)

[Claims] 1. A system for feeding clean water to a place of use through a water supply pipe, wherein the water supply pipe is branched and a part of the clean water is supplied to a reverse osmosis membrane module. Water supply system characterized in that water is sent through second and third water supply pipes, respectively. Wherein said reverse osmosis membrane module, membrane area 37 the 0.05% NaCl aqueous solution of a water temperature 25 ° C. at a pressure 5 kg / cm <sup>2
2. When</sup> supplied to a reverse osmosis membrane of m ² , it exhibits a rejection of 98% or more and an amount of permeated water of 30 m ³ / day or more.
A water supply system according to item 1.