JPH0116555Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water treatment device for converting raw water into pure water.

The use of pure water is essential in various industrial fields; for example, in the field of manufacturing semiconductor integrated circuits, it is essential to use ultra-deionized pure water, which is equivalent to theoretically pure water. In such manufacturing fields, a large amount of pure water is used to produce ultrapure water, so raw water such as industrial water, well water, city water, etc. is used as the source water. Since this raw water contains a large amount of impurities, impurity ions, etc., at least a coagulation sedimentation device or a coagulation filtration device and a reverse osmosis device are required. It is common to convert raw water into pure water through these devices. However, this general raw water
Water treatment using a pure water converter has the drawbacks of low pure water production efficiency and high production costs.

Therefore, an object of the present invention is to provide a water treatment device with high production efficiency and low production cost.

In accordance with the above object, the present invention is characterized in that the heating treatment of input water, which is essential for using the reverse osmosis device, is carried out at a stage upstream of a coagulation filtration device disposed upstream of the reverse osmosis device. It is something.

The present invention will be explained below with reference to the drawings.

FIG. 1 is a block diagram of an example of a conventional water treatment system. In this figure, Wo means raw water and Wp means treated purified water. First of all,
The raw water Wo is coagulated and filtered in a coagulation filtration device 11, then heat-treated in a heating device 12, and then supplied to a reverse osmosis device 14 via a safety filter F13, where it is almost completely purified. The safety filter 13 is an accessory of the reverse osmosis device 14, and the above-mentioned coagulation filtration device 11, heating device 12, and reverse osmosis device 14 are the main components. In particular, the final stage reverse osmosis device 14 is extremely effective for deionization treatment, and has been widely put into practical use in recent years. This is a reverse application of the principle of osmotic pressure. For example, one side of a spirally wound cellulose acetate semipermeable membrane is kept at normal pressure, and the other side of the semipermeable membrane is kept under high pressure (for example, 30 kg/cm ³ ), impurity ions, etc. in the water flowing through the semipermeable membrane are removed. Therefore, the permeated water becomes pure water Wp. In this case, if the cellulose acetate semipermeable membrane becomes clogged, the differential pressure between the outside and the outside of the semipermeable membrane, so-called ΔP, decreases and production efficiency deteriorates, so the safety filter 13 is usually used. Moreover, as a prerequisite, it goes without saying that a coagulation filtration device 11 or the like should be arranged at the front stage. On the other hand, in order to increase the production efficiency of the reverse osmosis device 14, it is necessary to maintain the supplied water at a predetermined temperature, which is generally maintained at about 25°C. The heating device 12 maintains the supplied water at about 25°C,
This is an important device for increasing capacity. in the end,
The apparatus shown in FIG. 1 first removes impurities, colloids, etc. from raw water Wo, and thereby
4 and prevents clogging in the heating device 12.
(approximately 25° C.) to increase the production efficiency of the reverse osmosis device 14 and obtain pure water Wp. However, in the water treatment apparatus using the apparatus shown in FIG. 1, the coagulation effect changes depending on the temperature of the raw water, resulting in poor production efficiency and, therefore, increased production costs.

Therefore, the present invention proposes a water treatment device realized by the device shown in FIG. In FIG. 2, the same reference numbers or symbols as in FIG. 1 are attached to the same components. As is clear from comparing the two figures, the difference between the two is that the heating device 12 has become the heating device 21 and is disposed upstream of the coagulation filtration device 11. However, heating device 1
2 (FIG. 1) and heating device 21 (FIG. 2) are both heating means (described later).
Although the device shown in FIG. 2 is the same as the device shown in FIG. 1 with a different arrangement of the heating device, its effect is enormous. In FIG. 2, the coagulation filtration device 11 processes raw water Wo heated by the heating device 21. Therefore, the coagulation filtration characteristics of the present device 11 are uniform and highly efficient. This is because the coagulation filtration characteristics are also greatly influenced by water temperature. This means that
This is particularly effective when performing coagulation filtration on raw water in cold regions or in regions with large seasonal temperature fluctuations.

Thus, according to the water treatment device shown in FIG.
Stable, high-quality water is already obtained before the safety filter 13, and so-called after-settlement (slag) does not occur. Reverse osmosis equipment 1 because it is high quality water
4 is eliminated, the differential pressure (ΔP) of the cellulose acetate semipermeable membrane can be stably maintained, and production efficiency is increased. Furthermore, the frequency of cleaning and replacement of the cellulose acetate semipermeable membrane due to clogging is reduced, resulting in a reduction in production costs. Looking at this in reverse, it means that a heating device 21 that is different from the conventional heating device 12 (FIG. 1) can be used. Conventional heating device 12 (Fig. 1)
In order to avoid increasing the contamination of the raw water, the supplied water was heated by a so-called heat exchange method in which the heated steam S and the supplied water were completely separated. Therefore, the heating device 12 (FIG. 1) is relatively expensive, and the heat exchange efficiency is not very high. On the other hand, the heating device 21 shown in FIG. 2 can be of a type that directly sprays heating steam S onto the raw water. This is because even if raw water and steam S are mixed, there is almost no need to worry about the generation of some degree of contamination of the raw water since the coagulation filtration properties are highly efficient. Furthermore, since the steam S is directly sprayed, inexpensive equipment can be used. In addition, because the heat exchange efficiency is high, even if the heating device 21 is placed in the first stage (even if it is placed further away from the reverse osmosis device), the water temperature in the reverse osmosis device 14 can be maintained with the same amount of energy as in the case of Fig. 1. can be maintained at approximately 25℃. In addition, since the after-sedimentation is eliminated and the coagulation effect is stabilized, the frequency of replacing the cellulose acetate semipermeable membrane is reduced (as mentioned above), and the frequency of replacing the safety filter 13 is also reduced.
Since the life cycle is improved, it also leads to lower production costs overall.

As explained above, according to the present invention, a water treatment device that is effective in improving production efficiency and reducing production costs can be realized, although the process is almost the same as the conventional method.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an example of a conventional water treatment device, and FIG. 2 is a block diagram showing a water treatment device of the present invention. In the figure, 11 is a coagulation filtration device, 14 is a reverse osmosis device, 21 is a heating device, Wo is raw water, Wp is pure water, and S is steam.

Claims (1)

[Claims for Utility Model Registration] A water treatment device that converts raw water into pure water through at least a coagulation filtration device and a reverse osmosis device to which the coagulation filtration water from the coagulation filtration device is supplied in a heated state, comprising: the coagulation filtration device; A heating device for heating water is arranged on the raw water side of the coagulation filtration device, and
A water treatment device characterized in that the heating device is a heating device that directly sprays steam onto the raw water to heat it.