JPS5851907A - Concentration apparatus - Google Patents

Abstract

PURPOSE:To concentrate a liquid to be treated without applying high pressure, by a method wherein a concentrator is divided into the side of the liquid to be treated and a salt solution side by a diaphragm and a treated liquid is flowed through the former and a salt solution through the latter respectively. CONSTITUTION:For example, a radioactive waste liquid is flowed into a concentrator 10a by a pump 15 to remove moisture therein by a diaphragm 11 and further concentrated successively while passed through concentrators 10b, 10c, 10d to be highly concentrated. On the other hand, the moisture permeated through the diaphragm 11 is mixed with a salt solution having a concn. sufficiently higher than that of the waste liquid flowed into from a pipe 16 and the mixed liquid is flowed into a concentrator 18 and the moisture is separated herein to be discharged to the outside. Because this concn. apparatus can remove moisture in good efficiency as compared to a reverse osmosis type apparatus even if the pressure of the waste liquid is low and the diaphragm can be made thin, a treating speed can be increased to a large extent and has high safety because radioactive concn. is low in the concn. apparatus 18.

Description

[Detailed description of the invention] The present invention relates to a concentrator.

For example, radioactive waste fluid discharged from nuclear power plants and the like is concentrated to a high concentration and then stored in drums or the like for disposal.

1-Concentration of such radioactive waste liquid has conventionally been carried out using, for example, a reverse osmosis type concentrator.8 Figure 1 shows such a reverse osmosis type concentrator. The pressurized radioactive waste liquid is passed through a diaphragm 2 made of a permeable membrane, for example.
Water flows into the high-concentration side 4 of the container 6, which is divided into two, from the high-concentration side 4, and after water is removed by the diaphragm 2 and becomes highly concentrated, it flows out from the high-concentration side 4 outlet 6.

On the other hand, the water that has passed through the diaphragm 2 flows out from the outlet 8 of the low concentration side 7.

However, in the reverse osmosis type concentrator configured in this way, the radioactive waste liquid has a higher concentration, so in order for the water in the radioactive waste liquid to permeate through the diaphragm 2, a high pressure of up to 100 atmospheres must be applied to the radioactive waste liquid. There is a need.

Therefore, the reverse osmosis type concentrator is required to have pressure resistance sufficient to withstand this high pressure, which has the drawback of making the device large-scale.

In addition, the diaphragm 2 is required to have pressure resistance sufficient to withstand this high pressure, so the thickness of the diaphragm 2 is large, which reduces the processing speed, and the high pressure causes the diaphragm to deteriorate. .

The present invention has been made in response to such conventional circumstances, and includes a concentrator that is divided into two by a diaphragm into a liquid to be treated side and a salt solution side, and piping for flowing the treatment liquid to the liquid to be treated side. It is an object of the present invention to provide a concentrating device characterized by comprising a pipe for flowing the salt solution to the salt solution side.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below with reference to an embodiment shown in the drawings.

In FIG. 2, reference numeral 10a, fib, IOC.

1[1d indicates concentrators arranged in series.

The concentrators 10a, 10b, 10C, and 10d have a waste liquid side 12 and a salt solution side 1 separated by a diaphragm 11 such as a permeable membrane.
It is divided into 6 parts.

Waste liquid side 12 of 10 concentrators, 10b, 10C, 10d
are connected in series by a pipe 14, and a pump 15 is disposed upstream of the concentrator 10a in the pipe 14.

The salt solution sides of the concentrators 10a, 10b, 10C, and 10d (7) are connected in series by a pipe 16 forming a loop, and downstream of the concentrator 108 of this pipe 16 is a pump 17 and, for example, an evaporative concentrator. A salt solution concentrator 18 consisting of a salt solution concentrator 18 is arranged in sequence.

In the concentrator configured as follows ('''--, pump 1
5, and flows into the concentrator 10a L7.The waste liquid such as radioactive waste liquid flows into the concentrator 10a at the interval 11! '(11, l: Water is removed and the concentration becomes high. Furthermore, concentrators 10b and 10C
.

While passing through 10d, it is gradually concentrated and reaches a high concentration.

On the other hand, the water that has permeated through the diaphragm 11 is mixed with a salt solution, such as sodium sulfate or potassium hydrogen phosphate, which has flowed in from the pipe 16, and is then pumped by the pump 17 to the salt solution concentrator 18 (two inflows). Here, it is separated and discharged to the outside.

However, in the concentrator configured as above,
The salt solution side 16 of the concentrators 10a, 101), ioc, and 10d has a sufficiently high concentration of salt solution flowing from the washing liquid side to the concentrators 10a, 101), ioc, and 10d.

Even if the pressure of the waste liquid flowing into the waste liquid side 12 of 10d is sufficiently lower than that of conventional reverse osmosis type concentrators, water can be efficiently removed.

Therefore, the concentrating device is not required to have high pressure resistance unlike the conventional reverse osmosis type concentrating device, so that the device can be simplified.

Furthermore, since the diaphragm 11 can be made smaller, the processing speed can be greatly increased, and since the diaphragm does not deteriorate due to high pressure, the service life can be extended.

Furthermore, since the permeation of moisture into the diaphragm 11 is not performed by physical press-fitting, clogging of the diaphragm 11 is greatly reduced.

Although the concentrator configured as described above requires the salt solution concentrator 18, the radioactivity concentration of the liquid concentrated here is much lower than that in the case of directly concentrating the radioactive waste liquid. Because of its small size, the saline solution concentrator 18 is much safer against radioactivity.

Furthermore, since the reagents used in the salt solution concentrator 18, such as anticorrosion agents, are rarely contaminated with radioactivity, a sufficient amount of reagents can be used.

As described above, according to the present invention, conventional reverse immersion
- It is possible to provide a concentration device that is simpler than a permeation type concentration device, has a higher throughput, and does not cause II clogging to the diaphragm.

[Brief explanation of the drawing]

FIG. 1 is a piping system diagram showing one embodiment of a reverse osmosis type concentrator, and FIG. 2 is a piping system diagram showing one embodiment of the concentrator of the present invention. ioa, tob, 1oc, 1oa-concentrator 11...
...Diaphragm 12...Waste liquid side 13...Salt solution side 18...Salt solution concentrator Patent attorney Suyama Sa - 6-

Claims (1)

[Claims] 1. A concentrator that is divided by a diaphragm into a liquid to be treated and a salt solution, piping for circulating the liquid to be treated to the liquid to be treated, and a salt solution side; A concentrating device characterized by comprising a pipe for distributing the fluid. 2. The concentrating device according to claim 1, wherein a salt solution concentrator for removing moisture from the salt solution is disposed in the pipe through which the salt solution flows. 6. A concentrating device according to claim 1 or 2, wherein the liquid to be treated is radioactive liquid waste.