JPS60150883A - Concentration device - Google Patents

Abstract

PURPOSE:To concentrate efficiently under ordinary temps. and pressure by controlling the temp. difference between a treating liquid and a salt soln. which are supplied on both sides of a membrane within the preset range. CONSTITUTION:The salt concn. C4 in a salt soln. to be charged into a salt soln. chamber 4 is sufficiently increased by a salt soln. concentrator 7, and the difference in salt concn. from the salt concn. C3 in the radioactive waste liquid is kept large. The temp. T3 of the radioactive waste liquid is simultaneously made higher than the temp. T4 by a temp. controller 8 to increase the temp. difference, and to promote the transfer of water from the radioactive waste liquid to the salt soln. The treatment is efficiently carried out in this way.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention provides a method for concentrating radioactive waste liquid, etc. generated in facilities handling radioactive materials such as boiling water nuclear power plants.
- Concerning a concentration device.

[Technical background of the invention and its problems] In general, radioactive waste liquid generated at facilities handling radioactive materials such as nuclear power plants is evaporative! 1a compression device, reverse manga type 1l
4υ is concentrated using a concentrator such as a condenser, and is then dried and solidified. However, in such conventional concentrators, the radioactive waste liquid is treated at high temperature or high pressure, which causes severe corrosion of the equipment and charging materials, resulting in poor durability.Also, the equipment is expensive due to its pressure resistance. There were drawbacks such as.

Recently, this problem has been solved, which means that it can be used at room temperature.
A diaphragm-type concentrator has been proposed that can perform concentration treatment. This concentrator is separated by a diaphragm, and supplies radioactive waste liquid to one side and a salt solution with a higher concentration to the other side, and uses the temperature difference between the two salts to transfer water in the radioactive waste liquid to the salt solution side. By doing so, the radioactive waste liquid is concentrated.

However, although the conditions for this type of concentrator are relaxed, it is only 1q lower than conventional evaporative concentrators and reverse osmosis concentrators. The problem is that efficiency is low.

[Object of the Invention] The present invention has been made in response to the above-mentioned conventional circumstances, and aims to provide a concentrating device that can efficiently concentrate under conditions close to normal temperature and normal pressure. It is.

[Summary of the Invention] The concentration device of the present invention is provided with a diaphragm that allows water in a liquid to be treated to permeate into a salt solution with a higher concentration. The present invention is characterized by the provision of a temperature control device that detects the temperatures of the liquid to be treated and the salt solution and controls the temperature difference within a predetermined range.

[Embodiment of the Invention] The details of the present invention will be described below with reference to an embodiment shown in the drawings.

The drawing shows an i1a reduction circuit according to an embodiment of the present invention.
This is a concentrating device designed for liquid waste liquid management.

In the figure, four concentration tanks 1a11b and 1C11d are arranged in series, and each is divided into two by a diaphragm 2 into a waste liquid chamber 3 and a salt solution chamber 4.

Each waste liquid chamber 3 of these concentration tanks 1a, 1b, lc, and id
are connected in series by a waste liquid pipe 5, and a pump P1 disposed upstream discharges the discharged monochromatic waste liquid to the concentration tank 1aJ.
1) and 1C11d in order to be discharged. Also concentrated +01a, 1b,
Each of the salt solution chambers 1c and 1d is connected in series to a salt solution piping 6, and this salt solution piping 6 is further connected to a Ji solution concentration 7 comprising, for example, an evaporative concentrator or the like pump P2.
is inserted to form a loop, and the salt solution flows through the pump P.
2: Flows from the salt solution chamber 4 of the concentration tank 1d to the salt solution chamber 4 of the concentration tank 1a] It is concentrated to a high concentration in the concentration tank 7 and circulated again to the salt solution chamber 4 of the concentration tank 1d. It's getting better. Note that the salt solution concentrator 7 is connected to a pipe for discharging the steam t9 generated by concentration.

In the present invention, each concentration tank 1a11b11C1
The waste liquid chamber 3 and the salt solution chamber 1d are connected to the salt solution concentrator 7. A temperature control device 8 is provided to control the temperature difference of the salt solution within a suitable range.

In the radioactive waste liquid concentrating device configured as described above, while the radioactive waste liquid passes through the waste liquid piping 5 by the pump P1 and sequentially passes through each waste liquid chamber 3 of the concentration tanks 1a, ib, 1c, and 1d, the pump P2 The Takabuchi salt solution sent from the salt solution section t111 vessel 7 through the salt solution piping 6,
For example, in order to contact a salt solution such as sodium sulfate or potassium hydrogen phosphate with the diaphragm 2 in between, the water in the waste liquid in each concentration tank moves into a salt solution with a high salt concentration (XJ: It is then sequentially concentrated and discharged as a high-temperature radioactive waste liquid.

Here, each i1! Focusing on the movement of moisture in the condensation tanks 1a, 11) and 1C11[1], the water flow 1t)Q from the radioactive waste liquid toward the 1!2 solution is given by the following equation.

That is, Q=D (d C/dx) -D' ・(1-C) (
d T, -'dX) * (D (C4-03) -D
'・<1-C2) In addition, the attached number 2 indicates the diaphragm, 3 indicates the waste liquid chamber, and 4 indicates the salt solution chamber. ing.

Therefore, in the present invention, the salt concentration C4 of the salt solution flowing into the salt solution chamber 4 is transferred to the salt solution concentrator 7 at a sufficiently high level.
bC1 jH'm degree difference between radioactive wastewater jn) and agricultural degree C3 (
C4-C3) is kept large, and the temperature control device r'
The temperature T3 of the radioactive waste liquid is determined by l8)>F of the combined liquid.
a Ia 'r 4 , J: Increase the temperature and make the temperature difference <
T4-T3) is kept sufficiently negative to promote water transfer from the radioactive waste liquid to the salt solution. In addition, theoretically, the temperature difference is 1°
C corresponds to a pressurization of about 20 kg/c+.

In this way, the device of the present invention can control quality differences;
By adding 1 to 1, the processing efficiency can be increased beyond the concentration limit due to only 1 degree difference in salt 11i.

In the above-described embodiments, radioactive waste liquid is treated as a treatment target, but the concentrating device of the present invention is applicable not only to radioactive waste liquid but also to any dilute solution requiring concentration treatment.

['R, Effect of Light] Above) According to the concentrating device of the present invention, various solutions can be efficiently concentrated.

[Brief explanation of drawings]

The drawing shows an embodiment of the concentrating device of the present invention. a Systematic diagram. 1a, 1b, lc, 1d -FJ contraction tank 2...
・・・・・・・・・Diameter 3・・・・・・・・・Waste liquid chamber 4・・・・・・・・・Salt solution chamber 7・・・・・・・・・...Salt solution concentrator 8...
・・・・・・Thirst level control device agent valve Sokujusuyama ν
1-

Claims (2)

[Claims] (1) 'mIi!' is equipped with a diaphragm that allows water in the liquid to be treated to permeate into a salt solution with a higher concentration. The apparatus is characterized by being provided with a temperature control device that detects the temperature of the liquid to be treated and the salt solution supplied across the diaphragm and controls the temperature difference within a predetermined range. A concentrator that uses (2) The liquid to be treated is a radioactive waste liquid.