JPH1149504A - Separator for waste active carbon and water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a separator for waste active carbon and water which is simple in a separating mechanism for the waste active carbon and the water, is capable of separating the water under a low hydrostatic head pressure, is simple in the structure of a storage tank and a discharge water receiver, does not cause the crushing of the waste active carbon and lessens the generation of the powder and filtrate of the waste active carbon. SOLUTION: This separator consists of the waste active carbon storage tank 1 which houses a mixture composed of the waste active carbon 2 and the water 3, the discharge water receiver 4 which has a water head (H) and is arranged adjacently to this waste active carbon storage tank 1 and a water outflow member 5 which is disposed so as to allow the inside of this discharge water receiver 4 to communicate with the inside of the waste active carbon storage tank l and sucks and discharges the water 3 by capillarity. The water outflow member 5 consists of piping 6, and fibrous material 7 consisting of cloth, yarn, cotton, etc. The water 3 in the waste active carbon storage tank 1 is discharged along the fibrous material 7 of the water outflow member 5 by the capillarity and is admitted into the discharge water receiver 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for separating waste activated carbon and water after filtering treated water in a nuclear power plant or a fuel reprocessing facility with activated carbon.

[0002]

2. Description of the Related Art At a nuclear power plant and a fuel reprocessing facility during use, treated water is treated and purified using activated carbon.
For example, in the case of treating used activated carbon in a reprocessing facility, that is, waste activated carbon, after removing water in a waste activated carbon tank, the separated waste activated carbon is stored in a drum or the like.

There are various methods for performing a treatment for removing only water from a mixture of the waste activated carbon. For example, a pressurized filtration method is known in which compressed air is added to the inside of a container using a Nutsche type pressure filter, water is filtered by a filter, and the waste activated carbon that has been heated and dried by a rotating blade is scraped and discharged. Have been. In addition, the mixture of waste activated carbon and water is stored in a container, and the entire container is rotated to generate centrifugal force.The specific gravity difference caused by this centrifugal force separates waste activated carbon on the outer periphery of the container and separates water inside. There is known a centrifugal separation method in which each is discharged. Further, a third separation method combining a pressure filtration method and a centrifugal separation method is known.

[0004]

In the pressurized filtration system, it is necessary to install a compressed air unit and to increase the thickness of the body by pressurizing the container. It is easy to use, requires regular replacement, and requires a lot of energy from heating.

[0005] In the centrifugal separation method, it is difficult to separate powdered activated carbon, which is a light fine suspended substance, and activated carbons collide with each other due to centrifugal force and are crushed. In addition, it often releases the filtrate trapped inside the activated carbon. Furthermore, the structure of the container is complicated,
The installation foundation also needs to be strong in consideration of the centrifugal force, and there are problems such as a complicated rotation mechanism and increased equipment costs.

Further, the third separation method, which combines the pressure filtration method and the centrifugal separation method, has a problem that the activated carbon is often damaged, and the equipment cost for the combination is higher than that of the two methods.

The present invention has been made to solve the above-mentioned problems, and has a simple mechanism for separating waste activated carbon and water, can separate water with a hydrostatic head pressure, and has a simple container structure. Accordingly, it is an object of the present invention to provide an apparatus for separating water from waste activated carbon, which does not involve a step of stirring or the like, does not cause crushing of the activated carbon in the process of separating water, and generates little powder of the activated carbon or a filtrate.

[0008]

According to a first aspect of the present invention, there is provided a waste activated carbon storage tank containing a mixture of waste activated carbon and water, and a water head (H) disposed adjacent to the waste activated carbon storage tank. It is characterized by comprising a discharge water receiver, and a water outflow member which is provided so as to communicate between the discharge water receiver and the waste activated carbon storage tank and sucks and flows out the water by capillary action.

A second aspect of the present invention is characterized in that the water outflow member is made of a pipe and a fiber material such as cloth, thread, and cotton filled in the pipe. The invention of claim 3 is characterized in that the end of the water outflow member in the drainage receptacle is set to be located above the water surface of the drainage receptacle.

According to the first to third aspects of the present invention, there is provided a cloth capable of sucking water out of the water outflow member by capillary action and flowing out.
Use fiber materials such as yarn and cotton. By this water outflow member, only water is transmitted through the fiber material and discharged to the discharge water receiver,
Solid activated carbon waste and residue remain in the waste activated carbon tank.

In order for water to be transmitted through the fiber material and discharged, the discharge water receiver is disposed below the waste activated carbon tank in order to prevent the backflow of water, and the discharge end of the water outflow member is located in the discharge water receiver. Set to be above the water surface of.

According to the first to third aspects, it is not necessary to use a driving force for water separation, so that the operation can be performed with a hydrostatic head pressure, and the structures of the waste activated carbon tank and the discharged water receiver can be simplified. It is possible to separate waste activated carbon and water with extremely low energy consumption.

[0013] The invention of claim 4 is characterized in that the waste activated carbon storage tank comprises a storage tank for a mixture of waste activated carbon and water discharged from a filter of a nuclear power plant or a fuel reprocessing facility.

According to the fourth aspect of the present invention, in the nuclear power plant or the reprocessing facility, the operation of removing water in the process of treating used activated carbon can be simplified. In reprocessing facilities, waste activated carbon does not come out continuously during plant operation, but usually measures the pressure loss around the waste activated carbon tank,
When pressure loss increases due to clogging or the like, the activated carbon is replaced, and about once a month is a reasonable value. Therefore, there is a margin of time for separating the water in the waste activated carbon tank, and the number of the water outflow members and the discharge time may be determined in consideration of each. After drying,
A waste activated carbon can be discharged by putting a stirrer or the like into the waste activated carbon tank.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS With reference to FIG. 1, an embodiment of a device for separating waste activated carbon and water according to the present invention will be described in detail. In FIG. 1, reference numeral 1 denotes a waste activated carbon storage tank in which a mixture of waste activated carbon 2 and water 3 is stored. Reference numeral 4 denotes a discharged water receiver, and the discharged water receiver 4 and the waste activated carbon storage tank 1 are connected by a water outflow member 5. The water outflow member 5 is formed of a pipe 6 filled with a fiber material 7 such as cloth, thread, or cotton.

The fiber material 7 sucks the water 3 in the waste activated carbon storage tank 1 by capillary action, and flows out from the waste activated carbon storage tank 1 into the discharge water receiver 4, and reference numeral 8 denotes outflow water. The waste activated carbon storage tank 1 and the discharged water receiver 4 are arranged vertically with a head pressure (H). In FIG. 1, reference numeral 10 denotes a gas vent hole and a liquid outflow / inflow hole.

As shown in FIG. 1, the mechanism for separating water from the waste activated carbon tank 1 of this embodiment is such that the end of the fiber material 7 is placed in the waste activated carbon tank 1, and the pipe 6 extends from the top of the tank 1. The inside is guided through the fiber material 7 to the discharge water receiver 4 on the side from which the other end is discharged. The type of the fiber material 7 may be a cotton cloth or a chemical fiber having a high water permeability. The nature of the water and the discharge of the fiber material 7 may be determined by setting the time required for water separation on the mechanism of the plant. The material and the number of the fiber materials 7 may be selected in consideration of the capacity.

Incidentally, the waste activated carbon 2 does not continuously come out during the operation of the plant. Usually, the pressure loss around the waste activated carbon tank 1 is measured, and the pressure loss becomes large due to clogging and the like. Activated carbon is sometimes replaced, and in reprocessing facilities etc., about once a month is a reasonable value. Therefore, there is a margin of time for separating the water 3 in the waste activated carbon tank 1, and the number of the water outflow members 5 and the discharge time may be determined in consideration of each. After drying, it becomes possible to discharge the waste activated carbon by introducing a stirrer or the like.

Further, the fiber material 7 from the upper part of the waste activated carbon tank 1
Since the capillary phenomenon is continued up to 10 m under atmospheric pressure, the rising dimension needs to be set within this value.
In this case, it is necessary to dispose the fiber material 7 below the waste activated carbon tank 1 so that water does not flow backward, and to stop the end of the fiber material 7 on the discharge water receiver side above the water surface 9 so as not to contact the water surface 9. There is.

One end of a water outflow member 5 filled with chemical fibers having high water permeability is immersed in a waste activated carbon storage tank 1 in which waste activated carbon and water are mixed, and the other end of the water outflow member 5 is discharged water receiver ( Pipe (pipe) 4 side so as not to touch water.

The water itself is transmitted through the fiber material 7 and gradually discharged to the outside of the waste activated carbon storage tank 1 by the permeation of the cloth due to the capillary phenomenon (the head rises up to 10 m). It will remain in the activated carbon storage tank 1.
In the reprocessing facility, the waste activated carbon is discharged about once a month, so that the time for dewatering the waste activated carbon storage tank 1 can be slowly performed over one month. The discharge method can be said to be compatible.

According to the present embodiment, the pressure applied to the discharge water receiver is only the hydrostatic head, so that the thickness of the discharge water receiver can be reduced, and there is no extra water discharge. There is no need to add energy or equipment, and the separation operation can be performed with extremely low energy consumption. Further, since the compression mechanism is not used, the waste activated carbon is not damaged during dehydration. As a result, it is possible to discharge only water that does not contain solid matter, and thus a considerably beneficial effect can be obtained.

[0023]

According to the present invention, since only water can be discharged from the waste activated carbon tank without using a dynamic mechanism or a pressurizing mechanism, crushing of waste activated carbon does not occur. Further, since the residue trapped in the waste activated carbon is hardly released, the separated water is less likely to be polluted. In addition, since the waste activated carbon storage tank and the wastewater receiver are also used under atmospheric pressure, there is no need to construct a pressure-resistant container, and the thickness of the waste activated carbon storage tank and the wastewater receiver can be reduced, making it possible to separate water. There are effects such as reduction of such operation costs.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view schematically showing a partial side view for describing an embodiment of a separation apparatus for waste activated carbon and water according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Waste activated carbon storage tank, 2 ... Waste activated carbon, 3 ... Water, 4 ... Discharged water receiver, 5 ... Water outflow member, 6 ... Piping, 7 ... Fiber material, 8
... outflow water, 9 ... water surface, 10 ... gas vent hole and liquid outflow hole, H
... water head.

Claims (4)

[Claims] 1. A waste activated carbon storage tank containing a mixture of waste activated carbon and water, a discharged water receiver disposed with a water head (H) adjacent to the waste activated carbon storage tank, and the discharged water receiver And a water outflow member which sucks and flows out the water by capillary action and is provided so as to communicate between the inside of the waste activated carbon storage tank and the waste activated carbon storage tank. 2. The separation device for waste activated carbon and water according to claim 1, wherein the water outflow member is made of a pipe and a fiber material such as cloth, thread, and cotton filled in the pipe. . 3. The waste activated carbon and water according to claim 1, wherein an end of the water outflow member in the drainage receiver is set to be higher than a water surface of the drainage receiver. And separation equipment. 4. The waste activated carbon storage tank according to claim 1, wherein the waste activated carbon storage tank comprises a storage tank of a mixture of waste activated carbon and water discharged from a filter of a nuclear power plant or a fuel reprocessing facility. Water separation equipment.