JPH0671299A - Concentrator - Google Patents

Abstract

PURPOSE:To accelerate the sedimentation of suspended particles, to greatly improve the concentration efficiency, to shorten the time required for concentration and to miniaturize concentration equipment by arranging an electrode in parallel with the bottom surface in the lower part of a concentrating tank, arranging an electrode up and in parallel with the electrode and connecting both electrodes each to a power source. CONSTITUTION:Two electrodes 2, 3 are installed in parallel with the bottom surface in a concentrating tank 1 and connected to a DC power source 4 outside the tank so that the upper electrode 2 and the lower electrode 3 may be a cathode and an anode respectively. These electrodes 2, 3 each have nearly the same size as that of the bottom surface and have a lot of liquid permeable meshes provided on the surface of the electrodes and are formed into a metal grating with corrugated cross section and held at constant intervals facing each other through connecting members 5 made of insulating material installed in the four corners. DC voltage is applied to liquid to be concentrated to settle negatively charged suspended particles in the liquid on the anode side in a lower part by an electrophoresis phenomenon, and causing the supernatant with suspended particles decreased and the concentrated liquid to be discharged from a discharge pipe 8 and a lower discharge pipe 9 respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concentrating device for removing water in order to reduce the volume of muddy water or mud-like substances, and particularly to improve the concentration efficiency by applying a DC voltage to the liquid to be concentrated.

[0002]

2. Description of the Related Art Conventionally, when concentrating muddy water or the like to reduce its volume, the liquid to be concentrated is filtered through a filter cloth laid on a grid on the bottom of the filter in the filter or the liquid to be concentrated in the tank. The supernatant was removed by waiting for the suspended particles therein to settle to obtain a concentrated solution.

[0003]

In the concentration by the conventional filtration method, the deterioration of the filtration function caused by the clogging of the filter cloth during the filtration cannot be avoided, and there is a serious problem in terms of efficient concentration. . In the gravity settling method, which waits for the spontaneous settling of suspended particles in the concentrated liquid in the concentrating tank, the suspended particles are negatively charged, so that solvation is likely to occur, so that the sedimentation speed becomes extremely slow and It took a long time to get there. Therefore, the present invention, by applying a DC voltage to the liquid to be concentrated,
The purpose was to accelerate the sedimentation speed of suspended particles and increase the concentration efficiency.

[0004]

In order to achieve the above object, the present invention provides a concentrator for removing water from mud or mud-like substances, in which an electrode is arranged below the concentrator and parallel to the bottom of the concentrator. An electrode was arranged in parallel with this electrode and above the concentrating tank, and both electrodes were connected to a power source. The two electrodes were held face-to-face at regular intervals via an insulator, and the pair of electrodes held face-to-face were attached to the lifting device.

[0005]

The suspended particles in the liquid to be concentrated in the concentration tank are usually negatively charged, and the sedimentation speed thereof is extremely slow. Therefore, when the liquid to be concentrated is sandwiched by two electrodes parallel to the bottom of the tank, and the upper electrode is the cathode and the lower electrode is the anode, and a DC voltage is applied between them, the suspension is negatively charged due to the electrophoretic phenomenon. The turbid particles are electrically attracted to the lower anode, promoting settling of suspended particles. As a result, as the liquid to be concentrated is concentrated, the liquid to be concentrated is divided into two layers, a supernatant layer on the upper layer and a concentrated layer on the lower side, with the sedimentation interface as a boundary. Further, since these two electrodes are fixed to each other via an insulator and attached to the lifting device, even when the sedimentation interface of the liquid to be concentrated is lowered due to the progress of concentration, the electrode of the lifting device can be dealt with accordingly. The pair of electrodes is lowered by an operation so that the two electrodes always sandwich the sedimentation interface, that is, the upper electrode of the two electrodes, which is the cathode, is above the sedimentation interface, and the lower electrode is the anode. The voltage can be applied while being below the sedimentation interface.

[0006]

EXAMPLE This example will be described with reference to FIG. In the concentrating device according to the present invention, suspended particles in the liquid to be concentrated in the concentrating tank 1 are allowed to settle, and the supernatant liquid thereof is discharged, so that the liquid to be concentrated can be reduced in volume and concentrated. In the concentration tank 1,
DC provided outside the tank so that the two electrodes 2 and 3 are provided parallel to the bottom of the tank, the upper electrode 2 is the cathode, and the lower electrode 3 is the anode. It is connected to the power supply 4. Both the electrodes 2 and 3 have substantially the same size as the bottom surface of the concentrating tank 1. Further, a large number of permeation eyes are provided on the electrode surface so that liquid can smoothly permeate, and the metal has a corrugated cross section. It is formed in a grid made of. In addition, the electrodes 2 and 3 are formed so as to be held face-to-face at regular intervals via the insulating connecting members 5 provided at the four corners of the electrodes. Further, the central part of the electrode 2 is connected to the elevating device 6 so that the electrodes 2 and 3 can be uniformly moved up and down.
The elevating device 6 is configured, for example, so that a long elevating member 7 can be moved up and down by a drive motor 6a. The lower end of the elevating member 7 is connected to the central portion of the electrode 2 to concentrate the pair of electrodes 2 and 3. It can move vertically in the tank 1. Therefore, while the elevating member 7 is moved up and down according to the height of the sedimentation interface of the liquid to be concentrated in the concentration tank 1, a voltage can be constantly applied to the liquid to be concentrated while holding the pair of electrodes so as to sandwich the sedimentation interface. It is like this. As the lifting device 6, a winch capable of winding a non-conductive cord may be used so that the tip of the cord can be connected to the central portion of the electrode 2. A discharge pipe 8 communicating with the outside of the concentration tank 1 is provided on the upper side wall of the concentration tank 1, and an opening / closing valve 8a is attached to the discharge pipe 8. That is, applying a DC voltage to the liquid to be concentrated,
The negatively charged suspended particles in the liquid to be concentrated are allowed to settle on the anode side below the concentrating tank by an electrophoretic phenomenon, and the supernatant liquid of the upper layer of the liquid to be concentrated, in which the suspended particles are reduced, is opened by opening and closing the opening / closing valve 8a. It can be discharged outside the tank. Further, a discharge pipe 9 having an opening / closing valve 9a is attached to the lower side wall of the concentration tank so that the concentrated liquid after discharging the supernatant liquid can be discharged.

Further, a sensor for automatically detecting the sedimentation interface of the liquid to be concentrated is provided in the concentration tank 1, and the elevating device 6 is operated in response to the detection signal of the sensor so that the sedimentation interface automatically moves in accordance with the vertical movement of the sedimentation interface. The pair of electrodes may be vertically movable. Alternatively, a separate lifting device may be provided for each of the electrodes 2 and 3, and the distance between the pair of electrodes may be adjusted freely so that the range to which the DC voltage is applied can be adjusted freely.
In addition, a floating member may be attached to the upper surface of the electrode 2 so that the electrode surface is always below the liquid surface regardless of the height of the liquid surface. Further, the electrode does not have to be an integrated planar electrode having substantially the same size as the bottom surface of the concentrating tank 1, and a plurality of electrodes may be shared to cover the entire voltage application surface. Further, in this embodiment, the lower electrode 3 was used as the anode and the upper electrode 2 was used as the cathode. However, when the suspended particles are positively charged, the lower electrode 3 is used as the cathode and the upper electrode 2 is used as the cathode. Alternatively, a direct current voltage may be applied with the electrode 2 in 1 as an anode.

[0008]

According to the present invention, a DC voltage can be applied to the liquid to be concentrated in the concentration tank to promote the sedimentation of suspended particles, and the concentration efficiency can be greatly improved. As a result, the processing capacity of the concentrating tank is improved, and it is possible to shorten the concentrating time and the downsizing of the concentrating device, which conventionally required a long time.

[Brief description of drawings]

FIG. 1 is a cross-sectional explanatory view of the front of a concentrating device when a liquid to be concentrated is full of water.

[Explanation of symbols]

 1 Concentrator 2 Electrode 3 Electrode 4 DC power supply 7 Lifting member

Claims (2)

[Claims] 1. In a concentrating device for removing water from muddy water or mud-like substances, an electrode is arranged below the concentrating tank in parallel with the bottom surface of the concentrating tank, and an electrode is arranged in parallel with this electrode and above the concentrating tank. Then, a concentrating device characterized in that both electrodes are respectively connected to a power source. 2. The two electrodes according to the preceding paragraph are held face-to-face at regular intervals via an insulator, and the pair of electrodes held face-to-face are attached to an elevating device so that they can be moved up and down. 1. The concentrating device according to 1.