JPS5815191B2 - High Echinoden Kaishiyori Souchi - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrolytic coagulation treatment apparatus for industrial wastewater, etc.

Conventionally, colloidal pollutants in wastewater have been removed by coagulation treatments such as coagulation sedimentation and pressure flotation.

In recent years, in addition to these methods, electrolytic coagulation treatment, which generates metal hydroxide flocs by electrolysis and removes pollutants, has attracted attention in recent years.

However, the electrolytic structure of the conventional electrolytic coagulation treatment equipment has a plate-shaped soluble anode made of aluminum, iron, etc., stainless steel, etc.
Because many combinations of plate cathodes such as iron were used,
It had drawbacks such as: - low electrode utilization efficiency; - easy to generate scale on the electrodes; - not easy to maintain; and - relatively large electrode spacing and high power consumption.

To compensate for these shortcomings, we have a cylindrical anode that is held opposite the cathode at a minute distance, and a high-speed flow of electrolyte or wastewater to be treated between the two electrodes through a liquid supply port provided on the cathode. An electrolytic coagulation processing device has been developed that features a structure that performs electrolysis at a high current density while feeding the material.

However, since this device also has a circular electrode surface, the peripheral velocity of the electrolyte or waste water flowing between the two electrodes is smaller than the central velocity, and this device has drawbacks such as low scale generation suppression effect.

The purpose of this invention is to eliminate the above-mentioned drawbacks of conventional devices, and the purpose of this invention is to make the passing speed of electrolyte or waste water constant regardless of the position between the two electrodes.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

That is, in FIGS. 1 and 2, 1 is a drain inflow pipe, 2 is
is a cathode made of iron, stainless steel, carbon, graphite, platinum, etc., 3 is a square or rectangular liquid supply port provided on this cathode 2 and communicates with the inflow pipe 1, and 4 is a distance between the cathode 2 and an anode 6, which will be described later. 5 is a guide groove of the insulating spacer provided on the cathode 2, and 6 is a soluble metal such as aluminum or iron, or an insoluble material such as carbon, graphite, or platinum. The anode 7, which has a square or rectangular shape and is installed so that its sides are parallel to the sides of the liquid supply port 3, is insulated because the electrolytic surface of the anode 6 must always be kept constant. Since the point of contact with the spacer 4 must be constantly changed, a connecting shaft is directly connected to a drive source for horizontally reciprocating the anode 6, 8 is an insulated fixing base for fixing the connecting shaft 7 to the anode 6, and 9 is an insulated fixing base. Anode 6 lead terminal, 1
0 is a lead terminal of the cathode 2, 11.12 is a drain tank for the electrolytic layer, 13.14 is a drain pipe, and 15 is an electrolytic cell.

Furthermore, since the anode 6 is slid back and forth by the drive source, the size of the liquid supply port 3 provided in the cathode 2 of the electrolytic treatment apparatus A is smaller than that of the anode 6 while it is sliding. ing.

On the other hand, 16 is a drainage supply pump, 17 is a supply valve, 18
19 is a flotation separation tank, 20 is a skimmer for scraping the floating scum 20, 22 is a storage tank for collecting the floating scum 20, 23 is a drain valve, and 24 is a drain pipe. It is.

These components constitute a flotation separation device B.

Next, the operation of the device will be described according to this embodiment.

First, the drained liquid sent by the drained liquid supply pump 16 is guided to the inflow pipe 1 via the liquid supply valve 17, and flows at high speed between the anode 6 and the cathode 2 to which a voltage is applied from the liquid supply port 3.

The gap between the two electrodes is maintained at 0.5 to 1.0 rr)/m by an insulating spacer 4 in a guide groove 5 provided in the cathode 2, and the drained liquid is subjected to an electrolytic action while passing through this gap.

The small gap between the electrodes means that the resistance to conduction is low and the current density can be high, making the device more compact. It is possible to suppress the formation of scale on the electrode surface.

In the electrolysis, when a soluble anode is used, flocs of metal hydroxide are generated from the anode, and when an insoluble anode is used, oxidizing gases such as oxygen are generated from the anode.

On the other hand, a reducing gas such as hydrogen is generated from the cathode.

The drained liquid from the electrolytic layer flows into the drained liquid receiving tank 11.12 and the outflow pipe 13.
．． The flocs are led into the flotation separation tank 19 through the scum 14, and the generated flocs contain fine bubbles generated from the cathode 2 and the auxiliary electrolysis electrode group 18, have a flotation property, and become floating scum 20, which is separated from the processing liquid. Ru.

The floating scum 20 is scraped off by the schema 21 and collected in the storage tank 22.

On the other hand, the processing liquid is discharged through a drain pipe 24 via a drain valve 23 .

It is also optional to add a polymer flocculant at the entrance of the flotation tank 19 to promote the growth of flocs.

In summary, in the device of the present invention, the electrode surface of the anode is square or rectangular, the liquid supply port is square or rectangular, its sides are arranged parallel to the sides of the electrode surface, and the gap between the anode and cathode is The size of the liquid supply port provided on the cathode was made smaller than that of the anode during sliding.
The flow rate of the electrolytic solution or the liquid to be treated between the electrodes becomes high and uniform, the effect of suppressing electrode scale formation can be significantly increased, and the maintenance and management of the apparatus can be made extremely easy.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view showing an embodiment of the electrolytic treatment apparatus of the present invention, and FIG. 2 is a flow diagram showing a waste liquid treatment apparatus using the electrolytic treatment apparatus of the present invention. In the figure, 1 is an inflow pipe, 2 is a cathode, 3 is a liquid supply port, 4 is an insulating spacer, 5 is a guide groove, 6 is an anode, 7 is a connecting shaft, 8
1 is an insulated fixed stand, 9 and 10 are lead terminals, 11.12 is a drainage tank, 13.14 is an outflow pipe, 15 is an electrolytic tank, 16 is a supply pump, 17 is a liquid supply valve, and 18 is a group of electrodes for auxiliary electrolysis. , 19 is a floating separation tank, 20 is floating scum, 21 is a skimmer, 22 is a storage tank, 23 is a drain valve, 24 is a drain pipe, A
is an electrolytic treatment device, and B is a flotation separation device. In addition, the same parts in the figures are indicated by the same reference numerals.

Claims (1)

[Claims] 1. It has an anode and a cathode facing each other, an electrolytic solution or a waste liquid to be treated is passed between the two electrodes through a liquid supply port provided on the cathode, and a voltage is applied between the two electrodes. In an electrolytic treatment device for wastewater that removes contaminants by adding an insulating material to the anode, a gap between the anode and the cathode is kept small via an insulating spacer, and the electrode surface of the anode is square or rectangular, and the electrode surface of the anode is formed into a square or rectangular shape, and The liquid inlet has a square or rectangular shape, the side of the liquid supply port is arranged parallel to the side of the electrode surface of the anode, and a drive source is provided to slide the anode on the insulating spacer, An apparatus for electrolytic treatment of waste liquid, characterized in that the liquid supply port is made smaller than when the anode is sliding.