JP2007275728A - Electrolytic treatment device for sludge - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electrolytic treatment device for sludge where, though dimensionally stable electrodes are used, the generation of scale is suppressed by polarity inversion, and stable energizing performance is imparted thereto. <P>SOLUTION: The electrolytic treatment device for sludge is equipped with a polarity inversion circuit of selecting: an energizing state where the cathode plates 2 of the pair electrodes C in the odd-numbered lines are used as the cathodes and also the anode plates 3 of the pair electrodes C in the even-numbered lines are used as the anodes; and an energizing state where the cathodes plates 2 of the pair electrodes C in even-numbered lines are used as the cathodes and also the anode plates 3 of the pair electrodes C in the odd-numbered lines are used as the anodes. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an electrolysis apparatus for sludge, and more particularly to an electrolysis apparatus for sludge that suppresses generation of scale (electrolysis product) caused by electrolysis by polarity reversal while using a shape stabilizing electrode. .

A method for electrolytic treatment of sludge has been proposed and put to practical use as one means for reducing sludge volume (see, for example, Patent Document 1).
This method electrolyzes sludge added with saline and kills bacteria and protozoa in the sludge by using hypochlorite ions and chlorine gas generated on the anode side to kill the bacteria and protozoa in the sludge. It is intended to be biodegradable and reduce sludge volume.

  The sludge electrolysis apparatus used for such a treatment consists of an electrolytic cell into which sludge is introduced, in which cathodes and anodes are alternately arranged. The shape stabilizing electrode (DSE) or the shape stabilizing anode (DSA) Stable performance is obtained by using a so-called titanium surface coated with a platinum-based oxide for the anode.

  At this time, a stainless steel plate or the like is used on the cathode side. On the surface of the cathode, a scale (electrolytic product such as a compound of Ca, Mg, etc.) generated by electrolysis is deposited and becomes a paste-like electrode. A scale that covers the surface and that contains a compound such as Ca or Mg is difficult to conduct electricity, and therefore has a problem of becoming an obstacle to electrolysis as it becomes thicker.

Conventionally, when a carbon electrode is used, growth of electrolytic products at the cathode has been suppressed by periodically reversing the polarity of the electrode and cleaning the bubbles. However, an electrode like the DSE can only be used on the anode side. Since polarity inversion cannot be performed and the cathode product cannot be removed by bubble cleaning alone, new measures are required.
JP 2004-351354 A

  In view of the problems of the above-described conventional sludge electrolysis apparatus, the present invention suppresses the generation of scale by polarity reversal while using a shape-stabilized electrode, and provides sludge electrolysis that has stable current-carrying performance. An object is to provide a processing apparatus.

  In order to achieve the above object, the sludge electrolysis apparatus of the present invention is a sludge electrolysis apparatus in which a negative electrode is provided in an electrolyzer for introducing sludge, and an anode comprising a shape stabilizing electrode on the surface of a cathode plate. A plurality of assembled electrodes arranged in close proximity to each other, and an energized state in which the cathode plate of the odd-numbered grouped electrode is used as a cathode and the anode plate of the even-numbered grouped electrode is used as an anode, A polarity inversion circuit is provided for selecting an energized state in which the cathode plate of the assembled electrode is used as the cathode and the anode plate of the odd-numbered assembled electrode is used as the anode.

  In this case, the anode plate can be configured to allow the electrolyte such as a mesh shape, a bar screen shape, or a metal film shape to pass through.

  According to the sludge electrolytic treatment apparatus of the present invention, a plurality of assembled electrodes in which an anode plate made of a shape stabilizing electrode is arranged close to each other on the surface of the cathode plate are arranged in parallel, and the cathode plates of the odd-numbered assembled electrodes are arranged as cathode Current state where the anode plate of the even-numbered group electrode is used as the anode, and the current state where the cathode plate of the even-numbered group electrode is used as the cathode and the anode plate of the odd-numbered group electrode is used as the anode The polarity reversal circuit that selects between the two electrodes can be reversed while using a shape-stabilized electrode, thereby suppressing the growth of electrolytic products deposited and deposited on the surface of the cathode plate, It is possible to have stable energization performance.

  In this case, by setting the anode plate in such a form that the electrolyte such as a mesh shape, a bar screen shape, or a metal film can permeate, the electrolytic treatment can be favorably performed by freely moving the electrolyte.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a sludge electrolytic treatment apparatus of the present invention will be described with reference to the drawings.

1 to 2 show an embodiment of the sludge electrolytic treatment apparatus of the present invention.
In this sludge electrolysis apparatus, a negative electrode is disposed in an electrolytic cell 1 for introducing sludge. As shown in FIG. 1, an anode plate 3 made of a shape stabilizing electrode is placed close to the surface of a cathode plate 2. A plurality of assembled electrodes C arranged in parallel are arranged side by side.
As shown in FIG. 2, the sludge electrolysis apparatus uses the cathode plate 2 of the odd-numbered assembled electrode C as a cathode and the energized state using the anode plate 3 of the even-numbered assembled electrode C as an anode. And a polarity inversion circuit (not shown) for selecting an energized state in which the cathode plate 2 of the even-numbered assembly electrode C is used as a cathode and the anode plate 3 of the odd-numbered assembly electrode C is used as an anode. .

The assembled electrode C is bonded to the electrolysis side of the plate-shaped cathode plate 2 (on the both sides of the assembled electrode other than the end position) by bonding the mesh-shaped anode plate 3 via the insulator spacer 4 or using an insulating screw or the like. Then, the cathode plate 2 and the anode plate 3 are treated as one electrode integrated in an insulated state.
Such an assembled electrode C is inserted into the sludge of the electrolytic cell 1 at equal intervals, and electrolysis is performed while periodically reversing the poles.
As shown in FIG. 2 (b), the polarity reversal is performed by using the cathode plate 2 of the odd-numbered assembly electrode C as a cathode and the anode plate 3 of the even-numbered assembly electrode C as an anode, As shown in FIG. 2 (a), a current inversion state in which the cathode plate 2 of the even-numbered assembled electrode C is used as a cathode and the anode plate 3 of the odd-numbered assembled electrode C is used as an anode is Select by circuit.

In the embodiment, the anode plate 3 has a mesh shape. However, since the electrolyte can be moved freely, an electrode plate in the form of a bar screen or a metal film can be used.
Moreover, as these anode plates 3, what is called a shape-stabilized electrode (DSE) or a shape-stabilized anode (DSA) is a titanium surface coated with a platinum-based oxide.

Thus, according to the sludge electrolysis apparatus of the present embodiment, a plurality of set electrodes C in which the anode plate 3 made of a shape stabilizing electrode is arranged close to the surface of the cathode plate 2 are arranged side by side, and sets of odd rows are arranged. An energized state in which the cathode plate 2 of the electrode C is used as a cathode and the anode plate 3 of the even-numbered grouped electrode C is used as an anode, and the cathode plate 2 of the even-numbered grouped electrode C is used as a cathode and Since a polarity reversing circuit for selecting the energization state in which the anode plate 3 of the assembled electrode C is used as an anode is provided, it is possible to reverse the polarity between the assembled electrodes C while using the shape stabilizing electrode. It is possible to suppress the growth of the electrolytic product deposited and adhered to the surface of 2 and to have a stable energization performance.
Moreover, by making the anode plate 3 into a shape in which an electrolyte such as a mesh shape, a bar screen shape, or a metal film shape can permeate, the electrolytic treatment can be favorably performed by freely moving the electrolyte.

  The sludge electrolysis apparatus of the present invention has been described based on the examples thereof. However, the present invention is not limited to the configurations described in the above examples, and the configurations described in the examples are appropriately combined. The configuration can be changed as appropriate without departing from the spirit of the invention.

  The sludge electrolytic treatment apparatus of the present invention has the characteristics of suppressing the generation of scale by polarity reversal while using a shape stabilizing electrode, and having a stable current-carrying performance, so in a sewage treatment plant etc. It can be suitably used for an electrolytic treatment apparatus for sludge solubilization.

In the sludge electrolytic processing apparatus of this invention, it is a disassembled perspective view which shows one Example of an assembled electrode. The same sludge electrolytic processing apparatus is shown, (a) is a sectional view showing an energization state to the assembly electrode, (b) is a sectional view showing an energization state to the inverted assembly electrode.

Explanation of symbols

C assembly electrode 1 electrolytic cell 2 cathode plate 3 anode plate 4 insulator spacer

Claims (2)

  In the sludge electrolytic treatment apparatus in which the positive and negative electrodes are arranged in the electrolytic cell for introducing the sludge, a plurality of assembled electrodes in which the anode plate made of the shape stabilizing electrode is arranged in close proximity to the surface of the cathode plate are arranged in parallel. The energized state using the cathode plate of the assembly electrode in the row as the cathode and the anode plate of the assembly electrode in the even row as the anode, and the use of the cathode plate of the even row assembly electrode as the cathode and in the odd row assembly electrode An electrolysis apparatus for sludge, comprising a polarity reversing circuit for selecting an energized state in which an anode plate is used as an anode.   2. The sludge electrolytic treatment apparatus according to claim 1, wherein the anode plate has a mesh-like shape, a bar screen-like shape, or a metal film-like shape through which the electrolyte can permeate.

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