JP4511820B2 - Sludge electrolyzer - Google Patents

Description

  The present invention relates to an electrolyzer for sludge (including sewage in the present specification), and in particular, prevents adhesion and accumulation of hair, hair pieces, scum, etc. to an electrode, and prevents degradation of the electrolyzer performance due to hindering energization. In addition, the present invention relates to an apparatus for sludge electrolysis that can eliminate the need for a stirrer.

Sludge electrolysis devices are used, for example, for reducing or sterilizing excess sludge generated in facilities that treat wastewater such as sewage, removing phosphorus and nitrogen in liquids, and refining sludge before dehydration. .
In the conventional sludge electrolysis apparatus, a plurality of rectangular electrode plates are fixed to a treatment tank provided with a stirrer, and the sludge is electrolyzed by energizing the electrodes while stirring with the stirrer.

  For this reason, this conventional sludge electrolysis device is used to sterilize microorganisms in surplus sludge, and stir hair, hair pieces, scum, etc. adhere to and accumulate on the electrodes, preventing energization and There was a problem of reducing the ability (see, for example, Patent Documents 1 and 2).

Japanese Patent Publication No. 07-115039 Japanese Patent Publication No. 06-104240

  In view of the problems of the conventional sludge electrolysis apparatus, the present invention prevents adhesion and accumulation of hair, scissors, scum, etc. to the electrode, and prevents a decrease in the capacity of the electrolysis apparatus due to hindering energization, It aims at providing the electrolyzer of sludge which can make installation of a stirrer unnecessary.

In order to achieve the above object, the sludge electrolysis apparatus of the present invention is a sludge electrolysis apparatus that sterilizes microorganisms in sludge by passing a direct current through the sludge introduced into the treatment tank. In a sludge electrolysis apparatus in which a rotating shaft is provided and the electrode plate is rotated about a rotating shaft by a driving device , the electrode plate is formed in a circular shape, and a plurality of electrode plates having different polarities are formed on the rotating shaft. In addition to being alternately arranged in the axial direction, a scraper is extended from the treatment tank side in the vicinity of the electrode plate, and deposits are removed by rotating the electrode plate .

  According to the sludge electrolysis apparatus of the present invention, in the sludge electrolysis apparatus that sterilizes microorganisms in the sludge by passing a direct current through the sludge introduced into the treatment tank, a rotating shaft is provided at the center of the electrode plate, Since the electrode plate is rotated around the rotation axis by the driving device, foreign matter such as hair and wrinkles and scum can be diffused in the outer peripheral direction between the electrode plates and from the side surfaces by centrifugal force. By preventing impurities and scum from adhering to the plate and rotating the electrode plate itself, it is possible to eliminate the need for a stirrer for stirring the treatment tank.

  And by making the said electrode plate into a circle, while making the electrode plate of the adjacent opposite pole into the same shape, adhering of impurities, a scum, etc. is prevented suitably, and rotation of an electrode plate is performed safely. Can do.

  In addition, by arranging a plurality of electrode plates with different polarities alternately in the axial direction on the rotating shaft, it is possible to arrange the cathode and the anode at an appropriate interval and obtain an efficient electrolytic effect. Become.

  In addition to the effect of preventing the adhesion of dust due to the rotation of the electrode plate, the electrode plate is further cleaned by extending a scraper near the electrode plate from the treatment tank side and removing the deposits by the rotation of the electrode plate. be able to.

  Embodiments of the sludge electrolysis apparatus of the present invention will be described below with reference to the drawings.

1 to 2 show an embodiment of the sludge electrolysis apparatus of the present invention.
This sludge electrolysis apparatus sterilizes microorganisms in surplus sludge A by passing a direct current through surplus sludge A introduced into the volume reduction treatment tank 1, and the central part of a plurality of circular electrode plates 22. A rotation shaft 23 is provided through the electrode plate 22, and each electrode plate 22 is rotated about the rotation shaft 23 by the driving device 21.

A plurality of electrode plates 22 having different polarities are alternately arranged in the axial direction on the rotating shaft 23, and comb-like teeth are formed between the arranged electrode plates 22 from the processing tank 1 side. A scraper 3 is extended to remove deposits by rotation of the electrode plate 22.
The electrolytic action of the electrolysis device occurs between the two electrodes of the cathode and the anode, and a plurality of rotating circular electrode plates 22 are installed in the direction of the rotation axis to obtain an efficient electrolysis effect.
Further, although the adhesion of dust to the electrode plate 22 can be sufficiently reduced by the rotation of the electrode plate 22, a scraper 3 made of a highly insulating material such as rubber or resin is installed in the gap between the rotating electrode plates 22, and this scraper. 3, the electrode plate 22 can be cleaned.

The electrode plate 22 is supplied with power from a DC power supply device 24 through a power cable 25, a slip ring 26 and a rotating shaft (rotating power supply shaft) 23.
In addition, the sterilized sludge C sterilized by the electrolysis apparatus 2 in the reduction treatment tank 1 is returned to the water treatment system.
Note that the power supply device is not limited to a DC power supply device, and can be applied to an electrolytic device that includes an AC power supply device and generates an electrolytic action by an electrode plate.

Next, the operation of the sludge electrolysis apparatus of this embodiment will be described.
The electrolytic treatment method used for sludge volume reduction treatment is to add sodium chloride B to excess sludge A and send it to the volume reduction treatment tank 1. Sodium chloride B may be added in the volume reduction treatment tank 1, but it is desirable to add it before flowing into the volume reduction treatment tank 1.

Since the excess sludge A that has flowed into the volume reduction treatment tank 1 contains sodium chloride B, hypochlorous acid is generated in the sludge between the electrode plates 22 of the electrolysis apparatus 2, and the microorganisms that constitute the excess sludge A are sterilized. Is done.
Since this sterilization action acts only between the electrode plates 22 of the electrolysis apparatus 2, it is necessary to always allow the unelectrolyzed sludge that has not been subjected to electrolytic treatment to flow between the electrode plates 22.

  In order to always allow sludge to flow between the electrode plates 22, a powerful stirring device has been conventionally installed in the volume reduction treatment tank 1. However, in this embodiment, the electrode plates 22 themselves rotate. It is not necessary to install a stirrer in the treatment tank 1 in which the 22 is installed.

The electrolysis effect occurs between the electrode plates 22 of the yin and yang electrodes, but between these electrode plates 22, it occurs between the fibrous contaminants such as hair, the contaminants such as the scissors, or between the electrode plates 22. Scum or the like due to fine bubbles adheres and accumulates.
Although the electrolytic effect is remarkably reduced due to such foreign matters and scum adhering to the electrode plate 22, these foreign matters and scum are diverged in the outer peripheral direction of the electrode plate 22 by the centrifugal force caused by the rotation of the electrode plate 22 itself. And the fall of an electrolysis effect can be prevented.
When a conventional electrolysis device is used in a facility that contains sewage or other contaminants or sludge, the contaminants and scum accumulate between the electrode plates and adhere to the sides of the electrode plates. In addition, the present embodiment has made it possible to operate a sludge electrolyzer that is stable for a long period of time and facilitates maintenance.

In addition, it is possible to perform cleaning using the rotational force of the electrode plate 22 by installing a comb-shaped scraper 3 made of rubber or resin having high insulation between the electrode plates 22. The scraper 3 is preferably brought into contact with the electrode plate 22, but the purpose of removing accumulated matter between the electrode plates 22 can be achieved without contact.
Further, as shown in FIG. 1, the electrode plate 22 may be installed at an angle close to perpendicular to the water surface, or as shown in FIG. The angle is not particularly limited.

  The sludge electrolysis apparatus of the present invention has been described based on a plurality of examples. 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. For example, the configuration can be changed as appropriate without departing from the spirit of the invention.

  As described above, the sludge electrolysis apparatus of the present invention prevents the adhesion and accumulation of hair, hair pieces, scum, etc. to the electrodes, prevents the degradation of the electrolysis apparatus performance due to the hindering of energization, and makes it unnecessary to install a stirrer. Because of its characteristics, it can be used for sterilization using electrolyzers, removal of hazardous substances, tempering of sludge before dehydration, etc., especially facilities that treat organic sewage such as sewage It can be used in the sludge treatment process.

It is sectional drawing which shows one Example of the electrolysis apparatus of the sludge of this invention. It is sectional drawing which shows the other Example of the electrolysis apparatus of the sludge of this invention.

DESCRIPTION OF SYMBOLS 1 Volume reduction processing tank 2 Electrolysis apparatus 21 Drive apparatus 22 Electrode plate 23 Rotating shaft 24 Power supply apparatus 25 Power supply cable 26 Slip ring 3 Scraper A Surplus sludge B Sodium chloride C Sterilization sludge

Claims (1)

In a sludge electrolysis apparatus that sterilizes microorganisms in sludge by passing a direct current through the sludge introduced into the treatment tank, a rotating shaft is provided at the center of the electrode plate, and the electrode plate is centered on the rotating shaft by a driving device. In the sludge electrolysis apparatus, the electrode plate is formed in a circular shape, and a plurality of electrode plates having different polarities are alternately arranged in the axial direction on the rotation shaft, and the electrode plate is disposed from the treatment tank side. A sludge electrolysis apparatus characterized in that a scraper is extended in the vicinity and deposits are removed by rotation of an electrode plate .

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