JP3234334B2 - Cleaning method of filter cloth in filter press type electroosmotic dewatering machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter cloth traveling type filter press type electric press for improving the dehydration degree by electroosmosis by applying electricity while compressing and dewatering a liquid to be dehydrated such as excess sludge by pressurization. The present invention relates to a method for cleaning a filter cloth of an osmotic dehydrator.

[0002]

2. Description of the Related Art Conventionally, in this type of electroosmotic dewatering machine, a filter cloth does not move up and down, and a filter rod fixed to the filter cloth is detached from the filter cloth by hitting a supporting rod supporting the filter cloth. A filter press is provided by a filter press type dehydrator and a winding means, and the filter cloth is provided so as to be able to move up and down freely. The filter cake is detached from the filter cloth by lowering a filter cloth hanging rod which suspends the filter cloth. There is a filter press type dehydrator called a filter cloth traveling type.

[0003] In such a filter press type electroosmotic dewatering machine, it is necessary to wash the filter cloth after the filter cake is detached. After the detachment, as shown in FIG. 1, the filter cloth hanging rod 5 is once raised to the uppermost position, and then the filter cloths 4a and 4b are removed.
The filter cloths 4a and 4b have been washed by spraying a cleaning liquid from a spray nozzle 10 provided below the filter cloth.

[0004]

However, when the filter cloths 4a and 4b are washed with the filter cloth suspension rod 5 once raised to the uppermost position, the filter pressure is increased as shown in FIG. The cloths 4a, 4b swell, and as a result, there is a problem that the filter cloths 4a, 4b adhere to the electrode plates 2a, 2b carelessly.

In particular, the electrode plates 2a and 2b of this type have a smooth surface (not shown) in order to uniformly charge the liquid to be dehydrated in the filtration chamber (not shown). It was even more likely to occur.

As a result, the attached filter cloths 4a and 4b are
There is a disadvantage that it is necessary to peel off from a and 2b, and the work becomes complicated.

After washing the filter cloths 4a and 4b, the filter cloth
As the wire descends, the wire 15 from the drum 6 also attempts to descend. However, since the filter cloths 4a and 4b adhere to the electrode plates 2a and 2b and do not move, the wire 15 cannot descend and is shown in FIG. It is in a bent state like this. In this case, the constant torque springs 8a, 8b themselves may be damaged, and the filter cloth is wound up by the urging force of the constant torque springs 8a, 8b and the adhesion of the filter cloths 4a, 4b to the electrode plates 2a, 2b. There is also a danger that the wire 15 will come off from the drum 6. Also,
If the filter plates 1a, 1b are closed in this state, the filter cloths 4a, 4b may be damaged.

In order to prevent the filter cloths 4a, 4b from bulging during washing as described above, it is necessary to increase the torque of the constant torque spring. In this case, the filter cloths 4a, 4b and There is a problem that the load applied to the cloth hanging bar 5 also increases.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and prevents the filter cloth from being inadvertently attached to the electrode plate, whereby the filter cloth is damaged, the spring is damaged, and the drum is damaged. An object of the present invention is to prevent the wire from coming off from the wire and to maintain the spring at a low torque.

[0010]

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and means for solving the problem includes electrode plates 2a, 2b inside filter plates 1a, 1b. The filter cloths 4a and 4b are provided inside the electrode plates 2a and 2b so as to be able to move up and down by the winding means.
In a method for cleaning a filter cloth in a filter press type electroosmotic dewatering machine provided with a cleaning liquid jet nozzle 10 for cleaning the filter cloths 4a, 4b below the filter cloths 4a, 4b, the filter cloths 4a, 4b are lowered. After removing the filter cake from the filter cloths 4a and 4b,
When the filter cloths 4a, 4b rise from the lowered position, the cleaning liquid is sprayed from the spray nozzle 10 to wash the filter cloths 4a, 4b.

That is, as described above, when the filter cloths 4a, 4b are washed by spraying the cleaning liquid from the spray nozzle 10 when the filter cloths 4a, 4b are raised from the lowered position, the electrode plates 2a, 4b of the filter cloths 4a, 4b are cleaned. Two
An upward force is applied to the filter cloths 4a, 4b by a force larger than the adhesive force to the filter cloth b, and the filter cloths 4a, 4b are peeled off from the electrode plates 2a, 2b and rise together with the filter cloth hanging rods 5. Therefore, the filter cloths 4a, 4b
Does not inadvertently adhere to the electrode plates 2a, 2b.

[0012]

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

First, in describing a method of cleaning a filter cloth in a filter press of an electroosmotic dehydrator as one embodiment, a structure of a filter press of the electroosmotic dehydrator will be described.

In FIG. 1, reference numerals 1a and 1b denote filter plates, inside which electrode plates 2a and 2b are provided.

Reference numeral 3 denotes a diaphragm interposed between the one filter plate 1a and the electrode plate 2a. The diaphragm 3 is configured so that compressed air is introduced to the back side (the filter plate 1a side) and expands toward the diaphragm 3 side. I have.

Reference numerals 4a and 4b denote a pair of filter cloths suspended from a filter cloth suspending rod 5.

Reference numeral 6 denotes a filter cloth 4a, 4b through the filter cloth hanging rod 5.
And is rotatably attached to the rotating shaft 7.

Reference numerals 8a and 8b denote constant torque springs, which are configured to pull the filter cloth downward through the winding rollers 9a and 9b.

Reference numeral 10 denotes a spray nozzle for cleaning the filter cloth.

The operation of the electroosmotic dehydrator as described above will be described. First, as shown in FIG. 2, sludge of the material to be dehydrated is pressed into the filtration chamber 12 for filtration. As shown in FIG. 3, the diaphragm 3 is operated to squeeze the sludge cake in the filter cloths 1a and 1b,
A voltage is applied to 2a and 2b, and dehydration is further performed by electroosmosis.

After one dehydration is completed in this way, the space between the filter plates 1a and 1b is opened as shown in FIG. 4, and the filter cloths 4a and 4b are pulled down as shown in FIG. To take out.

Next, a case where the filter cloths 4a and 4b are washed after the filter cake 14 is taken out of the apparatus as described above will be described.

When the dehydrated cake 14 is taken out of the machine as described above, the filter cloth hanging rod 5 which suspends the filter cloths 4a and 4b is located at the lowermost position.

While gradually raising the filter cloth hanging rod 5 from the lowermost position, the washing water is sprayed from the spray nozzle 10 as shown in FIG.

At the time of such washing, the filter cloth hanging rod 5
The filter cloths 4a and 4b are appropriately pulled by the constant torque springs 8a and 8b because the filter cloths 4a and 4b are located at a relatively lower position, not at the top as in the conventional case. Is carried out when the filter cloths 4a, 4b are raised, so that the filter cloths 4a, 4b are pulled upward by the raising of the filter cloth hanging rod 5, and rise without adhering to the electrode plates 2a, 2. Therefore, the filter cloths 4a and 4b are
Therefore, it does not bulge to the side, and therefore does not inadvertently adhere to the electrode plates 2a, 2b side.

In the above embodiment, the winding drum 6 is used as a means for winding the filter cloths 4a, 4b. However, the means for winding the filter cloths 4a, 4b is not limited to this. The filter cloths 4a, 4b
Should be provided so as to be able to move up and down freely.

Further, the type of the cleaning liquid injected from the injection nozzle 10 is not limited to the water of this embodiment, but may be any cleaning liquid that can wash the filter cloths 4a and 4b.

In addition, the structures of the filter plates 1a and 1b, the electrode plates 2a and 2b, the diaphragm 3 and the like are not limited to those in the above-described embodiment, and can be arbitrarily changed in design.

[0029]

As described above, the present invention relates to a method of washing the filter cloth after the filter cake has been detached by spraying the cleaning liquid from the spray nozzle when the filter cloth rises from the lowered position. Therefore, there is an effect that the careless attachment of the filter cloth to the electrode plate can be prevented as in the case where the filter cloth is at the uppermost position as in the conventional cleaning method.

As a result, there is an advantage that a complicated operation of peeling off the attached filter cloth is not required.

Further, since the filter cloth can be prevented from adhering, there is an advantage that damage to the constant torque spring and detachment of the wire from the winding drum can be prevented, and there is no damage to the filter cloth.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a filter press as one embodiment.

FIG. 2 is a schematic sectional view when sludge is injected.

FIG. 3 is a schematic sectional view at the time of operation of a diaphragm.

FIG. 4 is a schematic sectional view showing a state where a filter plate is opened.

FIG. 5 is a schematic sectional view when a dehydrated cake is detached.

FIG. 6 is a schematic cross-sectional view when the filter cloth is washed.

FIG. 7 is a schematic sectional view showing a conventional filter cloth cleaning method.

FIG. 8 is a schematic sectional view of a state after the filter cloth has been washed.

[Explanation of symbols]

 1a, 1b: Filter plate 2a, 2b: Electrode plate 4a, 4b: Filter cloth 6: Winding drum 10: Spray nozzle

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) B01D 35/06

Claims (1)

(57) [Claims] An electrode plate (2a), (2) is provided inside a filter plate (1a), (1b).
b), and filter cloths (4a), (4b) are provided inside the electrode plates (2a), (2b) by winding up by winding means so as to be vertically movable, and the filter cloth (4a) is provided. , (4b) below the filter cloth (4a), (4b)
In the method for cleaning a filter cloth in a filter press type electroosmotic dehydrator provided with a cleaning liquid injection nozzle (10) for cleaning the filter cloth (4a) and (4b), the filter cloth (4
After removing the filter cake from (a) and (4b), when the filter cloths (4a) and (4b) rise from their lowered positions, the cleaning liquid is sprayed from the spray nozzle (10) to spray the filter cloth (4a). And (4b), wherein the filter cloth is washed by a filter press type electroosmotic dehydrator.