JPH1015309A - Washing method of filter cloth in dehydrator and dehydrator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely and strongly wash a filter cloth through simple without providing a specific means. SOLUTION: In the washing method of filter cloth in a dehydrator, a washing device is provided which has a plurality of injection holes 11 for injecting washing liquid for filter cloths provided among a plurality of filter plates to wash the filter cloths. The injection holes 11 of the above-mentioned washing device are freely closably provided. At time for heavy duty washing, washing liquid is injected for filter cloths in such a state that some of the injection holes 11 are closed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for washing a filter cloth in a dehydrator such as a filter press for compressing and dehydrating a liquid to be dehydrated such as excess sludge by pressurization, and to an improvement of the dehydrator.

[0002]

2. Description of the Related Art Conventionally, sludge is introduced between a dehydrator, particularly a filter plate provided with an electrode plate, and squeezed by the filter plate.
In a filter press type electroosmotic dewatering machine, which simultaneously supplies electricity and filters and dewaters sludge by pressure and electroosmosis, a method of removing cake after dehydration is, for example, hanging from a filter cloth hanging rod to which a filter cloth is fixed. There is a type in which the cake is detached from the filter cloth by vibrating the filter cloth by hitting the hanging rod of the filter cloth with a hitting means such as a hammer.

In such a filter press type dehydrator, the cake is dropped from the filter cloth and removed by the tapping means after each filtration and dehydration, but the solid matter clogged in the filter cloth is only subjected to vibration. And it is difficult to remove it reliably. Therefore, after a day of use, the filter cloth is usually sprayed with a cleaning liquid by a cleaning device such as a cleaning nozzle to drop solid substances clogged on the filter cloth.

[0004] Such washing with a washing liquid is usually carried out by raising and lowering the washing device between the two filter plates with the filter plate opened, and spraying the washing solution from the washing device onto the inner surfaces of the filter cloths on both sides. .

[0005] Alternatively, a means such as a winding drum for winding the filter cloth is provided below the filter cloth, and while the filter cloth is wound by the winding means, washing water is sprayed by a washing device to filter the cloth. In some cases, the cloth is washed.In this case, the washing device is fixed, and the washing liquid is sprayed onto the moving filter cloth with the filter plate opened in the same manner as described above to remove the filter cloth. Had been washed.

[0006]

However, even if such daily washing is performed, as the filter press type dehydrator is used for a long period of time, the cake of the filter cake adheres firmly to the filter cloth. And it was difficult to remove it by ordinary washing. Therefore, there is a case where a strong washing is performed periodically, for example, about once every several months, to wash the filter cloth by high-pressure washing that is stronger than normal washing.

[0007] In the case of performing this powerful cleaning, the cleaning power is not sufficient with the spraying of the cleaning water by a normal cleaning apparatus. Therefore, conventionally, the filter plates are separated and a human enters between the two filter plates.
Scraps on the filter case adhering from the filter cloth were rubbed off, washed with chemicals with a high cleaning effect, or sprayed with high-pressure water from a hose, etc., but this manual cleaning takes time and In addition, since this is an operation for cleaning sludge cake such as factory wastewater, there is a problem that dust, dust, harmful substances, and the like are scattered and the environment is poor for workers.

Therefore, it is conceivable to provide a cleaning device capable of cleaning more strongly than a normal cleaning device separately from a cleaning device for normal cleaning. However, separately providing such a device is costly, and the device itself is expensive. It is not preferable because it becomes large.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and an object of the present invention is to provide a simple and reliable cleaning of a filter cloth without any special means.

The present invention has been made to solve such a problem, and means for solving the problem are as follows.
Cleaning of a filter cloth in a dehydrator provided with a cleaning device 10 having a plurality of injection holes 11 for spraying a cleaning liquid onto the filter cloth 3 provided between the plurality of filter plates 1 to wash the filter cloth 3 In the method, an injection hole 11 of the cleaning device 10 is provided so as to be openable and closable, and a cleaning liquid is sprayed onto the filter cloth 3 in a state where some of the injection holes 11 are closed during strong cleaning. It is in.

The dehydrator is characterized by a plurality of filter plates.
1, a filter cloth 3 is provided between the filter cloths 3, and the filter plate 1 is movably provided to squeeze and dewater the sludge in the filter cloth 3. The dehydrator main body is provided with a washing device 10 having a plurality of spray holes 11 for spraying the cleaning liquid, and at least some of the spray holes 11 are provided so as to be able to be closed at the time of strong cleaning. It is in.

That is, as described above, each of the plurality of injection holes is provided so as to be openable and closable, and at the time of intense cleaning, some of the injection holes are closed from those at the time of normal cleaning to reduce the number of open injection holes. To inject cleaning water in the state
Without providing any special means, the washing water can be sprayed onto the filter cloth at high pressure during the strong washing by the ordinary washing device for washing.

[0013]

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

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

In FIG. 1, reference numeral 1 denotes a plurality of filter plates which are disposed so as to be movable in the horizontal direction, and each adjacent filter plate 1 is connected to each other by a mountain-shaped link mechanism 2 so as to be capable of coming and coming from each other. It becomes.

Reference numeral 3 denotes a pair of filter cloths disposed between the respective filter plates 1, and reference numeral 4 denotes a filter cloth hanging rod attached to an upper end of the filter cloth to suspend the filter cloths.

Reference numeral 6 denotes a pair of guide rails disposed above the filter plate 1 and is formed of I-beam. 7
Is a head provided with rolling wheels 8 which tend to move on the guide rails 6, and the wheels 8 are driven by driving means (not shown) built in the head 7 to move on the guide rails 6 in the horizontal direction. It is configured to be.

A numeral 9 shown in FIG. 2 is disposed above the filter cloth hanging rod 4 so as to strike the filter cloth hanging rod 4 to give an impact, and drives an air cylinder or the like built in the head 7. It is a tapping body provided to be vertically reciprocable by means (not shown).

Numeral 10 denotes a washing device for washing the filter cloth. The tip 12 of the washing device 10 has a substantially T-shape as shown in FIG.
Injection holes 11 are formed on the both sides so as to inject a total of 20 washing waters so that the washing water can be simultaneously sprayed onto the filter cloths 3 on both sides.

Each injection hole 11 is provided with a valve 14 which can be opened and closed, as shown in FIG. 3 (b), and a nozzle 11a is attached to the tip. This valve 14 is formed so that each injection hole 11 can be opened and closed independently. The opening and closing of the valve 14 is manually opened and closed, respectively.

Further, hoses 16 for supplying washing water are connected to both sides of the distal end portion 12 through mounting portions 16a.
The washing water introduced into the interior of the tip 12 from the
Injected from 11. The hose 16 is a hose drum rotatably provided by a driving means provided in the head 7.
15 is provided so that it can be wound up.

The lower end of the hose 16 is connected to the inside of the tip of the cavity, and the washing water supplied from a water pipe (not shown) via the hose 16 is supplied to the inside of the tip.

Reference numeral 13 denotes a telescopic link member connected to a support rod 20 mounted on the hose drum 15 via a mounting member 21 so that the distal end portion 12 is wound around the hose drum 15 when the filter cloth 3 is washed. When the connected hose 16 is extended downward, the link member 13 extends, and the mounting portion between the link member 13 and the mounting member 21 rises along the elongated hole 21a, and the support rod 20 is extended.
And stop at the lower end of the filter cloth 3 when the tip 12 descends.

Next, a case will be described in which the cake adhered to the filter cloth 3 is removed after the filtration operation is completed using the filter press type electroosmotic dehydrator having the above configuration.

First, the filter body 1 at the end is moved to open the link mechanism 2, and the pair of filter cloths 3 is separated from each other. Slap, filter cloth 3
Vibration is applied to drop the cake. At this time, even when the pair of filter cloths 3 is opened, a part of the cake is separated from the filter cloth 3 by the weight of the cake.

After removing the cake of the filter cloth in this way, the filtration and dehydration operations are repeated again. However, if the cake is dropped only by hitting the filter cloth hanging rod 4 with the beating body 9,
In some cases, a small amount of solid matter adheres to the filter cloth 3 and cannot be completely removed.

Therefore, there is a case where the washing operation is performed after a certain operation is completed, for example, after a day's filtration operation is completed. In order to perform this washing operation, first, the space between the filter plates 1 at the end is opened, the head 7 is horizontally moved upward between the opened filter plates 1, and the hose 16 is connected as shown in FIG. While being extended, the washing water supplied from the hose 16 is sprayed toward the filter cloth 3 from the nozzle 11a of each injection hole 11 while lowering the distal end portion 12, thereby washing the inside of the filter cloth 3 on both sides.

When the pair of filter cloths has been washed, the hose 16 is again wound on the hose drum 15 and rises above the filter plate 1, the filter plate 1 is closed, and the next pair of adjacent filter plates 1 is removed. Open and close. The cleaning device 10 moves in the horizontal direction together with the head 7, and moves up and down while jetting the cleaning water between the opened filter plates 1 to sequentially wash the filter cloth 3.

As described above, after the one-day filtration operation, the above-described normal cleaning operation is performed every day. At the time of this normal cleaning operation, the injection holes 11 of the tip 12 open all the valves 14. The washing operation is performed by spraying the washing water in the state.

By performing such washing every day after the filtering operation, the cake which could not be separated from the filter cloth by the tapping body 9 can be washed and removed. However, since this normal washing is performed every day, the filtering operation is performed. In a relatively short time from the end of the process to the start of the next filtration operation. Therefore, it is difficult to completely remove the cake of the filter cloth 3, and a small amount of solids may remain on the filter cloth. Therefore, it is necessary to perform a strong cleaning once every several months, which has a stronger cleaning power than the normal cleaning.

A description will be given of the case where the strong cleaning is performed. First, 10 pairs of the front end portions 12 of the cleaning device 10 and 20 injection holes 11 are provided.
Among them, for example, the valves 14 of two pairs and four injection holes 11 on one end side are opened, and the rest are closed. Then, as in the case of the normal cleaning, the link mechanism 2 is sequentially opened to separate the filter plates 1, and the tip 12 of the cleaning device 10 is lowered into the space between the filter plates 1 while the injection holes 11 Cleaning water is sprayed from the nozzle 11a toward the filter cloth surface to perform cleaning.

Accordingly, the washing water is sprayed onto the filter cloth 3 from the two pairs of four orifices 11 which are open. At this time, the water pressure at which the washing water is sprayed is such that the other spray holes 11 are closed. Therefore, even if the water pressure in the hose 16 is the same as that during the normal cleaning, the water pressure injected from the injection hole 11 increases, and
Can be washed.

In this state, when the cleaning device 10 is reciprocated up and down one time, the filter cloth 3 opposed to the portion of the opened injection hole 11 is opened.
Is washed vertically.

Next, the valve 14 of the injection hole 11 is closed, the valves 14 of the next two pairs of four injection holes 11 are opened, and the washing device 10 is similarly moved up and down to remove the filter cloth. 3 and filter cloth 3
The washing is carried out by reciprocating up and down a plurality of times so that the entire width of is washed.

In the above embodiment, the valve 14 is connected to each injection hole.
Each of the valves 14 is formed to be openable and closable manually, but this valve 14 may be mounted, for example, one by one, and is not manually opened and closed. It can be opened and closed. Further, it is sufficient that the injection hole 11 is provided so as to be openable and closable, and the opening and closing mechanism is not limited to a valve.

The condition that the washing device 10 is provided so as to move in the vertical direction is not a condition. For example, the washing device 10 may be provided so as to move in the width direction of the filter cloth.

Further, as shown in the above embodiment,
In addition to a so-called filter cloth fixed type filter press in which the cake adhered to the filter cloth 3 is dropped by applying vibration to the beating body 9, for example, a winding drum or the like for winding the filter cloth 3 below the filter cloth It may be used for a so-called filter cloth traveling type filter press in which the filter cloth is washed by spraying washing water with a fixed washing device while winding the filter cloth by the winding means.

In the case where such a traveling filter cloth filter press is used, as in the above embodiment, the cleaning device 10 is used.
It is not necessary to raise and lower the filter vertically, and the cleaning device 10 may be cleaned by spraying a cleaning liquid onto the filter cloth traveling up and down while being fixed at a predetermined position such as below the filter plate. Should be formed so as to move relatively to the filter cloth.

The type of the cleaning liquid jetted from the cleaning device 10 is not limited to the water of the present embodiment, but any type of cleaning liquid may be used as long as it can wash the filter cloth 3.

Further, in the above embodiment, the washing device provided in the filter press type electroosmotic dehydrator has been described, but it is essential that the washing device is for washing the filter cloth between the filter plates. It may be attached to a dehydrating device other than the type electroosmotic dehydrator.

Further, in the above-described embodiment, the hitting body for hitting the filter cloth hanging bar in the vertical direction is provided, but providing such a hitting body is not a condition.

In addition, the structure of the filter plate 1, the link mechanism 2, the head 7, and the like, the driving means, and the like are not limited to the above-described embodiment, and can be arbitrarily changed in design.

[0043]

Next, the case where the filter cloth is strongly washed using the washing apparatus shown in the above embodiment will be described more specifically. First, Table 1 shows the cleaning state when the filter cloth is vigorously cleaned by a cleaning apparatus provided with a total of 20 injection holes on one side as shown in the above-described embodiment, that is, 20 pairs.

A valve which can be manually opened and closed is attached to each injection hole. The washing conditions at this time were as follows: the water pressure in the hose was 50 kgf / cm ² G, and the distance between the filter cloth and the nozzle was 300 m.
m, the time for injecting the cleaning liquid is 1 minute.

Further, among the evaluations in the table, ◎ indicates that the effect as a strong washing was very large, and solids which adhered firmly to the filter cloth even after ordinary washing and could not be removed could be washed without fail. ○ indicates that solids that could not be removed by normal washing could be removed, although a small amount of solids remained, and × indicates that the state of the filter cloth did not change from that after normal washing, as strong washing. No effect was shown.

[0046]

[Table 1]

As shown in Table 1, when the number of open valves (the number of effective injection holes) is 1: 2 or 2: 4,
Solids that could not be removed by ordinary washing could be reliably washed. Also, when the number of open valves is 3 to 6, there is a certain degree of strong cleaning effect. However, when the number of open valves is 4 to 8 or more, there is only a detergency equivalent to that of normal cleaning. No effect as strong washing was obtained.

[0048]

As described above, according to the present invention, a plurality of injection holes provided in a cleaning device are formed so as to be openable and closable, and high-pressure water is injected while some of the injection holes are closed. Because it can be washed, without special high pressure washing equipment,
With a simple configuration, high-pressure cleaning can be performed economically using a cleaning device used during normal cleaning.

[Brief description of the drawings]

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

FIG. 2 is a partial side view showing a cleaning device.

3A is a front view showing the cleaning device, and FIG. 3B is a cross-sectional view taken along line XX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Filter plate 3 ... Filter cloth 10 ... Cleaning device 11 ... Injection hole 12 ... Tip part 14 ... Valve (opening / closing means)

Claims (6)

[Claims] 1. A filter cloth provided between a plurality of filter plates (1).
The method for cleaning a filter cloth in a dehydrator provided with a cleaning device (10) having a plurality of injection holes (11) for injecting a cleaning liquid to the (3) to wash the filter cloth (3). Equipment (10)
Are provided so that they can be opened and closed freely. During the strong cleaning, the cleaning liquid is sprayed onto the filter cloth (3) with some of the spray holes (11) closed. A method for cleaning a filter cloth in a dehydrator. 2. The cleaning device (10), wherein the cleaning liquid is applied to a filter cloth (3).
2. A method for cleaning a filter cloth in a dehydrator according to claim 1, wherein the filter cloth moves relative to the filter cloth when spraying the filter cloth. 3. The method for cleaning a filter cloth in a dehydrator according to claim 1, wherein the injection hole (11) of the cleaning device (10) is provided to be openable and closable by an on-off valve. 4. A filter cloth (3) is provided between a plurality of filter plates (1), and said filter plate (1) is pressed to dewater sludge in said filter cloth (3).
In a dehydrator having a dehydrator body movably provided, a washing device (10) having a plurality of injection holes (11) for injecting a washing liquid to the filter cloth (3) is provided in the dehydrator body. A dehydrator characterized in that at least some of the injection holes (11) are provided so as to be able to be closed during heavy washing. 5. The cleaning device (10) removes the cleaning solution from a filter cloth (3).
5. The dewatering machine according to claim 4, wherein the dewatering machine is provided so as to be relatively movable with respect to the filter cloth (3) when spraying on the filter cloth (3). 6. The dehydrator according to claim 4, wherein an opening / closing valve is provided at each of the injection holes (11) of the cleaning device (10).