JP2005087973A - Filter plate, dehydration drying means, and dehydration drying method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dehydration drying means which can carry out efficiently a dehydration drying treatment of a treatment object inside one equipment, and a method therefor, and a filter plate suitable for such a dehydration drying means. <P>SOLUTION: The dehydration drying means has the filter plate, which is provided with a non-conductive wall-plate, and an electrode arranged inside the wall-plate and generating electromagnetic waves, wherein, the filter plate has a filter plate arrangement arranged so as to form a filter chamber containing the treatment object, a filter fabric provided on the filter chamber side of the filter plate, a waste solution mechanism discharging a filtrate filtering out the filter fabric, and an electromagnetic wave generating mechanism generating electromagnetic waves on the electrode. Further, the dehydration drying method has a dehydration process for feeding the treatment object to the filter chamber formed by the filter plate to dehydrate, and a drying process for irradiating electromagnetic waves to the treatment object in the filter chamber to dry. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a filter plate, a dehydration drying apparatus, and a dehydration drying method used for wastewater sludge treatment, dry product production, and the like.

In wastewater treatment, a dehydrator is used for dewatering treatment of sludge and the like. In general, in wastewater treatment, impurities are first precipitated and separated from water, and the precipitated sludge is collected here, and the sludge is dehydrated using a dehydrator. Thereafter, the dewatered sludge is finally disposed of by incineration or the like. In order to efficiently perform final disposal, it is required to more efficiently dewater the sludge, that is, to reduce the moisture content of the dewatered cake.
A dehydrator is also used in the manufacture of dried products. In this case, it is required to uniformly dehydrate the material.
As a method for performing the dehydration treatment, for example, there is a method using a filter press type dehydrator. A filter press type dehydrator is provided with a filter cloth in a filter chamber surrounded by a filter plate. The filter cloth is filled with an object to be treated such as sludge and accommodated. And the to-be-processed object is squeezed, the squeezed water | moisture content is discharged | emitted out of the filtration chamber, and the to-be-processed object is spin-dry | dehydrated (for example, refer patent document 1).
However, only by performing a filter press, the water content of the dehydrated material (hereinafter referred to as dehydrated cake) is 20 to 80%, and a large amount of energy is required to directly incinerate such dehydrated cake. . Therefore, there is a method of further drying the dehydrated cake, but in that case, a drying device is separately required.
Therefore, in a filter press type dehydrator, in order to further improve the dewatering efficiency, after pressing the object to be processed, heat such as steam or hot water is given to the object to be processed through the diaphragm membrane, and drying is performed under vacuum conditions. A dehydrating and drying apparatus has been proposed (see, for example, Patent Document 2).
JP 2002-301309 A JP 2001-232109 A

However, in the invention described in Patent Document 2, the heat efficiency is low due to conduction heat, and the filter cloth is easily damaged. In addition, if the diaphragm film used is thick, the life of the diaphragm film is extended, but the thermal conductivity is lowered.If the diaphragm film is thin, the thermal conductivity is increased, but the life of the diaphragm film is shortened. It was not reached.
Moreover, unless the thickness of the to-be-processed object accommodated in the filtration chamber was made small, drying was inadequate. That is, the amount of workpieces that can be dried per unit time was insufficient.
Further, when a dehydrated cake is used as a product, the product may be deteriorated by heating for a long time.

  The present invention has been made to solve the above problems, and is suitable for a dehydration drying apparatus and method capable of efficiently performing dehydration drying treatment of an object to be processed in one apparatus, and such a dehydration drying apparatus. An object of the present invention is to provide a simple filter plate.

The filter plate of the present invention comprises a non-conductive wall plate and an electrode that is disposed in the wall plate and generates an electromagnetic wave.
The wall plate is preferably made of a resin, especially a polyolefin resin, particularly polypropylene.

The dehydrating and drying apparatus of the present invention includes a filter plate array in which the filter plate of the present invention is arranged so as to form a filter chamber that accommodates an object to be processed, and a filter provided on the filter chamber side of the filter plate. It has a cloth, a drainage mechanism that discharges the filtrate that has passed through the filter cloth, and an electromagnetic wave generation mechanism that generates an electromagnetic wave in the electrode.
The drainage mechanism preferably has a suction pump that sucks air from the filtration chamber.

  The dehydrating and drying method of the present invention includes a dehydrating step of supplying a treatment object to a filtration chamber formed by a filter plate and dehydrating, and a drying step of drying the treatment object by irradiating electromagnetic waves in the filtration chamber. It is characterized by that.

Since the filter plate of the present invention includes an electrode that generates electromagnetic waves, a dehydrating and drying apparatus that can efficiently perform a dehydrating and drying process on an object to be processed in one apparatus can be configured.
Here, when a wall plate made of a resin is used, the filter plate can be configured to be light and inexpensive. In addition, when a wall plate made of polyolefin resin is used, the thermal conductivity of the wall plate itself can be lowered, so that heat radiation from the object to be processed which has been irradiated with electromagnetic waves can be suppressed, Drying efficiency can be improved. Further, when a wall plate made of polypropylene is used, dehydration drying at higher temperature and pressure can be realized.

According to the dehydrating and drying apparatus of the present invention, it is possible to selectively heat the water contained in the object to be processed by irradiating the object to be processed with electromagnetic waves. A good dehydration drying process can be realized.
Furthermore, if a suction pump for sucking air from the filtration chamber is provided in the drainage mechanism, the dehydration drying process can be completed with a smaller amount of energy.

According to the dehydrating and drying method of the present invention, by irradiating the object to be processed with electromagnetic waves, water contained in the object to be processed can be selectively heated, so that an efficient dehydrating and drying process can be realized. Further, since dehydration and drying can be completed in one apparatus, problems such as odor are eliminated, and the working environment can be improved.
Furthermore, since uniform drying is possible and the temperature can be easily controlled, a dehydrated cake having a stable moisture content and other properties can be provided.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
<Filter plate>
FIG. 1 is a central sectional view of an example of the filter plate of the present invention.
As shown in FIG. 1, in this example, two wall plates 10 are laminated via flat electrodes 12 to form a filter plate 14. Here, the electrode 12 is provided with a connection hole 16 for connecting a conductive wire. Concave portions 17 are formed on the outer sides of the two wall plates 10, and a plate 18 is bonded to the bottom surfaces of the concave portions 17.
FIG. 2 shows a side view of the electrode 12 shown in FIG.
As shown in FIG. 2, in the electrode 12, the connection hole 16 is formed on a connection portion 22 formed in a convex shape.
FIG. 3 shows a side view of the filter plate of this example.
As shown in FIGS. 1 and 3, the electrode 12 is arranged so that the connection portion 22 having the connection hole 16 is exposed above and below the wall plate 10.
As shown in FIG. 3, a concave portion 17 is located in the center of the wall plate 10 whose side surface is formed in a substantially square shape, and the object to be treated is placed outside the filter plate 14 at one corner of the wall plate 10 at a position not related to the concave portion 17. A stock solution port 24 is provided for introduction into the recess 17. At the remaining three corners of the wall plate 10, a drainage port 26 for discharging the filtrate from the recess 17 to the outside of the filter plate 14 is provided at a position not related to the recess 17.
In the filter plate of this example, as shown in FIGS. 1 and 3, drainage grooves 20 for guiding the filtrate are formed in the plate 18 bonded to the bottom surface of the recess 17.

4 is a cross-sectional view taken along the line CC ′ of FIG.
As shown in FIGS. 3 and 4, the stock solution port 24 is provided so as to penetrate the filter plate 14, and the recess 17 side of the upper end of the stock solution port 24 is formed at the same height as the bottom surface of the recess 17. Yes.
5 is a cross-sectional view taken along the line DD of FIG.
As shown in FIG. 5, the drain port 26 is provided through the filter plate 14.
As shown in FIGS. 3 and 5, the drainage grooves 20 are formed in parallel or intersecting with each other, and the drainage grooves 20 communicate with liquid collection holes 28 provided at three corners of the recess 17. The liquid collection hole 28 communicates with a liquid collection pipe 30, and the liquid collection pipe 30 communicates with the drainage port 26.
3 and 4, the two wall plates 10 stacked via the electrode 12 are fastened to each other by fastening members 32 at the four corners of the wall plates 10.

The wall plate 10 may be any non-conductive one. However, if the wall plate 10 made of resin is used, the filter plate 14 can be configured with light weight and low cost. Examples of the resin include a polyolefin resin and a polyester resin. Among these, polyolefin resin is preferable because it has excellent moldability and does not have a polar group, so that the temperature rise of the resin itself due to electromagnetic wave irradiation is small. Examples of the polyolefin resin include polypropylene, high density polyethylene, polybutene-1, polymethylpentene, and poly-1,2-butadiene. Among these polyolefin resins, polypropylene is more preferable because of its high rigidity and high heat resistance. The shape and size of the wall plate 10 can be appropriately set according to the viscosity of the object to be processed, the processing amount, and the like, as long as a space capable of accommodating the object to be processed can be formed using the filter plate 14. There is no particular limitation.
When the wall plate 10 is non-conductive, the wall plate 10 does not absorb electromagnetic waves. Therefore, when the filter plate of the present invention is used to form a later-described filter plate array and an object to be processed is accommodated, the electrode Electromagnetic waves can be efficiently irradiated from 12 to the workpiece.

  The electrode 12 may be any electrode that can generate an electromagnetic wave by applying a high-frequency voltage, for example. Examples of the material of the electrode 12 include aluminum, iron, copper, and the like, and aluminum is preferably used from the viewpoint of workability and economy. The shape of the electrode 12 can be set according to the size and shape of the wall plate 10, the size and shape of the recess 17, and the relationship between the size of the wall plate 10 and the size of the electrode 12 is The area other than the twelve connecting portions 22 may be within the area of the wall plate 10, but when the object to be processed is accommodated as a filter plate array described later, the irradiation area as large as possible with respect to the object to be processed It is preferable to have a better drying rate.

In this example, as shown in FIG. 1, the two wall plates 10 sandwiching the electrode 12 both have the recesses 17, but only one wall plate 10 has the recesses 17 and the plates provided thereon. The form which has 18 and the drainage groove 20 may be sufficient.
Further, the arrangement of the stock solution port 24 may not be one corner of the wall plate 10, as long as the object to be processed can be introduced from the outside of the filter plate 14 into the recess 17. The arrangement of the drain port 26 is not limited to the three corners of the wall plate 10 as long as the filtrate can be discharged from the recess 17 to the outside of the filter plate 14. The drainage groove 20 is not limited to the groove type, and it is sufficient that the filtrate can be guided from the recess 17 to the drainage port 26. For example, the drain groove 20, the liquid collection hole 28, and the liquid collection pipe 30 are replaced with a hole provided through the plate 18 and the one wall plate 10 on the bottom surface of the recess 17 and a pipe following the hole. be able to.

<Dehydration drying device>
The dehydrating and drying apparatus of the present invention can be configured using the filter plate of the present invention.
6-8 shows sectional views of an example of the dehydration drying apparatus of the present invention. The dehydrating and drying apparatus of this example is constructed by installing filter cloths on both sides of the filter plate 14 shown in FIG. 1 and assembling two or more filter plates 14 on which the filter cloths are laminated, as shown in FIGS. These are schematic sectional views corresponding to the BB line and the AA line in FIG. 3, respectively. FIG. 8 is a schematic sectional view corresponding to the line CC′-C ″ in FIG.
In this example, as shown in FIG. 6, filter cloths 40 are installed on both sides of the filter plate 14, and a plurality of filter plates 14 provided with the filter cloth 40 are arranged with the recesses 17 facing each other. Thus, a filter plate array 42 is formed. Here, these filter plates 14 form a filtration chamber 44 that is isolated from the outside and accommodates an object to be processed by the recesses 17 of the respective filter plates 14 communicating with each other.
That is, the filter plate 14 is arranged so as to form a filter chamber 44 that accommodates an object to be processed to form a filter plate array 42, and the filter cloth 40 is installed on the filter chamber 44 side.
6 and 7, the filter plate array 42 is shown as a configuration composed of a pair of filter plates 14, but the filter plate array 42 in this example is actually 3 as shown in FIG. 8. The above filter plates 14 are arranged.

In this example, a drainage mechanism for discharging the filtrate that has passed through the filter cloth 40 is provided. As shown in FIGS. 3 and 7, the drainage mechanism includes a drainage groove 20, a liquid collection hole 28, a liquid collection pipe 30 that communicates with the liquid collection hole 28, and a drainage connected to the liquid collection pipe 30. A liquid port 26.
Further, in the dehydrating and drying apparatus of this example, the filter plate array 42 is placed at positions corresponding to the three corners of each filter plate 14 by connecting the drain ports 26 to each other in the filter plate array 42. A discharge path (not shown) is formed through which the filtrate is discharged from the filtration chamber 44 to the outside of the dehydration drying apparatus.
Further, in the drainage mechanism, as shown in FIG. 8, a suction pump 110 that sucks air from the filtration chamber 44 is connected to the outermost end portion of the fluid drainage port 26 communicated. By operating the suction pump 110, the inside of the filtration chamber 44 can be decompressed by sucking air from the filtration chamber 44.

In the dehydrating and drying apparatus of this example, as shown in FIG. 8, in the filter plate array 42, when the stock solution ports 24 communicate with each other, the filter plates are located at positions corresponding to one corner of each filter plate 14. An introduction path 46 for the object to be processed is formed through the array body 42. That is, each filtration chamber 44 is electrically connected via the introduction path 46 for the workpiece.
Furthermore, in this example, as a mechanism for supplying the object to be processed to the filtration chamber 44, an introduction pipe 100 communicating from the outside of the dehydration drying apparatus to the stock solution port 24 of the outermost filter plate 14 constituting the filter plate array 42, A pressurizing pump 102 attached to the introduction pipe 100 is provided.

  Furthermore, as an electromagnetic wave generating mechanism for generating an electromagnetic wave in the electrode 12, a high frequency generator 108 is connected to the connection hole 16 of the electrode 12 through a lead as shown in FIG.

As a material of the filter cloth 40, any material having no polarity may be used. Since polar materials such as metals reflect electromagnetic waves, the energy of electromagnetic waves reaching the object to be processed is reduced, the drying efficiency of the object to be processed is reduced, and sparks are generated. . The roughness of the filter cloth 40 (the size of the solid that can pass through the filter cloth) is selected and used according to the size of the solid contained in the object to be processed, the purity of the dehydrated cake required, and the like. be able to.
In the filter plate array 42 in this example, as shown in FIG. 6, the two wall plates 10 sandwiching the electrode 12 both use the filter plates 14 having the recesses 17, and the three filter plates 14 are two. Although the two filtration chambers 44 are formed, for example, only one of the wall plates may use a filtration plate having a recess, and a unit in which two filtration plates form one filtration chamber may be repeated.
In this example, the thickness and volume of the filtration chamber 44 can be arbitrarily set by setting the depth of the recess 23. For example, what is necessary is just to set according to the drying speed of the desired to-be-processed object, the quantity of the to-be-processed object to dry.

  In the suction pump 110, a filtrate discharge mechanism that sucks and discharges the filtrate from the filtration chamber 44 can be further provided. In this case, the suction pump 110 needs to be provided with a mechanism for switching between the filtrate discharge mechanism and the mechanism for sucking air.

The electromagnetic wave generation mechanism for generating an electromagnetic wave in the electrode 12 can be appropriately set according to the material of the electrode to be used and the frequency of the electromagnetic wave to be generated.
For example, when the object is to be dried to such an extent that it can be easily incinerated, an electromagnetic wave (high frequency) having a frequency of 1 MHz to 1 GHz is generated on the electrode 12 and processed by the dehydration drying apparatus of the present invention. When the object to be processed is intended to be provided as a dry product as it is, it is preferable to set the electromagnetic wave generation mechanism so as to generate an electromagnetic wave (microwave) having a frequency of 1 GHz to 300 GHz. In the case of generating microwaves, it is necessary to cover the entire dehydrating and drying apparatus with a shield.

<Dehydration drying method>
Hereinafter, a preferable example of the dehydration drying method of the present invention will be described.
9 and 10 are process diagrams showing a method using the dehydrating and drying apparatus shown in FIGS. 6 to 8 as an example of the dehydrating and drying method of the present invention.
First, a dehydration process is performed in which an object to be processed is supplied to a filtration chamber formed by a filter plate to dehydrate.
9 and 10, the arrows in the drawings indicate the movement direction of the workpiece introduced from the introduction pipe 100 or the movement direction of the filtrate from the liquid collection pipe 30 to the drain port 26.
By closing the stock solution port 24 of one of the outermost filter plates 14 constituting the filter plate array 42 and operating the pressure pump 102 connected to the other inlet tube 100, FIG. As shown in FIG. 3, the object to be processed is introduced from the outside of the dehydrating / drying apparatus into the introduction path 46 of the object to be processed. As a result, the object to be processed is transferred from the introduction pipe 100 to each filtration chamber 44 via the introduction path 46 of the object to be processed. That is, the workpiece 106 is supplied to the filtration chamber 44 formed by the filtration plate 14.
As shown in FIG. 9, the pressurizing pump 102 is operated until all the filtration chambers 44 of the dehydration drying apparatus, the workpiece introduction passages 46, and the introduction pipes 100 are filled with the workpieces 106.

Subsequently, the operation of the pressurizing pump 102 is continued. Thus, the workpiece 106 is continuously supplied to the filtration chamber 44 formed by the filter plate 14.
When the operation of the pressurizing pump 102 is further continued, the workpiece 106 is pressurized in the filtration chamber 44 and pressed against the concave portion 17 of the filter plate 14 through the filter cloth 40. At this time, the solid content contained in the workpiece 106 does not permeate the filter cloth 40, so that the solid content remains in the filtration chamber 44. On the other hand, moisture contained in the workpiece 106 passes through the filter cloth 40 from the filtration chamber 44 to become a filtrate, and this filtrate moves to the drainage groove 20. Therefore, the workpiece 106 is dehydrated by continuing the operation of the pressure pump.
The filtrate that has permeated through the filter cloth 40 reaches the liquid collection hole 28 through the drainage groove 20, moves from the liquid collection hole 28 to the liquid collection pipe 30, and then passes through the liquid discharge port 26 shown in FIG. 7. And discharged to the outside of the dehydration drying device.
When the speed at which the filtrate is discharged from the drainage port 26 decreases to about 1 g / min, the operation of the pressurization pump is stopped and the stock solution port 24 on the side to which the pressurization pump 102 is connected is closed.

Next, a drying process is performed in which the object to be processed is irradiated with an electromagnetic wave in the filtration chamber for drying.
As shown in FIG. 10- (a), the two stock solution ports 24 located on the outermost side of the filter plate array 42 are once opened, and air is blown from one of these stock solution ports 24, so that The workpiece 106 filled in the introduction path 46 is discharged from the other stock solution port 24, and the introduction path 46 of the workpiece is emptied. As a result, when the suction pump 110 is operated as will be described later, it is possible to prevent a reduction in suction efficiency due to the surplus workpieces remaining.
By operating the suction pump 110 on the vacuum suction side, the pressure in the filtration chamber 44 is reduced. At the same time, the high frequency generator 108 is operated so that the electrodes 12 are alternately positive and negative in the arrangement order, and electromagnetic waves are generated from the electrodes 12, so that electromagnetic waves are applied to the object 106 filled in the filtration chamber 44. Irradiate. By irradiating the electromagnetic wave in this way, only the water remaining on the object to be processed 106 is heated and evaporated, so that the object to be processed 106 is dried.
In this example, by operating the suction pump 110, the inside of the filtration chamber 44 is maintained in a reduced-pressure atmosphere of, for example, about 0.02 MPa, so that the temperature is lower than atmospheric pressure, that is, with a smaller amount of energy. Water evaporates.

After the operation of the high-frequency generator 108 is stopped, as shown in FIG. 10- (b), the object 106 (dehydrated cake) that has been dehydrated and dried is dropped by widening the interval between adjacent filter plates 14. And collect.
Furthermore, by subjecting the recovered dehydrated cake to incineration or processing / packaging, it is possible to complete the disposal of the object to be processed or the production of a dry product made from the object to be processed.

The material to be processed that can be dehydrated and dried by the dehydration drying method of the present invention may be anything that has fluidity. For example, wastewater sludge, dyes, pigments and the like in the food industry and the like are mentioned.
In the dehydration step, the suction pump 110 shown in FIG. 8 is switched to the filtrate discharge mechanism and operated, so that the filtrate that has passed through the filter cloth 40 and reaches the recess 17 is discharged from the drain port 26 to the outside of the dehydration drying apparatus. It may be sucked and discharged.
In this example, no diaphragm is used in the dehydration step, but a known pressing method using a diaphragm may be used. Further, a diaphragm may be used, and suction may be performed from the drain port side with a suction pump, and the outside of the filter cloth may be in a reduced pressure atmosphere.
In this example, in the drying process, the piping on the stock solution port side is once cleaned by air blowing, and then the stock solution port is closed and sucked by the suction pump. However, if the suction pump is not used, air blow is unnecessary. is there.
In the drying process, when the pressure in the filtration chamber 44 is reduced using the suction pump 110 as in this example, it is preferable to operate the suction pump 110 simultaneously with the operation of the high-frequency generator 108. However, the high frequency generator 108 may be operated after the suction pump 110 is operated and the inside of the filtration chamber 44 is evacuated.

In the drying step of the present invention, it is preferable to adjust the frequency of the electromagnetic wave generated at the electrode 12 according to the type of the object to be processed, the intended degree of drying, the use of the dehydrated cake, and the like. For example, in the case where the object is to be dried to such an extent that it can be easily incinerated, an electromagnetic wave (high frequency) with a frequency of 1 MHz to 1 GHz is generated, while the dehydrated cake is provided as a dry product as it is. For this purpose, electromagnetic waves (microwaves) having a frequency of 1 GHz to 300 GHz can be used. When microwaves are used, water can be heated particularly selectively, which is preferable in terms of maintaining the quality of the dehydrated cake and increasing the drying efficiency by shortening the heating time. When microwaves are used, it is necessary to cover the entire dehydrating and drying apparatus with a shield.
By controlling the frequency, irradiation time, and the like of the electromagnetic wave generated on the electrode 12, temperature control can be performed on the heating temperature of the object to be processed.

In this example, the drying process is performed after the dehydration process. However, in the dehydration drying method of the present invention, the dehydration process and the drying process may be performed simultaneously.
The processing time for dehydrating and drying the object to be processed, that is, the time for performing the dehydration step and the time for performing the drying step can be set as appropriate. For example, by performing the dehydration step for 1 hour and performing the drying step for 1 hour, A dehydrated cake having a large thickness that cannot be satisfactorily dehydrated and dried can be processed. Moreover, when the dehydration process and the drying process are completed for a processed material having the same amount as that of the conventional dehydration method over a processing time similar to that of the conventional method, the moisture content of the processed material is close to 0%. You can also

According to the dehydrating and drying method of this example, the water in the workpiece 106 is dehydrated by the filling pressure and evaporated by being selectively heated by electromagnetic wave irradiation. Good dehydration and drying can be performed.
Furthermore, since the moisture is evaporated at a lower temperature by setting the inside of the filtration chamber 44 to a reduced-pressure atmosphere in the drying process, more efficient dehydration drying is realized.

As described above, since the filter plate of the present invention includes an electrode that generates electromagnetic waves, a dehydrating and drying apparatus that can efficiently perform a dehydrating and drying process on an object to be processed can be configured.
Here, if the wall board which consists of polyolefin resin is used, the heat radiation from the to-be-processed object which received irradiation of electromagnetic waves to a wall board can be suppressed, and also drying efficiency can be improved. Furthermore, when a wall plate made of polypropylene is used, dehydration drying treatment at higher temperature and higher pressure can be realized.
Furthermore, the filter plate of the present invention can be installed in an existing dehydrator without significant modification, and has been used in the past because it can complete the drying of an object to be processed in one apparatus. Drying equipment and a drying process can be omitted, and significant rationalization can be realized.

According to the dehydrating and drying apparatus of the present invention, it is possible to selectively heat the water contained in the object to be processed by irradiating the object to be processed with electromagnetic waves, so that an efficient dehydrating and drying process can be realized.
In the dehydrating and drying apparatus of the present invention, since the heating is performed by electromagnetic waves, the workpiece can be heated even in a vacuum. Therefore, by performing vacuum suction simultaneously with heating by electromagnetic wave irradiation, it is possible to perform drying while further reducing energy required for drying.

According to the dehydrating and drying method of the present invention, by irradiating the object to be processed with electromagnetic waves, water contained in the object to be processed can be selectively heated, so that an efficient dehydrating and drying process can be realized. Further, since the dehydration process and the drying process can be completed in the same machine, problems such as odor are eliminated, and the working environment can be improved.
Furthermore, since uniform drying is possible and the temperature can be easily controlled, a dehydrated cake having a stable moisture content and other properties can be provided.
The dehydration drying method of the present invention can be applied to any dehydration method such as a compression method, a filter press method, a single method, and a double method.

  The filter plate, dehydration drying apparatus, and dehydration drying method of the present invention are for wastewater treatment, construction sludge in the construction industry, livestock manure in the livestock industry, food processing wastewater or sludge in the food processing industry, and waterworks sludge in water and sewage treatment facilities. , Sewage surplus / digested sludge, human waste sludge, wastewater containing organic chemicals in the chemical industry, processing wastewater in the textile industry, surplus sludge, recovered wastewater in the pharmaceutical manufacturing line, construction sludge in the industrial waste treatment industry, animal and plant residues, livestock Suitable for treatment of manure, surplus sludge / wastewater, wastewater containing ink manufacturing treatment in the ink / pigment manufacturing industry, wastewater containing inorganic chemicals such as pigment sludge, aluminum in the metal oxidation processing industry, and papermaking sludge in the papermaking industry .

The filter plate, dehydration drying apparatus, and dehydration drying method of the present invention can also be used in the production of dried products. For example, it is suitable for the manufacture of chemicals, papermaking, dyes and pigments.
Furthermore, it can be used for applications such as sterilization by temperature control.

It is a center sectional view in an example of a filter board of the present invention. It is a side view which shows an example of the electrode used for the filter plate of this invention. It is a side view which shows an example of the filter plate of this invention. FIG. 4 is a sectional view taken along line C-C ′ of FIG. 3. It is the DD sectional view taken on the line of FIG. It is sectional drawing equivalent to the BB line of FIG. 3 in an example of the dehydration drying apparatus of this invention. It is sectional drawing equivalent to the AA line of FIG. 3 in an example of the dehydration drying apparatus of this invention. FIG. 4 is a cross-sectional view corresponding to the line C-C′-C ″ of FIG. 3 in an example of the dehydrating and drying apparatus of the present invention. It is process drawing which shows the example of the dehydration process in the dehydration drying method of this invention. It is process drawing which shows the example of the drying process in the spin-drying | dehydration method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Wall plate 12 Electrode 14 Filter plate 24 Raw liquid port 26 Drain port 40 Filter cloth 42 Filter plate array 44 Filtration chamber 106 Processed object 108 High frequency generator 110 Suction pump

Claims (8)

  A filter plate comprising: a non-conductive wall plate; and an electrode disposed in the wall plate and generating an electromagnetic wave.   The said wall board consists of resin, The filter board of Claim 1 characterized by the above-mentioned.   The filter plate according to claim 2, wherein the wall plate is made of a polyolefin resin.   The filter plate according to claim 3, wherein the wall plate is made of polypropylene.   A filter plate according to any one of claims 1 to 4, wherein the filter plate is arranged so as to form a filter chamber for containing an object to be processed, and a filter provided on the filter chamber side of the filter plate. A dehydrating and drying apparatus comprising: a cloth; a drainage mechanism that discharges the filtrate that has passed through the filter cloth; and an electromagnetic wave generation mechanism that generates an electromagnetic wave in the electrode.   6. The dehydrating and drying apparatus according to claim 5, wherein the drainage mechanism includes a suction pump that sucks air from the filtration chamber.   A dehydration method comprising: a dehydration step of supplying a treatment object to a filtration chamber formed by a filter plate and dehydrating; and a drying step of irradiating the treatment object with electromagnetic waves to dry the treatment object in the filtration chamber. . The dehydration drying method according to claim 7, wherein in the drying step, the pressure in the filtration chamber is reduced.

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