JP3800408B2 - Concentrator, continuous pressure dehydrator using a concentrator, and mobile dehydrator - Google Patents

Description

[0001]
[Industrial application fields]
The present invention provides a concentrator that concentrates and reduces a large amount of sewage sludge or purified water sludge, a dehydrator that further dehydrates the concentrated sludge, a continuous pressure dehydrator that saves labor, and a continuous pressurization. The present invention relates to a mobile dewatering vehicle loaded with a dehydrator.
[0002]
[Prior art]
Conventionally, as a dehydrator that dehydrates a large amount of difficult-to-filter organic sludge such as sewage sludge in large cities or inorganic sludge such as purified water sludge, a continuous dehydrator with a larger throughput than batch type has been used. The greater the amount, the greater the importance of power saving. Examples of continuous dehydrators that have been put to practical use include screw presses, belt presses, decanter-type centrifugal dehydrators, and drum rotary vacuum dehydrators. As a dewatering device for difficult-to-filter organic sludge such as sewage sludge, it is possible to save power, and the screw press is one of the simplest dewatering machines that does not use waste filter cloth. No. 06-13159). Further, as a dewatering device for purified water sludge, there is a problem of screw blade wear in a screw press or a centrifugal dewatering machine, and a batch type filter press is employed (for example, JP-A-2001-224910). As a device for dewatering a small amount of sludge generated from a dispersed small-scale sewage treatment plant or the like, a mobile dewatering vehicle loaded with a belt press is used (for example, JP-A-60-41599).
[0003]
[Problems to be solved by the invention]
The screw press has low power because of its low-speed rotation, and the filter medium has relatively large eyes, so there is less clogging, and there is an advantage that the amount of washing water of the filter medium is significantly less than the belt press, but the filtration surface of the screw press is This is single-sided filtration of the outer cylinder, and the occupied space for securing the necessary filtration area increases. In the case of purified water sludge in which sludge contains a large amount of inorganic substances, there is a drawback that back pressure is applied to the discharge port, and the screw blades are worn and dewatering performance is lowered. The filter press enables large-capacity processing, but it takes a long time due to intermittent dehydration, and requires a large installation space. In addition, a mobile dewatering vehicle loaded with a belt press dehydrator also requires a concentrating device, a cake hopper, and a pumping device for discharged cake, which increases the load weight and space, and also increases the mobile dewatering vehicle. The present invention comprises a concentrator for concentrating and reducing sludge with a low concentration, a screw press that depressurizes and concentrates the concentrated sludge into a half cake and acts as an indenter, and a cake depressurized and dehydrated into a half cake. Provided are a continuous squeezing dehydrator combined with a squeezing dehydrator for squeezing and dewatering by a shearing action and a compacting action, and a mobile dehydrator loaded with the continuous squeezing dehydrator.
[0004]
[Means for Solving the Problems]
The present invention solves the conventional problems, and the gist of the concentrator of the first invention is that a feed shaft with screw blades is suspended inside a standing filter tube, and the filter tube and the feed tube are suspended. The shaft is rotatably arranged, the filter tube is installed in the filter tube, and the sludge supply path provided on the feed shaft is opened above the filter tube, and the lower end of the filter tube is placed horizontally. Even if the sludge has a low concentration, the filtrate is separated by gravity in the vertical position and the conveying pressure of the screw blades, and the screw blades regenerate the filter medium surface. Therefore, a large amount of sludge can be processed. Since the sludge concentration is low, there is no wear on the screw blades.
[0005]
The gist of the continuous pressure dehydrator using the concentrator of the first invention is that a feed shaft around which a screw blade is wound is suspended inside a standing filter tube, and the filter tube and the feed shaft are freely rotatable. The sludge supply path provided on the feed shaft is opened at the top of the filtration cylinder, the lower end of the filtration cylinder is communicated with the start end of the dehydration cylinder of the screw press, and the rear end of the dehydration cylinder is While connecting with a curved tubular press-fitting pipe, a pressing cylinder connected to the rear end of this press-fitting pipe is suspended, an inner cylinder is disposed inside the pressing cylinder to form a pressing chamber, and further, the upper end of the pressing cylinder A curved back pressure pipe is connected to the section, and a back pressure adjusting plate is disposed at the rear end of the back pressure pipe. The concentrated sludge reduced in the concentrator is added to the half cake by a screw press. Press and dehydrate to act as an indenter, press and compress with shear and compaction by a press dehydrator without screw blades And performs water mass treatment of high compression and sludge cake is possible, the simplification and laborsaving of the dewatering device can be achieved device.
[0006]
Along with the continuous pressure dehydrator of the first invention, in order to regenerate the filter medium surface of the filter cylinder, a filter cylinder washing tube provided for a rotatable filter cylinder and a screw press dewatering cylinder were provided. A dewatering cylinder cleaning pipe and a pressing cylinder cleaning pipe that revolves the outer peripheral surface of the pressing cylinder are provided, and clogging of the filter medium surface can be eliminated by spraying the cleaning water. Further, if a heating fluid supply pipe is connected to an inner cylinder provided in the squeezing cylinder to form a heating chamber, the evaporation of the cake moisture and the sludge properties can be changed to improve the dehydration property. And if a suction chamber is provided in the outer peripheral part of a pressing cylinder and a dehydration chamber is attracted | sucked, the cake of a compression chamber will be attracted | sucked and dehydrating property will become good. At the same time, if a cake heating device is provided in the inner cylinder, the boiling point decreases due to the reduced pressure, and the moisture in the cake in the low temperature heating state is evaporated. If a filter medium is stretched on the inner cylinder and a rotatable inner cylinder cleaning pipe is provided on the inner peripheral surface of the inner cylinder, double-side filtration with a dehydrating cylinder becomes possible, and the amount of sludge treatment increases.
[0007]
In the invention using the second continuous pressure dehydrator, in order to make the continuous pressure dehydrator compact, the above-described standing concentrator is connected to the start end of the dehydration cylinder of the screw press, and the Continuous squeeze dehydrator constructed by squeezing dehydrator at the outlet at the end, service tank for storing sludge, chemical dissolution device for dissolving flocculant, and stirring and mixing sludge and flocculant continuously It may be a mobile dewatering vehicle in which a flocculant admixing tank for supplying mud to a pressure dehydrator is loaded on a vehicle, and sludge generated from a plurality of water purification plants or sewage treatment plants can be treated.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The apparatus according to the present invention is configured as described above, and sludge is press-fitted from the feed shaft supply port toward the filtration cylinder, and is filtered from the filtration surface of the filtration cylinder by the conveying pressure of the screw blades and gravity in a vertical posture. The liquid is separated and the sludge is transferred while being concentrated. The sludge is concentrated in a compacted state and discharged to the start end of the screw press dewatering cylinder. The solid matter trapped in the filter cylinder is scraped off by a screw blade to regenerate the filter medium surface. In addition, since sludge is supplied between screw blades, it does not break agglomerated floc. When the filtration performance of the filter cylinder is deteriorated, the filter cylinder can be regenerated by washing off the clogged material on the filter medium surface by appropriately spraying washing water from the filter cylinder washing pipe while rotating the filter cylinder.
[0009]
The concentrated sludge reduced in the concentrator is separated from the filtration surface of the dewatering cylinder by the back pressure due to gravity from the dewatering cylinder and the conveying force of the screw blades in the dehydration chamber of the screw press. The tip of the screw blade slides on the filtration surface of the dewatering cylinder on which the cake layer is formed by solid-liquid separation, and the cake layer is scraped to regenerate the filter material surface. The sludge is consolidated into a cake and transferred to the press-fitting pipe of the press dehydrator. The combination of the concentrator and the screw press makes it possible to process a large amount of sludge, and the screw press acts as an indenter to enable the high pressure squeezing and dehydration of the squeezing dehydrator. When the filterability of the dewatering cylinder is deteriorated, the dewatering cylinder can be regenerated by appropriately spraying the washing water from the dewatering cylinder washing water pipe.
[0010]
The soft cake extruded into the press-fitting pipe of the press dehydrator is bent and moved inside the curved press-fit pipe while supporting the cake of the press cylinder suspended in the press-fit pipe with bending resistance, giving the cake a shearing action, Make it easy to separate the moisture in the cake. The cake that has flowed into the lower end of the dewatering cylinder separates the filtrate while being subjected to the compaction action due to the frictional resistance between gravity and the filtration surface in the dewatering chamber of the suspended dewatering cylinder, and squeezes and dehydrates the cake. Since the squeezing process in which wear occurs is performed with a squeezing cylinder without screw blades, the wear of screw blades is also reduced. When the filterability of the compression cylinder has deteriorated, if the sludge injection is stopped or the dehydration operation is performed, the washing cylinder is rotated along the expression cylinder and the washing water is sprayed, so that the filtration surface of the expression cylinder Clogging can be eliminated.
[0011]
The cake that has risen to the upper part of the pressing cylinder is consolidated and dehydrated by the back pressure by the back pressure adjusting plate of the back pressure pipe connected to the upper end of the pressing cylinder and the conveying pressure of the screw press. Extruded. The cake is subjected to a shearing action in a curved shape with a back pressure pipe, and the variation in moisture content is made uniform. The cake is discharged from the discharge port while receiving the back pressure of the back pressure adjusting plate, and becomes a cake that has been pressed and highly dehydrated.
[0012]
If heating fluid is supplied from the inner cylinder of the pressing cylinder and heated from the inside of the cake to be transferred, the properties of the organic matter are changed to improve dehydration, and moisture is evaporated to reduce the weight and increase the temperature for composting. Heat sterilization and moisture adjustment can be performed. Also, if the moisture in the cake is vacuum-suctioned from the suction chamber around the periphery of the pressing cylinder, the moisture in the cake is separated, the cake is dried at a temperature with a low melting point, and a high pressure is applied using a screw press as an indenter. Squeeze and push. Less heat loss due to low temperature drying. If a rotatable inner cylinder cleaning tube is provided on the inner cylinder on which the filter medium is stretched, clogging of the filtration surface of the inner cylinder can be eliminated.
[0013]
If a continuous squeezing dehydrator is loaded on the vehicle as a mobile dehydrator, the continuous squeezing dehydrator becomes capable of high-pressure squeezing of cakes and a large amount of sludge treatment, making it possible to simplify the dehydration device and save labor. Compared to a mobile dewatering vehicle loaded with a belt press, the device can be simplified and labor-saving, resulting in a compact mobile dewatering vehicle with a small vehicle weight and space.
[0014]
【Example】
An embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a continuous press dehydrator provided with a concentrator and a screw press as an indenter, and the continuous press dehydrator 1 is installed upright to concentrate sludge. The concentrated concentrator 2, the screw press 3 disposed horizontally to dehydrate the concentrated sludge and act as an indenter, and the squeezing and dewatering machine 4 provided to squeeze the dehydrated cake further. The concentrator 2 is connected to the starting end 5 a of the dehydrating cylinder 5 of the screw press 3 via an elbow-shaped connecting pipe 6, and the rear end 5 b of the dehydrating cylinder 5 is an elbow-shaped press-fitting pipe 7 of the pressing dehydrator 4. Is connected to. FIG. 2 is an enlarged view of the concentrator, in which a cylindrical filter cylinder 8 having a filtration surface of the concentrator 2 is suspended from a frame 9 and slid on a support flange 10 fixed to the frame 9 at its lower end. It touches. The filter cylinder 8 is connected to a filter cylinder drive 11 and is erected in a rotatable manner. A cylindrical feed shaft 13 around which screw blades 12 are wound is disposed inside the filtration cylinder 8, and a concentric cylindrical filtration chamber 14 is formed vertically between the filtration cylinder 8 and the feed shaft 13. It is. The feed shaft 13 is rotatably suspended at the upper end of the filter cylinder 8 and is interlocked with the screw driver 15.
[0015]
As shown in FIG. 2, a sludge supply path 16 is provided on the suspended feed shaft 13, and a supply port 16 a of the supply path 16 is opened at the upper end of the filtration chamber 14. The sludge press-fitted into the filtration chamber 14 is applied with the conveying pressure of the screw blades 12 and the gravity of sludge in a vertical posture, and a large amount of filtrate is discharged from the filtration cylinder 8 even with low-concentration sludge. Since the concentrator 2 provided with the sludge supply path 16 on the feed shaft 13 is supplied from between the screw blades 12, the flocs in the sludge are not affected by the rotation of the screw blades 12, and the dehydrating property is reduced. It will not be damaged. Since the rotating screw blade 12 is brought into sliding contact with the filter cylinder 8 and scrapes the cake layer to constantly regenerate the filter medium surface to promote filtrate discharge, the low-concentration and large-capacity sludge is concentrated and reduced in volume. The sludge transferred to the discharge port 17 at the lower end of the filtration chamber 14 is concentrated in a compacted state, and is transferred from the connecting pipe 6 to the dehydration chamber 25 of the screw press 3 by the conveying pressure of the screw blades 12 and the sludge weight in the vertical posture of the filter cylinder 8. Transfer concentrated sludge.
[0016]
As shown in FIG. 2, a filter cylinder cleaning pipe 18 is provided opposite to the outer peripheral surface of the filter cylinder 8, and when the filterability of the filter cylinder 8 deteriorates or every predetermined time, the filter cylinder Washing water is appropriately jetted from the filter cylinder washing tube 18 while rotating the nozzle 8. Cleaning of the filter cylinder 8 can be carried out while performing a filtration operation. The filtration operation of the concentrating device 2 may rotate the filtration cylinder 8 when washing the filtration cylinder 8, but during the filtration operation, the filtration cylinder 8 and the feed shaft 13 are rotated in opposite directions or in the same direction. It may be rotated. If the screw blade 12 is rotated in the opposite direction of the filtration cylinder 8 during the filtration operation, the number of times of sliding contact with the filter medium surface of the screw blade 12 is increased, and the conveying pressure of the screw blade 12 is also increased, and the amount of sludge processed is increased. Will increase.
[0017]
FIG. 3 shows a screw press connected to a concentrator, in which a support flange 10 of a filter cylinder 8 of the concentrator 2 is connected to a connecting pipe 6 connected to a dehydrating cylinder 5 of the screw press 3. The screw press 3 disposed horizontally is supported on the front and rear frames 19 and 20, and a dehydrating cylinder 5 having a filtration surface of the screw press 3 is rotatably disposed. When the dehydrating cylinder drive unit 21 is linked to the dehydrating cylinder 5 and the filtration surface of the dehydrating cylinder 5 is clogged, cleaning water is supplied from the dehydrating cylinder cleaning pipe 22 provided on the outer periphery while rotating the dehydrating cylinder 5. The filter medium surface of the dewatering cylinder 5 is washed by spraying. A feed shaft 24 around which the screw blades 23 are wound around the dewatering cylinder 5 is provided, and a dewatering chamber 25 is formed between the dewatering cylinder 5 and the feed shaft 24. The diameter of the feed shaft 24 is increased in a tapered manner from the start end side toward the end end side, and the interval between the dewatering cylinder 5 and the feed shaft 24 is relatively reduced in the extending direction. A starting end side of the feed shaft 24 provided in the dewatering cylinder 5 is projected from the connecting pipe 6, and a tip end portion thereof is interlocked and connected to the feed shaft driver 54.
[0018]
The concentrated sludge transferred from the concentrator 2 separates the filtrate from the filtration surface of the dewatering cylinder 5 by the conveying pressure of the screw blades 23, and the solid matter trapped on the filtration surface is scraped off by the screw blades 23. Regenerate the filtration surface. The concentrated sludge transferred toward the end of the dehydration chamber 25 is dehydrated and becomes a soft cake.
[0019]
FIG. 4 shows a press dehydrator, in which a guide tube 27 is provided concentrically inside the press-fit pipe 7 of the press dehydrator 4, and a feed shaft 26 of the screw press 3 is provided at the tip of the guide tube 27. It is connected. The soft cake dehydrated by the screw press 3 is pumped to the press-fitting pipe 7 of the press dehydrator 4 by the conveying pressure of the screw blade 23. A pressing cylinder 28 having a filtration surface is suspended from the rear end of the press-fitting pipe 7, and an inner cylinder 29 is concentrically disposed inside the pressing cylinder 28. A pressing chamber 30 is formed between the pressing tube 28 and the inner tube 29, and the inner tube 29 is connected to the guide tube 27 of the press-fitting tube 7. The soft cake pumped from the dehydration chamber 25 of the screw press 3 to the press-fitting pipe 7 supports the cake in the vertical posture of the pressing cylinder 28 by the bending resistance of the curved pipe portion, and applies a shearing action while moving the cake in a curved manner. The cake that has moved to the lower end of the compression chamber 30 of the compression cylinder 28 separates the filtrate from the filtration surface of the compression cylinder 28 while being subjected to a compaction action due to frictional resistance between the weight of the cake and the filtration surface in the vertical compression chamber 30. Then, the moisture content in the cake is reduced and the pressure is dehydrated.
[0020]
As shown in FIG. 4, when the squeezing cylinder cleaning pipe 32 interlocked with the cleaning pipe driver 31 is provided on the squeezing cylinder 28, the filtration surface of the squeezing cylinder 28 is clogged and the filterability is deteriorated. In addition, the sludge injection into the concentrator 2 is stopped, or the squeezing tube washing tube 32 is revolved along the squeezing tube 28 while continuously performing the squeezing and dewatering operation. To eliminate clogging. A curved back pressure pipe 33 having a hollow inside is connected to the upper end of the compression cylinder 28, and a back pressure adjusting plate 35 for opening and closing the discharge port 33a by the air cylinder 34 is disposed on the rear end side of the back pressure pipe 33. It is. The cake rising from the squeezing chamber 30 of the squeezing cylinder 28 gives a shearing action to the curved tube by the hollow back pressure pipe 33 while applying back pressure by the back pressure adjusting plate 35 at the rear end, and the moisture content in the cake varies. And the cake is discharged from the discharge port 33a.
[0021]
FIG. 5 shows another embodiment of a pressing cylinder provided with a heating device, in which a supply pipe 36 for heating fluid such as steam or hot air is connected to an inner cylinder 29 of the pressing cylinder 28, and the inside of the inner cylinder 29. Is provided with a heating chamber 37. The cake in the pressing chamber 30 is heated from the inner periphery of the inner cylinder 29 to evaporate the moisture, thereby reducing the moisture content of the cake, and changing the properties of the hardly filterable organic matter to improve the dehydrating property. The heated hot water and waste heat are discharged from the drain 38 connected to the lower end of the inner cylinder 29. FIG. 6 shows another embodiment of a pressing cylinder provided with a vacuum suction device, in which a suction chamber 39 is provided on the outer periphery of the pressing cylinder 28, and a suction tube 40 connected to a vacuum source is connected to the suction chamber 39. Then, moisture in the cake of the compression chamber 30 is sucked from the suction chamber 39. Similarly to the heating device shown in FIG. 5, if the heating chamber 37 is provided inside the inner cylinder 29, the cake in the pressing chamber 30 is heated from the inside of the inner cylinder 29 while the cake is being heated from the outside of the pressing cylinder 28. Can be vacuum-sucked. The boiling point is lowered by reducing the pressure in the compression chamber 30, and the moisture in the cake can be evaporated in a low temperature state. Heat loss due to low-temperature drying is reduced, improving drying efficiency and reducing running costs.
[0022]
FIG. 7 shows another embodiment of the dewatering cylinder provided with a cleaning device, in which a filter medium is stretched between the pressing cylinder 28 and the inner cylinder 29, and the outer peripheral surface of the pressing cylinder 28 and the inner peripheral surface of the inner cylinder 29. The squeezing cylinder cleaning pipe 32 and the inner cylinder cleaning pipe 41 are arranged toward the head, and the squeezing cylinder cleaning pipe 32 and the inner cylinder cleaning pipe 41 are linked to the cleaning pipe driver 43 via a chain 42. The compressed cylinder cleaning pipe 32 is rotated and revolved along the outer peripheral surface of the compressed cylinder 28, and the inner cylinder cleaning pipe 41 is rotated at the center of the inner cylinder 29. When the filter media of the pressing cylinder 28 and the inner cylinder 29 are clogged, the sludge supply is stopped while the cake is retained in the pressing cylinder 28, or the washing water is sprayed to the pressing cylinder 28 and the inner cylinder 29 while performing dehydration. If it does, the solid content which obstruct | occluded the filtration surface of the filter medium will be washed away, and the clogging of the filter medium will be eliminated.
[0023]
FIG. 8 shows a filter medium stretched on the pressing cylinder 28, which is constituted by a wedge wire 44 in which a slit 44 a that is reduced and opened toward the pressing chamber 30 of the pressing cylinder 28 is disposed along the axial direction of the pressing cylinder 28. For example, the cake is discharged along the slit 44a of the wedge wire 44, and the pressing of the cake into the eyes of the slit 44a is prevented, so that excessive frictional resistance due to the filter medium can be prevented. Further, as shown in FIG. 9, the filter medium stretched on the pressing cylinder 28 is constituted by the punching metal 45, and the openings 45 a, 45 b, 45 c, 45 d of the punching metal 45 are sequentially made smaller from the lower end to the upper end of the pressing cylinder 28. If so, the opening of the filter medium may be made smaller toward the discharge side of the compression chamber 30 where the cake is dehydrated and the internal pressure becomes higher, thereby preventing the cake from passing through. The filter medium stretched on the filter cylinder 8 of the concentrator 2 and the dewatering cylinder 5 of the screw press 3 is also a wedge wire 44 or a punching metal 45, and is stretched on the compression cylinder 28 from the supply side toward the discharge side. It may be used.
[0024]
10 and 11 show a mobile dehydrator, which is a continuous press dehydrator 1, a service tank 47 that stores sludge such as a sewage treatment plant, and a chemical dissolver 48 that dissolves a flocculant. A chemical supply pump 49 for supplying a chemical to the chemical dissolution apparatus 48, a flocculant mixing tank 50 for stirring and mixing sludge and a flocculant, a mud supply press-in pump 51 for supplying the sludge, and air for operating the cylinder The compressor 52 and the operation panel 53 of these devices are mounted, respectively, the concentrated sludge reduced by the concentrator 2 is pressurized and dehydrated with the screw press 3 to increase the pushing pressure, and the screw blades are abolished. Since the squeezing and dewatering is performed by the squeezing cylinder 28, the dehydrating device can be simplified and labor-saving, and the mobile dehydrating vehicle 46 can be mounted on the vehicle and has a compact weight and space.
[0025]
【The invention's effect】
The concentrator and the continuous pressure dehydrator using the concentrator and the mobile dehydrator according to the present invention are configured as described above. The concentrator for concentrating and reducing the sludge having a low concentration, A combination of a screw press that pressurizes and dehydrates into a cake and acts as an indenter, and a press dehydrator that compresses and dehydrates a cake that has been dehydrated into a half cake by shearing and compaction, thus enabling high pressure dewatering. This continuous press dehydrator is also compact. That is, the concentrator of the first invention according to the present invention has screw blades arranged in a standing filter cylinder, opens a sludge supply path of the feed shaft to the filter cylinder, and the lower end of the filter cylinder is connected to the screw press. Since the dehydrating cylinder is communicated, the filtrate is separated by the gravity of the conveying force of the screw blades and the vertical posture, and the screw blades regenerate the filter medium surface, and a large amount of sludge can be processed. Since the sludge concentration is low, there is no wear on the screw blades. Further, since the sludge is supplied between the screw blades, the flocs are not broken and the filtration performance is not deteriorated.
[0026]
The continuous pressure dehydrator using the concentrator according to the first invention communicates a concentrator having standing screw blades with the start end of the screw press, and screwed the press-fitting pipe of a press dehydrator without screw blades installed vertically. Since the back pressure adjusting plate is connected to the back end of the press and the back pressure pipe at the back end of the press dehydrator, a screw press that dehydrates the concentrated sludge that has been reduced by combining the concentrator and the screw press. It acts as an indenter and applies a shearing action to the soft cake that is pressed while supporting the cake of the pressing cylinder by the bending resistance of the pressing tube, and the compression action by the weight of the pressing cake and the conveying pressure of the screw press, and the back from the back pressure tube Pressure dewatering and applying a shearing action in the back pressure pipe to make the water content variation uniform, reducing wear on the screw blades and high-pressure squeezing of sewage sludge and purified water sludge And mass treatment becomes possible, it can be simplified and labor-saving device.
[0027]
Along with the continuous pressure dehydrator of the first invention, a filtration cylinder washing tube provided on a rotatable filtration cylinder, a dehydration cylinder washing pipe provided on a dehydration cylinder of a screw press, and an outer peripheral surface of a pressing cylinder A squeezing cylinder cleaning tube that is revolved is disposed, and clogging of the filter medium surface can be eliminated by spraying cleaning water. Further, if a heating fluid supply pipe is connected to an inner cylinder provided in the squeezing cylinder to form a heating chamber, the evaporation of the cake moisture and the sludge properties can be changed to improve the dehydration property. And if a suction chamber is provided in the outer peripheral part of a pressing cylinder and a dehydration chamber is attracted | sucked, the cake of a compression chamber will be attracted | sucked and dehydrating property will become good. At the same time, if a cake heating device is provided in the inner cylinder, the boiling point decreases due to the reduced pressure, and the moisture in the cake in the low temperature heating state is evaporated. If a filter medium is stretched on the inner cylinder and a rotatable inner cylinder cleaning pipe is provided on the inner peripheral surface of the inner cylinder, double-side filtration with a dehydrating cylinder becomes possible, and the amount of sludge treatment increases.
[0028]
If the continuous pressure dehydrator according to the present invention is placed on a mobile dehydrator, the cake is reduced in weight by a concentrator and a screw press compared to a conventional mobile dehydrator using a screw press or a centrifugal separator. Therefore, the dehydrating device can be simplified and labor-saving, and it can be loaded onto a vehicle to form a compact mobile dehydrator with reduced weight and space. Sludge generated from multiple water purification plants or sewage treatment plants can be treated.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a continuous pressure dehydrator using a concentrator according to the present invention.
FIG. 2 is a longitudinal side view of the concentrator according to the present invention.
FIG. 3 is a longitudinal sectional view of a screw press connected to a concentrator according to the present invention.
FIG. 4 is a longitudinal sectional view of a press dehydrator according to the present invention.
FIG. 5 is also a longitudinal side view of another embodiment in which the inner cylinder of the press dehydrator is a heating chamber.
FIG. 6 is also a longitudinal side view of another embodiment in which a suction chamber is provided in the peripheral portion of the dewatering cylinder of the press dehydrator.
FIG. 7 is also a longitudinal sectional side view of another embodiment in which a filter medium is stretched on the inner cylinder of the press dehydrator.
FIG. 8 is also a partial perspective view of an embodiment in which a filter medium used for a pressing cylinder is a wedge wire.
FIG. 9 is also a partial perspective view of an embodiment in which the filter medium used for the pressing cylinder is punched metal.
FIG. 10 is a side view of the mobile dewatering vehicle according to the present invention.
FIG. 11 is also a plan view of the mobile dewatering vehicle.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Continuous press dehydrator 2 Concentrator 3 Screw press 4 Press dehydrator 5 Dehydration cylinder 5a Starting end part 5b Rear end part 7 Press-in pipe 8 Filter cylinder 12, 23 Screw blades 13, 24 Feed shaft 14 Filtration chamber 16 Supply path 16a Supply port DESCRIPTION OF SYMBOLS 18 Filtration pipe | tube washing | cleaning pipe | tube 17 Discharge port 22 Dehydration pipe | tube washing pipe | tube 28 Squeezing pipe | tube 29 Inner pipe | tube 30 Pressure chamber 32 Pressure pipe washing pipe | tube 33 Back pressure pipe 35 Back pressure adjustment plate 36 Supply pipe 37 Heating chamber 39 Suction chamber 41 Inner pipe washing pipe 47 Service tank 48 Chemical dissolution equipment 50 Coagulant mixing tank

Claims (6)

  A feed shaft (13) around which a screw blade (12) is wound is suspended inside a standing filter tube (8), and the filter tube (8) and the feed shaft (13) are rotatably arranged, The sludge supply path (16) provided on the feed shaft (13) is opened at the top of the filtration cylinder (8), and the lower end of the filtration cylinder (8) is the starting end of the dewatering cylinder (5) of the screw press (3). (5a) is connected to the rear end (5b) of the dewatering cylinder (5) to the curved press-fitting pipe (7), and the pressing cylinder (28 is connected to the rear end of the press-fitting pipe (7). ), The inner cylinder (29) is arranged inside the compression cylinder (28) to form the compression chamber (30), and the curved back pressure pipe ( 33), a continuous pressure dehydrator using a concentrator, wherein a back pressure adjusting plate (35) is disposed at the rear end of the back pressure pipe (33). A filter cylinder cleaning pipe (18) provided on the rotatable filter cylinder (8), a dehydrating cylinder cleaning pipe (22) provided on a screw press dehydrating cylinder (5), and an outer periphery of the pressing cylinder (28) 2. A continuous pressure dehydrator using a concentrator according to claim 1 , further comprising a squeeze cylinder cleaning pipe (32) for revolving the surface. The concentrator according to claim 1 or 2 , wherein a heating fluid supply pipe (36) is connected to an inner cylinder (29) provided in the pressing cylinder (28) to form a heating chamber (37). Continuous pressure dehydrator using The continuous using the concentrator according to any one of claims 1 to 3 , wherein a suction chamber (39) is provided on an outer peripheral portion of the pressing cylinder (28) to suck the pressing chamber (30). Pressure dehydrator. The concentrator according to claim 1 , wherein a filter medium is stretched over the inner cylinder (29), and a rotatable inner cylinder cleaning pipe (41) is provided on the inner peripheral surface of the inner cylinder (29). The continuous pressure dehydrator used. The upright concentrator (2) according to claim 1 is communicated with the start end (5a) of the dewatering cylinder (5) of the screw press (3) and is compressed into the rear end (5b) of the dewatering cylinder (5). A continuous press dehydrator (1) constructed by suspending a dehydrator (4), a service tank (47) for storing sludge, a chemical dissolving device (48) for dissolving a flocculant, and a sludge and a flocculant. A mobile dewatering vehicle comprising: a flocculant mixing tank (50) that is stirred and mixed and fed to a continuous squeezing dehydrator (1).

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