JP2010058039A - Sludge dewatering apparatus and sludge dewatering method - Google Patents

Abstract

To provide a sludge dewatering device capable of stably dewatering sludge with a simple configuration.
[Solution]
Sludge agglomeration tank 1,
A spiral screw 12 is rotatably accommodated inside the filter cylinder 11, and the aggregated sludge is conveyed while conveying the aggregated sludge introduced into the filter cylinder 11 from the sludge aggregation tank 1 by rotating the spiral screw 12. The sludge concentration device 2 that concentrates the sludge by filtering the water contained in the filter tube 11 and discharges the concentrated sludge from the inside of the filter cylinder 11;
A press-fitting screw press-type dehydrator 3 for dewatering the concentrated sludge supplied from the sludge concentrator 2;
In the sludge dewatering device equipped with
The sludge concentrating device 2 and the screw press type dehydrator 3 are connected by a mud feeding pipe 5 without using a pump, and the concentrated sludge is screwed from the mud feeding pipe 5 by the mud feeding pressure by the spiral screw 12 of the sludge concentrating device 2. The press-type dehydrator 3 is configured to be press-fitted.
[Selection] Figure 1

Description

  The present invention relates to a sludge dewatering device including a sludge agglomeration tank, a sludge concentrating device, and a screw press type dehydrator, and a method carried out using the sludge dewatering device.

  In order to dispose or incinerate various sludges such as sludge generated in sewage sludge and industrial wastewater treatment, sludge is dehydrated with a dehydrator. It is difficult to do well. For this reason, prior to the dewatering treatment by the sludge dewatering machine, the sludge is agglomerated with a flocculant in a sludge agglomeration tank to form a floc, and the flocculent agglomerated sludge is supplied to a sludge concentrating device, from which moisture And the sludge is concentrated. Then, the concentrated sludge concentrated by the sludge concentrator is supplied to a dehydrator, dehydrated, and discharged as a dehydrated cake.

  A conventional example of such a sludge dewatering device is shown in FIG.

  FIG. 3 is a schematic cross-sectional view showing a basic configuration of a conventional sludge dewatering apparatus. The sludge dewatering apparatus shown in the figure includes a sludge aggregating tank 101, a sludge concentrating apparatus 102, and a screw press type dewatering machine 103. 101 and the sludge concentrator 102 are connected by a coagulated sludge pipe 104, and the sludge concentrator 102 and the screw press type dehydrator 103 are connected by a mud pipe 105. A raw mud pipe 107 is connected to the lower part of the sludge agglomeration tank 101, and a separation liquid discharge pipe 113 is led out from the sludge concentrator 102. The mud pipe 105 is provided with a sludge discharge pump 120 such as a positive displacement screw pump (see, for example, Patent Document 1).

  Thus, sludge (raw mud) is supplied from the raw mud pipe 107 to the sludge flocculation tank 101. The sludge flowing through the raw mud pipe 107 is added with a flocculant such as a polymer, and the sludge to which the flocculant is added. Is agitated by the agitator 109 in the sludge agglomeration tank 101, and the solid component contained in this sludge is flocked to become agglomerated sludge.

  The agglomerated sludge is introduced from above into the filter cylinder 111 of the sludge concentrator 102 through the agglomerated sludge pipe 104, and in the sludge concentrator 102, the spiral screw 112 is driven at a predetermined speed in the filter cylinder 111 by the motor 114. The condensed sludge introduced into the filter cylinder 111 is conveyed downward by the rotating spiral screw 112 and the moisture contained therein passes through the filtration surface 111a of the filter cylinder 111. The separated liquid is stored in the outer cylinder 110 as a separated liquid, and the separated liquid is discharged to the outside from a separated liquid discharge pipe 113 connected to the outer cylinder 110.

  Further, the aggregated sludge transported downward in the filter cylinder 111 by the rotation of the spiral screw 112 is concentrated by separating moisture in the middle thereof to become concentrated sludge, and this concentrated sludge is converted by the sludge discharge pump 120. The inside of the dewatering cylinder 115 is moved in the longitudinal direction by a screen 116 that is introduced from the hopper 121 of the screw press type dehydrator 103 through the mud pipe 105 to one end in the longitudinal direction of the dewatering cylinder 115 and is driven to rotate in the dewatering cylinder 115. It is compressed and dehydrated in the process of being conveyed to the end, the dehydrated filtrate is discharged to the outside of the dehydrating cylinder 115, and the dehydrated cake is discharged to the outside from the end outlet of the dehydrating cylinder 115.

  Moreover, the other example of the conventional sludge dehydration apparatus is shown in FIG. 4 (for example, refer patent document 2). FIG. 4 is a schematic sectional view showing another conventional example of the sludge dewatering device. In this figure, the same elements as those shown in FIG. Description of is omitted.

  The sludge dewatering apparatus shown in FIG. 4 employs a system in which the concentrated sludge concentrated in the sludge concentrating apparatus 102 is supplied to the screw press type dehydrator 103 by the screw conveyor 130, and is formed in the sludge aggregation tank 101. The agglomerated sludge is introduced into the lower part of the filter cylinder 111 of the sludge concentrator 102, and the agglomerated sludge introduced into the filter cylinder 111 is moved upward in the filter cylinder 111 by a spiral screw 112 that is driven to rotate in the filter cylinder 111. In the process, moisture is filtered and discharged from the outer cylinder 110 via the separation liquid discharge pipe 113 to the outside, and the concentrated sludge from which moisture has been removed is discharged from the upper part of the filter cylinder 111, and the screw conveyor 130 is supplied to the screw press type dehydrator 103 for dehydration.

By the way, in the conventional sludge dewatering apparatus shown in FIGS. 3 and 4, the sludge treatment amount of the sludge concentrator 102 is set to be larger than the sludge treatment amount of the screw press type dehydrator 103, and the operation is continued. The level of the hopper 121 of the mold dehydrator 103 is detected by a level meter (not shown), and when the detected level exceeds the upper limit of the set value, the operation of the sludge agglomeration tank 101 and the sludge concentrator 102 is stopped, and the level is set to the set value. If the lower limit is exceeded, the operation of the sludge agglomeration tank 101 and the sludge concentrator 102 is restarted, and the control to repeat this operation stop and operation restart is performed.
Japanese Patent Publication No. 2-000120 JP 2008-043911 A

  However, the conventional sludge dewatering device shown in FIGS. 3 and 4 requires the sludge discharge pump 120 and the screw conveyor 130 for supplying the concentrated sludge from the sludge concentrating device 102 to the screw press type dehydrator 103. There is a problem that the structure becomes complicated.

  In addition, the structure is complicated in the method in which the hopper 121 for supplying the concentrated sludge to the screw press type dehydrator 103 is provided and the operation of the sludge concentrator 102 is controlled by detecting the level of the hopper 121 with a level meter. In addition, a bridge phenomenon may occur in the hopper 121, which may make it impossible to supply the concentrated sludge to the screw press dehydrator 103. When the sludge discharge pump 120 is used, the concentrated sludge can be directly pressed into the screw press type dehydrator 103 without using the hopper 121. However, since the sludge discharge pump 120 is required, there is a problem of complicated structure. Is inevitable.

  The present invention has been made in view of the above problems, and an object thereof is to provide a sludge dewatering apparatus and a sludge dewatering method capable of stably dewatering sludge with a simple configuration.

In order to achieve the above object, the invention according to claim 1
A sludge agglomeration tank;
A filter cylinder is accommodated in the outer cylinder, a screw is rotatably accommodated inside the filter cylinder, and the screw is rotated to drive the sludge to be introduced into the filter cylinder from the sludge coagulation tank. Meanwhile, the sludge concentrating device that concentrates the sludge by allowing the moisture contained in the aggregated sludge to pass through the filtration surface of the filter cylinder and discharging it as a separation liquid, and discharging the concentrated concentrated sludge from the inside of the filter cylinder When,
A press-fitting screw press type dehydrator for dewatering the concentrated sludge supplied from the sludge concentrator;
In the sludge dewatering device equipped with
The sludge concentrating device and the screw press type dehydrator are connected by a mud feeding pipe without using a pump, and the concentrated sludge is fed from the mud feeding pipe by the mud feeding pressure by the screw of the sludge concentrating device. It is characterized by being configured to press fit into the machine.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, a pressure gauge is installed in the mud pipe.

The invention described in claim 3
A sludge agglomeration tank;
A filter cylinder is accommodated in the outer cylinder, a screw is rotatably accommodated inside the filter cylinder, and the screw is rotated to drive the sludge to be introduced into the filter cylinder from the sludge coagulation tank. Meanwhile, the sludge concentrating device that concentrates the sludge by allowing the moisture contained in the aggregated sludge to pass through the filtration surface of the filter cylinder and discharging it as a separation liquid, and discharging the concentrated concentrated sludge from the inside of the filter cylinder When,
A press-fitting screw press type dehydrator for dewatering the concentrated sludge supplied from the sludge concentrator;
In the sludge dewatering method using the sludge dewatering device equipped with
The sludge concentrating device and the screw press type dehydrator are connected by a mud feeding pipe without using a pump, and the concentrated sludge is fed from the mud feeding pipe by the mud feeding pressure by the screw of the sludge concentrating device. The pressure detected by the pressure gauge installed in the mud pipe is set to a set value while the sludge treatment amount in the sludge concentrator is set to be larger than the sludge treatment amount of the screw press type dehydrator When the pressure exceeds the lower limit of the set value, the operation of the sludge agglomeration tank and the sludge concentrator is resumed, and the operation is stopped and the operation resumed. It is characterized by repeating.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, when the screw rotation speed of the screw press type dehydrator is constant, and the pressure detected by the pressure gauge exceeds an upper limit of a set value, the sludge concentration is performed. It is characterized in that the amount of sludge supplied to the apparatus is reduced so that the pressure becomes a set value.

  According to a fifth aspect of the present invention, in the third aspect of the present invention, when the amount of sludge supplied to the sludge concentrator is constant and the pressure detected by the pressure gauge exceeds the upper limit of the set value, the screw press type It is characterized by increasing the number of rotations of the screw so that the pressure becomes a set value.

  According to the first aspect of the present invention, the sludge concentrator and the screw press type dehydrator are connected by a mud pipe without using a pump, and the concentrated sludge is fed from the mud pipe by the mud feed pressure by the screw of the sludge concentrator. Since the configuration in which the screw press type dehydrator is press-fitted is adopted, the pump and hopper which are conventionally required are unnecessary, and the structure can be simplified and the cost can be reduced.

  According to invention of Claim 2 and 3, it replaced with the system which detects the level of the hopper of a screw press type | mold dehydrator with a level meter, and controls the operation | movement of a sludge concentration apparatus, The pressure gauge installed in the mud pipe Since the operation of the sludge concentrator is controlled by the pressure detected by the hopper, the problem of the inability to supply the concentrated sludge due to the bridge phenomenon in the hopper cannot occur, and the stable supply of sludge concentration to the screw press dehydrator This enables stable dewatering of sludge.

  According to the invention of claim 4, if the screw rotation speed of the screw press type dehydrator is constant and the concentrated sludge accumulates in the screw press type dehydrator more than the processing capacity and the pressure exceeds the upper limit of the set value, the sludge is concentrated. Since the amount of sludge supplied to the apparatus is reduced and the pressure is controlled so as to become a set value, stable supply of sludge concentration to the screw press type dehydrator is realized, and stable dewatering treatment of sludge becomes possible.

  According to the fifth aspect of the present invention, when the amount of sludge supplied to the sludge concentrator is constant and the concentrated sludge accumulates in the screw press type dehydrator more than the processing capacity and the pressure exceeds the upper limit of the set value, the screw press type Since the rotational speed of the screw is increased to increase the processing capacity of the screw press type dehydrator, a stable supply of the concentrated sludge to the screw press type dehydrator is realized, and the sludge can be stably dehydrated. If the screw press type screw speed is increased, the pressure of the concentrated sludge will decrease, and if the pressure falls below the lower limit of the set value, if the screw press type screw speed is reduced, the processing capacity of the screw press type dehydrator will also be reduced. Therefore, the concentrated sludge can be stably supplied to the screw press dehydrator.

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

<Embodiment 1>
FIG. 1 is a schematic cross-sectional view showing a basic configuration of a sludge dewatering apparatus according to Embodiment 1 of the present invention. The sludge dewatering apparatus shown in the figure includes a sludge aggregating tank 1, a sludge concentrating device 2, and a screw press type dehydrator 3. The sludge aggregation tank 1 and the sludge concentrating device 2 are connected by a coagulated sludge tube 4, and the sludge concentrating device 2 and the screw press type dehydrator 3 are connected by a mud feeding tube (concentrated sludge tube) 5.

  The sludge dewatering device according to the present invention connects the sludge concentrating device 2 and the screw press-type dewatering device 3 with a mud pipe 5 without using a pump, and the mud fed by rotation of a spiral screw 12 described later of the sludge concentrating device 2. Concentrated sludge is pressed into the screw press dehydrator 3 from the mud pipe 5 by pressure, and a pressure gauge 6 is installed in the mud pipe 5 so that the operation is controlled based on the pressure detected by the pressure gauge 6. It is characterized by that.

  The sludge agglomeration tank 1 is a cylindrical tank-like container having an open upper surface, and a raw mud pipe 7 is connected to the lower part thereof, and a stirrer 9 that is rotationally driven by a motor 8 is provided inside. Further, the coagulated sludge pipe 4 extends substantially horizontally from the upper part of the sludge coagulation tank 1.

  Further, the sludge concentrating device 2 has a cylindrical filter tube 11 disposed in a vertical direction inside a cylindrical tank-shaped outer tube 10 having a sealed structure, and a spiral screw 12 is rotatably accommodated in the filter tube 11. Configured.

  Here, the peripheral surface of the filter cylinder 11 facing the inside of the outer cylinder 10 constitutes a filtration surface 11a made of a punching plate, a wedge wire, or the like. The extending coagulated sludge pipe 4 is connected. Further, the mud pipe 5 is led out horizontally from the lower part of the filter cylinder 11, and the pressure gauge 6 is installed in the middle thereof as described above. A separation liquid discharge pipe 13 is led out from the outer cylinder 10.

  The spiral screw 12 is configured by spirally winding a screw blade 12b around a rotating shaft 12a, and a motor 14 as a drive source is connected to the rotating shaft 12a. The outer diameter of the spiral screw 12 is set slightly smaller than the inner diameter of the filtration surface 11a of the filter cylinder 11, and a small gap is formed between the outer peripheral edge of the spiral screw 12 and the filtration surface 11a of the filter cylinder 11. Is formed.

  Thus, sludge (raw mud) is supplied from the raw mud pipe 7 to the sludge agglomeration tank 1, and a flocculant such as a polymer is added to the sludge flowing through the raw mud pipe 7, and the flocculant is added. The sludge is agitated by the agitator 9 in the sludge agglomeration tank 1, and the solid component contained in the sludge is flocked to become agglomerated sludge.

Here, the sludge liquid level h ₂ in the filter cylinder 11 is set lower than the sludge liquid level h ₁ in the sludge agglomeration tank 1 (h ₂ <h ₁ ), and both liquid levels h ₁ and h _{2 are set.} (Head difference) Δh ₁₂ (= h ₁ −h ₂ ), the agglomerated sludge in the sludge agglomeration tank 1 passes through the agglomerated sludge pipe 4 and enters the filter cylinder 11 of the sludge concentrator 2. It is introduced from.

In the sludge concentrating device 2, the spiral screw 12 is driven to rotate at a predetermined speed in the filter cylinder 11 by the motor 14, and the aggregated sludge introduced into the filter cylinder 11 is moved downward by the rotating spiral screw 12. While being transported, the moisture contained therein passes through the filtration surface 11a of the filtration cylinder 11 and is stored in the outer cylinder 10 as a separation liquid. Here, since the water level h ₃ of the separation liquid in the separation liquid discharge pipe 13 is set lower than the liquid level h ₂ in the filter cylinder 11 (h ₃ <h ₂ ), both h ₂ and h _3. The water separated from the coagulated sludge passes through the filtration surface 11a of the filtration cylinder 11 and is separated into the outer cylinder 10 with the difference pressure based on the difference (head difference) Δh ₂₃ (= h ₂ −h ₃ ) as the filtration pressure. Housed as a liquid. In this case, since the outer cylinder 10 is disposed below the water level h _{3 of the} separation liquid, the separation liquid accommodated in the outer cylinder 10 fills the outer cylinder 10 and is contained in the separation liquid. The filtration surface 11a of the filtration cylinder 11 will be buried.

  Then, the separation liquid stored in the outer cylinder 10 is discharged to the outside from a separation liquid discharge pipe 13 connected to the outer cylinder 10. Further, the coagulated sludge conveyed downward in the filter cylinder 11 by the rotation of the spiral screw 12 is concentrated by separating water in the middle thereof to become concentrated sludge, and this concentrated sludge is stored in the sludge concentrator 2. The mud pipe 5 is press-fitted into the screw press type dehydrator 3 by the mud feed pressure by the rotation of the spiral screw 12 in the filter cylinder 11.

  Here, the configuration of the screw press type dehydrator 3 will be described.

  The screw press type dehydrator 3 is configured such that a screw 16 is rotatably accommodated in a horizontally long dehydrating cylinder 15 installed horizontally. The dewatering cylinder 15 is composed of a perforated punching plate, and the screw 16 accommodated in the dewatering cylinder 15 has an outer periphery of a tapered rotor 16a whose diameter increases in the direction of conveying the concentrated sludge (right side in FIG. 1). A screw 17b is spirally wound around the rotor 16a, and a motor 17 as a drive source is connected to the rotor 16a. The outer diameter of the screw blade 16 b is set slightly smaller than the inner diameter of the dewatering cylinder 15, and a minute gap is formed between the outer peripheral edge of the screw blade 16 b and the inner surface of the dewatering cylinder 15. Further, the flow path formed between the tapered rotor 16a in the dewatering cylinder 15 is narrowed so that the cross-sectional area gradually decreases in the transport direction of concentrated sludge (right side in FIG. 1).

  Thus, the concentrated sludge concentrated by the sludge concentrating device 2 as described above is fed from the mud feed pipe 5 to the dehydration cylinder of the screw press type dehydrator 3 by the mud feed pressure by the rotation of the spiral screw 12 in the filter cylinder 11. 15 is press-fitted from the inlet at one end in the longitudinal direction and is conveyed toward the outlet side at the other end in the longitudinal direction by a screw 16 that rotates in the dehydrating cylinder 15, and is compressed and dehydrated in the process. The dehydrated filtrate separated from the concentrated sludge by dehydration passes through the dewatering cylinder 15 and is discharged to the outside, and the remaining sludge is discharged from the outlet of the dewatering cylinder 15 as a dehydrated cake.

  As described above, according to the sludge dewatering device according to the present embodiment, the sludge concentrating device 2 and the screw press type dewatering device 3 are connected to each other by the mud pipe 5 without using a pump, and the spiral of the sludge concentrating device 2 is connected. Since the configuration in which the concentrated sludge is press-fitted into the screw press type dehydrator 3 from the mud pipe 5 by the mud feed pressure by the screw 12, the conventionally required pump and hopper are unnecessary, and the structure is simplified and the cost is reduced. It is done.

  By the way, in the sludge dewatering process using the sludge dewatering apparatus according to the present embodiment, the sludge treatment amount in the sludge concentrating device 2 is set to be larger than the sludge treatment amount of the screw press type dehydrator 3, and the mud pipe When the pressure detected by the pressure gauge 6 installed in 5 exceeds the upper limit of the set value, the operation of the sludge flocculation tank 1 and the sludge concentrator 2 is stopped, and when the pressure falls below the lower limit of the set value, the sludge flocculation tank 1 and A method of restarting the operation of the sludge concentrator 2 and repeating this operation stop and operation restart is adopted, but as another operation control method, one of the following two methods is adopted.

  That is, the first method is a method in which the rotational speed of the screw 16 of the screw press type dehydrator 3 is made constant. In this method, if the pressure detected by the pressure gauge 6 exceeds the upper limit of the set value, sludge is obtained. In this method, the amount of sludge supplied to the concentrating device 2 is reduced so that the pressure becomes a set value. For example, 0.03 MPa is adopted as the pressure setting value, and the lower limit value is set to 0.02 MPa and the upper limit value is set to 0.04 MPa. That is, the operation is controlled so that the pressure falls within the range of 0.02 MPa to 0.04 MPa.

  Thus, according to this method, if the concentrated sludge accumulates in the screw press type dehydrator 3 more than the processing capacity and the pressure exceeds the upper limit of the set value, the amount of sludge supplied to the sludge concentrator 2 is reduced and the pressure is reduced. Since control is performed so that the set value is obtained, stable supply of concentrated sludge to the screw press type dehydrator 3 is realized, and stable dewatering treatment of sludge becomes possible.

  The second method is a method in which the amount of sludge supplied to the sludge concentrator 2 is made constant. In this method, when the pressure detected by the pressure gauge 6 exceeds the upper limit of the set value, the screw press type dehydrator 3 is used. The number of rotations of the screw 16 is increased so that the pressure becomes a set value.

  Thus, according to this method, when the concentrated sludge accumulates in the screw press dehydrator 3 to a capacity higher than the processing capacity and the pressure exceeds the upper limit of the set value, the rotation speed of the screw 16 of the screw press dehydrator 3 is increased. Since the processing capacity of the screw press type dehydrator 3 is increased, a stable supply of concentrated sludge to the screw press type dehydrator 3 is realized, and the sludge can be stably dehydrated. If the rotational speed of the screw 16 of the screw press type dehydrator 3 is increased, the pressure of the concentrated sludge decreases, and if the pressure falls below the lower limit of the set value, if the rotational speed of the screw 16 of the screw press type dehydrator 3 is decreased, the screw Since the processing capacity of the press-type dehydrator 3 is also reduced, it is possible to stably supply the concentrated sludge to the screw press-type dehydrator 3.

  The relationship between the sludge treatment amount and the moisture content in the operation method for controlling the pressure to be a set value will be described. In the operation where the sludge treatment amount is, for example, 50 kg-DS, the rotation speed of the screw 16 of the screw press type dehydrator 3 However, when the sludge treatment amount is, for example, 100 kg-DS, the screw 16 of the screw press type dehydrator 3 is rotated at around 0.75 rpm and the moisture content is about 82%. %. As described above, when the sludge treatment amount is increased, control is performed to increase the rotational speed of the screw 16, and the sludge residence time in the screw press type dehydrator 3 is shortened, and the moisture content of the sludge is increased.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIG.

  FIG. 2 is a schematic cross-sectional view showing the basic configuration of the sludge dewatering apparatus according to Embodiment 2 of the present invention. In this figure, the same elements as those shown in FIG. The re-explanation about them is omitted.

  The sludge dewatering apparatus according to the present embodiment is the same as the configuration of the sludge dewatering apparatus according to the first embodiment except that the vertical screw press dehydrator 3 is used. The machine 3 is configured such that a screw 16 is accommodated in a vertical direction inside a dewatering cylinder 15 that is vertically arranged. Here, the screw 16 is configured by spirally winding screw blades 16b around a tapered rotor 16a that expands in the upward direction, which is the discharging direction of the concentrated sludge, and is tapered in the dewatering cylinder 15. The flow path formed between the rotor 16a and the rotor 16a is narrowed so that the cross-sectional area gradually decreases in the upward direction, which is the conveying direction of the concentrated sludge.

  Also in the present embodiment, as in the first embodiment, the concentrated sludge concentrated by the sludge concentrating device 2 is supplied to the mud pipe 5 by the mud pressure caused by the rotation of the spiral screw 12 in the filter cylinder 11. From the lower end inlet in the dehydrating cylinder 15 of the screw press type dehydrator 3, it is conveyed toward the upper outlet by the screw 16 rotating in the dehydrating cylinder 15, and is compressed and dehydrated in the process. The dehydrated filtrate separated from the concentrated sludge by dehydration is discharged to the outside from the lower end of the dewatering cylinder 15, and the remaining sludge is discharged from the upper end outlet of the dewatering cylinder 15 as a dehydrated cake.

  Thus, also in the sludge dewatering device according to the revision of the present embodiment, the sludge concentrating device 2 and the screw press type dewatering device 3 are connected by the mud pipe 5 without using a pump, and the spiral screw 12 of the sludge concentrating device 2 is connected. Since the configuration in which concentrated sludge is press-fitted into the screw press type dehydrator 3 from the mud pipe by the mud pressure due to the pump, the conventionally required pump and hopper become unnecessary, and the structure can be simplified and the cost can be reduced. At the same time, by adopting the same operation control method as that of the above-described embodiment, it is possible to obtain a stable supply of concentrated sludge to the screw press dehydrator 3.

It is a schematic sectional drawing which shows the basic composition of the sludge dehydration apparatus which concerns on Embodiment 1 of this invention. It is a schematic sectional drawing which shows the basic composition of the sludge dehydration apparatus which concerns on Embodiment 2 of this invention. It is a schematic sectional drawing which shows the basic composition of the conventional sludge dehydration apparatus. It is a schematic sectional drawing which shows the basic composition of the conventional sludge dehydration apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sludge coagulation tank 2 Sludge concentrator 3 Screw press type dehydrator 4 Coagulated sludge pipe 5 Feeding mud pipe 6 Pressure gauge 7 Raw mud pipe 8 Motor 9 Stirrer 10 Outer cylinder 11 Filtration cylinder 11a Filtration surface of the filtration cylinder 12 Spiral screw 12a Spiral Screw rotation shaft 12b Spiral screw screw blade 13 Separation liquid discharge pipe 14 Motor 15 Dehydration cylinder 16 Screw 16a Screw rotor 16b Screw blade 17 Motor

Claims (5)

A sludge agglomeration tank;
A filter cylinder is accommodated in the outer cylinder, a screw is rotatably accommodated inside the filter cylinder, and the screw is rotated to drive the sludge to be introduced into the filter cylinder from the sludge coagulation tank. Meanwhile, the sludge concentrating device that concentrates the sludge by allowing the moisture contained in the aggregated sludge to pass through the filtration surface of the filter cylinder and discharging it as a separation liquid, and discharging the concentrated concentrated sludge from the inside of the filter cylinder When,
A press-fitting screw press type dehydrator for dewatering the concentrated sludge supplied from the sludge concentrator;
In the sludge dewatering device equipped with
The sludge concentrating device and the screw press type dehydrator are connected by a mud feeding pipe without using a pump, and the concentrated sludge is fed from the mud feeding pipe by the mud feeding pressure by the screw of the sludge concentrating device. A sludge dewatering device that is configured to be press-fitted into a machine.   The sludge dewatering apparatus according to claim 1, wherein a pressure gauge is installed in the mud pipe. A sludge agglomeration tank;
A filter cylinder is accommodated in the outer cylinder, a screw is rotatably accommodated inside the filter cylinder, and the screw is rotated to drive the sludge to be introduced into the filter cylinder from the sludge coagulation tank. Meanwhile, the sludge concentrating device that concentrates the sludge by allowing the moisture contained in the aggregated sludge to pass through the filtration surface of the filter cylinder and discharging it as a separation liquid, and discharging the concentrated concentrated sludge from the inside of the filter cylinder When,
A press-fitting screw press type dehydrator for dewatering the concentrated sludge supplied from the sludge concentrator;
In the sludge dewatering method using the sludge dewatering device equipped with
The sludge concentrating device and the screw press type dehydrator are connected by a mud feeding pipe without using a pump, and the concentrated sludge is fed from the mud feeding pipe by the mud feeding pressure by the screw of the sludge concentrating device. The pressure detected by the pressure gauge installed in the mud pipe is set to a set value while the sludge treatment amount in the sludge concentrator is set to be larger than the sludge treatment amount of the screw press type dehydrator When the pressure exceeds the lower limit of the set value, the operation of the sludge agglomeration tank and the sludge concentrator is resumed, and the operation is stopped and the operation resumed. The sludge dewatering method characterized by repeating.   When the screw rotation speed of the screw press type dehydrator is constant and the pressure detected by the pressure gauge exceeds the upper limit of a predetermined value, the amount of sludge supplied to the sludge concentrator is reduced and the pressure becomes a set value. The sludge dewatering method according to claim 3, wherein: The sludge supply amount to the sludge concentrator is made constant, and when the pressure detected by the pressure gauge exceeds the upper limit of a predetermined value, the screw rotation speed of the screw press mold is increased so that the pressure becomes a set value. The sludge dewatering method according to claim 3.

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