JPH08215699A - Sludge treatment apparatus - Google Patents

Abstract

PURPOSE: To reduce the moisture content of excessive sludge to about zero % by dehydrating sludge by a moisture separation means and subsequently drying the sludge bonded to a reticulated amterial by centrifugal separating action by utilizing hot air. CONSTITUTION: When a sludge treatment apparatus 1 is used, a screw drum 3 is rotated by a drive motor 17 and negative pressure is generated in the part of a metal net 8 by driving a suction ring blower 30. A ring blower 31 is driven not only to close the solenoid valve 43 incorporated in the pipe 40 of a compressed air discharge means 6 but also to open the solenoid valve 42 of a pipe 35 in which a heater 34 is incorporated. Hot air is discharged into the metal net 8 from the respective holes 9a of a pipe shaft 9 through a T-shaped pipe joint 22, the nipple 37 and elbow 38 in the pipe shaft 9 and a pipe 39. Further, a solenoid valve 44 is opened by driving a sludge supply pump 2 and the sludge in a sludge tank 7 is sent into the pipe shaft 9 through a sludge supply pipe 23, the T-shaped pipe joint 22 and a doweled joint 20 to be bonded to the metal net 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sludge treatment device,
In particular, it relates to a sludge treatment device for separating water in sludge by dehydration treatment.

[0002]

2. Description of the Related Art Conventionally, biological treatment in wastewater treatment,
Excess sludge was generated when chemical treatment and physical treatment were performed. A belt press dehydrator, a pressure dehydrator, a vacuum dehydrator, a squeezing pressure dehydrator, etc., which separates the water in the sludge through a filter cloth or a filter plate by treating the excess sludge by depressurizing or pressurizing it. Sludge treatment equipment is used.

Such a sludge treatment apparatus, for example, as shown in FIG. 3, includes a pump 51 for pumping sludge from a sludge tank (not shown), and a sludge storage section 52 for storing the sludge pumped by the pump 51. A filter cloth 53 that conveys the sludge stored in the sludge storage section 52, a suction section 54 for separating water in the sludge placed on the filter cloth 53, and a sludge from which water has been separated (hereinafter referred to as cake and The roll C on which C is transferred from the filter cloth 53, and the cake C transferred on the roll 55
There is used a filter cloth type dehydrator provided with a cutter 56 for peeling off the filter cloth and a shower 57 for cleaning the filter cloth 53 from which the cake C has been removed by the roll 55.

The filter cloth 53 is moved by a motor 58,
A drive roller 59 mounted on a motor 58 guides the sludge storage section 52 to a roller 60.
It is guided to the roll 55 via a, is guided from the roll 55 to the shower 57 via the rollers 60b and 60c, and is wound so as to return to the drive roller 59.

A sludge treatment device 50 constructed in this way
The sludge pumped from the sludge tank by the pump 51 is supplied to the sludge storage section 52, and the sludge stored in the sludge storage section 52 is conveyed to the roll 55 by the filter cloth 53. At this time, the suction ring blower 54a of the suction unit 54 sucks together with air from the lower portion of the filter cloth 53 located in the sludge storage unit 52 to remove moisture from the sludge. The sludge from which water has been removed, that is, the cake C is conveyed to the roll 55 by the filter cloth 53, and this cake C is transferred to the roll 55. After that, the cake C transferred to the roll 55 is peeled off by the cutter 56. In addition, the cake C is made by the roll 55.
The filter cloth 53 from which is removed is washed by the shower 57.

[0006]

However, in such a filter cloth type dehydrator, the maximum moisture dehydration rate is about 20%.
Therefore, the water content of the sludge dehydrated by this dehydrator was about 80%. Further, even in the press type dehydrator, the maximum water content dehydration rate was about 40%, so the water content rate of the dehydrated sludge was about 60%. Therefore, although the amount of sludge remaining after dehydration increases, the amount of water content in the sludge must be further reduced by using a dryer, which requires a great deal of cost and time. Even when dried by a dryer, the water content of sludge is 40 to 2
It was 0%.

[0007] When treating such sludge as industrial waste, it must be disposed in consideration of environmental pollution, and the disposal place is limited. In addition, the water content of the sludge treated in this way could lead to the proliferation of bacteria such as Escherichia coli. Furthermore, in the filter cloth type dehydrator, the filter cloth contaminated with sludge had to be washed with a shower, and when the dehydrator was operated all day long, about 6 m ³ of tap water had to be used.

[0008]

[Purpose] The present invention has been made to solve such conventional problems, and reduces the water content of excess sludge generated during biological treatment, chemical treatment, and physical treatment to near 0%. It is an object of the present invention to provide a sludge treatment device.

[0009]

The sludge treatment apparatus of the present invention which achieves such an object is a sludge supply means for pumping sludge from a sludge tank and a sludge supplied from the sludge supply means projected by a centrifugal force. Also, sludge projecting means covering the mesh material for adhering the projected sludge, moisture separating means for separating moisture from the sludge adhering to the mesh material of the sludge projecting means by negative pressure, and moisture separating means And compressed air supply means for supplying compressed air into the reticulated material to which sludge separated is attached, and compressed air superheating means for converting the compressed air into hot air when supplying compressed air into the reticulated material with the compressed air supply means After supplying the hot air from the compressed air heating means into the mesh material to which the sludge from which water has been separated adheres, the compressed air supplied from the compressed air supply means is directed from the outside of the mesh material to the mesh material. It is obtained by a compressed air release means for releasing.

Further, in the sludge treatment device of the present invention,
The compressed air supply means is provided with compressed air switching means for selectively supplying compressed air supplied from the compressed air supply means to the compressed air heating means and the compressed air discharge means. In addition, the sludge treatment device of the present invention is provided with an electromagnetic valve that is interlocked with the sludge supply means in order to selectively supply the sludge to the sludge projection means.

Further, in the sludge treatment apparatus of the present invention, the sludge projecting means spirally moves the dried sludge by the hot air from the compressed air superheating means, and
And a discharge port for discharging sludge spirally moved by the spiral member.

[0012]

The sludge pumped from the sludge tank by the sludge supply means is supplied to the sludge projection means. The sludge projecting unit projects the supplied sludge toward the covered mesh material by centrifugal force. This allows the sludge to be uniformly attached to the net material. Moisture is separated from the sludge uniformly attached to the mesh material by the negative pressure action of the water separation means.

Further, the compressed air supplied from the compressed air supply means is made into hot air by the compressed air superheating means, and this hot air is filled in the reticulated material through the sludge projecting means. As a result, the sludge uniformly attached to the reticulated material can be easily dried and can be separated from the reticulated material. Further, after the hot air is supplied into the reticulated material by the compressed air supply means and the compressed air superheating means, the dried sludge adhering without being separated from the reticulated material is removed by the compressed air discharged from the compressed air discharging means.

The compressed air supplied from the compressed air supply means can be selectively supplied to the inside and outside of the mesh material by the compressed air switching means. Further, since the electromagnetic valve interlocked with the sludge supply means is provided, the sludge can be supplied to the sludge projection means only when the sludge supply means is pumping the sludge. Further, since the spiral member provided in the sludge projecting means can spirally move the dry sludge to the discharge port, the dry sludge can be discharged from the sludge projecting means to the outside.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. As shown in FIG. 1, the sludge treatment apparatus of the present invention projects and projects a sludge supply pump 2 which is a sludge supply means for pumping sludge from a sludge tank 7 and a sludge supplied from the sludge supply pump 2 by centrifugal force. The screw drum 3 which is a sludge projecting means covered with a metal net 8 which is a mesh material for adhering the sludge that has been adhered thereto, and a water separation means 4 which separates water from the sludge adhered to the metal mesh 8 by negative pressure.
And a compressed air supply means 5 for supplying compressed air into the wire net 8 to which the sludge having the water content separated by the water separation means 4 is attached, and compressed air supplied from the compressed air supply means 5 from the outside of the wire mesh 8. Compressed air discharge means 6 for The sludge supply pump 2 is used by being submerged in the sludge in the sludge tank 7.

The screw drum 3 is fixed to a hollow pipe shaft 9, a spiral member 10 spirally welded to the hollow pipe shaft 9, and both ends of the spiral member 10 welded to the hollow pipe shaft 9. Discs 11 and 12
It consists of and. The hollow pipe shaft 9 is provided with a plurality of holes 9a between spiral members 10 which are spirally welded, and the disc 11 is provided with a discharge port 11a for discharging sludge. The discs 11 and 12 of the screw drum 3
The wire mesh 8 is provided on the circumference of the spiral member 10 which is welded in a spiral shape. The wire netting 8 is doubly covered, a fine wire netting 8a is firstly covered, and a coarse wire netting 8b is covered on the wire netting 8a.

The screw drum 3 thus constructed
Has a hollow pipe shaft 9 rotatably fixed to a frame 45 via two pillow type bearing units 13 and 14. The hollow hole of the hollow pipe shaft 9 located on the pillow type bearing unit 13 side is closed by a blind plug 15. The hollow pipe shaft 9 has a pillow type bearing unit 14 fixed to the frame 45 and the disk 12 fixed to the hollow pipe shaft 9.
The sprocket 16 is fixed between and. The sprocket 16 has a chain 19 attached to a sprocket 18 mounted on a drive motor 17 fixed to one end of a frame 45.
Are connected by

Further, as shown in FIG. 2, one end of a sebel joint 20 is screwed to the pillow type bearing unit 14 side of the pipe shaft 9, and a nipple 21 is screwed to the other end of the sebel joint 20. There is. The opening 22a of the T-type pipe joint 22 is screwed into the nipple 21, and the sludge supply pipe 23 connected to the sludge supply pump 2 is screwed into the opening 22b of the T-type pipe joint 22. In addition, even if one side of the sebel joint 20 is fixed, the other side of the sebel joint 20 can be rotated. Therefore, even if the T-type pipe joint 22 is fixed,
The screw drum 3 can be rotated. Further, since the sliding portion 20a of the sebel joint 3 is kept airtight by the oil seal 24 and the like, the sludge does not leak from the sebel joint 20 even when sludge is supplied.

As shown in FIG. 1, the water separating means 4 includes an upper cover 25 and a lower cover 26 provided so as to cover the screw drum 3 from above and below, and a bifurcated pipe 27 provided at the lower cover 26. It is composed of a gas-liquid separation box 28 to be connected and a suction ring blower 30 connected to a pipe 29 connected to the gas-liquid separation box 28. In such a configuration, when the suction ring blower 30 is driven to suck the water from the sludge attached to the wire net 8, the water sucked from the sludge is transferred from the lower cover 26 to the gas-liquid separation box 28 via the pipe 27. Be guided. At this time, since water and air are separated by the difference in the flow velocity caused by the difference between the volume ratio of the pipe 27 and the volume ratio of the gas-liquid separation box 28, the pipe 29 connected to the suction ring blower 30 contains only air. Are inhaled and released into the atmosphere.

The compressed air supply means 5 comprises a ring blower 31 for supplying compressed air and a pipe 32 connected to the ring blower 31. The pipe 32 has a T-type pipe joint 33 for heating the compressed air. Is connected to the pipe 35 in which the heater 34 is incorporated. This pipe 35
As shown in FIG. 2, is connected to the opening 22c of the T-type pipe joint 22 via a socket 36 having a different diameter. A nipple 37 is screwed into the small diameter female thread portion of the different diameter socket 36,
An elbow 38 is screwed onto the nipple 37, and a pipe 39 provided inside the pipe shaft 9 is screwed onto the elbow 38. The pipe 39 is inserted up to the position where the disc 12 is fixed. As a result, when the compressed air from the ring blower 31 is pressure-fed to the pipe 32 and the pipe 35, the heater 34 incorporated in the pipe 35 raises the temperature of the compressed air, so that this hot air flows through the pipe 39 to the pipe shaft 9. Hot air is emitted from the plurality of perforated holes 9a.

The compressed air discharge means 6 is a compressed air supply means 5
The pipe 40 is connected to the ring blower 31 used in 1. through a T-shaped pipe joint 33, and the pipe 41 for discharging compressed air is connected to the pipe 40. Pipe 41
Has a plurality of holes 41a for discharging compressed air and both ends are closed. In addition, a solenoid valve 42 is provided on the side of the T-type pipe joint 22 of the pipe 35 in which the heater 34 is incorporated.
And a solenoid valve 43 is installed on the T-type pipe joint 33 side of the pipe 40. The solenoid valve 42 and the heater 34
The heater 34 is energized as soon as the electromagnetic valve 42 is opened, so that the compressed air from the ring blower 31 becomes hot air and is supplied to the pipe shaft 9 of the screw drum 3. As a result, the ring blower 31
The compressed air from the can be selectively supplied to the pipe shaft 9 of the screw drum 3 for discharging hot air into the wire net 8 and the pipe 41 for discharging the compressed air from the outside of the wire net 8 toward the wire net 8. .

Further, the sludge supply pipe 23 fixed to the sludge supply pump 2 is equipped with a solenoid valve 44 interlocking with the sludge supply pump 2. As a result, the sludge can be supplied to the pipe shaft 9 of the screw drum 3 only when the sludge supply pump 2 pumps the sludge. The operation of the sludge treatment device 1 configured as above will be described below.

In order to put the sludge treatment apparatus 1 into an operable state, the screw drum 3 is rotated by the drive motor 17, and the suction ring blower 30 is further driven to generate a negative pressure in the wire mesh 8 portion. Next, the ring blower 31 is driven, the solenoid valve 43 incorporated in the pipe 40 of the compressed air discharging means 6 is closed, and the solenoid valve 42 of the pipe 35 incorporating the heater 34 is opened. At this time, since the heater 34 is overheated at the same time when the electromagnetic valve 42 is opened, the compressed air supplied from the ring blower 31 becomes hot air of 80 to 90 ° C., for example. The hot air passes through the T-shaped pipe joint 22 and the nipple 37, the elbow 38, and the pipe 39 provided in the pipe shaft 9, and a plurality of holes 9 a in the pipe shaft 9.
Is discharged into the wire mesh 8.

Further, the sludge supply pump 2 is driven to open the electromagnetic valve 44 which is interlocked with the sludge supply pump 2 to open the sludge tank 7.
The sludge pumped from is sent to the pipe shaft 9 through the sludge supply pipe 23, the T-type pipe joint 22 and the sebel joint 20. The sludge sent to the pipe shaft 9 is, together with the hot air pressure-fed from the pipe 39 provided in the pipe shaft 9, a plurality of holes 9 a in the pipe shaft 9.
From inside the wire mesh 8 is attached. At this time, since the screw drum 3 is rotating in the direction of the arrow R, the spiral member 10 provided in a spiral shape allows the screw drum 3 to be uniformly attached to the inside of the wire net 8. Further, since the suction ring blower 30 of the water separation means 4 is driven, a negative pressure is generated on the sludge uniformly attached to the inside of the wire net 8, and the water can be separated from the sludge.

As a result, the sludge from which the water has been separated remains in the wire net 8 and the sucked water is guided to the gas-liquid separation box 28. At this time, since water and air are separated by the difference in the flow velocity caused by the difference between the volume ratio of the pipe 27 and the volume ratio of the gas-liquid separation box 28, the pipe 29 connected to the suction ring blower 30 contains only air. Are inhaled and released into the atmosphere. In the step of separating water from the sludge attached to the wire net 8, the sludge attached to the wire net 8 has a predetermined thickness, for example, 3
When the thickness becomes about 4 mm, the sludge supply pump 2 is stopped to close the electromagnetic valve 44 and stop the supply of sludge. After the sludge supply pump 2 is stopped, hot air is supplied into the wire net 8 for a predetermined time to fill the hot air in the wire net 8 to dry the sludge attached to the wire net 8. Sludge is wire mesh 8
In addition, since it adheres uniformly with a thickness that allows easy drying, the water content of the sludge can be approached to 0% without limit. Note that the hot air, after convection in the wire net 8, is discharged into the atmosphere from the exhaust port 11a provided in the disk 11.

When the drying is completed, the dried sludge is peeled off from the wire net 8, and the spiral member 10 provided on the screw drum 3 rotating in the direction of arrow R causes the discharge port 1 of the disc 11 to be discharged.
Guided to 1a, the dried sludge is discharged from the discharge port 11a. When the electromagnetic valve 42 of the pipe 35 is closed and the electromagnetic valve 43 of the pipe 40 is opened after discharging the dried sludge, the compressed air from the ring blower 31 which is still driven is pressure-fed to the pipe 41 via the pipe 40, and the compressed air is compressed. Are emitted from a plurality of holes 41 a formed in the pipe 41. This allows
At the same time that the dry sludge attached to the wire netting 8 is blown off, the fine particle dry sludge clogging the mesh of the wire netting 8 is also removed, and the spiral member 10 of the screw drum 3 rotating in the arrow R direction discharges the disk 11. The dried sludge is discharged from the discharge port 11a after being guided to 11a. When the electromagnetic valve 42 is closed, the heater 34 is de-energized, so that the heater 34 is not overheated.

One step of such a sludge treatment device 1 is 10 to 15 when the outside air temperature is low in winter, for example, at 3 ° C.
It can be processed in about a minute, and conversely, in summer when the outside temperature is high, one process can take about 5 minutes. In addition, in the present embodiment, in order to discharge the dried sludge from the inside of the screw drum 1, the sludge is discharged by the discharge port 11a provided in the spiral member 10 and the disk 11, but not limited to this, the dried sludge is discharged. Any discharging means can be used as long as it can be discharged from the screw drum 1.

Further, in this embodiment, the fixed pipe system and the rotating screw drum are connected by the sebel joint, but the present invention is not limited to this, and a rotary joint may be used. Furthermore, in the present embodiment, the wire mesh was used as the mesh material, but not limited to this, if sludge pumped from the sludge tank can be attached and water can be sucked from the attached sludge. A net made of heat-resistant plastic, rubber or the like may be used.

[0029]

As is apparent from the above embodiments, in the sludge treatment device of the present invention, the sludge pumped from the sludge supply means is dehydrated by the water separation means, and then the reticulated material is formed by the centrifugal separation action of the water separation means. Since the sludge uniformly attached to the sludge can be easily dried by the hot air from the compressed air superheating means, the water content of the sludge becomes infinitely close to 0%,
If 60 kg of excess sludge is treated, the dried sludge can be reduced to only 300 g, and even if 1 t of sludge is treated, it can be reduced to only 5 kg of sludge. This makes the treatment of the remaining sludge very easy.

By drying the sludge with hot air, all bacteria such as Escherichia coli can be killed, so that it is very hygienic and the odor peculiar to the sludge can be eliminated. Furthermore, when used in septic tanks used in school lunch centers, shopping centers, hotels, food processing, and other factories, the biological oxygen demand (N-BO
D), suspended solids (SS) and the like can be reduced, and vegetable debris and the like can be removed before being sent to the septic tank, so that the water treatment capacity of the septic tank can be maximized.

Further, since compressed air is used to wash the net-like material to which sludge adheres, the degree of contribution to water resources becomes very high.

[Brief description of drawings]

FIG. 1 is a perspective view showing an entire sludge treatment device of the present invention.

FIG. 2 is a partial detailed view of the sludge treatment device of the present invention.

FIG. 3 is an explanatory view showing a conventional sludge treatment device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sludge treatment device 2 ... Sludge supply pump (sludge supply means) 3 ... Screw drum (sludge projection means) 4 ... Moisture separation means 5 ... Compressed air supply means 6 ... Compressed air discharge means 7 ... Sludge tank 8 ... Wire mesh (reticulated) Material) 10 ... Helical member 11a ... Discharge port 34 ... Heater (compressed air overheating means) 42, 43 ... Solenoid valve (compressed air switching means) 44 ... Solenoid valve

Claims (4)

[Claims] 1. A sludge supply means for pumping sludge from a sludge tank, and a net material for projecting the sludge supplied from the sludge supply means by centrifugal force and for adhering the projected sludge are covered. Sludge projecting means, water separating means for separating water from the sludge adhering to the net material of the sludge projecting means by negative pressure, and the net material to which the sludge having water separated by the water separating means adheres Compressed air supplying means for supplying compressed air into the inside, compressed air superheating means for making the compressed air hot air when supplying the compressed air into the reticulated material by the compressed air supply means, and the compressed air superheating means After supplying the hot air from the inside of the reticulated material to which the sludge from which the water has been separated adheres, the compressed air supplied from the compressed air supply means to the outside of the reticulated material. Sludge treatment apparatus being characterized in that a compressed air release means for releasing toward the mesh material from. 2. A compressed air switching means for selectively supplying the compressed air supplied from the compressed air supply means to the compressed air heating means and the compressed air discharging means. The sludge treatment device according to 1. 3. The sludge treatment device according to claim 1, further comprising an electromagnetic valve that is interlocked with the sludge supply unit to selectively supply the sludge projecting unit with the sludge. 4. The sludge projecting means discharges the sludge spirally moved by the spiral member and a spiral member for spirally moving the sludge dried by the hot air from the compressed air superheating means. The sludge treatment device according to claim 1, wherein the sludge treatment device is provided.