JP2905203B1 - On-board drying device for sewage sludge and method of using the same - Google Patents

Abstract

An object of the present invention is to provide a compact and efficient drying apparatus that can be mounted on a vehicle or the like and moved. SOLUTION: The entire drying equipment is configured as a vehicle-mounted device, and is inclined upward from a dry powder supply port 14 below a cyclone 48 toward a mixture discharge port 28 above a crusher 38 of a flash dryer 36. Using the mixing feeder 12 of
The dewatered cake of sewage sludge is mixed with a large amount of dry sludge powder, and the mixture is pulverized by a flash dryer 36 equipped with a crusher 38 to increase the surface area and efficiently dried.
6, the exhaust gas from the gas turbine 40 is introduced as a heat source for drying, the electric power of the apparatus is supplied by a generator 42 connected to the gas turbine 40 (not shown), and the scrubber is treated by using the treated water of a sewage treatment plant. At 75, the dried exhaust gas is washed with water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drying apparatus which can be mounted on a vehicle or the like and used for drying sewage sludge generated by sewage treatment at a sewage treatment plant, and a method of using the same. In particular, the present invention relates to an on-board drying apparatus for sewage sludge suitable for allowing an organization having a plurality of sewage treatment plants to dispose of generated sewage sludge in a cyclic manner and a method of using the same.

[0002]

2. Description of the Related Art Conventionally, sewage sludge and the like have been dried by a dryer, and the obtained dried solids have been used as fertilizers and the like. However, in the prior art, it is used for drying sewage sludge and the like. As the dryer, for example, as shown in Japanese Utility Model Application Laid-Open No. 6-56693, a rotary kiln type dryer was generally used.

[0003]

In the rotary kiln type dryer described above, the sludge introduced into the dryer is granulated, and it is necessary to expose to a high temperature in order to increase the drying speed or to increase the residence time. For this reason, problems such as generation of an odor due to high-temperature drying and reduction in the treatment amount due to long-term stagnation have occurred.

[0004] In small and medium-sized sewage treatment plants that do not have a drying treatment facility, it is difficult to dispose of sewage sludge generated with sewage treatment. Sewage sludge generated at sewage treatment plants in
There is a demand for the development of a compact drying device that can be mounted on a vehicle or the like and moved since it can be circulated and processed individually by one device.

[0005] The present invention has been made in view of the above points, and an object of the present invention is to efficiently dry sewage sludge generated during sewage treatment in a sewage treatment plant, and to provide a plurality of sewage sludges. It is an object of the present invention to provide a compact on-board type drying apparatus capable of circulating a sewage sludge in a treatment plant with a single apparatus and a method of using the same.

[0006]

In order to achieve the above object, a vehicle-mounted drying apparatus for sewage sludge according to the present invention is provided with a dried sludge powder circulated by being separated into a solid and a gas by a dust collector (for example, cyclone). Is supplied from a dry powder supply port, and the supplied dry sludge powder is transported by a conveying means (for example, a screw feeder).
The sludge dewatered cake is supplied from the dewatering cake supply port to the dried sludge powder conveyed diagonally upward by the dewatering cake supply port, and the supplied sludge dewatered cake is mixed and conveyed (for example, the peripheral portion is cut off). While mixing with dry sludge powder by screw feeder with screw of shape),
Further, the mixture of the sludge dewatered cake and the dried sludge powder, which is conveyed diagonally upward and is conveyed diagonally upward, is discharged from the mixture discharge port, from the dry powder supply port below the dust collector (eg, cyclone). Activated carbon (powder activated carbon) is supplied to a mixing feeder having a structure inclined upward toward the mixture discharge port on the upper side of the crusher of the flash dryer and a dry sludge powder or a mixture of sludge dewatered cake and dry sludge powder. Activated carbon supply means connected to a mixing feeder (for example, comprising an activated carbon storage tank and an activated carbon feeder), and a dry sludge powder transported by a transporting means (for example, a screw feeder) of the mixing feeder. A dry powder hopper provided in communication with the upper part of the mixing feeder for taking out and storing a part thereof, and a circulating exhaust gas in which at least a part of the combustion exhaust gas is circulated by being separated into solid and gas by a dust collector. In addition, a gas turbine generator in which a gas turbine used as exhaust gas for drying of a flash dryer and a generator are connected, and a sludge dewatered cake from a mixture outlet, dried sludge powder, and activated carbon (powder activated carbon) The mixture outlet of the mixing feeder, in which the mixture is introduced into the crusher together with the drying exhaust gas, and the mixture is dried while being crushed (crushed), further dried through a flash drying tube, and transported upward by airflow. Flash dryer with a crusher arranged and connected underneath and dried sludge powder from the flash dryer (including activated carbon)
A dust collector (for example, a cyclone) arranged and connected above the dry powder supply port of the mixing and feeding device for introducing a gas at the outlet of a flash dryer containing air and performing solid-gas separation. A part of the dust collector outlet gas separated into solid and gas is circulated as a circulating exhaust gas together with the combustion exhaust gas of the gas turbine to the flash dryer, and the remainder of the dust collector outlet gas is washed with a water-washing type exhaust gas treatment device (eg, a scrubber). ) And a water-cleaning type exhaust gas treatment device for introducing treated water treated in a sewage treatment plant to remove dust and deodorize exhaust gas from the exhaust gas fan from the exhaust gas fan (for example, Scrubber) (see FIG. 1).

[0007] In the above-mentioned on-vehicle type drying apparatus of the present invention,
It is preferable to supply necessary electric power to the apparatus by a gas turbine generator, that is, to provide an independent / cogeneration (combined heat and power) type apparatus equipped with a gas turbine generator. Further, in the above-mentioned on-board drying apparatus of the present invention, a dry powder discharging device (for example, a screw feeder) is provided in the dry powder hopper, and a molding machine for forming dry sludge powder in the dry powder discharging device. (For example, an extrusion type continuous molding machine) is preferably connected. The method of using the on-vehicle type drying apparatus for sewage sludge of the present invention includes mounting the drying apparatus on a vehicle such as a truck, traveling around a plurality of sewage treatment plants that do not have a drying treatment facility, and in each sewage treatment plant. The sewage sludge generated is individually dried to produce fertilizer. The dried sewage sludge may be used as fuel or the like, or the dried sludge may be carbonized and activated and used as activated sludge as a substitute for activated carbon. Therefore, activated carbon in the present invention also includes sludge activated carbon.

[0008]

FIG. 1 shows an on-board drying apparatus for sewage sludge according to an embodiment of the present invention. In the present embodiment, using a mixing feeder having an inclined structure, a dewatered cake of sewage sludge is mixed with a large amount of dry sludge powder, and the surface area of the mixture is efficiently increased by a flash dryer equipped with a crusher. The entire drying equipment is configured as a vehicle-mounted device, and the flue gas from the gas turbine is introduced as a drying heat source for the flash dryer, so that the power of the device is supplied by the gas turbine generator. In addition, the drying exhaust gas is washed with water using the treated water of a sewage treatment plant.

As shown in FIG. 1, a sewage sludge dewatered cake stored in a sludge hopper (not shown) of a sewage treatment plant is supplied from a dewatered cake supply port 10 into a mixing and feeding machine 12. On the other hand, the circulated dry powder of sewage sludge (hereinafter referred to as dry sludge powder) supplied from the dry powder supply port 14 is conveyed obliquely upward in the mixing and feeding machine 12 by the conveying means 16 such as a screw feeder and dried. A part of the sludge powder is transferred
6 The water is blocked by a resistance member such as a baffle plate (baffle plate) 20 provided below the dried sludge hopper 18 on the downstream side, and is stored in the dried sludge hopper 18 provided in communication with the upper side of the mixing feeder 12. The remaining portion of the dried sludge powder conveyed by the conveying means 16 is mixed with the sludge dewatered cake supplied from the dewatered cake supply port 10. Here, the mixing ratio of the dried sludge powder to the sludge dewatered cake is 10 to 500 times, preferably 50 to 200 times, the dry weight ratio. In addition, powdered activated carbon is supplied from the activated carbon storage tank 22 to the dried sludge powder in the mixing and feeding machine 12 in the middle of the conveying means 16 by an activated carbon feeder (for example, a rotary feeder) 24, and deodorizing treatment is performed. Activated carbon may be supplied to the powder after mixing with the sludge dewatered cake, after crushing (crushing) and after drying.

The sludge dewatered cake, the dried sludge powder, and the powdered activated carbon are conveyed further obliquely upward through the mixing / supplying machine 12 while being mixed by the mixing / conveying means 26 such as a screw feeder, and discharged from the mixture discharge port 28. Is done. The mixing / transporting means 26 has a structure having both a mixing function and a transport function. For example, a screw feeder having a screw with a cut-out peripheral portion is used. Reference numeral 30 denotes a drive shaft of the transport unit 16 and the mixing / transport unit 26, and reference numeral 32 denotes a motor for rotating the drive shaft 30. The sludge mixture discharged from the mixture discharge port 28 is introduced into a crusher (for example, a cage mill) 38 of a flash dryer 36 via a mixture transport pipe 34. Crusher 38
, A part of the combustion exhaust gas of the gas turbine 40 is introduced,
This is used as a heat source of the exhaust gas for drying. The generator 42 connected to the gas turbine 40 is not shown, but the obtained electric power is used as a component of the on-vehicle equipment (for example, a mixing feeder, a crusher, an exhaust gas fan, a molding machine, and the like).
It is supplied to. Details of these will be described later.

[0011] The pulverizer 38 mechanically pulverizes finely (crushing).
The dried sludge powder dried by the exhaust gas for drying is
The air is conveyed through the flash drying tube 44 of the flash dryer 36 and further dried with hot air. The dried sludge powder from the flash drying pipe 44 is introduced into a cyclone (for example, a tangential inflow cyclone) 48. The dried sludge powder on the solid side which has been solid-gas separated in the cyclone 48 is extracted from the lower part of the cyclone 48,
It is circulated to the dry powder supply port 14 of the mixing and supplying machine 12. The dried sludge powder that has been conveyed obliquely upward in the mixing feeder 12 by the conveying means 16 and stored in the dry sludge hopper 18 is:
The dry sludge hopper 18 is provided by a dry powder discharging means 50 such as a screw feeder provided in the dry sludge hopper 18.
The dried sludge is discharged into the molding machine 54 through the dried matter discharge pipe 52, and is used as fertilizer, fuel, and the like as a dried sludge molded article. Further, the powdery dry sludge from the dry matter discharge pipe 52 can be extracted as it is and used as fertilizer, fuel and the like. Reference numeral 56 denotes a motor for rotating the drive shaft of the dry powder discharging means 50. As an example of the molding machine 54, a plurality of cylinders are rotated along the inner surface of a short tube portion having a large number of small holes, and a small columnar (crayon) molded product is extruded from the large number of small holes. An extrusion-type continuous molding machine having the configuration described above is used.

As described above, the dried sludge powder which is not stored in the dried sludge hopper 18 and is conveyed obliquely upward in the mixing / supplying machine 12 is mixed with the sludge dewatered cake from the dewatered cake supply port 10, and the airflow is reduced. It is circulated and used for pulverization and drying in the dryer 36. On the other hand, the dried exhaust gas on the gas side which has been solid-gas separated by the cyclone 48 is extracted from the upper part of the cyclone 48, and is introduced into an exhaust gas fan (for example, a turbo blower) 60 through an exhaust gas conduit 58. As can be seen from the positional relationship shown in FIG.
A cyclone 48 is arranged above the dry powder supply port 14 of
And the crusher 38 of the flash dryer 36 is arranged and connected below the mixture discharge port 28 of the mixing feeder 12, so that the structure of the mixing feeder 12 is
4 to the mixture discharge port 28, the cyclone 48 and the flash dryer 36
The space can be effectively used while securing the installation space such as the above, and the device can be made compact.

A part of the drying exhaust gas (cyclone outlet gas) introduced into the exhaust gas fan 60 is mixed with the combustion exhaust gas (for example, about 500 ° C.) of the gas turbine 40 and temperature-adjusted. The mixture is introduced into the transport pipe 34 and introduced into the crusher 38 together with the sludge mixture from the mixture discharge port 28. The temperature of the drying exhaust gas is monitored by a thermometer 62 provided in an exhaust gas conduit 72 connected to the mixture transport pipe 34, for example, to about 300 ° C. In this case, the temperature of the drying exhaust gas indicated by the thermometer 64 provided in the flash drying pipe 44 is, for example, about 80 to 120 ° C., and the temperature of the dried sludge powder dried to a water content of about 20% or less is It only goes up to about 70 ° C. Odor generation is significantly suppressed by such low-temperature drying. Also, SOx and NOx are not generated. Furthermore, the moisture content of the dried sludge powder is about 20% or less, and the generation of mold and the like is greatly suppressed. In addition, the exhaust gas fan 6
0 is connected to a current indicating controller 66. When the amount of circulating exhaust gas to the exhaust gas fan 60 increases and the output (current value) increases, a signal from the current indicating controller 66 is provided in the exhaust gas conduit 68. By closing the control valve (for example, control damper) 70, the amount of gas flowing into the exhaust gas conduit 72 through which the combustion exhaust gas from the gas turbine 40 flows is reduced. Conversely, when the amount of exhaust gas circulated to the exhaust gas fan 60 decreases, the control valve 70 is opened to increase the amount of gas mixed with the combustion exhaust gas.

In addition, of the dried exhaust gas from the exhaust gas fan 60, except for those circulating by flowing from the exhaust gas conduit 68 to the exhaust gas conduit 72, a scrubber 75 is provided from the exhaust gas conduit 74.
To be dedusted and deodorized. A temperature indicating controller 76 is connected to the exhaust gas conduit 74. When the temperature of the exhaust gas decreases, a signal from the temperature indicating controller 76 opens a control valve (for example, a control damper) 78 to open the exhaust gas conduit 7.
The amount of gas flowing into the exhaust gas conduit 40 is increased, and as a result, the amount of gas flowing into the exhaust gas conduit 68 is reduced. By decreasing the amount, the amount of combustion exhaust gas flowing from the gas turbine 40 to the exhaust gas conduit 72 is increased, and the temperature of the drying exhaust gas introduced into the mixture transport pipe 34 is increased. Conversely, when the temperature of the exhaust gas increases, the control valve 78 is closed to increase the amount of low-temperature gas mixed with the combustion exhaust gas. As described above, the control valve 70 controlled by a signal from the current indicating controller 66 and the control valve 78 controlled by a signal from the temperature indicating controller 76 cause the mixture to be introduced into the crusher 38 from the mixture conveying pipe 34. The temperature and flow rate of the drying exhaust gas are controlled within a certain range.

On the other hand, the flue gas introduced into the crusher 38 as a heat source of the flue gas for drying uses the flue gas of the gas turbine 40 as described above, and the fuel in which fuel such as kerosene is stored. Fuel is supplied from the tank 80 to the combustor 84 of the gas turbine 40 by the fuel pump 82, the gas turbine 40 is driven by the combustion exhaust gas, and a part of the combustion exhaust gas is sent from the exhaust gas conduit 86 to the exhaust gas conduit 72. The remainder of the combustion exhaust gas from the gas turbine 40 is discharged out of the system together with the dried exhaust gas that has been subjected to the dust removal and deodorization treatment by the scrubber 75. Further, since the gas turbine 40 has a large amount of exhaust gas, a gas turbine having a small capacity can be used, and the apparatus becomes compact. It should be noted that the gas turbine generator is as compact as about 1/2 in weight and about 2/3 in size as compared with a diesel engine of the same capacity. The power generator 42 connected to the gas turbine 40 is not shown, but the obtained electric power is supplied to the components of the on-vehicle equipment (for example, a mixing and feeding machine, a crusher, an exhaust gas fan, a molding machine, and the like). It is being supplied. Also, the generator 4
The control valve 92 provided on the dewatering cake supply pipe 90 is opened and closed by a signal from a control panel 88 connected to the dewatering cake 2 to process the sludge dewatered cake supplied to the dewatering cake supply port 10 of the mixing and feeding machine 12. Etc. can be controlled. A gas turbine control panel 94 is connected to the control panel 88 so that the amount of fuel supplied from the fuel pump 82 and the amount of combustion in the combustor 84 can be controlled by a signal from the gas turbine control panel 94. Has become.

As described above, a part of the dried exhaust gas from the exhaust gas fan 60 is supplied from the exhaust gas conduit 74 to the scrubber 7.
Sent to 5. In the scrubber 75, for example, fillers 96 and 98 having a mesh structure are provided, and a mist eliminator 100 is provided on the outlet side of the scrubber 75. On the upstream and downstream sides of the fillers 96 and 98 in the scrubber 75, nozzles 102, 104 and 106 for continuously spraying water for washing are provided, and the mist eliminator 100 in the scrubber 75 is provided. On the upstream side, a nozzle 108 for intermittently spraying water for cleaning is used.
Is provided. As described above, the exhaust gas introduced into the scrubber 75 generates little odor due to low-temperature drying, does not generate SOx and NOx, and does not contain other harmful components. Exhaust gas treatment can be performed, and treated water treated in a sewage treatment plant can be used as washing water. That is, the nozzles 102, 1
The treated water is continuously supplied to the scrubber 75 and the exhaust gas is washed with water, and the exhaust gas is passed through the fillers 96 and 98 to remove dust and deodorize. The mist is removed through the eliminator 100 and the mist eliminator 100 is
Cleaning is performed by supplying treated water intermittently. The exhaust gas passing through the mist eliminator 100 is discharged out of the system together with a part of the combustion exhaust gas from the gas turbine 40.

The compact on-board drying apparatus described above can be mounted on a vehicle such as a truck. For example, the throughput of sludge dewatered cake is 400 kg / hr.
Can be mounted on a truck having a loading weight of 12 tons and a total weight of 25 tons. The drying apparatus of the present invention is mounted on a vehicle such as a truck, and tours a plurality of small and medium-sized sewage treatment plants that do not have a drying treatment facility, and separately performs sewage sludge generated at each sewage treatment plant. Manufacture of fertilizers and the like can meet the needs of each treatment plant for reducing the volume and effective use of sludge waste. In addition, this makes it possible for an organization or the like having a plurality of sewage treatment plants to dispose of the generated sewage sludge in a cyclic manner. In addition, it is also possible to use the dried sewage sludge as fuel or the like. Further, the dried sludge produced by the apparatus of the present invention has low odor and the like due to low-temperature drying, and since activated carbon is added, most of the odor components are adsorbed and removed. Therefore, it is suitable for use as a fertilizer or the like. Further, the dried sludge produced by the apparatus of the present invention can be carbonized and activated using a stationary carbonization apparatus to produce a substitute for activated carbon (sludge activated carbon). In this case, in the embodiment of the present invention, the sludge activated carbon may be supplied to the activated carbon storage tank 22 and added to the dried sludge powder in the mixing and feeding machine 12 from the activated carbon feeder 24. The present invention can be applied to human waste sludge, livestock waste, waste from various industrial wastewaters, and the like, in addition to sewage sludge.

[0018]

As described above, the present invention has the following effects. (1) A dust collector such as a cyclone is arranged and connected above the dry powder supply port of the mixing feeder, and a crusher of a flash dryer is arranged and connected below the mixture discharge port of the mixing feeder. In the configuration, since the mixing feeder has a structure inclined upward from the dry powder supply port toward the mixture discharge port,
The space can be effectively used while securing the installation space for a dust collector such as a cyclone and a flash dryer, and the device can be made compact. (2) The dewatered cake of sewage sludge is mixed with a large amount of dry sludge powder, and the mixture is mechanically pulverized and dried by a flash dryer equipped with a crusher. Can be. Further, since the temperature of the dried sludge powder rises only to about 70 ° C., generation of odor and the like is largely suppressed. Further, no exhaust gas such as SOx and NOx is generated. Further, the moisture content of the dried sludge powder can be reduced to about 20% or less, and the generation of mold and the like can be greatly suppressed. (3) This is a stand-alone / cogeneration (combined heat and power) type device equipped with a gas turbine generator that supplies combustion exhaust gas from a gas turbine as a heat source for exhaust gas for drying in a flash dryer and is connected to the gas turbine. The required power can be supplied to the device by the generated generator. Also,
Since the gas turbine generates a large amount of exhaust gas and can use a small-capacity gas turbine, the apparatus becomes compact. (4) Since the drying process is performed at a low temperature, the exhaust gas to be treated contains almost no odor components and the like.
Since neither Ox nor NOx is contained, exhaust gas treatment can be performed only by dust removal and deodorization by water washing. In addition, as the washing water uses the treated water treated at the sewage treatment plant,
Exhaust gas used for drying sludge generated at sewage treatment plants
It can be treated using treated water from the same sewage treatment plant,
Very efficient. (5) The compact on-board drying device of the present invention can be mounted on a vehicle such as a truck. The apparatus of the present invention is mounted on a truck or the like, and tours a plurality of small and medium-sized sewage treatment plants that do not have a drying treatment facility. If it is manufactured, the drying treatment facilities at a plurality of sewage treatment plants can be covered by one device, and furthermore, the needs of each treatment plant for reducing the volume and effective use of sludge waste are met. be able to. In addition, this makes it possible for an organization or the like having a plurality of sewage treatment plants to dispose of the generated sewage sludge in a cyclic manner.

[Brief description of the drawings]

FIG. 1 is a systematic schematic configuration diagram showing an on-board drying device for sewage sludge according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Dehydration cake supply port 12 Mixing supply machine 14 Dry powder supply port 16 Transport means 18 Dry sludge hopper 20 Baffle (baffle plate) 22 Activated carbon storage tank 24 Activated carbon feeder 26 Mixing / transport means 28 Mixture discharge port 30 Drive shaft 32, 56 Motor 34 Mixture conveying pipe 36 Airflow dryer 38 Crusher 40 Gas turbine 42 Generator 44 Airflow drying pipe 48 Cyclone 50 Dry powder discharge means 52 Dry substance discharge pipe 54 Molding machine 58, 68, 72, 74, 86 Exhaust gas conduit 60 Exhaust gas fan 62,64 Thermometer 66 Current indicating controller 70,78,92 Control valve 75 Scrubber 76 Temperature indicating controller 80 Fuel tank 82 Fuel pump 84 Combustor 88 Control panel 90 Dewatering cake supply pipe 94 Gas turbine control panel 96, 98 Filler 100 Mist eliminator 102 104, 106, 108 nozzle

──────────────────────────────────────────────────続 き Continuing on the front page (72) Masakazu Sawai 1-3-1 Higashikawasakicho, Chuo-ku, Kobe Kawasaki Heavy Industries, Ltd. Kobe Head Office (72) Shuichiro Hatakeyama 1-1-1, Higashikawasakicho, Chuo-ku, Kobe No. 3 Kawasaki Heavy Industries, Ltd. Kobe Head Office (56) References JP-A-4-27499 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C02F 11/12 C02F 11/00 F26B 5/16

Claims (4)

(57) [Claims] 1. A dry sludge powder, which is separated by a dust collector and solid-gas separated and circulated, is supplied from a dry powder supply port, and the supplied dry sludge powder is conveyed obliquely upward by a conveying means. The sludge dewatered cake is supplied to the conveyed dry sludge powder from the dewatering cake supply port, and the supplied sludge dewatered cake is mixed with the dried sludge powder by the mixing / conveying means, and is further conveyed diagonally upward and diagonally upward. The mixture of the sludge dewatered cake and the dried sludge powder conveyed to the outlet is discharged from the mixture discharge port. From the dry powder supply port on the lower side of the dust collector to the mixture discharge port on the upper side of the crusher of the flash dryer. A mixing feeder having a structure inclined upward, activated carbon supply means connected to the mixing feeder for supplying activated carbon to the dried sludge powder or a mixture of the sludge dewatered cake and the dried sludge powder; Transported by the transport means A dry powder hopper connected to the top of a mixing feeder for taking out and storing a part of the dried sludge powder, and at least a part of the combustion exhaust gas is separated into solid and gas by a dust collector and circulated. Gas turbine generator connected to a gas turbine and a generator used as drying exhaust gas for a flash dryer together with the circulating exhaust gas that flows, and a mixture of sludge dewatered cake, dried sludge powder, and activated carbon from the mixture outlet Is introduced into a crusher together with the exhaust gas for drying, and the mixture is pulverized and dried while being pulverized, further dried through a flash drying tube, and conveyed upward by a stream. A flash dryer in which a crusher is arranged and connected, and a dry powder supply port of a mixing feeder for performing solid-gas separation by introducing gas from the flash dryer containing dry sludge powder from the flash dryer Place on top A connected dust collector, and a part of the dust collector outlet gas separated into solid and gas by the dust collector is circulated as a circulating exhaust gas together with the combustion exhaust gas of the gas turbine to the flash dryer, and the exhaust gas of the dust collector outlet gas is discharged. An exhaust gas fan for introducing the remaining part to a water-cleaning type exhaust gas treatment device, and a water wash for introducing treated water treated in a sewage treatment plant to remove dust and deodorize exhaust gas from the exhaust gas fan from the exhaust gas fan An on-board drying device for sewage sludge, comprising: a waste gas treatment device. 2. The on-board drying apparatus for sewage sludge according to claim 1, wherein a necessary power is supplied to the on-board drying apparatus by a gas turbine generator. 3. The dry powder hopper is provided with a dry powder discharge means, and the dry powder discharge means is connected to a molding machine for forming a dry sludge powder. On-board drying device for sewage sludge. 4. The apparatus according to claim 1, 2 or 3, which is mounted on a vehicle, travels around a plurality of sewage treatment plants that do not have a drying treatment facility, and individually separates sewage sludge generated at each sewage treatment plant. A method for using an on-board drying device for sewage sludge, comprising drying and producing a fertilizer.