JPH0741268B2 - Sludge treatment method and apparatus - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating sludge and an apparatus therefor, and more specifically, it includes leftover rice produced in the manufacturing process of the food industry, and water-containing substances such as leftover rice containing organic sludge due to residues such as residue. TECHNICAL FIELD The present invention relates to a sludge treatment method and apparatus for dehydrating a plate-shaped dehydrated cake, which is further fried to remove water and incinerate.

[0002]

2. Description of the Related Art Conventionally, as a method for treating residue sludge such as leftover food and residue, it is dehydrated with a dehydrator to form a cake, and the cake-like organic sludge is mixed with cow dung, chicken dung, sawdust, etc. The method of composting and processing and the method of drying and incinerating it were general. However, the composting of the dehydrated cake sludge is outsourced to a specialist such as a compost center, but due to the nature of the dehydrated cake in which fine particles are compressed, it is difficult to compost only the cake. It is necessary to mix cow dung or sawdust (remains of mushroom cultivation). Furthermore, the amount of this treatment continues to increase, and the cost of consignment is increasing year by year with the surplus of the treatment company, and depending on the distance to the treatment site, there are cases where the company does not undertake it. In addition, in the method of mixing sludge and leftover food and combusting in an incinerator, it is dried in the furnace and incinerated sequentially from the dried part, which requires a long time and is quite large and expensive for large-scale processing. There is a problem that various equipment is required, and in the method of burning in an incinerator after drying with another dryer, the cake in the state where the fine particles are compressed has poor air permeability and is stirred. It takes a long time and has a problem that it causes a pollution problem because it produces a bad odor during the drying process except for the sealing and drying. Therefore, we will examine these problems.
In order to turn the organic sludge into a solid fuel, the organic sludge is dehydrated.
Screw press dehydrator and dehydration obtained by the dehydrator
A screw extrusion granulator for pelletizing the cake,
Contact tank for contacting pellets obtained with a granulator with hot oil
And pellets in the suspension oil flowing out of the contact tank
A device with a screen for separating the
(For example, see Japanese Utility Model Publication No. 2-26920).

[0003]

THE INVENTION It is a problem to be solved point the way, the real fair 2
-The fueling device according to No. 26920 pelletizes the dehydrated cake.
Indispensable screw extruder and granulator
And the pellets are contacted with hot oil in a contact tank
In the suspension oil of pellets flowing out from the contact tank
No heat-resistant screen to separate pellets in
It is lacking, therefore, the entire device becomes large and the equipment cost
There was a problem that

The present invention has been made in view of the above problems of the prior art, and an object thereof is a screw extrusion for pelletizing a dehydrated cake.
Pelletizer or pellets for separating pellets in suspended oil
Compact by eliminating the need for a screen
The sludge can be efficiently and economically
Providing sludge treatment method and equipment that can be incinerated continuously
To do.

[0005]

[Means for Solving the Problems] To this end, the present invention provides: (a) A residue sludge such as leftover rice is stirred with a coagulant in a reaction tank.
First step of mixing to produce aggregate sludge (b) The aggregate sludge is converted into an endless form in a dehydrator.
Suction blower while being transferred by suspended filter cloth
Is driven by a vacuum hopper and gravity dehydrated.
To form a cake layer, which is then applied to the filter cloth.
By the main drum and pressure roller while being transferred further
Second step (c) of dehydration under pressure to form a dehydration cake. The dehydration cake is an oil tank in a continuous frying machine.
Transfer of the dehydrated cake from the charging side to the discharging side
It is heated to 160-180 ℃ while being transferred by the mechanism.
The water contained in the oil chamber is allowed to evaporate the water content and
While being drained through the
The third step (d) is sent out by incinerating the fried product in an incinerator.
The present invention is characterized in that the composition of each step of the fourth step is agitated such that the residue sludge such as leftover food and the coagulant are agitated and mixed.
The reaction tank inside the machine is connected to the reaction tank, and
Agglomerate sludge produced by the above process is dehydrated into a dehydrated cake
The dehydrator and the dehydrator case that is installed and put in series with the dehydrator.
Is emptied by passing through the heated waste oil
Continuous frying machine as a bald formation, and continuous installation with the continuous frying machine
And the fried product is incinerated.
The dehydrator is suspended between a plurality of rotating rollers.
Endless filter cloth and the charge chute on the surface of the filter cloth.
The cake sludge is gravity-dewatered from the reaction tank
Layered suction blower and vacuum hopper
And transfer the cake layer on the filter cloth surface that was gravity dehydrated.
From the main drum that is dehydrated under pressure to form a dehydrated cake.
And multiple pressure rollers and the dehydrated cake is scratched from the filter cloth surface.
With a scraper, the continuous frying machine has a rectangular shape
The oil chamber formed in the longitudinal direction of the oil tank and the smell in the waste oil in the oil chamber
And progress from the input side of the dehydrated cake to the discharge side
To evaporate the water content of the dehydrated cake and pass it through the outside of the oil chamber.
The dehydrated cake is continuously fried to remove the oil.
The transfer mechanism that takes a shape and the waste oil in the oil chamber is heated to a predetermined
Characterized by having a heating means for maintaining the temperature of
It is a thing.

[0006]

The method and apparatus according to the present invention have the above-mentioned structure, and sludge treatment by the method is performed as follows. Organic sludge generated in the manufacturing process of the food industry, sludge containing water, sludge, etc. are temporarily stored in a sludge tank, and then injected from the sludge tank into the reaction tank at the same time as the coagulant from the coagulant dissolution tank, and mixed by stirring. As a result, aggregate sludge is generated. The aggregate sludge is introduced into a dehydrator, and is preliminarily gravity-dehydrated on the rotating filter cloth surface to be transferred while forming a cake layer, and is transferred to the main drum, the first pressure roller, and the second pressure roller. It is dehydrated under pressure by a roller and a drive roller, and taken out as a plate-shaped dehydrated cake having a water content of about 85%.
Then, the dehydrated cake taken out is put into a continuous frying machine. The oil chamber of the continuous fryer has a predetermined amount of edible oil used as a waste oil reuse that cannot be reused due to used stains in food processing or oxidation, and is preferably 160 by a gas burner arranged on the bottom of the oil tank pot. The dehydrated cake that has been heated to ℃ is passed through a heated oil while being transferred by a conveyor, and the moisture content is evaporated by the action of the heated oil to form a fried form. It becomes a shaped article and is incinerated alone or together with other incinerators in the next incinerator.

[0007]

EXAMPLES Examples will be described with reference to the drawings.
FIG. 1 is a system diagram of an example of a treatment apparatus according to the present invention, in which sludge, mainly organic sludge caused by leftovers such as leftover food and residue produced in the food industry, is stored in a sludge tank 1 and supplied from the sludge tank 1. The mud pump 2 supplies mud to the reaction tank 3. On the other hand, in the flocculant dissolving tank 4, a fixed amount of water and a flocculant (ferric chloride solution)
Is completely mixed by a stirrer 5 to obtain a coagulant having a predetermined concentration, and is injected into the reaction tank 3 simultaneously with the sludge from the sludge tank 1 by the chemical injection pump 6 and sufficiently stirred by the stirrer 7 in the reaction tank 3. Aggregate sludge is produced by mixing, the aggregate sludge is pumped through a pipe by a pump, introduced into the dehydrator 10, and dehydrated by the dehydrator 10 to form a plate-shaped dehydrated cake B.

[0008] The dehydrator 10 contains aggregate sludge with a water content of 85%.
It is dehydrated and taken out as a dehydrated cake, and its schematic configuration is shown in FIGS. 2 to 4. To explain further,
In these figures, both side arm portions 12 of the box-shaped machine casing 11 are shown.
The main drum 13 is rotatably supported in the meantime,
A first pressure roller 14, a second pressure roller 15 and a drive roller 16 for pressing a filter cloth, which will be described later, are rotatably supported by the main drum 13 so that each pressure roller 14,
15 are provided with pressure adjusting levers 17 and 18, respectively, and by operating these levers 17 and 18 and the pressure handle 19, the pressing force of the filter cloth against the main drum 13 can be finely adjusted. Has become. The drive roller 20 and the drive roller 2 are also provided in the machine casing 11.
The driven roller 21 that is diagonally higher than 0 and the tension roller 21 that is diagonally lower than the drive roller 16
Are rotatably supported by the rollers 20, 2
A filter cloth 23, such as a synthetic woven cloth, is suspended in an endless manner between 1, 14, 15, 16 and 22 so that the filter cloth 23 receives the rotational force of the drive roller 20 by a drive motor 24. The filter cloth 23 is preferably rotated at a rotational speed of 2.4 to 9.6 m / min, and the tension of the filter cloth 23 can be finely adjusted by operating the attached filter cloth tension lever 25. Further, the machine 11 is provided with a charge chute 26 and a charge chute elevating lever 27. The aggregate sludge from the reaction tank 3 is supplied to the charge chute 26 and is rotated by the operation of the pressure adjusting lever 27. The accumulated sludge is charged on the filter cloth 23, and the agglomerate sludge is preliminarily superposed by the operation of the suction blower 28 by the action of the vacuum hopper 29 arranged below the filter cloth portion between the driving roller 20 and the driven roller 21. /> The filtrate, which has been dehydrated by force, is connected by a line 30 to a gas-liquid separator 3
The water is separated into water and air in the apparatus 1, and the water is used as the washing water for the washing shower 33 of the filter cloth 23 through the filtrate circulation device 32, and the air is discharged.
Aggregates sludge charged shoots on the filter cloth 23 as described above, is gravity dehydrated with portions of the vacuum hopper 29, it is transported while forming a cake layer A to the filter cloth 23 side which is rotating main The drum 13 and the first pressure roller 14 and the second pressure roller 15 perform pressure dehydration,
Further, it is strongly dehydrated by the drive roller 16 (water content of about 8
5%), and the plate-shaped caked dehydrated cake B is scraped off by the scraper 34 and automatically charged into the next continuous frying machine 40 from the cake chute 35.

The continuous frying machine 40 passes the heated dehydrated cake B through the heated oil to form a frying-like formation in a frying-like state, and its schematic configuration is shown in FIGS. 5 and 6. There is. FIG. 5 is a plan view and FIG. 6 is a side view. In these figures, the oil tank 41 is a rectangular box shape, and the oil in the oil chamber 42 formed in the longitudinal direction thereof is filled with the dehydrated cake B. The transfer mechanism 4 that advances from the input side 43 toward the output side 44
5 are provided. More specifically, in the oil in the oil chamber 42, a drive sprocket in which a conveyor 46 composed of a large number of conveyor plates 47 moving from the input side 43 toward the output side 44 is rotatably mounted on the oil tank portion of the input side 43. 48 and the oil tank portion of the lead-out side 44 , and drive sp
Below the driven sprocket 49 and the oil chamber 42 which are rotatably mounted at a position higher than the rocket 48 (bottom of the oil tank)
And is endlessly suspended between the intermediate sprockets 50 and 51, which are rotatably mounted on the input side and the output side, respectively, and the punching plate is provided on the conveyor 46 at a predetermined interval. A conveyor feed plate 52 is provided upright so that the conveyor 46 is transferred and rotated by a drive sprocket 48 that is rotated by receiving the rotational force of the drive source 53, and the dehydrated cake B is put into oil from the input side 43. While being transferred by the feed plate 52 of the conveyor 46, fried in a fried form and passed through the outside of the oil chamber to remove the oil.
While being discharged, it is led out from the chute 54 on the lead-out side 44 as a fried-like formation C and put into the next incinerator. In addition,
The speed of the conveyor 46 can be appropriately adjusted by the transmission 55 and can be driven according to the rotation speed of the filter cloth 23 of the dehydrator 10. Further, the oil put in the oil chamber 42 is preferably edible oil for reuse of waste oil that has been used in food processing and cannot be reused due to oxidation or the like.

A plurality of gas burners 56 are arranged below the oil chamber 42 in the oil tank 41 (oil tank pan bottom), and
The gas pipe 57 of these gas burners 56 is a gas cock 5.
8, automatic temperature regulatory thermo valve 59, is connected to the gas inlet pipe 62 via a branch pipe 61 having a seed fire cock 60 and the like,
The heat source gas supplied from the connection port 63 of the gas introduction pipe 62 heats the oil (for example, 90 liters) put in the oil chamber 42 with the gas burner 56 to 160 to 180 ° C., and this heating temperature is controlled by an automatic temperature control thermostat. It is designed to be held constant by the valve 59.

The formation C fried by the continuous frying machine 40 is reduced to about ⅕ of the dehydrated cake B, put into an incinerator, preferably a combustible incinerator 70, and is used alone.
Or it is incinerated together with other incinerated materials. Since the combustible incinerator 70 has a known structure including an oxygen blowing unit, a cooling unit for the incinerator, etc., illustration and description of its configuration will be omitted.

[0012]

According to the present invention, however, a large amount of water content is evaporated in a short time by the action of oil heated by the dehydrated cake dehydrated by the dehydrator to a water content of about 85% through a continuous fryer. Since this is an emptied product and is incinerated in an incinerator , it is indispensable for conventional equipment.
Extrusion for pelletizing dried dehydrated cake
Granulator or for separating pellets in suspended oil pellets
Since the screen is unnecessary, the entire device can be made compact.
It is possible, construction cost is low, maintenance is easy, and it is economical.

Further , according to the present invention, the sludge in the form of a dehydrated cake and scraped off by a scraper is fried in a continuous frying machine and then fried to form a fried product. Therefore, this method of removing moisture containing the fried product allows continuous treatment for a short time, does not cause a bad odor, and the fried product is dyed with oil. > for Nde seen write a state of crisp, flammability is extremely high, the exhaust gas pollution caused by air pollution at the time of incineration
There is no problem. Further, the furnace becomes high temperature extremely high damage combustibility, leftovers, hydrate such Zansai can also easily simultaneous incineration.

Further , according to the present invention, since it is incinerated as a fried product, it is easy to incinerate, and it is not necessary to install an incombustible incinerator which requires an excessive cost, and a combustible incinerator is required. It is economical because it can be incinerated sufficiently, the installation area can be saved , and the oil is a reuse of waste oil, so there is no cost, and maintenance costs are only due to the gas cost of the heat source. It is economical and economical.

[Brief description of drawings]

FIG. 1 is a system diagram of an example of a processing apparatus according to the present invention.

FIG. 2 is a schematic side view of a dehydrator.

FIG. 3 is a schematic rear view of the dehydrator.

FIG. 4 is an operation explanatory view of the dehydrator.

FIG. 5 is a schematic plan view of a continuous frying machine.

FIG. 6 is a schematic side view of a continuous frying machine.

[Explanation of symbols]

1 Sludge Tank 3 Reaction Tank 4 Flocculant Dissolution Tank 10 Dehydrator 11 Machine Box 13 Main Drum 14, 15 Pressure Roller 16 Drive Roller 20 Drive Roller 21 Driven Roller 23 Filter Cloth 28 Suction Blower 29 Vacuum Hopper 34 Scraper 40 Continuous Lifter 41 oil tank 42 oil chamber 43 input side 44 outlet side 45 transfer mechanism 46 conveyor 47 conveyor plate 48 drive sprocket 49 driven sprocket 56 gas burner 70 incinerator A cake layer B dehydrated cake C fried formation

Claims (2)

[Claims] 1. A sludge treatment method comprising the following steps. (A) Stirred sludge such as leftover food is agitated with the coagulant in the reaction tank.
First step of mixing to produce aggregate sludge (b) The aggregate sludge is converted into an endless form in a dehydrator.
Suction blower while being transferred by suspended filter cloth
Is driven by a vacuum hopper and gravity dehydrated.
To form a cake layer, which is then applied to the filter cloth.
By the main drum and pressure roller while being transferred further
Second step (c) of dehydration under pressure to form a dehydration cake. The dehydration cake is an oil tank in a continuous frying machine.
Transfer of the dehydrated cake from the charging side to the discharging side
It is heated to 160-180 ℃ while being transferred by the mechanism.
The water contained in the oil chamber is allowed to evaporate the water content and
While being drained through the
The third step (d) is sent out by incinerating the fried product in an incinerator.
Fourth process 2. Stirred sludge such as leftover food and coagulant are mixed
And a reaction tank with a built-in stirrer,
The aggregate sludge produced in the reaction tank is dehydrated, and
A dehydrator that is considered to be g
The dried dehydrated cake passes through the heated waste oil
And a continuous frying machine that produces a fried product by
It is connected to a material handling machine and the fried products are incinerated.
And an incinerator, wherein the dehydrator includes a plurality of rotating rollers.
An endless filter cloth suspended in a space and charged on the surface of the filter cloth
Gravity dehydration of the agglomerated sludge from the shot reaction tank
Suction blower and vacuum to form cake layer
Transfer hopper and cake layer on gravity-dewatered filter cloth surface
Maine that dehydrates under pressure while forming a dehydrated cake
Ram and multiple pressure rollers and dehydrated cake on filter cloth
With a scraper to scrape more Having said continuous frying machine
Is an oil chamber formed in the longitudinal direction of the rectangular oil tank and the waste of the oil chamber.
In oil, from the input side of the dehydrated cake to the discharge side
Once, the water content of the dehydrated cake was evaporated and the oil
Continuously run the dehydrated cake while draining oil through the outdoors
The transfer mechanism for fried products and waste oil from the oil chamber are added.
A structure having a heating means for heating and maintaining a predetermined temperature.
A characteristic sludge treatment device.