JPH05138197A - Treatment of sludge and equipment thereof - Google Patents

Abstract

PURPOSE:To enable nonenvironmental complete incineration treatment by dehydrating sludge of leavings such as leftover rice and garbage an passing the same through heated oil and making it to a frying state without coating. CONSTITUTION:Organic sludge such as leavings or hydrated sludge is agitated and mixed with a flocculating agent and made to flocculated sludge. The flocculated sludge is dehydrated by a dehydrator 10 an becomes platelike dehydrated cake B. Then the dehydrated cake B is introduced into a continuous frying machine and transferred while passing through heated oil in an oil chamber of an oil tank by a conveyor. Thereby the dehydrated cake B is fried in a frying state without coating wherein the quantity is decreased at about 1/5 and becomes the mate C forming the frying state without coating. Then the material C is incinerated as a simple substance or together with the other material to be incinerated in an incinerator 70.

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, a method for treating water containing substances such as leftover food produced in the manufacturing process of the food industry and leftover food containing organic sludge due to residues such as leftovers. The present invention relates to a sludge treatment method and an 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 leftover vegetables, 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 are common.

[0003]

[Problems to be Solved by the Invention] In the former one of those described in the prior art, the composting of the dehydrated cake sludge is entrusted to a specialist such as a compost center, but the fine particles are compressed. Due to the nature of the dehydrated cake in the open state, it is difficult to compost only the cake, and 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 entrustment is getting higher year by year with the surplus of the processing company, and depending on the distance to the processing site, there are cases where the company does not undertake it. there were.

Also in the latter method, in the method of mixing sludge and leftover rice and combusting in an incinerator, the sludge is dried in the furnace and sequentially incinerated from the dried portion, which requires a long time and requires a large amount of treatment. Has a problem in that it requires a fairly large and expensive equipment, and in the method of drying it with another dryer and then burning it in an incinerator, in the case of cakes in which fine particles are compressed, the air permeability is However, it took a long time to stir, and had a problem that it causes a pollution problem because it produces a bad odor during the drying process except for the sealing and drying.

The present invention has been made for the purpose of solving the problems of such conventional techniques.

[0006]

For this purpose, the method of the present invention is preferably a plate-shaped dehydrated cake obtained by dehydrating a residue sludge such as leftover rice mixed with a flocculant with stirring in a reaction tank by a dehydrator. The dehydrated cake is then passed through heated oil in a continuous frying machine to form a fried product, and the fried product is then incinerated in an incinerator. The apparatus invention is preferably a reaction tank in which a residue sludge such as leftover food and a flocculant are agitated and mixed, and a dehydrator when connected to the reaction tank, and the mixed sludge is dehydrated into a dehydrated cake, It is connected to the dehydrator,
And a continuous frying machine in which the fed dehydrated cake passes through the heated oil to form a fried-form product, and incineration in which the fried-form product is incinerated and is connected to the continuous frying machine It is characterized by a structure including a furnace.

[0007]

The method and apparatus according to the present invention have the above-mentioned structure, and sludge treatment by the method is performed as follows. Water-containing sludge such as organic sludge, leftover food, and residual vegetables generated in the manufacturing process of the food industry is once stored in a sludge tank, and is 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 agglomerate sludge is introduced into a dehydrator, preliminarily dehydrated (gravity dehydration) on the rotating filter cloth and transferred while forming a cake layer, and the drum, the first pressure roller, and the second pressure roller. And it is dehydrated under pressure by a drive roller and taken out as a plate-shaped dehydrated cake having a water content of about 85%. Subsequently, the dehydrated cake taken out is put into a continuous frying machine.
The oil chamber of the continuous frying machine has a predetermined amount of edible oil that is used as waste oil that cannot be reused due to stains or oxidation in food processing, and a gas burner arranged at the bottom of the oil tank pan preferably 160 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. The formed substance is incinerated in the next incinerator alone or together with other incinerators.

[0008]

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. Sludge, mainly organic sludge caused by residues such as leftover food and leftovers generated in the food industry, is stored in a sludge tank 1 and supplied from the sludge tank 1. The mud pump 2 feeds the reaction tank 3 with mud. 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 at the same time as 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.

As described above, the dehydrator 10 dehydrates the aggregate sludge to a water content of 85% and takes it out as a dehydrated cake, and its schematic configuration is shown in FIGS. 2 to 4. To further explain, in these figures, the substantially box-shaped machine 1
The drum 13 is rotatably supported between the both side arm portions 12 of the first pressure roller 14, and the first pressure roller 14, the second pressure roller 15 and the drive roller 16 that press the filter cloth, which will be described later, against the drum 13 are provided. The pressure rollers 14 and 15 are rotatably supported, and pressure adjusting levers 17 and 18 are attached to the pressure rollers 14 and 15, respectively, and a pressure handle 19 is attached to the drive roller 16, and the levers 17 and 18 and the handle 19 are attached. The pressing force of the filter cloth against the drum 13 can be finely adjusted by operating. A drive roller 20, a driven roller 21 which is obliquely higher than the roller 20, and a tension roller 22 which is rotatably supported at an inner part obliquely lower than the drive roller 16 are rotatably supported by the machine 11, respectively. , 14,
A filter cloth 23, such as a synthetic woven cloth, is suspended in an endless manner between the widths 15, 16 and 22 of the lateral width, and the filter cloth 23 receives the rotational force of the drive roller 20 by the drive motor 24, and preferably, every time. It rotates at a rotational speed of 2.4 to 9.6 m, and the tension of the filter cloth 23 can be finely adjusted by operating the attached filter cloth tension lever 25. In addition, the machine 11 has a charge chute 26,
A charge chute raising / lowering lever 27 is provided, and the aggregate sludge from the reaction tank 3 is supplied to the charge chute 26, and at the same time the lever chute 27 is charged on the rotating filter cloth 23 to operate, whereby the aggregate sludge is discharged. Is pre-dehydrated (gravity dehydration) by the action of a vacuum hopper 29 disposed below the filter cloth portion between the drive roller 20 and the driven roller 21 by the drive of the suction blower 28, and the filtrate is a gas-liquid mixture connected by a pipe line 30. The water is separated into water and air in the separator 31, and the water is used as the washing water for the washing shower 33 for washing the filter cloth 23 through the filtrate circulation device 32, and the air is discharged. The aggregate sludge charged on the filter cloth 23 is charged as described above.
Preliminary dewatering (gravity dewatering) is performed in the vacuum hopper 29 portion, and is transferred while forming the cake layer A on the surface of the rotating filter cloth 23, and is transferred by the drum 13 and the first and second pressure rollers 14 and 15. The dehydrated cake B, which has been dehydrated under pressure and further strongly dehydrated (water content of about 85%) by the drive roller 16, is scraped by the scraper 34 into a plate-shaped cake, is transferred from the cake chute 35 to the next continuous frying machine 40. It is automatically turned on.

The continuous frying machine 40 is one in which the fed dehydrated cake B is passed through heated oil to form a frying-like formation of a frying-like shape, 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 of the oil tank 41 has a side 43 into which the dehydrated cake B is fed.
A transfer mechanism 45 that advances toward the lead-out side 44 is provided. More specifically, in the oil in the oil chamber 42, a drive in which a conveyor 46 composed of a large number of conveyor plates 47 traveling from the input side 43 to the output side 44 is rotatably mounted on the oil tank portion of the input side 43. Below the sprocket 48 and the driven sprocket 49 rotatably mounted on the oil tank of the outlet side 44 and below the oil chamber 42 (oil tank bottom)
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, and the conveyor 46 is rotated by a drive sprocket 48 that is rotated by receiving the rotational force of the drive source 53, and the dehydrated cake is put into oil from the input side 43. B is transferred by the feed plate 52 of the conveyor 46 and is fried in a fried form, and the chute 54 on the lead-out side 44
It is further drawn out as a fried product C and put into the next incinerator. Further, the speed of the conveyor 46 can be appropriately adjusted by the transmission 55, and the rotation of the filter cloth 23 of the dehydrator 10 can be changed. It can be driven according to the speed. 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 (oil tank pan bottom) in the oil tank 41, and
The gas pipe 57 of these burners 56 is connected to a gas introduction pipe 62 via a branch pipe 61 having a gas cock 58, an automatic temperature control thermo valve 59, a pilot cock 60, etc., and from a connection port 63 of the gas introduction pipe 62. The gas burner 56 was introduced into the oil chamber 42 by the supplied heat source gas (for example, 90
The oil of 1 liter) is heated to 160 to 180 ° C., and the heating temperature is kept constant by the thermostat thermostat 59.

The formed product C emptied by the continuous frying machine 40 is reduced to about 1/5 of the dehydrated cake B and put into an incinerator, preferably a combustible incinerator 70, and by itself,
Or it is incinerated together with other incinerated materials. Since the combustible incinerator 70 has a known structure including an oxygen blowing unit, an incinerator cooling unit, and the like, illustration and description of its configuration will be omitted.

[0013]

According to the present invention, however, a large amount of water content is evaporated in a short time by the action of the oil heated by the dehydrated cake dehydrated by the dehydrator to a water content of about 85% through the continuous fryer. It is a fried product that is incinerated in an incinerator.Flying by a continuous fried machine is a process for drying, weight reduction, and stabilization for the purpose of incineration. Compared with the conventional dewatering cake incineration technology of drying and incinerating the dewatering cake in an incinerator, which requires excessive costs, etc., the construction cost is low, maintenance is easy, and it is economical.

Further, according to the present invention, since the sludge in the form of dehydrated cake is made into a fried form by frying in a continuous frying machine, a method for removing moisture containing the fried form is obtained. Can be treated for a short period of time, no odor is generated, and the fried product is in a state of "crispness" in which oil is impregnated, so its flammability is extremely high and it is an exhaust gas pollution caused by air pollution during incineration. There is no problem with. Further, since the combustibility is extremely high, and therefore the temperature inside the furnace becomes high, it is possible to easily incinerate water-containing substances such as leftover rice and leftover vegetables.

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 can be used. It is economical because it can be incinerated sufficiently and the installation area can be saved.

Further, according to the present invention, since the oil for forming the fried product is a reuse of waste oil, it does not cost much,
It is economical because the maintenance cost is low because of only the gas cost of the heat source.

[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 40 Continuous frying machine 70 Incinerator B Dewatering cake C Flying formation

Claims (4)

[Claims] 1. A residue sludge such as leftover rice is dehydrated by a dehydrator to form a dehydrated cake, and the dehydrated cake is then passed through heated oil in a continuous fryer to form a fried product, which is then fried. A method for treating sludge, characterized in that the shaped product is incinerated in an incinerator. 2. The sludge treatment method according to claim 1, wherein the residual sludge is stirred and mixed with a coagulant in a reaction tank to form a dehydrated cake. 3. A dehydrator in which residual sludge such as leftover rice is dehydrated to form a dehydrated cake, and a dehydrated cake which is connected to the dehydrator and which is thrown in passes through the heated oil. An apparatus for treating sludge, comprising: a continuous frying machine that is a fried-form product, and an incinerator that is connected to the continuous frying machine and that incinerates the fried-form product. 4. The sludge treatment device according to claim 3, wherein a reaction tank for stirring and mixing the residual sludge and the coagulant is connected to the dehydrator.