JPH08206692A - Pressure type oil temperature dewatering treatment - Google Patents

Abstract

PURPOSE: To shorten the time of a dewatering process in a method for oil temperature dewatering treatment. CONSTITUTION: Waste containing an organic substance or inorganic substance is used for a raw material. A method for oil temperature dewatering treatment in which the raw material is applied to oil temperature dewatering treatment is constituted of a decomposition process for pressurizing or thermally decomposing the raw material, a deaeration process for decompressing the decomposed raw material, an oil-impregnating process for impregnating oil into the deaerated raw material under reduced pressure and a dewatering process for applying oil temperature dewatering treatment to the raw material impregnated with oil under reduced pressure, normal pressure or pressurization.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to waste containing organic substances or inorganic substances (hereinafter represented by the term organic waste and inorganic waste), which is useful as a recycled resource for reuse. In order to improve the efficiency and cost of the disposal of inorganic waste, the present invention relates to an improvement in the oil temperature dehydration treatment method in which the waste is used as a raw material for dehydration treatment.

[0002]

2. Description of the Related Art A conventional oil temperature dehydration treatment method is carried out to use organic waste as a raw material and dehydrate the raw material for recycling. In the dehydration step in this method, as shown in FIG. 3, the raw material (organic waste) introduced into the treatment device is dipped in a large amount of heated oil, and the oil permeates the raw material so that the water in the raw material is exposed to the outside. It is obtained by extruding into water and evaporating the water by the heat of oil (JP-A-2-63042, JP-A-2-286066, etc.). Inorganic waste can be treated in the same manner as waste liquid or sludge containing a large amount of organic matter. Usually, in order to improve the dehydration efficiency, the inside of the apparatus is depressurized during the dehydration process. Since the dehydrated raw material contains a large amount of oil, it is commercialized through a deoiling process using an oil crusher or the like.

[0003]

In the conventional oil temperature dehydration treatment method, in order to shorten the treatment time by simplifying the process,
The raw material is directly subjected to dehydration treatment. However, when the raw material is agglomerated, the penetration of the oil into the raw material during the dehydration process is slow, and the evaporation of water in the raw material is also slow, resulting in the drawback that the treatment time is long. Therefore, in order to shorten the dehydration process time, the treatment process was reexamined.

[0004]

[Means for Solving the Problems] As a result of studying the above-mentioned problems, what was developed is a raw material in an oil temperature dehydration treatment method in which a waste containing an organic substance or an inorganic substance is used as a raw material and this raw material is subjected to an oil temperature dehydration treatment. Decomposition step of decomposing under pressure or heat, deaeration step of placing the decomposed material under reduced pressure, oil permeation step of permeating oil into the material under reduced pressure from which the air has been removed, and decompression of the material infiltrated with oil. And a dehydration step of performing oil temperature dehydration treatment under normal pressure or pressure.

In the method of pressurized oil temperature dehydration treatment of the present invention, even in a batch treatment system in which a fixed amount of raw material is transferred and accumulated in each process to perform each process, the raw material is continuously transferred as needed without being stopped in each process. However, it can also be realized by a continuous processing method in which each processing is performed. In each step, a pretreatment step of adding water or steam to the raw material may be provided before the decomposition step, or a deoiling step required after the dehydration step may be performed stepwise as a rough deoiling step and a main deoiling step. The reduced pressure includes a vacuum state.

The waste as a raw material may be an organic waste containing an organic substance, an inorganic waste containing an inorganic substance, or a waste containing both. The organic waste includes processing waste generated from food processing plants, residues and sludge, food waste generated from restaurants and ordinary households, leftover food, and the like. Inorganic waste includes various kinds of waste liquids, sediment such as sludge, mining, civil engineering, and sludge discharged from construction sites.

[0007]

The pressurized oil temperature dehydration treatment method of the present invention, prior to dehydration of the raw material, does not pressurize or thermally decompose the raw material in the decomposition step to subdivide the raw material and immediately immerse it in the heated oil. In the deaeration process, the air (and part of the water) in the raw material that has been fragmented by depressurization is released, and in the oil permeation process, sufficient oil is allowed to permeate into the raw material in advance, so that the oil temperature in the dehydration process is increased. Shorten the time required for dehydration treatment. Also, regarding the oil temperature dehydration treatment itself, efficient dehydration is realized by separating the reduced pressure, normal pressure or pressurized state depending on the raw material.

In the decomposition step, the raw material is decomposed by pressure or heat (including a temperature increase due to pressurization in addition to heating from the outside), and the material is subdivided. In this case, if the raw material is pressurized or heated together with water or steam, it can be decomposed efficiently. This decomposition is particularly effective for the agglomerated raw material, which increases the surface area relative to the volume and makes the raw material in a rough state, thereby facilitating the penetration of oil into the raw material or the evaporation of water from the raw material.
In addition, depending on the raw material, there is a case where the decomposition step is not necessary and the treatment can be directly started from the next deaeration step. In the deaeration step, the decomposed raw material is placed under reduced pressure to release air in the raw material to facilitate oil permeation in the oil permeation step and to evaporate water in the raw material.

In the oil permeation step, air is expelled by permeating the oil into the raw material, oil as a heat medium in the dehydration treatment is applied to the surface of the raw material, and the oil permeates into the raw material in the dehydration treatment step. Save time. The oil infiltration process is
In some cases, it can be performed more efficiently by changing the depressurized state to the normal pressure or the pressurized state. As a result, in the oil temperature dehydration treatment, the oil is quickly permeated into the raw material immersed in the heated oil, and water is evaporated from the raw material. The dehydration process is
Under reduced pressure it facilitates the evaporation of water and under pressure it facilitates the penetration of oil. The rough deoiling step in the deoiling step shortens the time required for the main deoiling step and shortens the overall processing time of waste.

[0010]

Embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a flow chart in which main processing steps of the pressurized oil temperature dehydration processing method of the present invention are arranged. The area inside the broken line is a step newly added to the conventional oil temperature dehydration treatment method.
The specific treatment method may be, for example, a batch treatment method in which the decomposition step, the depressurization step, the oil permeation step, the dehydration step and the deoiling step are separately performed in separate devices, or There is a continuous processing system in which the processing devices are connected by a rotary valve.

Each step will be described step by step. Examples of the raw materials include organic wastes such as processing wastes from food processing plants, residues and sludges, food wastes from restaurants and the like, and leftover foods. These raw materials are put into the apparatus for the decomposition process together with water or steam. Water gains momentum by pressurization or heating and decomposes the raw material more efficiently. Since steam is preheated, it is more efficient and can be used for heating the raw material. It is possible and convenient. The heating temperature is adjusted so that the raw material is not oxidized.

Most of the decomposed raw material is subdivided,
The raw material that remains apparently lumped also becomes in a coarse state, and it becomes easy for oil to penetrate into the raw material, for air to be released from the raw material, or for water to evaporate. The raw material decomposed in this way is then put into an apparatus for the deaerating process, and under reduced pressure, air in the raw material can be released and a part (about 5%) of water in the raw material can be removed. The time required for the hot dehydration treatment can be shortened. The oil permeation step is a preparation step for the dehydration step, in which a predetermined amount of oil is permeated into the deaerated (and dehydrated) raw material to expel air. The oil may be permeated under reduced pressure, but it is efficient to change the pressure from reduced pressure to normal pressure or increased pressure.

The raw material that has been subjected to the above steps is subjected to oil temperature dehydration treatment in the dehydration step. Heated oil has high kinetic energy, and due to the effects of subdivision of the above raw materials, deaeration and oil permeation, it permeates into the raw material in a short time and expels the water in the raw material, and also as a raw material as a heat transfer medium. It heats rapidly and realizes rapid evaporation of water. Further, if the oil temperature dehydration treatment of the present invention is carried out under reduced pressure, the evaporation of water can be enhanced, and if it is carried out under pressure, the permeation of oil can be enhanced, and as a result, the treatment time can be further shortened.

In the conventional oil-temperature dehydration treatment, the time required for this oil-temperature dehydration treatment step depends on the size of the processing apparatus, but for example, the treatment which conventionally required 80 minutes was according to the present invention. For example, it can be completed in about 60 minutes, and a processing efficiency improvement of about 25% can be achieved. This is the ability to compensate for the increased treatment steps and still reduce the overall treatment time, resulting in improved waste treatment efficiency in the same size treatment equipment and thus lower unit cost of recycled resources. Will be able to.

The thus dehydrated raw material is subjected to a deoiling treatment with an oil crusher or the like in order to remove the oil content contained in the dehydrated raw material. In this deoiling step, oil that can be naturally separated in the crude deoiling step is separated from the dehydrated raw material, and the raw material is forcibly squeezed in the main deoiling step to realize an efficient treatment in a short time. . In this way, the deoiling process shortens the entire processing time of the waste by improving the efficiency of the deoiling process that is inevitably involved in the oil temperature dehydration process. The oil squeezed from the raw material may be discarded, but it can also be recovered and reused in the oil infiltration step (see FIG. 1).

In the conventional oil temperature dehydration treatment method, since the dehydration treatment took a long time, it was necessary to rely on the batch treatment method. However, in the pressure type oil temperature dehydration treatment method of the present invention, as described above, dehydration was performed. As a result of shortening the processing, it is characterized in that a continuous processing method is also possible. When this continuous processing method is adopted, since the pressure difference between each step due to depressurization and pressurization is large in the present invention, as shown in FIG. 2, a rotary valve having a container part 1 provided on a sphere at predetermined angular intervals. It is advisable to connect the processing devices of the respective steps using a rotary valve 3 or the like which is sealed and built in 2.

Further, when the batch processing method is adopted, it is not necessary to allocate an individual device to each process, and for example, a decomposition process and a deaeration process, an oil permeation process and a dehydration process,
It is possible to perform the treatment with three devices, a rough deoiling process and a main deoiling process, and in the above device configuration, if the decomposition process to the dehydration process are processed with one device, it can be reduced to two devices. Therefore, it is possible to realize an apparatus configuration that is the same as the conventional oil temperature dehydration treatment method.

[0018]

EFFECTS OF THE INVENTION The pressurized oil temperature dehydration treatment method of the present invention not only shortens the time required for the conventional oil temperature dehydration treatment but also enables continuous treatment of the entire treatment process. Therefore, it is possible to reduce the labor and cost required for the treatment, improve the treatment efficiency per unit time, and treat the waste at a lower cost. This means providing low-cost recycled resources for organic waste and reducing the cost of disposal for inorganic waste.

[Brief description of drawings]

FIG. 1 is a flowchart of a pressurized oil temperature dehydration treatment method of the present invention.

FIG. 2 is a perspective view of a rotary valve having a spherical rotary valve sealed therein.

FIG. 3 is a flowchart of a conventional oil temperature dehydration treatment method.

[Explanation of symbols]

 1 container part 2 rotary valve 3 rotary valve

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Claims (1)

[Claims] 1. A decomposition step of pressurizing or thermally decomposing the raw material in an oil-temperature dehydration treatment method in which a waste containing an organic substance or an inorganic substance is used as a raw material, and the raw material is subjected to an oil temperature dehydration treatment, and the decomposed raw material is decompressed. From the deaeration step to be placed below, the oil permeation step of permeating oil into the raw material under reduced pressure from which the air has been removed, and the dehydration step of subjecting the raw material permeated with oil to oil temperature dehydration treatment under reduced pressure, normal pressure or pressure A pressurized oil temperature dehydration treatment method comprising: