JP2001004111A - Waste disposal system and method of disposal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a waste disposal system which can reduce the volume of the waste and recycle the waste, which is the mixture of inorganic substance and organic substance without generating toxic substance from the waste. SOLUTION: A waste disposal system which disposes of waste 100, which is the mixture of inorganic substance, organic substance and sodium, comprises desalinating equipment removing the sodium from the waste, a dryer 300 drying the waste removed with the sodium, a primary incinerator 400 incinerating the organic substance mixed in the waste, and a secondary incinerator 500 melting the inorganic material remaining after high temperature processing. Molten inorganic substances is taken out as innoxious inorganic substance 600. With this, the waste can be reduced with the volume and recycled without generating toxic substance from the waste.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste treatment system, and more particularly to a waste treatment system and a treatment method for treating waste containing both inorganic and organic substances.

[0002]

2. Description of the Related Art Conventionally, waste such as an inorganic substance and an organic substance has been subjected to a landfill treatment or the like since it is impossible to incinerate the inorganic substance. However, the amount of this waste is so large that landfilling in the future makes it difficult to secure landfill sites, and makes landfill impossible due to the bad smell of waste generated after landfill. Is the actual situation.

[0003] In addition, there is a method of incinerating waste, but the generation of harmful substances such as dioxin during incineration has also been a problem.

[0004]

Therefore, when treating waste, it is ideal to reduce the volume and recycle the inorganic substances mixed in the waste, and the organic substances should not generate harmful substances. It is important to process.

[0005] An object of the present invention is to provide a waste treatment system and a treatment method capable of reducing the volume and recycling of waste without generating harmful substances from waste in which inorganic substances and organic substances are mixed. It is in.

[0006]

Means for Solving the Problems In order to achieve the above object, a feature of the waste treatment system according to the present invention is to remove salt from waste in which organic matter, inorganic matter and salt are mixed, The object of the present invention is to dry the removed waste, treat the dried waste at a high temperature, incinerate organic substances mixed in the waste, and melt the inorganic substance remaining after the high temperature treatment.

Specifically, the present invention provides the following apparatus and method. The present invention provides a waste treatment system for treating waste in which organic matter, inorganic matter, and salt are mixed, in a desalination facility for removing the salt from the waste, and drying the waste from which the salt has been removed. A drying facility, a high temperature treatment of the dried waste, a primary incineration facility for incinerating organic matter mixed in the waste, and a second incineration facility for melting the inorganic substance remaining after the high temperature treatment. There is provided a waste treatment system characterized by having the above.

Further, the present invention provides a waste treatment system for treating waste in which an organic substance, an inorganic substance and salt are mixed, and a cleaning apparatus for washing the waste and removing salt mixed in the waste. A rotary dewatering and drying apparatus for rotating the waste from which the salt has been removed to remove moisture adhering to the waste, and spraying steam and hot air on the waste for drying, and the dried waste. A high-temperature treatment device that performs high-temperature treatment and incinerates organic matter mixed in the waste, a solid-state melting furnace that melts the inorganic material remaining after the high-temperature treatment, and exhaust gas discharged from the high-temperature treatment device and the solid-state melting furnace. An exhaust gas treatment apparatus for treating gas is provided.

Preferably, a waste storage for storing the dried waste, a nitrogen gas injected into the waste storage for storing the waste, and an oxygen gas supplied to the high-temperature processing apparatus and the solid melting furnace are provided. An oxygen-nitrogen separator that separates and generates from air, a germ-cleaning device that cleans the nitrogen gas with germs, and a nitrogen-gas dry-supply device that dries the germ-cleaned nitrogen gas and supplies it to the waste storage.

Further, the present invention provides a waste treatment system for treating waste in which an organic substance, an inorganic substance, and salt are mixed, and a cleaning apparatus for washing the waste and removing salt mixed in the waste. A rotary dewatering / drying device for rotating the waste from which the salt has been removed to remove moisture adhering to the waste, and for drying the waste by spraying steam and hot air thereon; and storing the dried waste. Waste storage, a germ washing apparatus for germ-washing nitrogen gas injected into a waste storage for storing the waste, and a nitrogen gas dry supply for drying the germ-washed nitrogen gas and supplying the same to the waste storage Apparatus, high-temperature treatment of the waste transported from the waste storage, high-temperature treatment device to incinerate organic matter mixed in the waste, and the inorganic matter remaining after the high-temperature treatment A solid melting furnace for melting, a nitrogen gas to be supplied to the waste storage, an oxygen-nitrogen separation device for separating and generating, from air, an oxygen gas to be supplied to the high-temperature processing device and the solid-state melting furnace, the high-temperature processing device and An exhaust gas treatment device for treating exhaust gas discharged from a solid melting furnace is provided.

Further, the present invention provides a waste treatment method for treating a waste in which an organic substance, an inorganic substance, and a salt are mixed, wherein the waste is washed to remove a salt contained in the waste. The salt-removed waste is rotated to remove moisture adhering to the waste, and the waste is dried by spraying steam and hot air thereon. Incineration of mixed organic matter,
The present invention provides a waste treatment method, wherein the inorganic substance remaining after the high-temperature treatment is melted and taken out as a harmless inorganic substance, and the exhaust gas discharged at the time of the incineration and the melting is rendered harmless.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A waste disposal system and a waste disposal method according to one embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of a waste disposal system according to one embodiment of the present invention. The waste treatment system includes a desalination facility 200, a drying facility 300, a primary incineration facility 400, and a secondary incineration facility 500. The desalination equipment 200 removes salt from the waste 100 in which organic matter, inorganic matter, and salt are mixed. Drying equipment 3
00 dries the demineralized waste. The first incinerator 400 treats the dried waste at a high temperature, and incinerates organic matter mixed in the waste. The second incinerator 500
The inorganic material remaining after the high-temperature treatment is melted. After that, the melted inorganic substance is taken out as a harmless inorganic substance 600 and used as a resource.

FIGS. 2, 3 and 4 show, as specific examples of the waste treatment system of FIG. 1, particularly shellfish waste generated and taken out from a seawater introduction passage of a power generation facility using seawater as cooling water. 1 shows an example of a processing system.

FIG. 2 shows a desalting step for removing salts contained in the waste, FIG. 3 shows a drying step for drying the desalted waste, and FIG. 4 shows incineration of the dried waste. This shows the incineration process. This waste 1 is not discharged continuously every day, but is discharged in large quantities only at the time of periodic inspection. Therefore, it is impossible to treat the discharged waste 1, that is, all the shellfish in a short time, and a storage step for storing the shellfish is required.

As shown in FIG. 2, the waste 1 taken out from the seawater introduction channel is carried by a conveying means 2, for example, a conveyor, and is subdivided into containers 3 of an appropriate size. Carried.

The shell opening device 4 forcibly opens the closed shell, and is a preparation step for washing and desalting the salt contained in the shell in the next step. The shell opening device 4 is a high-temperature steam 5
Are immersed in the high-temperature water tank for each of the containers 3 in which the subdivided wastes 1 are stored, and are held until the shells are opened.

At this time, in order to easily open the shells, an external force is forcibly applied to the container 3 or a flow is generated in the high-temperature water in the water tank so that all the shells are opened. In addition, the container 3
Naturally, it becomes a container such as a basket made of wire mesh, which allows easy access to high-temperature water.

After confirming the open state of the shell, the waste 1 taken out of the shell opening device 4 is transferred to the next washing device 7 in the state of being kept in the container 3. The cleaning device 7 includes fresh water 8
And a shower 6. Salt and other harmful substances contained in the open shell are washed with fresh water 8.

First, the container 3 containing the waste 1 is filled with fresh water 8
Immersed in a circulating water tank to remove salts almost completely and wash. Thereafter, each of the containers 3 is lifted out of the water tank, and is subjected to a final cleaning by the shower 6. In this state, the salts contained in the shellfish are almost completely removed, and the inorganic substances after melting described later do not contain salts.

The fresh water 8 used here can be systemized by a seawater desalination device 39 that produces freshwater 41 from seawater, or city water can be used. The washed and desalinated shellfish are sent to the next drying step.

The drying of the waste 1 is very important for preventing rot and odor. In particular, when relatively small objects are in an overlapping state, it is necessary to dry them while separating them. Furthermore, it is effective to apply a physical force to a substance such as moisture that is relatively easy to separate from an object. Here, the waste after washing is put into a rotating container, water is scattered using centrifugal force generated by the rotating force and drop separation by gravity, and in addition, high-temperature heated steam is injected to promote deaeration and drying. ing. Further, hot air is introduced in place of steam in the post-steam drying process to completely deaerate and dry the moisture mainly contained in organic matter.

Specifically, as shown in FIG. 3, the open shell 10 transported to the container up to the previous step is taken out of the container 3 here, and is separated via the hopper 9 into the rotary dehydrating / drying machine 11. It is thrown. The rotating dehydrator 11 is rotated by a drive motor 13. When put into the rotary dewatering dryer 11, the water adhering to the open shell 10 is blown out of the container by centrifugal force generated in the rotating container, and the open shell 10 is randomly inverted in the container by gravity.

Heating steam 12 is introduced into the rotary dehydrator 11 to promote drying, and the steam 12 is used to perform drying after dehydration.

To complete the drying, steam 12 is stopped and hot air 14 is introduced. The acting force on the open shell 10 by hot air drying is the same as that in steam drying. The rotary dewatering dryer 11 may use separate dryers for dehydration drying and hot air drying.

Next, as shown in FIG. 4, the dried open shellfish 10 continues to the next incineration process, or once stored and then moved to the incineration process. The storage and incineration equipment mainly consists of the following equipment.

Generally, even a completely dried object adsorbs moisture in the air as it is, and if it comes into contact with various bacteria in the air, rot starts. The shellfish storage 15 has an open shell 1
It stores the dry waste 16 which is 0, and has a structure for preventing the invasion of the outside air. The pressure in the storage is slightly higher than the atmospheric pressure. The means for increasing the internal pressure of the storage can be achieved by supplying the nitrogen gas which has been subjected to the germ washing by the germ washing device 35 and dried by the drying supply device 36.

The incineration equipment includes a high-temperature processing apparatus 19, exhaust gas processing equipment generated therefrom, and a high-temperature processing apparatus 1
And a solid melting furnace 23 for melting the remnant 20 made of the material 9. The fuel 18 supplied to the high-temperature processing apparatus 19 and the fuel 22 supplied to the solid melting furnace 23 are oxidized by a gas containing a large amount of oxygen.

In general, when fuel is burned with air, the flame temperature does not increase so much because heat is taken away by nitrogen contained in the air. Moreover, since the partial pressure of oxygen contained in the air is low, it is necessary to supply more air than the theoretical air amount in order to complete the combustion. Therefore, the amount of nitrogen increases and the flame temperature further decreases. On the other hand, when burning with a gas having a high oxygen partial pressure excluding nitrogen, most of the calorific value of the fuel is used for heating the target. In addition, the flame temperature becomes very high, and the object rises to the melting temperature.

Therefore, an oxygen-nitrogen separator 26 for generating a nitrogen gas 32 to be supplied to the shellfish storage 15 and an oxygen gas 31 for oxidizing the fuels 18 and 22 is provided in the system of the present embodiment.

Hereinafter, the storage and processing system will be specifically described. The nitrogen gas 32 obtained by the oxygen-nitrogen separation device 26 is sterilized by a germ washing device 35,
At 6, the water is removed and supplied to the shellfish storage 15. The sterilized and dried nitrogen gas 32 does not cause decay of the shellfish even when it comes into contact with the completely dried shellfish waste 16 and can prevent the generation of offensive odor and the like.

The supplied nitrogen gas 32 stays in the shellfish storage 15 for a certain period of time and is then discharged outside the shellfish storage 15. The nitrogen gas discharge system is provided with a deodorizing device 37, Released to the atmosphere 38 as nitrogen gas. In addition,
The oxygen-nitrogen separator 26 separates oxygen and nitrogen using the air 33 introduced by the blower 34.

Next, the incineration process will be described in detail. The dried waste 16 taken out from the shellfish storage 15 is put into the high-temperature treatment device 19 via the transport means 17 and the fuel 1
8 and high-temperature gas generated from the oxygen-rich gas 31 obtained from the oxygen-nitrogen separator 26.

Exhaust gas generated during the high-temperature treatment process is completely rendered harmless by an exhaust gas treatment device 27 for treating harmful substances such as dioxin.
The temperature is rapidly cooled to below ℃ and the chimney 3
Emitted from 0 to the atmosphere.

On the other hand, the remnants 20 discharged from the high-temperature processing device 19 are transported by the transporting means 21 and charged into the solid melting furnace 23. In the solid melting furnace 23, a high-temperature gas is generated from the supplied fuel 22 and the gas 25 having a high oxygen concentration obtained from the oxygen-nitrogen separator 26, and the remnant 20 charged therein is melted.

The melted residue 20 is taken out of the system as a harmless inorganic substance 24 and is effectively used as a resource. Powder is ideal as a form that can be easily used as a resource,
In the case of the shellfish of this embodiment, it becomes pure calcium oxide,
It can be used for the operation of this system as a neutralizing agent for hydrogen chloride gas contained in the exhaust gas generated in the high-temperature processing device 19, and can be variously used as a raw material.

The high-temperature exhaust gas generated from the solid-state melting furnace 23 is discharged from the exhaust gas processing device 27, the temperature reducing device 28, and the induction fan 2 similarly to the exhaust gas discharged from the high-temperature processing device 19.
9. It is discharged into the atmosphere through the chimney 30.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a waste treatment system according to an embodiment of the present invention.

FIG. 2 is a diagram showing a desalination process for removing salts contained in waste in a specific example of the waste treatment system of FIG. 1;

FIG. 3 is a view showing a drying step of drying desalted waste in a specific example of the waste treatment system of FIG. 1;

FIG. 4 is a view showing a specific example of the waste treatment system shown in FIG. 1, showing an incineration step of incinerating dried waste.

[Explanation of symbols]

1,100 waste, 2 conveyance means, 3 containers, 4 shellfish opening device, 5,12 steam, 6 shower, 7 cleaning device, 11 rotary dehydrator, 14 hot air, 15 air Shellfish storage, 16: Dry waste, 19: High temperature treatment equipment, 20: Remnant, 23: Solid melting furnace, 24,600: Harmless inorganic substance, 2
6 ... oxygen and nitrogen separation device, 27 ... exhaust gas treatment device, 28 ...
Temperature-reducing device, 29: Attraction fan, 30: Chimney, 31: Oxygen gas, 32: Nitrogen gas, 35: Bacteria cleaning device, 36: Drying supply device, 200: Desalination device, 300: Drying device, 4
00: primary incinerator, 500: secondary incinerator

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Takashi Kimura 3-2-2, Sachimachi, Hitachi, Ibaraki Prefecture Within Hitachi Engineering Services Co., Ltd. (72) Hiroshi Arakawa 3-2-2, Sachimachi, Hitachi, Ibaraki No. 2 F term in Hitachi Engineering Services Co., Ltd. (reference) 3K061 NB03 3K065 AA24 AB03 AC20 BA05 BA10 CA01 CA11

Claims (5)

[Claims] 1. A waste treatment system for treating waste in which an organic substance, an inorganic substance, and salt are mixed, comprising: a desalination facility for removing the salt from the waste; and drying the waste from which the salt is removed. Drying equipment, and a high temperature treatment of the dried waste, a primary incineration facility to incinerate organic matter mixed in the waste, and a secondary incineration facility to melt the inorganic matter remaining after the high temperature treatment. A waste treatment system comprising: 2. A waste treatment system for treating waste in which an organic substance, an inorganic substance, and salt are mixed, a washing apparatus for washing the waste and removing salt mixed in the waste, A rotary dewatering and drying device for rotating the waste to remove moisture adhering to the waste and spraying steam and hot air on the waste for drying, and subjecting the dried waste to high temperature treatment, A high-temperature processing apparatus for incinerating organic substances mixed in the waste, a solid melting furnace for melting the inorganic substances remaining after the high-temperature processing, and an exhaust gas discharged from the high-temperature processing apparatus and the solid melting furnace. A waste treatment system comprising an exhaust gas treatment device. 3. A waste storage for storing the dried waste, a nitrogen gas injected into the waste storage for storing the waste, and a nitrogen gas supplied to the high-temperature processing apparatus and the solid melting furnace. An oxygen-nitrogen separator that separates and generates oxygen gas from air, a germ-washing device that germs and cleans the nitrogen gas, and a nitrogen-gas drying-supply device that dries the germ-washed nitrogen gas and supplies it to the waste storage A waste treatment system comprising: 4. A waste treatment system for treating waste in which an organic substance, an inorganic substance, and salt are mixed, a washing apparatus for washing the waste and removing salt mixed in the waste, A rotary dewatering / drying device for rotating the waste from which the waste has been removed to remove moisture adhering to the waste and spraying steam and hot air on the waste for drying, and a waste storage for storing the dried waste And a germ cleaning device for germ-washing nitrogen gas injected into a waste storage for storing the waste, a nitrogen gas drying supply device for drying the germ-cleaned nitrogen gas and supplying it to the waste storage, A high-temperature treatment apparatus for high-temperature treatment of the waste conveyed from the waste storage and incineration of organic substances mixed in the waste; and a solid melting apparatus for melting the inorganic substance remaining after the high-temperature treatment. An oxygen-nitrogen separator for separating and generating, from air, nitrogen gas to be supplied to the waste storage and oxygen gas to be supplied to the high-temperature processing device and the solid-state melting furnace; and discharging from the high-temperature processing device and the solid-state melting furnace. And a waste gas treatment device for treating exhaust gas to be discharged. 5. A waste treatment method for treating a waste in which an organic substance, an inorganic substance and a salt are mixed, wherein the waste is washed to remove the salt mixed in the waste, and the salt is removed. The waste is rotated to remove moisture attached to the waste, and the waste is dried by spraying steam and hot air thereon, and the dried waste is treated at a high temperature to remove organic substances mixed in the waste. A method for treating wastes, wherein the inorganic matter remaining after incineration and the high-temperature treatment is melted and taken out as harmless inorganic substances, and the exhaust gas discharged during the incineration and the melting is rendered harmless.