JP5039634B2 - Waste treatment facility and waste treatment method - Google Patents

Description

  The present invention provides a waste treatment facility comprising an incineration facility in which waste is incinerated, and a methane fermentation facility in which a part of the organic waste contained in the waste is supplied and subjected to methane fermentation, and The present invention relates to a waste processing method for performing an incineration processing step of incinerating waste in an incineration facility and a methane fermentation step of supplying a part of organic waste contained in the waste to the methane fermentation facility and performing methane fermentation.

Conventionally, waste treatment facilities that incinerate waste such as municipal waste and industrial waste have been widely used.
In this kind of waste treatment facility, from the viewpoint of environmental considerations and economic efficiency, it is considered to incinerate while recovering energy rather than simply incinerating waste.
As one method, methane gas is produced by methane fermentation of organic waste such as raw garbage contained in incinerated waste, and the obtained methane gas is used as a heat energy source. It has been implemented.

By the way, in methane fermentation, it is known that methane bacteria generate a phenomenon called ammonia inhibition that reduces its activity in a high ammonia concentration state, and methane fermentation is performed by introducing raw garbage into a methane fermentation tank. At that time, methane fermentation is performed after diluting raw garbage with dilution water in advance so that the ammonia concentration in the methane fermentation tank does not rise above a predetermined value.
For example, if all of this diluted water is covered with tap water, industrial water, etc., water resources with high utility value will be consumed and this will go against environmental and economic gains.

For this reason, for example, as shown in Patent Document 1 below, digested liquid after methane fermentation discharged from a methane fermentation tank is used as the dilution water.
However, in methane fermentation, organic carbon in raw garbage is converted into methane or carbon dioxide and discharged from the treated water as a gas, but nitrogen is only reduced to ammonia, and most of it remains in the treated water.
Therefore, as the total nitrogen, there is almost no change between the processed material before methane fermentation and the digested liquid after methane fermentation, and this digested liquid after methane fermentation is used as dilution water for diluting raw garbage. However, the ammonia concentration in the methane fermentation tank cannot be reduced, and eventually ammonia inhibition occurs.

  For this reason, conventional disposal includes an incineration facility in which waste is incinerated, and a methane fermentation facility in which a part of the organic waste contained in the waste is supplied to perform methane fermentation. Conventionally, a waste treatment facility, an incineration treatment process in which waste is incinerated in an incineration facility, and a methane fermentation process in which a part of the organic waste contained in the waste is supplied to the methane fermentation facility to perform methane fermentation However, it is difficult to expect sufficient merit in terms of environment and economy.

JP-A-56-13091

  It is an object of the present invention to improve the environmental and economic merits of waste treatment facilities and waste treatment methods.

  In order to solve the above problems, a waste treatment facility according to the present invention is provided with an incineration facility in which waste is incinerated, and a part of the organic waste contained in the waste is supplied from the incineration facility. A methane fermentation facility for methane fermentation treatment, wherein the organic waste and dilution water are mixed, and an organic substance contained in the organic waste is dispersed in the dilution water; A waste treatment facility provided in the methane fermentation facility with a methane fermentation tank in which the organic substance dispersed in the dilution water in the mixing device is introduced together with the dilution water and subjected to methane fermentation, The waste water discharged from the incineration facility is used for the dilution water.

  Moreover, the waste processing method concerning this invention for solving the said subject is a methane fermentation which incinerates a waste with an incineration equipment, and also has a methane fermentation tank for a part of organic waste contained in the said waste Supply to the facility, and in the methane fermentation facility, the organic waste and dilution water are mixed to disperse the organic substance contained in the organic waste in the dilution water, and dispersed in the dilution water. A waste treatment method for introducing methane fermentation by introducing the organic substance into the methane fermentation tank together with the dilution water, characterized in that waste water discharged from the incineration facility is used as the dilution water.

In a waste treatment facility equipped with an incineration facility in which waste is incinerated and a methane fermentation facility in which a part of the organic waste contained in the waste is supplied and subjected to methane fermentation, Various waste water is discharged from the incineration facilities.
For example, waste pit drainage that exudes from waste pits where waste is stored, cleaning drainage that cleans transport vehicles that transport waste, cleaning drainage that cleans equipment provided in incineration facilities, and domestic wastewater The exhaust gas treated water from the exhaust gas treatment device is discharged.
Therefore, incineration facilities usually require wastewater treatment, but in the present invention, these are used for diluting water in methane fermentation facilities, so the load of wastewater treatment in incineration facilities is reduced.
That is, it is possible to improve the environmental and economic advantages of the waste treatment facility and the waste treatment method.
In particular, when waste pit drainage, washing wastewater, or domestic wastewater containing organic substances as dilution water is used, this dilution water contains organic substances and is introduced into the methane fermentation facility. The amount of organic material is increased and more methane gas can be produced.
Therefore, according to such a suitable aspect, the merit in the environmental aspect and economical aspect in a waste treatment facility and a waste treatment method can be improved further.

A preferred first embodiment of the present invention will be described below with reference to the drawings.
First, the waste treatment facility will be described with reference to FIG.
FIG. 1 is a flowchart showing the waste treatment facility of the present embodiment, where 10 indicates an incineration facility and 20 indicates a methane fermentation facility.

As shown in FIG. 1, the incineration facility 10 in the waste treatment facility of the present embodiment includes a waste pit 11 for storing the waste carried into the waste treatment facility, and the waste pit. 11 is provided with a separation device 12 for separating waste into incineration waste and waste for methane fermentation to be supplied to the methane fermentation facility 20 side. A crushing device (not shown) and a foreign matter removing device (not shown) are provided for crushing the waste to improve the sorting performance before sorting the material.
Further, the incineration facility 10 according to the present embodiment includes an incinerator 13 that incinerates the incineration waste sorted by the sorting device 12 and an incineration that stores incineration waste to be incinerated in the incinerator 13. A waste pit 31 is provided.
Further, the incineration facility 10 is provided with a cleaning device 14 for cleaning a transport vehicle such as a truck that transports the waste to be stored in the waste pit 11 from the outside to the waste processing facility. Is provided with a drainage pit 14a for storing cleaning wastewater after washing the transport vehicle.

  On the other hand, in the methane fermentation facility 20, the methane fermentation waste and dilution water supplied from the separation device 12 are accommodated and mixed, and the methane fermentation waste is mixed with the mixing device 21. A dehydration device 22 (hereinafter also referred to as “waste dehydration device 22”) into which a mixed liquid formed by mixing with dilution water is introduced and solid-liquid separated, and a liquid component discharged from the waste dehydration device 22 Is introduced into the methane fermentation tank 23 for methane fermentation, and the water (digested liquid) in the tank of the methane fermentation tank 23 is introduced into the sludge (digested sludge) and the treated water for solid-liquid separation. (Hereinafter also referred to as “digested sludge dewatering device 24”), the solid content separated by the waste dewatering device 22 and the solid content (digested sludge) separated by the digested sludge dewatering device 24 are introduced and subjected to aerobic fermentation. Aerobic fermenter 25 is provided. .

  Further, in the waste treatment facility of the present embodiment, the waste introduction path L1 for introducing the waste into the waste pit 11, and the separation device 12 from the waste pit 11 via the crushing device and the foreign matter removing device. A waste supply path L2 for supplying waste to the incinerator, an incineration waste supply path L3 for supplying the incineration waste separated by the separation device 12 to the incineration waste pit 31, and an incineration waste pit 31 Incinerator supply path L 21 for supplying waste stored in the incinerator 13 and methane fermentation waste for supplying the methane fermentation waste separated by the separation device 12 to the mixing device 21 A supply path L4 is provided.

  Further, in the waste treatment facility of the present embodiment, a waste pit drainage supply path L5 for supplying sewage (waste pit drainage) leached from the waste stored in the waste pit 11 to the mixing device 21. And an incineration waste pit drainage supply path L22 and a cleaning device 14 for supplying sewage (incineration waste pit drainage) exuded from the waste stored in the incineration waste pit 31 to the mixing device 21. A cleaning wastewater supply path L6 for supplying cleaning wastewater to the mixing device 21 from the provided drainage pit 14a, and an exhaust gas treatment device for treating exhaust gas generated by incineration of incineration waste in the incinerator 13 (FIG. The exhaust gas treated water supply path L17 for supplying wastewater from the mixing device 21 to the mixing device 21 and the mixed liquid discharged from the mixing device 21 to the waste dewatering device 22 Liquid supply path L7 for liquid, liquid to be processed solid for liquid separation (processed liquid for methane fermentation) by the waste dehydrator 22, and liquid supply path L8 for processing liquid to supply to the methane fermentation tank 23; A solid content supply path L <b> 9 for supplying the solid content solid-liquid separated by the product dehydrator 22 to the aerobic fermentation tank 25 is provided.

  Furthermore, in the waste treatment facility of the present embodiment, the methane gas discharge path L10 through which the methane gas generated in the methane fermentation tank 23 is discharged out of the system and the water (digestion liquid) in the tank of the methane fermentation tank 23 are digested sludge. Digested liquid supply path L11 for supplying to the dehydrator 24, digested sludge supply path L12 for supplying the digested sludge solid-liquid separated by the digested sludge dewaterer 24 to the aerobic fermentation tank 25, and the digested sludge dewaterer The treated water discharge path L13 for discharging the treated water solid-liquid separated in 24 to the further wastewater treatment process, and for discharging incombustibles such as metal scraps from the incinerator 13 to the outside of the system. An incombustible discharge path L14 and a fermentation residue supply path L15 for supplying the residue (fermentation residue) after being fermented in the aerobic fermenter 25 to the incinerator 13 for incineration with the incineration waste It has been kicked.

Specific equipment used for each device is not particularly limited. For example, a biaxial crusher, a uniaxial crusher, a vertical crusher, a bag breaker, or the like is adopted as the crushing device. Can do.
For example, a magnetic separator for removing metal can be adopted as the foreign matter removing device.
As the sorting device 12, for example, a trommel, a rotating blade type sorter, a compression sorter, a wind sorter, or the like can be adopted.
As the incinerator 13, for example, a stoker furnace, a gasification melting furnace, a swirling melting furnace, or the like can be adopted.
As the exhaust gas treatment device, for example, a bag filter for removing fly ash, a temperature reducing tower for cooling exhaust gas, an activated carbon tower, or the like can be adopted.
As the waste dewatering device 22 and the digested sludge dewatering device 24, for example, a screw press, a centrifugal dehydrator, a belt press, a filter press, or the like can be adopted.
Instead of these, impurities may be removed by a simple device such as a screen.
Furthermore, in the devices constituting the waste treatment facility according to the present embodiment, other conventionally known devices can be employed in place of the above-described examples as long as the effects of the present invention are not significantly impaired.

Next, a waste disposal method using such a waste disposal facility will be described.
The waste housed in the waste pit 11 is supplied to the sorting device 12 through the waste supply path L2 through the waste introduction path L1.
At this time, by supplying the waste to the separation device 12 via the crushing device and the foreign matter removing device, the waste is crushed by the crushing device to facilitate the separation of the organic substance in the separation device 12. In addition, it is possible to reduce the load on the sorting device 12 by removing metal and other foreign matters by the foreign matter removing device.
Moreover, it is possible to similarly reduce the load on the sorting device 12 by removing coarse foreign matters and the like by hand sorting instead of removing foreign matters by the equipment.
In this sorter 12, organic waste suitable for methane fermentation such as food waste is selected as waste for methane fermentation, and the supplied waste is divided into two with the remainder as waste for incineration.
This incineration waste is supplied to the incineration waste pit 31 through the incineration waste supply path L3, stored once, then supplied to the incinerator 13 through the incinerator supply path L21, and included in the incineration waste. Incinerate organic waste such as wood chips and plastic waste.
Since the exhaust gas generated by this incineration usually contains fly ash etc. at a high temperature, it is cooled and ash removed by passing it through an exhaust gas treatment device (not shown) separately provided in the incineration facility. Let it drain.
In addition, inorganic waste such as metal scrap contained in the incineration waste is discharged out of the system from the incinerator 13 through the incombustible discharge route L14.

  In this way, a series of incineration processes such as the introduction of waste into the waste pit 11, the discharge of exhaust gas and the discharge of non-combustible materials such as metal scraps, etc. are performed, and the separation device 12 separates it as waste for methane fermentation. The organic waste thus produced is supplied to the methane fermentation facility 20 to carry out a methane fermentation treatment process.

In this methane fermentation process, first, the waste for methane fermentation is introduced into the mixing device 21 through the waste supply route L4 for methane fermentation, and the mixed device 21 is mixed and stirred together with dilution water to form a mixed solution.
At this time, the organic substances contained in the waste for methane fermentation are dispersed in the mixed solution, but the water content and the total nitrogen concentration of this mixed solution are in a state suitable for methane fermentation. It is preferable to adjust the amount of dilution water (dilution ratio) to be mixed with the waste for methane fermentation.
In addition, when acid fermentation is performed together with the mixing treatment, the organic substance can be changed into a property that facilitates methane fermentation and can be easily dissolved in water. More organic substances can be contained on the liquid component side that is discharged when the solid-liquid separation is carried out at 22.

The dilution water used at this time includes waste pit drainage, incineration waste pit drainage, cleaning wastewater, and any wastewater in exhaust gas treatment water discharged from the exhaust gas treatment device, or in these Use a mixed waste water mixture.
Waste to be incinerated is stored in the waste pit 11 together with organic waste to be methane-fermented, and sewage (waste pit drainage) exuded from this waste contains a large amount of organic substances. It is contained in.
The waste pit 31 for incineration stores the waste to be incinerated alone, and the sewage exuded from this waste (waste waste pit drainage) usually contains organic substances. Yes.
Moreover, since the sewage exuded from the waste adheres to the transporting vehicle that transports the waste, the organic substance is also contained in the cleaning wastewater that washed the transporting vehicle.
In addition, since the apparatus with which the incineration equipment 10 is equipped with not only a transport vehicle but handles a waste, the organic substance is normally contained for the same reason.
Therefore, by using such wastewater as dilution water, organic substances contained in these wastewater can be methane-fermented in the methane fermentation tank 23, and an increase in methane gas yield in the methane fermentation facility 20 can be expected. .

Normally, from the incineration facility, the wastewater from the workers engaged in incineration (drainage from baths, toilets, sinks, etc.) and the ground (floor surface) that corresponds to the waste transfer route Cleaning waste water that was washed in various incineration equipment is discharged.
In addition, if the incinerator is equipped with a boiler for heat recovery, the wastewater discharged from the deionized water device for regenerating the boiler water (recycled wastewater) and the blower wastewater from the boiler are also discharged. Is done.
Furthermore, exhaust gas cleaning wastewater (wet cleaning wastewater) in the wet cleaning device is discharged from the exhaust gas processing device as exhaust gas processing water.
Among the wastewater discharged from such an incineration facility, the waste pit wastewater has the highest organic substance content and is most useful for increasing the methane gas yield in the methane fermentation facility 20.

Here, in a general waste treatment facility, waste pit drainage has a large fluctuation in discharge amount, and BOD in the waste pit drainage also has a large fluctuation. In the case of treatment by the wastewater treatment facility, it is necessary to install a wastewater treatment facility that assumes the maximum load, and it is necessary to install an excessive wastewater treatment facility compared to the amount of wastewater.
In addition, there is a method in which waste pit wastewater is sprayed into the incinerator without performing wastewater treatment, but in this case, the thermal energy in the furnace is taken away by evaporation of the sprayed water, so incineration There is a risk of reducing the operating efficiency of the furnace.
In contrast, in this embodiment, waste pit drainage is used as dilution water, so it can be effectively used as a methane generation source in a methane fermentation tank, and an excess wastewater treatment facility is provided for waste pit wastewater treatment. There is no need, and the risk of reducing the operating efficiency of the incinerator can be reduced.

Furthermore, by using it as dilution water together with other wastewater (transportation vehicle wastewater and exhaust gas cleaning wastewater), fluctuations in BOD and discharge amount of waste pit wastewater can be mitigated by other wastewater, which is necessary as dilution water A certain amount of water can be secured.
Among these, the exhaust gas cleaning waste water contains almost no ammonia etc., so that it is used together with the waste pit waste water, and the ammonia contained in the waste pit waste water causes ammonia inhibition in the methane fermentation process. Diluted water with a reduced ammonia concentration can be obtained to such an extent that it can be sufficiently prevented.
Moreover, since the exhaust gas cleaning wastewater is usually sprayed and treated in the incinerator, the exhaust gas cleaning wastewater can be used as dilution water to reduce the amount of water sprayed in the furnace. A reduction in the operating efficiency of the furnace can be prevented.

In addition, cleaning wastewater that has been used to clean waste handling equipment can be used in place of cleaning wastewater for transportation vehicles in that it is easy to secure the amount of water and contains organic substances as well as cleaning wastewater for transportation vehicles. The same kind of effect is expected.
In addition, incineration waste pit drainage from incineration waste pits also contains organic matter, and if this is used as dilution water, it can be effectively used as a methane generation source in a methane fermentation tank, and it is necessary to provide an excess water treatment facility. No.
In addition, if necessary, it is possible to further add domestic wastewater to make dilution water.
The waste water discharged from the incineration facility 10 usually needs to be purified to a level at which it can be discharged into a river or the like in the waste treatment facility or outside the waste treatment facility.
Therefore, by using more waste water discharged from the incineration facility 10 as dilution water, the load of these waste water treatment (purification) can be reduced, and the merit in terms of environment and economy can be exhibited more greatly. .

The mixed liquid prepared by mixing the dilution water and the waste for methane fermentation is supplied to the waste dewatering device 22 through the mixed liquid supply path L7.
If necessary, a heavy material such as metal mixed in the mixing device 21 may be separated in advance by specific gravity separation or the like before supplying the mixed solution to the waste dewatering device 22.
In this waste dewatering device 22, the mixed liquid is separated into a solid content and a liquid in which organic substances contained in the waste for methane fermentation are dispersed, and the liquid in this is treated liquid for methane fermentation. As well as supplying to the methane fermentation tank 23 through the liquid supply path L8, the solid content is supplied to the aerobic fermentation tank 25 through the solid content supply path L9.

In the methane fermentation tank 23, methane gas is generated by decomposing organic substances contained in the liquid to be treated by methane fermentation of methane bacteria in an anaerobic environment.
At this time, the organic substances contained in the dilution water together with the organic substances contained in the waste for methane fermentation are methane-fermented, so that more methane gas is generated compared to conventional waste treatment facilities. Can do.
The generated methane gas is discharged out of the system through the methane gas discharge path L10 and used as an energy source in the waste treatment facility or other places.
In the methane fermentation tank, the organic substance contained in the liquid to be treated is methane-fermented while it moves from introduction to discharge of the liquid to be treated (residence time in the tank). It is preferable to adjust the supply amount of the liquid to be treated to the methane fermentation tank 23, adjust the BOD concentration of the liquid mixture in the mixing device 21 so that sufficient methane fermentation is performed.

In the digested sludge dewatering device 24, the digested sludge is removed from the digested liquid, the treated water in which the content of organic substances is sufficiently reduced is discharged out of the system through the treated water discharge path L13, and the digested sludge is supplied to the digested sludge. It introduce | transduces into the aerobic fermenter 25 through the path | route L12.
In addition, about the treated water after removing digested sludge from a digested liquid, processes, such as a nitrification denitrification process, are normally implemented.
In the aerobic fermentation tank 25, the solid content of the mixed liquid separated into solid and liquid by the waste dewatering device 22 is fermented together with the digested sludge, and the fermentation residue after the fermentation treatment is incinerated through the fermentation residue supply path L15. And incinerated in the incinerator 13.
Although not described in detail here, the exhaust gas generated in the aerobic fermentation tank 25 may be processed by providing a separate exhaust gas treatment device, or may be processed by being put into an incinerator.

As described above, in the waste treatment facility and the waste treatment method of the present embodiment, the waste water containing the organic substance of the incineration facility is used as dilution water when preparing the liquid to be treated for methane fermentation. More methane gas can be produced in the fermentation facility.
Moreover, the amount of waste water discharged from the incineration facility can be reduced, and the load of waste water treatment is reduced.
Therefore, the environmental and economic advantages of the waste treatment facility and the waste treatment method can be improved.

Next, a second embodiment will be described with reference to FIG.
This FIG. 2 is also a flow chart showing the waste treatment facility as in FIG.
As can be seen from this figure, the waste treatment facility in the first embodiment was equipped with an aerobic fermentation tank 25 as a drying facility for digested sludge, whereas in this second embodiment, Is equipped with equipment to dry sludge using heat from the incineration equipment.

Specifically, in the waste treatment facility in the second embodiment, a sludge drying device 30 is provided instead of the aerobic fermentation tank 25 in the first embodiment, and the heat of the incinerator 13 is transferred to the heat medium. Supply path L18 for supplying the sludge drying apparatus 30 with heat, and a heating medium return path for returning the heat medium whose temperature has been lowered after transferring heat to the sludge drying apparatus 30 to the incinerator 13 It differs from the waste treatment facility in the first embodiment in that L19 is newly provided.
Furthermore, the waste treatment facility according to the second embodiment is provided with a dry exhaust gas supply path L20 for supplying dry exhaust gas generated during drying to the incinerator 13 for processing. Different from the waste treatment facility in form.

A method for drying digested sludge in such a waste treatment facility will be described below.
Although the method for recovering the heat to be supplied to the sludge drying device 30 in the incinerator 13 is not particularly limited, for example, air can be used as the heat medium.
The air as the heat medium is heated by indirectly exchanging heat between the air as the heat medium and the high-temperature exhaust gas before the temperature reduction of the incinerator, and the air is supplied to the heat supply path L18 to be a heat source for drying. It can be.
Moreover, when the incinerator is provided with the boiler, it is good also as a structure which indirectly heat-exchanges the vapor | steam and heat medium which generate | occur | produce in a boiler.

When the digested sludge is dried, the heat medium (for example, air) heated in the incinerator 13 is supplied to the sludge drying device 30 through the heat supply path L18, and the water is evaporated by indirectly heating the sludge.
Then, the sludge sufficiently dried by the heat medium is supplied to the incinerator 13 through the fermentation residue supply path L15 and incinerated.
At the same time, the heat medium (air) used for heating is returned to the incinerator 13 through the heat medium return path L19 and reused by heating by indirectly exchanging heat with the incinerator exhaust gas.

Further, the exhaust gas containing water vapor generated in the sludge drying device 30 is sent to the incinerator using the dry exhaust gas supply path L19 and incinerated with combustible materials.
In the present embodiment, the exhaust gas containing water vapor generated in the sludge drying device 30 is sent to the incinerator. However, the present invention is not limited to this, and the water vapor may be separated and used as dilution water.
Moreover, it is good also as a structure which throws into the mixing apparatus 21 the waste gas containing water vapor | steam.
By putting it in the mixing device, the heat of the exhaust gas can be used for heating the mixing device.
In the present embodiment, the heat generated in the incinerator is recovered and used for drying sludge. However, the present invention is not limited to this.
For example, when methane gas generated in methane fermentation is used as a gas engine or boiler in a waste facility, the heat generated here may be recovered to dry the sludge.

In addition, in this embodiment, although the structure which heat-exchanges the air and sludge which are heat media indirectly heat-exchanges is illustrated, the structure which makes heated air contact directly to digested sludge is also employable. .
In this case, the heat medium return path L19 is unnecessary, but a large amount of dry exhaust gas containing odorous components is generated when heated air and sludge are brought into direct contact.
For this reason, the amount of air supplied to the incinerator 13 through the dry exhaust gas supply path L <b> 20 increases, which may hinder the operation of the incinerator 13.
In addition, even if an exhaust gas treatment device is provided separately, the exhaust gas treatment device itself may be large in size, which is not preferable.
For this problem, as in this embodiment, the method of indirectly heating sludge using a heat medium can be used repeatedly without contamination of the heat medium, and the exhaust gas generated in the drying process. This is preferable in that the amount can be reduced.

In the above-described embodiment, the waste treatment facility and the waste treatment method are exemplified as described above, but the waste treatment facility and the waste treatment method of the present invention are not limited to those illustrated above. .
For example, a part of the configuration of the above illustrated waste treatment facility can be deleted or replaced with another conventionally known configuration, and a conventionally known configuration can be added to the above illustrated waste treatment facility. Is also possible.
Also, in the waste treatment method, a part of the above-exemplified steps can be deleted or replaced with other conventionally known steps, and the above-exemplified waste treatment methods are adopted in the conventionally known treatment methods. It is also possible to add a process that is performed.
For example, in the present embodiment, when the waste is supplied from the mixing device to the methane fermentation tank, the waste is solid-liquid separated using a dehydrator, but the present invention is not limited to this, and there is no solid-liquid separation. Alternatively, the waste may be supplied directly from the mixing device to the methane fermentation tank.
In this case, a solid content supply path from the dehydrator to the sludge drying facility is not necessary.
Moreover, you may provide the screen which removes the fermentation unsuitable thing in a to-be-processed object simply instead of a dehydrator.
Further, in the present embodiment, an incineration waste pit is provided, and an example in which the waste pit drainage obtained here is used as dilution water is exemplified, but the present invention is not limited thereto, and the amount of wastewater obtained from the incineration waste pit is When the amount is small, it may be sprayed in an incinerator or separately subjected to waste water treatment.
Also, digested sludge is removed from the digested liquid or digested liquid from the methane fermenter in a range that does not cause ammonia inhibition in the methane fermentation process (for example, the total nitrogen concentration of the material to be treated fed into the methane fermenter is 4000 mg / l or less). It is good also as a structure which returns the treated water after this to the front | former stage side rather than a methane fermentation tank.

The figure which shows the flow of the waste disposal facility of this embodiment. The figure which shows the flow of the waste disposal facility of other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Incineration equipment 11 Waste pit 12 Sorting device 13 Incinerator 14 Cleaning device 14a Drain pit 20 Methane fermentation equipment 21 Mixing device 22 Dehydration device (waste dehydration device)
23 Methane fermentation tank 24 Dehydrator (digested sludge dewaterer)
25 Aerobic Fermenter 30 Sludge Dryer 31 Incineration Waste Pit L1 Waste Introduction Route L2 Waste Supply Route L3 Incineration Waste Supply Route L4 Methane Fermentation Waste Supply Route L5 Waste Pit Waste Supply Route L6 Wash Drain Supply path L7 Mixed liquid supply path L8 Processed liquid supply path L9 Solid content supply path L10 Methane gas discharge path L11 Digested liquid supply path L12 Digested sludge supply path L13 Treated water discharge path L14 Incombustible substance discharge path L15 Fermentation residue supply path L16 Exhaust gas discharge Path L17 Exhaust gas treated water supply path L18 Heat supply path L19 Heat medium return path L20 Dry exhaust gas supply path L21 Incinerator supply path L22 Incineration waste pit drainage supply path

Claims (8)

An incineration facility in which waste is incinerated, and a methane fermentation facility in which a part of the organic waste contained in the waste is supplied from the incineration facility and subjected to methane fermentation, and the organic A mixing device in which waste and dilution water are mixed and an organic substance contained in the organic waste is dispersed in the dilution water, and the organic material dispersed in dilution water in the mixing device is the A methane fermentation tank that is introduced together with dilution water and methane-fermented is a waste treatment facility provided in the methane fermentation facility,
Waste water discharged from the incineration facility is used for the dilution water,
The incineration facility is provided with a waste pit in which the waste to be incinerated is stored together with the organic waste supplied to the methane fermentation facility, and the dilution water is supplied from the waste pit. Waste pit drainage is used,
Either the cleaning waste water that washed the transport vehicle that transported the waste or the cleaning waste water that washed the device provided in the incineration facility is used for the dilution water together with the waste pit waste water. Waste treatment facility characterized by.   The incineration facility includes an exhaust gas treatment device having a wet cleaning device that wet-processes exhaust gas generated by the waste incineration treatment, and waste water from the wet cleaning device is diluted with the waste pit waste water. The waste treatment facility according to claim 1, which is used for water. An incineration facility in which waste is incinerated, and a methane fermentation facility in which a part of the organic waste contained in the waste is supplied from the incineration facility and subjected to methane fermentation, and the organic A mixing device in which waste and dilution water are mixed and an organic substance contained in the organic waste is dispersed in the dilution water, and the organic material dispersed in dilution water in the mixing device is the A methane fermentation tank that is introduced together with dilution water and methane-fermented is a waste treatment facility provided in the methane fermentation facility,
Waste water discharged from the incineration facility is used for the dilution water,
The incineration facility is provided with a waste pit in which the waste to be incinerated is stored together with the organic waste supplied to the methane fermentation facility, and the dilution water is supplied from the waste pit. Waste pit drainage is used,
The incineration facility includes an exhaust gas treatment device having a wet cleaning device that wet-processes exhaust gas generated by the waste incineration treatment, and waste water from the wet cleaning device is diluted with the waste pit waste water. Waste treatment facility used for water.   The said incineration equipment is further equipped with the separation apparatus which the said waste is introduce | transduced from the said waste pit, and is separated into the said waste to be incinerated and the said organic waste. The waste disposal facility according to any one of the above. Waste is incinerated in an incineration facility, and a part of the organic waste contained in the waste is supplied to a methane fermentation facility having a methane fermentation tank. In the methane fermentation facility, the organic waste and diluted water are supplied. And the organic substance contained in the organic waste is dispersed in the diluted water, and the organic substance dispersed in the diluted water is introduced into the methane fermenter together with the diluted water to produce methane fermentation. A waste disposal method,
Using the waste water discharged from the incineration facility as the dilution water,
The incineration facility is provided with a waste pit in which the waste to be incinerated is stored together with the organic waste supplied to the methane fermentation facility, and the waste discharged from the waste pit Pit drainage is used for the dilution water,
Either the cleaning waste water that washed the transport vehicle carrying the waste or the cleaning waste water that washed the equipment provided in the incineration facility is used for the dilution water together with the waste pit waste water. Waste disposal method.   The incineration facility is provided with an exhaust gas treatment device having a wet cleaning device for wet processing exhaust gas generated by the waste incineration treatment, and the waste water from the wet cleaning device is diluted with the waste pit waste water with the dilution. The waste disposal method according to claim 5, which is used for water. Waste is incinerated in an incineration facility, and a part of the organic waste contained in the waste is supplied to a methane fermentation facility having a methane fermentation tank. In the methane fermentation facility, the organic waste and diluted water are supplied. And the organic substance contained in the organic waste is dispersed in the diluted water, and the organic substance dispersed in the diluted water is introduced into the methane fermenter together with the diluted water to produce methane fermentation. A waste disposal method,
Using the waste water discharged from the incineration facility as the dilution water,
The incineration facility is provided with a waste pit in which the waste to be incinerated is stored together with the organic waste supplied to the methane fermentation facility, and the waste discharged from the waste pit Pit drainage is used for the dilution water,
The incineration facility is provided with an exhaust gas treatment device having a wet cleaning device for wet processing exhaust gas generated by the waste incineration treatment, and the waste water from the wet cleaning device is diluted with the waste pit waste water with the dilution. A waste treatment method characterized by being used for water. The incineration facility further includes a separation device that separates the waste from the waste pit into the waste to be incinerated and the organic waste, and the separation device waste treatment method according to any one of claims 5-7 to separate the incineration for waste and the organic waste.

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