JP2005169378A - Method and apparatus for volume reducing and detoxifying treatment of waste and pollutant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform an incineration treatment of general wastes and industrial wastes in order to perform the volumetric reduction of those wastes and to simultaneously perform a detoxification treatment of incineration ash (main ash), incineration fly ash, heavy metals causing the pollution of soil, dioxins and wastes or the like embedded in a final disposal plant in the past by more reduced energy, and to recycle those wastes as a raw material of building resources or civil engineering resources. <P>SOLUTION: The incineration ash (main ash) containing dioxins and heavy metals, the incineration fly ash and the wastes embedded in the soil final disposal plant in the past are mixed with RDF (refuse-derived fuel) or RPF (recycle plastic fuel), waste plastics or wood refuses being waste fuels and the resulting mixture is baked. The baked mixture is further heat-treated (baked) using an incinerator exhaust gas low in the concentration of oxygen not only to decompose dioxins but also to volatilize main harmful heavy metals and the non-combustion carbon components of RDF or RPE, waste plastics or wood refuses are allowed to act as a reducing agent in order to prevent the occurrence of hexavalent chromium unexpected in volatilization to perform detoxification. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

In the present invention, exhaust gas generated from an incinerator is used as hot air (heat source) necessary for the firing treatment, thereby reducing waste volume in the incinerator and detoxifying pollutants in the firing furnace. Related to technology
In particular, the pollutants were landfilled at the final disposal site as well as complex pollutants such as incineration ash, incineration fly ash, and contaminated soil containing dioxins, organic chlorine compounds such as PCB, and harmful heavy metals. The present invention relates to a processing method and a processing apparatus that can excavate waste (composite pollutants) and detoxify it, and can be reused as a raw material for construction and civil engineering.

In recent years, as society's interest in environmental issues has increased, laws related to recycling, waste, and soil contamination have been developed, and incineration ash and incineration fly ash generated from incineration facilities, contaminated factory sites, There is a need for technology development that can detoxify harmful substances in industrial waste and the like, and can be recycled as resources with less energy.
In addition, new construction of waste landfill sites is difficult to construct due to the opposition movement of residents, and the shortage has become a serious social problem, and the waste landfilled in the contaminated final disposal site is detoxified If it can be reused as a resource, it can be expected to extend the life of the landfill.

Detoxification technology for each pollution source and recycling technology for each detoxification product have already been developed alone.
For example, Japanese Patent Publication No. 6-38863 discloses a technique for decomposing dioxins at a low temperature using a specific drug.
However, there are many compounds that are contaminated by dioxins and are in a complex contamination state such as containing harmful heavy metals.
Also, incineration treatment is performed for the purpose of reducing industrial waste, etc., but this incineration ash may be in a mixed contamination state, and this incineration ash is largely divided into main ash and fly ash. The types of contaminants involved are complex and not single.
Although it is possible to detoxify contaminants sequentially using the corresponding detoxification technology for complex contaminants, each consumes a lot of energy and also consumes dedicated detoxification chemicals. The processing cost increases.
In addition, handling costs such as transportation are increased, and there is a concern about secondary contamination during transportation.

Japanese Patent Publication No. 6-38863

  In view of the technical problems as described above, the present invention is a complex composite-contaminated incineration ash, incineration fly ash, contaminated soil and other various pollutants, as well as disposal buried in a contaminated final disposal site. The purpose is to provide technology that can detoxify objects without using special chemicals and that can be recycled into raw materials for construction and civil engineering materials.

In particular, the present invention not only can reduce the amount of fossil fuel used when using waste heat from an incinerator as an energy for processing for detoxification and recycling of pollutants, but also exhaust gas generated from the incinerator. As a result of discovering that the amount of oxygen is low, and hot air in an oxygen-poor state is used for firing, it is possible to efficiently detoxify complex pollutants that are contaminated with dioxins and contain harmful heavy metals. One of the objectives is to reduce waste treatment costs and prevent secondary contamination by completing incineration of waste and detoxification by firing of pollutants within the same plant. To do.
Furthermore, one of the objectives is to excavate the waste landfilled at the final disposal site, recycle it as a resource, and extend the life of the final disposal site.

In order to achieve the above object, the technical gist of the present invention is to provide an incinerator and a firing furnace in the same site, and to use exhaust gas generated from the incinerator as a firing gas for the firing furnace.
That is, in the present invention, incineration ash / incineration fly ash / contaminated soil, which is a composite pollutant containing organic chlorine compounds such as dioxins or PCBs and harmful heavy metals, using exhaust gas generated from an incinerator.・ Waste that has been reclaimed in the past at the final disposal site is rendered harmless by firing, and this fired product is used as a raw material for construction and civil engineering materials.
An incinerator refers to an incinerator for the purpose of combustion, whereas a calciner refers to an apparatus that controls the intrusion of outside air and heats the processed material.
Therefore, the baking furnace referred to in the present invention includes a roasting furnace and the like.
Here, having an incinerator and a firing furnace in the same site means that the incinerator is operated in association with each other, and the site where they are installed is not necessarily the same owner. There is no need.

  In the present invention, when wood waste fuel or RPF fuel (Refuse Pepar and Plastic Fuel) or both are mixed with pollutants, not only can the fuel for firing be reduced, but also heavy metals can be reduced during firing. There is an excellent effect that can be done.

More specifically, the incineration process in a normal incinerator (incineration equipment) and the incineration ash, incineration fly ash, contaminated soil, and waste landfilled in the past disposal site for each particle size with a comb machine Separating and mixing the crushed wood waste fuel or RPF fuel or both into the raw material, and charging the calcining furnace (firing kiln) with a quantitative supply device, exhaust gas generated from the incinerator and exhaust gas generated from the calcining furnace It includes a step of rapidly reducing the temperature with a temperature reducer, collecting and discharging dust with a bag filter, and a combustion air introduction device for adjusting the oxygen concentration in the firing kiln.
The RPF fuel may be RDF (Refuse Derived Fuel) or waste plastic.
The incinerated fly ash may be alkaline fly ash containing a large amount of slaked lime discharged from the bag filter.

By detoxifying the incinerated ash, incinerated fly ash, contaminated soil, and waste landfilled in the past disposal site, various pollutants can be safely detoxified simultaneously.
In addition, if raw material and product storage pits are provided, it is possible to cope with changes in the amount of receipt and shipment, and to make harmless and recyclable efficiently.

According to the detoxification treatment of the pollutant according to the present invention, the waste heat of the exhaust gas from the incinerator is used, so that firing can be performed in a relatively low oxygen atmosphere. Therefore, pyrolysis and dechlorination of organic chlorine compounds are easy.
In addition, since firing is performed in a relatively low oxygen atmosphere, heavy metals such as lead are unlikely to become lead oxide having a high volatility temperature. Easy.

  Crushed wood scraps and RPF fuel are used to save energy of the burner heat source necessary for firing due to the fixed carbon contained in them, and the fixed carbon possessed has a reducing action on heavy metals in the firing kiln and is particularly harmful. Suppresses generation of valent chromium and promotes heavy metal volatilization.

Mixing incinerated ash that has been made to a constant particle size with a vibrating sieve and magnetic separator and waste landfilled in the past in the incineration fly ash and final disposal site makes the particle size of the baked product constant and facilitates recycling. .
In addition, it is known that alkali fly ash containing slaked lime discharged from bag filters that are frequently used in incineration facilities in recent years is fixed when fired alone. However, when crushed wood chips or RPF fuel is mixed, it is fixed. To prevent.

The combustion air supplied to the firing kiln burner during firing adjusts the oxygen concentration and temperature in the firing kiln by adjusting the balance with the exhaust gas supplied from the incinerator.
Further, the amount of adjustment may be adjusted by an exhaust blower or a damper attached to the incinerator outlet, using a feedback signal from the incinerator pressure measuring device, or manually.
It is a known fact that the firing temperature rises when the oxygen concentration is lowered. In order to volatilize the heavy metal, low oxygen operation is preferable. Therefore, when the oxygen concentration is lowered, the temperature in the firing furnace is excessively increased and the processed product is melted.
The present invention is characterized in that by introducing the incinerator exhaust gas, the furnace temperature is not increased to the melting temperature of the processed material while keeping the inside of the furnace in a low oxygen state.
Incidentally, the low oxygen state generally indicates 7% by volume or less.

The fuel for the combustion burner may be any of heavy oil, kerosene, and recycled oil.
The fuel for the combustion burner is preferably regenerated oil when adjusting the running cost and the oxygen concentration in the calcined kiln.

  In order to prevent scattering of processed products and products from the facility, it is preferable to fold the sealed structure so that external scattering does not occur as much as possible.

According to the present invention, incineration treatment of general waste and industrial waste is carried out, the amount of waste is reduced and reduced, and it is contained not only in the generated incineration ash and fly ash but also in pollutants received from others. Waste wood, RPF, RDF, or waste plastics that have been crushed from incinerated ash, incineration fly ash, soil, waste landfilled in the final disposal site, etc., contaminated with hazardous organic chlorine compounds such as dioxins and heavy metals By adding a certain amount at a certain rate and heat-treating, the same equipment can be rendered harmless.
Conventionally, the incineration facility and the firing facility were separated, but according to the present invention, the incineration facility and the firing facility are installed on the same site, and this occurs due to the movement of substances containing harmful substances. Not only can cost and energy be saved, but there is no concern about cross-contamination associated with movement.
In particular, the incineration ash and incineration fly ash generated from the self-equipment can be made harmless in the self-equipment, and there is a feature that does not generate new waste generated to treat the waste.
In addition, it has the excellent effect of being able to treat pollutants caused by toxic organochlorine compounds and heavy metals at the same time, and at the same time, uses incinerator waste heat to reduce the energy consumption associated with detoxification and to produce waste as fuel. It is possible to treat waste using waste, in which the solidified fuel and waste plastic that is waste can be used as thermal energy.
In the present invention, it is possible to detoxify a complex and complexly polluted substance, so that it becomes possible to detoxify waste by digging up waste in a compounded state that has been buried in the past at the final disposal site. It can contribute to life extension of the field.
In addition, the detoxified product has an excellent feature of contributing to a recycling-oriented society in which it can be reused as various raw materials.

  FIG. 1 schematically shows the overall flow of an incineration system according to the present embodiment and a method for simultaneously detoxifying contaminants such as incineration ash, incineration fly ash, contaminated soil, and waste landfilled in the final disposal site. Shown in

  FIG. 2 shows an enlarged view of the incinerator (incineration facility) portion, FIG. 3 shows an enlarged view of the exhaust gas treatment system portion of the incinerator, and FIG. 4 shows an enlarged view of the firing furnace (firing kiln) portion. .

  Hereinafter, based on a flowchart, the incineration system and the simultaneous detoxification process method by baking are demonstrated.

  As shown in FIG. 1 (FIG. 2), the general waste and the industrial waste to be treated are transported to the platform 13a by a transport freight vehicle or the like and are thrown into the waste pit 13b.

  The general waste and the industrial waste to be treated are mixed by the garbage crane 12 so that the calories of the incinerated products become constant. This mixing process is preferably performed.

  A certain amount of incinerated material is thrown into the solid material charging machine 10 with the double door type inner door 10b closed and the outer door 10a opened.

The outer door of the solid material charging machine 10 is closed and the inner door is opened. This operation prevents the exhaust gas in the waste incinerator from leaking to the outside air.
The incinerated product is pushed out into the incinerator by the pusher built in the solid material charging machine 10. When the pusher returns to the home position, the inner door 10b is closed. Thereafter, the outer door 10a is opened and the waste input by the garbage crane 12 is awaited. The power of the pusher built in the solid material feeder 10 may be driven by hydraulic power by the hydraulic unit 11 or motor power may be used.

General waste and industrial waste thrown into the incinerator 1 fall to the uppermost hearth 1a.
The incinerated product is ignited by the ignition burner 6 and the incineration process starts. The type of incinerator may be a multi-stage hearth system, a stalker system, or a fluidized bed system. The fuel for the ignition burner uses heavy oil supplied from the A heavy oil tank 16. The fuel may be waste oil supplied from the waste oil tank 17.
In FIG. 1, the connection relation of the piping and the connection relation of the control are indicated by numbers indicated by *.
For example, * 2 shown in the A heavy oil tank 16 indicates that it is connected to the ignition burner 6, the secondary combustion burner 9, and the like.

  In order to stir the thrown-in incinerator, the burning incinerator is moved to the next stage by the stirring pusher 3. At that time, the incinerated product is agitated, and more efficient incineration is performed. The incinerated materials are sequentially fed into the incinerator 1 from the solid material charging machine 10. It is not necessary to wait for the incinerated product to be completely burned.

  Combustion air is supplied by forcibly sending air into the incinerator 1 during combustion by the combustion fan 8. The exhaust gas in the furnace is agitated by the agitating fan 7 so that the combustion air and the combustion gas are efficiently mixed, and the generation of carbon monoxide due to incomplete combustion is suppressed.

At the same time, the waste acid / waste alkali may be sprayed and burned from the waste acid / waste alkali tank 18 into the incinerator 1.

  The number of multi-stage hearths is about 2-6.

Sequentially, the incinerator falls to the lower hearth while being stirred and burns completely. The amount of heat loss of the main ash of the incinerated product falling to the lowest stage 1b is less than 10%. The incinerated incinerated ash that has reached the bottom is conveyed to an ash scraper 19 that is sealed with water by an ash pusher 4.
The incinerated ash transported from the ashing scraper 19 retains moderate moisture and is stored in the ash storage facility 20. Incinerated ash with moderate moisture prevents the risk of fire due to re-ignition and the deterioration of the work environment due to scattering.

Since the temperature of the incinerated ash does not rise to the melting temperature in the multi-stage hearth portion of the incinerator 1 by using the water cooling wall 5, the generation of clinker is prevented, and the stirring pusher 3 and the ash extraction pusher 4 by the clinker are prevented. It features a structure that does not hinder the operation of
Water supplied to the water-cooled radiator wall portion 5 is supplied from the cooling water tank 14, and the generated steam is returned to the cooling water tank 14 for reuse of the hot water mist generated by the steam separator 15 (* 4 in FIG. 1). Indicates connection).

Exhaust gas generated by combustion is heated to 800 ° C. or higher by the secondary combustion burner 9 in the secondary combustion chamber 2, and the unburned fixed carbon that becomes a reaction field for generating dioxins is decomposed and burned to discharge dioxins. Suppress. At the same time, a small amount of carbon monoxide generated by incineration is also decomposed.
The secondary combustion burner 9 is automatically controlled by the internal temperature of the secondary combustion chamber 2.
In FIG. 1, TICR: temperature control, PIC: pressure control, LAC: liquid temperature control.

  In the enlarged view, the exhaust gas discharged from the secondary combustion chamber 2 is introduced into the precooler 21 as shown in FIG. The water spray compressor 25 mixes the exhaust gas and the finely divided water, and reduces the temperature of the exhaust gas to approximately 700 ° C. or less. The precooler 21 is equipped with an emergency exhaust damper 24. When the combustion proceeds rapidly, such as when the incinerated product contains explosive substances, the exhaust gas is discharged from the outside air to ensure the safety of facilities and workers. To release.

  The exhaust gas whose temperature has been reduced to approximately 700 ° C. or lower is further reduced from 600 ° C. to 500 ° C. by the heat exchanger 22. The air used for temperature reduction is supplied by a heat exchanger fan 23 controlled by the exhaust gas temperature.

  The heat-exchanged air is taken out as warm air and can be used for various uses such as waste heat utilization applications such as white smoke prevention devices and heating hot air.

  The amount of exhaust gas passing through the precooler 21 and the heat exchanger 22 can be adjusted by controlling the air volume of the exhaust blower 26 supplied to the firing kiln 27.

The exhaust gas that has passed through the heat exchanger 22 is introduced into the temperature reducer 36. The temperature-reduced water supplied from the temperature-reduced water tank 38 is pressurized by the temperature-reducing pump 37, mixed with the compressed air supplied from the temperature-reducing compressor 39, and sprayed into the temperature-reducing device 36 by the spray nozzle. At that time, the exhaust gas temperature is rapidly reduced to approximately 200 ° C. or less.
The temperature is rapidly decreased between 300 to 500 ° C., which is the resynthesis region temperature of dioxins, to prevent resynthesis of dioxins.

  Dust contained in the exhaust gas is settled and separated in the temperature reducer 36. The separated dust settles in the water-sealed ash scraper 40. Dust that has been drained simply by the ashing scraper 40 is stored in the fly ash storage facility 41. Since fly ash contains moderate moisture, the amount of fly ash scattered is very small.

  The exhaust gas whose temperature has been reduced to approximately 200 ° C. or less by the temperature reducer 36 is mixed with the powdered activated carbon supplied from the activated carbon spraying device 48 and the powdered slaked lime supplied from the slaked lime spraying device 49. At that time, a mixture of activated carbon and slaked lime may be used.

  The activated carbon and slaked lime mixed in the exhaust gas in powder form pass through the bag filter 42. At that time, harmful substances such as dioxins contained in the exhaust gas are adsorbed on the activated carbon on the surface of the filter cloth of the bag filter 42. Acid gases such as hydrogen chloride gas and sulfurous acid gas contained in the exhaust gas are collected on the filter cloth in the form of salt by the neutralizing action of slaked lime.

  The activated carbon adsorbing dust and reaction salts, unreacted slaked lime and harmful substances collected on the filter cloth surface of the bag filter 42 is removed by compressed air supplied by the pulse compressor 43. They are conveyed to a paddle mixer 45 by a rotary valve 44 installed under the bag filter 42.

The paddle mixer 45 prevents the scattered dust and the like from scattering by supplying water appropriately. In that case, you may mix the chelating agent etc. which are supplied from the chelating agent tank 46 which is a fly ash processing chemical | medical agent simultaneously. The fly ash containing moderate moisture discharged from the paddle mixer 45 is stored in the dust storage facility 47.
The stored dust contains concentrated heavy metals and can be recovered as valuable metals by smelting techniques such as Yamamoto reduction.

The exhaust gas discharged from the bag filter 42 attracts exhaust gas in an amount corresponding to the pressure in the system to the chimney 54 by the induction fan 50 by the induction fan control device 52 powered by the instrumentation compressor 51. The chimney 54 is equipped with a carbon monoxide concentration / oxygen concentration meter 53 to control combustion in the system.
The kiln firing furnace system has the same exhaust gas treatment facility as the incinerator system, and an enlarged view is omitted. FIG. 1 shows the exhaust gas treatment facility of the incinerator system with reference numerals in the 100s.
In order to make it easy to understand, the exhaust gas treatment facility of the firing furnace and the exhaust gas treatment facility of the incinerator are separately displayed.
In particular, as shown in the flow chart of FIG. 5, when the exhaust gas treatment facilities of both the firing furnace and the incinerator are shared, the equipment cost can be reduced and the energy can be saved.
In addition, as shown in FIG. 1, if an exhaust gas treatment facility is separately installed in each of the incinerator and the firing furnace, and there are two systems, there is an advantage that the conditions can be set independently, so depending on the type of waste It is good to choose.

  As the incineration ash (main ash) generated in the incinerator 1 and the incineration ash (main ash) / incineration fly ash received from others may contain clinker, etc., as shown in the enlarged view 4, By the crusher 55, it is crushed to approximately 50 mm under. Incineration ash (main ash) and incineration fly ash may be contaminated soil, sediment, crushed material, and sediment.

  Incineration ash (main ash), incineration fly ash, or contaminated soil that has received detoxification treatment accepted from others, soil that has been excavated, bottom sediment, crushed material, or sediment that does not require crushing treatment It may be input directly from the trommel 56. In addition, crushed wood waste fuel and RPF fuel can be mixed in order to reduce heating fuel and reduce heavy metals. If the raw material contains a large amount of fixed carbon, adjust the auxiliary fuel mixing ratio in a timely manner.

  The processed product that has been subjected to crushing treatment and crushing and separation by the trommel 56 is stored in the raw ash pit 57. The raw ash stored in the raw material pit 57 is received and conveyed to the hopper 58 by an input crane or heavy machinery. The belt conveyor 59e supplies the charging device 33a added to the rotary kiln 27.

  The charging device 33a is powered by a hydraulic unit 34, and includes a charging pusher 33b, a double door for shutting off the rotary kiln and the outside air, an outer door, and a charging device 33a by water supplied from the water supply tank 35. Has a water-cooled radiator to protect. The inner door is closed and the outer door is opened when the raw material is charged. When the raw material is fed into the rotary kiln 27, the outer door is closed and the inner door is opened.

  The firing raw material supplied from the input device 33a is input to the rotary kiln 27 by the input pusher 33b. The charging device 33a may be a pusher type or screw type quantitative supply device.

  The heat source used for the firing process in the rotary kiln 27 is mainly the exhaust gas from the incinerator 1, and the inflow amount of the exhaust gas is controlled by controlling the flow rate of the exhaust blower 26. The oxygen concentration of the incinerator exhaust gas is lower than the outside air, and the outside air contains 21% oxygen, whereas the exhaust gas is generally less than 10% and the temperature is 800 ° C. or higher.

  Only the exhaust gas supplied from the incinerator 1 has a kiln combustion burner 30a in order to adjust the temperature with little fluctuation when the amount of heat to be fired is insufficient. The fuel of the kiln combustion burner 30a may be any of heavy oil, kerosene, recycled oil, and waste oil. The flame generated from the burner is converted into high-temperature hot air in the hot-air generating furnace 30b, and acts as high-temperature exhaust gas supplied from the incinerator 1 as a calcination heat source.

In the case of detoxification by firing, it is a known fact that heavy metals contained in the fired product are easily separated by volatilization when fired in a low oxygen state. The hypoxic state generally indicates an oxygen concentration of less than 7%. In a conventional rotary kiln-type firing furnace, if the amount of blown air is reduced in order to perform low oxygen operation, the gas temperature from the hot air generating furnace rises, and if it exceeds 1200 ° C., most kinds of fired products are melted.
When the rotating cylindrical firing furnace melts, it impedes the conveyance of the fired product.

  However, since this method uses exhaust gas having a low oxygen concentration discharged from the incinerator instead of the blown air, it is possible to maintain a firing temperature of 1200 ° C. or lower while maintaining a low oxygen state. In addition, since high temperature exhaust gas is used, the amount of burner fuel used can be greatly reduced.

The rotating cylinder has an inclination angle of about 1 ° to 2 °, and contaminants move in the rotary kiln 27 for a certain period of time and are discharged by sliding due to rotation driven by the drive motor 28.
A lifter or paddle blade for scrubbing contaminants may be mounted in the rotating cylinder.

While the complex contaminants pass through the rotary kiln 27, dioxins and organochlorine compounds such as PCB are thermally decomposed.
Further, a kiln secondary combustion burner 29 is installed at the exhaust gas outlet, and the exhaust gas temperature is heated to approximately 800 ° C. or more to prevent dioxins from being re-synthesized.
Further, an ash scraper 32 is attached to the lower part of the exhaust gas outlet, and the dust generated by stirring in the rotating cylinder is settled and separated.

The separated baked product from which the composite contaminants have been separated is discharged from the rotating cylinder at a product temperature of approximately 800 ° C. and conveyed to the rotary cooler 31.
The rotating cylindrical cooler is provided with an inclination angle of about 1 ° to 2 °. By the sliding due to the rotation, the fired product moves through the rotary cooler 31 whose outer wall is cooled with water for a predetermined time and is discharged.
A lifter or paddle blade for scrubbing contaminants may be mounted in the rotating cylinder.

  The fired product that has been detoxified and cooled to 100 ° C. or less discharged from the rotary cooler 31 passes through the magnetic separator 60 by the belt conveyor 59a, and the metals are sorted. The separated metals are stored in the metal scrap storage facility 62, sold to a recycler, and recycled.

  The fired product is further put into the vibration sieve 61 by the belt conveyor 59b, and the fired product of 10 mm or less is stored in the building civil engineering material storage place (under the particle size 10 mm product storage) 63 by the belt conveyor 59c. A fired product having a size of 10 mm or more is stored in a building civil engineering material storage place (a product storage over a particle size of 10 mm) 64 by a belt conveyor 59d.

An incineration system with a firing furnace was made into a device and tested.
(1) Plant 1: Exhaust gas treatment facility common type whose flow is shown in FIG. 5 (Treatment capacity: incineration amount 2 tons / hour)
(2) Plant 2: Exhaust gas treatment facility individual type whose flow is shown in Fig. 1 (Treatment capacity: incineration amount 2 tons / hour)

The results of the test evaluation at the plant 1 are shown in FIGS. 6 to 8, and the results of the test evaluation at the plant 2 are shown in FIGS. 9 to 12, respectively.
The table shown in FIG. 6 shows that incineration ash (raw ash) mixed with heavy metals is put into the firing furnace of Plant 1 and the waste gas used when incinerating general waste and industrial waste in the incinerator is harmless as a heat source for firing. It is a heavy metal elution test (Environment Agency Notification No. 46) and a content test (Environment Agency Notification No. 19) result of the baked product obtained by the chemical treatment.
Thereby, it turns out that the harmful | toxic heavy metal density | concentration of the baked goods obtained by processing with the processing method of this invention has fallen to below soil environmental standard.
Moreover, the dioxin analysis result of the above-mentioned raw ash (before treatment) and the calcined ash (baked product) after detoxification treatment by the plant 1 is shown in FIGS. 7 and 8, respectively. It can be seen that the concentration of dioxins in the baked product obtained by detoxification at 4 is greatly reduced.
For example, when compared with the total dioxin concentration, what was 0.062 toxic equivalent (ng-TEQ / g) is reduced to 0.003 toxic equivalent (ng-TEQ / g).

As a result of the test evaluation in the plant 2, FIGS. 9 to 12 show that the heavy metal concentration is significantly reduced by the firing treatment from the heavy metal detoxification test results shown in FIG.
Similarly, in the dioxin concentration, after treatment (FIG. 11) compared to before treatment (FIG. 10), for example, compared with the total dioxin concentration, there was 4.0 toxic equivalent (ng-TEQ / g). Has been reduced to 0.0014 toxic equivalent (ng-TEQ / g).
In addition, the density | concentration is low so that the dioxin density | concentration analysis result of the waste gas generated from the plant 2 may be shown in FIG.

The incineration method concerning this invention and the detoxification flow figure of the pollutant using incineration waste gas are shown. A flow diagram of the incinerator is shown. The flow of an exhaust gas treatment device (back filter) part is shown. The flowchart of a baking furnace (rotary kiln) part is shown. The flowchart of the example which made the exhaust gas processing apparatus of the incinerator and the baking furnace into one system is shown. The harmful | toxic heavy metal detoxification test result in the plant 1 shown in FIG. 5 is shown. The dioxin density | concentration measurement result before the process in the plant 1 is shown. The dioxin density | concentration measurement result after detoxifying in the plant 1 is shown. The harmful | toxic heavy metal detoxification test result in the plant 2 shown in FIG. 1 is shown. The dioxin density | concentration measurement result before the process in the plant 2 is shown. The dioxin density | concentration measurement result after detoxifying in the plant 2 is shown. The dioxin density | concentration measurement result in the waste gas from the plant 2 is shown.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Incinerator 2 Secondary combustion chamber 3 Stirring pusher 4 Ash discharge pusher 5 Water cooling wall 6 Ignition burner 7 Stirring fan 8 Combustion fan 9 Secondary combustion burner 10 Solid material input device 11 Pusher drive hydraulic unit 12 Waste crane 13a Platform 13b Disposal Waste pit 14 Cooling water tank 15 Air / water separator 16 A heavy oil tank 17 Waste oil tank 18 Waste acid / waste alkali tank 19 Ashing scraper 20 Ash storage 21, 121 Precooler 22, 122 Heat exchanger 23, 123 For heat exchanger Fans 24, 124 Emergency exhaust tamper devices 25, 125 Precooler spray compressor 26 Exhaust blower 27 Rotary kiln type firing furnace 28 Kiln drive motor 29 Kiln secondary combustion burner 30 Kiln combustion burner 31 Rotary cooler 32 Kiln ash scraper 33 Input pusher 34 Input hydraulic unit 35 for pusher protection Cooling water tank 36, 136 Rapid temperature reducer 37, 137 Temperature reducing pump 38, 138 Temperature reducing water tank 39, 139 Temperature reducing compressor 40, 140 Temperature reducing ash Output scraper 41, 141 Reduced temperature fly ash storage facility 42, 142 Bag filter 43, 143 Pulse compressor 44, 144 Rotary valve 45, 145 Paddle mixer 46, 146 Chelating agent tank 47, 147 Dust storage facility 48, 148 Activated carbon spraying device 49, 149 Slaked lime spraying device 50, 150 Induction fan 51 Instrumentation compressor 52, 152 Exhaust gas attraction control device 53 Carbon monoxide concentration / oxygen concentration continuous analyzer 54 Chimney 55 Crusher 56 Trommel 57 Raw ash pit 58 Receiving hopper -59a, 59b, 59c, 59e Belt conveyor 60 Magnetic separator 61 Vibrating sieve 62 Metal scrap storage facility 63 Particle size under 10 mm product storage 64 Particle size over 10 mm product storage

Claims (6)

  A waste and pollutant volume reduction / detoxification method characterized by comprising an incinerator and a firing furnace in the same site, and using exhaust gas generated from the incinerator as a firing gas for the firing furnace.   2. The waste and pollutant volume reduction / detoxification treatment according to claim 1, wherein the pollutant is a complex pollutant containing organic chlorine compounds such as dioxins or PCBs and harmful heavy metals. Method.   Combined pollutants include either incinerated ash or incinerated fly ash, contaminated soil, or excavated landfill waste that contains dioxins or organic chlorinated compounds such as PCBs and harmful heavy metals. The waste and pollutant volume-reducing / detoxifying method according to claim 2, which is contained alone or in combination.   The volume reduction and harmlessness of waste and pollutant according to any one of claims 1 to 3, wherein the volume reduction processing of waste is performed in an incinerator and the pollutant decontamination process is simultaneously performed in a firing furnace. Processing method.   The wood scrap fuel and / or RPF fuel (Refuse Peper and Plastic Fuel) or both are mixed with a pollutant to reduce heavy metals during firing and to reduce the fired fuel. Volume reduction / detoxification processing method of waste and pollutant as described in any one.   Waste and pollutant volume reduction / detoxification treatment equipment characterized in that an incinerator and a firing furnace are provided on the same site, and exhaust gas generated from the incinerator is used as a firing gas for the firing furnace.

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