JP3241754B2 - Leachate treatment equipment at the final waste disposal site - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a leachate treatment facility at a final waste disposal site.

[0002]

2. Description of the Related Art Generally, waste such as incinerated ash and incombustible waste is
Finally, a final landfill for waste will be set up and reclaimed in a depression that has been cut in a valley. The above-mentioned final waste disposal site is set up in a state of being exposed to the open air, and its bottom surface is made of rubber, vinyl sheet, etc. to prevent the leachate from the above-mentioned waste from seeping underground. The seat is stretched.

[0003] However, when rain falls on the above-mentioned waste final disposal site, the rainwater passes through the waste, so that the biochemical oxygen demand (BOD),
Sewage with a high value of Chemical Oxigen Demand (COD) will be accompanied by toxic substances such as heavy metals. When this leachate flows into a river, it is no longer possible to comply with the river discharge water quality standard stipulated in the Water Pollution Control Law, so it is necessary to perform advanced water purification treatment and discharge the river. In addition, if there is a source of drinking water or agricultural water near the location where the final waste disposal site is established, or if a fishing right is established, compensation for incompletely treated leachate will cause problems such as compensation problems. Responsibility issues arise.

[0004] Therefore, in the conventional waste final disposal site, a water purification facility for purifying advanced leachate by providing a majority of the total construction cost has been provided.

[0005]

The above-mentioned water purification equipment requires a large amount of installation area because it is necessary to carry out precipitation and filtration treatments separately for several orders.
The running cost and maintenance fee for operation management of complicated water purification treatment were also considerably high. The present invention has been made in view of the above-described problems, and has as its object to provide an inexpensive leachate treatment facility that does not require a water purification facility, and has a final disposal of a closed system that does not discharge leachate out of the system. Place will be realized.

[0006] In order to solve the above problems, leachate treatment equipment of the present invention, dry and leachate storage tank, waste tires, waste plastic, such as for storing the sewage leaching from the final waste disposal sites
And then stored in a leachate storage tank by a leachate spraying means by a leachate spraying means and a leachate spraying means for extracting the lignite gas with a calorific value of 9000 kcal / m ³ or more . An incinerator is provided, which sprays leachate and evaporates and emits the leachate with the high-temperature combustion flame to decompose and incinerate harmful substances contained in the leachate.

[0007]

According to the leachate treatment equipment having the above structure, the leachate stored in the leachate storage tank is pumped up by a pump and sprayed from a spray nozzle onto a flame of a burner to evaporate the leachate and to be contained in the leachate. It can incinerate harmful substances and odor components. Further, according to the leachate treatment equipment of the present invention, the equipment can be simplified and the installation area, equipment cost, and maintenance cost can be significantly reduced as compared with the conventional method.

In particular, the above-mentioned incinerator uses a flammable carbonization gas generated by carbonization treatment of polymer waste such as waste tires and waste plastics dumped at a final waste disposal site as a heat source. The elimination of fuel costs is also a major advantage.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. FIG. 1 is a schematic diagram of a leachate treatment facility in one embodiment of the present invention. Referring to FIG. 1, leachate treatment means F1, which is a main part of leachate treatment equipment, is installed adjacent to leachate storage tank 10, and near the leachate treatment means F1, a carbonization gasifier is provided. F2 is set up.

On the bottom of the final waste disposal site 1, a water-impervious sheet 2 made of rubber, vinyl sheet, or the like is stretched, and on the water-impervious sheet 2, waste such as incinerated ash and incombustible garbage is removed. The landfill layer 3 is formed. A part of the waste final disposal site 1 is partitioned by a dam 4.
A flow path 5 of leachate from the final waste disposal site 1 is formed in the bank 4, and the flow path 5 is connected to a leachate storage tank 10 from a pipe 6.
Is connected to the leachate treatment means F1.

The leachate treatment means F1 comprises: a leachate storage tank 10 for storing leachate introduced from the pipe 6;
A pump 11 for pumping leachate from a leachate storage tank 10;
A plurality of spray nozzles 12 and 13 for ejecting leachate pumped up by the pump 11 are provided. The leachate storage tank 10 has a volume sufficient to store leachate generated from the final waste disposal site 1 in one day. For example, when the final waste disposal site 1 is 10,000 m ² , 40 m ^3.
It is set to に 70 m ³ . The pump 11 pumps leachate from the leachate storage tank 10 via the pipe P1,
It is configured to supply leachate to the spray nozzle 12 via the pipes P2 and P3. Pressure regulating valves 14 and 15 for adjusting the amount of leachate supplied to the spray nozzles 12 and 13 are connected to the pipes P2 and P3, respectively. And these pump 11, spray nozzle 12, 1
3, the pressure regulating valves 14 and 15, and the pipes P1 to P3 constitute a main part of the leachate spraying means.

The dry distillation gasification apparatus F2 is a vertical dry distillation can 21 for dry distillation of high polymer waste such as waste tire T.
Then, while collecting the carbonized gas generated in the carbonized can 21 to the outside of the carbonized can 21 and supplying air to the carbonized gas combustion means 22 for incinerating the carbonized gas, the carbonized can 21 and the carbonized gas combustion means 22, respectively. And an air supply means 23 for performing the operation.

The dry distillation can 21 has a double structure of a water-cooled jacket type, and has an inlet 21a for polymer waste such as waste tires T and a cover 2 for closing the inlet 21a.
1b. And, on the side of the carbonization can 21,
A pipe P5 for leading the carbonized gas generated inside to the carbonized gas combustion means 22 is connected. The carbonized gas combustion means 22 is provided in a combustion furnace 22a for burning the collected carbonized gas inside, and the collected carbonized gas is supplied to the pipe P
5 and supplied to the burner 22b of the combustion furnace 22a and burned. Here, in the present embodiment, the combustion furnace 2
The spray nozzles 12 and 13 of the leaching water treatment means F1 are connected above the burner 22b on the side of 2a,
Each of the spray nozzles 12 and 13 sprays leachate into a high-temperature atmosphere caused by the flame of the burner 22b.

The air supply means 23 is provided in the dry distillation can 21.
A primary blower 23a for supplying air required for carbonizing the waste tire T therein, and a secondary blower 23b for supplying air for mixing with the carbonized gas to the burner 22b of the carbonized gas combustion means 22 are provided. Each blower 23
a, 23b are connected to air volume adjustment dampers d1, d2 for adjusting the amount of supplied air, respectively. Each of the air volume adjustment dampers d1 and d2 is of an electric type driven by a control motor (not shown).

Next, the process of leachate treatment of the present facility will be described. First, in the leachate treatment means F1, the rainwater passes through incinerated ash or non-combustible garbage in which rainwater accumulates. O. D.
And C. O. It becomes sewage with a high value of D and accompanies harmful substances such as heavy metals. This leachate is formed in a channel 5 formed in the dam 4.
And flows into the leachate storage tank 10 via the pipe 6 and is stored. On the other hand, in the dry distillation gasifier F2, the dry distillation can 2
The lid 11 is opened, and the waste tire T is introduced from the introduction port 21a, and the inside of the dry distillation can 21 is filled with the waste tire T.
Then, the primary blower 23a of the air supply means 23 is operated by the air amount adjusting damper d1 at an amount limited to the amount of air necessary for carbonizing the waste tire T to supply air into the carbonized can 21.

Next, the waste tire T is ignited from an ash outlet (not shown), and after confirming the ignition, the ash outlet is closed. Thereby, a combustion zone is formed on the bottom surface in the carbonization can 21. In this combustion zone, since the amount of air is limited as described above, the combustion reaction does not proceed, and the generated heat gives a general formula Cm Hm (where m represents a positive number of 2 or more). A gas is generated that contains a flammable substance such as a hydrocarbon compound or carbon monoxide and a small amount of free carbon.

It is desirable that the carbonization can 21 be cooled to less than 500 ° C. with water in consideration of the ignition temperatures of the various compounds. The waste tire T heated in the combustion zone gradually decreases in volume while discharging the gas, and until the waste tire T in the carbonization can 21 is completely supplied to the combustion zone, the heating and carbonization reaction in the combustion zone, The generation of the carbonized gas accompanying this is maintained. The duration of carbonization gas generation varies depending on the amount of waste tire T charged into the furnace.
It lasts for about 6 to 10 hours, during which the gas is continuously generated.

The gas generated by the dry distillation rises in the dry distillation can 21 without igniting because there is no residual air, and thermally decomposes the waste tire T above the combustion zone to further generate flammable substances and the like. Is sent to the burner 22b through the pipe P5. In this process, the carbonization gas is gradually decomposed by the water in the water jacket of the carbonization can 21 and the waste tire T, and is recovered outside the carbonization can 21 while lowering the temperature.
It is burned in the combustion furnace 22a of the carbonization gas burning means 22. The gas has a high calorific value of about 9000 kcal / m ³ or more, has sufficient self-combustibility, and has no danger of generating harmful substances causing air pollution when burned. Clean carbonized gas. For this reason, it can be burned as it is in the combustion furnace 22a as the dry distillation gas burning means.

When the burning of the dry distillation gas starts, the leachate stored in the leachate storage tank 10 is pumped up by the pump 11 and sprayed into the combustion furnace 22a by the spray nozzles 12 and 13 while adjusting the pressure by the pressure regulating valves 14 and 15. . As a result, the leachate sprayed from the spray nozzles 12 and 13 evaporates due to the high-temperature combustion flame of the carbonization gas, and harmful substances and odors contained in the leachate are completely burned.

Here, for example, the area of the final waste disposal site 1 is 10000 m ² , the average daily storage amount of leachate stored in the leachate storage tank 10 is 40 m ³ , and the operation time of the combustion furnace 22a is 6 hours. Then, since the processing amount of leachate per hour is 40/6 ≒ 6.7 m ³ / H, the required heat quantity Q
Q = G × 0.24 × 250 ° C. + 6700 × (593 + 0.46 × 250) = 60G + 474 × 10 ⁴ Kcal / H = 572 × 10 ⁴ Kcal / H For example, about 850 waste tires T per day By burning, the leachate for one day stored in the leachate storage tank 10 can be treated.

When all of the waste tires T in the carbonization can 21 are carbonized and no carbonized gas is generated, the air flow adjusting damper d1 is adjusted to supply sufficient air into the carbonized can 21 to remove the carbonized gas. The residue of the waste tire T after all has been discharged is ignited and burned to form completely harmless combustion ash, which remains at the bottom. The bonfire combustion usually ends in about one hour. Thereafter, the ash outlet is opened, and the process is completed by removing the combustion ash.

As described above, according to the present embodiment, the leachate stored in the leachate storage tank 10 is pumped up by the pump 11 and sprayed from the spray nozzles 12 and 13 onto the flame of the burner 22b to evaporate the leachate. As a result, harmful substances and odor components contained in the leachate can be incinerated. Moreover, in this embodiment, the leachate is incinerated in the combustion furnace 22a constituting the carbonization gas combustion means 22 of the carbonization gasifier F2, so that the fuel consumption is unnecessary, the equipment is simplified, and the equipment and maintenance costs are greatly reduced. can do.

The above-described embodiment is merely a preferred embodiment of the present invention.
A roof is provided to prevent leachate from increasing,
Various designs may be used within the scope that does not change the gist of the present invention, for example, the same function as that of the embodiment may be used instead of the individual components such as the spray nozzles 12 and 13 and other conventionally known means may be adopted. It goes without saying that changes can be made.

[0024]

The present invention is configured as described above, and sprays and evaporates leachate that has been discharged after being subjected to a conventional purification treatment, and also removes harmful substances and odors contained in the leachate. Is burned, the equipment required for the leachate treatment can be simplified, and equipment costs, running costs, and the like can be significantly reduced.

Moreover, by incinerating the leachate sprayed in the combustion furnace of the carbonization gas combustion means, high-energy carbonization gas, which is comparable to petroleum and gas fuels, can be produced from waste that has been conventionally treated as a troublesome person. As a result of being able to treat the leachate spray by utilizing the combustion flame of the recovered and distilled carbonized gas, there is also an advantage that it can contribute to the effective reuse of limited earth resources.

Therefore, according to the present invention, an inexpensive leachate treatment facility that does not require a water purification facility can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing one embodiment of the present invention.

[Explanation of symbols]

 F1 Leachate treatment means F2 Dry distillation gasifier 1 Final waste disposal site 10 Leachate storage tank 11 Pump (Component of leachate spraying means) 12 Spray nozzle (Component of leachate spraying means) 13 Spray nozzle (Leachate spray) Components of Means) 22 Carbonization Gas Combustion Means 22a Incinerator

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ Identification symbol FI F23G 5/027 F23G 5/027 A (56) References JP-A-50-61883 (JP, A) JP-A-56-162317 ( JP, A) JP-A-2-203108 (JP, A) JP-A-53-58171 (JP, A) JP-A-60-76744 (JP, U) JP-A-60-12037 (JP, U) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) F23G ^7/ 00-7/06

Claims (1)

(57) [Claims] 1. A leachate storage tank for storing sewage leached from a final waste disposal site , and a 9000kc
a leachating furnace for taking out as a carbonization gas having a calorie of at least al / m ³ , a leachate stored in a leachate storage tank is sprayed by a leachate spraying means onto a combustion flame burning the carbonization gas, and By evaporating and diverging by the combustion flame of
An incinerator for decomposing and incinerating harmful substances contained in leachate. A leachate treatment facility for a final disposal site for waste, comprising: