JP2001340894A - Advanced treatment method for leachate at landfill - Google Patents

Abstract

(57) [Summary] [Problem] The cost of operation is low and economical,
In addition, landfill that can completely decompose raw water containing biorefractory organic pollutants such as dioxin into harmless carbon dioxide, water and nitrogen, and easily obtain treated water with a COD value of 10 mg / l or less To provide an advanced treatment method for field leachate. SOLUTION: In an advanced treatment method performed after at least biological treatment with activated sludge on leachate of a landfill containing an organic pollutant that is hardly biodegradable, after treating with hydrogen peroxide and ozone together, An advanced treatment method for leachate at a landfill, wherein the treated liquid is passed through a filter bed made of biological activated carbon for treatment, and then the obtained treated liquid is subjected to activated carbon adsorption treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to an advanced treatment method for leachate of a landfill containing an organic pollutant which is hardly degradable.

[0002]

2. Description of the Related Art In recent years, landfill sites have been used as final disposal sites for industrial waste and general waste.
Incineration residue from incineration of combustible waste. The incineration residue (incineration ash) varies depending on the incineration temperature, but harmful organic chlorine compounds such as dioxin are generated by incineration,
This may be included in the incineration ash. Furthermore, since non-combustible garbage and sludge that can be landfilled contain a wide variety of components due to the diversification of materials in recent years, leachate from landfills contains various types of dioxins and other dioxins. Contains a biodegradable organic pollutant. As described above, in recent years, the leachate of a landfill disposal site has changed in water quality from the conventional leachate, and with the change in leachate water quality, the conventional leachate treatment method has become unable to cope. On the other hand, environmental pollution and the effect on human bodies brought about by biodegradable organic pollutants such as dioxins are serious, and complete treatment is desired. Therefore, in order to prevent these problems from occurring,
There is a need for the development of a complete and economical treatment method for landfill leachate.

[0003] Usually, leachate from a landfill is subjected to physical, chemical and biological treatments to remove organic substances, SS, heavy metals and the like in the leachate up to the quality of discharged water.
For example, in landfills mainly composed of combustible waste, biological treatment such as the activated sludge method is mainly used, and organic substances that are easily biodegradable are treated, and then advanced by physicochemical methods such as the membrane treatment method and activated carbon adsorption method. Treatment to remove non-biodegradable contaminants. However, with these physicochemical methods,
There is a problem that it is costly to generate secondary waste such as concentrated wastewater and contaminated adsorbents, and to completely remove biorefractory organic pollutants such as dioxins.

On the other hand, as an advanced treatment of wastewater, an oxidation method using ozone has been studied in various ways (water treatment technology, Vol. 33, No. 6, 1992, pp. 273-2).
88). The main purposes of using ozone are to oxidize and stabilize organic substances, detoxify toxic and harmful substances, and suppress the production of organic chlorine compounds. Although ozone has a very strong oxidizing power, it has a selective oxidizing effect on organic compounds, and acts on double or triple bonds or benzene rings in organic compounds to saturate or open rings. It is difficult to completely oxidize these organic compounds to carbon dioxide and water, and it is known that low-molecular organic compounds with high polarity such as aldehydes, ketones, and carboxylic acids remain after ozone treatment. I have.

When using ozone, it is necessary to provide an ozone generator, and there is another problem that the construction cost and running cost for operation are high. On the other hand, the applicant uses hydrogen peroxide as an oxidizing agent without using ozone, and in the presence of a metal catalyst,
There has been proposed an advanced treatment method for wastewater which oxidatively decomposes a biodegradable organic pollutant component into carbon dioxide, water, and nitrogen by treating it under acidic conditions (Japanese Patent Publication No. 59-1118, Japanese Patent Publication No. Hei 5-5). -85240). If this method is applied to advanced treatment methods for leachate at landfills,
The hardly decomposable substance can be completely decomposed, and the cost for the initial equipment can be significantly reduced because no special device such as an ozone generator is used.

[0006]

However, in the above method, since the treatment is carried out under acidic conditions, it is necessary to adjust the pH after the treatment. Further, since a metal catalyst is used, sludge is generated. Another problem arises that must be dealt with.

On the other hand, in recent years, various accelerated oxidation treatment methods that do not generate secondary waste and are capable of efficiently decomposing biologically difficult-to-decompose organic pollutants have attracted attention (industry). And Environment, 1999. 9, p. 86-91). According to this method, the generation of OH radicals having a very strong oxidizing power causes pollutants in the water to contain carbonate ions,
It is completely oxidatively decomposed to water and nitrogen. Ozone / hydrogen peroxide, ozone / ultraviolet rays, hydrogen peroxide / ultraviolet rays, ozone / hydrogen peroxide /
Ultraviolet rays and the like are known. Each of these forms water or oxygen after treatment, and thus has the advantage of not generating secondary waste. Furthermore, when ozone is used in combination, decoloring, deodorizing and sterilizing effects are also obtained.

However, in order to completely perform advanced treatment of wastewater by the above-mentioned accelerated oxidation treatment method, there is another problem that not only costs for initial equipment but also large running costs and economical inefficiency are required. is there. The problem of economics is very important because it requires continuous treatment and the treatment cost for landfill leachate resulting from waste.

Accordingly, an object of the present invention is to reduce the cost of operation and to be economical, and to convert treated water containing a biodegradable organic pollutant such as dioxin into harmless carbon dioxide gas, water and nitrogen. Up to CO2
It is an object of the present invention to provide an advanced treatment method for leachate at a landfill disposal site from which treated water having a D value of 10 mg / l or less can be obtained.

[0010]

The above objects are achieved by the present invention described below. That is, the present invention relates to an advanced treatment method performed after at least biological treatment with activated sludge on landfill leachate containing a biodegradable organic pollutant component, after the treatment using a combination of hydrogen peroxide and ozone. Further, the method is an advanced treatment method for leachate at a landfill disposal site, wherein the treated liquid is passed through a filter bed made of biological activated carbon to be treated, and then the obtained treated liquid is subjected to activated carbon adsorption treatment. .

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail with reference to preferred embodiments of the present invention. The present inventors have conducted intensive research to solve the above-described problems of the prior art, and as a result, when treating landfill leachate containing a biodegradable organic pollutant component, after biological treatment with activated sludge, First, hydrogen peroxide and ozone are used together for treatment, and then the treated liquid is passed through a filter bed made of biologically activated carbon for treatment. Easily and almost completely oxidatively decompose organic harmful organic pollutants to harmless carbon dioxide, water and nitrogen. According to the above method, the running cost is significantly reduced. The inventors have found that the present invention can be achieved, and have reached the present invention.

As a result of the study by the present inventors, in any of the above-mentioned conventional advanced treatment methods, final treatment such as decolorization and deodorization by activated carbon adsorption treatment is performed. The efficiency of adsorption of activated carbon in the treatment is poor, the need for frequent replacement of activated carbon is required, and a large amount of contaminated secondary waste is generated. Was. Therefore, the present inventors believe that if the enormous cost involved in the activated carbon adsorption treatment can be reduced, it can greatly contribute to the reduction of the cost required for the entire advanced treatment, and the liquid introduced into the final activated carbon adsorption treatment is considered. As a result of conducting various studies on the properties of the activated carbon, the COD value of the liquid to be subjected to the activated carbon adsorption treatment can be suppressed to a low level, and the liquid is easily adsorbed by the activated carbon, and the treatment efficiency of the activated carbon adsorption treatment can be remarkably improved. The treatment method up to the activated carbon adsorption treatment was found.

That is, first, a treatment liquid obtained by subjecting leachate from a landfill disposal site containing a biodegradable organic pollutant to biological treatment with activated sludge is treated with a combination of hydrogen peroxide and ozone. If the treated liquid is passed through a filter bed made of biological activated carbon and then activated carbon adsorption treatment is performed, the COD value of the liquid to be subjected to activated carbon adsorption treatment can be reduced to 20 mg / l or less, and It was found that the amount of COD adsorbed per unit of activated carbon was 4 to 5 times as large as that in the conventional case, and the adsorption efficiency of activated carbon was significantly improved. Although the reason is not clear, when the biodegradable organic pollutant is treated in combination with hydrogen peroxide and ozone, it is decomposed by the strong oxidizing power of OH radicals generated in such treatment, and a part of it is completely decomposed. At the same time, others become low molecular weight, easily biodegradable organic matter. Next, if the liquid containing such an organic substance is passed through a filter bed made of biological activated carbon, the organic substance adsorbed on the activated carbon by the organic substance decomposing microorganisms growing on the surface of the activated carbon is easily decomposed.
As a result, the liquid after passing through the filter bed made of biologically activated carbon has a reduced COD value, and the remaining COD value
It is considered that the component represented by the value becomes a property that is remarkably easily adsorbed on the activated carbon. As a result, a remarkable effect is obtained in that the COD value of the final treatment liquid after the activated carbon adsorption treatment can be extremely easily reduced to 10 mg / l or less.
Hereinafter, each step of the advanced treatment method for leachate at a landfill disposal site of the present invention will be described.

[0014] The advanced treatment method for leachate of a landfill disposal site according to the present invention is intended for a treatment liquid obtained by subjecting leachate of a landfill disposal site containing a biorefractory organic pollutant to biological treatment with at least activated sludge. As such a treatment liquid (hereinafter referred to as raw water), for example, a COD value of 50 to 300 mg /
l, BOD value is 1-50 mg / l, total nitrogen amount is 1-60
The target is a substance containing a biodegradable organic pollutant having a mg / l and a chromaticity of about 30 to 300.

[0015] In the advanced treatment method for leachate of a landfill disposal site according to the present invention, such raw water is first treated using both hydrogen peroxide and ozone. As described above, OH radicals having extremely strong oxidizing power are generated by such a treatment, and oxidation is promoted. As for easily oxidizable components among the organic pollutants which are hardly decomposable, even carbon dioxide and water are completely eliminated. Decompose into Furthermore, even components that are difficult to completely oxidize are converted into low molecular weight biodegradable substances such as aldehydes, ketones, and carboxylic acids.

In the present invention, it is preferable to use ozone generated by an ozone generator and then made uniform. As the usage amount, ozone may be sent at a rate of about 1 to 60 mg / min per liter of raw water.
Further, at this time, hydrogen peroxide is added to the raw water and reacted while stirring. The concentration of hydrogen peroxide depends on the properties of the raw water, but is 0.03 to 0.22 ml as a 35% hydrogen peroxide solution (5% as oxygen atoms) per liter of raw water.
(About 40 mg / l). In the present invention, as will be described later, sufficient oxygen is required in the subsequent treatment with a filter bed made of biologically activated carbon. To this end, it is necessary to increase the amount of added hydrogen peroxide. preferable. That is, if a large amount is added so that hydrogen peroxide remains after the treatment, it becomes a necessary oxygen supply source when water is passed through a filter bed made of biological activated carbon. In this case, it is preferable that the amount remaining is 2 to 10 mg / l as oxygen. The present invention is not limited to this, and hydrogen peroxide may be newly added before water is passed through the filter bed made of biological activated carbon. The raw water described above is oxidized by the above-described combined treatment method of hydrogen peroxide and ozone, and COD
20-200 mg / l, BOD value 1-30 mg / l
1, total nitrogen amount is 1 to 60 mg / l, chromaticity is 10 to 100
It will be of the nature of the degree.

In the course of the investigation, the inventors of the present invention did not use ozone, but used hydrogen peroxide and an iron catalyst at a pH of 5 or less.
As shown in the above, advanced treatment was performed on raw water in the same manner as above. As a result, it can be confirmed that the COD value, the total nitrogen amount, and the chromaticity of the treated water can be reduced, and the biodegradable organic pollutant can be decomposed more efficiently than in the case of the above-described combined treatment of hydrogen peroxide and ozone. Was. However, since the treatment is carried out at a pH value of 5 or less, a neutralization treatment is required in order to proceed to the next treatment, and sludge due to the iron catalyst is generated. Required (see FIG. 2). Furthermore, when the activated carbon adsorption treatment is finally performed thereafter, the activated carbon adsorption efficiency for the component represented by the remaining COD value is low, and in order to make the final treated water COD value 10 mg / l or less, It turned out that the activated carbon had to be changed frequently. As a result, it was found that although the ozone generator was not required, the cost for the initial equipment could be reduced, but it could not be said to be the optimal method considering the total cost for advanced treatment.

Further, if it is intended to completely remove the biodegradable organic pollutants in the raw water by the combined use of hydrogen peroxide and ozone as described above, a long time treatment is required and a large amount of ozone is required. . Further, similarly to the above method, when the activated carbon adsorption treatment is performed thereafter, the remaining COD value is higher than that of the above method, and the activated carbon adsorption efficiency of the component represented by the COD value is the same as in the above case. In order to reduce the COD value of the final treated water to 10 mg / l or less, it is necessary to frequently change the activated carbon, which is not economical.

On the other hand, in the present invention, as shown in FIG. 1, after the above-described combined treatment of hydrogen peroxide and ozone is performed, the treated liquid is further passed through a filter bed made of biological activated carbon. It is characterized by passing water for treatment. According to this method, the COD value of the liquid after passing water can be reduced, and
Since the adsorbed component is decomposed by the microorganism on the surface of the biological activated carbon, it has been found that the activated carbon adsorption efficiency of the component represented by the COD value remaining after passing water is significantly improved. As a result, when the final activated carbon adsorption treatment is performed, it becomes easy to reduce the COD value of the treated water to 10 mg / l or less (see FIG. 1).

The biological activated carbon used in the present invention means that organic matter-degrading microorganisms such as activated sludge are propagated on the surface of activated carbon, and the organic pollutants adsorbed on the activated carbon are decomposed by the organic matter-degrading microorganism, and the activated carbon is decomposed. It regenerates and maintains the adsorption capacity. Although the mechanism of this biological activated carbon is unknown, it is known that organic matter degrading microorganisms propagated on the surface of activated carbon particles can also decompose biodegradable organic matter by a synergistic effect with activated carbon. In the present invention, when a filter bed of biological activated carbon is passed through,
It is not clear why the efficiency of the final activated carbon adsorption treatment can be increased, but the biodegradable organic pollutants are first decomposed by ozone and hydrogen peroxide to low-molecular organic substances, which are filtered through the bioactive carbon filter. When water is passed through, it is further biodegraded by organic matter degrading microorganisms on the surface of activated carbon,
As a result, it is considered that the material was easily physically adsorbed to the activated carbon.

In the biological activated carbon treatment, when a large amount of organic pollutants is contained, a film is formed in the filter bed by the organic pollutants adsorbed on the biological activated carbon forming the filter bed and the microorganisms propagating there. The filter bed may be clogged, or an anaerobic portion may be formed in the filter bed due to a decrease in dissolved oxygen in the wastewater due to the large propagation of microorganisms. Therefore, it is necessary to supply sufficient oxygen to the biological activated carbon filter bed. In the present invention, the biological treatment and the combined treatment of ozone and hydrogen peroxide are performed before the biological activated carbon treatment, so that the amount of the organic pollutants is reduced. If hydrogen peroxide remains in the liquid to be passed, the hydrogen peroxide becomes a source of oxygen for microorganisms on the surface of the bioactive carbon particles, so that it is not necessary to perform aeration. However, depending on the concentration of the remaining organic pollutants, or in order to complete the purification treatment, at least a part of the treatment liquid to be treated by passing water through a filter bed made of biological activated carbon is further aerated. After that, it is preferable that the aerated liquid is passed through a filter bed made of biological activated carbon for treatment. In addition, when the water is passed through a filter bed made of biologically activated carbon, a circulation treatment may be performed so that the treatment liquid passes through the filter bed a plurality of times (see FIG. 1).

[0022]

Next, the present invention will be described in more detail with reference to Examples and Comparative Examples. <Example 1> In Examples and Comparative Examples, leachate from landfill sites mainly composed of combustible garbage having the properties shown in Table 1 was subjected to ordinary activated sludge method and biological nitrification and denitrification method. Was used. Table 1 also shows the properties of the liquid after the biological treatment. Further, as a pretreatment for advanced treatment, ferric ion was added at 250 mg / l and a polymer flocculant 1
mg / l was added, and aggregation treatment was performed under the condition of pH 4.

[0023]

[Table 1]

FIG. 3 schematically shows the processing apparatus used in this embodiment. First, the treatment liquid after the coagulation treatment was introduced into an oxidation tank, and a combined treatment of hydrogen peroxide and ozone was performed under the following conditions. At this time, 0.1 liter per 1 liter of the liquid in the oxidation tank was used.
Hydrogen peroxide was added at a rate of 053 ml, and at the same time, the ozone generated by the ozone generator was made uniform and fed at a rate of 10 mg per minute per liter of liquid. The processing time was 15 minutes. Table 2 shows the properties of the treatment liquid after the pH was adjusted in the neutralization tank.

Next, the liquid subjected to the combined treatment of hydrogen peroxide and ozone as described above was passed through a filter bed made of biological activated carbon. As a result of examining the residual state of hydrogen peroxide in this liquid, it was confirmed that 5 mg / l of hydrogen peroxide remained as oxygen. In the case of this example, as shown in FIG. 3, after the combined use of hydrogen peroxide and ozone, the pH was adjusted and neutralized, and air was sent for aeration. As the filter bed made of biological activated carbon, a biological activated carbon column having a packed bed height of 7 cm, a diameter of 3 cm and a height of 40 cm was used, and water was passed at a rate of 4.5 ml / min. Table 2 shows the properties of the treated liquid after passing through the biological activated carbon filter bed.

Further, as a final treatment, the treated liquid after passing through the biological activated carbon filter bed obtained above was subjected to activated carbon adsorption treatment. At this time, an activated carbon column having a packed bed height of 7 cm, a diameter of 3 cm and a height of 40 cm was used, and water was passed at a rate of 4.5 ml / min. Table 2 shows the properties of the treatment liquid after the adsorption of the activated carbon. As a result, it was confirmed that the COD value of the treatment liquid after the activated carbon adsorption treatment was easily reduced to 10 mg / l or less, and it was confirmed that the biodegradable organic pollutant could be almost completely decomposed. In addition, when the amount of adsorption in the activated carbon adsorption treatment of the final treatment was determined, CO
It was 0.054 kg in terms of D, indicating a high adsorption efficiency. Furthermore, by calculating the running cost when the leachate of the landfill disposal site used in the present example was subjected to advanced treatment by the method of the present example, it was found that the treatment was extremely inexpensive at 62 yen / m ³ . .

[0027]

[Table 2]

In this embodiment, as the activated carbon to be subjected to the final treatment, an activated carbon sold under the trade name of commercially available granular activated carbon Tsurumi Coal GL-30 (coal) was used. However, the present invention is not limited to this, and any other commonly used activated carbon or other activated carbon for adsorption may be used. In this example, as the biological activated carbon, a biological activated carbon obtained by inoculating the above-mentioned activated carbon with a microorganism collected from activated sludge used when the leachate of the landfill disposal site was biologically treated was used. However, the present invention is not limited to this.Biological activated carbon is obtained by forming a filter bed with ordinary activated carbon and allowing microorganisms to propagate on the surface of activated carbon particles by passing leachate from a landfill containing microorganisms. May be used. When water is passed through such a biological activated carbon filter bed, when raw water passes through the filter bed, organic matter in the raw water is adsorbed on the activated carbon and is aerobically decomposed by microorganisms growing on the surface of the activated carbon particles. You. At this time, if the hydrogen peroxide used in the preceding step remains, the nascent oxygen is released by the catalytic action of the activated carbon, and the decomposition of the biodegradable organic matter also occurs. Furthermore, since it is also decomposed by microorganisms by the catalytic action of activated carbon, the COD value and BOD value of the liquid to be subjected to activated carbon adsorption, which is the final treatment, can be significantly reduced.

<Comparative Example 1> FIG. 4 schematically shows a processing apparatus used in this comparative example. The treatment liquid after the same aggregation treatment as in Example 1 was treated with hydrogen peroxide and an iron catalyst at a pH of 3.2. At this time, liquid 1
Hydrogen peroxide was added at a rate of 0.106 ml to 1 liter, and as a catalyst, 120 mg of ferrous ion was added to 1 liter of the liquid, and the mixture was reacted for 15 minutes for treatment. Next, the oxidized solution was neutralized. However, sludge caused by iron ions was generated during the neutralization, and the activated carbon adsorption treatment could not be performed as it was. Therefore, a polymer flocculant is added at a rate of 1 mg / l to grow a flocculation block, then solid-liquid separated in a precipitation tank, and the obtained supernatant is passed through a filtration column to remove sludge. Removed.
At this time, the treatment liquid was passed at a rate of 4.5 ml / min using a filtration column having a diameter of 3 cm and a height of 40 cm. Thereafter, the same activated carbon adsorption treatment as in Example 1 was performed. Table 3
The properties of each treatment solution before and after performing the final activated carbon adsorption treatment are shown below. As shown in Table 3, in the treatment of this comparative example, it was difficult to make the quality of the final treated water equal to that of Example 1.

[0030]

[Table 3]

Further, when the amount of adsorption in the final activated carbon adsorption treatment was determined, it was 0.012 kg in terms of COD per 1 kg of activated carbon. The amount of adsorption was smaller than that of Example 1, and the adsorption efficiency was significantly lower. Turned out to be inferior. Therefore, in order to make the COD value 10 mg / l, the activated carbon had to be replaced frequently.

According to the method of the present comparative example, the running cost required when the leachate at the landfill site was subjected to advanced treatment was calculated in the same manner as in Example 1, and the result was 578 yen / m ³ .
This means that the running cost is 9 times or more per m ^{3 as} compared with the case of the first embodiment. In the case of this comparative example, since ozone is not used, the cost for initial equipment such as an ozone generator can be suppressed,
The problem of running cost is large when treating a large amount of leachate from a landfill site on a daily basis, which proved to be a major obstacle to economic considerations.

<Comparative Example 2> FIG. 5 schematically shows a processing apparatus used in this comparative example. The same treatment as in Example 1 was performed, except that the same raw water as in Example 1 was not subjected to the treatment of passing water through a filter bed made of biological activated carbon. Table 4 shows the properties of each treatment solution before and after the final activated carbon adsorption treatment. As a result, as shown in Table 4, it was difficult to make the quality of the final treated water equal to that of Example 1.

[0034]

[Table 4]

When the amount of adsorption in the activated carbon adsorption treatment was determined, it was calculated to be 0.020 in terms of COD per kg of activated carbon.
kg, the amount of adsorption was smaller than that of Example 1, and the adsorption efficiency was remarkably inferior. Therefore, in order to make the COD value 10 mg / l, the activated carbon had to be replaced frequently. Furthermore, the running cost required when the leachate at the landfill disposal site was highly treated by the method of the present comparative example was calculated in the same manner as in the case of Example 1. As a result, the running cost was 201 yen / m ³ , which was higher than that of Comparative Example 1. Although the cost can be reduced, the running cost is about three times as large as that of the first embodiment, and when a large amount of leachate from a landfill is treated on a daily basis, the economic burden may increase. all right.

[0036]

As described above, according to the present invention, the cost of operation is low, the economy is excellent, and the treated water containing a biodegradable organic pollutant such as dioxin can be used.
Provided is an advanced treatment method for landfill leachate that can completely decompose into harmless carbon dioxide, water and nitrogen. Further, according to the present invention, the running cost of the activated carbon adsorption treatment can be remarkably reduced, so that the economical efficiency of the entire advanced treatment can be achieved, and the final treatment liquid after the activated carbon adsorption treatment can be easily and extremely easily prepared. A remarkable effect is obtained in that the COD value in a clean state can be reduced to 10 mg / l or less.

[Brief description of the drawings]

FIG. 1 is an example of a processing flow of an advanced treatment method for leachate at a landfill disposal site of the present invention.

FIG. 2 is an example of a processing flow of a conventional advanced treatment method for leachate from a landfill.

FIG. 3 is an advanced treatment method for leachate at a landfill disposal site performed in Example 1.

FIG. 4 is an advanced treatment method for leachate at a landfill disposal site performed in Comparative Example 1.

FIG. 5 is an advanced treatment method for leachate at a landfill disposal site performed in Comparative Example 2.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) C02F 9/00 502 C02F 9/00 502R 503 503C 1/28 1/28 D 1/78 ZAB 1/78 ZAB 3/10 3/10 A

Claims (5)

[Claims] Claims: 1. An advanced treatment method in which leachate from a landfill containing an organic pollutant that is hardly biodegradable is subjected to biological treatment with at least activated sludge, wherein hydrogen peroxide and ozone are used in combination. Further, an advanced treatment method for leachate from a landfill, wherein the treated liquid is passed through a filter bed made of biological activated carbon to be treated, and then the obtained treated liquid is subjected to activated carbon adsorption treatment. 2. Aeration of at least a part of a treatment liquid to be treated by passing water through a filter bed made of biological activated carbon, and thereafter,
The advanced treatment method for leachate from a landfill disposal site according to claim 1, comprising a step of treating the aerated liquid by passing it through a filter bed made of biological activated carbon. 3. A treatment liquid to be subjected to water treatment through a filter bed made of biologically activated carbon contains at least 2 hydrogen peroxide.
2. The composition according to claim 1, which is contained in an amount of from 10 to 10 mg / l (as oxygen).
Or the advanced treatment method for leachate at a landfill disposal site according to 2. 4. The leachate according to claim 1, wherein a COD value of the treatment liquid treated by passing water through a filter bed made of biological activated carbon is 20 mg / l or less. Advanced processing method. 5. The CO of the treatment liquid after the activated carbon adsorption treatment
The advanced treatment method for leachate at a landfill disposal site according to any one of claims 1 to 4, wherein the D value is 10 mg / l or less.