KR100959058B1 - Removing method of mixed malodor for organic sludge using alkaline material - Google Patents

Abstract

PURPOSE: A method for a complex foul smell of organic sewage using alkaline materials is provided to remarkably reduce the complex foul smell, and to drastically remove various complex smells of the organic sewage thorough a 2 stage process. CONSTITUTION: A method for a complex foul smell of organic sewage using alkaline materials comprises the following steps: discharging a basic foul smell by reacting calcium oxide or calcium hydroxide of 0.5 ~ 10 parts by weight with the organic sewage 100 parts by weight in 10°C ~ 30°C for 7 ~ 12 hours; fixing an acidic foul smell on the organic sewage with insoluble salt; drying the organic sewage in 300°C ~ 900°C for 15 ~ 45 minutes to remove a water-soluble foul smell(S20). A neutralizing agent is a sulfuric acid solution.

Description

REMOVING METHOD OF MIXED MALODOR FOR ORGANIC SLUDGE USING ALKALINE MATERIAL}

The present invention relates to a method for removing complex odor of organic sludge using an alkaline substance, and more particularly, by reacting an alkaline substance such as calcium oxide (CaO) or calcium hydroxide (Ca (OH) ₂ ) with organic sludge under optimum conditions. In the various processes of organic sludge such as paper and paper sludge, complex odor can be removed drastically, and all wastes generated can be recycled, which is environmentally friendly and economical. It is about.

Odor is a kind of air pollution. Hydrogen sulfide, mercaptans, amines and other irritating gaseous substances are defined as odors and disgusts that stimulate human smell. There are about 1,000 kinds of odor pollutants that cause odor as sensory pollutants that cause psychological and mental damage. The main types are classified as perishable odor, ammonia smell, sweat smell, and strong stimulating smell.

In particular, conventional methods of treating complex odor generated in organic sludge such as paper sludge include washing, adsorption, ozone, biodeodorization, combustion, and concealment (deodorant spraying). However, the complex odor generated from organic sludge such as paper sludge is not one kind of odor, but contains a large amount of water.

The conventional treatment method for each malodor is as follows.

First, methyl mercaptan (CH ₃ SH), which causes onion and cabbage rotting odors, may be applied to adsorption, chemical cleaning (using basic chemicals), ozone oxidation, and concealment. As a method of attaching and removing malodor particles in many pores of water, the use of organic sludge, such as papermaking sludge, which has a high moisture content, is not possible because the water closes pores.

In addition, even when the ozone oxidation method is used, waste water treatment facilities, waste ozone treatment facilities, ozone generators are expensive, and they cannot be used for high concentrations of odors. Therefore, they are not suitable for removing odors of organic sludge such as paper sludge. .

The concealment method (deodorant spray method) can be applied to a relatively low concentration of odor, but the deodorant cost is too high to be suitable for the removal of complex odors of organic sludge, such as high-density paper sludge. And there is a disadvantage that needs to adjust the concentration of the neutralizing agent.

Methyl sulfide [(CH ₃ ) ₂ S] should be treated by adsorption, combustion, or ozone oxidation. For the removal of odor of organic sludge such as paper sludge with a lot of water vapor, the same reasons as for the treatment of methyl mercaptan (CH ₃ SH) It is difficult to use the adsorption method, and the combustion method requires a fuel cost, harmful exhaust gas treatment, and expensive catalysts.

In addition, ozone oxidation has problems such as waste water treatment facility installation, waste ozone treatment facility installation, ozone generator is expensive and unusable for high concentration odor. Methyl disulfide (CH ₃ SSCH ₃ ) is insoluble and neutral odor that is insoluble in water. Ozone oxidation should be used, but there are problems in installing waste water treatment facilities and waste ozone treatment facilities, using expensive ozone generators, and high concentrations of odor.

Hydrogen sulfide (H ₂ S) with rotten egg smell can be applied by adsorption method, ozone oxidation method, and chemical liquid cleaning method. In order to remove odor of organic sludge such as papermaking sludge which is moist, it is impossible to use it because water closes pores.In case of using ozone oxidation method, waste water treatment facility and waste ozone treatment facility are installed and expensive. The use of ozone generators and high levels of odor are problematic.

In addition, ammonia (NH ₄ OHNH ₄ OH) causing irritating odor, trimethylamine ((CH ₃ ) ₃ N) causing manure odor, methylamine (CH ₃ NH ₂ ), ethylamine causing fish rotting odor ( CH ₃ CH ₂ NH ₂ ) is well soluble in water, so it can be treated by washing method, chemical liquid washing method (acidic chemicals), but it is difficult to treat wastewater containing high concentration of nitrogen when using washing method. Induces propionic acid (CH ₃ CH ₂ COOH), sweat-like normal butyric acid [CH ₃ (CH ₂ ) COOH], wet oral odor-induced normal valeric acid [CH ₃ (CH ₂ ) ₃ COOH], Isovaleric acid [(CH ₃ ) ₂ CHCH ₂ COOH] can be removed using water-soluble properties, but there is a problem in wastewater treatment.

The present invention is to solve the above problems, an object of the present invention, the purpose of the innovative removal of a variety of complex odors for organic sludge such as paper sludge through a two-step process.

In addition, it is optimized for the process of manufacturing slag forming tablets using organic sludge such as paper sludge, which significantly reduces complex odor without affecting steelmaking products, and recycles all wastes generated without wastewater discharged. Its purpose is to provide an environmentally friendly method for removing complex odors.

In addition, the fuel cost of the drying process is reduced due to the reduction of moisture due to the hydration reaction and the heat of reaction, and the storage period of organic sludge such as paper sludge can be extended more than 2.5 times due to the sterilization effect, and the slag forming agent is installed in the manufacturing process. It also aims to prevent failures.

In addition, it is possible to completely remove the complex odor containing a large amount of water vapor, it is possible to remove the odor by a simple additional process is to provide a compound odor removal method with excellent economic efficiency.

In addition, in the process of manufacturing the slag forming tablet using organic sludge such as paper sludge, unlike the conventional odor removal process at the outlet of the downstream end of the production process, by removing the odor by pre-treatment of the raw material through the chemical reaction at the front of the production process It aims at blocking the odor in a manufacturing process fundamentally.

Composite odor removal method of organic sludge using an alkali material according to the present invention for achieving the above object, in the composite odor removal method of organic sludge using an alkaline material, 100 parts by weight of the calcium sludge (CaO) ) Or calcium hydroxide (Ca (OH) ₂ ) by adding 0.5 to 10 parts by weight of the reaction at a temperature of 10 ℃ to 30 ℃ for 7 to 12 hours to discharge the basic odor, acid odor is an insoluble salt of the organic Reaction step of fixing to the sludge; characterized in that comprises a.

Further comprising the drying step of drying the organic sludge after the reaction step at a temperature of 300 ℃ to 900 ℃ for 15 to 45 minutes; In the drying step, water-soluble odor is dissolved and removed by the water vapor generated during drying It is done.

In the reaction step, the discharged basic odor is removed by a chemical solution washing method using a neutralizing agent, the neutralizing agent is characterized in that the sulfuric acid solution, the organic sludge is papermaking sludge, the water content is characterized in that 50% to 90%. It is done.

Further, in the reaction step, at least one of sodium carbonate (Na ₂ CO ₃ ) or sodium hydroxide (NaOH) is added to 2 parts by weight to 10 parts by weight based on 100 parts by weight of the organic sludge, the oxidation The grain size of calcium (CaO) and calcium hydroxide (Ca (OH) ₂ ) is characterized in that 0.1mm to 1mm.

In the reaction step, the calcium oxide (CaO) and the calcium hydroxide (Ca (OH) ₂ ) is removed from the organic sludge due to the hydration reaction and the heat of reaction of 40 ℃ to 80 ℃, the moisture is removed the calcium oxide (CaO) and the calcium hydroxide (Ca (OH) ₂ ) is characterized in that 250 to 400kg per ton, the hydrogen ion concentration (pH) of the organic sludge after the reaction step is characterized in that 8 to 10.

According to the method for removing the complex odor of the organic sludge using the alkali material of the present invention, the present invention is to solve the above problems, it is possible to drastically remove various complex odors for organic sludge such as paper sludge through a two-step process. There is an advantage.

In addition, it is optimized for the process of manufacturing slag forming tablets using organic sludge such as paper sludge, which significantly reduces complex odor without affecting steelmaking products, and recycles all wastes generated without wastewater discharged. In addition to eliminating odors, there is an advantage of being environmentally friendly.

In addition, the fuel cost of the drying process is reduced due to the reduction of moisture due to the hydration reaction and the heat of reaction, and the storage period of organic sludge such as paper sludge can be extended more than 2.5 times due to the sterilization effect, and the slag forming agent is installed in the manufacturing process. Failures also have the advantage of being prevented.

In addition, it is possible to completely remove the complex odor containing a large amount of water vapor, it is possible to remove the odor by a simple additional process has the advantage of excellent economic efficiency.

In addition, in the process of manufacturing the slag forming tablet using organic sludge such as paper sludge, unlike the conventional odor removal process at the outlet of the downstream end of the production process, by removing the odor by pre-treatment of the raw material through the chemical reaction at the front of the production process , There is an advantage that can block the odor in the manufacturing process at the source.

1 is a flow chart sequentially showing a method for removing odor of organic sludge using an alkaline material according to the present invention

Hereinafter, with reference to the accompanying drawings, a preferred embodiment of the present invention with respect to a method for removing organic odor complex organic sludge using an alkali material according to the present invention. The invention can be better understood by the following examples, which are intended for the purpose of illustration of the invention and are not intended to limit the scope of protection defined by the appended claims.

As shown in Figure 1, the complex odor removal method of the organic sludge using the alkaline material according to the present invention, comprises a reaction step (S10), drying step (S20).

First, the reaction step (S10) is added to 0.5 to 10 parts by weight of at least one of calcium oxide (CaO) or calcium hydroxide (Ca (OH) ₂ ) to 100 parts by weight of organic sludge, 7 to 12 at a temperature of 10 ℃ to 30 ℃ After reacting for a time, the basic odor is discharged, and the acid odor is fixed to the organic sludge as an insoluble salt.

Here, the organic sludge includes all organic wastes such as paper sludge, sewage sludge, manure sludge, food waste, sludge in the food processing process. However, the results of several experiments, the most suitable for the odor removal process of the present invention is the paper sludge, the water content of the paper sludge is preferably 50% to 90%, more preferably 70% to 80% is most effective. to be. If the moisture content is less than 50%, the odor is already released into the atmosphere. If the water content exceeds 90%, the fuel consumption is high during drying. If there is a large amount of hydrogen bubbles are generated in the steelmaking product there is a problem that the quality of the steelmaking product.

In addition, calcium oxide (CaO) and calcium hydroxide (Ca (OH) ₂ ) may be added or mixed, respectively, and the content thereof is preferably 0.5 to 10 parts by weight based on 100 parts by weight of the organic sludge. More preferably 1 to 5 parts by weight is most effective. If the amount is less than 0.5 parts by weight, the odor removal effect is insignificant, and there is a problem that the chemical reaction does not occur well. When the amount is added more than 10 parts by weight, excess calcium oxide (CaO) and calcium hydroxide (Ca (OH) ₂ ), There is a problem that differentiation occurs.

Here, the grain size of the calcium oxide (CaO) and calcium hydroxide (Ca (OH) ₂ ) is preferably 0.1 mm to 1 mm, more preferably 0.1 mm to 0.4 mm. If the particle size is less than 0.1mm, the cost of producing the particles is greatly increased, and the economy is inferior. If the particle size exceeds 1mm, differentiation of calcium oxide (CaO) and calcium hydroxide (Ca (OH) ₂ ) occurs, and odor removal is achieved. There is a problem that the speed increases rapidly.

In addition, magnesia contained naturally in calcium oxide (CaO) and calcium hydroxide (Ca (OH) ₂ ) is preferably minimized.

In addition, at least one of sodium carbonate (Na ₂ CO ₃ ) or sodium hydroxide (NaOH) may be further added, and the content thereof is preferably 2 parts by weight to 10 parts by weight based on 100 parts by weight of the organic sludge. More preferably 4 to 6 parts by weight is most effective. It is further added to further remove the odor by further improving the odor removing effect. If the content is less than 2 parts by weight, the odor removing effect is insignificant, and if it exceeds 10 parts by weight, rather than inhibits the chemical reaction, there is a problem in that the economic efficiency is also lowered.

In the reaction step (S10), the reaction temperature is preferably 10 ℃ to 30 ℃, the reaction time is 7 hours to 12 hours, more preferably from 8 to 10 hours at 12 ℃ to 18 ℃ most effective. . If the reaction temperature is out of the optimum range, there is a problem that the reaction rate is significantly lowered or side reactions are increased. If the reaction time is out of the optimum range, the reaction does not occur sufficiently, so that the odor reduction effect is lowered or the waste is overreacted. There is a problem that occurs.

In addition, in the reaction step (S10), the discharged basic odor is removed by a chemical solution washing method using a neutralizing agent, the neutralizing agent is preferably a sulfuric acid solution. Here, the chemical liquid cleaning method means that the chemical liquid is repeatedly used by separating and regenerating sulfide after alkali washing with an absorption tower. Any kind of neutralizing agent may be used, but it is most suitable for the present invention to use sulfuric acid solution as a result of several experiments. That is, the generated basic malodor is washed with a sulfuric acid solution has the advantage of being recycled as a fertilizer raw material such as ammonium sulfate fertilizer.

In addition, the hydrogen ion concentration (pH) of the organic sludge that has passed through the reaction step (S10) is preferably 8 to 10, more preferably 8.5 to 9.5, most preferably 9 is most effective. In consideration of the alkalinity is reduced by sulfur, carbon dioxide, etc. in the drying step (S20) below, the optimum value obtained by several experiments, the odor removal effect is maximized within the optimum hydrogen ion concentration range.

The calcium oxide (CaO) and the calcium hydroxide (Ca (OH) ₂ ) removes water from the organic sludge due to a hydration reaction and a reaction heat of 40 ° C. to 80 ° C., and the water to be removed is the calcium oxide (CaO) and the It is preferably 250 to 400 kg per ton of calcium hydroxide (Ca (OH) ₂ ). More preferably, it is effective to be 300 to 350 kg per ton. The reaction occurring in the reaction step (S10) is a hydration reaction, the reaction heat is generated in the reaction process. This is to remove the moisture from the organic sludge has the advantage of reducing the thermal energy added for drying in the following drying step (S20).

When the reaction step (S10) is made within the scope of the present invention, the reaction heat of 40 ° C to 80 ° C is generated, and thus 250 to 400 kg per ton of calcium oxide (CaO) and the calcium hydroxide (Ca (OH) ₂ ) Will remove moisture.

Next, the drying step (S20) is a step of drying the organic sludge that passed through the reaction step (S10) at a temperature of 300 ° C to 900 ° C for 15 minutes to 45 minutes. This is a process for lowering the water contained in the organic sludge to 10% or less, through which the water-soluble odor is generated secondary. However, in the present invention, the organic sludge that passed through the reaction step (S10) is soluble odor is diffused and discharged in the mixed atmosphere in the water vapor generated by the drying heat of the drying step (S20) to reduce the odor. However, in the present invention, by drying the organic sludge passed through the reaction step (S10) at a temperature of 300 ℃ to 900 ℃ 15 minutes to 45 minutes, so that the water-soluble odor is dissolved and removed in the water vapor generated during drying, the reaction step ( The acid odor adhered to the organic sludge in S10) is deposited on the organic sludge dried in the drying step (S20), and when mixed with limestone, a slag forming sedative is made.

When the slag forming agent is used in a steelmaking plant, the slag forming agent is burned at a converter temperature of 1300 ° C to 2000 ° C of the steelmaking plant, and the acidic odor deposited on the organic sludge is also burned and removed. That is, all acidic odors and water-soluble odors are removed.

Here, the drying temperature is preferably 300 ° C to 900 ° C, more preferably 500 ° C to 700 ° C is most effective. In addition, the drying time is preferably 15 minutes to 45 minutes, more preferably 25 minutes to 35 minutes is most effective. If the drying temperature is less than 300 ℃, the drying time is long and there is a problem that the acid odor is not incinerated sufficiently, if the temperature exceeds 900 ℃ not only economic efficiency is lowered by excessive heating, but rather the odor removal reaction does not occur sufficiently there is a problem. In addition, when the drying time is less than 15 minutes, the odor removal reaction may not proceed sufficiently, the odor may remain, and if it exceeds 45 minutes, there is a problem that the economic efficiency is lowered.

That is, in order to exert the maximum odor removal effect at the minimum cost as a result of several experiments, it is preferable to perform a drying step within the scope of the present invention.

The present invention may be utilized to remove various odors of organic sludge, in particular, it is optimized in the process of manufacturing a slag forming tablets used in the steelmaking process of steel mills can be utilized to effectively remove the odor unlike the conventional.

Hereinafter will be described the chemical principle of the complex odor removal method of the organic sludge using the alkali material according to the present invention.

First, let's look at the components of each odor.

Ammonia, hydrogen sulfide, methyl mercaptans, amines and the like are mainly generated in organic sludge such as paper sludge. That is, the compound odor is generated. Here, most of the complex odors are not due to some specific odorous substances, but are multi-component substances composed of very many components.

In addition, the strength of the multi-component odor is not simply represented by the sum of the components because there is a complex action of the odor-causing components, causing a synergy, additive action, offset action, etc., many changes depending on the type of the substance Some of these substances will be recognized as odors.

Although not all kinds of odors can be represented, the main types of odors generated during the decontamination process of paper sludge include perishable odors such as rotting eggs and fish, ammonia, sweat and strong stimulating odors. Separate them with>.

compound Character of smell Cause name
Sulfur compounds
Onion, cabbage rotten Methyl mercaptan (CH ₃ SH),
Methyl sulfide [(CH ₃ ) ₂ S]
Methyl Disulfide (CH ₃ SSCH ₃ ) Rotting egg Hydrogen sulfide (H ₂ S)

Nitrogen compounds
Manure smell Ammonia (NH ₃ ),
Ethylamine (CH ₃ CH ₂ NH ₂ )
Rotten fish Methylamine (CH ₃ NH ₂ ),
Trimethylamine
[(CH ₃ ) ₃ N] etc.



Fatty acids
Irritating Smell Propionic acid
(CH ₃ CH ₂ COOH), etc.
Sweat smell Normal butyric acid
[CH ₃ (CH ₂ ) COOH]
In wet shoes
I smell Normal valeric acid
[CH ₃ (CH ₂ ) ₃ COOH],
Isovaleric acid
[(CH ₃ ) ₂ CHCH ₂ COOH] etc.

The chemical reaction of the present invention for the complex odor as described above is made as follows, it is possible to completely remove each odor component through the first and second stages.

First, as for the basic gas is ammonia (NH ₄ OH),

NH ₄ OH + CaO → NH ₃ ↑ + Ca (OH) ₂ ↓

NH ₄ OH + Ca (OH) ₂ → NH ₃ ↑ + Ca (OH) ₂ ↓ + H ₂ O

As for methylamine (CH ₃ NH ₂ ),

CH ₃ NH ₂ + H ₂ O + CaO → CH ₃ NH ₂ ↑ + Ca (OH) ₂ ↓

CH ₃ NH ₂ + H ₂ O + Ca (OH) ₂ → CH ₃ NH ₂ ↑ + Ca (OH) ₂ ↓ + H ₂ O

As for ethylamine (C ₂ H ₅ NH ₂ ),

C ₂ H ₅ NH ₂ + H ₂ O + CaO → C ₂ H ₅ NH ₂ ↑ + Ca (OH) ₂ ↓

C ₂ H ₅ NH ₂ + H ₂ O + Ca (OH) ₂ → C ₂ H ₅ NH ₂ ↑ + Ca (OH) ₂ ↓ + H ₂ O

As for trimethylamine [(CH ₃ ) ₃ N],

(CH ₃ ) ₃ N + H ₂ O + CaO → (CH ₃ ) ₃ N ↑ + Ca (OH) ₂ ↓

(CH ₃ ) ₃ N + H ₂ O + Ca (OH) ₂ → (CH ₃ ) ₃ N ↑ + Ca (OH) ₂ ↓ + H ₂ O

For the following, the acid gas is hydrogen sulfide (H ₂ S),

H ₂ S ↑ + CaO → CaS ↓ + H ₂ O

H ₂ S ↑ + Ca (OH) ₂ → CaS ↓ + 2H ₂ O

About mercaptan (CH ₃ SH),

CH ₃ SH ↑ + CaO → CaS ↓ + CH ₃ OH

CH ₃ SH ↑ + Ca (OH) ₂ → CaS ↓ + CH ₃ OH + H ₂ O

Through the above reaction, basic odor is discharged in gaseous form, acidic odor is fixed to organic sludge as insoluble salt and burned and removed at high temperature of converter during steelmaking process, and water-soluble odor is dissolved by water vapor in drying step, It goes through the process. By utilizing the scientific principle to the maximum, the present invention can significantly reduce the complex odor from the initial dilution multiple 1500 to 300 or less.

Hereinafter, to demonstrate the superiority of the method for removing complex odor of organic sludge using the alkali material of the present invention through an experiment. As a result of measuring the complex odor concentration on the paper sludge 1 day after the import, Comparative Example 1, which is 1500 times dilution, and Examples 1 to 3, which were treated by the removal process falling within the scope of the present invention, so as to deviate somewhat from the scope of the present invention. The conditions were set to compare Comparative Examples 2 to 4 subjected to the removal step to determine whether the odor removal effect of the present invention is excellent. Here, the content was measured based on 100 parts by weight of organic sludge.

The experimental results are shown in Table 2 below.

CaO or (Ca (OH) ₂ ) Na ₂ CO ₃ or NaOH CaO or (Ca (OH) ₂ )
Granularity Reaction
Temperature (℃) Odor Concentration
Dilution factor Example 1 0.5 - 0.1 10 252 times Example 2 9 5 0.5 20 117 times Example 3 10 2 One 30 190 times Comparative Example 1 - - - - 1500 times Comparative Example 2 0.3 One 0.1 20 523 times Comparative Example 3 15 11 0.5 30 385 times Comparative Example 4 5 - 1.5 50 327 times

As can be seen from the above experimental results, it can be seen that the odor concentration removal effect of Examples 1 to 3 belonging to the present invention is up to 10 times or more superior to Comparative Examples 1 to 4, and the content, particle size and It was found that Comparative Examples 2 to 4, which partially deviated from the reaction temperature, did not sufficiently remove odors.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

Claims (8)

In the method of removing odor of organic sludge using an alkaline substance,
At least one of calcium oxide (CaO) or calcium hydroxide (Ca (OH) ₂ ) is added to 100 parts by weight of the organic sludge and 0.5 to 10 parts by weight is added to react at a temperature of 10 ° C. to 30 ° C. for 7 to 12 hours. A method for removing complex odors of organic sludge using an alkaline substance, comprising: a reaction step of fixing the organic sludge as an insoluble salt.
The method of claim 1,
Further comprising the drying step of drying the organic sludge after the reaction step at a temperature of 300 ℃ to 900 ℃ for 15 to 45 minutes; In the drying step, water-soluble odor is dissolved and removed by the water vapor generated during drying Complex odor removal method of organic sludge using alkaline substance
3. The method according to claim 1 or 2,
In the reaction step, the discharged basic odor is removed by a chemical solution washing method using a neutralizing agent, the neutralizing agent is a complex odor removal method of organic sludge using an alkaline substance, characterized in that the sulfuric acid solution.
3. The method according to claim 1 or 2,
In the reaction step, the organic sludge is a paper sludge, the composite odor removal method of organic sludge using an alkaline material, characterized in that the water content is 50% to 90%.
3. The method according to claim 1 or 2,
In the reaction step, based on 100 parts by weight of the organic sludge, at least one of sodium carbonate (Na ₂ CO ₃ ) or sodium hydroxide (NaOH) is added to 2 to 10 parts by weight of the organic material using an alkaline substance, characterized in that How to remove sludge
3. The method according to claim 1 or 2,
In the reaction step, the grain size of the calcium oxide (CaO) and calcium hydroxide (Ca (OH) ₂ ) is 0.1mm to 1mm composite odor removal method of the organic sludge using an alkaline material, characterized in that.
3. The method according to claim 1 or 2,
In the reaction step, the calcium oxide (CaO) and the calcium hydroxide (Ca (OH) ₂ ) is removed from the organic sludge due to the hydration reaction and the heat of reaction of 40 ℃ to 80 ℃, the moisture is removed the calcium oxide (CaO) and the complex odor removal method of the organic sludge using an alkaline substance, characterized in that 250 to 400kg per ton of calcium hydroxide (Ca (OH) ₂ )
3. The method according to claim 1 or 2,
Hydrogen ion concentration (pH) of the organic sludge that passed through the reaction step is a method for removing complex odor of organic sludge using an alkaline substance, characterized in that 8 to 10.

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