JP2011078875A - Method for oxidatively decomposing organic compound - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for oxidatively decomposing an organic compound by which computational algorithm of necessary total mole number of OH radical or the like is established firstly and especially automation, controlling and tooling thereof are achieved secondarily. <P>SOLUTION: In the method for oxidatively decomposing the organic compound, a first step in the case of having a hydroxyl group, a second step in the case of having a hydrogen atom attached to a carbon atom or an oxygen atom and then a third step where the hydroxyl group is regenerated are repeated under participation of an OH radical to a hardly decomposable organic compound which is an object 1. Furthermore, if necessary, a fourth step of a reduction pattern by nascent hydrogen produced under participation of the OH radical is also added. By repeating each of these steps, the organic compound which is the object 1 is subjected to oxidative decomposition and is turned to inorganic substances such as water, gaseous carbon dioxide, oxygen molecules. A controller 11 such as a microcomputer 14 where these steps are programmed can be also utilized. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a method for oxidative decomposition of an organic compound. That is, the present invention relates to an oxidative decomposition method in which a hardly decomposable organic compound composed of elements such as carbon, hydrogen, and oxygen is oxidized and mineralized by OH radicals (.OH).

《Technical background》
For example, organic compounds such as benzene, toluene, phenol, and estradiol are composed of elements such as carbon, hydrogen, and oxygen, and are hardly decomposable. For example, it is used, produced, and discharged in various manufacturing processes, but it is often made of a volatile organic compound (VOC) dissolved in water, and may be discharged as a residual medicine or a residual agricultural chemical.
Such organic compounds are dissolved and contained in waste liquids, etc., and are often discharged into the environment as groundwater, river water, lake water, etc., causing environmental pollution and serious adverse health effects. It is going

<Conventional technology>
On the other hand, effective purification treatment technology and detoxification treatment technology for this type of organic compound have not been established. The processing needs of this type of organic compounds contained in waste liquids and the like are expected to increase in the future, but due to their difficulty of decomposition and the like, effective processing techniques have not yet been established.
As for this type of processing technology, the conventional technologies that have been developed and used have been pointed out with great difficulty in terms of equipment cost and running cost.
The only Fenton process technology that generates OH radicals with hydrogen peroxide and iron salts and oxidatively decomposes and mineralizes this type of organic compound has been proposed and attracting attention.

Examples of such a processing technique based on the Fenton method include those disclosed in Patent Documents 1 and 2 below.
JP 2006-334570 A JP 2007-50314 A

About the problem
By the way, the following subject was pointed out about the processing technology and the oxidative decomposition method by the conventional Fenton method.
As is well known, OH radicals have a strong oxidizing power and decomposing power, and are excellent in the mineralization power of hardly decomposable organic compounds. However, since it is a radical and highly reactive, it is a chemical species that has an instantaneous existence time and an extremely short lifetime, and improvement of the generation efficiency and reaction efficiency generated by chain reactions are important themes. .
On the other hand, the conventional Fenton process technology has low OH radical production efficiency, for example, because hydrogen peroxide is easily decomposed into water and oxygen in the middle, and other than the desired oxidative decomposition reaction. The reaction efficiency was poor, for example, the subsequent reaction was likely to occur.
In other words, OH radicals are not used for oxidative decomposition by attacking the difficult-to-decompose organic compounds to be treated, but they disappear, loss that generates unstable intermediate products, water, carbonic acid Problems such as low ratio of mineralization to gas, oxygen, etc. have been pointed out.

About the cause
Such a problem pointed out about the conventional Fenton method was basically caused by insufficient grasp of the oxidative decomposition process by OH radicals. The root cause of the problems of the conventional example is insufficient elucidation of the following points.
That is, 1. corresponding to each organic compound to be treated. 1. Analysis of oxidative degradation mechanism 2. Elucidation of chemical formula of oxidative decomposition process, 3. Based on this, grasp the total number of moles of OH radicals required for oxidative decomposition. Insufficient elucidation of the amount of hydrogen peroxide and divalent iron ions added by the Fenton method.
Moreover, even if these elucidation progressed, the difficulty of performing these by hand calculation was pointed out especially. That is, 1. 1. A complicated oxidative decomposition process until the target organic compound is completely oxidized and mineralized, and 2. Be sure to follow the chemical formula process. Required total number of moles, and 4. In order to grasp the amount of addition, a huge amount of calculation and a lot of time and labor are required, and many mistakes are predicted.
Therefore, establishment of a calculation algorithm for the required total number of moles of OH radicals, etc., and automation, control, and tooling thereof were particularly desired.

<< Invention >>
In view of such circumstances, the organic compound oxidative decomposition method of the present invention has been made to solve the above-described problems of the prior art.
The present invention firstly establishes a calculation algorithm for the required total number of moles of OH radicals, and secondly proposes an oxidative decomposition method for organic compounds that can realize automation, control and tooling in particular. The purpose is to do.

<About Claim>
The technical means of the present invention for solving such a problem is as follows. First, claim 1 is as follows.
The method for oxidative decomposition of an organic compound according to claim 1 uses a hardly decomposable organic compound composed of at least two elements of carbon and hydrogen, or three elements added with oxygen as a treatment target,・ Oxidation decomposition and mineralization with OH). And it has the following 1st, 2nd, 3rd step.
That is, the presence or absence of a hydroxyl group (—OH) is determined for the target. If yes, the OH radical deprives the hydrogen atom of the hydroxyl group and oxidizes, and then returns to water and is released outside the system. The first step of double-bonding the oxygen atom of the hydrogen atom and the presence or absence of a hydrogen atom (H) attached to the carbon atom or oxygen atom is determined for the target. If yes, the OH radical takes the hydrogen atom and oxidizes And the second step of returning to water and returning to the outside of the system, and the target with respect to the unpaired electron of the carbon atom and the unpaired electron of the oxygen atom generated in the second step. And a third step in which hydroxyl groups are regenerated by addition of OH radicals.
The first step and the second and third steps are repeated.

About Claim 2, it is as follows.
In the method for oxidative decomposition of an organic compound according to claim 2, when hydrogen atoms are depleted and oxidized for the object in claim 1, the process proceeds to the next fourth step.
In the fourth step, first, the subsequent OH radicals oxidize by depriving hydrogen molecules from water molecules, and return themselves to water and liberate out of the system, while generating oxygen molecules, H ⁺ + e ⁻ ) is generated. Then, the generational hydrogen is characterized in that the target from which hydrogen atoms have been depleted is reduced and hydrogenated, and the process proceeds to the second step.
About Claim 3, it is as follows.
In the method for oxidative decomposition of an organic compound according to a third aspect, in the first aspect, the hydroxyl group in the first step includes a carboxyl group (—COOH). In the case of the carboxyl group, the valence electrons move with the double bond of the oxygen atom in the first step, so that carbon dioxide gas is generated and released out of the system. .

About Claim 4, it is as follows.
In the oxidative decomposition method of an organic compound according to claim 4, in the case of the aldehyde group (—CHO) having a hydrogen atom in claim 1, the following third to the vacancy of the hydrogen atom deprived in the second step. As OH radicals are added and hydroxylated in steps, and oxygen atoms are double-bonded in the subsequent first step, valence electrons move, so that carbon dioxide gas is generated and released outside the system.
In the case of a methylene group having a hydrogen atom (—CH ₂ —), addition of an OH radical in the subsequent third step to the vacancy of the hydrogen atom deprived in the second step, hydroxylation, and further to the subsequent step As oxygen atoms are double-bonded in the first step, valence electrons move, and carbon dioxide gas is generated and released outside the system.
In the case of a methyl group having a hydrogen atom (CH _3- ), addition of an OH radical in the subsequent third step, hydroxylation to the vacancy of the hydrogen atom deprived in the second step, followed by the subsequent second step As oxygen atoms are double-bonded in one step, valence electrons move, and carbon dioxide and oxygen molecules are generated and released outside the system.
In the case of a carbonyl group (—C═O—), the valence electrons are added along with the addition of OH radicals and hydroxylation in the third step and the double bonding of oxygen atoms in the subsequent first step. It moves, so that carbon dioxide is generated and released out of the system.
In the case of an ether group (—O—), valence electrons move due to the addition of OH radicals and hydroxylation in the third step, followed by the double bond of oxygen atoms in the subsequent first step. Thus, oxygen molecules are generated and released out of the system.

About Claim 5, it is as follows.
In the method for oxidative decomposition of an organic compound according to claim 5, in claim 1, 2, 3, or 4, the required total number of OH radicals required for oxidative decomposition of the target is calculated based on the reaction formula in each step. It is characterized by that.
About Claim 6, it is as follows.
In the oxidative decomposition method of an organic compound according to claim 6, in claim 5, OH radicals are generated by the Fenton method, and the amount of hydrogen peroxide and divalent iron ions added is the required total number of moles of OH radicals. And calculated based on the Fenton method.
About Claim 7, it is as follows.
In the method for oxidative decomposition of an organic compound according to a seventh aspect, in the sixth aspect, first, the concentration of the target is detected by the detection means, and the constituent components of the target and the number of moles thereof are input by the input means. Thus, based on the detected concentration of the object and the components and moles entered, the controller causes the required total number of moles of OH radicals required for oxidative degradation of the object, and hydrogen peroxide and divalent The amount of iron ion added is calculated.
Then, based on an instruction from the control device, the hydrogen peroxide addition unit and the iron ion addition unit add the added amount of hydrogen peroxide and divalent iron ions to the target aqueous solution. Features.

About Claim 8, it is as follows.
In an oxidative decomposition method of an organic compound according to an eighth aspect, the control device according to the seventh aspect is configured by a computer. Then, the program repeats the first, second, third, and fourth steps, thereby calculating the number of moles of OH radicals required for each step, and based on the step processing, The calculation processing of the required total number of moles of OH radicals required for the target oxidative decomposition and the calculation processing of the addition amount of hydrogen peroxide and divalent iron ions based on this are performed.
About Claim 9, it is as follows.
In the oxidative decomposition method of an organic compound according to a ninth aspect, the control device according to the seventh aspect is configured by a computer. Then, the program searches the data stored in advance and extracts the number of moles of OH radicals necessary for the oxidative decomposition of the constituent components of the target, and the target of the target based on the data search processing A calculation process of the required total number of moles of OH radicals required for oxidative decomposition and a calculation process of the addition amount of hydrogen peroxide and divalent iron ions based on this are performed.

<About the action>
Since the present invention comprises such means, the following is achieved.
(1) The water to be treated containing the target organic compound is supplied to the Fenton treatment tank.
(2) Hydrogen peroxide and iron ions are added.
(3) Therefore, OH radicals are generated.
(4) The OH radical has a strong oxidizing power and decomposing power, and mineralizes the target organic compound into water, carbon dioxide gas, oxygen and the like.
(5) In the present invention, the target organic compound is oxidatively decomposed in the next step. That is, each step such as the first step in the case of having a hydroxyl group, the second step in the case of having a hydrogen atom attached to a carbon atom or an oxygen atom, and the third step in which the hydroxyl group is regenerated thereafter is performed under the participation of OH radicals. Is repeated. Note that a fourth step of reduction with nascent hydrogen may be added.
(6) Thus, the oxidative decomposition process and the chemical formula process are specifically grasped by the patterned steps. Therefore, the required total number of moles of OH radicals and the amount of hydrogen peroxide and iron ions added can be calculated easily and reliably.
(7) Such a calculation algorithm is automated, controlled, and tooled by using a control device such as a computer.
(8) For example, by performing the first, second, third, and fourth step processes, the stored data retrieval process, the required total mole number calculation process, the addition amount calculation process, and the like in a computer program The above is easily and reliably realized.
(9) The required total number of moles of OH radicals is calculated, set, and prepared more frequently than the number of moles calculated as the required theoretical total number of moles. Accordingly, the amount of hydrogen peroxide and iron ions added is also the same.
(10) Now, the method for oxidative decomposition of an organic compound of the present invention exhibits the following effects.

<< First effect >>
First, by the oxidative decomposition method of the present invention, a calculation algorithm such as a required total number of moles of OH radicals is established.
That is, by applying the patterned first, second, third, and fourth steps to each organic compound to be treated, the oxidative decomposition process and the chemical formula process of each organic compound can be made concrete. Elucidated and understood. Therefore, the required total number of moles of OH radicals and the amount of hydrogen peroxide and iron ions added by the Fenton method can be calculated easily and reliably.
Thus, in the present invention, a calculation algorithm such as the required total number of moles of OH radicals is established. Therefore, the generation and reaction of OH radicals with no excess or deficiency are possible, and the generation efficiency and reaction efficiency of OH radicals are improved as compared with the above-described conventional example. Loss generation, in which chain-generated and short-lived OH radicals disappear without being used for oxidation, prevents intermediate product loss due to secondary reactions, and improves mineralization rate To do.

<< Second effect >>
Secondly, automation, control, and tooling of the above-described calculation algorithm are realized particularly by the oxidative decomposition method of the present invention.
In the present invention, by using a control device such as a computer, a calculation algorithm such as a necessary total number of moles of OH radicals is automated, controlled, and tooled for oxidative decomposition and mineralization of a target organic compound.
In other words, by adding concentration detection means and target input means, and then performing various arithmetic processing based on the program software, the required total number of moles of OH radicals, hydrogen peroxide, iron The amount of ions added is calculated. Compared to the above-described conventional example, which requires a lot of time and labor by manual calculation and there is a risk of frequent mistakes, the realization of automation, control, and tooling is significant.
As described above, the effects exerted by the present invention are remarkably large, such as all the problems existing in this type of conventional example are solved.

BRIEF DESCRIPTION OF THE DRAWINGS It is used for description of the form for implementing the invention about the oxidative decomposition method of the organic compound which concerns on this invention, and is an entire structure flow figure. FIG. 3 is a block diagram illustrating a configuration of a computer or the like of a control device for explanation of an embodiment for carrying out the invention. FIG. 5 is a functional block diagram of a main part of a computer of a control device for explaining an embodiment for carrying out the invention. . It is used for description of the form for implementing this invention, and is a flowchart of one example of a process step, (1) FIG. Is related with 1st step, (2) FIG. Is related with 2nd step. It is used for description of the form for implementing this invention, and is a flowchart of an example of a processing step, (1) FIG. Is related with 3rd step, (2) FIG. Is related with 4th step.

Hereinafter, embodiments for carrying out the present invention will be described in detail.
In the following, "processing object", "Fenton method", "OH radical generation", "Outline of the present invention", "Specific examples of oxidative decomposition", "Calculation algorithm for OH radicals", "Control device, etc." , “Control Example (Part 1)”, “Control Example (Part 2)”, “Action, etc.” will be described in the order of items.

<< Processing target 1 >>
In the oxidative decomposition method of the present invention, a hardly decomposable organic compound composed of at least two elements of carbon (C) and hydrogen (H), or three elements added with oxygen is treated 1 (hereinafter simply referred to as object 1). The target 1 in the aqueous solution is oxidatively decomposed with OH radicals (.OH) and thus mineralized into water (H ₂ O), carbon dioxide (CO ₂ ), oxygen (O ₂ ), or the like.
First, the organic compound which becomes the object 1 is composed of two elements of carbon and hydrogen and three elements to which oxygen is added. For example, the following substances may be considered.
・ Benzene (C ₆ H ₆ )
Toluene _{(C 6} H 5 _CH 3)
Phenol _{(C 6} H 5 OH)
Xylene _{(C 6 H 4 (CH 3} ) 2)
・ Ethyl acetate (CH ₃ COOCH ₂ CH ₃ )
・ Formaldehyde (HCHO)
Estradiol _{(C 18 H} 24 _O 2)

About the Fenton method
The oxidative decomposition method of the present invention oxidizes and decomposes such an organic compound with OH radicals.
As a method for generating OH radicals and an oxidative decomposition method using OH radicals, the Fenton method is typical. First, the outline of the Fenton method will be described with reference to FIG.
The illustrated Fenton process apparatus 2 includes a raw water tank 3, a Fenton treatment tank 4, and a post-treatment tank 5 in this order. The Fenton treatment tank 4 includes a hydrogen peroxide tank 6, an iron ion tank 7, and pH adjusting means. (Not shown) is attached.
The treated water 8 in which the organic compound of the target 1 is dissolved and contained is supplied from the raw water tank 3 to the Fenton treatment tank 4.

The Fenton treatment tank 4 is always adjusted to be weakly acidic by pH adjusting means. Then, at the beginning of the reaction, an aqueous solution of hydrogen peroxide (H ₂ O ₂ ) is supplied from the hydrogen peroxide tank 6 to the treated water 8 supplied to the Fenton treatment tank 4, and the hydrogen peroxide provided with a solenoid valve or pump. The whole amount is added as a Fenton reagent through the addition unit 9.
Then, a bivalent iron ion (Fe ²⁺ ) solution is provided with a solenoid valve and a pump by intermittently repeating a plurality of cycles for the water to be treated 8 of the Fenton treatment tank 4 to which hydrogen peroxide has been added as described above. In addition, it is divided and added as a Fenton reagent through the iron ion addition unit 10.
That is, substances that generate divalent iron ions in the liquid, such as ferrous sulfate heptahydrate (FeSO ₄ · 7H ₂ O), are typically used as such iron salts, but other anhydrous Salts and hydrated salts such as iron chloride (FeCl ₂ ) and hydrates thereof can also be used.
In the Fenton treatment tank 4, OH radicals are generated by the hydrogen peroxide and the divalent iron ions added in this manner, and the organic compound of the target 1 is oxidatively decomposed and mineralized.
In other words, the OH radical, that is, the hydroxy radical (.OH) has a strong electron scavenging power, oxidizing power, and decomposing power as well known, and is highly reactive with radicals. It is a chemical species with a short lifetime. Then, the OH radical dispersed in the water phase oxidizes the organic compound of the target 1 dissolved and contained in the water 8 to be treated, and eventually decomposes.
Thus, the water 8 to be treated, in which the organic compound is mineralized, passes through the post-treatment tank 5 and is agglomerated, precipitated, filtered, and pH-adjusted, and then drained and discharged.
For example, the Fenton method is as follows.

<Generation of OH radicals>
Next, an OH radical generation reaction formula and the like in the Fenton method will be described.
First, in the Fenton treatment tank 4, the added hydrogen peroxide is reduced with divalent iron ions added as a catalyst to generate OH radicals. That is, OH radicals are generated based on the following reaction formulas 1 and 2. This is the Fenton main reaction. When the reaction formulas of Chemical Formula 1 and Chemical Formula 2 are synthesized, the chemical formula of Chemical Formula 3 is obtained.

  Second, OH radicals are generated as in the first, and hydroxide ions generated by the reduction reaction of hydrogen peroxide in Chemical Formula 2 are converted into oxidation reactions of the divalent iron ions in Chemical Formula 1 above. Oxidized with trivalent iron ions generated in step OH, OH radicals are generated. That is, OH radicals can also be generated incidentally, secondaryly, and chained by the following reaction formulas 4 and 5.

  Third, OH radicals generated by the reaction formulas of Chemical Formula 3 (Chemical Formula 1, Chemical Formula 2) and Chemical Formula 4 and Chemical Formula 5 react with water such as the water to be treated 8 to generate new OH radicals. The reaction to produce water and water can be repeated in an incidental, secondary, and chain manner according to the following reaction formulas (6) and (7).

Fourth, the reaction in which trivalent iron ions generated by the oxidation reaction of divalent iron ions in Chemical Formula 3 (Chemical Formula 1) react with hydrogen peroxide to generate new OH radicals and the like. However, it is possible to repeat the incidental, secondary, and chaining repeatedly according to the following reaction formulas (8) and (9). When the reaction formulas of Chemical Formula 8 and Chemical Formula 9 are synthesized, the chemical formula of Chemical Formula 10 is obtained.
That is, the water 8 to be treated is alkalinized by a pH adjusting means, and hydrogen peroxide liberates protons (H ⁺ ) and the trivalent iron ions are converted into divalent iron ions in the reaction formula of chemical formula 8. While being reduced, a superoxide anion (.O ₂ ⁻ ) in which electrons are added to oxygen molecules is generated. Then, according to the reaction formula of Chemical Formula 9, this superoxide anion reacts with hydrogen peroxide to generate OH radicals.

フェントン法では、このようにＯＨラジカルが生成される。

In the Fenton method, OH radicals are thus generated.

<< Outline of the Present Invention >>
The present invention will be described below.
First, the outline of the present invention will be described with reference to the flowcharts of FIGS.
In the Fenton treatment tank 4 (see FIG. 1), the refractory organic compound of the object 1 made of elements such as carbon, hydrogen, oxygen, etc. is oxidized and mineralized by the OH radicals generated as described above. The
The oxidative decomposition and mineralization are performed by sequentially repeating the following first step, second step, third step, and further the fourth step.

FIG. 4 (1) relates to the first step.
First, as a premise, the chemical formula of the organic compound of the target 1 in STEP 1, specifically, the structural formula showing its constituent components is input (see target input means 13 described later).
In the first step routine, in STEP 2, the presence or absence of a hydroxyl group (—OH) is first determined for the target 1. When the hydroxyl group is present, the process proceeds to STEP 3 and STEP 4 where the OH radical (.OH) deprives the hydrogen atom (H) of the hydroxyl group and oxidizes to double bond the oxygen atom (O) of the hydroxyl group (= O And at STEP 5 itself returns to water (H ₂ O) and is released out of the system.
In STEP 6, the above described process is repeated until there is no hydroxyl group.

Next, FIG. 4B relates to the second step.
In the second step, which is a routine subsequent to the first step, first, in STEP 7, whether or not there is a hydrogen atom (H) attached to a carbon atom (C) or an oxygen atom (O) in the target 1 after the first step. Is determined. If there are hydrogen atoms, the process proceeds to STEP 8 and STEP 9 where OH radicals deprive the hydrogen atoms and oxidize, and in STEP 10, themselves return to water and are released outside the system.
In STEP 11, the above-described process is repeated until there are no more hydrogen atoms attached to carbon atoms or oxygen atoms.

FIG. 5A relates to the third step.
In the third step, which is a routine subsequent to the second step described above, first, in STEP 12, for the target 1 after the second step, the unpaired electrons (−) of the carbon atom (C) generated in the second step ) And the presence or absence of unpaired electrons of oxygen atoms (O). If there is an unpaired electron, the process proceeds to STEP 13 where an OH radical following the unpaired electron is added to regenerate the hydroxyl group.
Therefore, the flow returns to the first step of FIG. 4A described above through STEP 14 and repeats the first step.

FIG. 5 (2) relates to the fourth step.
In the first, second, and third steps described above, when hydrogen atoms such as hydroxyl groups, carbon atoms, oxygen atoms, etc. are depleted and oxidized for the target 1, the target 1 is usually as expected. It is decomposed into water, carbon dioxide, oxygen, etc. and made inorganic.
On the other hand, if the object 1 has not been completely mineralized even after the first, second and third steps, the process proceeds to the fourth routine which is the next routine.
In the fourth step, first in STEP 16, the subsequent OH radicals oxidize by taking hydrogen atoms from water molecules. Thus, it returns to water and liberates out of the system, and generates hydrogen molecules (H ⁺ + e ⁻ ) while generating oxygen molecules. Then, the generated hydrogen in the generation stage of STEP 17 reduces and hydrogenates the target 1 from which the hydrogen atoms of STEP 15 are depleted in STEP 18.
Therefore, the flow returns to the second step in FIG. 4 (2) described above through STEP 19, and the second step is repeated.
The outline of the present invention is as described above.

<< Specific examples of oxidative decomposition, etc. >>
The target 1, which is a hardly decomposable organic compound consisting of carbon, hydrogen, oxygen, etc., is often the first step, the second step, the third step, and the fourth step as necessary, in many cases. By being repeated many times, it is oxidatively decomposed and mineralized into water, carbon dioxide, oxygen and the like.
Here, specific examples of oxidative decomposition and mineralization of the substituents and hydrocarbons which are constituent components of the organic compound of the subject 1 will be described in detail below. Table 1 shows oxidative decomposition data of such specific examples.
In Table 1, R represents a basic part or residue other than structural components such as a substituent of an organic compound. R ′ represents a case where one hydrogen atom is less than R. R and R "may be the same.

First, the carboxyl group (—COOH) is represented by the item No. in Table 1. As shown in FIG.
That is, when a carboxyl group is first included in the organic compound that is the target 1, or when a carboxyl group is generated in the middle by a step treatment, the first step ((1) in FIG. 4 is performed). Follow). As the oxygen atom (O) is double-bonded in the first step, valence electrons move, so that carbon dioxide (CO ₂ ) is generated and released outside the system.
After all, regarding the oxidative decomposition treatment of 1 mol (constituent equivalent, the same applies hereinafter) of the carboxyl group, 1 mol of OH radical is involved and consumed, thereby producing 1 mol of water and 1 mol of carbon dioxide. The

Next, the hydroxyl group (—OH) is determined according to the item No. 1 in Table 1. As shown in FIG.
That is, when a hydroxyl group is first included in the organic compound to be the target 1, or when a hydroxyl group is generated in the middle by the step treatment, the first step (see FIG. 4 (1)) Follow.
Therefore, regarding the oxidative decomposition treatment of 1 mol of hydroxyl group, 1 mol of OH radical is involved and consumed, so that 1 mol of water is generated.

In addition, the aldehyde group (—CHO) is the item No. in Table 1. As shown in FIG.
That is, when an aldehyde group is first included in the organic compound to be the target 1, or when an aldehyde group is generated in the middle by step treatment, first, the second step ((2) in FIG. 4). Follow the diagram). In the case of an aldehyde group having a hydrogen atom (H), addition of an OH radical, hydroxylation in the third step (see FIG. 5 (1)) to the vacant position of the deprived hydrogen atom, As the oxygen atoms are double-bonded in the subsequent first step (see FIG. 4 (1)), the valence electrons move, so that carbon dioxide gas is generated and released out of the system.
Eventually, regarding the oxidative decomposition treatment of 1 mol of aldehyde groups, 3 mol of OH radicals are involved and consumed, so that 2 mol of water and 1 mol of carbon dioxide gas are generated.

Next, the methyl group (CH _3- ) is selected from the item No. 1 in Table 1. As shown in FIG.
That is, when a methyl group is first included in the organic compound to be the target 1, or when a methyl group is generated in the middle by the step treatment, first, the second step is followed. In the case of a methyl group having a hydrogen atom, the OH radical is added and hydroxylated in the subsequent third step in the subsequent vacancy of the deprived hydrogen atom, and further, the oxygen atom doubled in the subsequent first step. Along with the binding, the valence electrons move, so that carbon dioxide gas and oxygen molecules are generated and released outside the system.
After all, regarding the oxidative decomposition treatment of 1 mol of methyl group, 9 mol of OH radical is involved and consumed, so that 6 mol of water, 1 mol of carbon dioxide gas and 1/2 mol of oxygen molecule are obtained. Generated.

Next, hydrocarbons (for example, alkyl groups) in general are as follows. In this case, item NO. As shown in FIG.
That is, the hydrocarbon of the constituent component in the organic compound to be the target 1 (the case where it is initially included and the case where it is generated in the middle by the step treatment, in any case) The steps, the third step, and the first step are followed in order, so that water is generated and released out of the system.
Consequently, regarding the oxidative decomposition treatment of 1 mol of the hydrocarbon component as a constituent component in the organic compound, 3 mol of OH radicals are involved and consumed, thereby generating 2 mol of water.

Next, the methylene group (—CH ₂ —) corresponds to the item No. As shown in FIG.
That is, when the methylene group is first included in the organic compound to be the target 1, or when the methylene group is generated in the middle by the step treatment, first, the second step is followed. In the case of a methylene group having a hydrogen atom, addition of an OH radical and hydroxylation in the subsequent third step to the vacant position of the deprived hydrogen atom, followed by the double oxygen atom in the subsequent first step. Along with the bonding, the valence electrons move, so that carbon dioxide gas is generated and released outside the system.
Eventually, regarding the oxidative decomposition treatment of n moles of methylene groups, 6 nmoles of OH radicals are involved and consumed, thereby producing 4 nmoles of water and n moles of carbon dioxide.

The carbonyl group (—C═O—) is represented by the item No. 1 in Table 1. As shown in FIG.
That is, when the carbonyl group is first included in the organic compound to be the target 1, or when the carbonyl group is generated in the middle by the step treatment, first, the third step is followed. In the case of a carbonyl group having no hydrogen atom (—C═O—), the OH radical is added and hydroxylated in the third step, and the oxygen atom is double-bonded in the subsequent first step. Along with this, the valence electrons move, so that carbon dioxide gas is generated and released outside the system.
Eventually, regarding the oxidative decomposition treatment of n moles of carbonyl groups, 2 nmoles of OH radicals are involved and consumed, thereby producing n moles of water.

Next, the ether group (—O—) is represented by the item No. 1 in Table 1. As shown in FIG. 8, it is oxidatively decomposed.
That is, when the ether group is first included in the organic compound to be the target 1, or when it is generated in the middle by the step process, first, the third step is followed. In the case of an ether group having no hydrogen atom, the valence electrons move along with the addition of OH radicals and hydroxylation in the third step and the subsequent double-bonding of oxygen atoms in the first step. Thus, oxygen molecules are generated and released out of the system.
Eventually, regarding the oxidative decomposition treatment of n moles of ether groups, 2 moles of OH radicals are involved and consumed, so that n moles of water and n moles of oxygen molecules are generated.

Here, an example of the fourth step will be described.
For example, an intermediate product generated in the process of oxidative decomposition of the target 1, that is, an intermediate product that has been generated as a constituent component of the target 1 as a result of following the first, second, and third steps has already been obtained. When the hydrogen atom is depleted by OH radicals, the intermediate product is reduced by the nascent hydrogen (H ⁺ + e ⁻ ) as described above, and proceeds to the second step again. become.
For example, such an intermediate product (O═C═C═O) is converted to formaldehyde (H—CHO) in the reaction formula of Chemical Formula 11 in this fourth step, and then returned to the second step. Therefore, it is mineralized by the reaction formula of Chemical Formula 12.

酸化分解等の具体例については、以上詳述したとおりである。

Specific examples such as oxidative decomposition are as described in detail above.

<< Calculation algorithm for OH radicals >>
In this oxidative decomposition method, the required total number of moles of OH radicals required for the oxidative decomposition of the target organic compound is calculated based on the reaction formulas in the first, second, third, and fourth steps. Is done.
Since OH radicals are typically generated by the Fenton method, the amount of hydrogen peroxide and divalent iron ions added depends on the calculated total number of moles of OH radicals and the reaction formula of the Fenton method. Based on

This calculation algorithm will be described in further detail. First, for the hardly decomposable organic compound to be the target 1, the first step in the case of having a hydroxyl group (see FIG. 4 (1)) and the case of having a hydrogen atom attached to a carbon atom or an oxygen atom. Two steps (see FIG. 4 (2)) and a third step (see FIG. 5 (1)) in which the hydroxyl group is regenerated are sequentially repeated with the participation of OH radicals. . Furthermore, if necessary, a fourth step (see FIG. 5 (2)) of the reduction pattern by nascent hydrogen (H ⁺ + e ⁻ ) generated by participation of OH radicals is added.
By following these steps, the organic compound of the target 1 is oxidatively decomposed and mineralized into water, carbon dioxide gas, oxygen molecules, and the like. For specific examples of the oxidative decomposition and mineralization of the constituent components that form the core, see the section described above with reference to Table 1.
Then, the theoretical total number of OH radicals necessary to oxidatively decompose the target 1 is calculated by following the chemical formulas of these steps in a process. In each chemical formula of oxidative decomposition, the required theoretical total number of moles is calculated by adding the number of moles of OH radicals involved and used on the raw material side (left side).
In practice, the larger required total number of moles is quantitatively calculated based on the calculated theoretical total number of moles of OH radicals.

When the required total number of moles of OH radicals is calculated, the required addition amount of hydrogen peroxide and divalent iron ions by the Fenton method is also calculated based on this. That is, the addition amount of hydrogen peroxide and iron ions necessary to generate the total number of moles of OH radicals is also calculated based on the Fenton method reaction formula.
Regarding the reaction formula of OH radical generation by the Fenton method, the main reaction of the chemical formula 1, chemical formula 2, (chemical formula 3), the chemical formula 4, chemical formula 5, the chemical formula 6, chemical formula 7, the chemical formula 8, chemical formula 9 See side reactions such as (Chemical Formula 10).
Specifically, depending on the weighting of the secondary reaction relative to the main reaction, in practice, the amount of hydrogen peroxide added is, for example, 1.5 mol or 2 mol OH radicals from 1 mol hydrogen peroxide. To be generated, it is calculated quantitatively. The amount of iron ion added depends on the oxidation properties of the target 1, but is actually calculated by calculating a coefficient from the amount of hydrogen peroxide added.
The algorithm for calculating the total number of moles of OH radicals is as follows.

<< About the control device 11 etc. >>
Next, automation, control, and tooling of such an oxidative decomposition method will be described with reference to FIG.
For the automation, control, and tooling of the oxidative decomposition method based on the calculation algorithm described above, the concentration detection means 12, the target input means 13, the control device 11, the hydrogen peroxide addition section 9, the iron ion addition section 10, etc. are used. Is done.
First, the concentration detection unit 12 detects the concentration of the target 1, and the target input unit 13 inputs the component of the target 1 and the number of moles (component equivalent). Based on the concentration thus detected and the input component and the number of moles thereof, the control device 11 causes the required total number of moles of OH radicals required for the oxidative decomposition of the target 1, hydrogen peroxide and divalent The amount of iron ion added is calculated.
Then, based on the instruction signal from the control device 11, the hydrogen peroxide addition unit 9 and the divalent iron ion addition unit 10 add the amount of hydrogen peroxide and 2 to the aqueous solution of the target 1, that is, the water 8 to be treated. Valent iron ions are added.

These will be further described in detail. The concentration detection means 12 is attached to the raw water tank 3, and for example, a TOC (total organic carbon) automatic measuring device is used, and the concentration of the target 1 in the treated water 8, that is, the concentration of organic compound (for example, mg / L). The measurement data is input to the control device 11.
The target input means 13 inputs the component and the number of moles (component equivalent) of the organic compound to be the target 1 to the control device 11. That is, the target input means 13 uses the keyboard or the like to refer to the chemical structural formula of the target 1 and to configure the constituents of the organic compound, that is, the configuration of each substituent, hydrocarbon, etc., carbon, hydrogen, oxygen, Input to the control device 11.
Then, the control device 11 calculates the total number of moles of OH radicals necessary for the oxidative decomposition of the target 1 based on the concentration data thus input, the constituent components of the target 1 and the number of moles thereof (this calculation). See above for the algorithm). When the required total number of moles of OH radicals is calculated, the addition amount of hydrogen peroxide and divalent iron ions is usually calculated based on a quantitative positive number and a quantitative coefficient.
Accordingly, the control device 11 outputs an addition amount instruction signal to the hydrogen peroxide addition unit 9 and the iron ion addition unit 10 via the drive circuit 15. Therefore, the hydrogen peroxide addition unit 9 adds the hydrogen peroxide in the hydrogen peroxide tank 6 to the Fenton treatment tank 4 by a predetermined amount. Further, the iron ion addition unit 10 divides and adds divalent iron ions in the iron ion tank 7 to the Fenton treatment tank 4 by a predetermined addition amount.
As the control device 11, a microcomputer 14 is typically used. As is well known, the microcomputer 14 includes a CPU 16, a RAM 17, a ROM 18, a storage device 19, an input port 20, an output port 21, and the like as shown in FIG.
The control device 11 and the like are as described above.

<< Control example (1) >>
Next, a specific example (part 1) of such control will be described with reference to FIGS.
In the oxidative decomposition method of this control example, the control device 11 is configured by a microcomputer 14 and performs the following step processing, total mole number calculation processing, addition amount calculation processing, and the like.
That is, a step of calculating the number of moles of OH radicals required for each step by sequentially repeating the first, second, third, and fourth steps based on the program shown in FIGS. Based on this process, a process for calculating the total number of moles of OH radicals required for the oxidative decomposition of the target 1 and a process for calculating the addition amount of hydrogen peroxide and divalent iron ions are performed.

Such a control example (part 1) will be further described in detail. As shown in FIG. 3, the microcomputer 16 used as the control device 11 has the CPU 16 first based on the program shown in the flowcharts of FIGS. The two-step processing unit 23, the third step processing unit 24, the fourth step processing unit 25, etc. sequentially function over time. This program is written in the ROM 18.
Then, the next step process is sequentially repeated with respect to 1 mol or n mol of the organic compound component of the object 1 input by the object input means 13.

The first step processing means 22 sequentially follows STEPs 1 to 6 in FIG. 4A to perform the first step input, determination, processing, and the like described above. In the second step processing means 23 subsequent to the first step, the above-mentioned determination and processing of the second step are performed by following STEPs 7 to 11 in FIG.
In the third step processing means 24 subsequent to the second step, the above-mentioned determination and processing of the third step are performed by following STEPs 12 to 14 in FIG. When the hydroxyl group is regenerated by the third step processing means 24, the flow returns to the first step.
Note that, by repeating the first, second, and third step processing means 22, 23, and 24, the constituent components of the organic compound of the target 1 are in principle completely mineralized.
On the other hand, if the mineralization is not exhausted, the flow proceeds to the fourth step processing means 25. The fourth step processing means 25 traces STEPs 15 to 19 in FIG. 5B and performs the above-described fourth step processing and determination. When reduction and hydrogenation are performed, the flow returns to the second step.

Next, as shown in FIG. 3, the CPU 16 of the microcomputer 14 functions as a total number-of-moles calculation means (part 1) 26 for OH radicals.
In this total number-of-moles calculation means (part 1) 26, first, OH radicals that are involved in the repetition of the first, second, third, and fourth steps in the oxidative decomposition of the organic compound that is the target 1 are consumed. Are added together (see above for the calculation algorithm). At the same time, the total number-of-moles calculating means (part 1) 26 converts the number of moles from the concentration (for example, mg / L) of the organic compound of the target 1 detected by the detecting means 12.
Based on these, the total number of moles of OH radicals necessary for the oxidative decomposition of the target 1 is first calculated.

Then, the CPU 16 of the microcomputer 14 functions as an addition amount calculating means (part 1) 27 for hydrogen peroxide and iron ions, as shown in FIG.
That is, this addition amount calculating means (part 1) 27 calculates the required number of moles of hydrogen peroxide based on the required total number of moles of OH radicals obtained as described above (the calculation algorithm is as described above). See).
When the required number of moles of hydrogen peroxide is calculated, the required addition amount is calculated based on the density, molecular weight, and mass. The necessary addition amount of iron ions is calculated by calculating a coefficient from the necessary addition amount of hydrogen peroxide. Accordingly, the calculated addition amount of hydrogen peroxide and iron ions is added.
In the control example (part 1), such control is performed.

<< Control example (2) >>
Next, a specific example (No. 2) of control will be described with reference to FIG. 1, FIG. 2, FIG. 3, and Table 1.
In the oxidative decomposition method of this control example, the control device 11 is constituted by a microcomputer 14 and performs the following data search processing, total mole number calculation processing, addition amount calculation processing, and the like.
That is, OH radicals necessary for the oxidative decomposition of the constituent component originally contained in the object 1 or the oxidative decomposition of the constituent component generated by the step process by searching the data stored in advance based on the program Data search process for extracting the number of moles of hydrogen, calculation process for the total number of moles of OH radicals required for oxidative decomposition of the target 1 based on this data search process, and hydrogen peroxide and divalent iron ions based on this The addition amount is calculated.

Such a control example (part 2) will be further described in detail. As shown in FIG. 3, the CPU 16 of the microcomputer 14 used as the control device 11 is based on the program written in the ROM 18, and as shown in FIG. 3, the data search processing means 28, the mole number calculation means (part 2) 29, the addition amount The calculation means (part 2) 30 and the like function sequentially with time.
At the same time, the storage device 19 of the microcomputer 14 stores the data in Table 1 described above as the oxidation decomposition data table 31. That is, the number of moles of OH radicals necessary for the oxidative decomposition is generally stored for each component of an organic compound composed of carbon, hydrogen, oxygen, and the like.

First, the data search processing unit 28 uses the constituent component of the organic compound of the target 1 input by the target input unit 13 as a search key, and the mole number data of the OH radicals read from the oxidative decomposition data table 31. Search for. Accordingly, the number of moles of OH radicals necessary for the oxidative decomposition of the constituent component as the search key is extracted.
Then, such processing is sequentially repeated. That is, the residue after the first component is mineralized becomes a target for the next oxidative decomposition, and the required number of moles of OH radicals is extracted for the component in accordance with the above, and thereafter such a process is repeated. (Of course, it is possible that the same component appears several times as an object of oxidative decomposition), and eventually everything is mineralized.
Next, in the total number-of-moles calculation means (part 2) 29, first, the number of moles of OH radicals extracted in the data search processing means 28 necessary for the oxidative decomposition of the organic compound of the target 1 is added. At the same time, the total number-of-moles calculation means (part 2) 29 converts the number of moles from the concentration (for example, mg / L) of the organic compound of the target 1 detected by the concentration detection means 12.
Based on these, the number of moles of OH radicals necessary for oxidative decomposition of the target 1 is first calculated.
After that, the addition amount calculation means (part 2) 30 calculates the addition amount of hydrogen peroxide and iron ions, but it conforms to the place described in the addition amount calculation means (part 1) 27 and so on. Description is omitted. Accordingly, the calculated addition amounts of hydrogen peroxide and iron ions are added.
In the control example (part 2), such control is performed.

《Action etc.》
The organic compound oxidative decomposition method of the present invention is configured as described above. Therefore, it becomes as follows.
(1) The to-be-treated water 8 in which the hardly decomposable organic compound of the object 1 is dissolved and contained is supplied from the raw water tank 3 to the Fenton treatment tank 4 (see FIG. 1). And the organic compound which consists of carbon, hydrogen, oxygen etc. is mineralized by the oxidative decomposition method of this invention.

  (2) The water to be treated 8 supplied to the Fenton treatment tank 4 is first added with the entire amount of the hydrogen peroxide solution in the hydrogen peroxide tank 6 from the hydrogen peroxide addition section 9 at the beginning of the reaction. Thereafter, the iron ion solution in the iron ion tank 7 is divided and added in a plurality of times from the iron ion addition unit 10. During this time, the water 8 to be treated is kept weakly acidic by pH adjusting means (not shown).

  (3) Now, OH radicals are generated for the water 8 to be treated in the Fenton treatment tank 4. That is, hydrogen peroxide is reduced by divalent iron ions added as a catalyst to generate OH radicals (see the Fenton main reaction (see the reaction formulas of Chemical Formulas 1, 2, and 3)), incidental, OH radicals are generated by secondary and chain reactions (see the reaction formulas of Chemical Formulas 4, 5, 6, 7, 8, 9, and 10).

(4) The OH radicals thus generated have extremely strong oxidizing power and decomposition power. Therefore, the organic compound of the target 1 dissolved and contained in the water 8 to be treated is completely mineralized by the OH radical into a low molecular compound such as water, carbon dioxide gas, oxygen molecule.
In the water 8 to be treated, the organic compound of the target 1 dissolved and contained in this way is mineralized and thus discharged to the outside.

(5) In the oxidative decomposition method of the present invention, the organic compound of the target 1 is oxidatively decomposed following the following steps (see FIGS. 4 and 5).
That is, the first step in the case of having a hydroxyl group, the second step in the case of having a hydrogen atom attached to a carbon atom or an oxygen atom, and then the third step in which the hydroxyl group is regenerated are sequentially repeated with the participation of OH radicals. .
The object 1 is mineralized by such an oxidative decomposition pattern. In addition, the reduction pattern of the 4th step by hydrogen in the nascent stage may be added.

(6) Now, in the present invention, the first, second, third, and fourth steps patterned in this way are commonly applied to the organic compound of the target 1, thereby oxidative decomposition process of each organic compound. , Chemical formula processes are clarified and understood individually and specifically.
Therefore, the total number of moles of OH radicals required for the oxidative decomposition of the target organic compound, and the amount of hydrogen peroxide and iron ions added by the Fenton method required to generate the OH radicals can be calculated easily and reliably. It becomes. In this way, a calculation algorithm such as the required total number of moles of OH radicals is established.

(7) In the present invention, by using the control device 11 such as the microcomputer 14, the calculation algorithm such as the required total number of moles of OH radicals is automated, controlled, and tooled.
That is, the concentration detection means 12 detects the concentration of the organic compound to be treated 1 in the water 8 to be treated, and the object input means 13 detects the constituent component of the organic compound and its number of moles (component equivalent). ), The required total number of moles of OH radicals and the amount of hydrogen peroxide and iron ions added can be calculated easily and reliably (see FIGS. 1 and 2).

(8) For example, by performing the first, second, third, and fourth step processes, the predetermined total mole number calculation process, and the addition amount calculation process in the microcomputer 14 based on the program, The number of moles and the added amount described above are calculated (see FIG. 3 and the like).
In addition, for example, the above-described mole number and addition amount can be calculated by performing a search process of data stored in advance, a predetermined total mole number calculation process, and an addition amount calculation process by the microcomputer 14 based on the program. (Refer to Table 1 and FIG. 3).

(9) It should be noted that the actual amount of OH radical used (required total number of moles) is larger than the theoretical reaction value (required theoretical total number of moles). That is, in practice, OH radicals are calculated, set, and prepared more frequently, with the number of moles calculated as the theoretical reaction value as the lower limit.
Therefore, the amount of hydrogen peroxide and iron ions added by the OH radical Fenton method is the same.

1 Target (organic compounds)
DESCRIPTION OF SYMBOLS 2 Processing apparatus 3 Raw water tank 4 Fenton processing tank 5 Post-processing tank 6 Hydrogen peroxide tank 7 Iron ion tank 8 Water to be treated 9 Hydrogen peroxide addition part 10 Iron ion addition part 11 Controller 12 Concentration detection means 13 Target input means 14 Microcomputer 15 Drive circuit 16 CPU
17 RAM
18 ROM
DESCRIPTION OF SYMBOLS 19 Memory | storage device 20 Input port 21 Output port 22 1st step processing means 23 2nd step processing means 24 3rd step processing means 25 4th step processing means 26 Total mole number calculating means (the 1)
27 Addition amount calculation means (1)
28 data search processing means 29 total number of moles calculation means (2)
30 Addition amount calculation means (2)
31 Oxidation decomposition data table

Claims (9)

A method of subjecting an organic compound consisting of at least two elements of carbon, hydrogen, or three elements added with oxygen to be treated, and subjecting the target in an aqueous solution to oxidative decomposition and mineralization with OH radicals (.OH) Because
The presence or absence of a hydroxyl group (—OH) is determined for the target. If yes, the OH radical deprives and oxidizes the hydroxyl atom of the hydroxyl group, and then returns to water and is released from the system. A first step of double-bonding oxygen atoms;
The presence or absence of a hydrogen atom (H) attached to a carbon atom or an oxygen atom is determined for the target, and if present, the OH radical deprives the hydrogen atom and oxidizes, and itself returns to water and is released outside the system. The second step;
With respect to the object, a third step in which a hydroxyl group is regenerated by adding a subsequent OH radical to an unpaired electron of a carbon atom or an unpaired electron of an oxygen atom generated in the second step;
And the first step and the second and third steps are repeated. In the oxidative decomposition method according to claim 1, when the target is depleted of hydrogen atoms and oxidized, the process proceeds to the next fourth step,
In the fourth step, first, the subsequent OH radicals oxidize by depriving hydrogen molecules from water molecules, and return themselves to water and liberate out of the system, while generating oxygen molecules, H ⁺ + e ⁻ )
A method of oxidative decomposition of an organic compound, characterized in that the nascent hydrogen reduces, hydrogenates the target from which hydrogen atoms have been depleted, and proceeds to the second step. The oxidative decomposition method according to claim 1, wherein the hydroxyl group in the first step includes a carboxyl group (-COOH),
In the case of the carboxyl group, an organic compound characterized in that, as the oxygen atom is double-bonded in the first step, valence electrons move, and carbon dioxide is generated and released outside the system. Oxidative decomposition method. 2. In the oxidative decomposition method according to claim 1, in the case of an aldehyde group having a hydrogen atom (—CHO), the OH radical in the subsequent third step is moved to the vacancy of the hydrogen atom deprived in the second step. With the addition, hydroxylation, and the subsequent double bonding of oxygen atoms in the first step, the valence electrons move, so that carbon dioxide is generated and released outside the system,
In the case of a methylene group having a hydrogen atom (—CH ₂ —), addition of an OH radical in the subsequent third step to the vacancy of the hydrogen atom deprived in the second step, hydroxylation, and further to the subsequent step Along with the double bonding of oxygen atoms in the first step, valence electrons move, so carbon dioxide is generated and released outside the system,
In the case of a methyl group having a hydrogen atom (CH _3- ), addition of an OH radical in the subsequent third step, hydroxylation to the vacancy of the hydrogen atom deprived in the second step, followed by the subsequent second step As oxygen atoms are double-bonded in one step, valence electrons move, and carbon dioxide and oxygen molecules are generated and released outside the system.
In the case of a carbonyl group (—C═O—), the valence electrons are added along with the addition of OH radicals and hydroxylation in the third step and the double bonding of oxygen atoms in the subsequent first step. Move, so carbon dioxide is generated and released outside the system,
In the case of an ether group (—O—), valence electrons move due to the addition of OH radicals and hydroxylation in the third step, followed by the double bond of oxygen atoms in the subsequent first step. A method for oxidative decomposition of an organic compound, characterized in that oxygen molecules are generated and liberated outside the system.   The oxidative decomposition method according to claim 1, 2, 3, or 4, wherein the required total number of moles of OH radicals required for the target oxidative decomposition is calculated based on the reaction formula in each step. A method for oxidative decomposition of organic compounds.   6. The oxidative decomposition method according to claim 5, wherein OH radicals are generated by the Fenton method, and the amount of hydrogen peroxide and divalent iron ions added is calculated based on the total number of moles of OH radicals and the Fenton method. And a method for oxidative decomposition of an organic compound. In the oxidative decomposition method according to claim 6, first, the concentration of the target is detected by the detection means, and the constituent components of the target and the number of moles thereof are input by the input means,
Thus, based on the detected concentration of the object and the components and moles entered, the controller causes the required total number of moles of OH radicals required for oxidative degradation of the object, and hydrogen peroxide and divalent The amount of iron ion added is calculated,
Then, based on an instruction from the control device, the hydrogen peroxide addition unit and the iron ion addition unit add the added amount of hydrogen peroxide and divalent iron ions to the target aqueous solution. A method for oxidative decomposition of an organic compound. In the oxidative decomposition method according to claim 7, the control device is configured by a computer, and according to the program,
A step process of calculating the number of moles of OH radicals required for each step by repeating the first, second, third and fourth steps;
Based on the step process, a calculation process of the required total number of moles of OH radicals required for the oxidative decomposition of the target, and a calculation process of the addition amount of hydrogen peroxide and divalent iron ions based on this are performed. An oxidative decomposition method of an organic compound. In the oxidative decomposition method according to claim 7, the control device is configured by a computer, and according to the program,
A data retrieval process for retrieving data stored in advance and extracting the number of moles of OH radicals necessary for oxidative decomposition of the target constituent;
A calculation process of the total number of moles of OH radicals required for the oxidative decomposition of the target based on the data search process, and a calculation process of the addition amount of hydrogen peroxide and divalent iron ions based on the calculation process are performed. A method for oxidative decomposition of an organic compound.

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