WO2011136196A1 - 過酸化物活性化剤ならびに土壌及び/又は地下水の浄化方法 - Google Patents
過酸化物活性化剤ならびに土壌及び/又は地下水の浄化方法 Download PDFInfo
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- WO2011136196A1 WO2011136196A1 PCT/JP2011/060102 JP2011060102W WO2011136196A1 WO 2011136196 A1 WO2011136196 A1 WO 2011136196A1 JP 2011060102 W JP2011060102 W JP 2011060102W WO 2011136196 A1 WO2011136196 A1 WO 2011136196A1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/40—Soil-conditioning materials or soil-stabilising materials containing mixtures of inorganic and organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/68—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water
- C02F1/683—Treatment of water, waste water, or sewage by addition of specified substances, e.g. trace elements, for ameliorating potable water by addition of complex-forming compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/06—Contaminated groundwater or leachate
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
Definitions
- the present invention relates to an organic substance adsorbent used in combination with a peroxide used when purifying soil and / or groundwater contaminated with an organic compound, an activator of the peroxide containing an iron complex, and the use thereof.
- a peroxide used when purifying soil and / or groundwater contaminated with an organic compound
- an activator of the peroxide containing an iron complex and the use thereof.
- the organic compounds mentioned here are mainly TPH (Total Petroleum hydrocarbons such as Petroleum Hydrocarbon), persistent materials that are difficult to be decomposed by living organisms, agricultural chemicals, preservatives, cyanides, and the like.
- Chemical purification methods that can be carried out in a neutral pH range include a purification method using a Fenton reaction using an aqueous iron chelate solution and a hydrogen peroxide solution (see Patent Document 1), and a biodegradable chelating agent and an excess solution.
- a purification method by a Fenton reaction using an aqueous hydrogen oxide solution is known.
- a purification method using a Fenton reaction using a hydrogen peroxide, citric acid, and iron mixed solution is known.
- all the methods described in these documents are aqueous reactions, and it is difficult to decompose water-insoluble substances such as petroleum hydrocarbons.
- Non-Patent Documents 1 to 3 As an in-situ purification technique in the neutral region of petroleum hydrocarbons, a cleaning method using a surfactant (Non-Patent Documents 1 to 3) has been tried, but these methods are all cleaning. There were drawbacks that required reprocessing of the recovered oil contamination.
- the object of the present invention is to solve the above-mentioned problems in the prior art, and to provide a method for simply, efficiently and inexpensively purifying soil and / or groundwater contaminated with organic compounds, particularly petroleum hydrocarbons. There is.
- the present inventors have decomposed petroleum hydrocarbons even in a neutral pH range by using an organic matter adsorbent containing diatomaceous earth, an iron complex, and a peroxide. The inventors have found that this is possible and have completed the present invention.
- a peroxide activator that activates peroxide used to purify soil and / or groundwater contaminated with organic compounds, and contains an organic substance adsorbent containing diatomaceous earth and an iron complex. It is a featured peroxide activator.
- the iron complex is glycol ether diamine tetraacetic acid, nitrilotris (methylenephosphonic acid), L-aspartic acid diacetic acid, taurine diacetic acid, hydroxyethyliminodiacetic acid, hydroxyethylidene diphosphonic acid, 1,3-diamino One or more selected from -2-hydroxypropanetetraacetic acid, phytic acid, methylglycine diacetic acid, hydroxyethylethylenediaminetriacetic acid, L-glutamic acid diacetic acid, phosphonobutanetricarboxylic acid and (S, S) -ethylenediamine disuccinic acid
- ⁇ 3> The peroxide activator according to ⁇ 1> or ⁇ 2> above and a peroxide are added simultaneously or sequentially to soil and / or groundwater contaminated with an organic compound, Soil and / or groundwater purification method.
- ⁇ 4> The purification method according to ⁇ 3>, wherein the peroxide is at least one selected from compounds that generate hydrogen peroxide in an aqueous solution.
- ⁇ 5> The purification method according to ⁇ 4>, wherein the peroxide is at least one selected from hydrogen peroxide, percarbonate, urea peroxide, peroxodisulfate, and peroxomonosulfate.
- ⁇ 6> The purification method according to ⁇ 5>, wherein the peroxide is hydrogen peroxide or peroxodisulfate.
- ⁇ 7> The purification method according to any one of ⁇ 3> to ⁇ 6>, wherein a pH of a reaction field between the peroxide and the organic compound is 5 to 9.
- the peroxide activator according to any one of ⁇ 1> or ⁇ 2> is added to soil and / or groundwater contaminated with an organic compound, and the organic compound is added to the peroxide activator.
- the method of purifying soil and / or groundwater comprising the step of adsorbing to the organic matter adsorbent in the step, and then the step of decomposing the organic compound by adding peroxide.
- the present invention by using an organic substance adsorbent containing diatomaceous earth, an iron complex, and a peroxide, it is possible to purify soil and / or groundwater containing petroleum hydrocarbons in a neutral pH region. Furthermore, since the mixed solution of the organic substance adsorbent and the iron complex in the present invention is sufficiently stable, the preparation of the solution in advance can greatly reduce the labor for preparing the drug at the site. .
- the organic compound in the present invention mainly includes petroleum hydrocarbons such as TPH (Total Petroleum Hydrocarbon), hardly decomposable substances that are difficult to be decomposed by living organisms, agricultural chemicals, preservatives, cyanides, and the like.
- the soil and / or groundwater to be purified in the present invention is mainly contaminated with petroleum hydrocarbons such as TPH.
- chemicals such as persistent organic compounds that are difficult to be decomposed by living organisms, agricultural chemicals, preservatives, organochlorine compounds such as trichlorethylene (TCE) and tetrachloroethylene (PCE), cyanides, etc. Soil and / or groundwater contaminated with substances can also be treated.
- the organic adsorbent used in the present invention is not particularly limited as long as it contains diatomaceous earth, and may be any porous substance having an organic substance adsorbing ability, but does not substantially decompose peroxides, particularly hydrogen peroxide. It is preferable.
- an organic substance adsorbent having a high peroxide resolution is used, the coexisting iron complex may be reduced, but in many cases, wasteful decomposition of the peroxide increases, resulting in poor economic efficiency.
- an organic substance adsorbent that does not substantially decompose peroxide is used, particularly when the present invention is used for in-situ purification, the diffusion distance of the injected peroxide becomes long. The number of drilling can be reduced and it is very useful industrially.
- diatomaceous earth is industrially advantageous in terms of price and availability.
- diatomaceous earth is a siliceous deposit composed of the remains of diatom, which is a single-cell sow, and is defined as a mixture of clay, volcanic ash, organic matter and the like (Kyoritsu Shuppan Kagaku Daigaku Dictionary 3).
- diatomaceous earth used for this invention Both an unbaked product and a baked product can be used. Similarly, both unpurified products and purified products can be used.
- particle size the smaller the particle size, the larger the organic matter adsorption product and the better the fluidity in the case of an aqueous dispersion.
- the BET specific surface area of diatomaceous earth in the present invention is preferably 15 to 45 m 2 / g. More preferably, it is in the range of 20 to 40 m 2 / g. If it is out of the range of 15 to 45 m 2 / g, the decomposition amount of the organic compound becomes small, which is not preferable.
- the compounding amount of the organic substance adsorbent depends on the concentration of contamination in the soil and / or groundwater contaminated with the organic compound, and blends more than the amount capable of adsorbing the total amount of the organic compound present in the reaction field. Is preferred.
- the specific blending amount can be determined by using a treatability test using soil and groundwater at the site as an index of whether or not purification is possible. In this treatability test, if there is a shortage of organic adsorbent, the oil film may be visually confirmed after the test, and it may be found that the blending amount is insufficient without determining whether or not purification is possible by analysis.
- limiting in particular in the iron salt used for the said iron complex For example, ferrous sulfate, ferrous chloride, etc. are mentioned, However, Ferrous sulfate is suitable from availability.
- the chelating agent used for the iron complex is not particularly limited, but preferably glycol ether diamine tetraacetic acid (referred to as GEDTA), nitrilotris (methylene phosphonic acid) (referred to as NTMP), L-aspartic acid.
- GEDTA glycol ether diamine tetraacetic acid
- NTMP nitrilotris (methylene phosphonic acid)
- L-aspartic acid is not particularly limited, but preferably glycol ether diamine tetraacetic acid (referred to as GEDTA), nitrilotris (methylene phosphonic acid) (referred to as NTMP), L-aspartic acid.
- Diacetic acid (referred to as ASDA), taurine diacetic acid (referred to as ESDA), hydroxyethyliminodiacetic acid (referred to as HIDA), hydroxyethylidene diphosphonic acid (referred to as HEDP), 1,3 -Diamino-2-hydroxypropanetetraacetic acid (referred to as DPTA-OH), phytic acid, methylglycine diacetic acid (referred to as MGDA), hydroxyethylethylenediaminetriacetic acid (referred to as HEDTA), L-glutamic acid Diacetic acid (referred to as GLDA), phosphonobutanetricarboxylic acid (referred to as PBTC) ) And (S, S) - which is one or more chelating agents selected from ethylenediamine disuccinic acid (referred to as EDDS).
- ASDA taurine diacetic acid
- HIDA hydroxyethyliminodiacetic acid
- HEDP hydroxyethylidene diphosphonic
- These chelating agents can be used in either acid type or base type, but it is preferable to use an iron complex before use.
- the compounding amount of the iron complex depends on the concentration of contamination in the soil and / or groundwater contaminated with the organic compound, but it is preferable to compound 15 mg / L or more in terms of iron ion equivalent in the reaction field.
- the compounding ratio of the iron salt and the chelating agent in the iron complex of the present invention is not particularly limited as long as the effect of the present invention is not impaired, but the molar ratio of the chelating agent to the iron salt (as iron ion)
- the (chelating agent / iron ion) is preferably 1 to 3, more preferably 1 to 2. Too much chelating agent is not economical, and if the molar ratio is too small, precipitation of iron salt is not preferable.
- an aqueous solution obtained by mixing an organic adsorbent containing diatomaceous earth and an iron complex, an aqueous solution containing an organic adsorbent containing diatomaceous earth and an iron complex, respectively It is possible to take various forms depending on the use conditions, such as a form in which the solid adsorbent is solid and the iron complex is an aqueous solution. In view of ease of operation, the form of an aqueous solution is particularly preferable.
- the peroxide used in the present invention is not particularly limited, but hydrogen peroxide, peroxodisulfuric acid, and peroxomonosulfuric acid are preferably used.
- An aqueous hydrogen peroxide solution is preferred because of its price and stability of the aqueous solution.
- a stabilizer such as metaphosphoric acid, pyrophosphoric acid, orthophosphoric acid, condensed phosphate, phosphonic acid, picolinic acid, dipicolinic acid, and phenylurea is within a range that does not impair the effects of the present invention. It is also possible to add.
- As the hydrogen peroxide an industrial hydrogen peroxide solution can be used.
- the concentration of the aqueous hydrogen peroxide solution is not particularly limited, but is preferably 60% by weight or less because it is difficult to obtain a hydrogen peroxide aqueous solution having a concentration higher than 60% by weight. More preferably, it is 25 to 45% by weight, particularly preferably 30 to 45% by weight from the viewpoint of safety and transportation cost.
- the peroxide activator and the peroxide may be supplied separately, or may be supplied simultaneously after mixing.
- the supply method is not particularly limited, and can be applied to all methods such as injection, press-fitting, high-pressure injection, high-pressure injection agitation, spraying, and chemical injection into a pumped water aeration system. It is also possible to heat the aqueous solution containing each material before adding it to the purification object, and to heat the purification object after adding the aqueous solution containing each material.
- the amount of peroxide supplied to the object to be purified is about 1 to 1000 times the amount necessary for decomposition of pollutants. If it is less than this, purification will be insufficient, and if it is too much, it will be inferior in economic efficiency.
- the preferred amount of the peroxide activator to be used is preferably determined by a prior treatability test, but at least the amount of the organic adsorbent that can adsorb the entire amount of the organic compound to be purified must be used. When the amount used is small, the organic compound may not be supplied to the aqueous reaction field and decomposition may be incomplete. If too much is used, it is inferior in economic efficiency.
- a pH buffer what is introduced by the chemical handbook etc. may be sufficient, but a carbonate type buffer is preferable from a viewpoint of iron precipitation suppression or environmental harmony.
- the carbonate buffer include sodium carbonate, potassium carbonate, calcium carbonate, magnesium carbonate, sodium bicarbonate, potassium bicarbonate and the like.
- the pH buffering agent may be added so that the pH of soil and / or groundwater during purification is 5 to 9, but it is desirable to refrain from using it as much as possible because carbonate ions and bicarbonate ions have a radical scavenger effect. .
- one method includes a peroxide activator and a peroxide. May be added simultaneously or sequentially to soil and / or groundwater contaminated with organic compounds.
- a step of adding a peroxide activator to soil and / or groundwater contaminated with an organic compound, and adsorbing the organic compound in the soil and / or groundwater to an organic matter adsorbent containing diatomaceous earth Next, there is a method having a step of decomposing the organic compound by adding a peroxide.
- Still another method includes a method of adding an organic substance adsorbent containing diatomaceous earth to the ground to adsorb the organic compound, then adding a hydrogen peroxide aqueous solution, and further adding an iron complex. It is done.
- adsorbing the organic compound to the organic adsorbent a low water-soluble petroleum hydrocarbon such as TPH is introduced into the aqueous reaction field, and then a hydroxyl radical is removed by adding an aqueous hydrogen peroxide solution and an iron complex purifier. It is preferable because it can be generated and organic substances can be decomposed.
- Example 1 (1) A 100 mL pressure screw cap bottle was used as a reaction vessel. (2) As an organic substance adsorbent, a solution containing 2.7% by weight of diatomaceous earth (Keiso soil reagent Lot.G1D3004 manufactured by Kosou Kagaku Yakuhin Kogyo Co., Ltd.) and an iron complex was used as a peroxide activator. The BET specific surface area of the diatomaceous earth made by Kosomaku Pharmaceutical Co., Ltd. was 38.1 m 2 / g.
- the iron complex uses glycol ether diamine tetraacetic acid (GEDTA, “Cyrest GEA” manufactured by Kyrest Co.) as a chelating agent, and FeSO 4 ⁇ 7H 2 O (special grade reagent manufactured by Wako Pure Chemical Industries) as an iron salt.
- GEDTA glycol ether diamine tetraacetic acid
- FeSO 4 ⁇ 7H 2 O special grade reagent manufactured by Wako Pure Chemical Industries
- the molar ratio of iron ions was adjusted to 1 and the iron ion concentration was adjusted to 1500 mg / L.
- a 440 mM sodium bicarbonate / 0.875 mM sodium carbonate aqueous solution was used as a pH buffer.
- Commercial kerosene was used as an object to be decomposed.
- Example 2 As a result of performing a test in the same manner as in Example 1 except that nitrilotris (methylenephosphonic acid) (NTMP, “Cyrest PH-320” manufactured by Crest Co., Ltd.) was used as a chelating agent, the kerosene decomposition rate was 71.9%. It was. (Example 3) As a result of performing the test in the same manner as in Example 1 except that L-aspartic acid diacetic acid (ASDA, manufactured by Mitsubishi Rayon Co., Ltd.) was used as a chelating agent, the kerosene decomposition rate was 71.0%.
- NTMP nitrilotris (methylenephosphonic acid)
- NTMP nitrilotris (methylenephosphonic acid)
- ASDA L-aspartic acid diacetic acid
- Example 4 As a result of performing the test in the same manner as in Example 1 except that taurine diacetate (ESDA, “Cyrest ESDA-30” manufactured by Crest Co., Ltd.) was used as a chelating agent, the kerosene decomposition rate was 70.1%.
- Example 5 As a result of performing the test in the same manner as in Example 1 except that hydroxyethyliminodiacetic acid (HIDA, “Cyrest E-20” manufactured by CHIRES Co., Ltd.) was used as a chelating agent, the kerosene decomposition rate was 67.6%.
- HIDA hydroxyethyliminodiacetic acid
- Example 6 As a result of performing the test in the same manner as in Example 1 except that hydroxyethylidene diphosphonic acid (HEDP, “Cyrest PH-212” manufactured by CHIRES Co., Ltd.) was used as a chelating agent, the kerosene decomposition rate was 66.6%.
- Example 7 As a result of performing the test in the same manner as in Example 1 except that 1,3-diamino-2-hydroxypropanetetraacetic acid (DPTA-OH, “Cyrest RA” manufactured by Kyrest Co.) was used as a chelating agent, the kerosene decomposition rate was 65 0.0%.
- DPTA-OH 1,3-diamino-2-hydroxypropanetetraacetic acid
- Example 8 As a result of performing a test in the same manner as in Example 1 except that phytic acid (a reagent manufactured by Tokyo Chemical Industry Co., Ltd.) was used as a chelating agent, the kerosene decomposition rate was 63.4%.
- Example 9 As a result of performing the test in the same manner as in Example 1 except that methylglycine diacetate (MGDA, “TRILON M” manufactured by BASF Corporation) was used as the chelating agent, the kerosene decomposition rate was 56.5%.
- MGDA methylglycine diacetate
- Example 10 As a result of performing the test in the same manner as in Example 1 except that hydroxyethylethylenediaminetriacetic acid (HEDTA, “Cyrest HA” manufactured by Chillest Co., Ltd.) was used as the chelating agent, the kerosene decomposition rate was 56.1%.
- Example 11 As a result of conducting the test in the same manner as in Example 1 except that L-glutamic acid diacetic acid (GLDA, “Cyrest CMG-40” manufactured by Kyrest Co.) was used as a chelating agent, the kerosene decomposition rate was 55.3%.
- HEDTA hydroxyethylethylenediaminetriacetic acid
- GLDA L-glutamic acid diacetic acid
- Example 12 As a result of conducting the test in the same manner as in Example 1 except that phosphonobutanetricarboxylic acid (PBTC, “Cyrest PH-430” manufactured by Crest Co.) was used as the chelating agent, the kerosene decomposition rate was 52.5%.
- Example 13 As a result of performing the test in the same manner as in Example 1 except that (S, S) -ethylenediamine disuccinic acid (EDDS, “Cyrest EDDS-35” manufactured by CHIRES Co., Ltd.) was used as the chelating agent, the kerosene decomposition rate was 52.5. %Met.
- Example 14 Tested in the same manner as in Example 1 except that the concentration of diatomaceous earth was 5.3% by weight in Example 1 (2) and hydroxyethylethylenediaminetriacetic acid (HEDTA, “Cyrest HA” manufactured by Crest Co.) was used as the chelating agent. As a result, the kerosene decomposition rate was 56.3%.
- Example 15 The test was performed in the same manner as in Example 1 except that the iron ion concentration was 500 mg / L in Example 2 (2) and hydroxyethylethylenediaminetriacetic acid (HEDTA, “Cyrest HA” manufactured by Crest Co.) was used as the chelating agent.
- Example 16 The test was conducted in the same manner as in Example 1 except that the iron ion concentration was 3000 mg / L in Example 1 (2), and hydroxyethylethylenediaminetriacetic acid (HEDTA, “Cyrest HA” manufactured by Kyrest Co., Ltd.) was used as the chelating agent. As a result, the kerosene decomposition rate was 54.7%.
- HEDTA hydroxyethylethylenediaminetriacetic acid
- Example 17 In Example 1 (2), Example 1 except that Isolite Industry's diatomaceous earth Isolite DP was used as the organic substance adsorbent, and Hydroxyethylethylenediaminetriacetic acid (HEDTA, “Cyrest HA” manufactured by Kirest Corporation) was used as the chelating agent. As a result of conducting the test in the same manner as above, the kerosene decomposition rate was 67.0%. The BET specific surface area of Isolite DP manufactured by Isolite Industry was 24.5 m 2 / g. (Example 18) In Example 1 (2), except that diatomite radiolite SPF manufactured by Showa Chemical Industry Co., Ltd.
- hydroxyethylethylenediaminetriacetic acid HEDTA, “Chillest HA” manufactured by Kyrest Co., Ltd.
- HEDTA hydroxyethylethylenediaminetriacetic acid
- the kerosene decomposition rate was 70.1%.
- the BET specific surface area of Radiolite SPF manufactured by Showa Chemical Industry was 31.8 m 2 / g.
- Example 1 (Comparative Example 1)
- an activated carbon aqueous dispersion (“Dia Fresh Olson AT” manufactured by Mitsubishi Gas Chemical Co., Ltd.) was used as the organic adsorbent, and hydroxyethylethylenediaminetriacetic acid (HEDTA, “Cyrest HA” manufactured by Crest, Inc.) as the chelating agent. ) was used in the same manner as in Example 1 and the kerosene decomposition rate was 33.5%.
- HEDTA hydroxyethylethylenediaminetriacetic acid
- Example 1 (2) was the same as Example 1 except that molecular sieve 3A was pulverized and used as the organic substance adsorbent, and hydroxyethylethylenediaminetriacetic acid (HEDTA, “Cyrest HA” manufactured by Crest Co.) was used as the chelating agent. As a result, the kerosene decomposition rate was 10.0%.
- Comparative Example 3 As a result of performing the test in the same manner as in Example 1 except that a solution containing no iron complex was used as the peroxide activator in (2) of Example 1, the kerosene decomposition rate was 46.0%. .
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Abstract
Description
Petroleum Hydrocarbon)のような石油系炭化水素や、生物による分解が困難な難分解性物質、農薬、防腐剤、シアン化物等が該当する。
<1> 有機化合物に汚染された土壌及び/又は地下水の浄化に用いる過酸化物を活性する過酸化物活性化剤であって、珪藻土を含む有機物吸着材と、鉄錯体とを含有することを特徴とする過酸化物活性化剤である。
<2> 前記鉄錯体が、グリコールエーテルジアミン四酢酸、ニトリロトリス(メチレンホスホン酸)、L-アスパラギン酸二酢酸、タウリン二酢酸、ヒドロキシエチルイミノ二酢酸、ヒドロキシエチリデンジホスホン酸、1,3-ジアミノ-2-ヒドロキシプロパン四酢酸、フィチン酸、メチルグリシン二酢酸、ヒドロキシエチルエチレンジアミン三酢酸、L-グルタミン酸二酢酸、ホスホノブタントリカルボン酸及び(S,S)-エチレンジアミンジコハク酸から選ばれる一種以上のキレート剤で形成されていることを特徴とする上記<1>に記載の過酸化物活性化剤である。
<3> 上記<1>または<2>に記載の過酸化物活性化剤と過酸化物とを同時に、あるいは逐次に、有機化合物で汚染された土壌及び/又は地下水に添加することを特徴とする土壌及び/又は地下水の浄化方法である。
<4> 前記過酸化物が、水溶液中で過酸化水素を発生する化合物から選ばれる1種以上である上記<3>に記載の浄化方法である。
<5> 前記過酸化物が、過酸化水素、過炭酸塩、過酸化尿素、ペルオキソ二硫酸塩及びペルオキソ一硫酸塩から選ばれる1種以上である上記<4>に記載の浄化方法である。
<6> 前記過酸化物が過酸化水素またはペルオキソ二硫酸塩である上記<5>に記載の浄化方法である。
<7> 前記過酸化物と前記有機化合物との反応場のpHが5~9である上記<3>~<6>のいずれかに記載の浄化方法である。
<8> 上記<1>または<2>のいずれかに記載の過酸化物活性化剤を有機化合物で汚染された土壌及び/又は地下水に添加し、前記有機化合物を前記過酸化物活性化剤における有機物吸着材に吸着させる工程、次いで過酸化物を添加して前記有機化合物を分解する工程を有する土壌及び/又は地下水の浄化方法である。
<9> 前記過酸化物と前記有機化合物との反応場のpHが5~9である上記<8>に記載の浄化方法である。
<10> 珪藻土を含む有機物吸着材を、有機化合物で汚染された土壌及び/又は地下水に添加して、前記有機化合物を前記有機物吸着材に吸着させる工程、次いで過酸化物を添加する工程、次いで鉄錯体溶液を添加する工程を有することを特徴とする土壌及び/又は地下水の浄化方法である。
<11> 前記過酸化物と前記有機化合物との反応場のpHが5~9である上記<10>に記載の浄化方法である。
上記鉄錯体に用いられる鉄塩には特に制限はなく、例えば硫酸第一鉄や塩化第一鉄等が挙げられるが、入手の容易さから硫酸第一鉄が好適である。
好ましい過酸化物活性化剤の使用量は、事前のトリータビリティー試験より求めることが好ましいが、少なくとも浄化対象の有機化合物を全量吸着出来る量以上の有機物吸着材の使用は必要である。使用量が少ない場合は、有機化合物が水系反応場へ供給されず分解が不完全となる恐れがある。使用量が多すぎる場合は経済性に劣る。
<BET比表面積の測定方法>
下記の実施例及び比較例で用いた珪藻土のBET比表面積は、日本ベル社製 BELSORP miniIIを用いて測定した。なお、各珪藻土は日本ベル社製 BELSORP-vacIIにより300℃/3時間の前処理を行った後に、BET比表面積を測定した。
(1)100mL耐圧ネジ口瓶を反応容器として用いた。
(2)有機物吸着材として珪藻土(小宗科学薬品工業株式会社製 けいそう土試薬 Lot.G1D3004)2.7重量%、及び鉄錯体を含む溶液を過酸化物活性化剤として用いた。この小宗科学薬品工業製けいそう土のBET比表面積は38.1m2/gであった。なお、鉄錯体は、キレート剤としてグリコールエーテルジアミン四酢酸(GEDTA、キレスト社製「キレストGEA」)、鉄塩としてFeSO4・7H2O(和光純薬製特級試薬)を用いて、キレート剤/鉄イオンのモル比が1、かつ鉄イオン濃度が1500mg/Lとなるように調整した。
(3)pH緩衝剤として440mM炭酸水素ナトリウム/0.875mM炭酸ナトリウム水溶液を用いた。
(4)分解対象として市販の灯油を用いた。
(5)94mLの超純水を反応容器に入れ、次いで前記(2)の過酸化物活性化剤1mL、前記(3)のpH緩衝剤4mLを添加した。さらに1.5重量%の過酸化水素水溶液1mLを加えた。
(6)前記(4)の灯油を12μL添加した後、直ちに密栓した。
(7)TAITEC社製ストロングシェーカーSR-2Sに密栓した反応器を固定し、300回振盪/分にて22℃で20時間振盪させた。
(8)所定時間経過後開封し、灯油抽出用としてn-ヘキサン10mLを添加し、再び密栓した。
(9)前記(7)の振盪機にて30分振盪し、次いで30分静置した。
(10)無水硫酸ナトリウムを入れた2mLオートサンプラー用バイアルにヘキサン層を分取し、GC-FID分析に供した。
(11)灯油の定量方法はEPA(アメリカ環境保護局)8015Bに従い行った。
(12)前記(5)において前記(2)の過酸化物活性化剤1mLを100mLの超純水に添加したものを調製し、前記(6)以降の操作を行ったものをリファレンスとした。
(13)灯油の分解率は下記式により求めた。
なお、有機物吸着材より回収される灯油の回収率は、回収される量によらず一定とした。上記試験の結果、灯油分解率は79.9%であった。
キレート剤としてニトリロトリス(メチレンホスホン酸)(NTMP、キレスト社製「キレストPH-320」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は71.9%であった。
(実施例3)
キレート剤としてL-アスパラギン酸二酢酸(ASDA、三菱レイヨン社製)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は71.0%であった。
(実施例4)
キレート剤としてタウリン二酢酸(ESDA、キレスト社製「キレストESDA-30」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は70.1%であった。
(実施例5)
キレート剤としてヒドロキシエチルイミノ二酢酸(HIDA、キレスト社製「キレストE-20」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は67.6%であった。
キレート剤としてヒドロキシエチリデンジホスホン酸(HEDP、キレスト社製「キレストPH-212」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は66.6%であった。
(実施例7)
キレート剤として1,3-ジアミノ-2-ヒドロキシプロパン四酢酸(DPTA-OH、キレスト社製「キレストRA」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は65.0%であった。
(実施例8)
キレート剤としてフィチン酸(東京化成工業社製試薬)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は63.4%であった。
(実施例9)
キレート剤としてメチルグリシン二酢酸(MGDA、BASF社製「TRILON M」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は56.5%であった。
キレート剤としてヒドロキシエチルエチレンジアミン三酢酸(HEDTA、キレスト社製「キレストHA」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は56.1%であった。
(実施例11)
キレート剤としてL-グルタミン酸二酢酸(GLDA、キレスト社製「キレストCMG-40」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は55.3%であった。
(実施例12)
キレート剤としてホスホノブタントリカルボン酸(PBTC、キレスト社製「キレストPH-430」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は52.5%であった。
(実施例13)
キレート剤として(S,S)-エチレンジアミンジコハク酸(EDDS、キレスト社製「キレストEDDS-35」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は52.5%であった。
実施例1の(2)において珪藻土の濃度を5.3重量%とし、キレート剤としてヒドロキシエチルエチレンジアミン三酢酸(HEDTA、キレスト社製「キレストHA」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は56.3%であった。
(実施例15)
実施例1の(2)において鉄イオン濃度を500mg/Lとし、キレート剤としてヒドロキシエチルエチレンジアミン三酢酸(HEDTA、キレスト社製「キレストHA」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は58.2%であった。
(実施例16)
実施例1の(2)において鉄イオン濃度を3000mg/Lとし、キレート剤としてヒドロキシエチルエチレンジアミン三酢酸(HEDTA、キレスト社製「キレストHA」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は54.7%であった。
(実施例17)
実施例1の(2)において、有機物吸着材としてイソライト工業社製珪藻土 イソライトDPを用い、キレート剤としてヒドロキシエチルエチレンジアミン三酢酸(HEDTA、キレスト社製「キレストHA」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は67.0%であった。このイソライト工業製イソライトDPのBET比表面積は24.5m2/gであった。
(実施例18)
実施例1の(2)において、有機物吸着材として昭和化学工業社製珪藻土 ラヂオライトSPFを用い、キレート剤としてヒドロキシエチルエチレンジアミン三酢酸(HEDTA、キレスト社製「キレストHA」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は70.1%であった。この昭和化学工業製ラヂオライトSPFのBET比表面積は31.8m2/gであった。
実施例1の(2)において活性炭水性分散液(三菱ガス化学社製「ダイヤフレッシュ オルソンAT」)を有機物吸着材として用い、キレート剤としてヒドロキシエチルエチレンジアミン三酢酸(HEDTA、キレスト社製「キレストHA」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は33.5%であった。
(比較例2)
実施例1の(2)において有機物吸着材としてモレキュラーシーブス3Aを粉砕して用い、キレート剤としてヒドロキシエチルエチレンジアミン三酢酸(HEDTA、キレスト社製「キレストHA」)を用いた以外は実施例1と同様に試験を行った結果、灯油分解率は10.0%であった。
(比較例3)
実施例1の(2)において、鉄錯体を含まない溶液を過酸化物活性化剤として用いた以外は実施例1と同様に試験を行った結果、灯油分解率は46.0%であった。
Claims (11)
- 有機化合物に汚染された土壌及び/又は地下水の浄化に用いる過酸化物を活性する過酸化物活性化剤であって、珪藻土を含む有機物吸着材と、鉄錯体とを含有することを特徴とする過酸化物活性化剤。
- 前記鉄錯体が、グリコールエーテルジアミン四酢酸、ニトリロトリス(メチレンホスホン酸)、L-アスパラギン酸二酢酸、タウリン二酢酸、ヒドロキシエチルイミノ二酢酸、ヒドロキシエチリデンジホスホン酸、1,3-ジアミノ-2-ヒドロキシプロパン四酢酸、フィチン酸、メチルグリシン二酢酸、ヒドロキシエチルエチレンジアミン三酢酸、L-グルタミン酸二酢酸、ホスホノブタントリカルボン酸及び(S,S)-エチレンジアミンジコハク酸から選ばれる一種以上のキレート剤で形成されていることを特徴とする請求項1に記載の過酸化物活性化剤。
- 請求項1または2に記載の過酸化物活性化剤と過酸化物とを同時に、あるいは逐次に、有機化合物で汚染された土壌及び/又は地下水に添加することを特徴とする土壌及び/又は地下水の浄化方法。
- 前記過酸化物が、水溶液中で過酸化水素を発生する化合物から選ばれる1種以上である請求項3に記載の浄化方法。
- 前記過酸化物が、過酸化水素、過炭酸塩、過酸化尿素、ペルオキソ二硫酸塩及びペルオキソ一硫酸塩から選ばれる1種以上である請求項4に記載の浄化方法。
- 前記過酸化物が過酸化水素またはペルオキソ二硫酸塩である請求項5に記載の浄化方法。
- 前記過酸化物と前記有機化合物との反応場のpHが5~9である請求項3~6のいずれかに記載の浄化方法。
- 請求項1または2に記載の過酸化物活性化剤を有機化合物で汚染された土壌及び/又は地下水に添加し、前記有機化合物を前記過酸化物活性化剤における有機物吸着材に吸着させる工程、次いで過酸化物を添加して前記有機化合物を分解する工程を有する土壌及び/又は地下水の浄化方法。
- 前記過酸化物と前記有機化合物との反応場のpHが5~9である請求項8に記載の浄化方法。
- 珪藻土を含む有機物吸着材を、有機化合物で汚染された土壌及び/又は地下水に添加して、前記有機化合物を前記有機物吸着材に吸着させる工程、次いで過酸化物を添加する工程、次いで鉄錯体溶液を添加する工程を有することを特徴とする土壌及び/又は地下水の浄化方法。
- 前記過酸化物と前記有機化合物との反応場のpHが5~9である請求項10に記載の浄化方法。
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JP5846117B2 (ja) | 2016-01-20 |
JPWO2011136196A1 (ja) | 2013-07-18 |
TWI551551B (zh) | 2016-10-01 |
CN102869743A (zh) | 2013-01-09 |
KR20130083379A (ko) | 2013-07-22 |
CN102869743B (zh) | 2015-03-18 |
TW201144237A (en) | 2011-12-16 |
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