JP6493728B2 - Treatment method of contaminated soil - Google Patents

Treatment method of contaminated soil Download PDF

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JP6493728B2
JP6493728B2 JP2014194423A JP2014194423A JP6493728B2 JP 6493728 B2 JP6493728 B2 JP 6493728B2 JP 2014194423 A JP2014194423 A JP 2014194423A JP 2014194423 A JP2014194423 A JP 2014194423A JP 6493728 B2 JP6493728 B2 JP 6493728B2
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soil
contaminated soil
washing
chelating agent
agent
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JP2016064354A (en
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長谷川 浩
浩 長谷川
光 澤井
光 澤井
義則 塚越
義則 塚越
石渡 寛之
寛之 石渡
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国立大学法人金沢大学
西松建設株式会社
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Description

  The present invention relates to a method for purifying soil contaminated with artificial and natural harmful metals.

Since the enforcement of the Soil Contamination Countermeasures Law in 2003, the number of reports of contaminated soil has been increasing, and development of environmental remediation technology for contaminated soil that adversely affects human health and the living environment is required.
The Soil Contamination Countermeasures Law sets out standards for the amount of toxic substances released and content standards.
The elution amount standard assumes an amount that can be eluted from soil by contact with rainwater or groundwater in the natural environment.
The content standard determines the risk of dissolution in the stomach when heavy metals are ingested directly.

Patent Document 1 discloses a technique in which an oxidizing agent is first added to soil and an organic substance of a heavy metal-organic compound complex is oxidized to cause a heavy metal fixing agent to directly act on the heavy metal after decomposing the complex.
However, leaving the heavy metal in the soil as it is in the soil without reducing it has problems of stability and stability period and remains uneasy.
Patent Document 2 discloses a technique for washing soil contaminated with heavy metals with a chelating agent made of alkali metal gluconate.
However, cleaning with a chelating agent has an effect of reducing the content of harmful metals in the soil, and although it is useful, it is difficult to completely remove it.
In our experimental study, although the content of toxic metals can be reduced by washing with a chelating agent, the leaching amount test has a problem that the leaching amount of toxic metals increases due to the influence of chelating agents remaining in the soil. It was.
Therefore, the present inventors have studied to reduce the content of harmful metals in the soil and to reduce the amount of elution in the elution amount test, and as a result, have reached the present invention.

JP 2001-191063 A JP 2014-117688 A

  An object of this invention is to provide the cheap and reliable processing method of contaminated soil.

The method for treating contaminated soil according to the present invention includes a step of washing the contaminated soil with a cleaning solution to which a chelating agent is added, and a step of bringing the washed contaminated soil into contact with an immobilizing treatment agent. It is characterized by the reduction of the amount of harmful metal elution with respect to.
As a chelating agent used for soil washing in the present invention, ethylenediaminetetraacetic acid (EDTA), iminodiacetic acid (IDA), nitrilotriacetic acid (NTA), diethylenetriaminepentaacetic acid (DTPA), cyclohexanediaminetetraacetic acid (CyDTA), and the following Biodegradable 3-hydroxy-2,2′-iminodisuccinic acid (HIDS), ethylenediamine disuccinic acid (EDDS), L-glutamic acid-N, N-diacetic acid (GLDA), methylglycine diacetate ( MGDA) or the like can be used.

In the present invention, the immobilization treatment agent means an agent that has the effect of making the harmful metals lead, arsenic, cadmium, hexavalent chromium, selenium, alkyl mercury, etc. insoluble.
For example, poorly soluble chelating agents, adsorbents, inorganic flocculants and the like can be mentioned as examples.

  Examples of the poorly solubilizing chelating agent include dithiocarbamic acid and its salt, specifically, diethylamine dithiocarbamic acid and its salt, piperazine dithiocarbamic acid and its salt.

  Examples of adsorbents include carbonate-based and silicate-based materials, and specific examples include oyster shells and diatomaceous earth.

The inorganic flocculant is a material that forms a hardly soluble substance when it comes into contact with water or air, and immobilizes harmful metals by its scavenger effect.
For example, iron powder, Fe 3+ type salt, Mn 2+ type salt, Al 3+ type salt may be mentioned.

  In the present invention, since the contaminated soil is fixed with the chelating agent after being washed, reduction of the amount of dissolution in the dissolution test can be achieved relatively inexpensively and with high reliability.

(A) shows soil immobilization treatment after washing with chelating agent HIDS and [As] elution amount test result, (b) shows soil immobilization treatment after chelating agent EDDS washing and [As] elution amount test. Results are shown. (A) shows soil immobilization treatment after chelating agent HIDS washing and [Pb] elution amount test results, (b) soil immobilization treatment after chelating agent EDDS washing and [Pb] elution amount test Results are shown.

  Although the example of the soil processing method which concerns on this invention is demonstrated based on the specific test evaluation example, this invention is not limited to this.

<Reagent / Sample>
As the soil sample, soil having a lead content of 11.8 mg / kg and arsenic of 3.1 mg / kg was used.
This soil is contaminated soil whose elution amount exceeded the environmental standard.
For the chelate cleaning solution, 3-hydroxy-2,2′-iminodisuccinic acid (HIDS) and ethylenediamine disuccinic acid (EDDS), which are biodegradable chelating agents, were used.
<Washing with chelating agent>
10 mL of 10 mM chelate aqueous solution was added to 1.0 g of soil, and shaken at 25 ° C. and 200 rpm for 24 hours.
The extract was subjected to suction filtration using GF / C glass fiber filter paper (particle retention capacity: 1.2 μm), and then the metal ion concentration in the solution was quantified with an ICP emission spectrometer (ICP-AES) or a flameless atomic absorption device. .
The lead and arsenic concentrations of the samples were determined by content tests (1 mol L −1 HCl extraction, 2003 Ministry of the Environment Notification No. 19) and dissolution tests (water extraction at pH 5.8 to 6.3, 1991 Environment Agency). It was measured according to Notification No. 46).
<Immobilization process>
The soil sample after washing with a chelating agent was rinsed with 10 mL of purified water, and then subjected to immobilization.
When the immobilizing agent is liquid, 10 mL of 10 mM immobilizing solution is added to 1.0 g of soil sample, shaken at 25 ° C. and 200 rpm for 30 minutes, and then GF / C glass fiber filter paper (particle retention capacity 1.2 μm). The soil solid-liquid separated by the suction filtration used was used.
When the immobilizing agent was solid, 5% by weight was added to the soil sample after washing with the chelating agent and mixed well.
The subsequent dissolution test was performed in the same manner as described above.

The results are shown in the graphs of FIGS.
In the graph, “after HIDS cleaning” and “after EDDS cleaning” are those in which an elution amount test was performed without immobilization after cleaning with a chelating agent.
In the graph, DTC diethylammonium salt indicates a salt of diethylamine dithiocarbamic acid, and DTC sodium and DTC ammonium salt are salts of dithiocarbamic acid.
Oyster shell / glass is obtained by mixing and melting oyster shell powder and glass powder.
.
In the dissolution test, the influence of the chelating agent used for washing is also observed.
In the case of harmful metals [As], the DTC-based immobilizing agent and the effect of immobilizing oyster shells, diatomaceous earth, and iron powder are recognized.
For harmful metals [Pb], the effects of DTC-based fixing agents, oyster shells and diatomaceous earth are great.

Claims (1)

  1. Washing the contaminated soil as a biodegradable chelating agent with a washing solution to which 3-hydroxy-2,2′-iminodisuccinic acid (HIDS) is added;
    A step of bringing the washed contaminated soil into contact with an immobilizing treatment agent, thereby reducing the amount of harmful metals eluted with respect to the dissolution amount test,
    Processing method of contaminated soil the fixing treatment agent which is a oyster shells.
JP2014194423A 2014-09-24 2014-09-24 Treatment method of contaminated soil Active JP6493728B2 (en)

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Family Cites Families (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5235035B2 (en) * 1972-12-29 1977-09-07
JP3407041B2 (en) * 2000-08-15 2003-05-19 独立行政法人産業技術総合研究所 Cleaning agent and stabilizer for selenium-contaminated soil and method for remediating selenium-contaminated soil using the same
JP2003159583A (en) * 2001-11-27 2003-06-03 Kurita Water Ind Ltd Treatment method for heavy metal polluted soil or waste
JP2003225640A (en) * 2001-11-30 2003-08-12 Matsuda Giken Kogyo Kk Solidifying and insolubilizing agent for contaminated soil
JP2004066129A (en) * 2002-08-07 2004-03-04 Foundation For Advancement Of International Science Method of restoring soil polluted with heavy metal
JP3706618B2 (en) * 2003-05-02 2005-10-12 有限会社アムスエンジニアリング Solidification / insolubilizer and solidification / insolubilization method for soil, incineration ash, coal ash, and gypsum board waste
JP2005199221A (en) * 2004-01-19 2005-07-28 Japan Organo Co Ltd Detoxicating processing method for sludge or soil
JP4235688B2 (en) * 2004-02-27 2009-03-11 信彦 和田 Purification method for contaminated soil
JP2005288378A (en) * 2004-04-02 2005-10-20 Ebara Corp Treatment method of contaminated medium including heavy metals and treatment agent
JP2007098299A (en) * 2005-10-05 2007-04-19 Teijin Fibers Ltd Method for cleaning heavy metal contaminated soil using chelating agent as cleaning agent
JP2008238150A (en) * 2007-03-27 2008-10-09 Chemical Yamamoto:Kk Detoxification agent for contaminated soil and industrial waste containing hexavalent chromium
JP5155619B2 (en) * 2007-08-07 2013-03-06 コスモ石油株式会社 Soil and groundwater purification promoter and purification method
KR20100029410A (en) * 2008-09-08 2010-03-17 강원대학교산학협력단 Method for treating soils contaminated by heavy metals using ostershell and soil treatment agent
JP5164169B2 (en) * 2009-03-03 2013-03-13 国立大学法人金沢大学 How to clean hazardous metal contaminants
JP6125824B2 (en) * 2012-12-19 2017-05-10 株式会社竹中工務店 Cleaning liquid composition for heavy metal contaminated soil and method for cleaning heavy metal contaminated soil

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