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Method of purifying soil and/or groundwater

A groundwater and soil technology, applied in the field of soil and/or groundwater purification, can solve the problems of refractory biodegradation, reduced purification effect, and ineffective implementation

Inactive Publication Date: 2008-05-14
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, EDTA is a poorly biodegradable compound, and when it is actually used for soil purification, especially in-situ purification, it has a great impact on the surrounding environment such as the ecosystem, and it is expected to become a big problem when it is used.
In addition, as also described in Patent Document 5, if the addition amount of the chelating agent is insufficient, metal ion precipitation will occur.

Method used

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  • Method of purifying soil and/or groundwater
  • Method of purifying soil and/or groundwater
  • Method of purifying soil and/or groundwater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～6、 comparative example 1～9

[0060] In a 134ml vial, first, add FeSO 4 ·7H 2 The 15mg-Fe / L of O and the chelating agent which is equimolar to the iron ion make the iron chelating agent coordination compound. Then, add: simulated polluted water in which tetrachlorethylene (PCE) as a volatile organic compound is dissolved at a concentration of 19-28 mg / L, hydrogen peroxide at 680 mg / L (pH range 5-6), or 63 mg / L ( pH range 7~8), or with 660mg / L (the condition of pH range 9~10), and the buffering agent that keeps the pH in the reaction liquid constant sodium bicarbonate / sodium carbonate or acetic acid / sodium acetate combination, add Airtight, carry out purification test. After a certain period of time (1 h) had elapsed from the start of the reaction, the PCE concentration in the solution was measured to confirm the progress of the purification. As a chelating agent, the results of using methylglycine diacetic acid (sodium salt, trade name Trilon (registered trademark), BASF Japan (KK) to provide), L-glutam...

Embodiment 7～14

[0064] Examples 7-14, Comparative Examples 10-16

[0065] In a 134ml vial, first, add FeSO 4 ·7H 2 The 15mg-Fe / L of O and the chelating agent generate iron chelating agent coordination compounds. The addition amount is varied by the molar ratio of the chelating agent to the added iron ion. Then, add: as volatile organic compound tetrachlorethylene (PCE) the simulated polluted water that dissolves with 26~52mg / L concentration, make the pH in the reaction liquid keep constant 7~9 sodium bicarbonate / sodium carbonate combination buffer, and hydrogen peroxide 65mg / L, sealed and carried out the purification test. After a certain period of time (1 h) had elapsed from the start of the reaction, the PCE concentration in the solution was measured to confirm the progress of the purification. As a chelating agent, the results of using methyl glycine diacetic acid and glutamic acid diacetic acid are shown in Examples 7-11, 12-14 in Table 2, and the results of using the addition molar r...

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Abstract

In the purification of soil and / or groundwater polluted by persistent organic compounds, to provide an effective purification method with reduced environmental load. There is provided a method comprising adding a dicarboxymethylamine biodegradable chelating agent of the general formula: (1) in a molar ratio of 0.5 to 4.0 to iron ions being present in purification object soil and / or groundwater to thereby form a complex of biodegradable chelating agent and iron ion and while maintaining the pH value of the purification object at 5-10 preferably with the use of a pH buffering agent, further adding an oxidizer to thereby accomplish purification.

Description

technical field [0001] The present invention relates to: In the soil and / or groundwater purification method that uses hydrogen peroxide as an oxidant, the pollution purification can be performed without reducing the pH of the purification object, and the purification treatment time can be shortened, even for high-concentration pollution. Purified soil and / or groundwater purification method. Background technique [0002] Organic matter pollution in soil and / or groundwater is known to have a large impact on the environment, and various laws and regulations have been enacted. At the same time, it is necessary to purify the accumulated and left-over pollution. Here, the term "organic matter" refers to refractory organic matter that is difficult to decompose mainly by organisms, including pesticides, preservatives, aromatic compounds contained in petroleum and its fractions, organic chlorides, and the like. [0003] Aiming at this organic pollution, various purification methods ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08C02F1/72
CPCB09C1/08B09C1/002B09C1/02C02F1/72
Inventor 田崎贤平松靖史
Owner MITSUBISHI GAS CHEM CO INC
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