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Agent for purifying soil and/or underground water and purification method

A groundwater and purification agent technology, applied in the direction of chemical instruments and methods, restoration of contaminated soil, contaminated groundwater/leachate treatment, etc., can solve the problem that the oxidant cannot reach, prevent the decomposition of hydrogen peroxide, and expand the purification range, ease of use

Active Publication Date: 2013-05-01
MITSUBISHI GAS CHEM CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, hydrogen peroxide proposed as a preferred oxidizing agent is also added in the presence of a catalyst, so there is a disadvantage that the oxidizing agent cannot reach a place far from the injection site.

Method used

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  • Agent for purifying soil and/or underground water and purification method
  • Agent for purifying soil and/or underground water and purification method
  • Agent for purifying soil and/or underground water and purification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] make FeSO 4 ·7H 2 O (Wako Pure Chemical Industries, Ltd., special grade reagent) was dissolved in pure water to prepare simulated groundwater. To a 35% by weight aqueous solution of hydrogen peroxide (manufactured by Mitsubishi Gas Chemical Co., Ltd., for industrial use), 20 parts by weight of citric acid (anhydrous) (manufactured by Kosho Chemical Co., Ltd.) was added to 100 parts by weight of hydrogen peroxide. special grade reagent), sodium hydroxide (made by Wako Pure Chemical Industries, Ltd., special grade reagent) in which the molar ratio of alkali and citric acid is sodium hydroxide / citric acid = 2.85 / 1 (molar ratio), and pure water (relative to peroxide The total amount of hydrogen and citric acid added was 568 parts by weight) and dissolved to prepare a scavenger (water content was 723 parts by weight relative to the total of 100 parts by weight of hydrogen peroxide and citric acid). The simulated groundwater and the purifying agent were mixed so that the hy...

Embodiment 2～5

[0121] To a 35% by weight aqueous hydrogen peroxide solution (manufactured by Mitsubishi Gas Chemical Co., Ltd., for industrial use), 20 parts by weight of citric acid (anhydrous) (manufactured by Koso Chemical Co., Ltd.) was added to 100 parts by weight of hydrogen peroxide. , special grade reagent), sodium hydroxide and pure water and dissolve them to prepare a purifying agent. The molar ratio of the alkali and citric acid in the scavenger was sodium hydroxide / citric acid=2.95 / 1 to 2.20 / 1. Table 3 shows the amount of pure water added and the water content in the purifying agent. The pH of the prepared scavenger is shown in Table 3.

Embodiment 6

[0127] make FeSO 4 ·7H 2 O (Wako Pure Chemical Industries, Ltd., special grade reagent) was dissolved in pure water to prepare simulated groundwater. To a 35% by weight aqueous hydrogen peroxide solution (manufactured by Mitsubishi Gas Chemical Co., Ltd., for industrial use), 100 parts by weight of citric acid (anhydrous) (manufactured by Kosho Chemical Co., Ltd.) was added with respect to 100 parts by weight of hydrogen peroxide. Special-grade reagent), sodium hydroxide whose molar ratio of alkali and citric acid is sodium hydroxide / citric acid=2.85 / 1 (molar ratio), and pure water (100 parts by weight based on the total amount of hydrogen peroxide and citric acid added) , 278 parts by weight) and dissolved to prepare a scavenger (with respect to the total of 100 parts by weight of hydrogen peroxide and citric acid added, the water content is 370 parts by weight).

[0128] The simulated groundwater and the purifying agent were mixed so that the hydrogen peroxide concentratio...

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Abstract

Provided is a purifying agent which is easily applicable to a method for in situ purification of soil and / or underground water contaminated with an organic compound without affecting the surrounding environment, ecological system and so on and by which the soil and / or underground water can be safely and effectively purified over a wide range including areas relatively far from the injection site.  Also provided is a purification method with the use of the purifying agent.  An agent for purifying soil and / or underground water comprising  100 parts by weight of hydrogen peroxide (A), at least 10 parts by weight of citric acid (B), and at least 15 parts by weight of water (C) referring the sum of hydrogen peroxide (A) and citric acid (B) as to 100 parts by weight, characterized in that an alkali compound (D) is added so as to satisfy the requirement for the proton number of citric acid (B) according to formula (1): proton number of citric acid (B)=0.05×M to 0.80×M      (1) wherein M represents the number of citric acid (B) moles. A purification method which comprises adding (A) to (D) to soil and / or underground water.

Description

technical field [0001] The present invention relates to a purification agent for soil and / or groundwater contaminated with organic compounds and a purification method using the same. Background technique [0002] It is known that organic pollutants in soil and groundwater have a great impact on the environment. Therefore, while improving various regulations, it is necessary to purify the pollution that has been accumulated and deposited so far. The organic matter here mainly refers to the organic matter that is difficult to be decomposed by biological organisms, and the aromatic compounds, halogenated organic compounds, etc. contained in pesticides, preservatives, petroleum and its fractions correspond to the organic matter. [0003] For this organic pollution, various purification methods, physical, chemical and biological, have been tried. Physical purification methods can purify contaminated sites, but have the disadvantage of requiring secondary treatment to remove cont...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/02B09C1/08B09C1/10C02F1/72
CPCC02F2101/32B09C1/08C02F2103/06B09C1/02C11D7/265C02F1/722C11D11/0011C11D3/3947B09C1/002C02F1/725
Inventor 吉冈成康君塚健一海老原孝
Owner MITSUBISHI GAS CHEM CO INC
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