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Heavy metal treating agent and heavy metal pollutants treating method

A treatment method and technology of pollutants, applied in the direction of water pollutants, restoration of polluted soil, sludge treatment, etc., can solve the problem of harmful gas generation, and achieve the effect of excellent storage stability

Active Publication Date: 2011-01-19
TOSOH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this has the problem of generating harmful gases from sulfur compounds

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] 4.7 parts by weight of citric acid monohydrate, 12.4 parts by weight of ferrous sulfate heptahydrate, and 82.8 parts by weight of NaOH aqueous solution were added to adjust the pH to about 5, and the mixture was left to stand at room temperature and open to the atmosphere. Table 1 shows the initial pH and the results of the storage stability test.

[0069] The stable period of the heavy metal treating agent is the period until precipitation (suspension) occurs in the aqueous solution.

Embodiment 2

[0071] 3.0 parts by weight of DL-malic acid, 12.4 parts by weight of ferrous sulfate heptahydrate, and 84.6 parts by weight of NaOH aqueous solution were added to adjust the pH to about 5, and the mixture was left to stand at room temperature and open to the atmosphere. Table 1 shows the initial pH and the results of the storage stability test.

Embodiment 3

[0073] Add 5.1 parts by weight of 95% sodium gluconate, 12.4 parts by weight of ferrous sulfate heptahydrate, and 82.4 parts by weight of NaOH aqueous solution, adjust the pH to about 5, and leave it to stand at room temperature and open to the atmosphere. Table 1 shows the initial pH and the results of the storage stability test.

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PUM

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Abstract

Provided is a heavy metal treating agent and a heavy metal pollutants treating method. The invention provides a medicament and a treating method thereof. The medicament is used for treating heavy metal pollutants, like burning ash and fly ash discharged from a garbage burning field, soil polluted by heavy metal, sludge generated from waste water treatment, and heavy metal contained in the waste water discharged by factories. Heavy metal treating agent comprising piperazine dithiocarboxylic acids salt and reductible composition is used. In terms of reductible composition, water soluble bivalent iron compound and aliphatics Alpha - hydroxycarboxylic acid and / or salt, or sulfurated bi-alkali metal salt are preferably used. With the heavy metal treating agent, harmful cation species heavy metal like lead, zincum, cadmium, mercury, arsenic, selenium, and hexavalent chromium can be treated by encapsulation in a high concentration, and harmful anion species heavy metal like hexavalent chromium, arsenic and selenium can be treated by encapsulation in a high concentration.

Description

technical field [0001] The invention relates to a heavy metal treatment agent and a treatment method for heavy metal pollutants. The heavy metal treatment agent can treat heavy metal pollutants with high insolubility, such as incineration ash and fly ash discharged from waste incineration sites, soil polluted by heavy metals, and waste water produced after treatment. Harmful heavy metals such as lead, zinc, cadmium, mercury, arsenic, selenium, and hexavalent chromium contained in sludge and wastewater discharged from factories, etc., especially hexavalent chromium, arsenic, and selenium that are difficult to treat with common chelating agents, and have high stability. Background technique [0002] Fly ash discharged from municipal waste incineration plants, etc. contains a high content of heavy metals, and it is necessary to perform a treatment to suppress the elution of heavy metals. As one of such treatment methods, there is a chemical treatment method in which a heavy me...

Claims

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Application Information

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IPC IPC(8): A62D3/33A62D3/37B09C1/08C02F1/62C02F1/70C02F11/00A62D101/43A62D101/47A62D101/40A62D101/08C02F101/20
Inventor 阿山义则疋田英树清水要树中本义行长岭利登吉光满明长井康行
Owner TOSOH CORP
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