Encapsulating agent for harmful substances and method for encapsulation of harmful substances

A technology of harmful substances and solubilizers, applied in chemical instruments and methods, combustion methods, solid waste removal, etc., can solve the problems of expensive chelating agents, environmental degradation, etc., and achieve the effect of simple treatment

Inactive Publication Date: 2010-02-10
AZMEC +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0024] In addition, in the method of using a chelating agent, in addition to the problem of cost due to the fact that the chelating agent is generally expensive, there is also the problem that the chelating agent is easily deteriorated in the environment because it is an organic material.

Method used

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  • Encapsulating agent for harmful substances and method for encapsulation of harmful substances
  • Encapsulating agent for harmful substances and method for encapsulation of harmful substances

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Potassium dichromate was added to the soil, and the contaminated soil with the hexavalent chromium content in the soil adjusted to 200mg / kg was simulated, and it was stored in a moist state for 1 week.

[0082] The insolubilizers and water shown in Table 1 were added to this contaminated soil, kneaded for 3 minutes with a mortar mixer, and then stored at a constant temperature of 20° C. for 1 week. Using each sample, a dissolution test was implemented in accordance with the method shown in Notification No. 46 of the Ministry of the Environment in 2013. The results are shown in Table 2.

[0083] The elution amount of hexavalent chromium in the soil to which the insolubilizer was not added was 17 mg / L, which was a very large value. In Comparative Example 2 to which 1.5% by mass of iron disulfide powder was added, the elution amount of hexavalent chromium was very low, but the first soil environmental standard was still not satisfied. Adding alunite or calcined gypsum as...

Embodiment 2

[0090] Add lead nitrate to the soil, simulate the production of contaminated soil with the lead content in the soil adjusted to 3000mg / kg, and store it in a moist state for 1 week. The insolubilizer and water shown in Table 3 were added to the contaminated soil, and after kneading with a mortar mixer for 3 minutes, a compressive strength test specimen of φ50mm and H100mm was produced according to the Cement Association standard JCAS L-01:2003. This test piece was stored at a constant temperature of 20° C. for one week, and a compressive strength test was performed. Furthermore, the test pieces subjected to the compressive strength test were pulverized, and the dissolution test was performed according to the method shown in the Ministry of the Environment Notification No. 46. The results are shown in Table 4.

[0091] [table 3]

[0092]

[0093] Here, the iron disulfide powder (pyrite powder) was used as a pulverized product made in China (Fe: 43%, S: 47%, particle size -1...

Embodiment 3

[0098] In this example, the insolubilization treatment of alkaline incineration ash was performed.

[0099] The elution suppression of incineration fly ash having the composition in Table 5 and the characteristics of the harmful substance content in Table 6 was studied. The ash has a general composition of alkaline incineration ash and contains a lot of lead and fluorine.

[0100] Table 7 shows the results of the dissolution test of this ash in accordance with the method specified in Ministry of the Environment Ordinance No. 46. The elution amount of lead in the incineration ash exceeds the second elution amount standard which is the acceptance standard to the processing site. In addition, since incineration ash contains a large amount of calcium, the leached amount of fluorine is not so much, and it is below the second leached amount standard. For other harmful substances, the results were all below the standard, and it is known that the effective treatment of lead is the m...

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Abstract

The invention provide a technique for the treatment of harmful substances by which the inhibition of soil or ash containing lead, cadmium, mercury, hexavalent chromium, selenium and / or arsenic in a high concentration from dissolving and the decomposition of organochlorine compounds such as trichloro- ethylene, polychlorinated dibenzo-p-dioxins and PCB into harmless substances can be attained economically and effectively. The invention relates to an encapsulating agent which contains sulphide iron ore and an activator and which may further contain soft-burned magnesia, cement, quicklime, slakedlime, magnesium carbonate, limestone, dolomite and / or alkali silicates. The encapsulating agent makes it possible to conduct reliably and economically the inhibition of lead, cadmium, mercury, hexavalent chromium, selenium and / or arsenic contained in soil or ash from dissolving and the decomposition of organochlorine compounds such as trichloroethylene, polychlorinated dibenzo -p-dioxins and PBCinto harmless substances. The encapsulating agent is also favorably usable as an encapsulating agent or blowing agent for incineration ash containing lead, hexavalent chromium, or the like in a high concentration. The soil or incineration ash encapsulated with the agent is in a harmless and firmly hardened state and therefore permits safe recycling.

Description

technical field [0001] The present invention relates to an insolubilizer composition for inhibiting the dissolution of harmful substances contained in soil, coal ash, incineration ash, and the like. Background technique [0002] In Japan, the number of cases of land recognized as soil pollution has increased dramatically since 2008, and currently, it is estimated that soil pollution occurs in about 320,000 places. In addition, the status of soil pollution outside of Japan is estimated to be 500,000 in the United States, 700,000 in Europe and France, and 300,000 in Germany. Furthermore, in the Asian region, due to rapid industrialization in recent years, it can be said that various environmental problems including soil pollution have arisen multiple times. [0003] According to the "2016 Soil Pollution Countermeasures Act Implementation Status and Survey Results of Soil Pollution Survey and Countermeasures" published by the Ministry of the Environment of Japan, among the soi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/02B09C1/08C09K17/06C09K17/08C09K17/10C09K17/12C09K3/00C09K17/02A62D3/33A62D3/37A62D101/08A62D101/43B09B3/00F23J7/00
CPCF23J2215/60F23G5/02B09C1/08B09B3/0041F23G2209/30F23G7/14F23J2215/30B09B3/25
Inventor 正田武则山崎淳司松方正彦
Owner AZMEC
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