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Treating method of soil polluted by benzene hexachloride

A technology of polluted soil and treatment method, applied in the restoration of polluted soil, etc., can solve problems such as polluted groundwater, achieve the effect of improving removal rate, good dispersion performance, and improving adsorption and reduction degradation performance

Inactive Publication Date: 2017-06-23
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The use of sludge biochar / nZVI in wastewater, polluted groundwater, especially polluted soil has not been reported yet

Method used

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  • Treating method of soil polluted by benzene hexachloride
  • Treating method of soil polluted by benzene hexachloride
  • Treating method of soil polluted by benzene hexachloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for processing H66-contaminated soil, the steps are as follows:

[0030] (1) Take 100g of municipal sludge, dry it, compact it into a crucible, cover it, put it into a muffle furnace and burn it with limited oxygen for 2 hours, set the temperature at 300°C, and grind it through a 60-mesh sieve after cooling. The <60 mesh sludge biochar was washed 3 times with deionized water, dried, and sealed for storage. The ash content of the obtained sludge biochar was determined to be 78.6%, and the main components were inorganic minerals (such as silicon dioxide, anhydrite, magnetite, etc.) and the like.

[0031] (2) Weigh FeSO 4 ·7H 2 O is added to the mixed system of absolute ethanol / water (30 / 70V / V), fully dissolved, and the solution is transferred to a three-necked flask equipped with an electric stirring device, and a certain amount of the above-mentioned preparation is added according to the iron loading of 33.3wt%. sludge biochar, and stir evenly. In the three-...

Embodiment 2

[0048] The process is the same as in Example 1, except that the target pollutant in the soil is α-HCH (content is 20 mg / kg). Other process parameters and results in the process are shown in Table 2.

Embodiment 3

[0050] The process is basically the same as in Example 2, except that the high-temperature pyrolysis temperature in step 2) is 500° C., and the process parameters and results are shown in Table 2.

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Abstract

The invention discloses a treating method of soil polluted by benzene hexachloride. The treating method comprises the following steps that (1) biological sludge is subjected to drying, then oxygen-limited burning, high-temperature pyrolysis for 3-4 hours at the temperature of 300-500 DEG C, cooling, grinding, sieving through a 60-mesh sieve, washing with deionized water and drying to obtain sludge biochar powder; (2) ferrous sulfate is added into the sludge biochar powder according to the mass ratio of ferrum to mud biochar powder being 1:2-1:5, and NaBH4 is dropwise added into the mixed sludge biochar powder under the nitrogen atmosphere; and product is subjected to centrifugal washing, drying under the nitrogen atmosphere, and grinding and sieving through the 60-mesh sieve to obtain sludge biochar / nZVI composite material powder; and (3) the composite material powder is mixed with the soil polluted by the benzene hexachloride, then the water is added to prepare polluted soil slurry, and the polluted soil slurry is subjected to a stirring reaction for more than 24 hours under the closed oxygen insulation condition. The method adopts the biological sludge as a raw material, and the prepared sludge biochar / nZVI composite material powder can be used for improving the removal rate of the benzene hexachloride and promoting the resource utilization of the sludge.

Description

technical field [0001] The invention belongs to the technical field of remediation of polluted soil, and in particular relates to a method for treating HCH polluted soil. Background technique [0002] The problem of soil pollution caused by organochlorine pesticide pollutants in my country is very serious, especially BHC and DDT have been produced and used in large quantities. In recent years, with the implementation of the Stockholm Convention and the rapid development of urbanization, these HC66 production enterprises have been closed down one after another, leaving a series of soil pollution problems. However, the soil remediation technology for such refractory chlorinated pollutants is still lacking. [0003] As a green and economical remediation technology, zero-valent iron reduction has been widely studied and applied in the treatment of wastewater / groundwater polluted by organochlorine and heavy metals. Nano zero-valent iron technology (nZVI) is the improvement and ...

Claims

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Application Information

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IPC IPC(8): B09C1/10
CPCB09C1/10
Inventor 万金忠张胜田何跃龙涛李群周艳吴运金邓绍坡赵欣应蓉蓉祝欣王磊
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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