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Method for regenerating eluant in organic polluted soil eluent

A technology for organic pollution and eluent, applied in the fields of environmental protection and chemistry, to achieve the effects of mature process conditions, environmental friendliness and low cost

Inactive Publication Date: 2011-10-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The task of the present invention is to provide a method for regenerating the eluent in the eluent of organic polluted soil, so as to overcome the deficiencies of the existing organic polluted soil synergistic eluent treatment technology, especially the eluent regeneration technology

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] A mixed solution with a hexachlorobenzene concentration of 1 mg / L and a rhamnolipid concentration of 7.5 g / L was prepared as the rhamnolipid eluent for simulating hexachlorobenzene-contaminated soil. Add powdered activated carbon to the eluent at a dose of 10 g / L, shake at a constant temperature of 30°C for 6 hours, centrifuge, and take the supernatant to analyze the content of hexachlorobenzene and rhamnolipid. When determining hexachlorobenzene, n-hexane is used as the extractant, the extraction ratio is 1:1, and the hexachlorobenzene in the extract is determined by gas chromatography-electron capture detector. Rhamnolipids were determined by surface tensiometer-quantitative loop method. The results showed that more than 98% of HCB in the rhamnolipid solution could be adsorbed and removed by activated carbon, and the corresponding rhamnolipid adsorption loss was about 17%.

[0017] At the same time, the effects of the initial concentration of hexachlorobenzene and rh...

Embodiment 2

[0019] Hexachlorobenzene-contaminated soil was obtained from a chemical factory in Wuhan. After air-drying, grinding, and sieving, the hexachlorobenzene content was measured to be 20.7mg / kg. Prepare the purchased rhamnolipid powder into a solution with a concentration of 25g / L, mix it with soil at a solid-to-liquid ratio of 1:10, and shake it on a constant temperature oscillator at 25°C for 48h. After centrifugation, the supernatant was passed through a 0.45 μm cellulose acetate membrane (the above process was defined as one elution). Then, powdered activated carbon was added to the filtrate at a dose of 10 g / L, shaken at 30° C. for 6 h, and centrifuged to obtain a regenerated rhamnolipid solution (defined as primary adsorption). The contents of hexachlorobenzene and rhamnolipid in the eluate before and after the adsorption were determined respectively. Determination method is the same as application example 1. The results show that: the elution rate of hexachlorobenzene in ...

Embodiment 3

[0023] Prepare a mixed solution with a hexachlorobenzene concentration of 1 mg / L and a Triton X-100 concentration of 6.5 g / L (10 mmol / L) as the Triton X-100 eluent for simulating hexachlorobenzene-contaminated soil. Add granular activated carbon with a particle size between 14 and 50 meshes to the eluent at a dose of 10 g / L, shake at a constant temperature at 30°C for 6 hours, centrifuge, and take the supernatant to analyze hexachlorobenzene and triton X- 100 content. Hexachlorobenzene was extracted by n-hexane and determined by gas chromatography-electron capture detector. Triton X-100 was determined by high performance liquid chromatography-UV detector-C18 reversed-phase chromatographic column. The results show that granular activated carbon can remove 95% of hexachlorobenzene in Triton X-100 solution, and the loss rate of Triton X-100 is about 17%, indicating that the use of particle selective adsorption process can effectively remove Triton X Hexachlorobenzene in the -10...

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PUM

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Abstract

The invention belongs to the technical field of soil pollution repair for environment protection and relates to a method for treating an organic polluted soil synergistic eluent. The method comprises the step: mixing the eluent obtained by eluting and repairing the organic polluted soil with activated carbon according to the absorbability difference of the activated carbon on organic pollutants and a synergistic eluant for selectively absorbing and removing the pollutants in the eluent so as to achieve the regeneration and reuse of the eluant. The method is environmentally-friendly, has the advantages that the operation is simple, the cost is low and the like, and is an effective method for treatment of organic polluted soil synergistic eluents and regeneration of eluents.

Description

technical field [0001] The invention belongs to the fields of environmental protection and chemistry, and relates to soil remediation, in particular to a treatment method for organic polluted soil eluate. Background technique [0002] With the implementation of my country's "Stockholm Convention on Persistent Organic Pollutants (POPs)" and the process of urbanization, a large number of pesticide factories and chemical factories have been closed or relocated, and a large number of polluted sites around the city are facing secondary development. Many of these sites involve high-concentration refractory organic pollution, which poses a serious threat to the safety of the living environment. It is urgent to remediate the soil of these polluted sites. The synergistic elution remediation technology has the characteristics of rapidity and high efficiency, and has obvious technical advantages in the remediation of high-concentration refractory volatile organic pollution sites. Comm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/58C02F101/36C02F101/32
Inventor 陆晓华万金忠
Owner HUAZHONG UNIV OF SCI & TECH
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