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Restoration method of severely combined pollution site

A technology of composite pollution and remediation methods, applied in the restoration of polluted soil and other directions, can solve the problems of high energy consumption of thermal remediation technology and limited elution of single eluent in leaching technology, and achieve significant catalytic oxidation effect and preparation process. Simple, solve the effect of high energy consumption

Active Publication Date: 2015-03-25
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a remediation method for a heavily polluted site. The problem of solvent elution limitation and high energy consumption of thermal repair technology

Method used

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  • Restoration method of severely combined pollution site
  • Restoration method of severely combined pollution site
  • Restoration method of severely combined pollution site

Examples

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Embodiment 1

[0036] Aiming at the complex pollutants of heavy metals and organic matter, the self-prepared heavy metal Cd, Zn, organic matter p-nitrophenol (4-NP), and phenol compound simulated polluted soil were used as the experimental object, and microwave-assisted iron-loaded attapulgite was used to treat the polluted soil experiment. The soil quality of the simulated soil belongs to sandy loam, and the concentrations of Cd, Zn, 4-NP, and phenol in the simulated polluted soil are 10, 10, 500, and 500 mg / kg, respectively. The preparation of iron-loaded attapulgite uses a concentration of 1M hydrochloric acid to activate attapulgite, and the activated attapulgite is treated with FeCl 2 , FeCl 3 , the NaOH concentration ratio is 1:2.5:2.5, and the NaOH concentration is 0.5M to prepare iron-loaded attapulgite, add NaOH to a pH value of 11, vacuum 24h drying temperature at 70°C, and pass through a 100-mesh sieve for later use; pollute the soil, Water and iron-loaded attapulgite are mixed i...

Embodiment 2

[0041] For the complex pollutants of heavy metals and organic matter, self-prepared heavy metal Cd, Pb, organic matter p-nitrophenol (4-NP), 2,4-dichlorophenol (2,4-DCP) composite simulated polluted soil was used as the experimental object. Microwave-assisted iron-loaded attapulgite treatment of contaminated soil experiments. The soil quality of the simulated soil belongs to sandy loam, and the concentrations of Cd, Pb, 4-NP, and 2,4-DCP in the simulated polluted soil are 10, 10, 500, and 500 mg / kg, respectively. Preparation of iron-loaded attapulgite, two kinds of iron-loaded attapulgite were prepared, the selected concentration was 1M hydrochloric acid to activate attapulgite, and one activated attapulgite was used 0.2MFe(NO 3 ) 3 The iron-loaded attapulgite material was prepared by impregnation. The impregnation time was 24 hours, and the calcination temperature was 400°C. After calcination for 3 hours, it was ground through a 100-mesh sieve for use. An activated attapulgi...

Embodiment 3

[0046] For the complex pollutants of heavy metals and organic matter, self-prepared heavy metal Zn, Pb, organic matter p-nitrophenol (4-NP), 2,4-dichlorophenol (2,4-DCP) composite simulated polluted soil was used as the experimental object. The soil quality of the simulated soil is sandy soil, and microwave-assisted iron-loaded attapulgite treatment of contaminated soil experiments was carried out on the simulated soil. In the simulated polluted soil, the concentrations of Zn, Pb, 4-NP and 2,4-DCP were 10, 10, 500 and 500 mg / kg, respectively. Preparation of iron-loaded attapulgite, two kinds of iron-loaded attapulgite were prepared, the selected concentration was 1M hydrochloric acid to activate attapulgite, and one activated attapulgite was prepared with 0.2MFe(NO 3 ) 3 The iron-loaded attapulgite material was prepared by impregnation. The impregnation time was 24 hours, and the calcination temperature was 400°C. After calcination for 3 hours, it was ground through a 100-mes...

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Abstract

The invention discloses a restoration method of a severely combined pollution site. By utilizing the method, an organic matters and heavy metal combined pollution site can be treated by utilizing iron-carrying attapulgite and microwave assistance. According to the restoration method, the iron-carrying attapulgite adsorbs organic matters and stabilizes heavy metal by self structure charge and lattice imperfection through hydroxyl complexing and chelating action, the iron-modified activated attapulgite has excellent wave absorbing property under the microwave action, so that soil temperature rise is benefited and the heavy metal is fixed to realize long acting and stability; the high-temperature degradation action of the iron-modified activated attapulgite under microwave field catalyzes oxygen in air and moisture in soil to excite the oxidative degration action of hydroxyl radicals for treating the organic matters, the excellent specific surface area of the iron-modified activated attapulgite is beneficial to the adsorption of degradation products. According to the novel method provided by the invention, the preparation technology of materials is simple, the treatment reaction technology is simple in flow, low in cost and environmentally friendly and fast and stable.

Description

technical field [0001] The invention belongs to the technical field of treatment of heavily compound polluted sites, and more specifically relates to a repair method for heavily compound polluted sites. Background technique [0002] In recent years, with the rapid development of my country's urbanization process and the adjustment of industrial layout, a large number of chemical, smelting, electroplating and other enterprises in the old urban areas of most large and medium-sized cities have been relocated or closed. Perfection, resulting in the legacy of a large number of heavily polluted sites. Most of these heavily polluted sites have complex pollution of high concentrations of heavy metals and organic matter. [0003] The remediation of soil contaminated by organic matter and heavy metals mainly includes physical remediation, biological remediation and chemical remediation. The cost of physical methods is high, and the amount of work for high-concentration heavy metal-con...

Claims

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Application Information

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IPC IPC(8): B09C1/06B09C1/08B09C1/02B09C1/00
Inventor 陈静王琳玲杨蓉王鑫李鸿博
Owner HUAZHONG UNIV OF SCI & TECH
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