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Method for repairing hexavalent chromium polluted substrate sludge by utilizing zero-valent iron

A technology of polluted sediment and zero-valent iron, applied in the field of polluted environment restoration, can solve the problems of low efficiency and large investment, and achieve the effect of low energy consumption, low investment and good restoration effect

Inactive Publication Date: 2008-09-17
SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the shortcomings of the existing hexavalent chromium-contaminated sediment pollution repair technology, such as large investment and low efficiency, and provide an efficient and low-cost method for repairing hexavalent chromium-contaminated sediment by using zero-valent iron

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The sediment samples of the Panjin section of the Hunhe River in the Liaohe River Basin were selected. Reduced iron powder was passed through a 200-mesh sieve, using 0.5mol·L -1 The surface oil was washed off with hydrochloric acid, and dried under nitrogen protection for later use. Add 10g of bottom mud and 90ml of distilled water to a bottle with a total volume of 100ml, wherein the concentration of hexavalent chromium is 30mg·kg -1 . To each bottle, add 0.02 g of reduced iron powder, which accounts for 0.2% of the dry weight of the sediment, and mix thoroughly. Each bottle is filled with 100ml of high-purity nitrogen with a purity of 99.99% to drive off residual oxygen to ensure an anaerobic environment for the sediment. -1 Culture in the dark to promote the removal of hexavalent chromium in the sediment. Removal effect of hexavalent chromium: After 48 hours, the removal rate of hexavalent chromium reached 99.7%±4.8%, which was 80.1% higher than that of the contr...

Embodiment 2

[0030] The difference from Example 1 is that:

[0031] The sediment samples of the Shenyang section of the Hunhe River in the Liaohe River Basin were selected. Reduced iron powder was passed through a 200-mesh sieve, using 0.5mol·L -1 The surface oil was washed off with hydrochloric acid, and dried under nitrogen protection for later use. Add 10g of bottom mud and 90ml of distilled water to a bottle with a total volume of 100ml, wherein the concentration of hexavalent chromium is 150mg·kg -1 . Add 0.2 g of reduced iron powder, which accounts for 2% of the dry weight of the sediment, into each bottle, and mix thoroughly. Each bottle was filled with high-purity nitrogen for 10 minutes to drive off residual oxygen and ensure the anaerobic environment of the sediment. -1 Culture in the dark to promote the removal of hexavalent chromium in the sediment. After 48 hours, the removal rate of hexavalent chromium reached 89.4%±4.3%, which was 69.6% higher than the control treatment...

Embodiment 3

[0033] The difference from Example 1 is that:

[0034] The sediment samples of the Panjin section of the Hunhe River in the Liaohe River Basin were selected. Take the scrap iron scraps from the Mechanical Processing Plant of the Institute of Metal Research, Chinese Academy of Sciences, pass through a 2mm sieve, wash with n-hexane, an organic solvent, and use 1 mol·L after the n-hexane has evaporated. -1 Wash with hydrochloric acid, rinse with distilled water to remove residual hydrochloric acid, and repeat the washing twice to completely remove surface oil stains. Add 10g of bottom mud and 90ml of distilled water to a bottle with a total volume of 100ml, and the concentration of hexavalent chromium pollution is 500mg·kg -1 . Add 0.1 g of iron filings, which accounts for 1% of the dry weight of the sediment, into each bottle, and mix well. Each bottle was filled with high-purity nitrogen for 10 minutes to drive off residual oxygen and ensure the anaerobic environment of the ...

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Abstract

The invention relates to the field of polluted environment restoration, particularly to a method for restoring hexavalent chrome polluted substrate sludge by using zero-valent ferrum. The inventive method utilizes the chemical reduction and adsorption coprecipitation properties of zero-valent ferrum to remove hexavalent chrome in polluted substrate sludge. The method comprises the steps of reducing hexavalent chrome in the substrate sludge to trivalent chromium by adding a certain amount of zero-valent ferrum such as reduced iron powder and iron dust to the substrate sludge to form chromic hydroxide precipitate under approximate neutrality condition of the substrate sludge, so as to remove the toxicity of hexavalent chrome. The inventive method can efficiently remove hexavalent chrome in the substrate sludge and eliminate the hexavalent chrome pollution to environment. The inventive method has the advantages of simple process, low energy consumption, and low investment; and is suitable for restoring hexavalent chrome polluted substrate sludge.

Description

technical field [0001] The invention relates to the technical field of remediation of polluted environments, in particular to a method for remediating hexavalent chromium polluted sediment by utilizing zero-valent iron. Background technique [0002] Sediment is an important part of rivers and one of the important centers of material exchange and energy flow cycle in river aquatic ecosystems. [0003] When water pollution occurs, pollutants are continuously adsorbed and desorbed between the water body and the sediment to achieve a dynamic balance. However, once the environmental conditions, such as temperature, flow rate, pH value, etc., change, the dynamic balance of pollutant distribution is broken. , the pollutants in the sediment will be released from the sediment, affecting the water quality of the overlying water, and then affecting the health of aquatic organisms and even human beings. After the river water pollution source is controlled, the sediment will become the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/00C02F101/22
Inventor 张颖王新新王元芬韩斯琴李慧史荣久杨伟超徐慧陈冠雄
Owner SHENYANG INST OF APPLIED ECOLOGY - CHINESE ACAD OF SCI
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