A pectin-stabilized nano-zero-valent iron restoration process for groundwater

A nano-zero-valent iron and groundwater technology, applied in the field of environmental pollution control, can solve the problems of large acid-base effect of suspension, poor fluidity, large dosage, etc., to improve dispersion and continuous stability, make up for deficiencies, Conducive to the effect of on-site construction

Inactive Publication Date: 2015-09-09
北京煜环天地工程项目管理咨询有限公司
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Problems solved by technology

[0004] The present invention mainly aims at the problems of large dosage, poor fluidity, and great influence by the acidity and alkalinity of the suspension when simply adding CMC as a dispersant, and provides a process for repairing groundwater with pectin-stabilized nanometer zero-valent iron

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0017] In this example, the pectin-stabilized nano-zero-valent iron restoration process for groundwater requires 100 mL of groundwater containing Cr(VI) at a concentration of 10 mg / L. When using this process, a stabilized nano-zero-valent iron suspension is first prepared.

[0018] Take pectin powder (CAS No. 9000-69-5) and CMC (sodium carboxymethyl cellulose) according to the mass ratio of 1.0:1.0 and mix evenly. Put the above mixed stabilizer in distilled water and heat it under the condition of cutting off oxygen. Make it dissolve completely, and then pass high-purity nitrogen into the dissolved stabilizer solution. The flow rate of high-purity nitrogen is 50mL / min, and the time is 20min. 20mL of FeSO 4 ·7H 2 The O solution was added to the stabilizer solution that was passing high-purity nitrogen gas, and stirred at a constant temperature for 30 minutes under the protection of nitrogen gas. During the stirring process, 15 mL of NaBH with a concentration of 0.05 mol / L 4 Th...

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Abstract

The invention relates to a technology for repairing underground water by virtue of pectin-stabilized nanoscale zero-valent iron and belongs to the underground water repairing technology in the field of environmental pollution control. The technology is mainly used for solving the problems of large addition, poor flowability and large influence caused by the pH value of the suspension, existing when the only addition of CMC (Carboxyl Methyl Cellulose) is adopted as a dispersing agent. The process for repairing underground water by virtue of pectin-stabilized nanoscale zero-valent iron comprises the following steps: (1) preparing a mixed stabilizer from pectin powder and sodium carboxymethylcellulose; (2) preparing a stabilized nanoscale zero-valent iron suspension; (3) injecting the stabilized nanoscale zero-valent iron suspension prepared in the step (2) into an adding well by virtue of a suspension inlet pipe; and (4) after the injection in the step (3) is completed, placing packed columns carrying stabilized nanoscale zero-valent iron in the adding well and fixedly arranging the packed columns carrying stabilized nanoscale zero-valent iron in the adding well for a long time, wherein the radius of influence of each packed column carrying stabilized nanoscale zero-valent iron is 2.0-3.0m and the replacement period is 30-50 days.

Description

technical field [0001] The invention relates to a pectin-stabilized nanometer zero-valent iron restoration technology for groundwater, which belongs to the groundwater restoration technology in the field of environmental pollution control. Background technique [0002] Pollutants produced by human activities seep into the ground and deteriorate the quality of groundwater. In recent years, the situation of groundwater pollution in my country has been severe. 90% of the groundwater in the country has been polluted to varying degrees, and 60% of them are seriously polluted. [0003] At present, there are more than ten kinds of typical groundwater pollution remediation technologies, which are mainly divided into four categories, namely: physical method, chemical method, biological method, and combined remediation method. According to the repair method, it can be divided into heterotopic repair and in situ repair technology. Among them, the in-situ repair technology refers to t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/70C02F1/62
CPCC02F1/705C02F2101/20C02F2101/22C02F2103/06
Inventor 张弛李晓姣曹荣莉赵艾琪赵保军
Owner 北京煜环天地工程项目管理咨询有限公司
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