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Contaminated Site Remediation Methods

A site remediation and site technology, applied in the field of contaminated site remediation, to achieve the effect of reducing the mass transfer process, thoroughly rehabilitating the contaminated site, and high remediation efficiency

Active Publication Date: 2016-04-06
山东冽泉环保工程咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the above existing problems in the prior art, the present invention proposes a method for remediating contaminated sites, which can overcome the limited technical effectiveness of nano-zero-valent iron technology in the later stage of remediating contaminated sites, and can obtain rapid and thorough remediation effects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The invention is implemented as follows:

[0013] 1) Select the polluted site to be repaired, and take samples to detect the types and degrees of pollutants: chlorinated hydrocarbon pollutants (trichlorethylene and tetrachlorethylene), mainly in the residual phase, and the total mass of pollutants is 80kg-210kg , the pollution area is 1000m 2 , the pollution depth is more than 10 meters underground, and the average total concentration of pollutants in groundwater reaches 896ug / L;

[0014] 2) Inject the suspension of palladium-coated nanometer zero-valent iron particles underground: 22 injection wells with a depth of 10 meters and 20 monitoring wells are set in the above-mentioned polluted site, and a total of 3000L of 8g / L concentration is injected underground. Palladium (Pd)-coated nano-zero-valent iron particle suspension, the content of Pd is 0.5% of the nano-zero-valent iron quality;

[0015] 3) Regularly take water samples from monitoring wells to detect effectiv...

Embodiment 2

[0020] The invention is implemented as follows:

[0021] 1) Select the polluted site to be repaired, and take samples to detect the type and degree of pollutants: Cr 6+ Pollutants, the total mass of pollutants is 35-70kg, and the pollution area is 600m 2 , the pollution depth is more than 7 meters underground, and the average concentration of pollutants in groundwater reaches 219ug / L;

[0022] 2) Inject metal palladium (Pd)-coated nano-zero-valent iron particle suspension into the ground: 14 injection wells with a depth of 7 meters and 14 monitoring wells are set up in the above-mentioned polluted site, and a total of 1000 L is injected into the ground with a concentration of 9g / L of Pd-coated nano zero-valent iron particle suspension, the Pd content is 0.5% of the nano-zero-valent iron mass;

[0023] 3) Regular detection of effective Fe 0 Existence; water samples were taken from monitoring wells to detect effective Fe 0 amount;

[0024] 4) Using a micro-nano bubble gener...

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PUM

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Abstract

The invention relates to a contaminated site remediation method, belongs to the technical field of treatment of contaminated sites, and particularly relates to a method for remedying contaminated soil and contaminated sites with a NZVI (nanoscale zero valent iron) reduction method. The remediation method is mainly characterized in that a metal clad NZVI particle suspension is injected to underground contaminated sites, and a carrier liquid with dispersed H2 micro-nano bubbles is injected to the underground contaminated sites along an NZVI particle suspension injection well in the late period of remediation with NZVI particles when the effective Fe0 is used up. High activity of the NZVI has higher remediation efficiency on high-concentration contaminants, however, when the metal clad NZVI particle is used up in the late period of remediation and loses activity, the injected H2 micro-nano bubbles are activated under the catalytic action of the residual cladding precious metal to form H atoms, and the active H atoms remedy low-concentration contaminants in the late period rapidly and thoroughly, so that the thoroughness of contaminated site remediation is guaranteed.

Description

technical field [0001] The invention relates to a method for remediating polluted sites, which belongs to the technical field of processing polluted sites, and in particular relates to a method for remediating polluted soil and polluted sites by using a nanometer zero-valent iron reduction method. Background technique [0002] As the problem of environmental pollution is getting worse, the soil remediation industry will first need to solve the problem of remediation of a large number of polluted sites, so as to solve the problem of urban land shortage in the current rapid urbanization development plan. [0003] For different pollutants, common contaminated site remediation techniques include chemical oxidation / reduction methods, biological oxidation / reduction methods, and physical methods (such as extraction-treatment), but these methods may have high costs, great impact on the environment, or microbial domestication Difficulty, low bioavailability, rapid rebound of pollutan...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/10
Inventor 李静刘骁勇
Owner 山东冽泉环保工程咨询有限公司