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Medicament and method for synchronously fixing and reducing trichloro ethylene in soil and/or underground water

A technology of trichloroethylene and groundwater, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc. Low environmental risk, improved removal rate, and low secondary pollution

Active Publication Date: 2019-06-21
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The experimental results of the granular iron column show that at the initial stage of operation (≤20 pore volumes), zero-valent iron can completely remove TCE, but when the operation reaches 90 pore volumes, the zero-valent iron is passivated, and the removal rate of TCE drops to 60%. Accompanied by the production of chlorinated by-products such as cis-1,2-dichloroethylene and vinyl chloride
In addition, granular iron is easily oxidized by oxygen to form FeOOH or Fe(OH) 3 , prevent pollutants from contacting it and block its pores, thereby reducing permeability and conductivity, etc.
[0006] In practical application, the above-mentioned technology has large pH changes, low TCE removal rate and easy generation of 1,1 - Defects with high technical requirements for dichloroethylene, 1,2-dichloroethylene or vinyl chloride, barrier wall permeability coefficient and service life

Method used

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  • Medicament and method for synchronously fixing and reducing trichloro ethylene in soil and/or underground water
  • Medicament and method for synchronously fixing and reducing trichloro ethylene in soil and/or underground water
  • Medicament and method for synchronously fixing and reducing trichloro ethylene in soil and/or underground water

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Experimental program
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Effect test

Embodiment 1

[0061] Present embodiment provides a kind of medicament for synchronously fixing and reducing trichlorethylene in soil and / or ground water, and this medicament comprises the bentonite of 3200g, the nano-iron of 800g, the persulfate and water of 384g, the total mass of bentonite and nano-iron The mass ratio of water to water is 1:50; among them, bentonite is sodium-based bentonite, and Na in sodium-based bentonite + The content is 2.6wt%, the total organic carbon content is 13.7mg / L, the pH is 10.5, and the particle size is 150μm; the persulfate is sodium persulfate; Fe in nano-iron 0 content of 70wt%, α-Fe content of 74wt%, Fe 3 o 4 The content is 18wt%, the FeO content is 8wt%, and the particle size is 50nm;

[0062] The microscopic characterization of bentonite in this embodiment is as follows: Figure 13 and Figure 14 ,from Figure 13 It can be known that the surface of bentonite is irregular polygon, smooth and angular; Figure 14 It can be known that it is mainly c...

Embodiment 2

[0066] Present embodiment provides a kind of medicament for synchronously fixing and reducing trichlorethylene in soil and / or ground water, and this medicament comprises the bentonite of 3200g, the nano iron of 800g, the persulfate of 384g and water, and the mass ratio of bentonite and water is 1:50; Among them, bentonite is sodium bentonite, Na in sodium bentonite + The content is 2.6wt%, the total organic carbon content is 13.7mg / L, the pH is 10.6, the particle size is 120μm, the persulfate is potassium persulfate; Fe in nano-iron 0 content of 70wt%, α-Fe content of 74wt%, Fe 3 o 4 The content is 18wt%, the FeO content is 8wt%, and the particle size is 50nm;

[0067]Simulate the application environment, apply the medicament in this embodiment to 10 mg / kg of TCE-containing soil, the specific application method is as follows: add the persulfate in the medicament to 10 mg / kg of TCE-containing soil, and then add the medicament Bentonite, nano-iron and water in the medicament,...

Embodiment 3

[0069] Present embodiment provides a kind of medicament for synchronously fixing and reducing trichlorethylene in soil and / or ground water, and this medicament comprises the bentonite of 3800g, the nano-iron of 750g, the persulfate and water of 400g, the total mass of bentonite and nano-iron The mass ratio of water to water is 1:55; among them, bentonite is sodium-based bentonite, and Na in sodium-based bentonite + The content is 2.5wt%, the total organic carbon content is 14mg / L, the pH is 10.8, the particle size is 130μm, and the persulfate is sodium persulfate; Fe in nano-iron 0 content of 65wt%, α-Fe content of 78wt%, Fe 3 o 4 The content is 15wt%, the FeO content is 10wt%, and the particle size is 25nm;

[0070] Simulate the application environment, apply the medicament in this embodiment to the groundwater containing TCE of 10mg / L, the specific application method is as follows: the persulfate and water in the medicament are added to the groundwater containing TCE of 10...

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Abstract

The invention discloses a medicament and method for synchronously fixing and reducing trichloro ethylene in soil and / or underground water. According to the medicament for synchronously fixing and reducing the trichloro ethylene in the soil and / or the underground water, bentonite, nano-iron, persulfate and water are adopted according to a specific mixing ratio in a matched manner; meanwhile, the bentonite adopts Na-bentonite with specific performance; by using the Na-bentonite with specific performance and the nano-iron, the persulfate can be effectively activated to generate more strong oxidizing SO4<.-> and .OH; and by using the SO4<.-> and the .OH, the trichloro ethylene is completely oxidized without generating dechlorination products with higher toxicity, such as 1,1-dichloroethylene,1,2-dichloroethylene or chloroethylene; therefore, the TCE removing rate in a DNAPL pollution source area is increased. Meanwhile, the Na-bentonite with specific performance can keep the stability ofpH of a reaction system in the trichloro ethylene removing process; therefore, an alkaline reagent does not need to be additionally added in the reaction process, and the pH value does not need to beadjusted. Tests show that the TCE removing rate reaches 74-76% within 6 days and reaches 94-100% within 50 days.

Description

technical field [0001] The invention belongs to the technical field of soil and groundwater pollution risk management and control, treatment and repair, and specifically relates to a medicament and method for synchronously fixing and reducing trichlorethylene in soil and / or groundwater, in particular to a combination of bentonite, nano-iron, and persulfate A medicament and a method for reducing trichlorethylene in soil and / or groundwater heavy non-aqueous phase liquid (dense non aqueous phase liquid, DNAPL) pollution source areas by using synchronous fixation. Background technique [0002] Trichloroethylene (TCE) is one of the volatile chlorinated organic compounds ubiquitous in soil and groundwater all over the world, and its pollution has become a worldwide environmental and health problem. According to incomplete statistics, high concentrations of TCE have been detected in the soil and groundwater of China, the United Kingdom, Japan, the United States, Belgium and other c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08C09K17/08E02D31/00
Inventor 黄国鑫童林林刘菲王夏晖李志涛
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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