A medicament and method for synchronously fixing and reducing benzene in soil and/or groundwater

A groundwater and chemical technology, applied in chemical instruments and methods, restoration of polluted soil, soil conditioning materials, etc., can solve the problems of low benzene removal rate, large pH change, high permeability coefficient and service life of barrier walls, and achieve ecological Low environmental risk, improved thixotropic plasticity, significant technical and environmental effects

Active Publication Date: 2019-12-13
CHINA UNIV OF GEOSCIENCES (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] For this reason, what the present invention is to solve is that there are large pH changes, low benzene removal rate, barrier wall permeability coefficient and service life technology in the prior art in the process of fixedly reducing soil and / or groundwater light non-water-soluble phase liquid pollution source areas. Highly demanding defects, and then provide a medicament and method for synchronously fixing and reducing benzene in soil and / or groundwater

Method used

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  • A medicament and method for synchronously fixing and reducing benzene in soil and/or groundwater
  • A medicament and method for synchronously fixing and reducing benzene in soil and/or groundwater
  • A medicament and method for synchronously fixing and reducing benzene in soil and/or groundwater

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Embodiment 1

[0059] The present embodiment provides a kind of medicament for synchronously fixing and reducing benzene in soil and / or ground water, and this medicament comprises the montmorillonite of 4000g, the slag of 800g, the persulfate and water of 384g, the total mass of montmorillonite and slag and The mass ratio of water is 1:50; among them, the montmorillonite is Na-based montmorillonite, and the Na-based montmorillonite in Na-based montmorillonite + 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; The content is 2wt%, the content of potassium oxide is 0.5wt%, the pH is 9.5, and the particle size is 75 μm;

[0060] The surface of sodium-based montmorillonite in this embodiment is irregular polygon, smooth, and angular; it is mainly composed of oxygen, silicon, and aluminum and contains a small amount of sodium, potassium, iron, calcium, magnesium, etc., which is consistent with...

Embodiment 2

[0063] The present embodiment provides a kind of medicament for synchronously fixing and reducing benzene in soil and / or ground water, and this medicament comprises the montmorillonite of 4000g, the slag of 800g, the persulfate of 384g and water, the mass ratio of montmorillonite and water is 1:50; among them, the montmorillonite is Na-based montmorillonite, and the Na-based montmorillonite in Na-based montmorillonite + content is 2.6wt%, total organic carbon content is 13.7mg / L, pH is 10.6, particle size is 120μm, persulfate is potassium persulfate; slag is lignite slag, calcium oxide content in lignite slag is 40wt%, sodium oxide The content is 1.5wt%, the content of potassium oxide is 0.5wt%, the pH is 9.3, and the particle size is 75μm;

[0064] Simulate the application environment, apply the medicament in this embodiment to 10 mg / kg of benzene-containing soil, the specific application method is as follows: add the persulfate in the medicament to 10 mg / kg of benzene-contai...

Embodiment 3

[0066] Present embodiment provides a kind of medicament for synchronously fixing and reducing benzene in soil and / or ground water, and this medicament comprises the montmorillonite of 3500g, the slag of 850g, the persulfate of 350g and water, the total mass of montmorillonite and slag and The mass ratio of water is 1:55; among them, the montmorillonite is Na-based montmorillonite, and the Na-based montmorillonite in Na-based montmorillonite + Content is 2.5wt%, total organic carbon content is 14mg / L, pH is 10.3, particle size is 150μm, persulfate is sodium persulfate; slag is lignite slag, calcium oxide content in lignite slag is 41wt%, sodium oxide content 1 wt%, potassium oxide content 1 wt%, pH 9.0, particle size 120 μm;

[0067] Simulate the application environment, apply the medicament in this embodiment to 10mg / L groundwater containing benzene, the specific application method is as follows: add the persulfate and water in the medicament to the 10mg / L groundwater containi...

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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, montmorillonite, furnace slag, persulfate and water are adopted according to a specific mixing ratio in a matched manner; meanwhile, the montmorillonite adopts Na-montmorillonite with specific performance; by using the Na-montmorillonite with specific performance and the furnace slag, the persulfate can be effectively activatedto generate more strong oxidizing SO4<.-> and .OH; and by using the SO4<.-> and the .OH to completely oxidize benzene, the benzene removing rate in an LNAPL pollution source area is increased. Meanwhile, the Na-montmorillonite with specific performance can coordinate with the furnace slag in the benzene removing process to keep the stability of pH of a reaction system; therefore, an alkaline reagent does not need to be additionally added in the reaction process, and the pH value does not need to be adjusted. Tests show that the benzene removing rate reaches 93-98% within 15 days, the secondarypollution is less, the eco-environmental risk is small, the safety is high, and obvious advantages in technical property and environmental protection property are realized.

Description

technical field [0001] The invention belongs to the technical field of soil and groundwater pollution risk management and control, treatment and restoration, and specifically relates to a medicament and method for synchronously fixing and reducing benzene in soil and / or groundwater, and in particular to a combination of montmorillonite, slag and persulfate A medicament and method for simultaneously and fixedly reducing benzene in soil and / or groundwater light non-aqueous phase liquid (LNAPL) pollution source areas. Background technique [0002] Benzene is one of the volatile organic compounds ubiquitous in soil and groundwater worldwide, and its pollution has caused serious environmental and health problems. Benzene in soil and groundwater mainly comes from the leakage and seepage of equipment and facilities damaged in oil production, use, storage and transportation. For example, the sewage leakage of a production plant of Qilu Petrochemical Company caused the benzene conte...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/08C09K17/08E02D31/00
Inventor 童林林黄国鑫刘菲
Owner CHINA UNIV OF GEOSCIENCES (BEIJING)
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