Method for soil remediation and engineering

A soil restoration and soil technology, which is applied in the field of soil restoration and engineering, can solve the problems of complex process and high energy consumption, and achieve the effect of improving engineering properties and reducing environmental impact

Inactive Publication Date: 2007-09-12
布赖顿大学 +1
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Problems solved by technology

Most of these technologies are complex, energy-intensive, and suitable for removing 90% or more of specific pollutants in each specific field or under laboratory-based conditions

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  • Method for soil remediation and engineering
  • Method for soil remediation and engineering
  • Method for soil remediation and engineering

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Embodiment Construction

[0032] Pilot studies were carried out in open-topped perspex chambers with laboratory scales of 25 x 2 x 15 cm and 30 x 50 x 40 cm (ie valid in two and three dimensions). All experiments were run at <5 volts using sacrificial cast iron electrodes. The electrodes were fabricated from 25 mm diameter cast iron rods (grade 250) of composition: 3.48% C, 2.87% Si, 0.812% Mn, 0.099% S, 0.364% P and the balance Fe. Tests were performed on various contaminated slurries, using groundwater and seawater pore water, under unsaturated and saturated conditions. Time scales range from 3 to 400 hours.

[0033] During the test using sand, the initial permeability of the sand was 0.48×10 -5 m / s, the permeability recorded after treatment (in the iron belt) is 0.19×10 -5 m / . For mud tests, the initial permeability is usually 0.29×10 -7 , while the recorded permeability of the treated material (in the iron strip) is 10 -9 Or less, that is, practically impermeable. In addition, clear dehydrat...

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Abstract

An electrokinetic method for groundwater protection, soil remediation and engineering which comprises applying an electric field across an area of soil, sediment or slurry so as to generate a pH and Eh gradient and thereby promote the in situ precipitation of a stable iron-rich band. The method may be performed for the purpose of stabilisation and / or strategic dewatering / rewatering of soils, sediment and / or slurries, the improvement of the physical properties of soils and sediments for engineering purposes, the forced and directed migration of contaminated leachates, and / or electro-osmotic purging of non-polar contaminants.

Description

technical field [0001] The present invention relates to an electrokinetic method for groundwater protection, soil restoration and engineering, and, more particularly, to a method involving the electrokinetic placement of iron-rich barriers in critical soils, sediments and slurries. Background technique [0002] Contaminated soil and groundwater at industrial, waste disposal and dump sites are serious environmental problems. Although clays and silts tend to chelate large quantities of heavy metals, radionuclides, and selected organic pollutants (Kovalick 1995), due to their low permeability coefficients, they are relatively unsuitable for restoration using conventional processes (e.g. , suction and disposal, soil washing) are resistant. This has stimulated extensive research into cost-effective, in-situ techniques that can be used to restore low-permeability, high-clay content soils. One emerging technique that has received a lot of attention is electrokinetic recovery. El...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08
CPCB09C1/085
Inventor 安德鲁·布赖恩·库蒂劳伦斯·詹姆斯·霍普金森
Owner 布赖顿大学
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