Engineering optimization method for horizontally blocking and resisting organic gas erosion

Abstract

The invention discloses an engineering optimization method for horizontally obstructing and resisting organic gas erosion, which comprises a horizontal obstructing system, and the horizontal obstructing system is sequentially provided with a polluted soil layer, a compacted clay layer, a geosynthetic clay liner, a first geomembrane, a modified asphalt layer, a second geomembrane, a temperature control layer, a protective layer, surface soil and vegetation from bottom to top. By adding the attapulgite, the water retention capacity of the compacted clay layer is improved, and the situation that due to water loss and cracking of the clay layer, organic gas is diffused through cracks is prevented; by laying a geosynthetic clay liner, the anti-seepage and gas-barrier performance is enhanced, and meanwhile, the geomembrane is protected from being influenced by medium-coarse sand and gravel; the two layers of geomembranes formed by bonding the modified asphalt provide a layer of complete membrane structure for the horizontal blocking system, and diffusion of water, organic gas and chemical steam is prevented; the temperature control layer is arranged on the surface of the geomembrane, so that the influence of overground temperature on the soil body can be effectively isolated, and the soil body is prevented from cracking due to water evaporation.

Description

technical field [0001] The invention relates to the technical field of control and treatment of polluted sites, in particular to an engineering optimization method for horizontal barrier resistance to organic gas erosion. Background technique [0002] With the progress of society and economy, industry and agriculture continue to develop, and at the same time, the problem of soil pollution is becoming more and more serious. Compared with agricultural land pollution, urban industrial pollution has a greater degree of pollution, complex pollution components, and deep pollution. Large, my country's urban industrial pollution can be divided into four categories, including persistent organic pollutants (POPs) polluted sites, organic polluted sites from petroleum, chemical, coking, etc., electronic waste polluted sites, and heavy metal polluted sites. Among them, organic pollutants It accounts for a large proportion of urban industrial pollution. [0003] In the treatment of organic...

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Problems solved by technology

[0004] Based on the technical problems existing in the background technology, the present invention aims to solve the problem of organic gas diffusion and migration caused by dehydration and cracking of the compacted clay layer, dehydration and cracking of the geosynthetic clay liner, and damage to the geomembrane during the actual construction of the horizontal barrier system. A solution to a common engineering problem is proposed. First, the invention solves the problem of dehydration and cracking of the compacted clay layer under direct sunlight. Second, the invention solves the problem of dehydration and drying of the geosynthetic clay liner under a temperature gradient. The third is that the present invention solves the problem that the geomembrane is prone to damage during the construction process and organic pollutants can diffuse and migrate through the geomembrane. Based on the above problems, the present invention proposes a horizontal barrier against organic gas erosion. Optimization

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