Polluted soil surfactant enhanced aeration test device and test method

Abstract

The invention provides a surfactant enhanced aeration test device and a test method, which belong to the technical field of environmental geotechnical engineering. The method can be used for conventional aeration, enhanced aeration by integrally injecting the surfactant and enhanced aeration by locally injecting the surfactant. A main device comprises a test box, a sample layer, a coarse sand layer, an adsorption layer, a partition plate, a peristaltic pump, a water tank and the like. In the test process, VOCs can be adsorbed by controlling the injection positions of different surfactants and activated carbon in the adsorption layer in the test box, and the repair efficiency of conventional aeration, overall surfactant injection enhanced aeration and local surfactant injection enhanced aeration is quantitatively evaluated. And the influence of the surfactant injection position on the airflow mode, the pollutant removal efficiency and the airflow path control is further studied. The test device and the test method have important engineering practical significance and theoretical research value for expansion and application of the technical range of the aeration method.

Description

technical field [0001] The invention relates to the technical field of environmental geotechnical engineering, in particular to a test device and a test method for intensified aeration of surfactants in polluted soil. Background technique [0002] In today's world, with the further advancement of industrialization, soil environmental problems are becoming more and more serious. Among many soil problems, volatile organic compounds (VOCs) such as petroleum hydrocarbon pollutants and organic chlorinated solvents are ubiquitous in petroleum and chemical polluted sites, and have become the main toxic pollution with high potential danger in urban polluted sites in my country. one of the things. Due to its advantages of low cost, high efficiency, in-situ operation, and environmental friendliness, aeration remediation technology has become an effective method for disposing of volatile organic pollutants in saturated soil and groundwater. However, due to the complexity and heterogen...

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Problems solved by technology

[0005] 1. In the process of implementation, the surfactant injection position cannot be changed according to the distribution of soil organic pollution in the field. The distance deviation between the surfactant injection position and the pollution source will reduce the effect of the surfactant. This defect determines the method not being able to achieve optimum economic efficiency;

[0006] 2. This method is an outdoor test, and the effect of surfactants on the airflow path, mobility control, and VOCs removal efficiency cannot be directly observed. This defect determines that this method cannot quantitatively analyze the pollutant removal effect and study surfactant enhancement. Aeration mechanism;

[0007] 3. This method is limited to low-permeability polluted sites, that is, the environmental adaptability is not strong

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