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A soil gas active collection device and collection method
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A soil gas and collection method technology, which is applied to sampling devices and other directions, can solve the problems of limited collection depth, complicated operation, and difficult installation, etc., and achieves the effects of easy material, simple and convenient operation, and cost saving.
Active Publication Date: 2018-01-05
INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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[0005] The purpose of the present invention is to provide a soil gas active collection device and its collection method, to solve the technical problems of the existing soil gas collection equipment and methods such as limited collection depth, complicated operation, time-consuming and labor-consuming, and difficult installation.
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Embodiment example 1
[0035] Implementation case 1: The present invention has been used for soil gas collection in an ex-situ biopile remediation system of a diesel leakage contaminated site. According to the distribution of pollutants in the soil of the site, the volume is 160m 3 8 soil gas sampling points are set up in the biopile, each sampling depth is 0.5m, 1.0m and 1.5m. In the whole process (60 days) of using the biological ventilation system to remediate diesel-contaminated soil, soil gas at different depths of soil sites can be collected every day for determination of volatile organic pollutant content, and the concentration range of volatile gas in the collected soil is: 0-718mg / L, judge the distribution characteristics of volatile organic pollutants in the soil over time, and visually display the removal of pollutants in the soil.
Embodiment example 2
[0036] Implementation case 2: The present invention has been applied to soil gas collection in the thermally enhanced soil gas phase extraction process of a chlorobenzene-contaminated site in a chemical plant. According to the pollutant distribution characteristics of the site and the design of the remediation system, 5 sampling points were designed in the site with a sampling depth of 7m underground. Regularly collect soil gas for the determination of chlorobenzene content. The concentration range of volatile gas in the collected soil is: 40-200mg / L. According to the change of the pollutant concentration in the soil gas, it can effectively guide the improvement of the remediation system and monitor the pollutants in the soil gas. The reduction law of extraction time and extraction rate.
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Abstract
The invention discloses a soil gas active collection device and a collection method, comprising a gas collection bag, a gas sampling device, a filter, a nylon air guide tube, and a soil gas suction and filtration device. The gas sampling device is composed of a diaphragm pump, a regulating valve, a buffer, a flow meter, an electronic time control circuit, an undervoltage indicating circuit, a power supply, an air inlet and an air outlet, and the like. The soil gas suction and filtration device is composed of a fixed cylinder holder, a filter screen, gravel, a nylon air guide pipe, and a threaded pipe joint. When collecting soil gas, the air inlet pipe of the gas sampling device passes through the filter, and is connected to the nylon air guide pipe of the soil gas suction filter device through an adapter hose, and the gas collection bag is connected to the outlet pipe of the gas sampling device. This device can collect soil gas in existing monitoring wells, and can also be arranged in soil at different depths according to test requirements, used to collect soil gas in different depth ranges, and can realize long-term monitoring in fixed-point soil. The structure is simple, and the soil gas The collection efficiency and effect are good, and the operation is convenient and quick.
Description
Technical field [0001] The invention belongs to the field of site soil environmental investigation and monitoring and soil gas collection, and specifically relates to a soil gas active collection device and a method for collecting soil gas. Background technique [0002] At present, there are not many researches on the monitoring of volatile organic pollution in soil in our country. Especially for the whole process of monitoring and collecting volatile organic compounds in in-situ soil gas, there is a lack of strict quality control index system. The content of volatile organic compounds in soil is small and the soil The gas is volatile, and the degradation of volatile organic compounds by soil microorganisms will affect the CO in the soil gas 2 , O 2 Therefore, the monitoring process of the content of volatile organic compounds in the soil requires more effective soil gas collection devices. [0003] Accurate collection of soil gas samples is to study CO in soil gas 2 , O 2 In addit...
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Application Information
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Patent Type & Authority Patents(China)
IPC IPC(8): G01N1/24
Inventor 廖晓勇阎秀兰马栋
Owner INST OF GEOGRAPHICAL SCI & NATURAL RESOURCE RES CAS
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