Active soil gas collecting device and collecting method

Abstract

The invention discloses an active soil gas collecting device and collecting method. The active soil gas collecting device comprises a gas collecting bag, a gas sampling device, a filter, a nylon gas guiding pipe and a soil gas sucking and filtering device, wherein the gas sampling device is composed of a diaphragm pump, a regulating valve, a buffer, a flow meter, an electronic time-controlled circuit, an under-pressure indicating circuit, a power supply, a gas inlet and a gas outlet, wherein the soil gas sucking and filtering device consists of a fixed cylinder frame, a filter net, gravel, a nylon gas guiding pipe and a threaded pipe joint. When a soil gas is collected, the gas inlet pipe of the gas sampling device passes through the filter, and is connected with the nylon gas guiding pipe of the soil gas sucking and filtering device by virtue of a flexible through connection pipe, and the gas collecting bag is connected with the gas outlet pipe of the gas sampling device. The active soil gas collecting device can be used for collecting the soil gas in an existing monitoring cell, and can be distributed in soil of different depths according to a test requirement for collecting soil gases of different depth ranges, can be used for realizing long-term monitoring in the fixed-point soil, is simple in structure, high in soil gas collecting efficiency, and convenient and rapid to operate, and has a good effect.

Description

technical field [0001] The invention belongs to the field of site soil environment investigation and monitoring and soil gas collection, and in particular relates to a soil gas active collection device and a method for collecting soil gas. Background technique [0002] At present, there are not many studies on the monitoring of volatile organic pollution in soil in my country, especially the lack of strict quality control index system for the whole process of monitoring and collection of volatile organic compounds in in situ soil gas. 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 content in soil gas. 2 , O 2 Therefore, the monitoring process of VOC content in soil requires more effective soil gas collection devices. [0003] Accurate collection of soil gas samples is the key to the study of CO in soil gas 2 , O 2 Based on the premise ...

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Problems solved by technology

[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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