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Thermal desorption dynamic testing method of complex pollution source VOCs in soil

A test method and thermal desorption technology, applied in the field of thermal desorption kinetics of VOCs from complex pollution sources in soil

Active Publication Date: 2019-06-21
苏州市环境科学研究所 +3
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the actual polluted soil, such as various abandoned chemical plants, pharmaceutical factories and other abandoned sites, there are often many kinds of VOCs in the soil at the same time. Due to the different physical and chemical properties of different types of VOCs, in many Under the superposition of various factors and the joint influence of multiple chemical substances (VOCs), the mass loss rate (-dm / dt)-t curve of thermal desorption of complex pollution sources VOCs in soil obtained by this method is higher than that in the case of single VOC in soil The mass loss rate (-dm / dt)-t curve is much more complicated, and in some cases, the above-mentioned smooth straight line segment does not even appear, and the method recorded in the invention patent filed on the same day cannot continue to be used. For complex VOCs thermal desorption kinetics test in soil, it is necessary to propose a new test method for this complex situation

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  • Thermal desorption dynamic testing method of complex pollution source VOCs in soil
  • Thermal desorption dynamic testing method of complex pollution source VOCs in soil

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Embodiment Construction

[0051] In order to facilitate the understanding of the present invention, the technical solution of the present invention will be specifically introduced below in conjunction with examples.

[0052] Collect a certain amount of clean soil samples, place them in the liquid-phase complex VOCs to be tested (polychlorinated biphenyls (PCBs), ethylene glycol, cyclohexane mixed solution) and soak until saturated; Divide the polluted soil sample into multiple soil sub-samples; the mass ratio of polychlorinated biphenyls (PCBs), ethylene glycol, and cyclohexane is 20:13:5;

[0053] Collect 100g of clean soil sample, put it in the liquid phase complex VOCs to be tested and soak for several hours until soaked; divide the polluted soil sample into multiple soil sub-samples;

[0054] Fill an aliquot of soil into an open container, then transfer the open container containing the soil sample into a tube that is open at both ends;

[0055] The air is blown into the pipe to sweep the soil sam...

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Abstract

According to the invention, a soil sample mass m is monitored and recorded in real time; a mass loss rate curve of the soil sample is obtained; and the analysis is carried out to obtain VOCs thermal desorption kinetic parameters. Therefore, problems that the thermal desorption process is complicated and can not be analyzed and studied easily under the joint influences of various superposed factorsand various VOCs on the condition of simultaneous existence of various VOCs in soil are solved. On the basis of repeated and interactive attempting of two parameters including the air flow rate and soil heating temperature, appropriate and economical values can be obtained. With the provided method, the kinetic processes of the VOCs at the two stages of thermal desorption of in soil can be clearly studied and distinguished and fitting is carried out to obtain relevant parameters, so that the useful parameters and guidance are provided for the VOCs-contaminated soil under thermal desorption treatment.

Description

technical field [0001] The invention relates to a test method for organic pollutants, in particular to a test method for thermal desorption kinetics of complex pollution sources VOCs in soil. Background technique [0002] VOCs (volatile organic compounds) refer to organic compounds with a saturated vapor pressure greater than 133.32Pa at normal temperature and a boiling point below 50-260°C at normal pressure, or any organic solid or liquid that can volatilize at normal temperature and pressure. VOCs is a general term for a class of compounds with very complex compositions, including hundreds of compounds such as alkanes, alkenes, halogenated hydrocarbons, aromatic hydrocarbons, and aldehydes and ketones. VOCs in soil cover some of the above-mentioned organic substances, including halogenated hydrocarbons, aromatic hydrocarbons, etc. These VOCs generally have the characteristics of environmental accumulation, bioaccumulation, and high toxicity. [0003] Thermal desorption ...

Claims

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Application Information

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IPC IPC(8): G01N5/04
Inventor 许伟施维林蔡慧陈洁贺志刚孟宪荣
Owner 苏州市环境科学研究所
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