System and method for purifying organic contaminated soil by using in-situ thermal desorption of combustion hot air

Abstract

The invention relates to a system and method for purifying organic contaminated soil by using in-situ thermal desorption of combustion hot air. A circulation purification system comprises a heating unit, a collection unit, a negative pressure fan, a heat exchange unit, a combustion purification unit, a positive pressure fan and a combustion unit; the heating unit is inserted in organic contaminated soil, the top of the heating unit is flush with the surface of the organic contaminated soil and a screen is arranged thereon, and a collecting unit is arranged above the heating unit; the combustion unit is one-to-one correspondingly connected with the heating unit via a hot air pipe, and the combustion unit is connected to a positive pressure fan; the collection unit is connected to a negativepressure fan, and the negative pressure fan, the combustion purification unit and the positive pressure fan are respectively connected with the heat exchange unit. The system and method for purifyingorganic contaminated soil by using in-situ thermal desorption of combustion hot air can realize in-situ high-efficiency purification of the organic contaminated soil, reliable operation, low investment operation cost, and long service life.

Description

technical field [0001] The invention relates to the technical field of remediation of organic polluted soil, in particular to a system and method for purifying organic polluted soil by in-situ thermal desorption using hot combustion air. Background technique [0002] With the continuous improvement of urban industrialization level, a large number of petrochemical, coal chemical and other organic chemical enterprises are constantly rising. During the production process of these enterprises, a large number of toxic and harmful chemicals will inevitably enter the soil environment, causing soil pollution; soil pollution Pollutants enter the human body through food, breathing, etc. and threaten human health; therefore, it is imperative to restore polluted soil. [0003] At present, the main soil remediation technology is ectopic incineration remediation technology: the contaminated soil is dug out and put into an incinerator for high-temperature incineration. However, this soil ...

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Problems solved by technology

However, this soil remediation technology has disadvantages such as high remediation cost, high energy consumption, and large transportation volume, and is especially not suitable for remediation of large areas of organically polluted soil.

In-situ thermal desorption technology has appeared in recent years, but there are still many shortcomings. For example, if the extraction device is used to collect organic pollutants, the air hole will be blocked after the extraction device runs for a period of time and the exhaust will be affected; the surface of the contaminated soil is sealed with cement. Inhibit the escape of organic pollutants but cause new pollution to the soil; the method of making underground roadways in deep soil not only increases the project cost but also makes the construction very difficult

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