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In-situ thermal desorption system, in-situ thermal desorption-oxidation repair system and repair method

An oxidative remediation and thermal desorption technology, applied in the restoration of polluted soil, etc., can solve the problems of high technical energy consumption and low heat utilization rate, and achieve the effect of large heating area, small equipment volume and cost reduction.

Active Publication Date: 2020-07-31
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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Problems solved by technology

However, in-situ thermal desorption technology has high energy consumption and low heat utilization rate, and chemical oxidation technology will produce other by-products, such as dioxins produced during the treatment of chlorinated organic substances

Method used

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  • In-situ thermal desorption system, in-situ thermal desorption-oxidation repair system and repair method

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Embodiment 1

[0065] A VOC polluted site, the pollutants are mainly petroleum hydrocarbons and polycyclic aromatic hydrocarbons. Through the preliminary site investigation, the scope of the polluted soil is clarified. The area of ​​the polluted site is 1500m2, and the pollution depth is 10.5m, of which the soil pollution depth is 8.0m, and the polluted groundwater depth is 2.5m. The heating inclined well with a vertical direction of 60°, the external filler of the heating inclined well is zeolite and gravel with good thermal conductivity. Pore ​​material, the opening density is set to be 5 times that of the lower part of the upper part, the construction of the extraction well is 6.2m, the catalyst selected for the thermocatalytic oxidation reaction chamber is a noble metal catalyst loaded on ceramic honeycomb coal containing 0.5% Pd, and the solar photovoltaic module passes through the air The heater heats the air to 200°C, and its design and construction are completed according to the devi...

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Abstract

An in-situ thermal desorption system, an in-situ thermal desorption-oxidation repair system and a repair method, the in-situ thermal desorption system includes a heating device and an extraction device, and the heating device transports heated air to polluted soil for use The organic pollutants are desorbed, and the extraction device sucks the desorbed organic pollutants. The in-situ thermal desorption-oxidation repair system adds a thermal catalytic oxidation device on the basis of the in-situ thermal desorption system. The organic pollutants extracted by the extraction device are catalytically degraded in the thermal catalytic oxidation device, further adding a tail gas resource recovery reprocessing device. The invention also provides an in-situ thermal desorption-oxidation repair method. The heating method of the present invention is novel, which reduces the cost of thermal desorption; strengthens the heating area of ​​the site, improves the heating efficiency, and further enhances the thermal catalytic oxidation efficiency; Utilization, no secondary waste gas is generated.

Description

technical field [0001] The invention belongs to the technical field of remediation of organic polluted soil and groundwater, and in particular relates to an in-situ thermal desorption system, an in-situ thermal desorption-oxidation remediation system and a remediation method. Background technique [0002] In recent years, with the acceleration of urbanization and industrial transfer in our country, enterprises in economically developed areas have been relocated or closed down. Among them, there are many high-polluting enterprises such as chemical factories, pharmaceutical factories, paper mills and electroplating factories, leaving behind a lot of complex These sites are basically used as residential land, public facilities construction land, and green land, which are very harmful to human health, environmental safety, and social stability. [0003] At present, the organic pollutants in the soil of the polluted site are mainly petroleum hydrocarbons, pesticides, polycyclic a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/06B09C1/08B09C1/00
CPCB09C1/002B09C1/065B09C1/08B09C2101/00B09C1/06
Inventor 姜永海杨昱廉新颖徐祥健杨鹊平夏甫马志飞
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI
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