Method for treating organic contaminated soil through thermal desorption

A technology of organic pollution and thermal desorption, which is applied in the field of soil remediation of contaminated sites, can solve the problems that dioxins cannot effectively eliminate energy consumption, and achieve the effects of avoiding heat loss and waste, reducing water content, and efficient energy utilization

Active Publication Date: 2020-08-18
SHANGHAI RES INST OF CHEM IND
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Problems solved by technology

[0009] The purpose of the present invention is to provide a method for thermal desorption treatment of organic polluted soil, to solve the problems that dioxins cannot be effectively eliminated and / or energy consumption is relatively large

Method used

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  • Method for treating organic contaminated soil through thermal desorption

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Effect test

Embodiment 1

[0056] Select polluted soil containing an average of 785 mg / kg of polycyclic aromatic hydrocarbons. After pretreatment such as crushing and sieving, the thermal desorption temperature is controlled at 500 ° C, and the negative pressure is 1000 Pa. The anaerobic state stays in the thermal desorption furnace for 1 Hours, the flue gas from thermal desorption is burned at a high temperature of 1300°C, the content of polycyclic aromatic hydrocarbons in the treated soil is 2.8mg / kg, the removal and destruction efficiency reaches 99.6%, and the content of benzo(a)pyrene in the flue gas is 0.05μg / kg m 3 , which is less than the limit of 0.3μg / m3 in the "Comprehensive Emission Standard of Air Pollutants" 3 .

Embodiment 2

[0058] The original soil polluted by PCBs was selected. The total content of PCBs in the soil was 4374 μg / g, mainly dichlorobiphenyls, trichlorobiphenyls and tetrachlorobiphenyls, and the three accounted for 94% of the total. After pretreatments such as crushing and sieving, the temperature of thermal desorption is controlled at 550°C. Under the protection of nitrogen, the thermal desorption is carried out at normal pressure, and the residence time in the thermal desorption furnace is 50 minutes. The room temperature is 1300°C, the PCB content in the soil after treatment is 45.6μg / g, and the removal efficiency is 98.9%, which is lower than the minimum disposal standard of 50μg / g required by GB13015-91.

Embodiment 3

[0060] Dichlorvos, omethoate and parathion are the main pollutants in the polluted soil of the pesticide factory, among which the content of dichlorvos is 5.96 μg / g, omethoate 5.45 μg / g and parathion 130 μg / g, after pretreatment such as crushing and sieving , at 350°C operating pressure -500Pa, anaerobic thermal desorption of polluted soil, the flue gas from thermal desorption is burned at a high temperature of 1300°C, the desorption rates are 95.2%, 96.4%, 98.9%, respectively, and the residual dichlorvos in purified soil is 0.28μg / g, omethoate 0.20, parathion 1.43μg / g, non-methane total hydrocarbons in flue gas 32.6mg / m3, benzo(a)pyrene 0.12μg / m 3 , the residual amount of organochlorine pollutants and the emission concentration of flue gas after purification meet the limit requirements of pollutant emission standards.

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Abstract

The invention relates to a method for treating organic contaminated soil through thermal desorption. The method comprises the following steps: (1) crushing, sieving and drying organic contaminated soil, sending the organic contaminated soil into a thermal desorption furnace for thermal desorption to obtain repaired soil and desorption gas, cooling the repaired soil to complete the treatment, removing dust from the desorption gas, and sending the desorption gas into a combustor for combustion; (2) feeding the high-temperature flue gas discharged from the combustor into the thermal desorption furnace as a heat source to heat the organic contaminated soil to obtain low-temperature flue gas; and (3) carrying out heat exchange between the obtained low-temperature flue gas and combustion-supporting air fed into the combustor, treating the low-temperature flue gas by a flue gas treatment system, and discharging the flue gas after the flue gas meets the standards. The energy utilization rate is increased, the soil is repaired, and secondary pollution is avoided.

Description

technical field [0001] The invention belongs to the technical field of soil remediation of polluted sites, and relates to a method for thermal desorption treatment of organic polluted soil. Background technique [0002] With the rapid development of my country's national economy, the problem of soil pollution caused by various organic pollutants produced by oilfield exploitation, pesticide use and industrial production is extremely serious. Soil organic pollution sources mainly come from three aspects: organic solvents, petroleum hydrocarbons, pesticides, etc. Pesticide pollution in farmland soil causes pesticide content in various crops to exceed the standard, and is enriched into animals and humans through the food chain, seriously endangering the health and safety of humans and animals. [0003] At the same time, with the expansion of the city scale, the factory areas left by the relocation of the production enterprises have been polluted to varying degrees; the oil hydr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/06F23G7/06
CPCB09C1/065F23G7/065
Inventor 李泓李森唐俊杰张杨张宏玲徐思遥宋一帆许明言殷曰彩陈杲
Owner SHANGHAI RES INST OF CHEM IND
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