Method for remediation of volatile organic compound and mercury compound contaminated soil

A technology for volatile organic compounds and complex pollution, applied in the field of soil pollution remediation, can solve the problems of low remediation efficiency, long treatment cycle, incomplete removal, etc., and achieve high removal efficiency, low difficulty, good economic and environmental benefits Effect

CN105710123AActive Publication Date: 2016-06-29博川环境修复(北京)有限公司
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2016-06-29

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Abstract

The invention relates to a method for remediation of volatile organic compound and mercury compound contaminated soil, and belongs to the technical field of soil contamination remediation. The method comprises the steps that the contaminated soil is firstly excavated out of a contaminated land parcel, and breaking and screening treatment is carried out; then ferric chloride powder is added into soil particles according to the proportion of 1 g / kg-10 g / kg, after even mixing and stirring are carried out, vacuum heat treatment is carried out, the temperature is firstly controlled to range from 250 DEG C to 300 DEG C, and mercury and a small quantity of volatile organic compounds in the soil particles are removed; then the temperature is controlled to range from 500 DEG C to 600 DEG C, the volatile organic compounds in the soil are removed, and condensed air is supplied into the atmosphere through a vacuum pump; and the treated clean soil is taken out of a vacuum reactor. According to the method, remediation of the volatile organic compound and mercury compound contaminated soil is achieved, and the technological process is simple, efficient and free of secondary contamination.
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Description

Technical field:

[0001] The invention relates to the technical field of soil pollution remediation, in particular to a method for remediating volatile organic compounds and mercury compound polluted soil. technical background:

[0002] Soil organic pollution has gradually become the focus of public attention. Volatile organic compound pollution is disgusting because of its strong toxicity. Among them, volatile organic compounds pollute groundwater and soil are the most common. Many studies have shown that volatile organic compounds have carcinogenic, teratogenic and mutagenic effects on mammals and humans after entering the animal body. Severe soil pollution can cause some components of organic matter to accumulate in food and endanger human health through the food chain. At present, the volatile organic pollutants-heavy metal compound pollution in the soil is very common. The dumping of sludge and industrial waste residue from sewage treatment plants has caused a large a...

Examples

Embodiment 1

[0022] 1. Take 10kg of halogenated hydrocarbon and chromium composite polluted soil, and test the total volatile organic compounds and total mercury content; through crushing and screening, soil particles with good dispersion are obtained, with a particle size range of 1-15mm;

[0023] 2. Add ferric chloride to the soil particles at a ratio of 10g / kg; open the top cover of the reactor, put the soil particles into the closed reactor, open the No. 1 and No. 3 valves, close the No. 2 valve, and keep the vacuum The pressure of the reactor is 30Pa, the temperature of the reactor is controlled at 250°C by external heating, the temperature of the water cooler is controlled at 20°C, the motor is started to stir the soil, the treatment time is 5min, the mercury and a small amount of volatile organic compounds in the soil are passed through After the water cooler is cooled, it enters the mercury separator and is collected;

[0024] 3. Open the No. 2 valve, close the No. 1 and No. 3 valv...

Embodiment 2

[0029] 1. Take 10kg of halogenated hydrocarbon and chromium composite polluted soil, and test the total volatile organic compounds and total mercury content; through crushing and screening, soil particles with good dispersion are obtained, with a particle size range of 1-15mm;

[0030] 2. Add ferric chloride to the soil particles at a ratio of 5g / kg; open the top cover of the reactor, put the soil particles into the closed reactor, open the No. 1 and No. 3 valves, close the No. 2 valve, and keep the vacuum The pressure of the reactor is 20Pa, the temperature of the reactor is controlled at 300°C by external heating, the temperature of the water cooler is controlled at 20°C, the motor is started to stir the soil, the treatment time is 10min, the mercury and a small amount of volatile organic compounds in the soil are passed through After the water cooler is cooled, it enters the mercury separator and is collected;

[0031] 3. Open the No. 2 valve, close the No. 1 and No. 3 valv...