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A kind of trichlorethylene polluted soil oxidizer and its preparation and use method

A technology of polluted soil and trichlorethylene, which is applied in the field of remediation of trichlorethylene-contaminated soil, can solve problems such as slow reaction rate, and achieve the effect of low cost, low cost and easy biodegradation

Inactive Publication Date: 2011-12-14
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because sodium persulfate is too stable, the reaction rate is slow at room temperature, and it is necessary to improve the oxidation capacity through activation. Therefore, it is of great practical significance to develop an environmentally friendly, efficient and economical sodium persulfate oxidation technology.

Method used

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  • A kind of trichlorethylene polluted soil oxidizer and its preparation and use method
  • A kind of trichlorethylene polluted soil oxidizer and its preparation and use method
  • A kind of trichlorethylene polluted soil oxidizer and its preparation and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Example 1: Comparison of the removal effect of medicament ratio and concentration combination

[0024] 1. Under the condition of soil sample TCE pollution concentration of 100mg / kg, it is designed to use Na 2 S 2 O 8 Concentration, FeSO 4 Concentration, CA concentration, and reaction time are a 4-factor 3-level orthogonal test (see Table 1). The concentration of each component, that is, the experimental design concentration, is the concentration of the oxidizer and the activator mixed.

[0025] 2. Weigh Na 2 S 2 O 8 Dissolve into Na with a concentration of 1.2~3.6g / L in tap water 2 S 2 O 8 Solution, as oxidant; also called FeSO 4 ·7H 2 O and CA, dissolved in tap water to form FeSO 4 -CA mixed solution, the two concentrations in the mixed solution are respectively 0.7~2.8g / L and 0.1~0.5g / L, as activator.

[0026] 3. Weigh 10g of spare soil sample (TCE concentration is 100mg / kg) into a 100mL centrifuge tube, add FeSO 4 -CA mixed solution 15mL, shake well, add Na 2 S 2 O 8 The sol...

Embodiment 2

[0034] Example 2: Na 2 S 2 O 8 -FeSO 4 -The removal effect of CA oxidizer on soil with different TCE contaminated concentration

[0035] 1. Weigh Na according to the best conditions determined in Example 1 2 S 2 O 8 , Dissolved in tap water to a concentration of 2.4g / L Na 2 S 2 O 8 Solution; also called FeSO 4 ·7H 2 O and CA, dissolved in tap water to form FeSO 4 -CA mixed solution, the two concentrations are 1.4g / L and 0.1g / L respectively.

[0036] 2. Weigh 10g of spare soil sample (TCE concentration is 30~480mg / kg) into a 100mL centrifuge tube, add FeSO 4 -CA mixed solution 15mL, shake well, add Na 2 S 2 O 8 The solution was 15 mL, so that the final concentration of each agent reached the best condition in Example 1. The reaction flask was placed in a shaker and shaken at a speed of 300 r / min, protected from light, and the temperature was constant at 25°C. Simultaneous blank processing and 3 replicate samples. Sampling was taken at the time of the experimental design, and the TCE...

Embodiment 3

[0039] 1. Preparation of medicine

[0040] Weigh Na 2 S 2 O 8 , Use tap water to dissolve to a concentration of 1.2g / L and a volume of 1L as an oxidant; also weigh FeSO 4 ·7H 2 O and CA are dissolved in tap water to form a mixed solution, the concentrations of the two are 0.7g / L and 0.1g / L, and the volume is 1L, as activators.

[0041] 2. Oxidation of soil column: The column body is made of a PVC pipe with a length of 50cm and an inner diameter of 7.5cm through a wire mesh and glass fiber backing. The soil density in the column is 1.4g / cm 3 , The height of the soil column is 40cm, and the TCE concentration is 300mg / kg. The activator and the oxidant are uniformly injected from the upper end of the soil column at the same time, the flow rate is about 0.30mL / min, the total injection volume is 2L, and the lower end of the soil column is drained. 2 duplicates. After the oxidation, the TCE concentration in the soil was measured, and the removal rate was 91.3%.

[0042] Compared with the...

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Abstract

The invention discloses an oxidizer for trichlorethylene polluted soil, a preparation method and a use method thereof. The medicament includes an oxidant and an activator; the oxidant is a sodium persulfate solution with a mass volume ratio of 1.2 to 2.4 g / L; the activator is a ferrous sulfate heptahydrate solution with a mass volume ratio of 0.7 to 1.4 g / L and a mass of A citric acid solution with a volume ratio of 0.1g / L. The use method of the medicament comprises the following operation steps: simultaneously injecting the oxidant and the activator into the soil polluted by trichlorethylene, or injecting the activator first and then injecting the oxidant, and the volume ratio of the activator and the oxidant is 1:1. The invention has remarkable medicament removal effect, low cost and environmental friendliness.

Description

Technical field [0001] The invention belongs to the field of remediation of trichloroethylene contaminated soil, and particularly relates to an oxidizing agent for trichloroethylene contaminated soil, and a preparation method and use method thereof. Background technique [0002] Trichloroethylene (TCE) is a volatile organic compound that can be absorbed through the respiratory tract, digestive tract and skin, and is a toxic carcinogen. As an important chlorinated solvent, it is widely used in metal processing, electronics, dry cleaning, electroplating, organic synthesis and other industries, and has become one of the main pollutants in soil and groundwater organic pollution. Once soil is contaminated by TCE, it will not only destroy the physical and chemical properties of the soil and cause harm to crops, but also will form a cumulative effect with the shift of the food chain, posing a huge threat to human health. Because it is easy to migrate and difficult to degrade, it has a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/40B09C1/08C09K101/00
Inventor 蔡信德吴嘉怡韩蕊李诗殷杜文婷
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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