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Polycyclic aromatic hydrocarbon degradation agent and preparation method

A technology of polycyclic aromatic hydrocarbons and degradation agents, applied in the field of polluted soil, can solve the problems of high cost, large dosage, and difficulty in guaranteeing the oxidation effect, and achieve the effect of reducing the pollution concentration and improving the oxidation efficiency

Active Publication Date: 2020-12-15
天津中正环境检测评价服务有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The chemical oxidants used to degrade polycyclic aromatic hydrocarbons are mostly single-component at present. Practice has proved that for a wide variety of polycyclic aromatic hydrocarbon components, the use of single-component oxidants has problems of large dosage, high cost, and difficulty in guaranteeing the oxidation effect. There is an urgent need to have Targeted improvement of oxidation efficiency

Method used

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  • Polycyclic aromatic hydrocarbon degradation agent and preparation method
  • Polycyclic aromatic hydrocarbon degradation agent and preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Example 1: A PAH-contaminated site was repaired with a composite oxidant, using an in-situ ex-situ method to mix the composite oxidant and soil through a mixer. The composite oxidant was calculated by weight, and the component A was 70 kg, and the component B was 30 kg. 21kg of sodium hypochlorite and 49kg of calcium hypochlorite in component A; 19.5kg of sodium persulfate, 7.5kg of potassium ferrate and 3kg of sodium hydroxide in weight percentage of each component in component B.

[0015] Prepare component A as a 3% by weight aqueous solution and store separately, and prepare component B as a 2% by weight aqueous solution as required and store separately. When in use, add and mix it in the mixer on site, make it fully mixed with the contaminated soil, and keep it stable for 20 days. After use, the typical polycyclic aromatic hydrocarbons in the contaminated soil decreased significantly. The comparison before and after remediation of five typical pollutants is shown i...

Embodiment 2

[0016] Example 2: A polycyclic aromatic hydrocarbon contaminated site is rehabilitated using a composite oxidant, using an in-situ ex-situ method, mixing the composite oxidant and soil through a mixer, the composite oxidant is by weight, A component 58kg; B component 42kg; The A component includes: calcium hypochlorite 10.44kg, calcium hypochlorite 47.56kg; B component includes: sodium persulfate 23.52kg, potassium ferrate 10.5kg, sodium hydroxide 7.14kg. The preparation method is the same as in Example 1, and the comparison before and after remediation of five typical pollutants is shown in Table 1.

Embodiment 3

[0017] Embodiment 3: a certain polycyclic aromatic hydrocarbon contaminated site is rehabilitated using a composite oxidant, adopting an in-situ ex-situ method, mixing the composite oxidant and soil by a mixer, the composite oxidant is by weight, A component 86kg; B component 14kg; wherein The A component includes: calcium hypochlorite 39.56kg, calcium hypochlorite 46.44kg; B component includes: sodium persulfate 10.64kg, potassium ferrate 2.66kg, sodium hydroxide 0.7kg. The preparation method is the same as in Example 1, and the comparison before and after remediation of five typical pollutants is shown in Table 1.

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Abstract

The invention belongs to the field of contaminated soil and particularly relates to a PAH (polycyclic aromatic hydrocarbon) degradation agent and a preparation method. A composite oxidant is preparedfrom components in parts by mass as follows: 58-86 parts of a component A and 14-42 parts of a component B, wherein the component A is prepared from substances in parts by mass as follows: 18-46 partsof sodium hypochlorite and 56-82 parts of calcium hypochlorite, and the component B is prepared from substances in parts by mass as follows: 58-76 parts of sodium persulfate, 19-25 parts of potassiumferrate and 5-17 parts of sodium hydroxide. With the adoption of the composite oxidant, five typical PAH contaminants in contaminated soil can be remarkably reduced, and contamination concentrationsof the contaminants are greatly reduced.

Description

technical field [0001] The invention belongs to the field of polluted soil, and in particular relates to a polycyclic aromatic hydrocarbon degradation agent and a preparation method. Background technique [0002] With the advancement of human industrialization, a large amount of fossil fuels are burned and used. At the same time, a variety of synthetic organic chemicals have also entered the environment. Persistent organic pollution represented by polycyclic aromatic hydrocarbons has become an issue that affects environmental quality, especially soil environmental quality. important factor. Polycyclic aromatic hydrocarbons (PAHs) refer to hydrocarbons containing two or more benzene rings. More than 150 kinds of PAHs have been found, and a considerable part of them are carcinogenic, such as benzoαpyrene, benzoαanthracene, etc., coal , petroleum, wood, organic macromolecular compounds, tobacco and many hydrocarbons can generate polycyclic aromatic hydrocarbons during incomple...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K17/06
CPCC09K17/06
Inventor 王勇洪静
Owner 天津中正环境检测评价服务有限公司
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