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A method for degrading polycyclic aromatic hydrocarbons in soil by mechanochemical method
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A mechanochemical method and polycyclic aromatic hydrocarbon technology, applied in the field of soil remediation, can solve the problems of long repair time and high cost of chemical repair technology, and achieve the effect of reducing repair time, excellent overall economy and low cost
Active Publication Date: 2022-03-04
陕西地建土地工程技术研究院有限责任公司
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Problems solved by technology
[0007] The purpose of the present invention is to solve the problems of high cost and long repair time of the existing chemical repair technology, and provide a method for degrading polycyclic aromatic hydrocarbons in soil by mechanochemical method, which has low degradation cost and is also environmentally friendly , convenient and efficient features
Method used
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Embodiment 1
[0029] The method for degrading polycyclic aromatic hydrocarbons in soil by mechanochemical method comprises the following steps:
[0030] 1) Put 20 parts of contaminated soil into a planetary ball mill, and add agate grinding balls according to the ball-to-material ratio of 10:1;
[0031] 2) Add 0.80 parts of percarbamide, 0.20 parts of reduced iron powder and 0.50 parts of ball milling aid quartz sand to the ball mill, and ball mill for 4.0 hours at a speed of 300 rpm;
[0032] 3) Discharge after ball milling, and use GCMS to analyze the residual concentration of polycyclic aromatic hydrocarbons in the soil. Among them, naphthalene in the soil is 104.1 mg / kg, fluoranthene is 98.8 mg / kg, and pyrene is 103.6 mg / kg.
Embodiment 2
[0034] The method for degrading polycyclic aromatic hydrocarbons in soil by mechanochemical method comprises the following steps:
[0035] 1) Put 20 parts of contaminated soil into a planetary ball mill, and add agate grinding balls according to the ball-to-material ratio of 20:1;
[0036] 2) Add 0.90 parts of percarbamide, 0.10 parts of reduced iron powder and 0.20 parts of ball milling aid quartz sand to the ball mill, and ball mill for 6.0 hours at a speed of 500 rpm;
[0037] 3) Discharge after ball milling, and use GCMS to analyze the residual concentration of polycyclic aromatic hydrocarbons in the soil, wherein, naphthalene in the soil is 80.4 mg / kg, fluoranthene 95.3 mg / kg, and pyrene 93.1 mg / kg.
Embodiment 3
[0039] The method for degrading polycyclic aromatic hydrocarbons in soil by mechanochemical method comprises the following steps:
[0040] 1) Put 20 parts of contaminated soil into a planetary ball mill, and add agate grinding balls according to the ball-to-material ratio of 15:1;
[0041] 2) Add 2.40 parts of percarbamide, 0.60 parts of reduced iron powder and 1.0 part of ball milling aid quartz sand to the ball mill, and ball mill for 2.0 hours at 600 rpm;
[0042] 3) Discharge after ball milling, and use GCMS to analyze the residual concentration of polycyclic aromatic hydrocarbons in the soil. Among them, naphthalene 69.1mg / kg, fluoranthene 72.8mg / kg, and pyrene 75.2mg / kg in the soil.
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Abstract
The invention provides a method for degrading polycyclic aromatic hydrocarbons in soil by a mechanochemical method, which is used to solve the problem of high cost of the existing chemical remediation technology. In the present invention, the soil polluted by polycyclic aromatic hydrocarbons is naturally air-dried, put into a ball mill with grinding balls, and the ball-to-material ratio is 10-20:1; at the same time, a double ball mill composed of solid oxidant and reduced iron powder is added into the grinding tank. The main agent and the ball milling aid are ground at the set speed and time, and the material can be discharged after the ball milling is completed to achieve the purpose of degrading organic pollutants; among them, the solid oxidant is percarbonamide, calcium percarbonate, ureaperoxide One or more combinations of calciumperoxide and calciumperoxide; the method not only has low degradation cost, but also has the characteristics of green environmental protection, convenience and high efficiency.
Description
technical field [0001] The invention belongs to the application field of soil restoration, and in particular relates to a method for degrading polycyclic aromatic hydrocarbons in soil by using a mechanochemical method. Background technique [0002] Polycyclic aromatic hydrocarbons (PAHs) are a class of hydrocarbons with carcinogenic, teratogenic and mutagenic properties. With the development of industry, a large amount of PAHs discharged is enriched in the soil under the action of dry deposition and wet deposition, and the pollution of the soil environment is becoming more and more serious. Therefore, it is urgent to find effective methods to control it. [0003] At present, commonly used PAHs-contaminated soil remediation technologies include physical remediation technology, biological remediation technology and chemical remediation technology. [0004] Among them, the physical remediation technology mostly removes or separates various organic pollutants in the soil by phy...
Claims
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Application Information
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