Chemical enhanced phytoremediation method of polycyclic aromatic hydrocarbon-cadmium pollution soil

A technology for cadmium-contaminated soil and polycyclic aromatic hydrocarbons, which is applied in the field of soil pollution control, can solve the problems of complicated steps and poor restoration effect, and achieves the effects of enhancing restoration effect, realizing restoration and improving restoration efficiency.

Inactive Publication Date: 2010-02-10
NANJING UNIV
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Problems solved by technology

[0008] Aiming at the problems of complex steps and poor restoration effect in the existing methods for remediating soil polycyclic aromatic hydrocarbons-cadmium pollution, the present invention provides a chemically enhanced phytoremediation method for soil polycyclic aromatic hydrocarbons-cadmium pollution, through which low-cost , Efficient, and safer soil remediation, which can be actually applied to the remediation of organic and heavy metal compound polluted soil

Method used

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  • Chemical enhanced phytoremediation method of polycyclic aromatic hydrocarbon-cadmium pollution soil
  • Chemical enhanced phytoremediation method of polycyclic aromatic hydrocarbon-cadmium pollution soil
  • Chemical enhanced phytoremediation method of polycyclic aromatic hydrocarbon-cadmium pollution soil

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Remediation effect of chemically enhanced phytoremediation on cadmium pollution in soil under complex pollution conditions

[0027] The restoration test site is located in a town in Jiangning District, Nanjing. During the test, first dig out 200m 2 For the soil in the rectangular plot, build the test pond and prepare the infiltration water collection system, then backfill the soil, backfill in layers when backfilling the topsoil, and evenly sprinkle the aqueous solution of Cd and polycyclic aromatic hydrocarbon phenanthrene in layers And the solution of pyrene, after fully mixing, level the land, and finely grind the large soil particles on the surface. Then use PVC partitions to divide into several 1×1m 2 The square community, the partition depth is 25cm. Every 3 adjacent cells is a group of parallel. The plant to be planted is Weeping Willow J1011, and the planting time is 3 days after the pollution treatment. The treatment groups are: soil control group, Weeping...

Embodiment 2

[0032] Remediation effect of chemically enhanced phytoremediation on phenanthrene pollution in soil under complex pollution conditions

[0033] Its basic steps are the same as in Example 1, and the treatment groups include: soil control group, willow willow control group, willow willow+EDTA group, willow willow+EDTA+ethyl lactate group, which are respectively denoted as CK, W, W+ET and W+ET+EW. Figure 4 The change of the concentration of phenanthrene and pyrene in the soil after the beginning of various treatments is given. From Figure 4 It can be seen that after the treatment began, the planting of weeping willow (4 plants / m 2 ) can promote the decrease of phenanthrene concentration in soil, but under W treatment, the decrease of phenanthrene concentration in soil is not significantly different from that under CK treatment. Weeping willow has been planted for 4 months before the treatment. At this time, the concentration of phenanthrene in the leaves and stems of weeping...

Embodiment 3

[0037] Remediation effect of chemically enhanced phytoremediation on pyrene pollution in soil under complex pollution conditions

[0038] Its basic steps are the same as in Example 1, and the treatment groups include: soil control group, willow willow control group, willow willow+EDTA group, willow willow+EDTA+ethyl lactate group, which are respectively denoted as CK, W, W+ET and W+ET+EW. Figure 7 The change of pyrene concentration in the soil after the beginning of various treatments is given. Under W treatment, the decrease of pyrene concentration in soil was not significantly different from that under CK treatment. Depend on Figure 7 It can be seen that the addition of EDTA (N+ET group) has a slight promotion effect on the reduction of pyrene concentration in the soil, but the effect has no statistically significant difference (p>0.05). Ethyl lactate (280ml / m 2 ) had a certain promoting effect on the reduction of pyrene concentration in soil ( Figure 7 ).

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Abstract

The invention relates to a chemical enhanced phytoremediation method of polycyclic aromatic hydrocarbon-cadmium pollution soil, belonging to the field of soil pollution regulation; the method comprises the following steps: (A) the content of cadmium, polycyclic aromatic hydrocarbon, phenanthrene and pyrene in the soil is measured, and willow sowing is carried out; (B) chemical enhancer constitutedby ethyl lactate and ethylene diamine tetraacetic acid is added after the willow is sewed for four months. The willow is golden silk willow J1022, and the planting density of the willow is respectively 4-6 per square meter in the soil which has 5mg phenanthrene, 50mg pyrene and 6mg cadmium in one kilogram. The method avoids the disadvantages of short and small plant, slow growing speed, and low living weight at the upper part of the soil in the phytoremediation, reduces the environment risk of heavy metal cadmium in the plant extraction soil remediation; the adding of the chemical enhancer improves the remediation efficiency that an organic ligand is singly used as chelating solvent extraction agent to remediate the heavy metal, and the remediation effect of polycyclic aromatic hydrocarbon of organic pollutants in the soil is enhanced at the same time, and the remediation of cadmium and polycyclic aromatic hydrocarbon combined pollution in the soil is realized at the same time.

Description

technical field [0001] The invention relates to the field of soil pollution control in environmental protection, in particular to a chemically strengthened phytoremediation method for soil polycyclic aromatic hydrocarbon-cadmium pollution. Background technique [0002] Due to industrial "three wastes" discharge, unreasonable sewage irrigation, sludge use, garbage and excessive use of chemical substances such as fertilizers, pesticides, and agricultural films, various inorganic and organic pollutants have accumulated in the soil. According to reports, about 20 million hectares of heavy metal-polluted land in my country 2 , 13-16 million hm of land contaminated by pesticides 2 , of which the cultivated land area with serious pollution is nearly 20 million hm 2 , accounting for about 1 / 5 of the total cultivated land area. Heavy metals and organic matter in polluted soil can not only cause water pollution through migration into surface water and groundwater, seriously affecti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/08B09C1/10
Inventor 孙媛媛郭红岩李佳华王晓蓉季荣尹颖
Owner NANJING UNIV
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