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Plant repairing method for soil polluted by heavy metal cadmium

A technology for cadmium-contaminated soil and phytoremediation, which is applied in the field of phytoremediation and chemical enhancement of heavy metal cadmium-contaminated soil, can solve the problems of unrealistic soil remediation and high production cost of EDDS reagents, and achieves improved remediation efficiency, low remediation cost, A wide range of effects

Inactive Publication Date: 2009-07-22
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The related patent (leaching agent and method for repairing heavy metal copper-contaminated soil, publication number CN200810019400) has proposed the method of using ethylenediamine disuccinic acid (EDDS) and ethyl lactate to repair soil heavy metal copper pollution, but only limited to soil Rinse remediation, not involving chelation-induced phytoextractive remediation
Moreover, the production cost of EDDS reagents is relatively high at present, so it is not realistic to use EDDS in large quantities for soil remediation.

Method used

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  • Plant repairing method for soil polluted by heavy metal cadmium
  • Plant repairing method for soil polluted by heavy metal cadmium
  • Plant repairing method for soil polluted by heavy metal cadmium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Suliu clone J10ll (Salix×jiangsuensis CL.1011, referred to as Suliu J1011) was selected, and one-year-old seedlings were cut from the base of the seedlings in the nursery, brought back to the laboratory, and inserted into the culture medium for later use. The test cuttings were 15cm long and about 2cm in diameter. With 1 / 2 Hoagland nutrient solution as nutrition, with Cd(NO 3 ) 2 The solution is the mother solution, and the Cd concentration is set as follows: 0, 6, 9, 20 and 23 mg / L, a total of 5 treatments, and the test was carried out for 15 days, respectively, on days 1, 2, 3, 4, 5, 9, 13, and 15. Water samples were collected for determination, and plant samples were collected 15 days later to determine the Cd content in leaves and stems. Different concentrations of Cd in Suliu J1011 culture 2+ Cd in aqueous solution 2+ Concentration changes with time and different concentrations of Cd 2+ The content of Cd in the stems and leaves of Suliu J1011 after solution ex...

Embodiment 2

[0027] Effects of different ratios of EDTA and ethyl lactate on the enrichment of Cd in Suliu clone J10ll

[0028] Suliu clone J10ll (Salix×jiangsuensis CL.1011, referred to as Suliu J1011) was selected, and one-year-old seedlings were cut from the base of the seedlings in the nursery, brought back to the laboratory, and inserted into the culture medium for later use. The test cuttings were 15cm long and about 2cm in diameter. With 1 / 2 Hoagland nutrient solution as nutrition, with Cd(NO 3 ) 2The solution is the mother liquor, the mass concentration of Cd is set to 5mg / L, the molar ratio of the total amount of EDTA and ethyl lactate to Cd is 2:1, and the ratio of EDTA to ethyl lactate is set to 22:0, 22:5, 17 :5, 14:5, 14:8 and 11:11 (the total amount is counted as 22), respectively recorded as T4L1, T4L2, T3L2, T2L2, T2L3 and T1L4. For each of the above treatments, 3 replicates were set, and 4 cuttings were set for each replicate. A 1500mL plastic container was used for th...

Embodiment 3

[0031] In situ phytoremediation of heavy metal cadmium contaminated soil and its new chemical enhanced remediation effect

[0032] 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, and backfill in layers when backfilling the surface soil, sprinkle the aqueous solution of Cd evenly in layers, and mix well Level the land, and break down the large soil particles on the surface. Then use PVC partitions to divide into several 1×1m 2 The square community, the clapboard is buried at a depth of 25cm. Every 3 adjacent cells is a group of parallel. The plant to be planted is Suliu J1011, and the planting time is 3 days after the pollution treatment. The treatment groups include: soil control group, plant control group, EDTA treatment plant group (the molar ratio of EDTA and Cd addit...

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Abstract

The invention discloses a method for recovering plants in soil subjected to heavy metal cadmium pollution, and belongs to the field of soil pollution control in environmental protection. The method comprises the following steps: (A) periodically measuring the content of cadmium in the soil, and grafting willow; and (B) after the willow is grafted for two months, adding chemical enhancer consisting of ethyl lactate and ethylene diamine tetraacetic aid into the soil. In the step A, the willow is selected from Jiangsu willow clone J1011, and the planting density of the willow is between 4 and 6 strains every square meter when the content of the cadmium in the soil is 6 milligrams in every kilogram of soil. The method can overcome the defects of short and small strains, low growth rate, small amount of ground biology, and the like during recovery of the plants polluted by the heavy metal cadmium, improve recovery efficiency by singly using organic ligand as a chelate extracting agent to recover the heavy metals, has lower recovery cost, and reduces the use level of synthetic chelating agent such as EDTA by using the ethyl lactate so as to reduce environmental risk for recovering the heavy metal cadmium in the soil by extracting the plants.

Description

technical field [0001] The invention relates to the field of soil pollution control in environmental protection, in particular to a phytoremediation and chemical strengthening method for soil polluted by heavy metal cadmium. Background technique [0002] Soil is an important natural resource for human survival and development and the basis for the existence of the entire terrestrial ecosystem. It is very important for the sustainable development of agriculture and human survival. With the advancement of modernization, the problem of soil pollution in my country is becoming more and more serious. The annual reduction in grain production due to heavy metal contamination of soil reaches tens of millions of tons, which poses a severe challenge to the sustainable use of cultivated land resources and the safety of food production. The remediation of soil heavy metal pollution has become one of the hot topics in the field of environmental science at home and abroad. Cd is a common...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00B09C1/10
Inventor 郭红岩李佳华孙媛媛季荣王晓蓉
Owner NANJING UNIV
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