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Method for concentrating soil heavy metals of sewage irrigation area by coalition of composite restoring agent and festuca arundinacea

A composite restoration and tall fescue technology, applied in soil conditioning materials, chemical instruments and methods, botanical equipment and methods, etc., can solve the number of soil microorganisms and micro-animals, as well as the impact of biodiversity, easily polluted deep soil and Groundwater, soil ecosystem impacts, etc.

Inactive Publication Date: 2014-06-18
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] Chelating agents used in the past cooperate with phytoremediation of heavy metal pollution, such as EDTA. The chelating agent itself and its complex with heavy metals have strong biological toxicity and solubility, and are difficult to be absorbed by light, biology or other chemical substances in the soil. Degradation, it is easy to pollute deep soil and groundwater, and EDTA will affect the number of soil microorganisms and microfauna and biodiversity, which may affect the soil ecosystem

Method used

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  • Method for concentrating soil heavy metals of sewage irrigation area by coalition of composite restoring agent and festuca arundinacea
  • Method for concentrating soil heavy metals of sewage irrigation area by coalition of composite restoring agent and festuca arundinacea
  • Method for concentrating soil heavy metals of sewage irrigation area by coalition of composite restoring agent and festuca arundinacea

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Experimental program
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Effect test

Embodiment 1

[0071] A method for compound restoration agent combined with tall fescue to enrich soil heavy metals in sewage irrigation areas, characterized in that it is carried out according to the following steps:

[0072] (1) Handling of materials:

[0073] The perennial tall fescue ( Festuca arundinacea L . ) is the experimental material;

[0074] The chelating agent is nitrilotriacetic acid (NTA), and the surfactant is sodium dodecylsulfonate;

[0075] After the grass roots and stones were removed, the collected soil was spread flat on a transparent plastic sheet, placed in a ventilated place, air-dried naturally for 2-3 days, and passed through a 2 mm sieve for later use; the basic physical and chemical properties of the soil: the soil organic matter content was 3.62%, the whole Nitrogen content 0.19%, total phosphorus content 5.4 g·kg -1 , total potassium 787.3 mg·kg -1 , pH7.28, soil water content 4.13%, electrical conductivity 0.44 ms cm -1 . The contents of Cd, Cu and Zn i...

Embodiment 2

[0080] (1) Handling of materials:

[0081] The perennial tall fescue ( Festuca arundinacea L . ) is the experimental material;

[0082] The chelating agent is nitrilotriacetic acid (NTA), and the surfactant is sodium dodecylsulfonate;

[0083] After the grass roots and stones were removed, the collected soil was spread flat on a transparent plastic sheet, placed in a ventilated place, air-dried naturally for 2-3 days, and passed through a 2 mm sieve for later use; the basic physical and chemical properties of the soil: the soil organic matter content was 3.62%, the whole Nitrogen content 0.19%, total phosphorus content 5.4 g·kg -1 , total potassium 787.3 mg·kg -1 , pH7.28, soil water content 4.13%, electrical conductivity 0.44 ms cm -1 . The contents of Cd, Cu and Zn in the soil were 7.13, 146.31 and 795.56 mg·kg, respectively -1 , are respectively 23.8, 1.5 and 3.2 times of the secondary standard of soil environmental quality (GB156182-1995);

[0084] (2) E...

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Abstract

The invention discloses a method for concentrating soil heavy metals of a sewage irrigation area by coalition of a composite restoring agent and festuca arundinacea, wherein the composite restoring agent consists of a chelating agent nitrilotriacetic acid (NTA) and a surfactant sodium dodecyl sulfate, wherein the mol ratio of the chelating agent nitrilotriacetic acid to the surfactant sodium dodecyl sulfate is (5-15) mmol.kg<-1>:1mmol.kg<-1>. Experimental results show that a most remarkable effect of increasing the content of Cd in the festuca arundinacea is achieved due to the addition of the surfactant and the chelating agent, the concentration of the heavy metals can be promoted through co-addition of the surfactant and the chelating agent, and especially the effect is more remarkable when 5 mmol.kg<-1> of the NTA and 1 mmol.kg<-1> of the chelating agent or 10 mmol.kg<-1> of the NTA and 1 mmol.kg<-1> of the chelating agent are used for restoring sewage irrigation soil.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and relates to a method for enriching soil heavy metals in sewage irrigation areas by combining a composite restoration agent with tall fescue. Background technique [0002] my country's total water resources rank among the top in the world, but the per capita share is very small. It is one of the 13 water-poor countries. In addition, my country's water resources are still facing various pollution problems. The lack of water resources has become an important factor restricting my country's economic development. one. Reasonable use of sewage irrigation can not only alleviate the problem of water shortage, but also save water resources and reduce environmental pollution. Sewage irrigation refers to the harmless treatment of urban domestic sewage and industrial wastewater, which is directly or indirectly used for farmland sewage irrigation, garden sewage irrigation and underground r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K17/14A01G1/00
Inventor 赵树兰多立安常晨
Owner TIANJIN NORMAL UNIVERSITY
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