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Method for adopting eluting solution to restore sewage irrigation area soil heavy metal

A technology of eluent and heavy metals, applied in soil conditioning materials, chemical instruments and methods, botanical equipment and methods, etc., can solve problems such as environmental hazards, pollution, and failure to apply to fields

Inactive Publication Date: 2014-07-16
TIANJIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0018] At present, most reports and studies have shown that the soils irrigated by sewage in my country have different degrees of heavy metal pollution, which is obviously harmful to the environment and human beings, and the current research results of the laboratory cannot be applied to the field for the time being. It is necessary to restore the method or technology of heavy metals in sewage irrigation soil

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The method for remediating soil heavy metals in sewage irrigation areas with composite eluent is characterized in that it proceeds in the following steps:

[0063] (1) Handling of materials:

[0064] The perennial tall fescue ( Festuca arundinacea L . ) is the experimental material;

[0065] The chelating agent is selected nitrilotriacetic acid, and the surfactant is selected sodium dodecylsulfonate;

[0066] The soil for the test was taken from the sewage irrigation area of ​​Xiqing District, Tianjin. After removing grass roots and stones, the collected soil was spread flat on a transparent plastic sheet, placed in a ventilated place, and dried naturally for 2 to 3 days, then passed through a 2 mm sieve for later use. The soil organic matter content is 3.62%, the total nitrogen content is 0.19%, and the total phosphorus content is 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...

Embodiment 2

[0071] The method for remediating soil heavy metals in sewage irrigation areas with composite eluent is characterized in that it proceeds in 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 selected nitrilotriacetic acid, and the surfactant is selected sodium dodecylsulfonate;

[0075] The soil for the test was taken from the sewage irrigation area of ​​Xiqing District, Tianjin. After removing grass roots and stones, the collected soil was spread flat on a transparent plastic sheet, placed in a ventilated place, and dried naturally for 2 to 3 days, then passed through a 2 mm sieve for later use. The soil organic matter content is 3.62%, the total nitrogen content is 0.19%, and the total phosphorus content is 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...

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Abstract

The invention discloses a method for adopting an eluting solution to restore sewage irrigation area soil heavy metal. The eluting solution is composed of nitrilotriacetic acid which is a chelating agent and sodium dodecyl sulfate which is a surfactant, and mole ratio of nitrilotriacetic acid and sodium dodecyl sulfate is 5-15mmol kg-1:1mmol kg-1. On the basis of an optimal experiment, restored soil is eluted by using simulated acid rain, the objective of eluting restoration of lawn planting system sewage irrigation area soil heavy metal pollution is achieved, and the sewage irrigation area soil heavy metal after reaching the standard can continue to be applied to agricultural production.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a method for repairing heavy metals in soil in sewage irrigation areas by using composite eluent. Background technique [0002] my country's water resources are still facing various pollution problems, and the lack of water resources has become one of the important factors restricting my country's economic development. 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 reservoir recharge. After the founding of the People's Republic of China, my country began to build sewage irrigation projects in 1957, and it has lasted for more than half a century. Dur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A01G1/00C09K17/14C09K101/00
Inventor 多立安赵树兰常晨
Owner TIANJIN NORMAL UNIVERSITY
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