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Method for restoring lead polluted soil by in-situ strengthening plant

A lead-contaminated soil and phytoremediation technology is applied in the field of in-situ enhanced phytoremediation of lead-contaminated soil, and can solve problems that have not yet been reported.

Inactive Publication Date: 2009-09-09
LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that both ammonium nitrogen fertilizer and chelating agent can improve the restoration efficiency of plants, but there is no report on the simultaneous use of both to strengthen the restoration ability of plants.

Method used

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  • Method for restoring lead polluted soil by in-situ strengthening plant
  • Method for restoring lead polluted soil by in-situ strengthening plant
  • Method for restoring lead polluted soil by in-situ strengthening plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Example 1: There is no pollution source around the potted experiment site, which is an area not polluted by heavy metals. The soil used in the experiment was collected from the topsoil (0-20cm) of the fallow land (a pollution-free area), and the soil type was meadow brown soil. A total of 4 concentrations were set in the experiment, which were the control CK (without adding Pb) and 3 different Pb concentration treatments. Pb concentration: 1000mg / kg (T1), 3000mg / kg (T2), 5000mg / kg(T3), which are 2, 6, and 10 times of the third-grade standard of my country's soil environmental quality standard (GBl5618, 1995), respectively, and the form of heavy metal added is Pb(NO 3 ) 2 , add it to the soil in solid form, mix well, and use it half a year after balancing.

[0014] The aster seeds are grown indoors, and the aster seeds are placed in a seedling box pre-loaded with sand. The ratio of sand to soil is 1:3. When the seedlings grow to 5-6 leaves, select the seedlings with th...

Embodiment 2

[0019] Example 2: There is no pollution source around the potted experiment site, which is an area not polluted by heavy metals. The soil used in the experiment was collected from the topsoil (0-20cm) of the fallow land (a pollution-free area), and the soil type was meadow brown soil. The lead content added in the soil is 1000mg / kg, which is twice the level 3 standard of my country's soil environmental quality standard (GBl5618, 1995), and the form of heavy metal added is Pb(NO 3 ) 2 , add it to the soil in solid form, mix well, and use it half a year after balancing.

[0020] The aster seeds are raised indoors, and the aster seeds are placed in a seedling box prepacked with sand, and the ratio of sand to soil is 1:3. When the seedlings grow to 5-6 leaves, the aster seedlings with the same growth are selected and transplanted. 2 weeks after transplanting, apply NH to the soil respectively 4 NO 3 , NH 4 Cl two kinds of acidic fertilizers, their addition amount is respectiv...

Embodiment 3

[0024] Example 3: There is no pollution source around the potted experiment site, which is an area not polluted by heavy metals. The soil used in the experiment was collected from the topsoil (0-20cm) of the fallow land (a pollution-free area), and the soil type was meadow brown soil. The lead content added in the soil is 1000mg / kg, which is twice the level 3 standard of my country's soil environmental quality standard (GBl5618, 1995), and the form of heavy metal added is Pb(NO 3 ) 2 , add it to the soil in solid form, mix well, and use it half a year after balancing.

[0025] The aster seeds are raised indoors, and the aster seeds are placed in a seedling box prepacked with sand, and the ratio of sand to soil is 1:3. When the seedlings grow to 5-6 leaves, the aster seedlings with the same growth are selected and transplanted. Planted in the above soil, and then applied the biodegradable chelating agent EDDS in two ways: one-time addition and five-time application. The spec...

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Abstract

The invention discloses a method for restoring lead polluted soil by in-situ strengthening plants, which comprises the following steps: China asters are replanted on soil with lead pollutants, and acid fertilizers NH4Cl and biodegradable chelating agents EDDS are applied to the soil. The invention uses the combined function of the acid fertilizer NH4Cl and the biodegradable chelating agent EDDS to strengthen and increase the total quantity of enriched lead of the overground parts of the China asters, and the China asters of the overground parts are harvested to treat the lead polluted soil. The method has high restoring efficiency and strong operability, furthest reduces environmental risks and human health hazards, and the like.

Description

1. Technical field [0001] The invention belongs to the technical field of pollution control, and in particular relates to a method for in-situ strengthening phytoremediation of lead-contaminated soil. 2. Background technology [0002] Soil-accumulated lead can be divided into two types: "natural sources" and "non-natural sources". Compared with natural sources, the emission of lead from non-natural sources has an absolute advantage. Especially after tetraethyl lead was added to gasoline as an antiknock agent in 1923, global lead pollution was accelerated. The situation of lead pollution in my country is very serious, and the lead content in the soil of some industrial towns is more than 100 times higher than the standard value. According to the investigation of heavy metal pollution in the soil of a smelter in Shenyang City, the concentration range of the total amount of Pb in the soil is 1004.3-9385.1mg / kg, far exceeding the national soil environment level 3 standard (500m...

Claims

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Application Information

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IPC IPC(8): B09C1/00
Inventor 崔爽赵杉林李萍商丽艳
Owner LIAONING UNIVERSITY OF PETROLEUM AND CHEMICAL TECHNOLOGY
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