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Method for remediating lead-contaminated soil or water

A lead-contaminated soil and water body technology, applied in the field of lead pollution control, can solve the problems of poor environmental adaptability and small biomass of hyperaccumulator plants, and achieve the effects of low cost, rapid growth and simplified repair process

Active Publication Date: 2010-10-06
GUANGDONG SILV ENVIRONMENTAL PROTECTION ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to provide a kind of remediation lead pollution that has strong environmental adaptability and does not destroy the environmental soil structure according to the problems of low biomass and poor environmental adaptability of hyperaccumulator plants existing in the existing phytoremediation of lead pollution control. soil or water method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This experiment was carried out in Shaoguan City, Guangdong Province, and the soil lead content was 2718mg kg -1 . On the lead-contaminated soil, Polygonum officinalis was planted, and at the same time, a Brassicaceae plant was planted as a control plant (plants of this family and genus are considered to have a strong ability to accumulate heavy metals), and the planting time was 2008. The test results show that in the soil of the test area, the average lead content in the harvested parts of Polygonum chinensis is 956mg kg -1 , which is close to the critical content standard of lead hyperaccumulator plants (1000mg kg -1 ). However, the average lead content in the shoots of Brassica plants in the Brassicaceae family is only 60 mg kg -1 , which is one-sixteenth of the lead enrichment in Polygonum chinensis. It can be seen that Polygonum officinale has a strong ability to enrich lead.

Embodiment 2

[0025] This experiment was carried out in Guangzhou City, Guangdong Province, and it was a pot experiment. The control soil lead content was 46mg kg -1 , lower than the maximum limit of Pb content (Pb≤50mg.kg -1 ). Three lead treatment concentrations were set in the test soil, and the Pb content of the soil treated with low lead was 488mg kg -1 , which is lower than the maximum limit of Pb content in third-grade soil (Pb≤500mg.kg-1) in the soil environmental quality standard (GB 15618-1995). The soil Pb content of medium lead treatment is 998mg.kg -1 , which is 2 times of the level 3 soil standard. The Pb content of high lead treatment is 3103mg kg -1 , close to industrial pollution areas or Pb-contaminated soil in mining areas. Planting time is 2009. Cut about 5cm of Polygonum officinalis branches, insert the cuttings into flowerpots with a diameter of 25cm and a height of 12cm, 5 plants per pot. Two weeks later, the seedlings were settled, and 3 plants were kept in e...

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Abstract

The invention discloses a method for remediating lead-contaminated soil or water, which comprises the following steps: (1) collecting Polygonum criopolitanum; (2) planting Polygonum criopolitanum in soil or water; (3) periodically harvesting the Polygonum criopolitanum and part of stolons above the ground or water; (4), continuing to plant and harvest the Polygonum criopolitanum till the lead content of the soil or water reaches a safe standard; and (5) performing pollution-free disposal on the harvested Polygonum criopolitanum. In the method of the invention, the Polygonum criopolitanum is planted in the lead-contaminated soil or water, so extraction can be performed continuously, the remediation process of the soil and water is simplified, and the lead contamination problem of soil can be solved radically. The method of the invention is low in cost and high in maneuverability and avoids damaging the structure of the environmental soil and causing secondary pollution.

Description

technical field [0001] The invention relates to the technical field of lead pollution control, in particular to a method for repairing lead-contaminated soil or water body. Background technique [0002] With the rapid development of the economy and the increase of human industrial and agricultural production activities, the problem of soil heavy metal pollution has become increasingly serious. It is estimated that the currently polluted cultivated land area in China is nearly 20 million hectares, accounting for about 1 / 5 of the total cultivated land area (Wei Chaoyang, Chen Tongbin. Research progress in heavy metal hyperaccumulator plants and phytoremediation technology. Acta Ecologica Sinica 2001, 21(7) ): 1196-1203.). Due to the prevalence and severity of soil lead pollution, some scholars have listed lead as the most important and typical heavy metal pollutant in my country's soil pollution. Sewage irrigation, sludge application, atmospheric deposition of heavy metal-co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00C02F3/32
CPCY02W10/10
Inventor 杨中艺周轶慧袁剑刚陈梦如陆剑曾小龙高桂娟
Owner GUANGDONG SILV ENVIRONMENTAL PROTECTION ENG CO LTD
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