Plant restoration method for lead pollution of soil

A lead-contaminated soil and phytoremediation technology, which is applied in the restoration of polluted soil and other directions, can solve the problems of limiting the practical application of lead-contaminated soil remediation, small lead hyperaccumulation plant biomass, and small microbial biomass, etc., so as to prevent and control soil erosion. , the social and economic benefits are obvious, the effect of large bioconcentration coefficient

Inactive Publication Date: 2007-02-28
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this method has many limitations: on the one hand, the biomass of microorganisms is too small to absorb less lead; on the other hand, it is difficult to carry out subsequent treatment because of its...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The pH value of a lead-contaminated soil is 6.5-7, and the average lead content in it is 500mg / kg. Transplant Budisma japonica into the soil according to the distance between plants of 2-4m. After 5 months of surviving growth, harvest its aerial part for the first time. After analysis, the lead content in the aboveground part is 1410 mg / kg, and the average lead content in the soil is reduced from 500 mg / kg to 432 mg / kg, which is equivalent to reducing the lead content in the soil by 13.60%. Harvest every 100-120cm in the future, leave 30-40cm of stubble after each harvest, and the lead content in the soil will continue to decrease. After 5 harvests, the lead content in the soil will drop to the normal level (<100mg / kg), effectively The purpose of eliminating lead pollution in soil has been achieved. Harvests are sent to landfills for safe burial.

Embodiment 2

[0029] The pH value of a lead-contaminated soil is 8.4. Its pH was adjusted to 7.0-6.2 by adding oxalic acid. According to the distance between plants of 2-4m, after 6 months of planting Budhimonia japonica, harvest the aboveground part. According to the analysis and determination, the total amount of lead migration of 100 plants of Budisma Mimosa is 1390mg. It can be seen that by planting Dendrobium japonica, a large amount of lead in the soil can be quickly transferred to the aboveground part of Buddleia japonica. After the aboveground part is harvested, the lead in the soil can be effectively taken away, and the effect of controlling soil lead pollution can be obtained. Harvests are sent to landfills for safe burial.

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PUM

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Abstract

The invention discloses a plant restoring method of lead polluted soil, which comprises the following steps: planting butterflybush flower in the soil polluted by lead through direct transplanting or sowing pattern, controlling the soil acidity at neutral or acidness, harvesting periodically or according to lead content or growing height, remaining certain segment of sprout, disposing the harvested material at special place.

Description

1. Technical field [0001] The invention relates to a phytoremediation method for controlling lead-contaminated soil, belonging to the technical field of pollution control. 2. Background technology [0002] The phenomenon of lead-contaminated soil is relatively common in some places in my country, especially in some non-ferrous metal mining areas and surrounding areas of smelters. The average lead content in the soil is 500-18096mg / kg, far exceeding GB15618-1995 "Soil Environmental Quality Standards" Medium is the soil critical value (≤500mg / kg) to ensure agricultural and forestry production and normal plant growth. In the soil that has not been polluted by lead, the lead content is generally only 2-100 mg / kg, with an average of 10 mg / kg. [0003] Lead is a cumulative poison. Lead in the soil can be absorbed by organisms and transferred to organisms, and humans ingest lead through the food chain. Studies have found that long-term exposure to excessive lead and its compounds...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/10
Inventor 宁平曾向东贺彬刘晓海王志芸王宏镔王海娟赵睿范麦妮戴文娇
Owner KUNMING UNIV OF SCI & TECH
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