Plant restoration method for lead pollution of soil

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...

AI Technical Summary

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 small biomass.

[0013] However, most of the above-mentioned lead hyperaccumulative plants have small biomass and slow growth, which greatly limits their practical application in remediating lead-contaminated soils.