Method for treating arsenic and lead-polluted soil by using ciliate desert-grass and violet and recycling arsenic and lead

Abstract

The invention discloses a method for treating arsenic and lead-polluted soil by using ciliate desert-grass and violet and recycling arsenic and lead. The method comprises the following steps: (1) selecting target plants; (2) collecting the target plants; (3) planting the target plants; (4) treating the soil; and (5) recycling the arsenic and the lead which are enriched in the plants. The target plants comprise the ciliate desert-grass and the violet; the target plants are directly collected from a target plant enrichment region; the violet and the ciliate desert-grass are respectively planted into the polluted soil according to a distance of 0.1 to 0.2 m in April and August, and the two plants are planted in a plum blossom type hybrid manner; the treatment of the soil specifically comprises enriching arsenic and lead ions in wet soil into the plants under the super enrichment action of the ciliate desert-grass to the arsenic and the super enrichment action of the violet to the lead ions; and the recycling of the arsenic and the lead which are enriched in the plants specifically comprises harvesting aboveground parts of the plants in November and December of each year, then chopping the plants enriched with the arsenic and the lead, drying the chopped plants in air, and extracting recyclable arsenic and lead elements by a chemical mode.

Description

technical field [0001] The invention relates to the field of arsenic and lead prevention and control, in particular to a method for treating arsenic and lead polluted soil by using centipede grass and viola and recycling arsenic and lead. Background technique [0002] Heavy metal pollution refers to environmental pollution caused by heavy metals or their compounds. It is mainly caused by human factors such as mining, exhaust gas discharge, sewage irrigation and the use of products with heavy metals exceeding the standard. Due to human activities, the content of heavy metals in the environment increases, which exceeds the normal range, directly endangers human health, and leads to the deterioration of environmental quality. At the beginning of April 2011, my country's first "12th Five-Year" special plan - "Heavy Metal Pollution Comprehensive Prevention and Control "12th Five-Year Plan" was officially approved by the State Council, and the prevention and control plan strives ...

AI Technical Summary

Problems solved by technology

[0003] Soil remediation appears more difficult than air and water pollution

Su Dechun, a member of the Ministry of Agriculture's expert group on the prevention and control of heavy metal pollution in agricultural product areas and a professor at the School of Resources and Environment of China Agricultural University, said that not only is soil pollution a serious hazard, but it is also different from some organic pollutants in that heavy metals in soil cannot be degraded, and it is very difficult to separate them from the soil. , it is very difficult to repair

[0004] Among the relevant patents that have been applied in China, the patent "A Microbial Remediation Method for Heavy Metal Contaminated Soil" (Application No.: 201110122739.6, Publication Date: 2011-11-16) discloses a method of soil treatment using Rhodobacter sphaericus preparations combined with flooding The method, whose working principle is mainly to use Rhodobacter sphaericus to absorb heavy metals after multiplying in a large amount in a water-rich anaerobic environment, and then infiltrate into the ground through water to reduce the concentration of heavy metals in the soil. Due to the lack of pertinence, it cannot target specific soils (such as arsenic , lead-contaminated soil) for treatment, and the heavy metals after adsorption seep into the ground with water, causing secondary pollution of groundwater; 04-22) discloses a heavy metal-contaminated soil remediation agent using Bacillus subtilis and Candida tropicalis as active ingredients. Candida tropicalis is an anaerobic fungus, which cannot survive for a long time in dry and ventilated soil, while Bacillus subtilis, as an aerobic bacteria, cannot survive for a long time in wet soil. The effect is neither long-lasting nor recycling of polluting resources