Method for removing soil arsenic pollution by interplanting pteris vittata

Abstract

The invention relates to a method for removing soil arsenic pollution by interplanting pteris vittata. The method comprises the following treatment steps: firstly, lime is spread on soil according to an applying standard of 100-200 kg / Mu to adjust the pH value; after spreading of the lime, a waterproof film with a thickness of 0.1 cm covers the soil; a layer of cardboard with a thickness of 0.1 cm covers the waterproof film; and 20-40 cm pollution-free alien soil covers the cardboard; pteris vittata is interplanted in polluted soil; crops are planted in the pollution-free alien soil, and 20-100 cm gaps are kept from pteris vittata to the crops; and finally, after pteris vittata is planted by one year, pteris vittata can be totally pulled away, and the polluted soil reaches the national farmland secondary standard. The cost of eliminating the soil arsenic pollution is lower; the created value is the value sum of the crops and pteris vittata; and the method has such characteristics as good use effect, economy, environmental protection and low pollution treatment cost.

Description

technical field [0001] The invention belongs to the technical field of pollution control and relates to a method for interplanting centipede grass to eliminate arsenic pollution in soil. Background technique [0002] Arsenic pollution refers to environmental pollution caused by arsenic or its compounds. The mining and smelting of arsenic and arsenic-containing metals, the production of glass, pigments, technical materials, and paper using arsenic or arsenic compounds as raw materials, and the burning of coal can all produce arsenic-containing waste water, waste gas and waste residue, which will pollute the environment . In addition to natural causes such as rock weathering and volcanic eruptions, atmospheric arsenic pollution mainly comes from industrial production, the use of arsenic-containing pesticides, and coal combustion. Wastewater containing arsenic, pesticides and smoke will pollute the soil. Arsenic accumulates in the soil and thus enters the crop tissues, makin...

AI Technical Summary

Problems solved by technology

Among them, plant extraction refers to a method that uses plant roots to absorb soil pollutants and transport them to the aboveground parts of plants, and remove pollutants in the soil by harvesting the aboveground substances. Usually, the effect of phytoremediation is also low, and there will be Competing with crops for water and fertilizer is not conducive to the growth of crops, and the treatment effect on arsenic pollution in the soil is not obvious; the arsenic content in centipede grass can reach 1-2%, and most of them are concentrated in the above-ground parts, which can be improved Loamy soil, can be harvested up to three times a year