Method for repairing arsenium-polluted farmland soil through microorganisms and plants in combined manner

Abstract

The invention discloses a method for repairing arsenium-polluted farmland soil through microorganisms and plants in a combined manner. The method includes the following steps that firstly, a microbial agent is sprayed, wherein nodule bacteria are sprayed in the arsenium-polluted farmland soil after being dissolved in water; secondly, plant plantation is conducted, wherein Nephrolepiscordifolia(L.)Presl is planted in the arsenium-polluted farmland soil where the nodule bacteria are sprayed; and thirdly, field management is conducted, wherein the field management is conducted on the Nephrolepiscordifolia(L.)Presl, and normal growth of the plants is ensured. Treatment of arsenium-polluted farmland soil repair is conducted through the microorganisms and the plant repair technology in a combined manner, the nodule bacterium NT-26 and Nephrolepiscordifolia(L.)Presl combined repair is adopted, the leaching concentration of the heavy metal arsenium in the repaired and treated farmland soil is smaller than the IV-type standard in Quality Standard for Ground Water (GB / T14848-93), the whole construction process is high in benefit, and influences on the environment are small.

Description

technical field [0001] The invention belongs to the field of soil pollution control in environmental protection, and in particular relates to a method for repairing arsenic-contaminated farmland soil by using microorganisms combined with plants. Background technique [0002] Arsenic (AS) is a non-essential element for the human body. The toxicity of elemental arsenic is extremely low, while arsenic compounds are highly toxic, and trivalent arsenic compounds are more toxic than other arsenic compounds. Arsenic pollution mainly comes from industrial wastewater from mining, metallurgy, chemical industry, chemical pharmaceuticals, pesticide production, textile, glass, leather and other departments. The background value of arsenic in soil is about 10mg / kg. After long-term irrigation of farmland with arsenic-containing wastewater, the arsenic content will increase over time and cause soil arsenic pollution. A large amount of data shows that the soil polluted by arsenic may signi...

AI Technical Summary

Problems solved by technology

[0008] method Agricultural Engineering Technology Chemical and Physicochemical Restoration Techniques bioremediation technology technical reliability reliable reliable reliable, risky technical security There is a certain risk There is a certain risk little risk Repair area medium Small Big application conditions It is suitable for moderately and heavily polluted soil, but not suitable for heavy pollution Suitable for moderately and heavily polluted soil It is suitable for soil with light pollution intensity, which requires strong plantability of the soil Implementation conditions in situ in situ or ex situ in situ Disposal No post-processing required No post-processing required Plants need to be harvested regularly and need to be dried and incinerated resource utilization no resource utilization no resource utilization The dry incineration of plants rich in heavy metals can generate heat, and the incineration ash can be used as smelting materials surface water pollution smaller none none groundwater pollution there is a certain risk none none soil properties change there is a certain risk More destructive Basically no damage Investment and operating costs Highest higher lower

[0009] According to the comparison in the above table, it can be seen that each method has advantages and disadvantages, but the heterotopic restoration of the farmland will cause the fertility of the farmland plow layer to decrease, change the physical and chemical properties of the farmland soil, and the addition of chemical restoration agents such as curing / stabilization will easily cause secondary pollution. , pollute the farmland environment, and also have the problem of changing the physical and chemical properties of the soil