Method for rapidly treating heavy metal contaminated soil

Abstract

The invention provides a method for rapidly treating heavy metal contaminated soil, belongs to the technical field of soil pollution treatment, and particularly relates to a technology for treating the heavy metal contaminated soil by vegetation measures and biological measures. The method comprises the steps that humate fertilizer is applied to soil which is contaminated by heavy metal of Cd, As, Pb and Zn; then vetiveria zizanioides is planted on the soil, the planting distances between plant clusters range from 18 cm to 22 cm, the line spacing is 47-53 cm, and 6-10 plants are planted per cluster; NPK compound fertilizer is applied three months after the vetiveria zizanioides is planted and survived, and the dosage of the NPK compound fertilizer is 20-30 kg per mu; the stems and leaves of the vetiveria zizanioides are harvested in summer or winter each year; and the stems and leaves are used for fermenting methane or the handicraft industry when it is detected that the total amount of enriched heavy metal exceeds the standard and are used as pasture or fertilizer when it is detected that the total amount of the enriched heavy metal reaches the standard. The adopted vetiveria zizanioides has good heavy metal hyper-accumulation performance, and is resistant to barren, drought, acid and alkali, large in biomass, likely to survive and convenient to manage.

Description

technical field [0001] The invention belongs to the technical field of soil pollution control, and in particular relates to a technology for treating heavy metal pollution in soil by using plant measures and biological measures. Background technique [0002] Soil heavy metal pollutants are mainly mercury, lead, copper, zinc, chromium, nickel, tin and metal arsenic. At present, there are many heavy metal-contaminated soil treatment technologies, each of which has advantages and disadvantages. From various domestic and foreign literature reports on heavy metal pollution treatment, it can be found that most of the treatment methods use physical, chemical and biological methods. [0003] Due to the non-biodegradability and relative stability of heavy metals in soil, heavy metals are easy to accumulate in soil, and it is very difficult to restore them. It is very difficult to manage and restore them. In order to control and remediate polluted soil, traditional methods of remedia...

AI Technical Summary

Problems solved by technology

Physical methods have good effects and are not limited by soil conditions, but require a lot of manpower, material and financial resources, and require large investment, slow results, and damage soil structure and soil microorganisms; chemical methods are quick, but often expensive and require Complex equipment conditions, disrupted soil structure and easy to cause secondary pollution, etc., are helpless for large-scale pollution. Therefore, these methods cannot fundamentally solve the problem