Method for remediating polluted soil by using crayfish farming

Abstract

The invention discloses a method for repairing polluted soil in the manner of langoustine breeding. The method comprises the following steps: 1) firstly, turning and tilling the polluted soil, using an aqueous hydrogen peroxide solution for spraying the polluted soil, digging a plurality of breeding tanks and adjoining the breeding tanks by taking the polluted soil as the tank walls, wherein first and second openings are formed in the breeding tanks and the first and second openings are formed in the tank walls on the opposite sides; 2) filling the breeding water into the breeding tanks and adopting flowing water circulation; 3) transplanting algae into the breeding tanks; 4) putting young langoustines into the breeding tanks and putting fodders into the breeding tanks twice per day; 5) breeding for 2-4 months till the young langoustines grow up and then fishing out; 6) repeating the steps 2-5 and then breeding the langoustine; 7) draining the breeding water in the breeding tanks and then overturning and leveling the breeding tanks again and repeating the steps 1-6 till the heavy metal content in the area of the polluted soil reduces to the content meeting the corresponding national standard.

Description

technical field [0001] The invention belongs to the technical field of soil remediation, and relates to a method for remediating polluted soil by means of crayfish breeding. Background technique [0002] Heavy metal pollution of the soil refers to human activities, the content of trace metal elements in the soil exceeds the background value, and the excessive content caused by excessive deposition is collectively referred to as soil heavy metal pollution. Sources of pollution include pesticides, waste water, sludge, and atmospheric deposition. Many rice crops in China were found to have exceeded cadmium standards, and soil pollution has become a "public nuisance." The emergence of the "cadmium rice crisis" once again sounded the alarm for soil pollution. Soil pollution remediation includes in-situ treatment and ex-situ treatment. In-situ treatment is widely used because it is easier to implement. However, in in-situ treatment, the traditional chemical leaching method can ...

AI Technical Summary

Problems solved by technology

However, in in-situ treatment, the traditional chemical leaching method can easily damage the structure of the soil itself, making it difficult to recycle the soil, and some leaching agents are difficult to biodegrade, which will cause secondary pollution to the soil, and the price of some leaching agents Expensive makes it difficult to popularize and apply the leaching method in engineering

At the same time, the washed eluent still exists in the soil, which poses certain safety hazards.