Method for restoring heavy metal pollution soil

Abstract

The invention provides a method for restoring heavy metal pollution soil. The method comprises the following steps of: firstly, breeding algae on soil, subsequently absorbing a large quantity of heavy metal ions by the algae in the growing process by the characteristic of absorbing the heavy metal ions; and cultivating angleworms when the algae grow lushly, wherein the angleworms like to eat organic substances in the soil, the algae are the first choice of food for the angleworms, and the algae with the heavy metal ions are swallowed by the angleworms, so that the heavy metal ions are absorbed through digestive systems of the angleworms along with the algae organic substances, and therefore, heavy metal can be enriched in the angleworm bodies; and finally, removing the heavy metal out form a soil system through a manner of taking out the angleworms.

Description

technical field [0001] The invention relates to a method for repairing heavy metal polluted soil. Background technique [0002] Soil is the fertile and loose surface of the earth that can grow plants. It is a necessary means of production for human survival and development, and it is also the most basic, important, and irreplaceable natural resource for human society. Therefore, the protection of soil environment has attracted attention. extensive attention. Among soil pollutants, heavy metal pollution is a typical class of priority pollutants. Many environmental hazards, such as the bone pain disease in Japan (1931-1972), were caused by heavy metal pollution, which is very important for the restoration of heavy metal-contaminated soil. At present, tens of thousands of tons of mercury, millions of tons of copper, lead, and tens of millions of tons of manganese are discharged into the soil in various ways on average every year in the world. The cultivated land area polluted...

AI Technical Summary

Problems solved by technology

[0003] The existing heavy metal contaminated soil remediation technologies mainly include chemical methods (chemical immobilization and stabilization, chemical reduction), isolation and embedding methods, thermal separation methods, electrical remediation methods, microbial remediation methods, phytoremediation methods, adsorption methods and cleaning methods. methods, etc., but these methods have certain limitations

However, the current soil remediation technology generally has the defects of high cost, serious secondary pollution, complicated operation and long repair period.

The chemical method changes the nature of the soil, the treatment cost is high, and there is secondary pollution. The isolation and embedding method only isolates the heavy metals, which still has potential dangers to the soil ecology; the technology of the electric restoration method is relatively immature; the thermal separation method is not suitable On-site operation has high treatment costs and narrow scope of application; the carrier used by the microbial remediation method is living microorganisms, and the discontinuous distribution of pollutants will block the movement of microorganisms, so the treatment cycle is long, and it is easy to compete with indigenous microorganisms for organic nutrients as substrates. Loss of activity; phytoremediation has a long repair period (decades or even hundreds of years), and there are problems with subsequent treatment of plants; electrical remediation is only suitable for small areas of pollution, and on-site operation is difficult; adsorption methods are prone to saturation, high cost, and high efficiency. Low disadvantages; Compared with the above other methods, the cleaning method has the advantages of short cycle and low cost, but when using chemical reagents, it is easy to affect the soil environment and cause secondary pollution