Method for treating heavy metal-polluted soil

Abstract

The invention discloses a method for treating heavy metal-polluted soil. The method comprises the following steps of 1, heavy metal passivation: sprinkling a soil conditioner to heavy metal-polluted soil to adjust soil pH and passivate heavy metals in the soil, and 2, soil microbe system reconstruction: before crop plantation and/or in crop plantation, spraying a microbe preparation to reconstruct a soil microbe system. The method has simple and easy processes, a low cost and a wide application range, is suitable for popularization, can fast treat heavy metal-polluted soil and is suitable for crop plantation.

Description

technical field [0001] The invention relates to the field of heavy metal pollution control, in particular to a method for treating heavy metal polluted soil. Background technique [0002] Heavy metal pollution in the environment has the characteristics of concealment, long-term and irreversibility. The pollutants have poor mobility in the medium, long residence time, cannot be degraded by microorganisms, and can also be transmitted through the food chain, eventually affecting human health. Now, due to geological causes and Human activities, heavy metals such as cadmium pollute rice fields, wheat fields, corn fields and other farmland ecosystems. Heavy metals are ingested by the human body through the food chain in a shorter cycle, posing a great threat to human health. In order to control heavy metal pollution and reduce the amount of heavy metals entering plants, people have done a lot of research, and the main methods are the following two: one is to transform the heav...

AI Technical Summary

Problems solved by technology

[0005] 1) The soil conditioner is sprinkled in the soil at one time when plowing, and the microorganisms in it are used to reduce the heavy metal ion cadmium Cd + The mobility, on the one hand, requires a large number of microorganisms, and the cost is high. On the other hand, the microorganisms are applied to the soil prematurely, and may die. After planting the plants, the heavy metals recover their activity and enter the plants in the later stage of plant growth;

[0006] 2) The main reason for excessive heavy metals in polluted soil is that natural water bodies are polluted by heavy metals, and there is no monitoring of heavy metal content in water. Simply treating the soil will easily cause secondary pollution, and it is difficult or costly to reduce the absorption of heavy metals by plants.

[0007] 3) Even if it is treated, heavy metals will enter the plants and grow crops, which will enter the human body through the food chain and affect health; if no crops are planted during the treatment period, land resources will be wasted, and land owners will not be able to obtain economic income through the land, making it difficult to popularize and apply