Method for restoring heavy metal contaminated soil through activating agent and microorganism reinforced plants

Abstract

The invention provides a method for restoring heavy metal contaminated soil through an activating agent and microorganism reinforced plants. The method includes the following steps that firstly, the activating agent is added to the heavy metal contaminated soil, and the soil is tilled evenly and activated for 10 d to 20 d; secondly, complex microorganisms are inoculated in the activated soil, castor oil plants are planted for 1 to 2 periods, and one year is a period; thirdly, the castor oil plants planted in the second step are completely removed from the soil, the activating agent is added, and the soil is activated for 10 d to 20 d; fourthly, nightshade is planted in the soil activated in the third step for 2 to 3 periods, and one year is a period; fifthly, heavy metal in the castor oil plants obtained in the second step and the nightshade obtained in the third step is recycled; and sixthly, the first step to the fifth step are cycled till the content of the heavy metal in the soil reaches the standard. By the adoption of the method for restoring the heavy metal contaminated soil, the soil can be activated and improved, cost is low, contamination is small, and the heavy metal in the soil is efficiently removed.

Description

technical field [0001] The invention relates to the field of contaminated soil treatment, in particular to a method for remediating heavy metal-contaminated soil with an activator and microorganism-enhanced plants. Background technique [0002] Soil heavy metal pollution is a major ecological and environmental problem faced by human beings. Heavy metals stay in the soil for a long time, are difficult to be degraded by plants and microorganisms, and are easily accumulated in the usable parts of crops and passed on to humans through the food chain, causing serious damage to human health. great harm. The heavy metals that cause soil pollution mainly include As, Cd, Cr, Cu, Hg, Pb, Zn, etc. The main source of soil heavy metal pollution is the waste discharged by human beings in life and industrial and agricultural production, such as domestic sewage and domestic garbage. The infiltration of heavy metals contained in the soil, the abuse of pesticides and fertilizers in agricultu...

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Problems solved by technology

The chemical solidification method can only temporarily fix heavy metals in the soil and reduce heavy metals entering the human body through plants, but it cannot completely remove heavy metals from the soil, and there are hidden dangers; soil leaching method can reduce the availability of heavy metals to plants, but At the same time, a large amount of nutrients will be lost in the soil, and the use of chemical leaching may also lead to acidification or alkalization of the soil; while the cost of electrochemical restoration is relatively high, and the implementation conditions are relatively harsh; and the use of phytoremediation The method is to remove heavy metals from the soil through plant system absorption, accumulation, and volatilization to reduce heavy metal pollution. The cost of this method is relatively low, and it is green and environmentally friendly; Heavy metals are divided into absorbable state, exchange state and refractory state. Heavy metals in a refractory state cannot be absorbed by plants, and different plants have different accumulations of different heavy metals.

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