Phytoremediation device for cadmium-lead composite contaminated soil

Abstract

The invention relates to a phytoremediation device for cadmium-lead composite contaminated soil. The device at least comprises a remediation frame body, an isolation net layer, a soil containing groove, a planting and breeding soil layer and a reagent storage tank. The reagent storage tank is communicated with a reagent mixing and stirring device arranged outside the remediation frame body. Contaminated soil contained in the soil containing groove adsorbs a reagent mixed liquid added into the reagent storage tank from bottom to top. A root cutting device for cutting capillary roots, growing downwards, of plants is arranged between the top of the soil containing groove and the isolation net layer. The roots of the plants grow downwards to restore the contaminated soil needing to be restoredfrom top to bottom, the restoration reagent in the reagent storage tank permeates upwards through the contaminated soil and restores the contaminated soil from bottom to top, so that the soil restoration efficiency is effectively improved, the soil on the upper layer and the soil on the lower layer can be completely restored, and the fault phenomenon that the upper layer is completely repaired and the lower layer is incompletely repaired is avoided.

Description

technical field [0001] The invention relates to the field of heavy metal soil restoration, in particular to a phytoremediation device for cadmium-lead compound polluted soil. Background technique [0002] With the rapid development of urban economy, soil pollution is becoming more and more serious, and the soil resources that can be used for agriculture and forestry development are becoming more and more scarce. In order to solve this problem, people began to lock the soil source to polluted soil, such as heavy metals in mines Inorganic and organic pollution of soil caused by polluted soil, industrial and agricultural waste and waste water. [0003] Heavy metals in polluted soil are difficult to degrade, and there is no special device for restoration. Even if there is a related restoration device, its functionality is relatively simple, and it is very inconvenient to use. The transformation of pollutants in the soil by plants will reduce the number of microorganisms in the ...

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Problems solved by technology

[0003] Heavy metals in polluted soil are difficult to degrade, and there is no special device for restoration. Even if there is a related restoration device, its functionality is relatively simple, and it is very inconvenient to use. The transformation of pollutants in the soil by plants will reduce the number of microorganisms in the soil and the activity of soil enzymes, which will lead to the degradation of the soil and is not suitable for mass production.

[0004] For the current phytoremediation process of this method, some heavy metal soil remediation agents or bacterial liquids will be added to assist phytoremediation during phytoremediation, but when adding heavy metal soil remediation agents or bacterial liquids, the surface layer of planting plants is added, resulting in The upper layer of the repaired soil can be completely repaired, while the restoration effect of the lower part of the soil is relatively poor. At the same time, during the restoration process, the repaired plants can only repair the soil once, and cannot be repaired twice or more When a repair is completed, the plants will either continue to grow in the repaired soil, or be removed from the repaired soil, and all the soil in the entire repair device will be introduced into the planting site for a new round of soil repair. It brings great inconvenience to soil repair, and at the same time, the plants repairing the soil cannot be repaired multiple times, resulting in great waste

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