A soil remediation device for soil polluted by heavy metals

Abstract

Disclosed is a soil remediation device for a heavy metal-contaminated soil, comprising a mud tank (1), a leaching tank (2), a wet-dry mixer (3), and a sludge dewatering and drying device (4); a base (5) and a mud inlet pipe (601), a mud backflow pipe (602), a sludge two-way pipe (603), a leached sludge-discharging pipe (604), and a sludge dewatering and drying sludge pipe (605). The soil to be treated is put into the mud tank (1), and after the preparation of mud is completed, the mud is introduced into the leaching tank (2) for leaching through the mud inlet pipe (601), and the leached sludge is discharged into the wet-dry sludge mixer (3) through the leached sludge-discharging pipe (604); and the remaining sludge treated via the sludge dewatering and drying device (4) is introduced into the wet-dry sludge mixer (3) through the dewatering and drying sludge pipe (605) and is mixed with the leached sludge, and the uniformly mixed sludge is then discharged. The device can not only reduce the moisture content of mud, but can also improve the organic matter content and the fertility of soil.

Description

technical field [0001] The invention relates to a soil restoration device, in particular to a soil restoration device for soil polluted by heavy metals. Background technique [0002] The current treatment of heavy metal pollution has become an urgent global environmental problem. Among them, water pollution mainly refers to the pollution of water bodies (including rivers, lakes, reservoirs, oceans, industrial water, discharge water and domestic drinking water, etc.) by heavy metal pollutants, including cadmium, lead, mercury, chromium, arsenic, etc. It is mainly industrial wastewater, such as wastewater discharged from mineral processing plants, electroplating plants, and steel plants. [0003] In addition to the heavy metals contained in the soil itself, the rest are due to the pollution of heavy metals into the soil. Soil heavy metal pollution mainly comes from three aspects: the deposition of heavy metals in the atmosphere, for example, waste gas from industrial product...

AI Technical Summary

Problems solved by technology

Soil heavy metal pollution mainly comes from three aspects: the deposition of heavy metals in the atmosphere, for example, waste gas from industrial production, lead-containing automobile exhaust, etc. enter the soil through natural deposition and rain deposition; irrigation with heavy metal-containing sewage results in heavy Cd in the soil , As, Cu, etc.; in addition, plastic films used in daily life, chemical fertilizers and pesticides used in agriculture also lead to soil pollution

[0004] Chemical methods will have a destructive effect on soil properties. Nitrogen, phosphorus, and organic matter in the soil will be lost through leaching and other steps, making it difficult to backfill as normal soil. If it is used on a large area, it will inevitably cause water and soil loss.

[0005] In recent years, phytoremediation technology has become one of the research hotspots in the remediation of heavy metal pollution. Compared with other remediation technologies, it has the characteristics of low cost, easy operation and management, and no secondary pollution. However, most of the heavy metals found so far are enriched Plants have weak reproductive ability, slow growth, and small aboveground biomass, which are limited in practical application; in addition, most of the heavy metals in the soil are combined with solid phases and are difficult to be absorbed and utilized by restoration plants, resulting in low restoration efficiency and restoration. Long time, not suitable for long-term development and use

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