Contaminated soil leaching treatment system and method

Abstract

The invention discloses a contaminated soil leaching treatment system and method, wherein the system comprises a pre-screening device, a feeding device and leaching main body equipment; the pre-screening device is used for carrying out pre-screening treatment of contaminated soil, and screening out large-particle-size components; the feeding device is used for feeding the pre-screened contaminatedsoil into the leaching main body equipment; the leaching main body equipment is used for carrying out multi-stage leaching and screening on the contaminated soil, screened multi-stage clean solid components are piled up to be detected, and the screened small-particle-size components are subjected to primary leaching and primary solid-liquid separation; an upper-layer liquid subjected to primary separation is sent into a wastewater treatment device, and lower-layer slurry is subjected to secondary leaching and secondary solid-liquid separation; the liquid subjected to secondary separation returns to a multi-stage leaching and screening system, and the separated small-particle-size clean solid components are stacked for detection. While the solid-to-liquid ratio is guaranteed, most of waterin the equipment can be recycled, and the water consumption and the wastewater disposal amount are reduced; the system can realize parallel multistage treatment, reduce the residence time of pollutedsoil in single equipment, and improve the treatment efficiency of the system.

Description

Technical field[0001]The invention relates to the technical field of contaminated soil remediation, in particular to a contaminated soil leaching disposal system and method.Background technique[0002]In recent years, the domestic contaminated soil remediation industry has developed rapidly, and the remediation technology system has become more complete and standardized. Among the many contaminated soil remediation technologies, soil leaching technology is used to treat heavy metal contaminated soil or combined with other technologies to treat compound contaminated soil.[0003]The current soil washing and remediation system has some serious defects. For example, the soil composition is complicated and the water content is high in the actual project. The mechanical load at the feed end and the whole washing process is likely to cause fluctuations in the mechanical load, which affects the overall Construction efficiency; a higher liquid-to-solid ratio increases the loss of water resource...

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Problems solved by technology

[0003] The current soil leaching repair system has some serious defects. For example, in actual engineering, the soil composition is complex and the moisture content is high. It is easy to cause high and low mechanical loads at the feed end and the whole process of leaching, which affects the overall Construction efficiency; high liquid-solid ratio increases the loss of water resources, and at the same time increases the burden of water treatment; the leaching treatment takes a long time, which restricts the equipment's disposal capacity and efficiency, etc.

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