Ex-situ soil washing solid-liquid separation device and process

Abstract

The invention discloses an ex-situ soil washing solid-liquid separation process. The process takes loading flocculation as a core, and the produced floc is compact in structure, void water content, fast in settling and excellent in uniformity and is applicable to solid-liquid separation of ex-situ soil washing mixed solutions. The mixed solution enters a loading flocculation area in main equipmentfor flocculating under the pressure effect, then floc enters a settling zone and a sludge thickening area, the sludge is concentrated and discharged and is treated by a subsequent dehydration processfor backfill. Clean water enters a settling section and a sloping plate zone and outflows via an orifice master gully and a water collection tank, and the effluent is discharged or recycled. During process operation, for a superposed layer nearby a water outlet of the flocculation zone, small floc and one part of soluble organic matters can be removed. The process integrates multiple process units such as a loading flocculation unit, a settling unit, a clarifying unit, and a sludge thickening unit, and the integration level of the main equipment is improved; the degree of automation is high,the application range is wide, the capital investment and operation cost is low, the floor space is small, and the operation is simple.

Description

technical field [0001] The invention relates to a solid-liquid separation device suitable for ectopic soil leaching, which is used for solid-liquid separation of mixed liquid in a soil leaching tank, and especially relates to a high-efficiency solid-liquid separation process as the core to achieve efficient and stable separation effects, It can be widely used in the solid-liquid separation of the mixed solution of the washing tank in the soil remediation site polluted by heavy metals, semi-volatile organic compounds, low-volatile organic compounds and other pollutants. Background technique [0002] Ex-situ soil leaching technology is a technology that uses physical separation or leaching to separate heavily polluted soil components or transfer pollutants from the soil phase to the liquid phase by adding water or a suitable eluent. The ex-situ soil leaching process has attracted extensive attention in recent years due to its advantages such as fast repair speed, good effect, ...

AI Technical Summary

Problems solved by technology

[0006] To sum up, for the solid-liquid separation process of ectopic soil leaching, so far there has been no solid-liquid separation process that can not only achieve satisfactory treatment effect, but also maintain a long working cycle, simple process, small footprint, convenient operation and low cost. Approach

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