A washing and repairing process for organic polluted soil

Abstract

The invention relates to a washing and repairing treatment process of organic polluted soil, which belongs to the treatment process of polluted soil. Sieve the polluted soil with 100mm, and the products larger than 50mm enter the dynamic sieve jigging system for organic matter removal and separation to obtain large pieces of crushed aggregate and light products; ‑50mm products enter the jig machine for organic matter removal and separation , to obtain small pieces of crushed aggregate and light products; the washing water formed by the jigging system is classified and concentrated by the grading cyclone group, and the underflow is sorted by a spiral separator to obtain coarse crushed aggregate, and the overflow enters the first stage of concentration The machine undergoes free sedimentation to obtain fine-grained crushed aggregate. The overflow of the first stage thickener enters the mixing tank to mix with coal powder, and then enters the flotation equipment for flotation. The foam product is press-filtered to obtain coal powder, filtrate and flotation slurry. Enter the second thickener, add coagulant and flocculant to promote the settlement of the soil, and get the treated soil. The technological process is relatively simple, low energy consumption, and low processing cost. The pulverized coal used can still be used as electric coal to generate electricity after adsorption, without causing secondary pollution.

Description

technical field [0001] The invention relates to a process for treating polluted soil, in particular to a process for washing and repairing organic polluted soil. [0002] technical background [0003] Soil is the natural resource that human beings rely on for survival, and it is also the material basis for human beings to obtain food and other resources. With the acceleration of my country's urbanization process and the adjustment of industrial structure, the spatial layout of cities has changed, and a large number of chemical plants, petroleum refineries, and pesticide plants in the original cities have moved to the suburbs. These factories have produced organic pollution to the underground soil during the production process. The soil after relocation cannot meet the requirements of reuse without treatment, and needs to be repaired before reuse. [0004] There are many types of organic pollutants in organic polluted soil, mainly including petroleum, polycyclic aromatic hydr...

AI Technical Summary

Problems solved by technology

The current technologies mainly include incineration, thermal desorption, soil steam extraction, heat treatment and other methods, which have disadvantages such as high cost, low efficiency and complicated process.

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