Polychlorinated biphenyl contaminated soil treatment method

Abstract

The invention provides a polychlorinated biphenyl contaminated soil treatment method comprising the following step (1) of preparation of eluents: preparing the eluents according to the quality of soilto be remediated; the step (2) of chemical leaching treatment: excavating the soil to be remediated and conveying the soil into a mixer, and stirring the soil while spraying; the step (3) of microbial degradation: fully mixing and stirring indigenous microorganisms and biological promotors, and injecting the mixtures into the soil with a spraying or injection method; singly spraying or injectingthe biological promotors for the second time after 5-7 days, and spraying or injecting the biological promotors by half everyday in the following days and lasting for 25-30 days; the step (4) of bottom remediation and isolation: forming a solidified layer at the bottom of contaminated soil by mixing Fenton reagents, zero-valent iron and cement; and the step (5) of soil backfilling. According to the treatment method, by adopting the technological method of chemical leaching, microbial degradation and bottom isolation, the problem that the pollution cleanup is incomplete in the prior art is solved; the treatment method has the advantages of low treatment cost, high efficiency and no secondary pollution, and is widely applied for polychlorinated biphenyl pollution treatment cooperatively.

Description

technical field [0001] The invention relates to chemical technology, in particular to a treatment method for polychlorinated biphenyl polluted soil. Background technique [0002] Polychlorinated biphenyls (PCBs) are the main pollutants in the soil in areas where electronic waste is dismantled and burned. It is a synthetic organic compound produced by replacing the hydrogen atoms on the biphenyl ring with chlorine atoms. PCBs are a typical Persistent organic substances (POPS) have excellent properties such as chemical inertness, insulation, non-flammability, and acid and alkali resistance due to their double phenyl ring structure. At the same time, polychlorinated biphenyls have been widely used as an industrial product. As heat carrier, plasticizer, high-temperature lubricant, paint and ink additives, insulating materials for capacitors and transformers, etc., the wide use of polychlorinated biphenyls in industry has caused global environmental pollution problems. [0003] ...

AI Technical Summary

Problems solved by technology

[0004] In view of the above-mentioned situation, the object of the present invention is to provide a kind of treatment method of polychlorinated biphenyl polluted soil, it adopts the process method of chemical leaching, microbial degradation and bottom barrier to overcome the problem of incomplete pollution removal in the prior art, and treat Low cost, high efficiency, no secondary pollution, no damage to the original soil environment, simple operation steps, broad market prospects, and easy promotion and use