Novel electrokinetic intensified technology and process for biologically remedying polycyclic aromatic hydrocarbon polluted soil

Abstract

The invention discloses a novel electrokinetic intensified technology and process for biologically remedying polycyclic aromatic hydrocarbon polluted soil, which successfully introduces nutrients and microorganisms into a reaction zone to degrade target pollutant, provides advantages for in situ bioremediation of the soil polluted by organic pollutant, and promotes research on electrokinetic remediation and in situ bioremediation. The process is the combined application of electrode switch and electrolyte mixture circulation of two electrodes in electrokinetic remediation; when the voltage gradient is 1 V / cm, the electrokinetic intensified remedying test is performed by adopting a motion manner of periodically changing electric field direction, when the electrode switch time is 12 h, the electrolyte is bacterium suspension (comprising nutrients), the pH value is 7.3, and the flow speed of the circular electrolyte is 800 ml / h. Test result indicates that the nutrients and the microorganisms can be introduced into the zone to be remedied by the novel electrokinetic intensified biologically remedying process, the target pollutant can be degraded, and the problems of easiness in change of soil pH value and nonuniform distribution of nutrients in conventional electrokinetic remediation are solved, and the bioremediation efficiency is increased by 55%, thus providing advantages to the in situ bioremediation of the soil polluted by organic pollutant, and effectively improving the bioremediation efficiency.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to the technical field of bioremediation of soil polluted by organic matter by adopting electrodynamic restoration technology. Background technique [0002] Soil is the basis for human survival and development, and it is also an important part of the human ecological environment. Soil pollution can be roughly divided into: heavy metal pollution, pesticide and organic pollution, radioactive pollution, pathogenic bacteria pollution and other types. Among them, soil organic chemicals, as the main pollutants affecting the soil environment, have become the focus of international attention. Toxic and harmful organic compounds accumulate in the environment, and may bring harm to the entire ecosystem in a certain period of time or under certain conditions. disastrous consequences. [0003] Compared with the traditional physical and chemical methods for remedia...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of in-situ bioremediation of organic pollutant-contaminated sites, lack of nutrients and unevenness, and the low efficiency of introducing microorganisms, and provide a process and its parameters for applying electrodynamically enhanced bioremediation of polycyclic aromatic hydrocarbon-contaminated soils, which are effective Increased efficiency of bioremediation

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