Research On Heavy Metal-contaminated Soils In Situ Through One-way Pulse Electrophoresis Remediation Method

Under the current condition of the disharmonic relationship between the economic development and environmental protection, soils contaminated by heavy metals in our national agriculture are worsening increasingly. Contaminated Soil is accumulative, lagging, dormant, and irreversible. Therefore, Contaminated Soil is usually difficult to be remedied and treated. For the heavy metal ions of agricultural soils contaminated enter the human body and endanger their healths indirectly through the crop's absorption easily, soil contaminated by heavy metals is one of the environmental problems that should be resolved urgently.Elecreoremediation technique is a new electrochemistry remediation technology gradually developing in recent years for dealing with heavy metal-contaminated soils .. in situ, and it is an advancing task of global environment science and technology. Its principle is that: application of direct electric current via electrodes immersed in a saturated soil results in oxidation at the anode, generating an acid front that cause desorption and dissolution of heavy metals. The desorped and dissoluted heavy metals are migrated toward cathode reservoir by electric field and ions concentration grads by the means of electromigration, electroosmosis and diffusing. Elecreoremediation technique not only solves the treatment problem of soil pollution, but provides theoretical guidance and technical support for the sludge in the city's wastewater treatment plant and the removal of heavy metals in the municipal solid waste. and It is of great practical value and broad prospects for development of a new pollution control technology.The most difficulty of electrokinetic remediation technology in soil contaminated by heavy metals is that polarization in soil remediation process through direct current will lead to an increase in energy consumption, influence of reduced repair and extension of remediation time. Therefore, the research for more advanced electrochemistry in situ soil and power for soil remediation and its corresponding method will be of important direction for enhancing high efficiency of electrochemical in situ soil, This paper will depend on the above as a research subject.On the basis of the corresponding results of the tutor's researchs, the comparative experiments on heavy metal-contaminated soils in situ of both direct current and one-way pulse electrophoresis method are studied. And their aims are to explore the research on one-way pulse electrophoresis remediation method for being applied to contaminated soil and further reseach of the feasibility of practical applications of the new method.Under the completely same condition of strictly controlled soil remediation, The results of the experiments showed that within the range of this article's research, the time of the removal efficiency of one-way pulse electrophoresis at both same voltages and others conditions rises by 5.0%to 28.8%;on the other hand ,the remediation time of one-way pulse electrophoresis, compared with direct current, was shorten by 7.01% to 42.3% at the same removal efficiency ; Seen from above, it can low energy consumption and has a great prospect in the industry.