Permeable Reactive Barrier And Electric Technology Remediate Groundwater And Soil Polluted By Heavy Metal

In this paper, the laboratory from soil and groundwater contamination withheavy metals for the study, we design PRB reactor repair laboratory simulation ofheavy metal pollution of groundwater At the same time, the heavy-metalcontamination of soil electrokinetic remediation and electric-penetration reactivebarrier technology.The main content and the results are as follows:(1)The mixed medium PRB presence of cations and anions in the form of Cu(Ⅱ) and Cr (Ⅵ) in groundwater removal of heavy metal has a very good effect，Which is95.78%removal rate of Cr (Ⅵ), for Cu (Ⅱ) removal rate reached95.10%,effluent pH up to about8.5, ORP below-100mV.(2) Calcium carbide slag and apatite, respectively, as the reaction mediumPRB, through the analysis of experimental results, two reactor has a goodremediation for groundwater,which is polluted by the Cu (II) and Cr (Ⅵ), as thereaction medium by carbide slag PRB average removal rate of about95.9%Cu (Ⅱ),the average removal rate of Cr (Ⅵ) to about95.5%. Apatite as reaction mediumPRB can even average removal rate of Cu (Ⅱ)99.3%, less effective removal of Cr(Ⅵ), the average removal rate of76.0%. The analysis indicated that using carbideslag and apatite mixed media PRB repair groundwater heavy metal pollution withsignificant effects.(3) Electrokinetic remediation of heavy metal contaminated soil experimentsshowed that Cu (II) and Cr (Ⅵ) removal rate is rising with the increase in theapplied voltage of the electrolytic cell, However,when the voltage is15v(1.25v/cm), Cu (Ⅱ) and Cr (Ⅵ) removal rate falling instead of rising, Thisexperiment to determine the optimal repair voltage12v(1.0vc/m). Soil moisturecontent on electric repair of heavy metal pollution of soil has a great influence, Inelectric repair experiments, increase the moisture content of soil, is advantageousto the Cu in the soil (Ⅱ) and Cr (Ⅵ) migration. High and low soil pH will be agreat impact on electrokinetic remediation experiments, In this experiment, whenthe repair voltage12v, soil moisture content of30%, the repair time of6days, thecathode pH control in about6, the soil pH is reduced to about4, Cu (II) Theaverage removal rate of78.7%, the average removal rate of Cr (VI) up to79.0%.But the soil pH is too low, the removal rate of Cu (II) and Cr (Ⅵ) not only does not decrease but also increase. In electrokinetic remediation experimental, catholyteafter power will produce a large number of OH-1, leading to a rise in pH of thecatholyte, which is not conducive to the removal of Cu (Ⅱ),so Required Titaniumcontrol the catholyte at about6.(4)Calcium carbide slag and apatite high removal of Cu (Ⅱ) and Cr (Ⅵ),however, electric-permeable reactive wall repair soil experiments,because the thecarbide slag main ingredient is calcium oxide, If we select it as the active materialof the experimental PRB will make the soil pH increased, And produce OH-1precipitation and soil copper ions, which will be impact of the removal of Cu (Ⅱ).So we chose apatite as the the PRB activity of materials and electric technologyjoint to repair heavy metal contaminated soil. Analysis shows the experimentalresults, the union of the two technologies on soil Cu (II) and of Cr (VI) with highremoval rate, removal rate of Cu (Ⅱ) was84.6%, the removal rate of Cr (Ⅵ) canreach83.4%.