Open AccessExperimental study on electrokinetic remediation of Pb-contaminated kaolinite
Author(s) -
Gang Li,
Jia Liu,
Jinli Zhang
Publication year - 2020
Publication title -
iop conference series. earth and environmental science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.179
H-Index - 26
eISSN - 1755-1307
pISSN - 1755-1315
DOI - 10.1088/1755-1315/467/1/012181
Subject(s) - electrokinetic remediation , kaolinite , environmental remediation , electrokinetic phenomena , anode , calcareous , contamination , environmental chemistry , chemistry , environmental engineering , environmental science , mineralogy , geology , electrode , paleontology , ecology , biology
The treatment of heavy metal pollution by electrokinetic remediation has the characteristics of low cost, easy operation and less secondary pollution and has broad application prospects. Electrokinetic remediation tests, and some combined with a permeable absorbing layer were conducted to analyze the distribution patterns of conductivity, Pb(II), pH and moisture content in lead (Pb)-contaminated kaolinite. The influences of factors such as remediation time, type of fillers and location of a permeable adsorbing layer on the remediation effects of Pb-contaminated kaolinite were explored. The results reveal that the soil water content decreases with increasing energization time and that the water content near an anode chamber was highest, whereas that near a cathode chamber was lowest. When the test was conducted for 7 days, the conductivity near the cathode side was relatively high, whereas the Pb near the anode side was largely removed. Prolonged energization time was conducive to the removal of Pb. In an electrokinetic test, no alkaline region was detected in kaolinite. When a permeable adsorbing layer was placed in the middle of a soil sample, the removal effect was the best. Compared with bone char, a permeable adsorbing layer of calcareous sand significantly improved the Pb removal rate and effectively reduced energy consumption.