标题：OPERATING PARAMETERS OPTIMAL SCHEME AND FEASIBILITY RESEARCH OF ENHANCINGSTRATEGIES FOR ELECTRO-KINETIC REMEDIATION ON
LEAD-POLLUTED ESTUARY SEDIMENTS TREATMENT
摘要：The accumulation of lead (Pb)in sediments re-sulted from substandard discharge of industrial and agricultural sewage hold serious threat to agro-ecol-ogy and human health during its recycling process. Electro-kinetic remediation (EKR)is a promising technique for Pb decontamination in porous matrix while pH polarization remains to be the main obsta-cle for its widespread application. In this study, lab-scale EKR experiments were conducted with en-hanced strategies of non-uniform electric intensity (NEI), polarity reversal (PR)and electrolyte condi-tioning (EC). From the obtained results, all the strat-egies could alleviate the pH polarization of sedi-ments and increase the removal of Pb by 6.2-37.4%. Operating parameters ofelectric intensity (EI),elec-trode exchange frequency and electrolyte type were optimized and determined to be 1.0 V/cm,24 h/time and 0.1 M HAc, respectively.Higher extraction effi-ciencies of Pb(75-86%)were reached when em-ployed the enhanced EKR and the optimal result was observed when applied the NEI, PR and EC strate-gies simultaneously. The remediation duration, en-ergy utilization efficiency and energy cost of EKR with optimal enhanced scheme to remove all sedi-ment Pb was evaluated to be in an acceptable value of178.2h.42.3 mg/kWh and $0.65/kg,respectively. The methodology and results in this study might pro-vide theoretical foundation to support the designa-tion ofEKR in full-scale applications.
