Research Of EK Remediate PAHs-contaminated Soil And The Feasibility Of Laccase As EK Coupled Techniques

Environmental harm by sites contaminated with Polycylic AromaticHydrocarbons (PAHs) is a major problem to the world. This can be effectivelymitigated by Electrokinetics (EK) technology which as a new soil remediationtechnology. In this paper, the remediation of EK technology alone and its enhancedtechnology were studied, the feasibility of laccase as EK coupled techniques waselaborated, and provided the experimental and theoretical foundation for practicalapplication of a combined EK/laccase process.Phenanthrene and anthracene were chosen as typical pollutant. The characteristicand the mechanism of phenanthrene and anthracene migration under anolyte enhancedand non-uniform field electrokinetic remediation technologies were analyzed. Due tothe easy deactivation of laccase, the method of improve the stability of laccase wasstudied. The main research conclusions are as follows:Electrodynamics process can effectively promote the desorption and migration ofphenanthrene in soil and the migration effect is closely related to the way of electricfield. Phenanthrene in kaolin has no apparent migration effect under uniform field, butthere has apparent migration effect in non-uniform field. Phenanthrene can migrate toa larger electrode area in non-uniform field. The main mechanism of phenanthrene insoil is dielectric migration under non-uniform field.Electrodynamics method made a minimal migration effect to anthracene in soil.Very little anthracene was taken to the near of cathode by the migration ofelectroosmotic fiow.The stability against high temperature and acid-base of modified laccase wereefficient improved by macromolecular modification. The stability of Modified laccaseDex-lac is higer than SA-lac. Tts suitable catalytic pH range widen to pH3.5~5.