Research On EK Enhanced Remediation Of Quinoline Contaminated Soils And Microwave Irradiation Treatment Of Quinoline Wastewater

The problem of soil contamination by refractory organic is increasingly serious.Unfortunately, traditional remediation techniques have many deficiencies. Electrokinetictechnology as a new soil remediation technology, because of its safety, efficiency and nosecondary pollution, has a great development potentiality. Quinoline was chosen as a typicalpollutant. The feasibility of using anolyte enhanced and non-uniform electric field enhancedelectrokinetic remediation technologies to migrate quinoline in soil was investigated. Thecharacteristic and the mechanism of quinoline migration under two kinds of electrokineticenhanced remediation technologies were analyzed. The affecting factors and the system energyconsumption of two kinds of enhanced electrokinetic remediation technologies were discussed.Then, microwave-MnO2radiation technology was used for removing quinoline migrated to theelectrolyte. The optimum conditions and the possible ways of quinoline degradation wereinvestigated. The main research conclusions are as follows:Electrokinetic enhanced technology remediation of quinoline-contaminated soil is feasible.When the voltage gradient is constant, migration effect of quinoline is preoperational to theconcentration of anolyte buffer and the working time of device. Electro-migration andelectro-osmosis are the main mechanisms with driving quinoline towards the cathode.Non-uniform electrokinetic remediation technology can effectively stimulate the migrationof quinoline in the tested soils. Compared with uniform electrokinetic remediation technology, ithas less effect on soil properties (pH, moisturecontent, conductivity) and lower consumption insystem energy.In the experiment of microwave-MnO2radiation, quinoline is rapidly degraded by the effectof adsorption-oxidation on the surface of MnO2. The process of treatment approximately meetsthe first-order kinetics reaction. For the100mg/L quinoline, the optimal conditions of treatmentare0.7gMnO2/L wastewater,5of initial pH,500W microwave power and5min irradiation. Thequinoline removal rate is up to92.5%and the CODCrremoval rate is up to90.4%.