The performance of biochar/nZVI composite in remediating trichloroethylene contaminated groundwater
The column test and permeability test were carried out to explore the biochar/nZVI composite removal effect on trichloroethylene and the permeability of the BC-nZVI composite.The results show biochar/nZVI composite for TCE removal rate can reach more than 90％in 2h,close to 100％at 10h.The removal rate gradually declined with the consumption of Biochar/nZVI composite;however,it maintained a noticeable remediation effect within 24hours,and the removal rate remained at over 90％but decreased to 73.96％after 72h.In the PRB system,the reaction medium material migrates under the long-term water flow,and the stability of the BC-nZVI composite decreases with the decrease in the iron ratio.Compared with pure BC material,the migration and loss of 5BC-1nZVI material were relatively low under continuous 3-day seepage.The microscopic results show that the BC-nZVI composite can be successfully synthesized by the ball milling method,and it was found that after ball milling,nZVI particles have a certain degree of oxidation.Due to the adhesion of degradation products by the reaction of BC-nZVI composites with TCE,a white film will be formed on the surface of the carbon-iron material,and the pore size decreases;hence,the removal efficiency of BC-nZVI composites for TCE decreases.
万方数据
维普
