| Title: | Enhanced removal of tetrachloroethylene from aqueous solutions by biodegradation coupled with nZVI modified by layered double hydroxide |
| Author(s): | Wang Q; Song X; Tang S; Yu L; |
| Address: | "Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 21008, China. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 21008, China. Electronic address: xsong@issas.ac.cn. Key Laboratory of Soil Environment and Pollution Remediation, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, 21008, China; University of Chinese Academy of Sciences, Beijing, 100049, China. Department of Environmental Engineering, Nanjing Forestry University, Nanjing, 210037, China" |
| DOI: | 10.1016/j.chemosphere.2019.125260 |
| ISSN/ISBN: | 1879-1298 (Electronic) 0045-6535 (Linking) |
| Abstract: | "Chlorinated volatile organic compounds, such as tetrachloroethylene (PCE), are the most commonly detected toxic contaminants in groundwater. In this study, the performance of PCE removal by a microbial consortium combined with nZVI modified by layered double hydroxide (nZVI-LDH) was evaluated. The enriched PCE-degrading consortium consisted of 44.49% Clostridium and other potential PCE degraders, and 0.5-2.5?ª+mg/L PCE was completely biodegraded within 4 days. The characterization of nZVI-LDH indicated that LDH was coated on the surfaces of nZVI particles with an increased surface area. The PCE removal kinetics by nZVI-LDH was well described by a second-order model, and the removal rate constant of nZVI-LDH was 0.12?ª+L?ª+h/mg, higher than that of native nZVI (0.02?ª+L?ª+h/mg). Interestingly, the presence of Cu(2+) improved the removal efficiency of PCE by nZVI-LDH, owing to its role as a catalyst or medium for charge transfer during reduction. Removal of PCE was enhanced by coupling the PCE-degrading consortium and nZVI-LDH. The initial removal of PCE was mainly dominated by the abiotic degradation and adsorption of nZVI-LDH, and biodegradation then played a major role in the exhaustion of nZVI-LDH. These results suggest that biodegradation coupled with nZVI-LDH has a great potential for applications in the remediation of chlorinated-solvent contaminated groundwater" |
| Keywords: | "Adsorption Environmental Restoration and Remediation/*methods Groundwater/*chemistry/microbiology Halogenation Hydroxides/chemistry Iron/chemistry Kinetics Metal Nanoparticles/chemistry Tetrachloroethylene/analysis/*metabolism Water Pollutants, Chemical/a;" |
| Notes: | "MedlineWang, Qing Song, Xin Tang, Shiyue Yu, Lei eng England 2019/11/18 Chemosphere. 2020 Mar; 243:125260. doi: 10.1016/j.chemosphere.2019.125260. Epub 2019 Nov 6" |
