Remediation of PBDEs-metal co-contaminated soil by the combination of metal stabilization, persulfate oxidation and bioremediation.
Laboratory experiments were performed to investigate the efficiency of a simultaneous metal stabilization, persulfate oxidation and bioremediation for decontaminating polybrominated diphenyl ethers (PBDEs) and toxic metals from an actual soil polluted by the recycling activity of electronic waste. Biochar and bentonite were applied to the soil for immobilizing heavy metals (Cu, Pb, Zn and Ni). It was found that the toxicity level declined most significantly in the case of 20 g/kg biochar +20 g/kg bentonite. A low dose of persulfate (20 mmol/kg soil) was found to be suitable for oxidizing soil PBDEs and enhancing the bioavailability of PBDEs residue. Persulfate oxidation reduced the soil organic matter content, and caused dramatic decrease of bacterial density. Nevertheless, microbial activity and number recovered on the whole during 90 days of bioremediation. Finally, a degradation efficiency of 94.6% and a mineralization efficiency of 60.3% were obtained by the hybrid treatment scheme. The pyrosequencing analysis indicates that soil bacterial community changed obviously during the treatments, and there was an enrichment of PBDE-degrading populations during bioremediation relative to that of oxidized soil.
['Ma|Jing|J|', 'Zhang|Qi|Q|', 'Chen|Fu|F|', 'Zhu|Qianlin|Q|', 'Wang|Yifei|Y|', 'Liu|Gangjun|G|']
D001673:Biodegradation, Environmental D001682:Biological Availability D002606:Charcoal D059029:Electronic Waste D004785:Environmental Pollutants D052918:Environmental Restoration and Remediation D055768:Halogenated Diphenyl Ethers D019216:Metals, Heavy D010084:Oxidation-Reduction D059027:Recycling D012987:Soil D012989:Soil Pollutants
Immobilization Mineralization Bacterial community Dehydrogenase Passivator