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REMEDIATION OF PBDES-METAL CO-CONTAMINATED SOIL BY THE COMBINATION OF METAL STABILIZATION, PERSULFATE OXIDATION AND BIOREMEDIATION
Ma, J., Q. Zhang, F. Chen, Q. Zhu, Y. Wang, and G. Liu.
Chemosphere 252:126538(2020)
Filed Under: Research
Filed Under: Research
Laboratory experiments were performed to investigate the efficiency of simultaneous metal stabilization, persulfate oxidation, and bioremediation to remediate PBDEs and toxic metals from soil polluted from electronic waste recycling. Biochar and bentonite were applied to the soil to immobilize Cu, Pb, Zn, and Ni. The toxicity level declined most significantly when 20 g/kg biochar +20 g/kg bentonite were applied. A dose of 20 mmol persulfate/kg soil was found to be suitable to oxidize soil PBDEs and enhance the bioavailability of PBDEs residue. Persulfate oxidation reduced soil organic matter content and dramatically decreased bacterial density. Nevertheless, microbial activity and number recovered during 90 days of bioremediation. The hybrid treatment scheme obtained a degradation efficiency of 94.6% and a mineralization efficiency of 60.3%. Soil bacterial community changed during the treatments, and there was an enrichment of PBDE-degrading populations during bioremediation relative to that of oxidized soil.
Chemosphere 252:126538(2020)
Filed Under: Research
Filed Under: Research
Laboratory experiments were performed to investigate the efficiency of simultaneous metal stabilization, persulfate oxidation, and bioremediation to remediate PBDEs and toxic metals from soil polluted from electronic waste recycling. Biochar and bentonite were applied to the soil to immobilize Cu, Pb, Zn, and Ni. The toxicity level declined most significantly when 20 g/kg biochar +20 g/kg bentonite were applied. A dose of 20 mmol persulfate/kg soil was found to be suitable to oxidize soil PBDEs and enhance the bioavailability of PBDEs residue. Persulfate oxidation reduced soil organic matter content and dramatically decreased bacterial density. Nevertheless, microbial activity and number recovered during 90 days of bioremediation. The hybrid treatment scheme obtained a degradation efficiency of 94.6% and a mineralization efficiency of 60.3%. Soil bacterial community changed during the treatments, and there was an enrichment of PBDE-degrading populations during bioremediation relative to that of oxidized soil.
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