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Wang Y.,Central South University | Wang Y.,Henan University | Peng B.,Central South University | Peng B.,Chinese National Engineering Research Center for and Treatment of Heavy Metal Pollution | And 8 more authors.
Applied Soil Ecology | Year: 2014

Pannonibacter phragmitetus BB was utilized to intensify the remediation of Cr(VI)-contaminated soil. The dynamics of indigenous bacterial community and the role of exogenous P. phragmitetus BB in the bioremediation process were investigated. Water soluble Cr(VI) and pH of the contaminated soil were 518.84 and 8.64mgkg-1, respectively. Cr(VI) in contaminated soil and leachate were completely reduced within two days. Restriction fragment length polymorphism (RFLP) revealed that the relative abundance of P. phragmitetus BB ranged from 35.5 to 74.8% during the bioremediation process, which was dominant in the soil bacterial community. Real-time quantitative PCR revealed that the population of P. phragmitetus BB in soil maintained relatively stable within the first 48h (about 2.0×109cells per gram soil), and the concentration of P. phragmitetus BB increased dramatically after the first 48h. The results suggest that P. phragmitetus BB can play a key role and get competitive advantages in the remediation Cr(VI) contaminated soil. © 2014.

Wang Y.,Central South University | Yang Z.,Central South University | Yang Z.,Chinese National Engineering Research Center for and Treatment of Heavy Metal Pollution | Peng B.,Central South University | And 5 more authors.
Environmental Science and Pollution Research | Year: 2013

Chromite ore processing residues (COPR) is the source of the Cr(VI) contamination in the environment. Pannonibacter phragmitetus BB was used to treat two different types of COPRs in this research. The water-soluble Cr(VI) of COPR A and B is 3,982.9 and 1,181.4 mg/kg, respectively. In the column biotreatment process, P. phragmitetus BB can reduce Cr(VI) in the leachate to an undetectable level at the flow rate of 1 and 2 ml/min. In the direct biotreatment process, Cr(VI) in the liquid supernatant of COPR A and B decreased from 265 and 200 mg/l to 145 and 40 mg/kg after 240 h of incubation. In one-step and two-step biotreatment processes, Cr(VI) in the liquid supernatant of both COPRs can be reduced to an undetectable level. The toxicity characteristic leaching procedure results indicate that the Cr(VI) concentration of treated COPR A (3.48 mg/l) is lower than the identification standards for hazardous wastes of China (5 mg/l) (GB 5085.6-2007). The information obtained in this study has significance for the application of P. phragmitetus BB to remediate COPR contamination. © 2013 Springer-Verlag Berlin Heidelberg.

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