title: Biotreatment of chromite ore processing residue by Pannonibacter phragmitetus BB.
abstract: 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.
authors: School of Metallurgical Science and Engineering, Central South University, Changsha, 410083, China.
authors: Yangyang
authors: Y
authors: Wang
authors: Zhihui
authors: Z
authors: Yang
authors: Bing
authors: B
authors: Peng
authors: Liyuan
authors: L
authors: Chai
authors: Baolin
authors: B
authors: Wu
authors: Ruiping
authors: R
authors: Wu
mesh_terms: D017608:Chromium Compounds / Q000378:metabolism* / Q000633:toxicity; D007220:Industrial Waste / Q000032:analysis; D008906:Mining; D041902:Rhodobacteraceae / Q000378:metabolism*; D018505:Waste Management / Q000379:methods
chemical_list: D017608:Chromium Compounds; D007220:Industrial Waste