Bioreduction based Bioremediation of Hexavalent Chromium Cr (VI) through Potential Indigenous Microbes

By: Das, Alok PrasadContributor(s): Mishra, Susmita [Supervisor] | Jena, Somesh [Supervisor] | Department of Chemical EngineeringMaterial type: TextTextLanguage: English Publisher: 2009Subject(s): Engineering and Technology | Chemical Engineering | Environmental Engineering | BioremidiationOnline resources: Click here to access online Dissertation note: Thesis (M.Tech (R))- National Institute of Technology, Rourkela Summary: Sukinda Valley, of Orissa, contains 97% of India’s chromite ore deposits and one of the prime open cast chromite ore mines in the world. (E NVIS Newsletter, 2007). Hexavalent chromium pollution in this area has caused a major health hazard affecting 2,600,000 people in this area (Blacksmith Institute report, 2007). Our investigation involved biological treatment of Cr (VI) without producing any byproduct. Bacterial cultures tolerating high concentrations of chromium were isolated from the soil sample collect ed from the chromite contaminated sites of Sukinda chromite mines and their bioaccumulation pr operties are investigated. Strains capable of growing at 300 mg/l of Cr (VI) are considered as ch romium resistant. The mentioned stain was capable of resisting Cr (VI) up to 500 mg/l. Its re sistance to different metals such as Ni, Zn, Cu, Cd and Fe were also investigated. The effects of di fferent operating parameters such as initial pH, temperature and initial Cr (VI) concentrations on bioaccumulation of Cr (VI) by enriched cultures were studied in a batch system. The experi mental investigation showed the maximum specific chromium uptake at pH 7 and temperature 30 0 C. With increasing initial Cr (VI) concentration from 5 mg/l to 50 mg/l showed increas e in Cr (VI) uptake. At about 50 mg l −1 initial Cr (VI) concentrations, uptake of the selec ted potential strain exceeded 98% within 12 hours of incubation. The bacterial isolate is ident ified by 16S rRNA sequencing as Brevebacterium casei . Data indicated that isolate culture can be utilize d to improve efficiency of biological treatment processes for effluents contai ning higher levels of Cr (VI)
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Thesis (M.Tech (R))- National Institute of Technology, Rourkela

Sukinda Valley, of Orissa, contains 97% of India’s
chromite ore deposits and one of the
prime open cast chromite ore mines in the world. (E
NVIS Newsletter, 2007). Hexavalent
chromium pollution in this area has caused a major
health hazard affecting 2,600,000 people in
this area (Blacksmith Institute report, 2007). Our
investigation involved biological treatment of
Cr (VI) without producing any byproduct. Bacterial
cultures tolerating high concentrations of
chromium were isolated from the soil sample collect
ed from the chromite contaminated sites of
Sukinda chromite mines and their bioaccumulation pr
operties are investigated. Strains capable of
growing at 300 mg/l of Cr (VI) are considered as ch
romium resistant. The mentioned stain was
capable of resisting Cr (VI) up to 500 mg/l. Its re
sistance to different metals such as Ni, Zn, Cu,
Cd and Fe were also investigated. The effects of di
fferent operating parameters such as initial
pH, temperature and initial Cr (VI) concentrations
on bioaccumulation of Cr (VI) by enriched
cultures were studied in a batch system. The experi
mental investigation showed the maximum
specific chromium uptake at pH 7 and temperature 30
0
C. With increasing initial Cr (VI)
concentration from 5 mg/l to 50 mg/l showed increas
e in Cr (VI) uptake. At about 50 mg l
−1
initial Cr (VI) concentrations, uptake of the selec
ted potential strain exceeded 98% within 12
hours of incubation. The bacterial isolate is ident
ified by 16S rRNA sequencing
as
Brevebacterium casei
.
Data indicated that isolate culture can be utilize
d to improve efficiency of
biological treatment processes for effluents contai
ning higher levels of Cr (VI)

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