naa a22 4500 510821308 CHVBK 20180411083533.0 cr unu---uuuuu 180411e20130201xx s 000 0 eng 10.1007/s11814-012-0142-9 doi (NATIONALLICENCE)springer-10.1007/s11814-012-0142-9 Recovery of nickel from chromite overburden, Sukinda using Aspergillus niger supplemented with manganese [Elektronische Daten] [Sunil Behera, Prangya Panda, Sandeep Saini, Nilotpala Pradhan, Lala Sukla, Barada Mishra] Oxalic acid is a prominent metabolite secreted by several fungi under specific conditions, which acts as a metal chelating agent. Amongst different fungal species, Aspergillus niger is favored as the best option for microbial production of oxalic acid. The present study deals with the oxalic acid over production by A. niger in response to manganese supplement to its growth medium, which in turn improves the recovery of nickel from pre-treated chromite overburden(COB) during fungal bioleaching. The metabolic pathway in oxalate bio-synthesis by A. niger involves one prominent cytoplasmic enzyme oxaloacetate acetylhydrolase (OAH), which catalyzes the breakdown of oxaloacetate metabolic intermediate to oxalate and acetate. Oxalic acid production was increased due to supplement of manganese to the culture medium of the A. niger. Manganese acts as cofactor for OAH enzyme; further, it enhances the catalytic activity of OAH to produce more oxalate. With oxalic acid production by A. niger, nickel recovery from pre-treated COB was improved. During the study, a maximum of nickel recovery was achieved up to 38.6% from pre-treated COB by adding 80 ppm of manganese to the culture media, whereas 24.0% of nickel was recovered without supplement of manganese (experiments were performed at 30 °C and the COB pulp density 2% w/v). Korean Institute of Chemical Engineers, Seoul, Korea, 2012 Aspergillus niger nationallicence Chromite Overburden nationallicence Manganese nationallicence Nickel nationallicence Oxalic Acid nationallicence Behera Sunil Institute of Minerals & Materials Technology (CSIR), 751 013, Bhubeneswar, India aut Panda Prangya Institute of Minerals & Materials Technology (CSIR), 751 013, Bhubeneswar, India aut Saini Sandeep Utkal University, 751 004, Bhubaneswar, India aut Pradhan Nilotpala Institute of Minerals & Materials Technology (CSIR), 751 013, Bhubeneswar, India aut Sukla Lala Institute of Minerals & Materials Technology (CSIR), 751 013, Bhubeneswar, India aut Mishra Barada Institute of Minerals & Materials Technology (CSIR), 751 013, Bhubeneswar, India aut Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/2(2013-02-01), 392-399 0256-1115 30:2<392 2013 30 11814 https://doi.org/10.1007/s11814-012-0142-9 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11814-012-0142-9 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Behera Sunil Institute of Minerals & Materials Technology (CSIR), 751 013, Bhubeneswar, India aut NATIONALLICENCE 700 1- Panda Prangya Institute of Minerals & Materials Technology (CSIR), 751 013, Bhubeneswar, India aut NATIONALLICENCE 700 1- Saini Sandeep Utkal University, 751 004, Bhubaneswar, India aut NATIONALLICENCE 700 1- Pradhan Nilotpala Institute of Minerals & Materials Technology (CSIR), 751 013, Bhubeneswar, India aut NATIONALLICENCE 700 1- Sukla Lala Institute of Minerals & Materials Technology (CSIR), 751 013, Bhubeneswar, India aut NATIONALLICENCE 700 1- Mishra Barada Institute of Minerals & Materials Technology (CSIR), 751 013, Bhubeneswar, India aut NATIONALLICENCE 773 0- Korean Journal of Chemical Engineering Springer US; http://www.springer-ny.com 30/2(2013-02-01), 392-399 0256-1115 30:2<392 2013 30 11814 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer