Premium
Bioreduction of [Co(III)‐EDTA] − by Denitrifying Granular Sludge Biofilms
Author(s) -
Reddy Gangidi Kiran Kumar,
Nancharaiah Yarlagadda V.,
Mohan Tulasi V. Krishna
Publication year - 2016
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201500488
Subject(s) - denitrifying bacteria , bioremediation , chemistry , denitrification , cobalt , nitrate , nuclear chemistry , bioreactor , chelation , environmental chemistry , inorganic chemistry , contamination , nitrogen , organic chemistry , ecology , biology
Cobalt‐60 is a by‐product formed in the nuclear and defense‐related industries. Bioreduction of stable [Co(III)‐EDTA] − to the less stable [Co(II)‐EDTA] 2− constitutes a bioremediation approach. Bioreduction of [Co(III)‐EDTA] − by a denitrifying microbial community was studied. Denitrifying granular sludge cultivated in a bioreactor exhibited efficient [Co(III)‐EDTA] − reduction. Fed‐batch experiments showed repeated reduction of [Co(III)‐EDTA] − without loss of microbial activity. Bioreduction of [Co(III)‐EDTA] − was accelerated in the presence of anthraquinone‐2,6‐disulfonate. Simultaneous reduction of both nitrate and [Co(III)‐EDTA] − was observed, but denitrification was delayed in the presence of [Co(III)‐EDTA] − . Microbial reduction in the presence of excess nitrate and acceleration by an electron shuttle has practical implications in cobalt bioremediation.