TY - JOUR
T1 - Removal of hexavalent chromium by Trichoderma viride in an airlift bioreactor
AU - Morales-Barrera, Liliana
AU - Cristiani-Urbina, Eliseo
PY - 2006/12/6
Y1 - 2006/12/6
N2 - Trichoderma viride was batch-cultivated in a stirred tank bioreactor and in a concentric tube airlift bioreactor in order to determine its capacity to remove hexavalent chromium [Cr(VI)] from aqueous solutions. The agitation rate (120 rpm) used during the stirred tank bioreactor cultivation caused mycelial fragmentation, and had a negative effect on the cell growth and Cr(VI) removal. The physical damage inflicted by the agitation rate was, presumably, sufficient to cause fragmentation of mycelia and as a result, diminish Cr(VI) removal. Compared with stirred tanks, pneumatic bioreactors are considered more suitable systems for the cultivation of shear sensitive cells, and hence further studies were carried out in a concentric tube airlift bioreactor. In this type of reactor, the strain exhibited an extraordinary capability to remove high concentrations of the highly toxic and soluble hexavalent chromium. Therefore, the airlift bioreactor might represent an attractive technological alternative for the treatment of wastewaters containing high Cr(VI) concentrations, using the T. viride strain. To our knowledge, this is the first report on Cr(VI) removal by a microbial culture in a pneumatically agitated bioreactor.
AB - Trichoderma viride was batch-cultivated in a stirred tank bioreactor and in a concentric tube airlift bioreactor in order to determine its capacity to remove hexavalent chromium [Cr(VI)] from aqueous solutions. The agitation rate (120 rpm) used during the stirred tank bioreactor cultivation caused mycelial fragmentation, and had a negative effect on the cell growth and Cr(VI) removal. The physical damage inflicted by the agitation rate was, presumably, sufficient to cause fragmentation of mycelia and as a result, diminish Cr(VI) removal. Compared with stirred tanks, pneumatic bioreactors are considered more suitable systems for the cultivation of shear sensitive cells, and hence further studies were carried out in a concentric tube airlift bioreactor. In this type of reactor, the strain exhibited an extraordinary capability to remove high concentrations of the highly toxic and soluble hexavalent chromium. Therefore, the airlift bioreactor might represent an attractive technological alternative for the treatment of wastewaters containing high Cr(VI) concentrations, using the T. viride strain. To our knowledge, this is the first report on Cr(VI) removal by a microbial culture in a pneumatically agitated bioreactor.
KW - Airlift bioreactor
KW - Hexavalent chromium
KW - Trichoderma viride
UR - http://www.scopus.com/inward/record.url?scp=33750114825&partnerID=8YFLogxK
U2 - 10.1016/j.enzmictec.2005.10.044
DO - 10.1016/j.enzmictec.2005.10.044
M3 - Artículo
SN - 0141-0229
VL - 40
SP - 107
EP - 113
JO - Enzyme and Microbial Technology
JF - Enzyme and Microbial Technology
IS - 1
ER -