Abstract
Chlorpyrifos (CP) is one of the most commonly applied insecticides for control of pests and insects. The inappropriate use of this kind of chemicals has caused heavy contamination of many terrestrial and aquatic ecosystems thus representing a great environmental and health risk. The main purpose of this work is to investigate novel microbial agents (Pseudomonas stutzeri and the previously obtained consortium LB2) with the ability to degrade CP from polluted effluents. This goal was achieved by operating at different lab scales (flask and bioreactor) and operation modes (batch and fed-batch). Very low degradation and biomass levels were detected in cultures performed with the consortium LB2. In contrast, near complete CP degradation was reached by P. stutzeri at the optimal conditions in less than 1 month, showing a depletion rate of 0.054 h−1. The scale-up at bench scale stirred tank bioreactor allowed improving the specific degradation rate in ten folds and total CP degradation was obtained after 2 days. Moreover, biomass and biodegradation profiles were modelled to reach a better characterization of the bioremediation process.
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Acknowledgments
This research was funded by Spanish Ministry of Science and Innovation (Project CTQ2008-0359). The authors are grateful to Xunta de Galicia for financial support of Francisco Deive under the Parga Pondal program.
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Moscoso, F., Teijiz, I., Deive, F.J. et al. Approaching chlorpyrifos bioelimination at bench scale bioreactor. Bioprocess Biosyst Eng 36, 1303–1309 (2013). https://doi.org/10.1007/s00449-012-0876-0
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DOI: https://doi.org/10.1007/s00449-012-0876-0