Abstract
A bench scale system consisting of an up-flow packed bed bioreactor (UAPBR) made of polyurethane foam was used for the treatment and regeneration of aqueous solution of ferrous-NTA scrubbed with nitric oxide (NO). The biomass in the UAPBR was sequentially acclimatized under denitrifying and iron reducing conditions using ethanol as electron donor, after which nitric oxide (NO) gas was loaded continuously to the system by absorption. The system was investigated for different parameters viz. pH, removal efficiency of nitric oxide, biological reduction efficiency of FeIINTA-NO and COD utilization. The FeIINTA-NO reduction efficiency reached 87.8 % at a loading rate of 0.24 mmol L−1 h−1, while the scrubber efficiency reached more than 75 % with 250 ppm NO. Stover-Kincannon and a Plug-flow kinetic model based on Michaelis-Menten equation were used to describe the UAPBR performance with respect to FeIINTA-NO and COD removal. The Stover-Kincannon model was found capable of describing the FeIINTA-NO reduction (R m = 8.92 mM h−1 and K NO = 11.46 mM h−1) while plug-flow model provided better fit to the COD utilization (U m = 66.62 mg L−1 h−1, K COD = 7.28 mg L−1). Analyses for pH, FeIIINTA, ammonium, nitrite concentration, and FTIR analysis of the medium samples indicated degradation of NTA, which leads to ammonium and nitrite accumulation in the medium, and affect the regeneration process.
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The authors are thankful to the Director, CSIR-NEERI, for giving kind permission to publish this research work. The financial support extended by Department of Biotechnology (DBT) and Council of Scientific and Industrial Research (CSIR), Ministry of Science & Technology, Government of India for the execution of this research work is duly acknowledged.
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Chandrashekhar, B., Sahu, N., Tabassum, H. et al. Treatment of ferrous-NTA-based NO x scrubber solution by an up-flow anaerobic packed bed bioreactor. Appl Microbiol Biotechnol 99, 5281–5293 (2015). https://doi.org/10.1007/s00253-014-6372-5
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DOI: https://doi.org/10.1007/s00253-014-6372-5