Abstract
The present paper investigates the effect of dilution rate on the removal of total chemical oxygen demand and nitrate in the draft tube spouted bed reactor and morphological characteristics of biofilms formed by microorganisms of mixed culture on granular activated carbon (GAC). The nitrate and total chemical oxygen demand (COD) decreased from 97 to 81% and 95% to 87% respectively with increase in dilution rate from 0.6/h to 1.5/h showing that residence time in the reactor governs the nitrate and total COD reduction efficiency. Lower dilution rates favor higher production of biomass and extracellular polymeric substances (EPS). It was observed that the nitrate and total COD reduction rate increased with time along with simultaneous increase in EPS production. Thus, the performance of a reactor in terms of dynamic and steady-state biofilm characteristics associated with nitrate and organic reduction is a strong function of dilution rate. Hence these findings indicate that a draft tube spouted bed reactor is capable of simultaneously reducing total organics and nitrogen in industrial/municipal wastewater, as this reactor possesses two distinct regions aerobic and anoxic conditions which can prevail in different parts of a reactor.
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The authors wish to thank Vision Group on Science and Technology, Government of Karnataka for all the necessary support. Authors also thank Management, Principal and Department of Chemical Engineering, SDMCET for the support and encouragement to carry out the work at the department. We also thank the Department of Biotechnology Engineering, NMAMIT, Nitte and Department of Microbiology and Molecular Genetics, Hebrew University of Jerusalem, Israel for their kind support.
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Joshi, K., Navalgund, L., Rathod, K. et al. Biofilm characterization in removal of total chemical oxygen demand and nitrate from wastewater using draft tube spouted bed reactor. Biotechnol Lett 43, 2001–2009 (2021). https://doi.org/10.1007/s10529-021-03181-3
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DOI: https://doi.org/10.1007/s10529-021-03181-3