Biofilm characterization in removal of total chemical oxygen demand and nitrate from wastewater using draft tube spouted bed reactor

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 tota...

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Bibliographic Details
Published in:	Biotechnology letters Vol. 43; no. 10; pp. 2001 - 2009
Main Authors:	Joshi, Keshava, Navalgund, Lokeshwari, Rathod, Kirankumar, Shet, Vinayaka B., Srinikethan, Govindhan, Shet, Tejas, Rachitha, Umashankar, Anand, Aparna
Format:	Journal Article
Language:	English
Published:	Dordrecht Springer Netherlands 01-10-2021 Springer Nature B.V
Subjects:	Activated carbon Anoxic conditions Applied Microbiology Biochemistry Biofilms Biological Oxygen Demand Analysis Biomedical and Life Sciences Bioreactors Biotechnology Chemical oxygen demand Dilution Draft tubes Extracellular Polymeric Substance Matrix - chemistry Extracellular Polymeric Substance Matrix - metabolism Extracellular polymers Life Sciences Microbiology Microorganisms Mixed culture Municipal wastewater Nitrates Nitrates - isolation & purification Nitrates - metabolism Original Research Paper Oxygen Oxygen - metabolism Physical characteristics Reactors Reduction Spouted beds Waste Water - chemistry Wastewater Biofilm Granular activated carbon (GAC) Extracellular polymeric substances (EPS) Total chemical oxygen demand Draft tube spoutedbed reactor
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0141-5492 1573-6776
DOI:	10.1007/s10529-021-03181-3