title: The effect of carbon as an energy source for biological denitrification through Pseudomonas stutzeri.
abstract: The biological denitrification processes possess many advantages in comparison to other denitrification processes. The present study was undertaken to observe the effect of quantity of carbon on biological denitrification with Pseudomonas stutzeri at different C/N ratios. The results obtained in the present investigations show that the pH and alkalinity of the effluent increased with increase in C/N ratio due to alkalinity generated during denitrification. The COD of the influent was increased with increase in C/N ratio. The effluent COD was nil under pseudo-steady state condition up to the C/N ratio of 2.5. Above this C/N ratio, the organics started entering in the treated water. The maximum feasible economic reduction of NO(3-)N from 51.6 mg/l to 1.2 mg/l occurred at C/N ratio of 2.5 and the obtained concentration of NO(3-)N was found to be lower than the tolerance limit (10 mg/l) prescribed by the WHO. The present work provides a feasible approach for a more efficient NO(3-)N removal process.
authors.affiliation: Department of Chemistry, University of Rajasthan, Jaipur-302 004, India.
authors.forename: Hari Singh
authors.initials: HS
authors.lastname: Shivran
authors.forename: S
authors.initials: S
authors.lastname: Kumar
authors.forename: Dinesh
authors.initials: D
authors.lastname: Kumar
authors.forename: R V
authors.initials: RV
authors.lastname: Singh
mesh_terms: D001673:Biodegradation, Environmental; D002244:Carbon / Q000378:metabolism*; D009566:Nitrates / Q000032:analysis / Q000378:metabolism*; D009584:Nitrogen / Q000378:metabolism*; D044223:Pseudomonas stutzeri / Q000254:growth & development / Q000378:metabolism*; D019346:Sodium Acetate / Q000378:metabolism; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000378:metabolism*; D018508:Water Purification
chemical_list: D009566:Nitrates; D014874:Water Pollutants, Chemical; D019346:Sodium Acetate; D002244:Carbon; D009584:Nitrogen