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Studies in nitrification of municipal sewage in an upflow biofilter

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The upflow aerated biofilter with polyurethane foam cubes as the supporting medium was used for the investigation of nitrification studies on municipal sewage (secondary treated as well as untreated domestic sewage). In case of secondary treated sewage effluent, a synthetic composition of NH4 +-N and COD of each 50 mg/l was studied for a HRT variation of 24, 12, 8 and 6 hours. The ammonium removal efficiencies were found to be in the range of 98 to 100% with the steady-state effluent concentrations of NH4 +-N and NO2 -N in the range of 1–4 mg/l and 0.1–0.2 mg/l respectively. In case of domestic sewage system, nitrification studies along with suspended solids removal study was carried-out on untreated sewage for a HRT variation of 24, 12 and 6 hours. The ammonium removal efficiencies of 100% were observed for all the three HRT values at very high COD/NH4 +-N ratio of 15. The suspended solids removal efficiencies of 95 to 98% were observed with the average effluent suspended solids concentration of 5.9 to 15.9 mg/l. The experiments were conducted in non-backwash conditions of the biofilter. The study has revealed the best use of the upflow biofilter system for nitrification applications and suspended solids removal.

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Received: 17 August 1998

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Chandravathanam, S., Murthy, D. Studies in nitrification of municipal sewage in an upflow biofilter. Bioprocess Engineering 21, 117–122 (1999). https://doi.org/10.1007/s004490050650

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  • Sewage
  • Sewage System
  • Domestic Sewage
  • Municipal Sewage
  • Suspended Solid Concentration