Title: Nitrification of centrate from dewatering of anaerobically digested sludge

Authors: M. Kawsar Ali, C.G. Marquez, J. Fillos, V. Diyamandoglu, L.A. Carrio

Addresses: Department of Civil Engineering, City College of the City University of New York, New York, NY 10031, USA. ' Department of Civil Engineering, City College of the City University of New York, New York, NY 10031, USA. ' Department of Civil Engineering, City College of the City University of New York, New York, NY 10031, USA. ' Department of Civil Engineering, City College of the City University of New York, New York, NY 10031, USA. ' Process Development Section, New York City Department of Environmental Protection, New York, USA

Abstract: Nitrification of anaerobically digested sludge centrate was studied in bench-scale suspended growth and fixed film enhanced suspended growth systems at temperatures of 10.5-28.5°C and pH values of 6.0-9.1. Nitrification followed zero-order kinetics in both systems, and ammonia removals in excess of 99% were observed. The temperature dependency of the suspended growth nitrification rate observed under not fully acclimated biomass conditions at pH between 6.8 and 8.5, was expressed as k_T = k₂₀θ^T-20where k₂₀ and θ were found to be 0.34 mg NH₃-N/MLVSS-d and 1.033, respectively. The nitrification rate in the fixed film enhanced suspended growth system involving styrofoam pads ranged from 0.11 to 0.13 mg NH₃-N/mg MLVSS-d at temperatures of 21.5-25°C and pH values of 7.8-8.6. The process contained suspended solids in the range of 10-20 mg/l.

Keywords: centrate; fixed-film enhanced suspended growth; nitrification; sequencing batch reactors; SBR; dewatering; anaerobically digested sludge; zero-order kinetics; ammonia removal; biomass.

DOI: 10.1504/IJEP.1998.028255

International Journal of Environment and Pollution, 1998 Vol.9 No.4, pp.421 - 431

Published online: 15 Sep 2009 *

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