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Nitrate and Nitrite Removal Using a Continuous Heterotrophic Denitrifying Granular Sludge Bioreactor
Author(s) -
Hosseini M.,
Sahraei E.,
Khoshfetrat A. B.,
Ebrahimi S.
Publication year - 2013
Publication title -
chemical engineering and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.403
H-Index - 81
eISSN - 1521-4125
pISSN - 0930-7516
DOI - 10.1002/ceat.201300254
Subject(s) - nitrite , denitrifying bacteria , nitrate , chemistry , denitrification , bioreactor , environmental chemistry , electron acceptor , environmental engineering , nitrogen , biochemistry , environmental science , organic chemistry
Abstract The denitrification potential of a continuous denitrifying granular‐sludge bioreactor for concentrated nitrate/nitrite wastes was investigated. Granules were cultivated using nitrite as sole electron acceptor. Complete denitrification could be achieved at nitrite, nitrate, and nitrate‐nitrite mixture (50:50) loading rates up to 2.7, 3 and 3 g N L –1 d –1 , respectively. The maximum nitrite and nitrate reduction capacities were limited by the biomass concentration. Removal of nitrate and nitrite was studied with constant biomass concentration at different pH values. A lower pH value resulted in a considerable increase of inhibitory effects of both nitrite and nitrate whereby nitrate exhibited the more significant impact.