Publication Date:
2013-10-26
Description:
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. Removal of nitrogen compounds is vital to avoid eutrophication of receiving waters. A continuous denitrifying granular-sludge reactor is investigated using nitrite/nitrate as electron acceptors under continuous operation mode. It provides an effective technology for the removal of nitrite, nitrate, and mixture of both with much higher tolerance to their inhibitory effects compared to an activated sludge system.
Print ISSN:
0930-7516
Electronic ISSN:
1521-4125
Topics:
Chemistry and Pharmacology
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Process Engineering, Biotechnology, Nutrition Technology
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