J. Semon et al., BIOLOGICAL UPFLOW FLUIDIZED-BED DENITRIFICATION REACTOR DEMONSTRATIONPROJECT STAMFORD, CT, USA, Water science and technology, 36(1), 1997, pp. 139-146
Citations number
5
Categorie Soggetti
Water Resources","Environmental Sciences","Engineering, Civil
The discharge of nitrogen in wastewater treatment plant effluent has b
een identified as a receiving water quality issue throughout the Unite
d States and in the European Community. Regulatory agencies are evalua
ting discharge limits for total nitrogen (TN) as low as 3 to 5 mg/l].
To attain these limits at treatment plants with little or no space for
expansion, technologies which can remove large quantities of nitrogen
with relatively small space requirements are required. Biological upf
low fluidized bed (BFB) technology appears to be well suited to these
regions. This paper describes the results of a demonstration project u
sing a fluidized bed reactor. The reactor was operated at a flow rate
of 15 l/s and an average daily loading of 1843 kg NO3/1000 m(3)/d and
maximum loadings of 6407 kg NO3/1000 m(3)/d. At steady-state condition
s, effluent total nitrogen concentrations averaged 2.5 mg/l over a tem
perature range of 11 to 25 degrees C. At high nitrate loading rates, e
ffluent total nitrogen concentrations averaged 4.1 mg/l. Approximately
3 mg of methanol per mg of influent nitrate was used as a carbon sour
ce. Reactor empty bed contact time averaged 5.7 minutes. (C) 1997 IAWQ
. Published by Elsevier Science Ltd.