2004 Volume 48 Pages 1297-1302
Removal properties of inorganic nitrogen compounds in the water using a tidal bottom-mud, or muddy sediment, were investigated on the basis of experimental data. The nitrogen removal rate of muddy sediment was the highest of three type sediments: sandy, mud-sandy and muddy sediments. The nitrogen removal rate of sediment was largely dependent upon the denitrification activity near the RPD (Redox Potential Discontinuity) layer of sediment. However, the nitrogen removal rate decreased rapidly as the RPD layer approached to the anaerobic condition owing to the death of macro-benthos in the sediment. The relation between nitrogen removal rate, substrate (NH4+) concentration and temperature was almost expressed by an equation (2) which was obtained from the rate of ferment reaction.
