(1) Chemical Resources Laboratory, Tokyo Institute of Technology, Midori-ku, 226-8503 Yokohama, Japan
Abstract:
Alcaligenes faecalis sp. No. 4, that has the ability of heterotrophic nitrification and aerobic denitrification in high-strength ammonium at about 1200 mg-N/l, converted about one-half of removed NH
4+-N to intracellular nitrogen and nitrified only 3% of the removed NH4+. From the nitrogen balance, 40–50% of removed NH4+-N was estimated to be denitrified. Production of N2 was confirmed by GC-MS and 90% of denitrified products was N2.
The maximum ammonium removal rate, 29 mg-N/l h and its denitrification rate in aerated batch experiments, were 5–40 times higher than those of other bacteria with the same ability.