title: Heterotrophic nitrification and aerobic denitrification of high-strength ammonium in anaerobically digested sludge by Alcaligenes faecalis strain No. 4.
abstract: Alcaligenes faecalis strain No. 4 which is capable of heterogeneous nitrification and aerobic denitrification, was used to remove high-strength ammonium (approximately 1 g NH4(+)-N/l) from digested sludge, the product of an anaerobic digestion reactor, in which methane was produced from excess municipal sewage sludge. Repeated batch operations were conducted at 20°C and 30°C for 550 h, using a jar fermentor. The removal ratios of high-strength ammonium reached 90-100% within 24 h, and the average ammonium removal rate was 2.9 kg-N/m(3)/day, more than 200 times higher than that in conventional nitrification-denitrification processes. During these operations, the cell density was maintained at 10(8)-10(9) cells of A. faecalis strain No. 4/ml. At 3% NaCl in the digested sludge, strain No. 4 exhibited an ammonium removal rate of 3 kg-N/m(3)/day.
authors.affiliation: Able Corporation, 7-9 Nishigoken-cho, Shinjuku-ku, Tokyo 216-0812, Japan. Electronic address: mshoda@res.titech.ac.jp.
authors.forename: Makoto
authors.initials: M
authors.lastname: Shoda
authors.affiliation: Able Corporation, 7-9 Nishigoken-cho, Shinjuku-ku, Tokyo 216-0812, Japan.
authors.forename: Yoichi
authors.initials: Y
authors.lastname: Ishikawa
mesh_terms: D000332:Aerobiosis; D042481:Alcaligenes faecalis / Q000378:metabolism*; D064751:Ammonium Compounds / Q000378:metabolism*; D001673:Biodegradation, Environmental; D058440:Denitrification; D005285:Fermentation; D052836:Heterotrophic Processes; D058465:Nitrification; D010100:Oxygen / Q000737:chemistry; D012722:Sewage / Q000737:chemistry / Q000382:microbiology
chemical_list: D064751:Ammonium Compounds; D012722:Sewage; D010100:Oxygen
keywords: Aerobic denitrification; Alcaligenes faecalis; Anaerobic digestion; Heterotrophic nitrification; High-strength ammonium