title: Improvement in ammonium removal efficiency in wastewater treatment by mixed culture of Alcaligenes faecalis no. 4 and L1.
abstract: To improve ammonium removal efficiency in wastewater treatment, a mixed culture of Alcaligenes faecalis no. 4 and its mutant L1, both of which have heterotrophic nitrification and aerobic denitrification abilities, was performed. In a batch culture, no. 4 has a higher denitrification ability than L1, but its ammonium removal rate was lower. In a mixed continuous culture in the ammonium loading range of 750 to 3500 mg-N/l/d, the average ammonium removal rate and the average denitrification ratio were 61 mg-N/l/h and 31%, respectively. In the mixed culture, the ammonium removal rate was twofold higher than that in a single culture of no. 4, the rate was similar to that in a single culture of L1, and the denitrification ratio was very high compared with that in the single culture of L1.
authors.affiliation: Chemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan. hungsoo.joo@gmail.com
authors.forename: Hung-Soo
authors.initials: HS
authors.lastname: Joo
authors.forename: Mitsuyo
authors.initials: M
authors.lastname: Hirai
authors.forename: Makoto
authors.initials: M
authors.lastname: Shoda
mesh_terms: D042481:Alcaligenes faecalis / Q000145:classification* / Q000378:metabolism*; D019149:Bioreactors / Q000382:microbiology*; D018929:Cell Culture Techniques / Q000295:instrumentation / Q000379:methods*; D018920:Coculture Techniques / Q000295:instrumentation / Q000379:methods; D010865:Pilot Projects; D000644:Quaternary Ammonium Compounds / Q000302:isolation & purification / Q000378:metabolism*; D013045:Species Specificity; D014874:Water Pollutants, Chemical / Q000302:isolation & purification / Q000378:metabolism*; D018508:Water Purification / Q000295:instrumentation / Q000379:methods*
chemical_list: D000644:Quaternary Ammonium Compounds; D014874:Water Pollutants, Chemical