PMID- 16944208 OWN - NLM STAT- MEDLINE DCOM- 20070206 LR - 20131121 IS - 1615-7591 (Print) IS - 1615-7591 (Linking) VI - 29 IP - 5-6 DP - 2006 Dec TI - Effects of acetate and nitrite addition on fraction of denitrifying phosphate-accumulating organisms and nutrient removal efficiency in anaerobic/aerobic/anoxic process. PG - 305-13 AB - The effects of acetate and nitrite on the performance of sequencing batch reactors (SBRs) employing an anaerobic/aerobic/anoxic (AOA) process were investigated. Three types of SBR operations were used: sodium acetate addition at the start of anoxic condition for heterotrophic denitrification (Type 1); sodium acetate addition at the start of aerobic condition for anoxic phosphate removal by denitrifying phosphate-accumulating organisms (DNPAOs) (Type 2: conventional AOA process); and nitrite addition at the start of aerobic condition for inhibition of phosphate-accumulating organisms (PAOs) (Type 3). A track experiment shows that Type 2 led to the best performance of SBRs among the three types. An analysis by fluorescence in situ hybridization (FISH) revealed that nitrite addition decreased the ratio of PAOs with a decrease in phosphorus removal efficiency. The fraction of DNPAOs in Type 2 was the highest at 13%, indicating that Type 2 is suitable for the simultaneous nitrogen and phosphorus removal in the AOA process. FAU - Soejima, Koichi AU - Soejima K AD - Department of Chemical Engineering, Waseda University, 3-4-1 Ohkubo, Shinjuku-ku, Tokyo 169-8555, Japan. FAU - Oki, Kazuma AU - Oki K FAU - Terada, Akihiko AU - Terada A FAU - Tsuneda, Satoshi AU - Tsuneda S FAU - Hirata, Akira AU - Hirata A LA - eng PT - Journal Article DEP - 20060830 PL - Germany TA - Bioprocess Biosyst Eng JT - Bioprocess and biosystems engineering JID - 101088505 RN - 0 (Acetates) RN - 0 (Nitrites) RN - 0 (Phosphates) RN - N762921K75 (Nitrogen) SB - IM MH - Acetates/*administration & dosage MH - Bacteria, Aerobic/drug effects/*metabolism MH - Bacteria, Anaerobic/drug effects/*metabolism MH - Biodegradation, Environmental MH - Bioreactors/*microbiology MH - Computer Simulation MH - Kinetics MH - Models, Biological MH - Nitrites/*administration & dosage MH - Nitrogen/isolation & purification/*pharmacokinetics MH - Phosphates/*pharmacokinetics EDAT- 2006/09/01 09:00 MHDA- 2007/02/07 09:00 CRDT- 2006/09/01 09:00 PHST- 2006/07/19 00:00 [received] PHST- 2006/08/02 00:00 [accepted] PHST- 2006/09/01 09:00 [pubmed] PHST- 2007/02/07 09:00 [medline] PHST- 2006/09/01 09:00 [entrez] AID - 10.1007/s00449-006-0079-7 [doi] PST - ppublish SO - Bioprocess Biosyst Eng. 2006 Dec;29(5-6):305-13. doi: 10.1007/s00449-006-0079-7. Epub 2006 Aug 30.