title: Comparison of sequentially combined carbon with sole carbon in denitrification and biological phosphorus removal.
abstract: The sequentially combined carbon (SCC) of methanol and acetic acid was used for the biological nutrient removal (BNR). Its BNR performance was compared with methanol or acetic acid as a sole carbon substrate. Compared to the sole carbon substrate, the use of SCC demonstrated the highest overall TIN removal of 98.3% at a COD ratio of 30 mg COD/l of methanol/50 mg CDO/l of acetic acid. Furthermore, denitrification was more enhanced when methanol was used as one of the SCC, rather than as a sole carbon source. Complete phosphorus removal was accomplished with a non-detectable o-P concentration when SCC was added. This research also showed that aerobic denitrifiers appear to prefer acetic acid to methanol, and the amount of poly-beta-hydroxybutyrate (PHB) stored by P accumulating organisms (PAOs) using acetic acid in the anoxic zone could be another important factor in improving the aerobic denitrification. The SCC was a very favorable carbon source for the aerobic denitrification since acetic acid was utilized more efficiently for P-release in accordance with increase of PHB stored in the cell of PAOs by removing nitrogen first using methanol.
authors.affiliation: Environment and Process Division, Korea Institute of Science and Technology, P.O. Box 131 Cheongryang Seoul, 130-630 Korea. escho1226@hotmail.com
authors.forename: E S
authors.initials: ES
authors.lastname: Cho
authors.forename: K H
authors.initials: KH
authors.lastname: Ahn
authors.forename: A H
authors.initials: AH
authors.lastname: Molof
mesh_terms: D019342:Acetic Acid / Q000737:chemistry; D001420:Bacteria, Aerobic; D019149:Bioreactors; D002244:Carbon / Q000737:chemistry*; D000432:Methanol / Q000737:chemistry; D009584:Nitrogen / Q000302:isolation & purification* / Q000378:metabolism*; D010758:Phosphorus / Q000302:isolation & purification* / Q000378:metabolism*; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D010758:Phosphorus; D002244:Carbon; D009584:Nitrogen; D019342:Acetic Acid; D000432:Methanol