title: [Addition of propionic acid on simultaneous biological phosphorus and nitrogen removal in anaerobic-low dissolved oxygen system].
abstract: Two lab-scale sequencing batch reactors (SBRs) were operated under conditions of anaerobic-low dissolved oxygen (DO) (0.15 - 0.45 mg x L(-1)), and the influences of addition of propionic acid on simultaneous biological nitrogen and phosphorus removal system were investigated. The results showed that the simultaneous nitrification, denitrification and phosphorus removal (SNDPR) occurred in both SBR1 (acetic and propionic acid as mixed carbon source with the carbon molar ratio of 1.5/1) and SBR2 (acetic acid as sole carbon source), and ammonia was completely oxidized during the aerobic period without substantive nitrite accumulation. Compared with SBR2, SBR1 showed less anaerobic phosphorus release and more polyhydroxyvalerate (PHV) synthesis, but the aerobic end phosphorus and nitrate concentrations were lower. The total nitrogen and phosphorus removal efficiencies were higher in SBR1 (68% and 95%, respectively) than in SBR2 (51% and 92%, respectively) suggesting that the addition of propionic acid to SNDPR system would be helpful.
authors.affiliation: State Key Laboratory of Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China. lihongjing980824@yahoo.com
authors.forename: Hong-Jing
authors.initials: HJ
authors.lastname: Li
authors.forename: Yin-Guang
authors.initials: YG
authors.lastname: Chen
authors.forename: Guo-Wei
authors.initials: GW
authors.lastname: Gu
mesh_terms: D000693:Anaerobiosis; D009584:Nitrogen / Q000737:chemistry / Q000378:metabolism*; D010100:Oxygen / Q000032:analysis* / Q000737:chemistry; D010758:Phosphorus / Q000737:chemistry / Q000378:metabolism*; D011422:Propionates / Q000737:chemistry*; D012995:Solubility; D014874:Water Pollutants, Chemical / Q000737:chemistry / Q000378:metabolism*; D018508:Water Purification
chemical_list: D011422:Propionates; D014874:Water Pollutants, Chemical; D010758:Phosphorus; C029658:propionic acid; D009584:Nitrogen; D010100:Oxygen