title: [Control for MUCT process operation using nitrate concentration in the secondary anoxic zone].
abstract: The feasibility of the control for MUCT process operation using nitrate concentration in the secondary anoxic zone were investigated by using simulative domestic sewage, in which the influent chemical oxygen demand concentration was stabilized at (290 +/- 10) mg x L(-1), the influent total nitrogen (TN) concentration was stabilized at (55 +/- 0.5) mg x L(-1), the influent total phosphorus (TP) concentration was stabilized at (7.0 +/- 0.5) mg x L(-1). The nitrate concentration in the secondary anoxic zone was changed to compare the effluent total nitrogen and total phosphorus concentration. The results indicated that, effluent total nitrogen and total phosphorus concentration significantly were affected by S(NO3-), controlling nitrate recirculation flow keeping SNO3- in 2.5 mg x L(-1) can realize MUCT process as the optimal control for nitrogen and phosphorus removal. The TP and NO3(-) -N mass balances were performed around each zone and settling tank based on the averaged TP and TN concentrations for each nitrate concentration in the secondary anoxic zone, which was indicated that S(NO3-) is a key factor determining the mass of phosphorus which is released in anaerobic zone, mass of phosphorus uptake in the secondary anoxic zone, and mass of NO3(-) -N which is denitrified in the first and secondary anoxic zone.
authors.affiliation: School of Municipal and Environmental Engineering, Jilin Architectural and Civil Engineering Institute, Changchun 130021, China. smile_gyb@sina.com
authors.forename: Xiao-Ling
authors.initials: XL
authors.lastname: Wang
authors.forename: Jun
authors.initials: J
authors.lastname: Yin
authors.forename: Shang
authors.initials: S
authors.lastname: Gao
mesh_terms: D000693:Anaerobiosis; D001421:Bacteria, Anaerobic / Q000502:physiology*; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors / Q000382:microbiology; D003198:Computer Simulation; D009566:Nitrates / Q000032:analysis*; D009584:Nitrogen / Q000032:analysis; D009930:Organic Chemicals / Q000737:chemistry; D010758:Phosphorus / Q000302:isolation & purification* / Q000378:metabolism; D012722:Sewage / Q000737:chemistry / Q000382:microbiology; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification* / Q000378:metabolism
chemical_list: D009566:Nitrates; D009930:Organic Chemicals; D012722:Sewage; D014874:Water Pollutants, Chemical; D010758:Phosphorus; D009584:Nitrogen