title: [Optimization and stability of denitrifying-phosphorus removal in a two-sludge system for treating wastewater with low carbon source].
abstract: Poly-beta-hydroxybutyrate (PHB) could be efficiently accumulated under optimized conditions in a sequencing batch moving bed biological reactor (SBMBBR), and a high performance of denitrifying phosphorus removal in the reactor could be achieved by coupling with a two-sludge system. Denitrifying phosphorus removal achieved the highest efficiency under influent COD of 200 mg/L, neutral pH and stirring speed of 80 r/min. The removal rates of phosphorus, NO3(-)-N and NO2(-)-N reached 83.7%, 81.4% and above 100%, respectively. High biomass in the SBMBBR is one of keys to improve the performance in removal of nitrogen and phosphorus. When the SBMBBR was conducted under a two-sludge system, stable and high performance was obtained. Removal rates of phosphorus and TN reached 89.2% and 84.5% under the influent COD of 140-170 mg/L and TN of 34-42 mg/L, respectively. In the process, phosphorus content in excess sludge approached to that in the feeding, and other path of phosphorus removal was not found.
authors: Key Laboratory of Industrial Ecology and Environmental Engineering, Ministry of Education, Department of Environmental Science and Technology, Dalian 116024, China. zhangyb@dlut.edu.cn
authors: Yao-Bin
authors: YB
authors: Zhang
authors: Ya-Bin
authors: YB
authors: Xing
authors: Si-Fei
authors: SF
authors: Qin
authors: Xie
authors: X
authors: Quan
authors: Shuo
authors: S
authors: Chen
mesh_terms: D000332:Aerobiosis; D000693:Anaerobiosis; D019149:Bioreactors / Q000382:microbiology; D002244:Carbon / Q000032:analysis / Q000302:isolation & purification*; D058440:Denitrification; D006885:Hydroxybutyrates / Q000737:chemistry; D009584:Nitrogen / Q000302:isolation & purification*; D010758:Phosphorus / Q000302:isolation & purification*; D011091:Polyesters / Q000737:chemistry; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000302:isolation & purification*; D000094122:Polyhydroxybutyrates
chemical_list: D002244:Carbon; D006885:Hydroxybutyrates; D009584:Nitrogen; D010758:Phosphorus; D011091:Polyesters; D014874:Water Pollutants, Chemical; C003182:poly-beta-hydroxybutyrate; D000094122:Polyhydroxybutyrates